Abstract:
An open hole is drilled with coiled tubing that has an electric line. At the conclusion of drilling the drilling bottom hole assembly is removed and a liner running tool is connected between the coiled tubing and the liner. The electric line remains in the coiled tubing but spacers can be added to keep the lower end of the electric line away from the running tool. A wiper plug has a passage therethrough and a movable stinger that can hold open a pair of flapper valves. The liner is released from the running tool and cement is delivered through the stinger with a bit of excess that is above the running tool. The lifting of the stinger with the coiled tubing closes the flappers and allows circulation out of excess cement. Setting down on the coiled tubing allows a seal to re-engage in the deployment sleeve, allowing pressure to be placed against the wiper plug, such that it can be launched to displace the remaining cement within the liner into the annulus around the liner.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
       [0001]    This application is a continuation of U.S. patent application Ser. No. 12/640,942, filed Dec. 17, 2009, which claims the benefit of U.S. Provisional Application Ser. No. 61/203,567, filed Dec. 23, 2008, the teachings of which are incorporated herein by reference in their entirety and U.S. patent application Ser. No. 12/637,105, filed Dec. 14, 2009, which claims the benefit of U.S. Provisional Application Ser. No. 61/122,914, Dec. 16, 2008. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The present invention relates to a method and apparatus for cementing a liner in place in an open borehole using a tubular member having an obstruction in the tubular member where cement is passed through the tubular member into the liner and through the liner into an annular space surrounding the liner to position the liner in the open borehole. More particularly the invention relates to liner cementing of a well drilled with electric line coiled tubing using the same coiled tubing as was used to drill the well. 
       BACKGROUND OF THE INVENTION 
       [0003]    In the drilling and completion of boreholes from a wellbore it is necessary to cement liners in place in the boreholes to enable the completion of the well for the production of fluids from the subterranean formation penetrated by the borehole. The boreholes may be lateral wells drilled from a wellbore using a whipstock at any desired angle or orientation or they may be wells which extend below the bottom of the well portion drilled by conventional means. Tubular members, such as drillpipe and coiled tubing are widely used for drilling such boreholes. 
         [0004]    Tubular members can be used to cement a liner in place in a borehole. Typically the cement is injected through the tubular member into the liner with the cement then passing out of the end of the liner at the end of the liner and then into the annulus between the outside of the liner and the inside of the borehole. This places cement around the liner so that perforation of the formation and the like can be accomplished as well as other operations if desirable. 
         [0005]    Typically the liner may be maintained in a central position in the borehole by the use of centralizers, as known to those skilled in the art. In such completions, the cement is passed downwardly through the tubular member and through a liner wiper plug having an opening and a passage therethrough so as to inject the cement into the liner and into the annular space around the outside of the liner and the inside of the borehole. 
         [0006]    As the cement is injected, a cement cleanout fluid is used to push a tubular member wiper dart, which separates the cement from the cement cleanout fluid, through the tubular member downwardly and into the liner. When the cement cleanout fluid has pushed the tubular member wiper dart into the liner wiper plug, the tubular member wiper dart contacts and plugs the opening in the liner wiper plug and the combined dart/plug becomes impermeable to fluid flow into the liner, thereby resulting in the dart/plug combination being pushed through the liner and forcing the cement in the liner to its toe end and then into the annular space around the liner. The cleanout fluid is separated from the cement by the combined wiper dart and liner wiper plug. The cement cleanout fluid may be pushed through the tubular member by drilling mud or any other suitable liquid. This is a commonly used procedure to cement liners in place in subterranean boreholes and the like. Unfortunately this procedure is not suitable for use with a tubular member containing an obstruction, since the obstruction inhibits or otherwise prohibits travel of the tubular member wiper dart. 
         [0007]    Frequently coiled tubing (a tubular member) including a wire, cable or a bundle of wires, is used for drilling lateral boreholes or other operations within the wellbore. It will be immediately apparent that the procedure just discussed is not effective to cement liners in wells using a tubular member, including a wire, since the wire makes it impossible to pass the tubular member wiper dart through the tubular member. Similarly drillpipe, which is also a suitable tubular member, is not effective when the drillpipe includes an obstruction which makes it impossible to use a drillpipe member wiper dart. 
         [0008]    Accordingly, when tubular member drilling techniques are used it has been necessary to change out the tubular member containing the wire for a tubular member containing no wire prior to cementing liners into place. This has been a necessary operation and can be quite expensive and time consuming. The cost to make this exchange has been estimated to typically run in the neighborhood of $100,000 per exchange. 
