Abstract:
The tubular cutting tool for severing downhole tubulars, the tool having a drive system, a pivoting system, a cutting head, a cutting member, and a lubricant delivery system. Cutting may be accomplished by rotatingly actuating the cutting head with an associated motor and extending the cutting member away from the cutting head. The lubricant delivery system lubricates the respective contacting surfaces of the cutting member and the tubular and is actuated when the cutting member extends from the cutting head.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a continuation-in-part of and claims priority from co-pending U.S. Application having Ser. No. 11/728,461, filed Mar. 26, 2007, the full disclosure of which is hereby incorporated by reference herein. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The disclosure herein relates generally to the field of severing a tubular member. More specifically, the present disclosure relates to an apparatus for cutting downhole tubulars. Yet more specifically, described herein is a method and apparatus for optimizing cutting tubulars wherein lubrication is maintained between the cutting member and the tubular. 
         [0004]    2. Description of Related Art 
         [0005]    Tubular members, such as production tubing, coiled tubing, drill pipe, casing for wellbores, pipelines, structural supports, fluids handling apparatus, and other items having a hollow space can be severed from the inside by inserting a cutting device within the hollow space. As is well known, hydrocarbon producing wellbores are lined with tubular members, such as casing, that are cemented into place within the wellbore. Additional members such as packers and other similarly shaped well completion devices are also used in a wellbore environment and thus secured within a wellbore. From time to time, portions of such tubular devices may become unusable and require replacement. On the other hand, some tubular segments have a pre-determined lifetime and their removal may be anticipated during completion of the wellbore. Thus when it is determined that a tubular needs to be severed, either for repair, replacement, demolishment, or some other reason, a cutting tool can be inserted within the tubular, positioned for cutting at the desired location, and activated to make the cut. These cutters are typically outfitted with a blade or other cutting member for severing the tubular. In the case of a wellbore, where at least a portion of the casing is in a vertical orientation, the cutting tool is lowered into the casing to accomplish the cutting procedure. 
     
    
     BRIEF SUMMARY OF THE INVENTION 
       [0006]    Disclosed herein is a cutting tool and method wherein lubrication is delivered during cutting. The system employs a rotating blade and a lubrication system for dispensing lubrication between the blade&#39;s cutting surface and the tubular to be cut. Optionally an isolation material may be included for retaining the lubrication in the cutting region. An example of a cutting tool includes a housing, a cutting member having a stowed position within the housing and a cutting position in cutting contact with the tubular, lubricant stored in a reservoir in the housing, a lubricant dispensing system having an inlet in fluid communication with the reservoir, an exit on the lubricant dispensing system that is sealed when the cutting member is in the stowed position, and open when the cutting member is in the cutting position, so that when the cutting member is in the cutting position lubricant can flow from the reservoir, through the lubricant dispensing system, and from the exit into the space between the cutting member and the downhole tubular. The cutting tool may optionally have a pressure source in pressure communication with the lubricant in the reservoir, so that when the exit on the lubricant dispensing system is open the lubricant is urged from the reservoir and out the exit. The cutting tool can also further include isolation material in a reservoir in the housing, a selectively openable passage between the reservoir and annulus between the cutting tool and the tubular, so that when the passage is opened the isolation material flows from the reservoir into the annulus to form a barrier hindering the lubricant from flowing away from the area where the cutting member contacts the tubular. A conduit may be in the cutting tool between the inlet and exit; also included can be a fastener coaxially coupled with the cutting member, wherein the exit mates with the fastener when the cutting member is in the stowed position to form a seal at the exit, and when the cutting member is in the cutting position the fastener is moved away from the exit thereby removing the seal from the exit allowing lubricant to flow through the conduit and out of the exit. A sealing plug may be slidingly disposed within the conduit that forms a seal in the conduit along its length and is pushed from the conduit by the lubricant when the seal is removed. The lubricant dispensing system can be a frangible conduit having an inlet in fluid communication with the reservoir, wherein the conduit is positioned so that when the cutting member moves from its stowed position to its cutting position it cutting contacts the frangible conduit to form an opening for lubricant to exit. Alternatively, the lubricant dispensing system includes a conduit depending from the exit, a sealing surface in the conduit, a seal element in the conduit in selective sealing engagement with the sealing surface, a portion of the seal element protruding past the exit and in the cutting member path as it moves from its stowed to cutting position, so that when the cutting member moves into its cutting position it contacts the seal element to push it away from the sealing surface to provide a fluid communication path between the reservoir and the exit. The cutting tool can be suspended from the surface on a conveyance member attached to the housing; a motor may be included in the housing coupled to the cutting member, and an anchor can be coupled with the housing having a deployed position in anchoring contact with the tubular. An electrical power supply can be provided at the surface connected to the conveyance member and a conducting member included between the conveyance member and the motor, so that power from the electrical power supply powers the motor. 
