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CROSS-REFERENCE TO RELATED APPLICATIONS  
       [0001]     This application claims priority to U.S. Ser. No. 60/514,946 filed Oct. 3, 2002, the entire disclosure of which is incorporated herein by reference and U.S. Ser. No. 60/514,883 filed Oct. 27, 2003, the entire contents of which is incorporated herein by reference. 
     
    
     BACKGROUND  
       [0002]     In the hydrocarbon exploration and recovery arts it is often desirable to employ valves in the downhole environment to control the migration of fluids. In some cases these valves include a closure member that is positionable across a flow area of a tubing string to shut in the wellbore below the closure member. Such valves are often called safety valves. Tubing retrievable safety valve(s) (TRSV) are commercially available from Baker Oil Tools, Houston, Tex., under part number H826103110. These valves have been extensively and reliably employed all over the world. Due to harsh conditions downhole however, all downhole components have limited life spans. When a TRSV fails to operate at optimum, cost associated with profitable hydrocarbon recovery can rise. In such cases, it is desirable to lock the original TRSV open and provide for communication with, and thus control over, a wireline run safety valve to be installed to assume the function of the original TRSV. Devices configured to provide such communication are known to the art but each has drawbacks. Advancements in the art are always beneficial and well received.  
       SUMMARY  
       [0003]     Disclosed herein is a communication and lock open device. The device includes a lock open portion including a latch configured to engage a shifting profile on a closure member of a safety valve. The device further includes a communication portion configured to rotationally align a cutter with a non-annular hydraulic bore in the safety valve and axially cut into the hydraulic bore with the cutter.  
         [0004]     Further disclosed herein is a selective collet which includes a sleeve having one or more fingers, at least one of the fingers having an attachment feature and an upset extending radially outwardly of the sleeve. The sleeve further includes a latch hold down engageable with a latch to prevent engagement thereof with another structure.  
         [0005]     Also disclosed herein is a tubing retrievable safety valve that includes a housing, a flow tube mounted at the housing, a closure member mounted at the housing by a selectively shearable thread, the closure member operable responsive to the flow tube, a biasing member in operable communication with the flow tube, and a hydraulic control fluid in pressurizable communication with the flow tube.  
         [0006]     Also disclosed herein is a method for replacing the function of a tubing retrievable safety valve while employing an original control line including running a communication and lock open tool in a wellbore, locating the tool in a tubing retrievable safety valve and shearing a thread in the tubing retrievable safety valve to render longitudinally moveable a closure member of the tubing retrievable safety valve. The method further includes shifting the closure member to lock the member in an open position, orienting a cutter and longitudinally establishing fluid communication with a piston bore of the tubing retrievable safety valve. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0007]     Referring now to the drawings wherein like elements are numbered alike in the several Figures:  
         [0008]     FIGS.  1 A-C are a cross-sectional view of a TRSV modified slightly from the commercial embodiment identified in the background section of this application;  
         [0009]     FIGS.  2 A-G,  3 A-G,  4 A-G,  5 A-G,  6 A-G,  7 A-G,  8 A-G,  9 A-G,  10 A-G and  11 A-G, are all extended view of one embodiment of the communication and lockout device in progressive actuation positions;  
         [0010]      FIG. 12  is an enlarged view of tab  110  to illustrate the chisel edge; and  
         [0011]      FIGS. 13-16  illustrate alternate components for certain components illustrated in FIGS.  2 A-G to FIGS.  11 A-G. 
     
    
     DETAILED DESCRIPTION  
       [0012]     Referring to FIGS.  1 A-C, one of skill in the art should recognize most of the components of the TRSV  10  illustrated. These are not discussed specifically herein other than incidentally to the discussion of the communication and lock open tool and with respect to features of the TRSV that are themselves new. Components of the illustrated TRSV that are distinct from the commercially available TRSV and do represent a portion of the invention includes a thread  12  and a profile  14 . Thread  12  is not visibly changed from the prior art TRSV but is indeed modified. Thread  12  is in one embodiment, constructed as a narrow cross-section thread (about ½ thickness of standard square thread profile for example). The thread may be made from an alloy such as nickel alloy and may be annealed to a specified yield strength (lower than mating parts). Further, in some applications, sections of the thread are removed (milled from substantially to completely through from inside dimension to outside dimension) to achieve the desired shear value. Any shear valve can be obtained. This also accommodates the disassembly of the tool to allow removal of the sheared part. Upon shearing, the flapper (closure member)  16  is longitudinally moveable relative to the TRSV housing  11 . By shifting (moving) the flapper relative to housing  11 , to a location where part of the flapper is behind a lock tab  18  in the TRSV  10 . The flapper  16  is no longer closeable and is thus locked open. It is noted that the shear strength of the thread  12  is selected to be equivalent in strength to any and all of the other commercial components of the flapper assembly. This prevents unintended shearing and related problems.  
