Patent Description:
In recent years, technology has been developed which allows an operator to drill a primary vertical well, and then continue drilling an angled lateral borehole off of that vertical well at a chosen depth. Generally, the vertical, or "parent" wellbore is first drilled and then supported with strings of casing. The strings of casing are cemented into the formation by the extrusion of cement into the annular regions between the strings of casing and the surrounding formation. The combination of cement and casing strengthens the wellbore and facilitates the isolation of certain areas of the formation behind the casing for the production of hydrocarbons.

A lateral wellbore can be formed off of a parent wellbore. Forming lateral or "sidetrack" wellbore, a tool known as a whipstock is positioned in the parent wellbore at the depth where deflection is desired, typically at or above one or more producing zones. The whipstock is used to divert milling bits into a side of the parent wellbore to create a pilot borehole in the parent wellbore. Thereafter, a drill bit is run into the parent wellbore. The drill bit is deflected against the whipstock, and urged through the pilot borehole. From there, the drill bit contacts the rock formation in order to form the new lateral hole in a desired direction. This process is sometimes referred to as sidetrack drilling.

When forming the lateral wellbore through the parent wellbore, an anchor is first set in the parent wellbore at a desired depth. The anchor typically includes slips and seals. The anchor tool acts as a fixed body against which tools above it may be urged to activate different tool functions. The anchor tool typically has a key or other orientation-indicating member.

A whipstock is next run into the wellbore. The whipstock has a body that lands into or onto the anchor. A stinger is located at the bottom of the whipstock which engages the anchor device. At a top end of the body, the whipstock includes a deflection portion having a concave face. The stinger at the bottom of the whipstock body allows the concave face of the whipstock to be properly oriented so as to direct the milling operation. The deflection portion receives the milling bits as they are urged downhole. In this way, the respective milling bits are directed against the surrounding wellbore for forming the pilot borehole.

In order to form the pilot borehole, a milling bit, or "mill," is placed at the end of a string of drill pipe or other working string. In some milling operations, a series of mills is run into the hole. First, a starting mill is run into the hole. Rotation of the string with the starting mill rotates the mill, causing a portion of the wellbore to be removed. This mill is followed by other mills, which complete the pilot borehole or extend the lateral wellbore.

In some instances, the casing wall of the parent wellbore has a contaminated surface that may affect the engagement of the anchor with the casing wall or the seal formed by the packer with the casing wall. For example, the contact surface of the wall can have a thin sheath of cement left behind from a cementing operation or a layer of drilling mud used to displace the cement. Other sources of contaminants include the cuttings from the formation, debris from drilling out the wiper plug and the remaining cement in the casing. In deviated or horizontal wells, any remaining cuttings may settle on the low side of the wellbore when the circulation is stopped. The cuttings may become embedded in the dehydrated solids on the casing wall. <CIT> discloses a combined window milling and cleaning tool whereby cleaning occurs after milling has taken place thereby removing burrs caused by the milling operation.

There is a need, therefore, for a whipstock and anchor assembly to include a cleaning tool to clean the wall of the wellbore. There is also a need for a bottom hole assembly equipped with a cleaning tool to clean the wall of the wellbore in a single trip.

According to an aspect of the present invention, a bottom hole assembly for use in a wellbore includes a whipstock; a downhole tool; and a cleaning tool coupled to the downhole tool, the cleaning tool or the downhole tool coupled to the whipstock, the cleaning element having: a body; and a plurality of cleaning elements disposed at least partially in the body and being moveable to an extended position, the cleaning elements in the extended position being configured to clean a portion of a wall of the wellbore, wherein the downhole tool is configured to engage the cleaned portion of the wall.

According to another aspect of the present invention, a method of positioning a bottom hole assembly in a wellbore includes lowering the bottom hole assembly into the wellbore, the bottom hole assembly having a whipstock, a downhole tool, and a cleaning tool, the cleaning tool having a plurality of cleaning element; moving the cleaning elements to an extended position on the cleaning tool; cleaning at least a portion of a wall of the wellbore using the cleaning elements in the extended position on the cleaning tool; and activating the downhole tool to engage the cleaned portion of the wall.

So that the manner in which the above recited features of the present disclosure are attained and can be understood in detail, a more particular description of the disclosure, briefly summarized above, may be had by reference to the drawings that follow. The drawings illustrate only selected embodiments of this disclosure, and are not to be considered limiting of its scope.

<FIG> illustrates an exemplary embodiment of a bottom hole assembly <NUM>. The BHA <NUM> includes a whipstock <NUM> coupled to one or more downhole tools. In one embodiment, the BHA <NUM> includes downhole tools such as a packer <NUM>, an anchor <NUM>, and a cleaning tool <NUM>. The BHA <NUM> may include an optional mill releasably attached to the whipstock <NUM>. The BHA with the cleaning tool <NUM> can be run-in in a single trip. In one embodiment, the BHA <NUM> can clean the wellbore, set the anchor, set the packer, and form a sidetrack in the wellbore in a single trip. It is contemplated the downhole tools can be arranged in any suitable order. As shown, the packer <NUM>, the anchor <NUM>, and the cleaning tool <NUM> are sequentially attached below the whipstock <NUM>. In another embodiment, the BHA <NUM> includes a cleaning tool <NUM> attached below the whipstock <NUM>, and the packer <NUM> and the anchor <NUM> are sequentially attached below the cleaning tool <NUM>, as shown in <FIG>. In another embodiment, the BHA includes a cleaning tool attached to an anchor assembly, either with or without a packer. The whipstock can be connected to the anchor assembly in a separate trip.

<FIG> is a perspective view of one embodiment of a sidetrack assembly <NUM> for forming at least a portion of a lateral wellbore in a parent wellbore. <FIG> is a cross-sectional view of the sidetrack assembly <NUM> of <FIG>. <FIG> are enlarged partial views of the sidetrack assembly <NUM> of <FIG>. The sidetrack assembly <NUM> is suitable for use as a component of the BHA <NUM> of <FIG>.

In this embodiment, the sidetrack assembly <NUM> includes a drilling assembly releasably attached to a whipstock <NUM>. The drilling assembly may be a mill <NUM> or a drill bit. The mill <NUM> is attached to the upper end of the whipstock <NUM>. The lower end of the whipstock <NUM> is attached to an adapter <NUM> for connection to one or more downhole tools <NUM>, such as an anchor, a packer, a fishing tool, a cement basket, a cleaning tool, and combinations thereof. In another embodiment, the adapter <NUM> is integrated with the whipstock <NUM>. In another embodiment, the adapter <NUM> is integrated with the downhole tool <NUM>.