         [0007]    Also disclosed herein is a method of cutting a downhole tubular that includes providing a tubular cutting device that includes a body, a cutting member moveable along a path from a stowed position within the body to a cutting position outside of the body, a supply of lubricant in the body, a lubricant dispensing system in fluid communication with the lubricant having a selectively openable exit, deploying the cutting device within the tubular; contacting the portion of the dispensing system with the cutting member by moving the cutting member from the stowed position to the cutting position, selectively opening the dispensing system exit with the cutting member so that lubricant flows from the exit and in the space adjacent the portion of the tubular to be cut, rotating the cutting member, and contacting the tubular with the rotating cutting member with the lubricant between the cutting member and the tubular. 
     
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
         [0008]      FIG. 1 . is a side view of an embodiment of a cutting tool in a tubular. 
           [0009]      FIG. 2  is a side view of an alternative embodiment of a cutting tool in a tubular. 
           [0010]      FIG. 3  is a side view of an alternative embodiment of a cutting tool in a tubular. 
           [0011]      FIG. 4   a  is a side view of a cutting tool having a lubrication system. 
           [0012]      FIG. 4   b  is a magnified side view of a cutting tool with a lubrication system. 
           [0013]      FIG. 5  is an overhead view of a cutting blade having lubrication delivery ducts. 
           [0014]      FIG. 6  is a partial cut away view of a cutting tool disposed in a cased wellbore. 
           [0015]      FIG. 7  depicts in a perspective view a cutting tool with a lubricant sub. 
           [0016]      FIGS. 8A ,  8 B,  9 A, and  9 B depict in side schematic view a cutting member extending towards a cutting position and opening a discharge port for a lubricant. 
           [0017]      FIG. 10  illustrates a side schematic view of an example of a cutting member moving into contact with a frangible conduit. 
           [0018]      FIGS. 11 and 11A  provide side schematic depictions of a cutting member moving into activating contact with a lubricant dispensing system. 
           [0019]      FIGS. 12A and 12B  depict in side sectional views an example of a lubricant dispensing system for use with a cutting tool. 
           [0020]      FIG. 13  provides a perspective view of an example of a cutting tool with a cover. 
           [0021]      FIGS. 14A-14C  and  15 A- 15 B depict in perspective and sectional views an example of a lubricant dispensing system for use with a cutting tool. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0022]    The method and system of the present disclosure will now be described more fully hereinafter with reference to the accompanying drawings in which embodiments are shown. The method and system of the present disclosure may be in many different forms and should not be construed as limited to the illustrated embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be through and complete, and will fully convey its scope to those skilled in the art. Like numbers refer to like elements throughout. 
         [0023]    It is to be further understood that the scope of the present disclosure is not limited to the exact details of construction, operation, exact materials, or embodiments shown and described, as modifications and equivalents will be apparent to one skilled in the art. In the drawings and specification, there have been disclosed illustrative embodiments and, although specific terms are employed, they are used in a generic and descriptive sense only and not for the purpose of limitation. Accordingly, the improvements herein described are therefore to be limited only by the scope of the appended claims. 
         [0024]    Described herein is a method and apparatus for cutting and severing a tubular. While the apparatus and method described herein may be used to cut any type and length of tubular, one example of use involves severing tubing disposed within a wellbore, drill pipe, wellbore tubular devices, as well as wellbore casing. One embodiment of a cutting tool  10  as described herein is shown in side partial cut away view in  FIG. 1 . In this embodiment, the cutting tool  10  comprises a body  11  disposed within a tubular  5 . As noted, the tubular  5  may be disposed within a hydrocarbon producing wellbore, thus in the cutting tool  10  may be vertically disposed within the wellbore tubular. Means for conveying the cutting tool  10  in and out of the wellbore include wireline, coiled tubing, slick line, among others. Other means may be used for disposing the cutting tool  10  within a particular tubular. Examples of these include drill pipe, line pigs, and tractor devices for locating the cutting tool  10  within the tubular  5 . 