         [0013]     As noted above, another new addition to the commercial TRSV is profile  14 . The profile itself is relevant to the function described herein and not what supports that profile. In the illustrated embodiment, profile  14  is occasioned by a sleeve  104 , but it could easily be an integral portion of housing  11  of TRSV  10 , if desired. The purpose of profile  14  is to orient an alignment device such as an alignment collet, which orients a cutter, which is part of the communication and lock open tool discussed further hereunder. Profile  14  ensures that the cutter will create communication by cutting into a non-annular hydraulic chamber comprising a piston bore  20  (hydraulic chamber) of the original TRSV  10 . It will be appreciated by one of ordinary skill in the art that original piston bore  20  is fluidly connected to a control line  22 , commonly hydraulic, that is in operable communication with a control location, which may be remote, and may be a surface location. By cutting into piston bore  20 , the communication medium employed by piston bore  20  (e.g., hydraulic fluid) is available at an inside dimension of the TRSV  10  and therefore available to communicate with an after-installed replacement valve such as a wireline retrievable safety valve (WRSV). Such communication with the after-installed valve means that the after-installed valve is controllable from the original remote or surface location using the original control line  22 .  
         [0014]     Referring to FIGS.  2 A-G, the communication and lock open device  30  described herein is illustrated disposed at an inside dimension of the TRSV  10  in a non-actuated condition, having been run there on a suitable string (not shown) due to a desire to replace the function of TRSV  10 . Device  30  comprises many components that cooperate with one another and move relative to one another in a predetermined sequence wherein components, for example, at an uphole end of device  30  and a more downhole portion of device  30  may actuate simultaneously or in sequence. For clarity, the interconnection of the various components is described first, with operation of those components only alluded to where such allusion provides for better understanding. A detailed description of the operation of device  30  follows this initial component description. In connection with the component description, reference, to FIGS.  2 A-G is largely sufficient without reference to other figures. It is pointed out however that due to movement of the tool, some figures may make viewing some components easier. Components are numbered in each of the drawings to avoid any ambiguity. Reference to other of the drawings may be helpful.  
         [0015]     Beginning at the uphole end of the device  30  (at the left of the drawings) a fishing neck  32  is in communication with an upper shaft sleeve  34 . Fishing neck  32  also includes at a downhole end thereof a spring washer  36  for decreasing impact force when the tool is fully stroked. Fishing neck  32  is threadedly connected to upper shaft  38  at thread  40 . Upper shaft  38 , at a downhole end thereof is threadedly connected to shaft  42  at thread  44 . In order to prevent the unintentional unmating of thread  44 , one or more set screw(s)  46  are employed in one embodiment. On an outside dimension of upper shaft  38 , near thread  44  (which is on an inside dimension of the upper shaft), is dog recess  48  having beveled edges  50 . Edges  50  communicate with beveled edges  52  on dogs  54 . Dogs  54  communicate with upper latch mandrel  56 . Upper latch mandrel  56  further includes an upper C-ring  58  and extends in a downhole direction to one or more shear screw(s)  60 . Shear screw(s)  60 , releasably affix upper latch mandrel  56  to upper latch collet  62  which is threadedly connected to upper latch extension  64  through thread  66  and set screws  68 . Upper latch extension  64  includes on its inside dimension, a recess (or plurality of recesses)  70  to receive a portion of dogs  54  during actuation of the device  30 .  
         [0016]     Upper latch collet  62  extends in a downhole direction to culminate at collet profile  72 , which is configured to engage a lock profile  74  in the TRSV  10 . It will be appreciated that lock profile  74  includes a shoulder  76  that provides a no-go when combined with shoulder  78  on collet profile  72 . In one embodiment, the shoulders are reverse cut to hold without support for a position of the operation. Collet profile  72  is supported in engaged condition with lock profile  74  by latch support  80  when the device  30  is actuated. Support is provided by surface  82  of latch support  80 . It will be appreciated that approach ramp  84  assists in allowing movement of latch support  80  to the support position under collet profile  72 .  