The whipstock <NUM> includes a concave, inclined surface <NUM> for guiding the path of the mill <NUM>. In one embodiment, the concave surface <NUM> at the upper portion of the whipstock <NUM> is an inclined cut out, as shown in <FIG> and <FIG>. The inclined cut out may be achieved using a concave cut on a wall of the whipstock <NUM>. The inclined cut out may begin at the upper end of the whipstock <NUM> and may extend toward the lower end. In one embodiment, the inclined cut out formed on the upper portion of the whipstock <NUM> is used as a concave ramp to guide the movement of the mill <NUM> and set the mill's angle of attack to form a portion of the lateral wellbore, e.g., to form the pilot borehole. In one embodiment, the inclined cut out is between about <NUM> degrees and <NUM> degrees; preferably between <NUM> degrees and <NUM> degrees; and more preferably between about <NUM> degrees and <NUM> degrees.

During run-in, the mill <NUM> is attached to the upper end of the whipstock <NUM> using a shearable member <NUM> such as a shear screw, as shown in <FIG>. The upper end of the whipstock <NUM> includes an attachment section <NUM> having flat or substantially flat upper surface. In one example, the upper surface of the attachment section <NUM> has an incline that is less than <NUM> degrees, less than <NUM> degree, or less than <NUM> degrees. In one embodiment, the attachment section <NUM> is attached to the whipstock <NUM>, as shown in <FIG> and <FIG>. In another embodiment, the attachment section <NUM> is integrated with the whipstock <NUM>. For example, the attachment section <NUM> and the whipstock <NUM> are formed as a single unit. In some embodiments, the concave, inclined surface <NUM> of the whipstock <NUM> begins on at least a portion of the attachment section <NUM>.

As shown in the perspective view of <FIG>, a lug <NUM> extends above a top surface of the attachment section <NUM>. In another embodiment, a plurality of lugs is formed above the top surface of the attachment section <NUM>. Two blade slots <NUM>, <NUM> are formed in the attachment section <NUM> for receiving two blades of the mill <NUM>. In another embodiment, the blade slots extend to a portion of the concave, inclined surface <NUM>. In another embodiment, a single blade slot is used to receive a blade of the mill <NUM>. A hole <NUM> is formed through the attachment section <NUM> to receive the shearable member <NUM>. In this example, the hole <NUM> is located between the two blade slots <NUM>, <NUM>.

<FIG> is a cross-sectional view of the mill <NUM> of <FIG>. <FIG> is a front view of the mill <NUM> of <FIG>. The mill <NUM> includes a body <NUM> having a bore <NUM> extending therethrough. The bore <NUM> includes an inlet 155A, an angled passage 155B, and an offset passage 155C. The angled portion 155B fluidly connects the inlet 155A to the offset passage 155C. The central axis of the offset passage 155C is located above the central axis of the inlet 155A when the mill <NUM> is attached to the attachment section <NUM>. The angled portion 155B may be angled between <NUM> degree and <NUM> degrees. In one example, the angled portion 155B has an inner diameter that is larger than the inner diameter of the offset passage 155C. One or more sealing members <NUM>, such as o-rings, are disposed in the offset passage 155C near the outlet. In this embodiment, two sealing members <NUM> are provided. A slot <NUM> is formed on a bottom portion of the body <NUM> for engaging the shearable member <NUM>. A lug <NUM> extends out of the bottom of the mill <NUM>, as shown in <FIG>. The lug <NUM> of the mill <NUM> is configured to engage the lug <NUM> of the attachment section <NUM>. In one embodiment, the axial force can be transferred from one lug <NUM>, <NUM> to the other lug <NUM>, <NUM>. For example, the mill <NUM> can apply a downward force on the whipstock <NUM> via the lugs <NUM>, <NUM>. The lugs <NUM>, <NUM> allow the downward force applied to be greater than the force required to shear the shearable member <NUM>. In one embodiment, a clearance exists between the shearable member <NUM> and the hole <NUM> in the whipstock <NUM> to reduce the amount of axial force transfer between the mill <NUM> and the whipstock <NUM>. For example, the hole <NUM> is sized so that a minimal amount, such as less than <NUM>%, of the downward force is transferred through the shearable member <NUM>, while most of the downward force is transferred through the lugs <NUM>, <NUM>.

The mill <NUM> is equipped with two or more blades <NUM>, such as two, four, five, six, and eight blades. As shown in <FIG> and <FIG>, the mill <NUM> includes six blades <NUM> arranged circumferentially on the mill <NUM>. The blades <NUM> are disposed at various angles to accommodate position of the offset passage 155C. A plurality of cutting inserts <NUM> may be attached to a cutting surface of the blades <NUM>. Two of the blades <NUM>, <NUM> are disposed in the blades slots <NUM>, <NUM> respectively, of the attachment section <NUM>. While two blades are shown, it is contemplated that one or three blades are disposed in the blade slots of the whipstock <NUM>. The blades <NUM>, <NUM> in the slots <NUM>, <NUM> can serve as torque keys to transfer torque from the mill <NUM> to the whipstock <NUM>. As the mill <NUM> is rotated, the cutting inserts <NUM> of the blades <NUM>, <NUM> will engage the sidewall of the slot <NUM>, <NUM> to transfer torque to the whipstock <NUM>. In one embodiment, the clearance between the blade <NUM> and the sidewall of the slot <NUM> is smaller than the clearance between the blade <NUM> and the sidewall of the slot <NUM>. In this respect, when rotated, the blade <NUM> will engage the sidewall of the slot <NUM> before the blade <NUM> will engage the sidewall of the slot <NUM>. In one embodiment, a clearance exists between the shearable member <NUM> and the hole <NUM> in the attachment section <NUM> to reduce the amount of torque transfer. For example, the hole <NUM> is sized such that a minimal amount, such as less than <NUM>%, of the applied torque is transferred through the shearable member <NUM>. In one embodiment, to facilitate the positioning of the blades <NUM>, <NUM> in the respective slots <NUM>, <NUM>, grooves <NUM>, <NUM> are formed in the mill body <NUM> for receiving the blades <NUM>, <NUM> as shown in <FIG>. The grooves <NUM>, <NUM> facilitate proper attachment of the blades <NUM>, <NUM> to the mill <NUM>, which ensures the blades <NUM>, <NUM> align with the slots <NUM>, <NUM> during assembly. In one embodiment, the blades <NUM>, <NUM> are in direct contact with the slots <NUM>, <NUM>. In another embodiment, an intermediate structure, such as a liner, is disposed in the slots <NUM>, <NUM> and in contact with the blades <NUM>, <NUM>. The intermediate structure may be used to control the clearance between the blades and the slots.