         [0009]    One way a wellbore can be drilled is to use a downhole motor supported by coiled tubing. A drill bit is powered by the downhole motor and flow through the coiled tubing operates the motor. Part of the bottom hole assembly includes known tools to steer the bit so that the well is drilled with the desired orientation. The communication between the bottom hole assembly (BHA) and the surface takes place through an electric line inside the coiled tubing. After the well was drilled to the target depth, the BHA was removed with reeling in the coiled tubing and a separate coil of coiled tubing without an electric line was connected to a liner to be run in to hole bottom and then cemented. 
         [0010]    The reason that two separate coils were required was that the coil used for drilling had the electric line in it and when it came time to displace cement that had to go through the coiled tubing a wiper plug that was typically used for cement displacement could not go down the coiled tubing because the electric line was in it. To get around this problem in the past, a separate coiled tubing reel was kept at the surface of the well so that at the conclusion of the drilling operation the reel of coiled tubing without the electric line could be deployed along with a liner running tool so that the liner could be delivered to hole bottom. Once on bottom the liner was released but remained in a sealed relation to the running tool so that cement could be delivered in the required volume into the liner. The liner had a cementing shoe on bottom. Typically, the liner had a wiper plug on top with a passage through it through which the cement was delivered. After delivery of a measured volume of cement a dart would be launched to land in the wiper plug and pressure was built up to launch the wiper plug to land it just above the cement shoe at the liner bottom. This would push all the cement into the annular space surrounding the liner. The coiled tubing could then be released from the liner and the excess cement circulated out. The coiled tubing would then be coiled up on the reel at the surface. While this procedure got the job done it was expensive to keep two coiled tubing reels at the well site and the present invention addresses a way to get the same job done without employing the second coiled tubing assembly. It can also provide an assurance that uncontaminated cement is delivered to the annulus around the liner to be cemented and a way to remove an excess amount of barrier cement from the coiled tubing to insure its continuing functionality for other jobs. 
         [0011]    Accordingly a continuing effort has been made to discover ways of cementing liners in boreholes using tubular members containing obstructions without changing out the tubular members containing obstructions. These and other aspects of the present invention will be more readily apparent to those skilled in the art from a review of the detailed description of the preferred embodiment and the associated drawings while recognizing that the full scope of the invention is to be determined by the literal and equivalent scope of the attached claims. 
       SUMMARY OF THE INVENTION 
       [0012]    An open hole is drilled with coiled tubing that has an electric line. At the conclusion of drilling the drilling bottom hole assembly is removed and a liner running tool is connected between the coiled tubing and the liner. The electric line remains in the coiled tubing but spacers can be added to keep the lower end of the electric line away from the running tool. A wiper plug has a passage therethrough and a movable stinger that can hold open a pair of flapper valves. The liner is released from the running tool and cement is delivered through the stinger with a bit of excess that is above the running tool. The lifting of the stinger with the coiled tubing closes the flappers and allows circulation out of excess cement. Setting down on the coiled tubing allows a seal to re-engage in the deployment sleeve, allowing pressure to be placed against the wiper plug, such that it can be launched to displace the remaining cement within the liner into the annulus around the liner. 
         [0013]    According to the present invention, a method has been found for cementing a liner having a (heel) top end and a (toe) bottom end positioned in an open borehole extending from a wellbore produced by drilling with a drilling apparatus including a tubular member having at least one obstruction in the tubular member, the method comprising:
       injecting cement into the liner through the tubular member;   passing a cement cleanout fluid through the tubular member to move the cement through the tubular member;   the cement and cement cleanout fluid forming a cement cleanout fluid/contaminated cement fluid interface material, to a selected distance upstream from the top end of the liner;   stopping injection before any cement cleanout fluid/contaminated cement enters the liner;   closing the flow path of fluids down the liner at the top end of the liner at or near the liner wiper plug;   discharging the cement and cement contaminated by the cement cleanout fluid remaining in the tubular member above the liner wiper plug into an annular space between an outer surface of the tubular member and inner surface of the wellbore above the top of the liner;   discharging additional cement cleanout fluid from the tubular member to move contaminated cement further up the annulus;   shutting off flow to the annulus,   releasing the liner wiper plug;   resuming flow down the liner by passing fluid through the tubular member to push the liner wiper plug to the toe end of liner; and   reestablishing flow to the annulus above the top of the liner so additional fluid passed by the tubular member can fully remove contaminated cement from wellbore.       