         [0017]     Device  30  may be run selectively or non-selectively with respect to the action of upper latch collet  62 . This is occasioned by selective collet  81  having an upset  83 , a collet attachment  85  and latch collet hold down  87 . Attachment  85  communicates with recess  91  in latch mandrel  56  in one of two ways. One way is that attachment  85  is engaged with recess  91  ab initio and the tool is not in selective engagement mode. The second is that attachment  85  is not engaged with recess  91 . In this configuration, latch collet hold down  87  is in communication with the upper latch collet  62  urging collet profile  72  inwardly, which prevents engagement thereof with TRSV profile  74 . This configuration would be employed when several TRSVs are in the well, and one deeper than the first is targeted. In the selective mode, the upset  83  is employed to release the collet  62  at the appropriate depth. Since the seal bore in the TRSV is the smallest internal dimension, the upset will catch on it. If it catches on it in an upward movement, the selective collet  81  is moved out of communication with profile  72  and will allow profile  72  to engage the TRSV profile  74 . Thus, in use, the device  30  is run to a location just downhole of the target TRSV and then pulled back to selectively engage with that TRSV. Upon actuation of the selective collet  81 , the attachment  85  engages recess  91  to prevent later interference of selective collet  81  with the operation of latch collet  56 .  
         [0018]     Latch support  80  is driven, through shear screw(s)  86 , by upper latch mandrel  56 . Once latch support  80  is in the desired location, angle surface  88  will shoulder on bevel  90 . Subsequent downhole force on upper latch mandrel  56  will shear screw(s)  86 .  
         [0019]     A downhole end  92  of upper latch mandrel  56  is inter-engaged with guide  94  (numbered in two places to make extent of component clear). Guide  94  provides support and articulation to cutter retainer  96  and cutter dog  98 . Cutter dog  98  includes a bumper  99  to limit radial movement in the illustrated embodiment. Cutter dog  98  is configured to rotate to an aligned position with the non-annular hydraulic piston bore  20 , up to about 180° (in one embodiment) while extending cutter blade  100  to a position commensurate with a larger diametral dimension than an outer dimension of device  30  and having a position aligned with and uphole of piston bore  20  in TRSV  10 . Cutter dog  98  is configured to cut into piston bore  20  with axial only (as illustrated) or axial and radial movement together (with manipulation of the timing of interaction of the relevant components) coincident axially downward movement of components of device  30  including upper latch mandrel  56  and associated components moveable therewith as discussed hereinabove and detailed hereinbelow.  
         [0020]     The movement of cutter dog  98  is caused by profile  102  in a sleeve  104  disposed at an inside dimension of TRSV  10  through alignment collet  108  which includes alignment tab  110 . Alignment collet  108  is urged outwardly to follow profile  102  by mandrel  112 , which includes frustoconical sections  114  and  116 . The two angled frustocones are provided to urge the cutter dog into the cutting position. Two angles are provided as opposed to one for clearance between guide  94  and mandrel  112  to increase initial radial cutter movement, and to ensure radial movement is complete prior to cutting into the bore  20 . Mandrel  112  is maintained in position while alignment collet  108  is urged downhole to effect the wedging outward of alignment collet  108 . Maintenance of mandrel  112  in place is effected by an uphole end thereof where mandrel  112  is threadably engaged with latch support  80  at thread  118 , and set screw(s)  120 . Thus mandrel  112  is hung from latch support  80 . It is noted that sleeve  104  further includes a slot  106  to positively locate alignment tab  110 .  
         [0021]     Movement of alignment collet  108  causes movement of guide  94  through alignment collet slides  122  in grooves  124  of guide  94 .  
         [0022]     A downhole end of guide  94  is axially slidably mounted at cap screw(s)  126  through a downhole end of alignment collet  108  to a collar  128 , which slides on mandrel  112  and functions to centralize the collet  108  and guide  94 . Guide  94  further includes slot(s)  127  to cooperate with cap screw(s)  126 .  
