A female cone fishing device

Abstract

The application discloses a female cone fishing device and relates to the technical field of fishing tools for oil and gas drilling and workover, which comprises a shell provided with a mounting hole in the axial direction; a female cone which is axially slidably arranged in the mounting hole, and is provided with a clamping cavity in the female cone; at least one clamping hole is arranged in the radial direction of the female cone, and the clamping hole is located in the range of the clamping cavity; and a clamping piece arranged in the clamping hole is used to move to the inner side of the clamping cavity when moving downward in the process of lifting the fallen object clamped by the female cone, and clamp the fallen object. When the clamping piece arranged in the clamping hole moves to the inner side of the clamping cavity in the process of lifting the fallen object clamped by the female cone, the fallen object clamped by the female cone can be clamped, the device has the characteristics of simple structure, convenient manufacturing and small occupied space, and can solve the problems that the clamping mechanism in the prior art is complex in structure, difficult to manufacture and needs to occupy a larger space.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas drilling and workover fishing tools, in particular to a mother cone fishing device. BACKGROUND

[0002] In the process of oil and gas exploitation, various downhole tools are increasingly widely used, and under the condition of increasingly strengthened drilling parameters, downhole drop accidents occur from time to time in the process of using various downhole tools, which has a great influence on the well construction period of oil and gas wells.

[0003] In order to fish out the downhole drop, the commonly used fishing tools at present are mother cones and the like, and the fishing method is to open the pump to circulate the mud when the mother cone reaches the top end of the downhole drop, to flush out the bottom sand, to guide the top end of the downhole drop into the inside of the mother cone, to apply the drilling pressure and rotate the drill pipe, so that the outside of the downhole drop is formed into a thread under the action of the thread in the inside of the mother cone, and the thread in the inside of the mother cone is engaged together, and then the drilling is started to take out the downhole drop from the wellbore. However, due to the high hardness of the downhole drop, the thread in the inside of the mother cone is often flattened, and in the process of starting the drilling, the vibration caused by various reasons makes the downhole drop fall off from the mother cone, resulting in unsuccessful fishing, further leading to the lengthening of the well construction period and the increase of the cost. In order to solve this phenomenon, the fishing device needs to increase the clamping mechanism, and the existing technology has the problems of complex structure of the clamping mechanism, difficult manufacturing, and the need to occupy a larger space. SUMMARY

[0004] In view of the defects in the prior art, the purpose of the present application is to provide a mother cone fishing device which can solve the problems of complex structure of the clamping mechanism, difficult manufacturing, and the need to occupy a larger space in the prior art.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] The present application provides a mother cone fishing device, which comprises:

[0007] An outer shell provided with a mounting hole in the axial direction;

[0008] A mother cone which is axially slidably arranged in the mounting hole, the mother cone is provided with an engagement cavity, the mother cone is provided with at least one clamping hole in the radial direction, and the clamping hole is located within the range of the engagement cavity;

[0009] A clamping piece arranged in the clamping hole, which is used to move to the inside of the engagement cavity when moving downward during the process of lifting the downhole drop engaged by the mother cone, and clamps the downhole drop.

[0010] On the basis of the above technical scheme,

[0011] In some alternatives, the mounting hole comprises a guiding section, a resisting section and a mounting section connected in sequence, and the outer diameters of the guiding section, the resisting section and the mounting section increase in sequence, the resisting section and the mounting section are connected by a resisting surface, the female cone comprises a small-diameter section and a large-diameter section, the small-diameter section is arranged in the resisting section, the large-diameter section is arranged in the mounting section, and the clamping hole is located at one end of the large-diameter section close to the small-diameter section, when the female cone moves downward in the process of engaging and lifting the fallen object, the resisting surface resists the movement of the clamping piece into the engaging cavity.

[0012] In some alternatives, the clamping piece comprises:

[0013] a pressing block arranged in the clamping hole and close to the engaging cavity, a first inclined surface on the side of the pressing block away from the engaging cavity, and an angle between the first inclined surface and the extension of the resisting section and the center line of the shell being an acute angle;

[0014] a pushing block arranged between the shell and the pressing block and partially overlapping the resisting surface in the axial direction, a length of the pushing block in the axial direction being smaller than a length of the pressing block, and a second inclined surface on the side of the pushing block close to the pressing block being fitted with the first inclined surface.