 
         [0025]    The invention in another aspect is directed to a method for cementing a liner in position in an open borehole extending from a wellbore and produced by drilling using a drilling apparatus including a tubular member having at least one obstruction in the tubular member, the cement being supplied through the tubular member, the method comprising:
       positioning a liner in the open borehole, the liner extending from a toe end of the liner near a toe end of the open borehole to a deployment sleeve being positioned on a top end of the liner and located within casing or production tubing, the deployment sleeve being adapted to matingly connect to a liner running tool, the liner running tool including an extension having a passageway through the liner running tool and the extension and a liner wiper plug having an opening extending therethrough with the extension extending through the opening, a cover biased to cover the opening when the extension is withdrawn and a releasable retaining apparatus adapted to releasably retain the liner wiper plug in a selected position in the liner;   positioning the liner running tool in fluid communication with the deployment sleeve;   injecting cement into the liner through the tubular member and the liner running tool in a selected amount greater than required to fill an annular space between an outside of the liner and the inside of the open borehole and to a level above the deployment sleeve;   injecting a cement cleanout fluid in contact with the cement through the tubular member in an amount sufficient to displace the selected amount of cement into the liner and the annular space outside the liner;   stopping injection of the cement cleanout fluid prior to injecting cement cleanout fluid through the liner wiper plug,   removing the liner running tool to a position above the deployment sleeve,   withdrawing the extension from the liner wiper plug,   closing the cover and passing additional cement cleanout fluid through the passageway to pass excess cement and cement contaminated with cement cleanout fluid up the wellbore and outside the tubular member;   retracting the extension to a suitable length to permit positioning the liner running tool in the deployment sleeve and releasing the liner wiper plug;   injecting additional cement cleanout fluid through the liner running tool to move the liner wiper plug to the toe end of the liner and fill the liner upstream of the liner wiper plug with cement cleanout fluid; and,   releasing the liner running tool from the deployment sleeve and continuing to inject additional cement cleanout fluid to move contaminated cement up the wellbore outside the tubular member.       
 
         [0037]    The invention also is directed to an apparatus for cementing a liner in an open borehole extending from a wellbore and produced by drilling using a drilling apparatus including a tubular member having at least one obstruction in the tubular member. The apparatus comprises:
       a liner running tool adapted to be run down the wellbore on the tubular member and including a body configured for mating connection to the liner, the body including an extension having a passageway through the liner running tool and the extension to permit fluid flow through the liner running tool;   a liner wiper plug having an opening extending therethrough and adapted to receive the extension of the body extending through the opening on the liner wiper plug,   a cover positioned on the liner wiper plug and adapted to cover the opening on the liner wiper plug when the extension of the body is withdrawn from the opening and   a releasable retaining apparatus for the liner wiper plug and adapted to releasably retain the liner wiper plug in a selected position in the liner.       
 
         [0042]    In another aspect, the invention is directed to a method for cementing a liner having a (heel) top end and a (toe) bottom end in position in an open borehole extending from a wellbore produced by drilling with a drilling apparatus including a tubular member having at least one obstruction in the tubular member. The tubular member has a discharge end fluidly connected to a passageway in a liner wiper plug positioned within the liner at the heel end of the liner such that fluids conveyed by the tubular member may be injected into the liner. The liner wiper plug has a valve operable to discontinue flow through the passageway. The tubular member and the heel end of the liner are located within the wellbore that extends upwardly such that fluids from the well may be conveyed to the earth&#39;s surface through the wellbore. The method comprises:
       a) injecting cement into the liner through the tubular member and the liner wiper plug;   b) passing a cement cleanout fluid through the tubular member to move the cement through the tubular member such that an interface between the cement and the cement cleanout fluid is a selected distance upstream from the toe end of the liner;   c) discontinuing fluid communication between the tubular member and both the heel end of the liner and the liner wiper plug and closing the valve on the liner wiper plug positioned in the heel end of the liner;   d) passing the cement cleanout fluid through the tubular member to discharge the cement above the selected distance and cement contaminated by the cement cleanout fluid from the tubular member up the production tubing; and   e) reestablishing fluid communication between the tubular member and the heel end of the liner and passing additional cement cleanout fluid through the tubular member to pass the liner wiper plug through the liner and thereby displace cement from the liner into an annular space outside the liner and an inside surface of the open borehole.       