         [0023]     Mandrel  112  extends downhole for a distance in one embodiment of about  27  inches to accommodate the length of the flow tube and power spring in the TRSV. A downhole end of mandrel  112  is threadedly connected to inner sleeve  134  through thread  130  and set screw(s)  132 . Inner sleeve  134  attaches at a downhole end thereof via shear screw(s)  146  to outer sleeve  148 . Outer sleeve  148  is attached at a downhole end thereof to lower latch mandrel  150  through thread  152  and set screw(s)  154 . Within mandrel  112 , shaft  42  extends downhole beyond the downhole end of mandrel  112  to terminate by threaded connection  136  and set screw(s)  138  to slide  140 . Slide  140  is slidingly received in inner sleeve  134 . Mounted within inner sleeve  134  is spring pin  142  and downhole end  144  of slide  140 . At an inner dimension of slide  140  is lower shaft  156 , which is shear screwed  158  to slide  140  at  144 . Spring pin  142  slides with slide  140  at recesses  145 . Lower shaft  156  continues downhole through lower latch mandrel  150  to a dimensionally enlarged downhole terminus having angled surfaces  160 , and  164  which function to urge lower latch collet  162  outwardly at an appropriate time in the actuation sequence described hereunder to engage surface  163  with TRSV shifting profile  165 . Surfaces  160  and  164  define a single angled surface interrupted by a machining groove utilized in manufacture of the devices to simplify the same with respect to room for machining.  
         [0024]     Threadedly connected to lower shaft  156  via thread  166  and set screw(s)  168  is lower shaft extension  170 . Lower shaft extension  170  is disposed within mandrel extension  172  which itself is connected via cap screw(s)  174  to lower latch mandrel  150 . Outwardly disposed at the mandrel extension  172  is dog support  174 . Dog support  174  includes a profiled uphole section  176  having uphole and downhole facing angled surfaces  178 ,  180 . Surfaces  178 ,  180  function to actuate locating dogs  182 . Actuation of dogs  182  occurs when profile  176  is moved uphole or downhole of dog pivot point(s)  184 . Dogs  182  themselves include an uphole actuation surface  186  and a downhole retraction surface  188  whose interaction with profile  176  services to actuate the dogs and retract the dogs, respectively. A C-ring  190  is disposed around dog support  174 . The C-ring interacts with grooves  192  and  194  to maintain actuation and retraction positions of dog support  174  subsequent to sufficient actuation force to move the support to the desired position by collapsing the C-ring over rib  196 . A snap ring  195  is also set around mandrel extension  172  to move dog support  174  upon downward movement of other components, whose movement will be clear from the operation discussion hereunder. Grooves  192  and  194  are provided in a dog housing  197 . Dog housing  197  is connected to cap  198  by thread  200 . Cap  198  is further connected by thread  202  and set screw(s)  204  to lower shaft extension  170 . Further, cap  198  includes an o-ring  206 .  
         [0000]     Operation  
         [0025]     The communication and lock open tool has been described from an uphole end to a downhole end and with light reference to the interplay of components. In this section applicant will describe the complete operation of the device with reference to all of the figures of the application. It will be appreciated that this device is to be run in the hole to a TRSV  10  having the features described herein as unique over prior art TRSVs. Referring to FIGS.  2 A-G, the tool is in a run-in position, no actuation having been started. Referring to FIGS.  3 A-G actuation has begun in that the collet profile  72  has naturally snapped outwardly into lock profile  74  with a TRSV  10 . In the illustrated embodiment the selective collet  81  has not been employed and is thus shown as of run-in engaged at attachment  85  with recess  91 . It is noted that due to the reverse cut of shoulder  78  on the collet profile  72  and shoulder  76  of the lock profile  74  of TRSV  10  the tool in this position can and does hold some weight. The weight that is held by the reverse cut is sufficient to allow angle  50  of upper shaft  38  to bear against dogs  54  causing the dogs  54  and the upper latch mandrel  56  to move downhole. Such movement of course will cause shear screw(s)  60  to shear under that load. The load provided to shear shear screw(s)  60  is only present until dogs  54  move radially outwardly into recess  70  of upper latch extension  64 . Upon dogs  54  moving into recess  70 , angle  50  no longer bears upon dogs  54  and therefore the load is removed. At this point, the dogs  54  and upper latch mandrel  56  simply sit in the position illustrated in  FIG. 3D  until further actuated as described hereunder. Upper shaft  38  and components thereabove, and indeed components therebelow, which are discussed hereunder, continue to move downhole. It will be noted that latch support  80  will move under collet profile  72  at the same time that dogs  54  snap into recess  70 . Once the latch support  80  is properly positioned under collet profile  72  the communication and lockout device is indeed locked into the TRSV  10  and will not move from that position until collet profile  72  is unsupported by latch support  80 .  