In one embodiment, the sidetrack assembly <NUM> includes a flow path for supplying cement from the mill <NUM> to the wellbore below the whipstock <NUM>. Referring to <FIG> and <FIG>, a tubing <NUM> is disposed in the whipstock <NUM>. The lower end of the tubing <NUM> extends out of the whipstock <NUM> and is connectable with the adapter <NUM>. The tubing <NUM> fluid communicates with the central passage of the adapter <NUM>. The adapter <NUM> may be attached to a downhole tool <NUM>, thereby placing the tubing <NUM> in fluid communication with the downhole tool <NUM>. In one embodiment, the downhole tool is packer, anchor, or a combination of packer and anchor assembly. For example, the anchor may include a plurality of slips disposed on a mandrel having a bore. The packer may include a sealing element disposed on a mandrel having a bore. An exemplary packer is an inflatable packer.

<FIG> illustrates an exemplary embodiment of a packer and anchor assembly <NUM>. The packer and anchor assembly <NUM> is suitable for use as the packer <NUM> and the anchor <NUM> of <FIG>. The packer and anchor assembly <NUM> is also suitable for use as the downhole tool <NUM> attached to the whipstock <NUM> shown in <FIG>. The assembly <NUM> includes a mandrel <NUM>, a locking sleeve <NUM>, an actuating sleeve <NUM>, a sealing element <NUM>, a plurality of slips <NUM>, and wedge members <NUM>, <NUM>. The locking sleeve <NUM> is configured to attach the whipstock <NUM> to the assembly <NUM>. In one embodiment, the locking sleeve <NUM> has inwardly facing shoulders for engaging the shoulders at an end of the whipstock. The locking sleeve <NUM> may be threadedly connected to the mandrel <NUM>. The upper end of the mandrel <NUM> may include one or more lug keys for engaging the lug slots of the whipstock <NUM> to prevent relative rotation therebetween. In another embodiment, the whipstock <NUM> is threadedly connected to the packer and anchor assembly <NUM> without using a locking sleeve <NUM>.

The actuating sleeve <NUM>, the sealing element <NUM>, the plurality of slips <NUM>, and the wedge members <NUM>, <NUM> are disposed on the outer surface of the mandrel <NUM>. The sealing member <NUM> is positioned between a shoulder of the mandrel <NUM> and an upper wedge member <NUM>. The slips <NUM> are disposed between the upper wedge member <NUM> and the lower wedge member <NUM>. The actuating sleeve <NUM> is disposed below the lower wedge member <NUM>. An annular chamber <NUM> is defined between the actuating sleeve <NUM> and the mandrel <NUM>. One or more seal rings may be used to seal the annular chamber <NUM>. A hydraulic channel <NUM> through the mandrel <NUM> may be used to supply hydraulic fluid to the chamber <NUM>. It is contemplated embodiments of the whipstock <NUM> may be used with any suitable packer, anchor, or a combination of packer and anchor assembly. For example, the anchor may include a plurality of slips disposed on a mandrel having a bore. The packer may include a sealing element disposed on a mandrel having a bore.

Referring to <FIG>, the upper end of the tubing <NUM> extends out of the whipstock <NUM> and is connectable with the offset passage 155C of the mill <NUM>. During installation, the upper end of the tubing <NUM> is inserted into the offset passage 155C. The sealing members <NUM> engage the tubing <NUM> to prevent leakage. In one embodiment, the section of the tubing <NUM> inserted into the offset passage 155C is from <NUM> in. to <NUM> in. , from about <NUM> in. to <NUM> in. , or from about <NUM> in. to <NUM> in.

During assembly, the mill <NUM> is releasably attached to the whipstock <NUM>. The tubing <NUM> is inserted into the offset passage 155C, and the blades <NUM>, <NUM> are positioned in slots <NUM>, <NUM>, respectively, of the attachment section <NUM>. The shearable screw <NUM> is inserted through the hole <NUM> of the attachment section <NUM> and the slot <NUM> of the mill <NUM> to releasably attach the mill <NUM> to the whipstock <NUM>. In this example, the lug <NUM> of the mill <NUM> is engaged with the lug <NUM> of the attachment section <NUM>. In this respect, axial force may be transmitted from the mill <NUM> to the whipstock <NUM>.

<FIG> illustrate an exemplary embodiment of a cleaning tool <NUM>. <FIG> is a perspective view of the cleaning tool <NUM>. The cleaning tool <NUM> may be used as the cleaning tool <NUM> in the BHA <NUM> as shown in <FIG>. The cleaning tool <NUM> includes a body <NUM> and a plurality of cleaning elements <NUM>. The body <NUM> is configured to attach to a BHA, such as using a threaded connection. The body <NUM> may be a cylindrical body having an optional bore. In another embodiment, the body <NUM> is integrated with the BHA.

In one embodiment, the cleaning elements <NUM> are bristles that can be attached to the body <NUM>. For example, the bristles <NUM> are disposed on a screw cap <NUM>, which can be screwed into holes <NUM> formed in the body <NUM>. <FIG> is a perspective view of the cleaning tool <NUM> with some of the bristles <NUM> removed from the holes <NUM>. <FIG> is a top view of the cleaning tool <NUM>. The height of the bristles can be adjusted by controlling the depth of the screw cap <NUM> in the holes <NUM>. As shown, the bristles <NUM> are arranged at the about the same height. However, it is contemplated the bristles <NUM> may be set at different heights. For example, some bristles <NUM> are set at a first height, and some bristles are set at a second height. In one example, the bristles are made of wires. In another example, the cleaning elements are scrapers having a flat edge.

The plurality of cleaning elements can be arranged on the body <NUM> in any suitable arrangement. As shown, the cleaning elements are arranged circumferentially in a row around the body. A plurality of rows is arranged vertically along the body, and each row is rotated slightly relative to an adjacent row. The cleaning elements are spaced sufficiently from each other to minimize clogging between bristles while cleaning debris. Other suitable arrangements include a diamond grid pattern and a square grid pattern.

In operation, the cleaning tool <NUM> is attached to the lower end of an exemplary BHA. The BHA may include the packer and anchor assembly <NUM>, a whipstock <NUM>, and a mill <NUM> releasably attached to the whipstock <NUM>. After reaching the desire location, the BHA and the cleaning tool <NUM> are moved up and down relative to the wellbore to clean at least a portion of the wall of the wellbore. Optionally, the BHA and the cleaning tool <NUM> are rotated relative to the wellbore while cleaning. In some embodiments, fluid is circulated in the wellbore while operating the cleaning tool. After cleaning the wall, the packer and anchor assembly <NUM> is set. Hydraulic fluid can be supplied via the tubing <NUM> to set the anchor. For example, hydraulic is supplied to the chamber <NUM> to urge the actuating sleeve <NUM> upward, thereby moving the lower wedge member <NUM> closer to the upper wedge member <NUM>. As a result, the slips <NUM> are urged up the inclined of the wedge members and outwardly into engagement with the surround casing. The slips <NUM> are set in the cleaned portion of the wellbore wall. After setting the slips <NUM>, weight is set down on the whipstock <NUM>, thereby compressing the sealing element <NUM> between the shoulder of the mandrel <NUM> and the upper wedge member <NUM>. The sealing element <NUM> is urged outwardly into engagement with the surrounding casing to seal off fluid communication through the annulus. The sealing element <NUM> optionally engages the cleaned portion of the wellbore wall.