 
         [0048]    In another aspect, the invention concerns a method for cementing a liner in position in an open borehole extending from a wellbore and produced by drilling using a drilling apparatus including a tubular member having an outside surface and having at least one obstruction in the tubular member. The cement is supplied through the tubular member which is positioned within production tubing having an inside surface and extending upwardly through the wellbore such that fluids from the well may be conveyed to the earth&#39;s surface by the production tubing. The method comprises:
       a) positioning a liner in the open borehole, the liner extending from a toe end of the liner near a toe end of the open borehole to a deployment sleeve positioned on a heel end of the liner and located in the production tubing, the deployment sleeve being adapted to sealingly connect to a liner running tool, the liner running tool including an extension and having a passageway through the liner running tool and the extension, the heel end of the liner having a liner wiper plug with an opening therein extending through the liner wiper plug so that fluids may be conveyed therethrough, the extension of the liner running tool being in fluid communication with and extending through the opening so that fluids conveyed by the tubular member may be conveyed through the passageway and the opening through the liner wiper plug, the liner wiper plug having a cover biased to cover the opening and restrict flow of fluids through the opening when the extension is withdrawn from the opening and a releasable retaining apparatus adapted to releasably retain the liner wiper plug in a selected position in the liner;   b) positioning the liner running tool in fluid communication with the deployment sleeve;   c) injecting cement into the liner through the tubular member and the liner running tool in a selected amount greater than required to fill an annular space between an outside of the liner and an inside of the open borehole such that cement is at a level within the tubular member above the deployment sleeve;   d) injecting a cement cleanout fluid in contact with the cement through the tubular member in an amount sufficient to displace the selected amount of cement into the liner and the annular space outside the liner within the open borehole;   e) stopping injection of the cement cleanout fluid prior to injecting cement cleanout fluid through the liner wiper plug,   f) removing the liner running tool to a position above the deployment sleeve and sufficient to release the liner running tool from being in fluid communication with the deployment sleeve, thereby withdrawing the extension from the liner wiper plug and closing the cover to the opening of the liner wiper plug;   g) passing additional cement cleanout fluid through the passageway to pass excess cement and cement contaminated with cement cleanout fluid up the wellbore within an annulus defined by the outside surface of the tubular member and inside surface of the production tubing;   h) retracting the extension to a suitable length to permit repositioning of the liner running tool in the deployment sleeve and reestablishing fluid communication between the liner running tool and the deployment sleeve;   i) injecting additional cement cleanout fluid through the liner running tool to move the liner wiper plug to the toe end of the liner and fill the liner upstream of the liner wiper plug with cement cleanout fluid; and,   j) releasing the liner running tool from the deployment sleeve and continuing to inject additional cement cleanout fluid to move contaminated cement up the wellbore within the annulus defined by the outside surface of the tubular member and inside surface of the production tubing.       
 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0059]      FIGS. 1   a - 1   e  are schematic diagrams of a prior art method for cementing a liner in place in a borehole; 
           [0060]      FIG. 2  is a schematic diagram of a liner wiper plug and a tubular member wiper dart positioned as they are injected, with the tubular member wiper dart being positioned to couple with liner wiper plug; 
           [0061]      FIGS. 3   a - 3   h  are schematic diagrams of various steps according to an embodiment of the present invention; 
           [0062]      FIG. 4  shows a method beginning with running the liner into the hole; 
           [0063]      FIG. 5  is the view of  FIG. 4  with the running tool released from the liner but still in sealing engagement to the liner; 
           [0064]      FIG. 6  shows the view of  FIG. 5  with cement delivered to a height above the running tool; 
           [0065]      FIG. 7  is the view of  FIG. 6  with the running tool picked up and the wiper plug flappers shut to allow circulation out of the excess cement with the liner isolated at the wiper plug; 
           [0066]      FIG. 8  shows the coiled tubing set back down to seal the running tool to the liner so that the wiper plug can be launched with applied coiled tubing internal pressure. 
       
    
    
     DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0067]    In the discussion of the Figures which follows, the same numbers will be used throughout to refer to the same or similar components. Various components are shown schematically which are otherwise considered to be well known to those skilled in the art for simplicity. 
         [0068]    The method and apparatus of the present invention are useful with coiled tubing or other tubular members used for cementing liners in position in boreholes, such as drillpipe. For illustration, the method and apparatus are shown and discussed by reference to a coiled tubing system working through production tubing. The use of the method and apparatus is essentially the same with or without the production tubing. 