         [0026]     Simultaneously, with the support of collet profile  72 , shaft  42  continues to move downhole causing slide  140  to move downhole with spring pin  142 , lower shaft  156 , lower shaft extension  170 , cap  198 , dog housing  197  and dogs  182 . It will be noted that mandrel extension  172  does not move downhole and that because of snap ring  125  at a downhole end of mandrel extension  172 , dog support  174  cannot move downhole with dog housing  197 . Because dog support  174  cannot move downhole, the profiled uphole section  176  of dog support  174  is urged into contact with actuation surface  186  of dogs  182  uphole of pivot  184  causing the dogs to move outwardly. The outward movement of the dogs has two functions, firstly to open flapper  16  fully so that it may move behind tab  18  in TRSV  10  when thread  12  is sheared and secondly to locate and hold weight on shoulder  185  of dogs  182  in communication with shoulder  183  of TRSV  10 . Helping to maintain the dogs in the desired position is C-ring  190 , which moves over rib  196  into recess  194  from its original retraction position of recess  192 .  
         [0027]     With the locating dogs  182  in the located position, components  156 ,  170 ,  198 ,  197  and  182  can no longer move downhole. Thus, further movement of slide  140  in a downhole direction causes shearing of shear screw(s)  158  that previously connected slide  140  to lower shaft  156  and allowing slide areas  145  to slide past spring pin  142  until downhole end  144  of slide  140  contacts lower latch mandrel  150 . Downward movement of lower latch mandrel  150  causes lower latch collet  162  to move outwardly on surfaces  160  and  164  thereby increasing its diametral dimension until surface  163  engages shifting profile  165  within TRSV  10 . Simultaneously, lower latch mandrel  150  through cap screws  174  causes mandrel extension  172  as well as lower latch collet  162  to move further downhole. Upon this movement and referring to  FIGS. 3F and 4F  directly, the thread  12  is sheared causing flapper  16  to move behind tab  18  to lock open the flapper  16 . As noted above, mandrel extension  172  is also moving downhole simultaneously. That downhole movement without other effect is limited by shoulder  173  which will contact shoulder  175  of dog support  174 . Upon contact between shoulders  173  and  175 , C-ring  190  is moved from recess  194  back into recess  192  causing profiled uphole section  176  of dog support  174  to interact with the retraction surface  188  of dogs  182  thereby causing dogs  182  to disengage from TRSV shoulder  183  and retract to their pre-actuation position. At the same time that dogs  182  retract, the lower latch collet  162  reaches a downhole facing surface  167  of lower shaft  156  which allows lower latch collet  162  to snap back into its pre-actuation dimension but in a different position downhole of surface  167 . This movement disengages the lower end of the tool from the TRSV and concludes the lock open operation. The fact that the lock open operation has been concluded is signaled to an operator by a drop of the tool approximately eight inches once dogs  182  and collet  162  are disengaged from TRSV  10 . The positions of the components of the tool following the approximately eight-inch drop are illustrated in  FIGS. 4A-4G .  
         [0028]     With the lock out operation concluded, it is time to create communication with the old piston bore  20  such that a new wireline retrievable safety valve can be installed and operated from the original control line  22 . With the tool in the position indicated in  FIGS. 4A and 4B , one will note that upper shaft sleeve  34  has come into contact with dogs  54  thereby reloading those dogs which were unloaded at the beginning of the lock open operation by moving into recess  70 . Referring to  FIG. 6 , with the further downhole movement of uphole components  32 ,  36 ,  34 ,  38 , one will appreciate that dogs  54  have been urged downhole thereby urging upper latch mandrel  56  downhole as well. This movement loads shear screw(s)  86  and shears them at a selected load causing guide  94  to begin moving downhole, which itself urges alignment collet  108  downhole. It should be noted at this point that the urging of alignment collet  108  downhole does not occur from the uphole edge of alignment collet  108  at alignment tab  110  but rather occurs at short collet ends  109  which are visible in broken lines to show location in each of the drawings but are also shown deflected in broken lines in  FIGS. 8D, 9D  and  10 D to illustrate how they function relative to mandrel  112 . It is apparent herefrom that the short collet fingers are urged inwardly through the combined action of angle  95  and mandrel neck down  113 .  