Additional pressure is applied to the mill <NUM> to release the mill <NUM> from the whipstock <NUM>. For example, sufficient pressure is applied from the surface to break the shearable lug or screw <NUM> connecting the mill <NUM> to the whipstock <NUM>. The mill <NUM> is then urged along the concave member of the whipstock <NUM>, which deflects the mill <NUM> outward into engagement with the casing.

In one embodiment, the whipstock <NUM> is oriented to the desired azimuth after cleaning the wellbore and before setting the anchor. For example, the cleaning tool <NUM> is reciprocated to clean the wellbore. The cleaning tool <NUM> can optionally be rotated during cleaning. After cleaning, the whipstock <NUM> can be oriented using a Measurement-While-Drilling (MWD) unit coupled to or integral with the BHA. The anchor is then set in a cleaned portion of the wellbore.

In another embodiment, the whipstock <NUM> is oriented before cleaning the wellbore. For example, the whipstock <NUM> can be oriented using a Measurement-While-Drilling (MWD) unit coupled to or integral with the BHA. After orienting the whipstock, the cleaning tool <NUM> is reciprocated to clean the wellbore. In one example, the cleaning tool is not rotated during cleaning. After cleaning, the anchor is set in a cleaned portion of the wellbore.

<FIG> illustrate another embodiment of a cleaning tool <NUM> suitable for use with a BHA. The cleaning tool <NUM> may be used as the cleaning tool <NUM> shown in <FIG>. <FIG> is a perspective view of the cleaning tool <NUM>. <FIG> is a front view of the cleaning tool <NUM>. <FIG> is a top view of the cleaning tool <NUM>. The cleaning tool <NUM> is a centralizer having a plurality of bow springs <NUM> connected between two collars <NUM>. The bow springs <NUM> are circumferentially spaced around the collars <NUM>. In one embodiment, the collars <NUM> of the cleaning tool <NUM> are disposed around a tubular body <NUM> (as shown in <FIG>), and the tubular body is attached to the BHA. In another embodiment, the collars <NUM> are disposed around a tubular body of the BHA.

A plurality of cleaning elements is disposed on an exterior surface of the bow springs <NUM>. In this example, the cleaning elements are scrapers <NUM> having a raised edge. As shown, the scrapers <NUM> are aligned horizontally relative to the bow spring <NUM>. While five scrapers are shown, any suitable number of scrapers may be used, such as one, two, three, four, six, eight, ten, or more scrapers. In another example, the scrapers are aligned at an angle relative to the bow springs. In another example, the scrapers on one bow spring are aligned at a different angle than the scrapers on another bow spring. In another embodiment, the scrapers have different heights on the same or different bow springs. For example, some scrapers are set at a first height, and some scrapers are set at a second height.

In operation, the cleaning tool <NUM> is disposed around a tubular body <NUM> that is attached to the lower end of a BHA. The BHA may include the packer and anchor assembly <NUM>, a whipstock <NUM>, and a mill <NUM> releasably attached to the whipstock <NUM>. In one embodiment, the cleaning tool <NUM> of <FIG> is also connected to the BHA. After reaching the desire location, the BHA and the cleaning tool <NUM> are moved up and down relative to the wellbore to clean the wall of the wellbore. Because gaps exist between the bow springs <NUM>, the BHA and the cleaning tool <NUM> are optionally rotated relative to the wellbore such that the bow springs can clean the gaps from the previous position of the bow springs. After rotation, the cleaning tool <NUM> is reciprocated relative to the wellbore to clean the wall of the wellbore. In another embodiment, engagement with the wellbore wall may cause the bow springs <NUM> to rotate relative to the body <NUM>, thereby cleaning at least a portion of the gaps. In some embodiments, fluid is circulated in the wellbore while operating the cleaning tool. After cleaning the wall, the packer and anchor assembly <NUM> is set. Optionally, the whipstock <NUM> is oriented either after or before cleaning the wellbore as described above. Hydraulic fluid can be supplied via the tubing <NUM> to set the anchor. The slips <NUM> are set in the cleaned portion of the wellbore wall. Compressive force is then applied to set the packer. To release the mill <NUM>, additional compressive force is applied to shear the shearable member <NUM>. The mill <NUM> is now free to move along the whipstock <NUM> to form a window in the wellbore.

<FIG> illustrate another embodiment of a cleaning tool <NUM> suitable for use with a BHA. The cleaning tool <NUM> may be used as the cleaning tool <NUM> shown in <FIG>. <FIG> is a perspective view of the cleaning tool <NUM>. <FIG> is a front view of the cleaning tool <NUM>. <FIG> is a cross-sectional view of the cleaning tool <NUM>. The cleaning tool <NUM> includes a body <NUM> and a plurality of cleaning elements <NUM> at least partially disposed in the body <NUM>. In one embodiment, the body <NUM> is a cylindrical body having a plurality of raised profiles <NUM> for housing the cleaning elements <NUM>. In this example, the cleaning elements <NUM> are disposed in a pocket <NUM> formed in the raised profiles <NUM>. The raised profiles <NUM> are arranged on opposite sides of the body <NUM>. Although two raised profiles <NUM> are shown, the cleaning tool <NUM> may have any suitable number of profiles <NUM> for housing the cleaning elements. In another embodiment, the body <NUM> is a tubular body having a bore.

In one embodiment, the cleaning elements are scraper pads <NUM>. The scraper pads <NUM> are movable between a retracted position and an extended position. <FIG> shows the scraper pads <NUM> in the retracted position. <FIG> is an enlarged, partial, front cross-sectional view of the cleaning tool <NUM>. <FIG> show the scraper pads <NUM> in the extended position. The scraper pads <NUM> are biased toward the extended position using a plurality of biasing members such as springs <NUM>. The biasing members may be disposed in recesses <NUM> formed in the scraper pads <NUM>. In one embodiment, a locking member is used to retain the scraper pads <NUM> in the retracted position during run-in. Exemplary embodiments of the locking member include a shearable mechanism such as a shearable pin and a retractable mechanism such as a retractable latch. When cleaning is desired, the locking member is disengaged to activate the scraper pads <NUM>. The locking member may be configured to disengage in response to a hydraulic force or a compressive force.

In one embodiment, the scraper pad <NUM> includes a shoulder <NUM> formed at the upper and lower axial ends of the scraper pad <NUM>. The shoulders <NUM> are configured to engage flanges <NUM>, <NUM> formed in the pocket <NUM>. The flanges <NUM> and the shoulders <NUM> interact to limit extension of the scraper pad <NUM> and to prevent the scraper pad <NUM> from coming out of the pocket <NUM>. In one example, one of the flanges <NUM> is removable to facilitate installation of the scraper pad <NUM>. The removable flange <NUM> may be attached using a screw <NUM>. Optionally, the scraper pad <NUM> includes an upper flange <NUM> on the sides of the scraper pad <NUM>. The upper flanges <NUM> are configured to engage an upper surface of the pocket <NUM> to limit retraction of the scraper pad <NUM>.