         [0069]    In  FIGS. 1   a - 1   e  a prior art method for cementing a liner in a borehole is shown. The first step, shown as  FIG. 1   a , is the completion of a cased wellbore  10  which extends from an earth surface  12  to a subterranean formation and includes an outer casing  14 , a second casing  16  and a third casing  18  supported from a casing hanger  18   a . In many instances it may not be necessary to have three separate casings and it may be necessary to have more casings. Production tubing  20  is shown having an inside surface  20   a  and an outside surface  20   b . A packer  22  is shown in casing  16  and a bottom of production tubing  20  is shown at  24 . It is noted that it is not necessary to have production tubing  20  for the apparatus and method. A whipstock  26  has been used to drill a lateral open hole  28  through an opening  30  in casing  18 , which is typically milled through the casing using whipstock  26 . Coiled tubing  34  is shown having an outside  35 . A liner running tool  32  is shown attached to coiled tubing  34 . 
         [0070]    In  FIG. 1   b , a jointed pipe liner  36  has been conveyed into the open hole  28  by coiled tubing  34 . A liner running tool  32  and deployment sleeve  56  on a heel end of liner  36  serve to make the connection between the coiled tubing and the jointed pipe liner. A toe end  59  of liner  36  extends to near an end  61  of borehole  28 . A liner wiper plug  38  is positioned beneath liner running tool  32  as shown. The smaller arrows show fluid (mud) flow in the system. Drilling mud  44  is circulated through liner running tool  32  and coiled tubing  34  into liner  36 . The mud recovered is passed to recycle through a line  42  as shown. 
         [0071]    As the cementing process is conducted, as shown in  FIG. 1   c , cement  48  is passed through tubular member  34  to liner running tool  32  through liner wiper plug  38  and into liner  36  and then around the annular space surrounding liner  36  in open hole  28 . 
         [0072]    A cement cleanout fluid  50  is shown in tubular member  34  to push a coil tubing wiper dart  46  through tubular member  34  to force cement  48  downwardly through tubular member  34  and liner running tool  32 . When coil tubing wiper dart  46  encounters liner wiper plug  38 , it locks into position with liner wiper plug  38  and becomes blocking with respect to fluid flow through liner wiper plug  38  and into the inside of liner  36 . The combined wiper dart/wiper plug will now travel together down the liner. 
         [0073]    As shown in  FIG. 1   d , the cement is then pushed by the cement cleanout fluid  50  separated from the cement  48  by the combined wiper dart/plug downwardly through the liner to ultimate discharge as shown at toe end  61  at the end of open hole  28 . Cement discharged through a landing collar  58  at the toe end of the liner  36  passes upwardly through the annular space around the outside  39  of liner  36  and inside of borehole  28  and then upwardly into the production tubing through the annulus between the outside surface  35  of tubular member  34  and inside surface  20   a  of production tubing  20 . This results in the liner being filled with cement cleanout fluid which is unable to contact cement  48  outside liner  36  or to exit liner  36  at its toe end  59 . 
         [0074]    Flow can no longer occur down the liner because the liner wiper plug has landed in the landing collar and created a seal. 
         [0075]    At this point, as shown in  FIG. 1   e , liner running tool  32  is raised and additional cement cleanout fluid is injected to push excess cement through production tubing  20  to discharge as shown at line  42 . This is normally the completion of the cementing job using a tubular member which contains no wire or other obstruction. As previously indicated, the presence of a wire or any other obstruction makes it impossible to use the coil tubing wiper dart to accomplish this process. 
         [0076]    The cement cleanout fluid used is typically a material such as biopolymer but can be any fluid chosen by the operator. One suitable cement cleanout fluid for viscosity and suspension control in drilling operations is marketed by CP KELCO US, Inc. under the trademark BIOZAN. The term BIOZAN is identified by Hawleys Condensed Chemical Dictionary, revised by Richard J. Lewis, Sr., Van Nostrand Reinholt Company, New York, 12th Edition, page 147, as welan gum. 
         [0077]    In  FIG. 2  coil tubing wiper dart  46  is shown positioned with its lower mating guide  54  above liner wiper plug  38 , which has an arcuate lower end  40  and includes polymeric wiper surfaces as shown. As shown, coil tubing wiper dart  46  mates with liner wiper plug  38  at its upper end  38   a.    