         [0029]     As the alignment collet  108  moves downhole it will move outwardly in a recess area  111  of the original TRSV  10  such that alignment tab  110  will land on alignment profile  14 . In order to make the drawings most clearly illustrate the movement of the device, the alignment tab has been originally illustrated in a position  180  degrees off from its final desired aligned position. It will be understood that the alignment profile  14  occurs around the perimeter of the TRSV, such as a mule shoe, so that regardless of the orientation of the communication and lock open device upon initial run-in the alignment tab  110  will be picked up by some portion of the alignment profile  14  and will thereby be rotated into alignment to allow for the cutting device to create the communication desired. Also noted is that normally device  30  is not used until a sufficient time has passed from original well completion that it is likely scale has built up on surfaces downhole. Because of this likely condition, it is desirable to provide a chisel-like cutting edge on tool tab  110  to cut through the scale allowing the tab to follow profile  14  as intended. A schematic view of the chisel-like cutting feature is illustrated as numeral  208  in  FIG. 12 .  
         [0030]     Referring to  FIGS. 7C and 7D  the device has now rotated the alignment collet  108  and thereby the guide  94  into the appropriate position. In the appropriate aligned position, cutter dog  98  and cutter  100  are positioned longitudinally uphole of the piston bore  20  of original TRSV  10 . Further downhole movement of upper shaft  38  and related components causes the upper latch mandrel  56 , the guide  94  and cutter dog  98  with cutter  100  to continue to move downhole into contact with mandrel  112  frustoconical sections  114  and  116  to position the cutter to open a communication channel with the piston bore  20 . Once the cutter is positioned correctly the purpose of slot  127  becomes apparent. At this point in the procedure the alignment collet  108  has been rotated and dropped into its retaining slot in the TRSV  10  and can no longer move downhole, yet the cutter  100  is still uphole of the piston bore  20 . Further downhole movement of upper latch mandrel  56  and related components as set forth hereinabove cause the cutter  100  to move longitudinally downhole onto frustocones  114  and  116  and into piston bore  20  of TRSV  10 , cutting a path into piston bore  20  and thereby opening communication to the inside dimension of TRSV  10  from the original control line surface or other remote location. In order for the movement of guide  94  downhole to allow the cutter to enter piston bore  20  guide  94  must be able to move relative to alignment collet  108 . Slots  127  allow for such movement.  FIG. 8D  illustrates the cutter inside the space of piston bore  20 . At this point and referring to  FIG. 9  the tool is to be withdrawn from the downhole environment thus making way for a later run WRSV or other replacement valve or tool. Upon the beginning of the uphole pull on fishing neck  32 , upper shaft  38  moves upwardly within upper latch mandrel  56  until a bottom end angle  48  of upper shaft  38  picks up on ring  58  such that the upper shaft  38  can pull upper latch mandrel  70  uphole. Further, the cutter dog is unsupported from the frustocones  114 ,  116  and brought back into its original unactuated position by cutter retainer  96 . This is illustrated in  FIGS. 9, 10  and  11 . As the fishing neck reaches full extension, the upper latch mandrel  56  moves back to its original position where its shoulder on upper latch extension  64  and guide  94  comes back into contact with latch support  80 . Further pulling uphole unsupports collet profile  72  so that it is collapsible and therefore disengagable from TRSV  10  and the tool is withdrawn from the hole.  
         [0031]     Further to the foregoing discussion of a first embodiment of the control system communication and lock open tool there are several components that can be replaced with alternatives. The alternative components may be individually substituted for those described above, may be substituted in groups or may all collectively be substituted for like components as described above.  