[0015] In some alternatives, the pushing block is provided with a mounting groove for mounting a lower disc spring arranged in the axial direction.

[0016] In some alternatives, the shell comprises:

[0017] a lower joint for mounting the female cone;

[0018] an upper joint connected with the lower joint and partially extending into the lower joint with a gap for axial movement of the female cone.

[0019] In some alternatives, the female cone is provided with a gap adjustment sleeve on the side close to the upper joint, and a gap between the gap adjustment sleeve and the upper joint for axial movement of the female cone.

[0020] In some alternatives, at least two upper disc springs are arranged between the gap adjustment sleeve and the upper joint, one end of the upper disc spring abutting against the upper joint and the other end abutting against the gap adjustment sleeve.

[0021] In some alternatives, four clamping holes are arranged on the engaging cavity in a circumferential direction.

[0022] In some alternatives, a conical surface is arranged on the side of the pressing block facing the engaging cavity, and a threaded groove or a protrusion is arranged on the conical surface.

[0023] In some alternatives, the female cone outer surface is provided with a spline structure, and the shell inner surface is provided with an outer spline structure matched with the spline structure.

[0024] Compared with the prior art, the application has the advantages of:

[0025] In use of the female cone fishing device, the axial direction of the shell is provided with a mounting hole, the female cone is slidably arranged in the mounting hole, the female cone is provided with a clamping cavity, at least one clamping hole is arranged in the radial direction of the female cone and located in the range of the clamping cavity, and a clamping piece is arranged in the clamping hole and moves to the inner side of the clamping cavity when the female cone is lifted up after clamping the fallen object, so as to clamp the fallen object. The clamping piece arranged in the clamping hole moves to the inner side of the clamping cavity when the female cone is lifted up after clamping the fallen object, so as to clamp the fallen object clamped by the female cone. The structure is simple, the manufacturing is convenient, the occupied space is small, the clamping mechanism in the prior art has the problems of complex structure, difficult manufacturing and large occupied space. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 FIG. 1 is a structural schematic view of an embodiment of the female cone fishing device of the present application;

[0028] Figure 2 FIG. 1 is a structural schematic view of an embodiment of the female cone fishing device of the present application;

[0029] In the figure, 1 is a shell, 12 is a lower joint, 11 is an upper joint, 2 is a female cone, 3 is a pressing block, 4 is a pushing block, 5 is a lower disc spring, 6 is an upper disc spring, 7 is a gap adjusting sleeve, 8 is an abutting surface, and 9 is a counterbore step. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0031] The embodiment of the mother cone fishing device will be further described in detail below with reference to the accompanying drawings.

[0032] As shown in Figure 1 and Figure 2 , the embodiment of the present application provides a mother cone fishing device, comprising:

[0033] a housing 1, which is provided with a mounting hole in the axial direction;

[0034] a mother cone 2, which is axially slidably arranged in the mounting hole, the mother cone 2 is provided with a clamping cavity, and the mother cone 2 is provided with at least one clamping hole in the radial direction, and the clamping hole is located within the range of the clamping cavity;

[0035] a clamping piece arranged in the clamping hole, which is used to move to the inner side of the clamping cavity when moving downward during the process of lifting the fallen object by the mother cone 2 clamping the fallen object.

[0036] In use of the mother cone fishing device, the axial direction of the housing 1 is provided with the mounting hole, the mother cone 2 is axially slidably arranged in the mounting hole, the mother cone 2 is provided with the clamping cavity, the mother cone 2 is provided with at least one clamping hole in the radial direction, and the clamping hole is located within the range of the clamping cavity, and the clamping piece is arranged in the clamping hole, which is used to move to the inner side of the clamping cavity when moving downward during the process of lifting the fallen object by the mother cone 2 clamping the fallen object. By arranging the clamping piece in the clamping hole to move to the inner side of the clamping cavity when moving downward during the process of lifting the fallen object by the mother cone 2 clamping the fallen object, the fallen object clamped by the mother cone 2 can be achieved, which has the characteristics of simple structure, convenient manufacturing and small space occupation, and can solve the problems of complex structure of the clamping mechanism, difficult manufacturing and the need to occupy more space in the prior art.