         [0025]    Included within the body  11  of the cutting tool  10  is a cutting member  12  shown pivotingly extending out from within the body  11 . A lubricant  18  is shown (in cross hatch symbology) disposed in the cutting zone  22  formed between the outer surface of the tool  10  and the inner surface  6  of the tubular  5 . For the purposes of discussion herein, the cutting zone  22  is designed as the region on the inner circumference of the tubular, as well as the annular space between the tool and the tubular proximate to the portion of the tubular that is being cut by the cutting tool. Examples of lubricants include hydrogenated polyolefins, esters, silicone, fluorocarbons, grease, graphite, molybdenum disulfide, molybdenum sulfide, polytetrafluoroethylene, animal oils, vegetable oils, mineral oils, and petroleum based oils. 
         [0026]    Lubricant  18  inserted between the cutting member  12  and the inner surface  6  enhances tubular machining and cutting. The lubricant  18  may be injected through ports or nozzles  20  into the annular space between the tool  10  and the tubular  5 . These ports  20  are shown circumferentially arranged on the outer surface of the tool housing  11 . The size and spacing of these nozzles  20  need not be arranged as shown, but instead can be fashioned into other designs depending upon the conditions within the tubular as well as the type of lubricant used. As discussed in more detail below, a lubricant delivery system may be included with this device for storing and delivering the lubricant into the area between the cutting member and the tubular inner surface  6 . In many situations when disposing a cutting tool within a tubular, especially a vertically oriented tubular, lubricants may be quickly drawn away from where they are deposited by gravitational forces. Accordingly, proper lubrication during a cutting sequence is optimized when lubrication is maintained within the confines of the cutting zone  22 . 
         [0027]    Additional ports  16  are shown disposed on the outer surface of the housing  11  for dispensing an isolation material  14  into the space between the tubular  5  and the tool  10 . The lubricant port  20  location with respect to the isolation port  16  location enables isolation material  14  to be injected on opposing sides of the lubricant  18 . Isolation material  14  being proximate to and/or surrounding the lubricant  18  retains it within or proximate to the cutting zone  22 . Referring again to  FIG. 1 , isolation material  14  is disposed in the annular space between the tool  10  and the tubular  5  and on opposing ends of the lubricant  18 . Thus the isolation material should possess sufficient shear strength and viscosity to retain its shape between the tool  10  and the tubular and provide a retention support for the lubricant  18 . 
         [0028]    Examples of isolation materials include a gel, a colloidal suspension, a polysaccharide gum, xanthan gum, and guar gum. One characteristic of suitable isolation material may include materials that are thixotropic, i.e. they may change their properties when external stresses are supplied to them. As such, the isolation material should have a certain amount of inherent shear strength, high viscosity, and surface tension in order retain its form within the annular space and provide a retaining force to maintain the lubricant in a selected area. Thus, as shown in  FIG. 1 , the presence of the isolating material on opposite sides of the lubricant helps retain the lubricant within the cutting zone. 
         [0029]    An alternative embodiment of a cutting tool  10 A within a tubular  5  is provided in side partial cross sectional area in  FIG. 2 . In this embodiment, nozzles  16  are shown circumscribing the body  11 A outer surface along a single axial location on the tool  10 A. Optionally, in this situation, the nozzles  16  could be disposed on a side of the lubrication nozzles  20  opposite the cutting member  12 . 