         [0078]    In the practice of the present invention, for the embodiment shown in  FIG. 3   a , a tubular member  34  (which may be coiled tubing) containing a wire  60  (or other obstruction) is used to convey the liner  36  into the open hole  28 . Liner running tool  32 , capable of exhausting contaminated fluids to the annulus above top of liner  36 , is positioned on tubular member  34  and includes an extension  62  which runs through liner wiper plug  38 . Liner wiper plug  38 , with a mounting for shear pins  64 , is attached to the lower portion of deployment sleeve assembly  56 . A spring loaded cover  66  is attached to the upper end of liner wiper plug  38 . Liner running tool  32  is releasably attached to deployment sleeve  56  which has a connector  80  on its bottom end to attach to jointed pipe liner  36 . A neck or collar-type transition  37  as shown on  FIG. 3   b  provides a transition on the deployment sleeve  56  if the dimensions of the liner running tool  32  differ relative to those of the liner  36 . 
         [0079]    The wellbore shown in  FIG. 3   a  is otherwise substantially the same as that shown in  FIG. 1   a . As the cement job begins, as shown in  FIG. 3   b , the tubular member  34 , including wire  60 , which may be a single wire, a cable, a bundle of wires or the like may or may not be connected to the assembly discussed above. At this point, drilling mud  44  is being injected, as previously discussed, to pass downwardly through the liner around outside  39  of the liner and back up the production tubing by coil annulus to discharge to mud pits or the like, as shown by arrow  42 . 
         [0080]    An enlarged view of the liner running tool  32  apparatus connected to the end of tubular member  34  is shown in  FIG. 3   c.    
         [0081]    In  FIG. 3   d  cement injection has begun and cement is being passed through liner running tool  32  and liner wiper plug  38 . The cement has partially filled liner  36  and the space around liner  36  between an outside  39  of liner  36  and the inside of open hole  28 . The tubular member  34  includes an interface  70  between cement  48  and cement cleanout fluid  50 . At interface  70  some mixing will occur and some of the cement will be contaminated by the cement cleanout fluid so that it will not set. Similarly, at interface  52 , the cement cleanout fluid is in contact with drilling mud  44  positioned in tubular member  34 , although other fluids could also be used to push the cement cleanout fluid and cement into the open borehole  28  if desired. 
         [0082]    In  FIG. 3   e  the liner running tool  32  has been lifted from deployment sleeve  56  prior to injection of all of the cement past the running tool. It will be noted that upon withdrawal of extension  62  from liner wiper plug  38 , spring loaded cover  66  has closed. Accordingly at this point no fluids can pass into liner  36  past liner wiper plug  38 . Pumping is resumed down tubing member  34  and cement cleanout fluid  50  pushes cement contaminated with cleanout fluid  72  into the production tubing through the coil tubing annulus formed between the outside surface  35  of tubular member  34  and inside surface  20   a  of production tubing  20 . Further pumping down tubing member  34  places clean cement cleanout fluid  50  into the production tubing through such coil tubing annulus and moves contaminated fluid  72  up the production tubing and ultimately to discharge through line  42  to the rig pits or disposal. 
         [0083]    In  FIG. 3   f  the contaminated cement  72  has been pushed up production tubing  20  through such coil annulus as previously described and liner running tool  32  has been repositioned in deployment sleeve  56 . At this point, pressure is applied by increasing the pressure in coiled tubing  34  so that liner wiper plug  38  is broken free of shear pins  64  and begins to pass downwardly through liner  36 . 
         [0084]    In  FIG. 3   g  liner wiper plug  38  has reached toe end  59  of liner  36 . All of the cement has been pushed out of liner  3   b   6  into the annular space around liner  36  and some excess cement  72   b  has been pushed up to and past liner running tool  32 . 
         [0085]    At this point in  FIG. 3   h , liner running tool  3   b   2  is lifted and additional cement cleanout fluid is injected. This injected fluid pushes the now contaminated excess cement  72   b  and the contaminated cement  72  previously passed upwardly through production tubing  20  by the coil annulus previously described. During this operation, there is no flow in liner  36 . The presence of liner wiper plug  38  ensures that no flow of cement cleanout fluid passes plug  38 . The cement job is now complete. 
         [0086]    The tubular member used has been cleaned by the passage of the cement cleanout fluid and is now ready for use to drill an additional open hole or for other purposes requiring the wire bundle in the tubular member. Typically the tubular member includes a bundle of wires or a multi-conductor cable or the like. The elimination of the tubing coil change is a significant advantage and allows for expedited operation and greatly reduced costs. The use of the present method results in efficient and effective liner cementing jobs at a fraction of the previously necessary cost. 