In one embodiment, a plurality of raised edges <NUM> is formed on an upper surface of the scraper pad <NUM>. As shown, the raised edges <NUM> are aligned horizontally relative to the cylindrical body <NUM>. While five raised edges <NUM> are shown, any suitable number of raised edges may be used, such as one, two, three, four, six, eight, ten, or more raised edges. In another example, the raised edges are aligned at an angle relative to the cylindrical body <NUM>. In another example, the raised edges on one scraper pad <NUM> are aligned at a different angle than the raised edges on another scraper pad <NUM>. In another embodiment, the raised edges have different heights on the same or different scraper pads <NUM>. For example, some raised edges are set at a first height, and some raised edges are set at a second height. In one embodiment, a channel <NUM> is formed through the raised edges <NUM>. The channel <NUM> may facilitate removal of debris from the raised edges <NUM> and prevent clogging of the raised edges <NUM>.

In operation, the cleaning tool <NUM> is attached to the lower end of a BHA. The BHA may include the packer and anchor assembly <NUM>, a whipstock <NUM>, and a mill <NUM> releasably attached to the whipstock <NUM>.

In one embodiment, the scraper pads <NUM> are activated to engage the wellbore wall during run-in. For example, the scraper pads are free to compliantly engage the wellbore wall during run-in. In one embodiment, the scraper pads <NUM> are arranged to minimize encounters with debris. For example, if a high side of the whipstock <NUM> faces <NUM> degrees, then one of the scraper pads <NUM> can be positioned at <NUM> degrees relative to the high side, and the other scraper pad <NUM> can be positioned at <NUM> degrees relative to the high side. During run-in, the scraper pads <NUM> will contact the side of the casing, instead of the bottom of the casing, thereby minimizing contact with debris.

In another embodiment, the scraper pads <NUM> are retained in the retracted position during run-in. For example, a locking member is used to keep the scraper pads <NUM> deactivated. After reaching the desire location, the BHA and the cleaning tool <NUM> are moved up and down relative to the wellbore to clean the wall of the wellbore. <FIG> show the scraper pads <NUM> in the extended position. If a locking member is used, the locking member is disengaged such as by applying a compressive force or supplying hydraulic force. The BHA and the cleaning tool <NUM> are optionally rotated relative to the wellbore during cleaning. Because gaps exist between the scraper pads <NUM>, the cleaning tool <NUM> is optionally rotated relative to the wellbore such that scraper pads <NUM> can clean the gaps from the previous position of the scraper pads <NUM>.

In one embodiment, the scraper pads <NUM> are axially aligned with the slips <NUM> of the anchor assembly <NUM>. For example, the two scraper pads <NUM> can be axially aligned with two slips <NUM>. In another example, if the anchor assembly <NUM> has three circumferentially spaced slips <NUM>, then three scraper pads <NUM> can be provided on the cleaning tool <NUM> and aligned with the slips <NUM>. Due to the alignment, it would not be necessary to rotate the scraper pads <NUM> to clean the gaps between scraper pads <NUM>.

In some embodiments, fluid is circulated in the wellbore while operating the cleaning tool. After cleaning the wall, the packer and anchor assembly <NUM> is set. Optionally, the whipstock <NUM> is oriented either after or before cleaning the wellbore as described above. Hydraulic fluid can be supplied via the tubing <NUM> to set the anchor at the location cleaned by the cleaning tool <NUM>. Compressive force is then applied to set the packer. To release the mill <NUM>, additional compressive force is applied to shear the shearable member <NUM>. The mill <NUM> is now free to move along the whipstock <NUM> to form a window in the wellbore.

<FIG> illustrate another embodiment of a cleaning tool <NUM> suitable for use with a BHA. The cleaning tool <NUM> may be used as the cleaning tool <NUM> shown in <FIG>. <FIG> is a perspective view of the cleaning tool <NUM>. <FIG> is a front cross-sectional view of the cleaning tool <NUM>. <FIG> is a cross-sectional view of the cleaning tool <NUM>. The cleaning tool <NUM> is similar to the cleaning tool <NUM> of <FIG>, and, for sake of clarity, many of the same features will not be further described in detail. The cleaning tool <NUM> includes a body <NUM> and a plurality of cleaning elements <NUM> at least partially disposed in the body <NUM>. In this embodiment, the body <NUM> is a tubular body having eight raised profiles <NUM> for housing eight cleaning elements <NUM>. The cleaning elements <NUM> are disposed in a pocket <NUM> formed in the raised profiles <NUM>.

In one embodiment, the cleaning elements are scraper pads <NUM>. A first set of four scraper pads <NUM> are circumferentially spaced around the tubular body <NUM>. A second set of four scraper pads <NUM> are disposed axially above the first set of scraper pads <NUM>. Other suitable numbers of scraper pads and arrangements are envisioned. For example, three sets of three scraper pads can be arranged on the body <NUM>. Flow channels <NUM> are formed between two adjacent scraper pads <NUM>. In this embodiment, the flow channels <NUM> of the second set of scraper pads <NUM> are not axially aligned with the flow channels <NUM> of the first set of scraper pads <NUM>. The scraper pads <NUM> are movable between a retracted position and an extended position. The scraper pads <NUM> are biased toward the extended position using a plurality of biasing members such as springs <NUM>. The biasing members may be disposed in recesses <NUM> formed in the scraper pads <NUM>. In one embodiment, a locking member is used to retain the scraper pads <NUM> in the retracted position during run-in. A plurality of raised edges <NUM> are formed on an upper surface of the scraper pad <NUM>. As shown, the raised edges <NUM> are aligned horizontally relative to the cylindrical body <NUM>.

In one embodiment, the cleaning tool <NUM> includes a mill head <NUM> disposed at a lower end thereof. The mill head <NUM> is shown with two blades <NUM>, but could have three, four, five, or more blades. The tubular body <NUM> includes a central bore <NUM>. The central bore <NUM> fluidly communications with a plurality of exit bores <NUM> located at the lower end of the tubular body <NUM>. Fluid can be supplied through the central bore <NUM> and the exit bores <NUM> for fluid circulation during the cleaning process.

<FIG> illustrate another embodiment of a cleaning tool <NUM> suitable for use with a BHA. The cleaning tool <NUM> may be used as the cleaning tool <NUM> shown in <FIG>. <FIG> is a perspective view of the cleaning tool <NUM>. <FIG> is a cross-sectional view of the cleaning tool <NUM>. <FIG> is a perspective view of a scraper pad <NUM> of the cleaning tool <NUM>. The cleaning tool <NUM> includes a body <NUM> and a plurality of cleaning elements <NUM> at least partially disposed in the body <NUM>. In one embodiment, the body <NUM> is a tubular body having a plurality of pockets <NUM> for housing the cleaning elements <NUM>.