         [0030]    Shown in a side partial sectional view in  FIG. 3  is another embodiment of a cutting tool  10 B coaxially deployed within a tubular  5 . In this embodiment the cutting member  12 B is a straight blade affixed to a portion of the body  11 B. Although in this embodiment a single set of nozzles  16  is shown for disposing isolation material  14  into the annular space between the cutting tool  10 B and the inner surface  6  of the tubular  5 , multiple sets of nozzles can be included with this embodiment along the length of the cutting tool  10 B. As shown, the lubricant  18  has been injected into the tubular  5  between the tool  10 B and the tubular inner surface  6 . Thus, the cutting zone  22  includes lubrication for enhancing any machining or cutting by the tool  10 B. Isolation material  14  is also injected into the annular space between the tool  10 B and the tubular thereby providing a retaining support for the lubricant  18 . 
         [0031]    Another embodiment for delivering lubrication to a cutting surface is provided in  FIGS. 4A and 4B . Here an example is provided of delivering a lubricant  18  to the cutting surface of a cutting blade by installing conduits within the blade itself. Shown in side partial sectional view in  FIG. 4A  is a cutting tool  10 C within a tubular  5  having a blade like cutting member  12 C radially extending from the body  11 C. Rotating the cutting tool  10 C while urging the cutting member  12 C into contact with the inner surface  6  cuts into the tubular  5 , and eventually severs the tubular  5 . Lubricant  18  is provided within a lubricant reservoir (not shown) disposed in the body  11 C. The reservoir is in fluid communication with the cutting member  12 C via supply line  24  shown extending into the cutting member  12 C. Lubricant  18  flows from the reservoir through the supply line  24  and exits the cutting member  12 C through a nozzle exit  26  formed at the supply line  24  terminal end. When discharged from the supply line  24 , the lubricant  18  enters the annular space between the cutting member  12 C and the inner surface  6 . This places the lubricant  18  on the cutting surface  27  of the cutting member  12 C reducing cutting friction thereby enhancing cutting operations. Lubricant  18  may be constantly supplied out into the nozzle exit  26  during a tubular  5  cutting procedure. 
         [0032]      FIG. 5  provides an overhead view of one example of a cutting member  12 C that includes a blade  29  having conduits formed within its surface for delivering lubricant  18  to a cutting surface. In this embodiment, the cutting member  12 C includes inlays  28  on the blade  29 . Rotating the blade  29  about its axis A X  and contacting a tubular with the moving inlays  28  can cut and sever a tubular. Lubricant supply lines  30 , shown in dashed outline, extend linearly along the blade  29  in opposite directions from the blade axis A X . The supply lines  30  terminate at exit nozzles  31  proximate each inlay  28 . Optimization of machining or cutting a tubular can occur by injecting lubricant from the exit nozzles  31  so lubricant is on the cutting surface during cutting. Optionally a nozzle could be formed on an inlay  28  so that lubricant  18  is added during the entire cutting sequence and is present between the cutting blade  29  and the cutting surface. For the purposes of discussion herein, cutting surface can be a surface in cutting contact, this includes the tubular inner surface  6  where it is being contacted by a cutting member as well as any portion of a cutting member or blade contacting a tubular during cutting. 
         [0033]      FIG. 6  provides a partial side cut away view of an embodiment of a cutting system used in cutting a tubular  7 . In this embodiment a cutting tool  10 D is shown deployed from a conveyance member  8  into a cased wellbore  4  that intersects a subterranean formation  2 . The tubular  7  is coaxially disposed within the wellbore casing. Optionally, the cutting tool  10 D may be employed for cutting the wellbore casing and used in the same fashion it is used for cutting the tubular  7 . Examples of means used in deploying the tool  10 D in and out of the wellbore  4  by the conveyance member  8  include wireline, slick line, coil tubing, and any other known manner for disposing a tool within a wellbore. Shown included with the cutting tool  10 D is a controller  38 , a lubricant delivery system  40 , an isolation material delivery system  46 , and a cutting member  12 . The controller  38 , which may include an information handling system, is shown integral with the cutting tool  10 D and may be used for its control. The controller  38  may be configured to have preset commands stored therein, or can receive commands offsite or from another location via the conveyance member  8 . An optional anchoring system  32  is shown having anchor legs extending outward from the cutting tool  10 D into anchoring contact with the tubular  7  inner surface. 