[0037] As shown in Figure 1 , in some optional embodiments, the mounting hole comprises a guiding section, a bearing section and a mounting section which are sequentially communicated, and the outer diameters of the guiding section, the bearing section and the mounting section sequentially increase, the bearing section and the mounting section are connected through a bearing surface 8, the mother cone 2 comprises a small-diameter section and a large-diameter section, the small-diameter section is arranged in the bearing section, the large-diameter section is arranged in the mounting section, and the clamping hole is located at one end of the large-diameter section close to the small-diameter section, and the bearing surface 8 bears the movement of the clamping piece to the clamping cavity when moving downward during the process of lifting the fallen object by the mother cone 2 clamping the fallen object.

[0038] In the embodiment, the mounting hole comprises three sequentially communicating sections, including a guiding section, a bearing section and a mounting section, and the outer diameters of the guiding section, the bearing section and the mounting section sequentially increase, the bearing section and the mounting section are connected through the bearing surface 8, the female cone 2 comprises a small-diameter section and a large-diameter section, the small-diameter section is arranged in the bearing section when the female cone 2 is arranged in the mounting hole, the large-diameter section is arranged in the mounting section, and the clamping hole is arranged at one end of the large-diameter section close to the small-diameter section. When the female cone 2 moves downward in the process of engaging and lifting the litter, the bearing surface 8 bears the clamping member away from one end of the bearing section, so that the clamping member moves into the engaging cavity, and the structure is simple and the effect is good.

[0039] In the embodiment, the clamping member is a clamping block, and the bearing surface 8 is an inclined surface. When the female cone 2 moves downward in the process of engaging and lifting the litter, one end of the clamping block close to the shell 1 bears on the inclined surface, so that the clamping block moves into the engaging cavity as a whole.

[0040] In the embodiment, the opening of the bearing section is β, and the position of the clamping member is α.

[0041] As shown in Figure 1 and Figure 2 In some optional embodiments, the clamping member comprises:

[0042] The pressing block 3 is arranged in the clamping hole and close to the engaging cavity, one side of the pressing block 3 away from the engaging cavity is a first inclined surface, and the angle between the extension surface of the first inclined surface and the center line of the shell 1 is an acute angle.

[0043] The pushing block 4 is arranged between the shell 1 and the pressing block 3 and partially overlaps the bearing surface 8 in the axial direction, the length of the pushing block 4 in the axial direction is less than the length of the pressing block 3, and one side of the pushing block 4 close to the pressing block 3 is a second inclined surface which is in contact with the first inclined surface.

[0044] In the embodiment, the specific structure of the clamping member is illustrated, the clamping member comprises the pressing block 3 and the pushing block 4, the pressing block 3 is arranged in the clamping hole and close to the engaging cavity, one side of the pressing block 3 away from the engaging cavity is a first inclined surface, and the angle between the extension surface of the first inclined surface and the center line of the shell 1 is an acute angle, the pushing block 4 is arranged between the shell 1 and the pressing block 3 and partially overlaps the bearing surface 8 in the axial direction, the length of the pushing block 4 in the axial direction is less than the length of the pressing block 3, and one side of the pushing block 4 close to the pressing block 3 is a second inclined surface which is in contact with the first inclined surface. When the female cone 2 moves downward in the process of engaging and lifting the litter, the bearing surface 8 bears the pushing block 4, so that the pressing block 3 moves downward with the female cone 2, the pushing block 4 remains stationary, that is, the pushing block 4 moves upward relative to the pressing block 3, the second inclined surface presses the first inclined surface, so that the pressing block 3 moves into the engaging cavity, and the structure is simple and easy to realize.

[0045] In the example, the outer side surface of the push block 4 is a circular arc surface matched with the inner surface of the mounting hole of the shell 1, and the inner surface of the pressing block 3 is a tapered surface or a cylindrical surface consistent with the taper of the female taper 2. The diameter of the outer circle of the lower end of the push block 4 is smaller than the diameter of the abutting section.

[0046] As shown in Figure 1 In some optional embodiments, the push block 4 is provided with a mounting groove for mounting the lower disc spring 5 arranged in the axial direction.