In one embodiment, the cleaning elements are scraper pads <NUM>. The scraper pads <NUM> are movable between a retracted position and an extended position. <FIG> shows the scraper pads <NUM> in the retracted position. The scraper pads <NUM> are shown retracted in a pocket <NUM> of the body <NUM>. A sealing member such as an o-ring <NUM> is disposed between the scraper pad <NUM> and the pocket <NUM>. A guide <NUM>, such as a rod, is threadedly attached to the scraper pad <NUM> and is disposed in a side bore <NUM>. The side bore <NUM> fluidly communicates with a central bore <NUM> of the tubular body <NUM>. The scraper pads <NUM> are biased toward the retracted position using a plurality of biasing members such as springs <NUM>. The spring <NUM> is disposed around the guide <NUM> and between a shoulder of the guide <NUM> and a shoulder of the side bore <NUM>. <FIG> show the scraper pads <NUM> in the extended position. The scraper pads <NUM> may be extended by pressurizing the central bore <NUM> and the side bores <NUM>. In one example, the side bore <NUM> can be formed by drilling through the body <NUM> from an end opposite the pocket <NUM>. After installation of the guide <NUM> and the spring <NUM>, a plug <NUM> is installed at the opposite end to close off the side bore <NUM>.

An exemplary scraper pad <NUM> is shown in <FIG>. The scraper pad <NUM> has a circular body and includes a plurality of raised edges 745A-B formed on different sections of the scraper pad <NUM>. In this example, the raised edges 745A in two sections are aligned in a different direction relative to the raised edges 745B in two other sections. While three raised edges 745A-B are shown for each section, any suitable number of raised edges may be used, such as one, two, four, five, six, or more raised edges. In another embodiment, the raised edges 745A-B have different heights on the same or different scraper pads <NUM>. For example, some raised edges are set at a first height, and some raised edges are set at a second height.

<FIG> illustrate another embodiment of a scraper pad <NUM>. The scraper pad <NUM> has a rectangular body and includes a plurality of raised edges <NUM> formed on an upper surface of the body. In this example, the raised edges <NUM> are shaped like splines and are disposed between grooves. Any suitable number of raised edges may be used, such as one, two, four, five, six, or more raised edges. In another embodiment, the raised edges <NUM> have different heights on the same or different scraper pads <NUM>. For example, some raised edges are set at a first height, and some raised edges are set at a second height.

The plurality of scraper pads <NUM>, <NUM> can be arranged on the body <NUM> in any suitable arrangement. As shown in <FIG>, the scraper pads <NUM> are arranged circumferentially in a row around the body <NUM>. A plurality of rows is arranged vertically along the body <NUM>, and each row is rotated slightly relative to an adjacent row. The scraper pads are spaced sufficiently to minimize clogging between scraper pads <NUM> while cleaning debris. In another embodiment, each row may include two, four, or six scraper pads.

In operation, the cleaning tool <NUM> is attached to the lower end of a BHA. For example, the BHA can be the BHA <NUM> shown in <FIG>. In one embodiment, the BHA includes the packer and anchor assembly <NUM>, a whipstock <NUM>, and a mill <NUM> releasably attached to the whipstock <NUM>. During run-in, the scraper pads <NUM> are retracted by the spring <NUM>.

After reaching the desire location, the scraper pads <NUM> are activated to contact the wall of the wellbore. Pressure in the central bore <NUM> is increased to overcome the biasing force of the spring <NUM>, thereby extending the scraper pads <NUM> outward. The BHA and the cleaning tool <NUM> are moved up and down relative to the wellbore to clean the section of the wall where the anchor will be set. <FIG> show the scraper pads <NUM> in the extended position. The BHA and the cleaning tool <NUM> are optionally rotated relative to the wellbore during cleaning.

<FIG> is a perspective view of another embodiment of a cleaning tool <NUM> suitable for use with a BHA. The cleaning tool <NUM> may be used as the cleaning tool <NUM> shown in <FIG>. <FIG> is a cross-sectional view of the cleaning tool <NUM>. <FIG> are cross-sectional views of sequential operation of the cleaning tool <NUM>. The cleaning tool <NUM> includes a body <NUM> and a plurality of cleaning elements <NUM> at least partially disposed in the body <NUM>. In one embodiment, the body <NUM> is a tubular body having a central bore <NUM> and a plurality of pockets <NUM> formed in body <NUM> to house the cleaning elements <NUM>. In this embodiment, two pockets <NUM> are arranged on opposite sides of the body <NUM>. Although two pockets <NUM> are shown, the cleaning tool <NUM> may have any suitable number of pockets <NUM> for housing a corresponding number of the cleaning elements.

In one embodiment, the cleaning elements are scraper pads <NUM>. The scraper pads <NUM> are movable between a retracted position and an extended position. <FIG> and <FIG> show the scraper pads <NUM> in the retracted position. <FIG> are cross-sectional views of two different sections of the cleaning tool <NUM> with the scraper pads <NUM> in the retracted position. The scraper pads <NUM> may be hydraulically activated between the retracted and extended positioned. The scraper pads <NUM> are coupled to a guide <NUM> disposed in the pocket <NUM>. In one embodiment, the upper portion of the guide <NUM> includes a flange for engaging a flange formed on a lower portion of the scraper pad <NUM>, as shown in <FIG> and <FIG>. Interaction between the flanges limit upward movement of the scraper pad <NUM> relative to the guide <NUM>. The lower portion of the scraper pad <NUM> is movable in a groove <NUM> of the guide <NUM>. A plurality of biasing members <NUM> are used to bias the scraper pads <NUM> against the guide <NUM>. An exemplary biasing member <NUM> is a spring. The spring keeps the scraper pad <NUM> in the outward position relative to the guide <NUM>. However, the scraper pad <NUM> is allowed to move inward is a restriction or obstruction is encountered.

A piston <NUM> is disposed in the bore <NUM> and configured to engage the guide <NUM>. In one embodiment, the piston <NUM> includes an actuating profile <NUM> engageable with a mating profile <NUM> formed on the lower end of the guide <NUM>. The actuating profile <NUM> and the mating profile <NUM> may be an undulating profile having peaks and valleys. In <FIG>, the peaks of the actuating profile <NUM> are engaged with the valleys of the mating profile <NUM>. In this position, the scraper pads <NUM> are retracted. A first shearable member <NUM> is used to retain the piston <NUM> in this position during run-in. A second shearable member <NUM> is engaged with a first slot formed on an outer surface of the piston <NUM>. An exemplary shearable member <NUM>, <NUM> is a shearable pin. An extendable locking member <NUM> is biased against an outer surface of the piston <NUM>.