         [0034]    The lubricant delivery system  40  can be employed to deliver lubricant  18  within the space between the cutting member  12  and tubular  7 . The delivery system  40  shown includes a lubricant pressure system  42  in communication with a lubricant reservoir  44 . The pressure system  42  is adapted for conveying lubricant  18  from within the reservoir  44  through the tool  10 D and into the annular space between the cutting tool  10 D and the tubular  7  and adjacent the cutting member  12 . The pressure system  42  may be spring loaded, a motor driven pump, or include pressurized gas. 
         [0035]    Further depicted with the cutting tool  10 D of  FIG. 6  is an isolation material pressure supply  48  and an isolation material reservoir  50  that are included with the isolation material delivery system  46 . The isolation material pressure supply  48 , which can have a pump, spring loaded device, or compressed gas, may be used in urging isolation material  14  from within the isolation material reservoir  50  and out into the annular space between the tool  10 D and the tubular  7 . It should be pointed out that the isolation material  14  and lubricant  18  can be simultaneously ejected from the cutting tool  10 D. Optionally either the isolation material  14  or lubricant  18  may be delivered into the annular space before the other in sequential or time step fashion. As far as the amount of lubricant  18  or isolation material  14  delivered, it depends on the cutting tool  10 D and/or tubular  7  dimensions; it is believed it is well within the capabilities of those skilled in the art to design a system for delivering a proper amount of lubricant  18  as well as isolation material  14 . 
         [0036]    As shown with the embodiment of  FIG. 6 , the cutting member is in a cutting sequence for cutting the tubular  7  and isolation material  14  is shown retaining a quantity of lubricant  18  adjacent the cutting member  12  thereby maintaining the lubricant  18  in the space between the cutting member and the tubular  7 . A controller  34  disposed at surface may be employed for relaying commands to or otherwise controlling the cutting tool  10 D. The controller  34  may be a surface truck (not shown) disposed at the surface as well as any other currently known or later developed manner of controlling a wellbore tool from the surface. Included optionally is an information handling system  36  that may be coupled with the controller  34  either in the same location or via some communication either wireless or hardwire. Also illustrated schematically is a power supply  35  shown disposed on the surface above the wellbore  4  and in communication with the conveyance member  8 . The power supply  35  can selectively provide power to the cutting tool  10 D via the conveyance member  8  that can be used for controls and/or motors within the tool  10 D. 
         [0037]    It should be pointed out that the exit nozzles can have the same cross sectional area as the supply lines leading up to these nozzles, similarly other types of nozzles can be employed, such as a spray nozzle having multiple orifices, as well as an orifice type arrangement where the cross sectional area at the exit is substantially reduced to either create a high velocity stream or to atomize the lubricant for more dispersed application of a lubricant. 
         [0038]    Referring now to  FIG. 7 , provided therein is a side perspective and partial sectional view of an embodiment of a cutting tool  52 . The cutting tool  52  shown is a generally elongated member having a cylindrical outer body or housing  54 . Within the housing  54  is a motor  56  coupled to a circular cutting member  58  on its lower end. A fastener  60  couples on the cutting member  58  lower surface coaxial with the cutting tool  52 . The fastener  60  may be a nut that is screwed onto a shaft (not shown) extending from the motor  56 . Optionally, a gearing system (not shown) may mechanically connect the motor  56  and cutting member  58 . 
         [0039]    Below the cutting member  56  the housing  54  tapers into a frusto-conical section to define a nose portion  62 . A bore  64  is shown axially formed through the nose portion  62  and in alignment with the fastener  60 . A cylindrically shaped nozzle  66  is disposed in the bore  64  having an upper end in contact with the fastener  60  lower surface. The nozzle  66  lower most end juts into a cylindrically shaped lubricant sub  70  that is attached along the conically contoured nose portion  62  outer surface. The lubricant sub  70  is shown in sectional view as a generally hollow member having on its upper end a cylindrically shaped plug  72  that abuts the nose portion  62  lower end. A ferrule  74  shown coaxially within the plug  72  registers with a passage  68  coaxially formed through the nozzle  66 . A reservoir  76  is defined within an open space in the sub  70  that is below the plug  72 . Lubricant may be stored in the reservoir  76  for injection between the cutting member  58  and a tubular inner surface. As noted above, injection of the lubricant onto a cutting surface enhances the cutting deficiency of a cutting tool. 