         [0032]     In one alternate component the cutter dog  98  represented in  FIG. 2C  is modified to slide upon the outside dimension of the mandrel  112 . Cutter dog  98   a  (see  FIG. 13 ) is formed to include slide area  400 , which has an angle calculated to match an outside dimension of the mandrel  112  relative to the angle of the cutter. This area  400  slides upon the outside dimension of mandrel  112  during use. The arrangement provides for greater stability of the cutter dog  98   a,  as a greater percentage of the surface area of the dog remains supported throughout its motion. This may be beneficial in some applications. In other respects the tool operates as above described.  
         [0033]     In another alternate component, the lower shaft  156  introduced in  FIG. 2E  is modified and illustrated in  FIG. 14  as lower shaft  156   a.  A set of segments  404  are located such that they engage a recess  402  while remaining in contact with slide  140  at interface  406 . Segments  404  are maintained in the engaged position by the inside dimension of inner sleeve  134 . A relief  407  is provided in the inside dimension of inner sleeve  134   a  to allow the segments  404  to move outwardly and disengage recess  402  in lower shaft  156   a.  Once disengaged, the operation of the device is as disclosed hereinabove.  
         [0000]     This alternate construction allows the tool to sustain an impact load on the lower shaft while the tool is being run downhole without premature shearing of the shear screws  158 .  
         [0034]     Yet another component, referring to  FIG. 15 , modifies lower shaft  156  and lower shaft extension  170  as those components are illustrated in  FIG. 2F . As above described, and illustrated in  FIG. 2F , lower shaft  156  is threadedly attached to lower shaft extension  170 . Set screws  168  are also employed to prevent relative rotation of the two parts. Illustrated in  FIG. 15 , the lower shaft and lower shaft extension are replaced by an extended lower shaft  408 . Shaft  408  includes a collet support  410 , which is attached to shaft  408  by shear members  412 . Collet support  410  provides the angle that was previously provided by surfaces  160  and  164  in  FIG. 2F . Therefore it will be appreciated that the purpose of collet support  410  is too urge lower latch collet  162  outwardly at an appropriate time in the operation of the device. As noted above, collet support  410  is attached to shaft  408  by shear members  412  such as shear screws and therefore can be detached from shaft  408  if desired by placing a load of sufficient predetermined magnitude on the shear screws to shear them. This is of importance when and if the tool encounters an impediment to the proper expansion of the latch into its intended groove. Such may occur due to, inter alia, debris or mislocation problems. In such situation it is possible for the tool as described in  FIG. 2F  to become stuck. The modification detailed in  FIG. 15  resolves that potential by allowing the device to continue to function by shearing the screws  412 , allowing the extended lower shaft  408  to move relative to the collet support  410 .  
         [0035]     In a final alternate component of that hereinbefore described, and referring to  FIG. 16 , the cap  198  of  FIG. 2G  is modified to exist in two parts: a cap mount  414  and a cap head  416 . Cap mount  414  is mounted to lower shaft extension  170  or extended lower shaft  408  depending upon which embodiment is utilized. For purposes of discussing the  FIG. 16  view, shaft  408  is illustrated with the understanding that either shaft could be used. The mounting is at thread  418  and setscrews  420  ensure prevention of relative motion between these parts. Cap mount  414  retains thread  200  from the previously described embodiment, illustrated in  FIG. 3G . The cap mount  414  is attached cap head  416 . As illustrated cap head  416  is fastened utilizing thread  422 . Cap head  416  includes fluid bypass openings  424  to reduce fluid resistance while running the tool. Also noted is that the cap head may be constructed of brass or other softer material to alleviate seal bore damage as the tool is run in the hole.  
         [0036]     It is to be understood that any one component, any group of components or all of these alternate components may be employed with the tool as described earlier in this application.  
         [0037]     While preferred embodiments have been shown and described, various modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. Accordingly, it is to be understood that the present invention has been described by way of illustration and not limitation.

Summary:
Disclosed herein is a communication and lock open device which includes a lock open portion including a latch configured to engage a shifting profile on a closure member of a safety valve. Further included is a communication portion configured to rotationally align a cutter with a non-annular hydraulic bore in the safety valve and axially cut into the hydraulic bore with the cutter. Also disclosed is a method for replacing the function of a safety valve while employing an original control line including running a communication and lock open tool in a wellbore, locating the tool in a tubing retrievable safety valve and shearing a thread in the valve to render moveable a closure member of the tubing retrievable safety valve. The method includes shifting the closure member to lock the member in an open position, orienting a cutter and establishing fluid communication with a bore of the valve.