In one embodiment, a plurality of raised edges <NUM> is formed on an upper surface of the scraper pad <NUM>. As shown, the raised edges <NUM> are aligned horizontally relative to the tubular body <NUM>. Any suitable number of raised edges <NUM> may be used, such as one, two, four, six, eight, ten, or more raised edges. In another example, the raised edges are aligned at an angle relative to the cylindrical body <NUM>. In another embodiment, the raised edges have different heights on the same or different scraper pads <NUM>. For example, some raised edges are set at a first height, and some raised edges are set at a second height.

In operation, the cleaning tool <NUM> is attached to the lower end of a BHA. For example, the BHA can be the BHA <NUM> shown in <FIG>. In one embodiment, the BHA may include the packer and anchor assembly <NUM>, a whipstock <NUM>, and a mill <NUM> releasably attached to the whipstock <NUM>. During run-in, the scraper pads <NUM> are in the retracted position as shown in <FIG> and <FIG>.

After reaching the desire location, the scraper pads <NUM> are activated to contact the wall of the wellbore. Pressure in the central bore <NUM> is increased to shear the first shearable member <NUM>. Thereafter, the piston <NUM> is urged toward the lower end of the body <NUM> and relative to the guide <NUM>. Movement of the piston <NUM> is stopped when the second shearable member <NUM> reaches the end of the first slot <NUM>, as shown in <FIG>. The retractable member <NUM> has been extended to engage a first depth of the second slot <NUM>. The piston <NUM> has moved relative to the guide <NUM> such that the peaks of the actuating profile <NUM> are engaged with the peaks of the mating profile <NUM>. In this respect, the guide <NUM> is urged radially outward, thereby moving the scraper pads <NUM> to the extended position. <FIG> and <FIG> show the scraper pads <NUM> in the extended position. The BHA and the cleaning tool <NUM> are moved up and down relative to the wellbore to clean the section of the wall where the anchor will be set. The BHA and the cleaning tool <NUM> are optionally rotated relative to the wellbore during cleaning. Because gaps exist between the scraper pads <NUM>, the cleaning tool <NUM> is optionally rotated relative to the wellbore such that scraper pads <NUM> can clean the gaps from the previous position of the scraper pads <NUM>. In some embodiments, fluid is circulated in the wellbore while operating the cleaning tool.

In one embodiment, the scraper pads <NUM> are axially aligned with the slips <NUM> of the anchor assembly <NUM>. For example, the two scraper pads <NUM> can be axially aligned with two slips <NUM>. Due to the alignment, it would not be necessary to rotate the scraper pads <NUM> to clean the gaps therebetween.

After cleaning the wall, additional pressure is supplied to shear the second shearable member <NUM>. Thereafter, the piston <NUM> is moved further toward the lower end of the body <NUM> and relative to the guide <NUM>. Movement of the piston <NUM> is stopped when the retractable member <NUM> reaches the end of the second slot <NUM>, as shown in <FIG>. As shown, the retractable member <NUM> has extended further to engage a second depth of the second slot <NUM>. In this respect, the piston <NUM> is no longer allowed to move axially in the bore <NUM>. After moving the piston <NUM> relative to the guide <NUM>, the peaks of the actuating profile <NUM> are engaged with the valleys of the mating profile <NUM>. In this respect, the guide <NUM> is allowed to move radially inward, thereby moving the scraper pads <NUM> to the retracted position. <FIG> show the scraper pads <NUM> in the retracted position. Optionally, the whipstock <NUM> is oriented either after or before cleaning the wellbore as described above.

After cleaning the wall, the packer and anchor assembly <NUM> is set. Hydraulic fluid can be supplied via the tubing <NUM> to set the anchor. For example, hydraulic is supplied to the chamber <NUM> to urge the actuating sleeve <NUM> upward, thereby moving the lower wedge member <NUM> closer to the upper wedge member <NUM>. As a result, the slips <NUM> are urged up the inclined of the wedge members and outwardly into engagement with the surround casing. After setting the slips <NUM>, weight is set down on the whipstock <NUM>, thereby compressing the sealing element <NUM> between the shoulder of the mandrel <NUM> and the upper wedge member <NUM>. The sealing element <NUM> is urged outwardly into engagement with the surrounding casing to seal off fluid communication through the annulus.

For any of the embodiments described herein, it is contemplated the bottom hole assembly can have any suitable combination of downhole tools coupled to the cleaning tool. For example, the BHA can have any suitable combination of a whipstock, one or more downhole tools, and a cleaning tool. In one example, a packer <NUM>, an anchor <NUM>, and a cleaning tool <NUM> can be sequentially coupled to whipstock <NUM>, as shown in <FIG>. In another example, the downhole tools can be arranged in any suitable order; such as the packer <NUM>, the cleaning tool <NUM>, and then the anchor <NUM>, as shown in <FIG>; or the cleaning tool <NUM>, the packer <NUM>, and then the anchor <NUM>, as shown in <FIG>. In one example, the packer and the anchor are combined as a single downhole tool. In another example, the cleaning tool is integral with a downhole tool such as an anchor, a packer, a whipstock, or combinations thereof. In yet another example, a packer <NUM> and a cleaning tool <NUM> are attached in order, or in reverse order, below the whipstock <NUM>, as shown in <FIG>, respectively. In yet another example, an anchor <NUM> and a cleaning tool <NUM> are attached in order, or in reverse order, below the whipstock <NUM>, as shown in <FIG>, respectively. In one embodiment, the whipstock <NUM> can be releasably attached to an optional milling tool <NUM>.

In one embodiment, a bottom hole assembly having a cleaning tool and a downhole tool is lowered into the wellbore. After reaching the desire location, the cleaning tool is reciprocated up and down relative to the wellbore to clean at least a portion of the wall of the wellbore. Optionally, the cleaning tool is rotated relative to the wellbore while cleaning. In some embodiments, fluid is circulated in the wellbore while operating the cleaning tool. After cleaning the wall, the downhole tool is activated into contact with the cleaned portion of the wall. In on example, hydraulic fluid can be supplied via the tubing <NUM> to activate the downhole tool. For example, the downhole tool can be an anchor, and hydraulic is supplied to activate the slips. The slips are set in the cleaned portion of the wellbore wall. After setting the slips, if the BHA includes a packer, then weight is applied to set the packer. The packer optionally engages the cleaned portion of the wellbore wall.

If the BHA includes a whipstock, then the whipstock is oriented to the desired azimuth after cleaning the wellbore and before setting the anchor. For example, the cleaning tool is reciprocated to clean the wellbore. The cleaning tool can optionally be rotated during cleaning. After cleaning, the whipstock can be oriented using a Measurement-While-Drilling (MWD) unit coupled to or integral with the BHA. The anchor is then set in a cleaned portion of the wellbore.