         [0040]    In the embodiment of  FIG. 7  a pressure source is provided within the lubricant sub  70  depicted as a combination of a piston  78  and spring  80 . The piston  78  illustrated is a cylindrical element defining the reservoir  76  lower periphery. The spring  80 , which coils helically along the inner circumference of the sub  70 , has a lower end in contact with the lower most surface of a sub  70  in an upper end in contact with the piston  78 . Thus as lubricant is expelled from the reservoir  76  the spring  80  expands to urge the piston  76  upwards in the direction of the plug  72 . Other pressure means may be employed, such as compressed gas, an expandable bladder, and selectively openable ports adapted to receive wellbore fluid therein. 
         [0041]      FIGS. 8A and 8B  provide an enlarged view of a portion of the cutting tool  52  where it couples with the lubricant sub  70 . In these views shown is the passage  68  coaxially formed within the nozzle  66  and how it registers with a dispensing line  75  coaxially formed through the ferrule  74 . The combination of the dispensing lines  75  and passage  68  form a conduit adapted for flowing lubricant within the reservoir  76  out into the cutting space between the cutting member  58  in the tubular. More specifically, in  FIG. 8A  the nozzle  66  upper end is depicted in sealing contact with the fastener  60  bottom blocking the passage  68  exit. 
         [0042]    Shown in  FIG. 8B  the cutting member  58  is moving into a cutting position by pivoting radially outward breaching sealing contact between the fastener  60  and nozzle  66  exit. Therefore lubricant within the reservoir  76  now has a clear path from the nozzle  66  exit and can flow from the reservoir, through the conduit, and out of the nozzle  66  exit. Once past the nozzle  66  exit the lubricant can make its way to between the cutting member  58  and tubular. A resilient member  69  is shown in the space between the nozzle  66  and ferrule  74  that provides an outwardly urging force maintaining the sealing contact between the nozzle  66  exit and fastener  60 . In an example the resilient member may be a spring. 
         [0043]      FIGS. 9A and 9B  respectively represent side schematic depictions of a cutting member  58  in a stowed position within the housing  54  and in a cutting position in cutting contact with a tubular. The cutting tool  52  embodiments shown in  FIGS. 9A and 9B  includes a dispensing line  75  representing a conduit for communicating fluid between the reservoir  76  and lubricant exit. The dispensing line  75  exit is shown in sealing contact with the fastener  60  lower surface. Further provided in the embodiments of  FIGS. 9A and 9B  is a sealing plug  77  slidingly disposed within the dispensing line  75 . The presence of the sealing plug  77  enhances the pressure seal between the lubricant within the reservoir  76  and ambient the dispensing line  75 . Referring now to  FIG. 9B , the cutting member  58  and fastener  60  have moved radially outward from the tool  52  axis A X  thereby removing contact between the exit from the dispensing line  75  and fastener  60 . This opens the dispensing line exit  75  allowing the flow of lubricant from the reservoir  76 , represented by arrows, through the dispensing line  75  and into the ambient space, where it can make its way or be directed into the space between the cutting element and tubular. 
         [0044]    A schematic of an alternate cutting tool  52 A is provided in a side sectional view in  FIG. 10 . In this embodiment, a lubricant reservoir  76  within the housing  54  is shown containing lubricant L providing a lubricant supply. A dispensing line  75 A provides fluid communication between the lubricant reservoir  76  and a frangible tube  82  shown disposed in the path between the cutting member  58  stowed position and its cutting position. The frangible tube  82  is formed from a material that can be ruptured or otherwise severed by cutting contact with the cutting member  58 . Moreover, the frangible tube  82  has a sealed terminal end. In the embodiment of  FIG. 10 , the end is attached to a solid portion of the body  54 . Optionally, the frangible tube  82  can stand freely in the cutting member  58  path and have a closed end rather than attached to the body  54 . In the embodiment of  FIG. 10 , the cutting member  58  which is in cutting rotation, cuts the frangible tube  82  to form an opening. The opening cut into the frangible tube  82  provides an exit for lubricant L within the reservoir  76  to be dispensed into the space outside of the housing  54  and onto the surface of the tubular to be cut by the cutting member  58 . 