         [0087]    The practice of the method is facilitated by use of an apparatus for cementing a liner in an open borehole extending from a wellbore and produced by drilling using a drilling apparatus including a tubular member having at least one obstruction in the tubular member, a body and configured for mating connection to the liner and including an extension having a passageway through the liner running tool and the extension and a liner wiper plug having an opening extending therethrough with the extension extending through the opening, a cover positioned on the liner wiper plug and adapted to cover the opening when the extension is withdrawn and a releasable retaining apparatus carried on the extension between the liner wiper plug and the body and adapted to releasably retain the liner wiper plug in a selected position in the liner. 
         [0088]    The liner running tool includes a body configured for mating connection with the liner. The liner running tool contains passageways to enable the discharge of excess cement and cement contaminated with cement cleanout fluid through the sides, bottom or top of the liner running tool into the production tubing by coiled tubing annulus with or without disengaging the liner running tool. Alternatively, the liner running tool may employ a device therein operable to close the passageway therein and discontinue fluid flow therethrough, such as by a mechanical, electrical, or hydraulically-operated valve. The liner typically includes, as a portion of the liner, a deployment sleeve shown at  56  which enables the liner running tool to be configured for mating engagement to the deployment sleeve in both a sealed or unsealed configuration as shown by seals  68 . The extension from the liner running tool includes a passageway through the liner running tool and the extension extends through the liner wiper plug having an opening extending therethrough with the extension extending through the opening. The apparatus also includes a cover positioned on the liner wiper plug and biased to cover the opening in the wiper plug when the extension is withdrawn and a releasable retaining apparatus carried on the extension between the liner wiper plug and the body or on the liner wiper plug. 
         [0089]    The releasable retaining apparatus may be carried on either the extension, the liner running tool, the deployment sleeve assembly or the liner wiper plug and is adapted to releasably retain the liner wiper plug in a preselected position in the liner. As noted previously the liner typically includes a deployment sleeve on its top end. The releasable retaining apparatus typically includes a plurality of shear pins mounted so that they can be sheared by the imposition of an additional pressure at a selected level on the closed liner wiper plug. Alternatively the releasable retaining apparatus may be electronically operated. This is accomplished as shown specifically in  FIG. 3   e  and  FIG. 3   f.    
         [0090]    The extension is typically at least partially retracted into the body as shown at  FIGS. 3   e - 3   h . This retraction is necessary to allow the liner running tool  32  to move back into engagement with deployment sleeve  56  for the operation shown in  FIG. 3   h.    
         [0091]    This apparatus is uniquely adapted to the performance of the method according to embodiments as previously described. The apparatus is adapted to accomplish the downhole operations necessary to enable the use of the wire-containing tubular member to perform the cementing job. The use of the this tool is specifically adapted to performing the required steps which must be performed in the order shown in order to achieve the desired result without contaminating fluids at inappropriate times and in inappropriate locations. 
         [0092]    The present invention as described above has enabled the use of tubular member containing at least one wire or other obstruction to accomplish cementing jobs which have previously required the use of a second tubular member containing no wire or obstruction. As mentioned previously, this is a substantial time and cost savings to oil field operations. 
         [0093]    The movement of the liner running tool, the selection of a discharge from the liner running tool through either the top, sides or bottom of the liner running tool, the closing of the liner wiper plug, the retention and release of the liner wiper plug and other related functions shown as mechanically or hydraulically performed can also be electronically performed and may be desirably performed electronically. The mechanical and hydraulic operation has been shown herein for simplicity. 
         [0094]    Referring to  FIG. 4  the hole  100  has been drilled with coiled tubing  120  and the bottom hole assembly (BHA, not shown) has been removed in a previous trip. In one example the hole  100  can be a lateral through a window in a main bore with a tubing tail  140  extending into the bore  100 . The coiled tubing  120  has electric line  160  still in it with a lower end  180  put at a distance from the running tool  200  by a few larger diameter collars  220 . The running tool  200  has a flow passage  240  that has an enlarged portion  260 . A stinger  280  has a through passage  300  is initially fixated with a shear pin  320 . The stinger  280  has a tail pipe  340  that extends through a passage  360  in wiper plug  380 . Flappers  400  and  420  are pivotally mounted to the wiper plug  380  and held open in  FIG. 4  by the extension of the tail pipe  340  in passage  360 . Shoulder  440  defines an upper travel stop for the stinger  280  in the enlarged portion  260 . 