In another embodiment, the whipstock is oriented before cleaning the wellbore. For example, the whipstock can be oriented using a Measurement-While-Drilling (MWD) unit coupled to or integral with the BHA. After orienting the whipstock, the cleaning tool is reciprocated to clean the wellbore. In one example, the cleaning tool is not rotated during cleaning. After cleaning, the anchor is set in a cleaned portion of the wellbore.

If the BHA includes a mill attached to the whipstock, then additional pressure is applied to the mill to release the mill from the whipstock. For example, sufficient pressure is applied from the surface to break a shearable lug or screw connecting the mill to the whipstock. The mill is then urged along the concave member of the whipstock, which deflects the mill outward into engagement with the casing.

In another embodiment, a method of positioning a bottom hole assembly in a wellbore includes lowering the bottom hole assembly into the wellbore, the bottom hole assembly having a downhole tool and a cleaning tool having a cleaning element. The method also includes cleaning at least a portion of a wall of the wellbore using the cleaning tool and activating the downhole tool to engage the cleaned portion of the wall.

In one embodiment, a bottom hole assembly for use in a wellbore includes a downhole tool; and a cleaning tool coupled to the downhole tool for cleaning a portion of a wall of the wellbore. In one example, the cleaning tool includes a body; and a plurality of cleaning elements for cleaning the portion of the wall, wherein the downhole tool is configured to engage the cleaned portion of the wall.

In one embodiment, a bottom hole assembly for use in a wellbore includes a whipstock; a downhole tool coupled to the whipstock; and a cleaning tool coupled to the downhole tool for cleaning a portion of a wall of the wellbore, wherein the downhole tool is configured to engage the cleaned portion of the wall. In one example, the cleaning tool includes a body and a plurality of cleaning elements for cleaning the portion of the wall.

In one or more of the embodiments described herein, the cleaning tool includes a plurality of pockets formed in the body; and the plurality of cleaning elements disposed in the plurality of pockets and movable between a retracted position and an extended position.

In one or more of the embodiments described herein, the cleaning tool includes a biasing member for biasing the plurality of cleaning elements to the extended position.

In one or more of the embodiments described herein, the plurality of cleaning elements is hydraulically actuated.

In one or more of the embodiments described herein, the cleaning tool includes a hydraulically actuated piston configured to move the plurality of cleaning elements to the extended position.

In one or more of the embodiments described herein, the piston includes an actuating profile for engaging a mating profile of each cleaning element.

In one or more of the embodiments described herein, each cleaning element is coupled to a guide using a biasing member.

In one or more of the embodiments described herein, the cleaning elements include a scraping profile.

In one or more of the embodiments described herein, the scraping profile comprises raised edges.

In one or more of the embodiments described herein, the downhole tool comprises an anchor having a slip, and the plurality of cleaning elements are axially aligned with the slip of the anchor.

In one or more of the embodiments described herein, the plurality of cleaning elements are threadedly attached to the body.

In one or more of the embodiments described herein, the plurality of cleaning elements comprises bristles.

In one or more of the embodiments described herein, a height of the cleaning elements is adjustable.

In one or more of the embodiments described herein, the cleaning tool includes a centralizer disposed around the body, the centralizer having a plurality of bow springs; and the plurality of cleaning elements disposed on the plurality of bow springs.

In one or more of the embodiments described herein, the plurality of cleaning elements comprises scrapers.

In one or more of the embodiments described herein, the downhole tool comprises an anchor.

In one or more of the embodiments described herein, a milling tool releasably connected to the whipstock.

In one or more of the embodiments described herein, the BHA includes a packer.

In one or more of the embodiments described herein, the packer is configured to engage the cleaned portion of the wall.

In one or more of the embodiments described herein, the downhole tool comprises a packer.

In one or more of the embodiments described herein, the cleaning tool is integral with the downhole tool.

In one embodiment, a method of positioning a bottom hole assembly in a wellbore includes lowering the bottom hole assembly into the wellbore, the bottom hole assembly having a whipstock, a downhole tool, and a cleaning tool having a cleaning element; cleaning at least a portion of a wall of the wellbore using the cleaning tool; and activating the downhole tool to engage the cleaned portion of the wall.

In one or more of the embodiments described herein, the cleaning element is movable between a retracted position and an extended position.

In one or more of the embodiments described herein, the cleaning element is lowered into the wellbore in the extended position.

In one or more of the embodiments described herein, the cleaning element is lowered into the wellbore in the retracted position, and the method includes moving the cleaning element to the extended position to clean the portion of the wall.

In one or more of the embodiments described herein, the cleaning element is biased to the extended position.

In one or more of the embodiments described herein, the method includes supplying hydraulic fluid to move the cleaning element to the extended position.

In one or more of the embodiments described herein, the method includes engaging the cleaning element with an actuating profile of a piston to move the cleaning element between the retracted position and the extended position.

In one or more of the embodiments described herein, the method includes axially aligning the cleaning element with a slip of the anchor.

In one or more of the embodiments described herein, the method includes orienting the whipstock before setting the anchor.

In one or more of the embodiments described herein, the whipstock is oriented after cleaning the wellbore.

In one or more of the embodiments described herein, the whipstock is oriented before cleaning the wellbore.

In one or more of the embodiments described herein, the bottom hole assembly includes a packer, and the method further comprises activating the packer to engage the cleaned portion of the wall.

In one or more of the embodiments described herein, wherein cleaning the portion of the wall comprises reciprocating the cleaning tool.

In one or more of the embodiments described herein, wherein cleaning the portion of the wall further comprises rotating the cleaning tool while reciprocating.

In one or more of the embodiments described herein, wherein cleaning the portion of the wall further comprises rotating the cleaning tool and further reciprocating the cleaning tool.

In one or more of the embodiments described herein, the method includes circulating fluid while cleaning.

Claim 1:
A bottom hole assembly for use in a wellbore, comprising:
a whipstock (<NUM>, <NUM>, <NUM>);
a downhole tool (<NUM>, <NUM>, <NUM>); and
a cleaning tool (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>) coupled to the downhole tool (<NUM>, <NUM>, <NUM>), the cleaning tool (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>) or the downhole tool (<NUM>, <NUM>, <NUM>) coupled to the whipstock (<NUM>, <NUM>, <NUM>), the cleaning tool (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>) having:
a body (<NUM>, <NUM>, <NUM>, <NUM>); and
a plurality of cleaning elements (<NUM>, <NUM>, <NUM>, <NUM>) disposed at least partially in the body (<NUM>, <NUM>, <NUM>, <NUM>) and being movable to an extended position, the cleaning elements (<NUM>, <NUM>, <NUM>, <NUM>) in the extended position being configured to clean a portion of a wall of the wellbore,
wherein the downhole tool (<NUM>, <NUM>, <NUM>) is configured to engage the cleaned portion of the wall.