         [0045]    Shown in a side schematic partial sectional view in  FIG. 11  is an alternate example of a cutting tool  52 B in accordance with the present disclosure. In the embodiment of  FIG. 11  a dispensing unit  86  is shown in fluid communication with a dispensing line  75 B connected on an upstream end to the lubricant reservoir  76 . Contact between the cutting member  58  and a protruding portion of the dispensing unit  86  opens a fluid path between the lubricant reservoir  76  and the area outside the housing  54 .  FIG. 11A  shows in a side sectional view, an enlarged view of the dispensing unit  86  and its interaction with the cutting member  58 . The dispensing unit  86  includes a cylindrical hollow outer housing  88 , a spherical seal plug member  90  within the housing  88 , an annular lip  91  on the exit portion of the housing  88 , and a spring  92  in urging contact against the seal plug member  90  on the side opposite the annular lip  91 . 
         [0046]    Referring back to  FIG. 11 , a portion of the seal plug member  90  protrudes past the remaining elements in the dispensing unit  86 . In this configuration, the seal plug member  90  contacts the inner radius of the annular lip  91  urged upward by the spring  92  to create a sealing surface between the seal plug member and annular lip  91 . The dispensing unit  86  shown is configured so that a portion of the seal plug member  90  protrudes into the cutting member  58  path. Thus, as the cutting member  58  moves into its cutting position from its stowed position, it contacts the seal plug member  90  pushing it further inside the housing  88  and depressing the spring  92 . This unseats the seal plug member  90  from the annular lip  91  allowing lubricant from within the reservoir  76  to exit from within the housing  54 . 
         [0047]    Shown in a side sectional view in  FIGS. 12A and 12B  is another embodiment of a lubricant to cutting surface delivery system. With reference to  FIG. 12A , a bore  64 C extends through the nose portion  62  between the reservoir  76  and cavity  63  within the cutting tool  52 C. A threaded plug  65  is fastened within an end of the bore  64 C adjacent the reservoir  76 . An elongated piston like sealing plug  77 C is slidingly provided within the bore  64 C having a portion shown extending outside the bore  64 C and into the cavity  63 . The sealing plug  77 C outer surface is scored on its outer circumference to form a notch  79  and its upper end terminates at the fastener  60  lower surface. An extension  61  is shown depending downward from the fastener  60  lower surface to below the sealing plug  77 C upper end. 
         [0048]    Both the bore  64 C and sealing plug  77 C diameters transition from a larger to a smaller diameter. In the configuration of  FIG. 12A , the respective diameter transitions are at different locations to form an annular space  73  around a portion of the smaller diameter section of the sealing plug  77 C. Also in the bore  64 C is a spring  67  shown between the threaded plug  65  and sealing plug  77 C that forces the sealing plug  77 C upper end against the fastener  60 . Also included in this embodiment is a passage  71  bored through the nose portion  64 C with an end in fluid communication with the reservoir  76  and an opposite end connecting to the dispensing line  75 C. The dispensing line  75 C has an exit proximate the cutting member  58 . The passage  71  intersects the bore  64 C along a portion in which the plug  77 C is disposed. In the embodiment of  FIG. 12A , a seal is formed along the area where the sealing plug  77 C contacts the passage  71  that blocks fluid communication between the reservoir  76  and dispensing line  75 C. 
         [0049]    As the blade  58  is rotated and pivoted radially outward from the cavity  63 , the attached extension  61  collides with the sealing plug  77 C and applies a sufficient moment arm to fracture the sealing plug  77 C along the notch  79 . Referring now to  FIG. 12B , removing the portion of the sealing plug  77 C above the notch  79 , allows the spring  67  to expand and upwardly urge the remaining section of sealing plug  77 C. This unseats the seal between the sealing plug  77 C and passage  71  thereby allowing lubricating fluid within the reservoir  76  to be communicated through the passage  71 , to the dispensing line  75 C, and then delivered to a cutting surface. The sealing plug  77 C is prevented from being ejected from the bore  64 C by contact between the diameter transitions on the bore  64  and sealing plug  77 C, thus eliminating the annular space  73 . 
         [0050]    The present disclosure further includes using a cutting tool with a lubricant to cut tubulars with increased chrome amounts, as well as alloying elements such as nickel, vanadium, molybdenum, titanium, silicium. This method is also applicable to cutting in environments with water, salt water, and drilling fluids. 