         [0095]    The running tool  200  has a housing  460  that has external seals  480  to engage the liner  500  as well as a gripping mechanism  520  to engage groove  540  for run in and to selectively release from groove  540 , as shown in  FIG. 5  with the seals  480  still engaged. Housing  460  has a lower opening  560  through which tail pipe  340  extends for run in. The lower limit of travel for the stinger  280  is shown in  FIG. 5  where the lower end of the housing  460  around the opening  560  acts as the lower travel stop. Liner  500  has a deployment sleeve  580  internally secured with wiper plug  380  pinned to it with shear pin  600  housed within an aluminum insert retained at bottom of deployment sleeve  580 . 
         [0096]    The various parts of the apparatus now having been identified, the operation of the tool will be reviewed in greater detail. In  FIG. 4  the coiled tubing  100  with the electric line  160  still inside are rigged up to the liner  500  to run it to the hole bottom. Once at hole bottom, the liner  500  is released at  540  from the grip mechanism  520 . This is typically done with a ball landed on a seat and pressure buildup, none of which is shown, but is a well known technique for releasing a liner from a running tool. As shown in  FIG. 5  the coiled tubing  100  is lifted only enough to determine that running tool  200  has released from liner  500 . Note that the seals  480  still engage the interior of the liner  500  and flappers  400  and  420  are still held open by tail pipe  340 . Referring now to  FIG. 3  cement  62  is delivered down the coiled tubing  10  up to a level  64 . The cement fills the enlarged volume  260  and goes into the liner  500  through the tail pipe  340  and past the held open valves  400  and  420  as indicated by arrow  660 . Arrows  680  indicate the direction of fluid displaced from the annulus as some of the cement goes out the bottom of the shoe (not shown) at the lower end of the liner  500 . The reason extra cement is used up to a level  640  is to insure that the cement that gets beyond the flappers  400  and  420  is not contaminated by fluid  700  delivered behind the cement  620  to spot it into the  FIG. 6  position. Now with the assurance that the cement below the wiper plug  380  is not contaminated, the coiled tubing  100  is lifted raising the stinger  280  and with it the tail pipe  340  above both flappers  400  and  420  so that they can be biased along their pivot axis to the closed position shown in  FIG. 7 . Note that the seals  480  are now out of the liner  500 . Circulation through the coiled tubing  100  represented by arrows  700  removes the excess cement  720  without raising the circulation pressure to the point of breaking the shear pin  600  that retains the wiper plug  380  to the deployment sleeve  580 . The cement  620  below the wiper plug  380  is isolated from the circulating fluid by the two flappers  400  and  420 . Note that pin  320  holding the stinger  280  to the housing  460  has not yet been sheared. With the excess cement circulated out,  FIG. 8  shows setting down weight on the coiled tubing  100  so that the running tool  200  bottoms on the deployment sleeve  580 . Seals  480  go back inside liner  500  and set down weight of the coiled tubing  100  results in breaking of shear pin  320  as the tail pipe  340  lands on closed valve  400  as the running tool  200  descends moving the tailpipe  340  and stinger  280  up inside the housing  460  to its travel stop at  440 . Arrow  740  represents applied pressure that will break the shear pin  600  to launch the wiper plug  380  because valves  400  and  420  are closed. Arrow  760  represents cement coming through the shoe (not shown) at the bottom of the liner  500  and into the surrounding annulus to finish the cementing job. The pressure  740  can also drive the stinger  280  to its travel stop  440 . The coiled tubing  100  is now removed and the running tool  200  and the stinger  280  come out with it. The aluminum insert is subsequently milled out to allow passage of future services tools. 
         [0097]    Those skilled in the art will appreciate that the coiled tubing with electric line can now do double duty. The wiper plug can have one or more valves of different designs. The excess cement delivery is optional but helps to confirm that the tail end of the cement delivered below the wiper plug is not contaminated by the fluid behind it that delivered it. Alternatively the running tool can have a ported sleeve to allow excess cement to be circulated out. In broad terms the invention allows the reuse of electric line coiled tubing to cement after the same coiled tubing is used to make the hole. This saves the operator significant sums of money by not needing a second coiled tubing reel to be retained on site. Other modes of delivering the sealing material past the plug and then closing off the plug so it can be launched are contemplated. With the electric line in the coiled tubing, delivering a sealing member through the coiled tubing is challenging but is an alternative mode of operation contemplated by the present invention. 
         [0098]    While the present invention has been described by reference to certain of its preferred embodiments, it is pointed out that the embodiments described are illustrative rather than limiting in nature and that many variations and modifications are possible within the scope of the present invention. Many such variations and modifications may be considered obvious and desirable by those skilled in the art based upon a review of the foregoing description of preferred embodiments.