         [0051]    A cover  55  may be provided with an embodiment of the cutting tool  52 D for retaining grease within the tool  52 D. Shown in perspective view in  FIG. 13 , the cover  55  envelops a portion of the cavity  63  where the blade  58  is deployed. The cavity  63  can be packed with grease prior to being deployed and the cover  55  put in place thereby retaining the grease in the cavity  63  and on the blade  58  while the tool  52 D is being lowered downhole. The cover  55  is shown hinged on an end to the housing  54 D so that it can swing open and not impede the blade  58  as it is pivoted radially outward. Selectively opening the cover  55  during cutting enables grease to also migrate to the cutting surface. The cover  55  may be biased, such as with a spring or like member, so that it follows the blade  58  and closes over the cavity  63  as the blade  58  is re-stowed within the housing  54 D). 
         [0052]    In an optional embodiment shown in  FIGS. 14A-15B , grease and/or lubricant from a reservoir on one side of the cutting blade  58  can be dispensed to an opposite side of the blade  58 . Shown in a partial sectional perspective in  FIG. 14A , a section of the nose portion  62 E of the cutting tool  52 E projects past the cutting blade  58  having an end terminating at a blade mount  93 . The blade mount  93  shown houses a portion of a shaft  94  for rotating the cutting blade  58  and gears for driving the shaft  94 . A pivot shaft  95  couples within the blade mount  93 , that when rotated pivots the blade mount  93  and blade  58 . In the cutting tool  52 E example of  FIGS. 14A-14C , when the tool  52 E is being deployed and the cutting blade  58  is stowed, the sealing plug  77 E end opposite the spring  73  is urged against the fastener  60  by the spring  73 . Grease and/or lubricant may be introduced into the reservoir  76 E via an inlet port  83  disposed in a lateral bore  85  formed radially inward into the nose portion  62 E. An axial bore  87  intersects the lateral bore  85  to communicate grease and/or lubricant injected into the port  83  to the reservoir  76 E. The lateral bore  85  as shown intersects the passage  71 E. 
         [0053]    A channel  81  is provided on the blade mount  93  on a side of the cutting blade  58  opposite the reservoir  76 E ( FIG. 14B ). The channel  81  registers with the passage  71 E discharge side and extends along the blade mount  93 . The other end of the channel  81  terminates between the blade  58  outer periphery and mid section in communication with the side of the blade  58  opposite the reservoir  76 E. Thus lubricant and/or grease can be dispensed onto the cutting blade  58  by flowing it from reservoir  76 E, into the passage  71 E, and through the channel  81 .  FIG. 14C  provides a sectional view of the cutting tool  52 E taken along its axis on the reservoir  76 C side of the cutting blade  58 . The section of the nose portion  62 E extending past the blade  58  has a width that tapers along its circumference thereby forming a crescent shape. The wider section of the nose portion  62 E is disposed proximate and perpendicular to the pivot shaft  95 . The wider section also includes the passage  71 E discharge; thus as shown, the passage  71 E discharge is proximate to the pivot shaft  95 . 
         [0054]      FIGS. 15A and 15B  provide side and axial sectional views of the cutting tool  52 E in a cutting position. The section of the nose portion  62 E extending past the blade  58  encircles less than half the blade  58 ; this leaves an open space allowing the blade  58  to pivot radially outward into cutting contact with a tubular. Because the passage  71 E discharge is aligned with the pivot shaft  95 , the passage  71 E remains registered with the channel  81  while the blade mount  93  and blade  58  are being pivoted into cutting contact. Thus as the blade  58  spins during a cutting procedure, grease and/or lubricant can be deposited on its side and delivered to the cutting surfaces such as by the centrifugal force of the blade  58 . 
         [0055]    The improvements described herein, therefore, are well adapted to carry out the objects and attain the ends and advantages mentioned, as well as others inherent therein. While presently preferred embodiments have been given for purposes of disclosure, numerous changes exist in the details of procedures for accomplishing the desired results. These and other similar modifications will readily suggest themselves to those skilled in the art, and are intended to be encompassed within the spirit of the present disclosure and the scope of the appended claims.