[0047] In the example, the push block 4 is provided with a mounting groove, one end of the lower disc spring 5 abuts in the mounting groove, and the other end abuts on the abutting surface 8. When the push block 4 abuts on the abutting surface 8, the lower disc spring 5 plays a buffering role, preventing the push block 4 from being damaged due to excessive force.

[0048] In the example, a plurality of lower disc springs 5 can be arranged in the mounting groove of the push block 4.

[0049] As shown in Figure 1 In some optional embodiments, the shell 1 includes:

[0050] a lower joint 12 for mounting the female taper 2;

[0051] an upper joint 11 connected with the lower joint 12 and partially extending into the lower joint 12, and leaving a gap for axial movement of the female taper 2.

[0052] In the example, the structure of the shell 1 is specifically described. The shell 1 includes the lower joint 12 for mounting the female taper 2 and the upper joint 11. One end of the upper joint 11 is provided with a male buckle, and one end of the lower joint 12 is provided with a female buckle. The male buckle arranged at one end of the upper joint 11 is connected with the female buckle of the lower joint 12, and a gap is left for axial movement of the female taper 2, so that the female taper 2 can move upward during the process of engaging with the fallen object.

[0053] In the example, the lower joint 12 is provided with a counterbore step 9 for facilitating positioning of the position of the female taper 2.

[0054] As shown in Figure 1 In some optional embodiments, the female taper 2 is provided with a gap adjustment sleeve 7 on the side close to the upper joint 11. A gap is left between the gap adjustment sleeve 7 and the upper joint 11 for axial movement of the female taper 2.

[0055] In the example, the gap adjustment sleeve 7 is arranged on the side of the female taper 2 close to the upper joint 11, and a gap is left between the gap adjustment sleeve 7 and the upper joint 11 for axial movement of the female taper 2. The gap adjustment sleeve 7 can facilitate adjustment of the interval of upward movement of the female taper 2, so that the movement of the female taper 2 is more stable.

[0056] As shown in Figure 1As shown in the optional embodiments, at least two upper disc springs 6 are arranged between the gap adjusting sleeve 7 and the upper joint 11, one end of the upper disc spring 6 abutting against the upper joint 11, and the other end abutting against the gap adjusting sleeve 7.

[0057] In the embodiment, at least two upper disc springs 6 are arranged between the gap adjusting sleeve 7 and the upper joint 11, one end of the upper disc spring 6 abutting against the upper joint 11, and the other end abutting against the gap adjusting sleeve 7, limiting the distance of upward movement of the female cone 2, and providing a certain buffering effect. Through the upper disc spring 6, the downward movement of the female cone 2 can also be faster.

[0058] As shown in the optional embodiments, the upper side of the occlusion cavity is circumferentially spaced apart to be provided with four clamping holes. Figure 1 Figure 2 In the embodiment, the upper side of the occlusion cavity is circumferentially spaced apart to be provided with four clamping holes, and the four clamping holes are cooperatively provided with four clamping members to jointly exert a pressing action, so that the force of the fallen object occluded by the female cone 2 is more reasonable, and the clamping action is better.

[0059] In the embodiment, the side of the pressing block 3 facing the occlusion cavity is provided with a tapered surface, and the tapered surface is provided with a threaded groove or a protrusion.

[0060] In the embodiment, the side of the pressing block 3 facing the occlusion cavity is provided with a tapered surface, and the tapered surface is provided with a threaded groove or a protrusion. The fallen object occluded by the female cone 2 is better clamped, and the secondary falling of the fallen object is prevented.

[0061] As shown in the optional embodiments, the outer surface of the female cone 2 is provided with a spline structure, and the inner surface of the shell 1 is provided with an outer spline structure matched with the spline structure.

[0062] In the embodiment, the outer surface of the female cone 2 is provided with a spline structure, and the inner surface of the shell 1 is provided with an outer spline structure matched with the spline structure, so as to facilitate the installation of the female cone 2 and the movement of the female cone 2 in the axial direction. Figure 2 In the embodiment, the inner side of the shell 1 mounting hole can be provided with a circular arc petal structure, and the outer side of the female cone 2 is provided with an outer petal structure matched with the petal structure.

[0063] The number of petals or splines is four.

[0064] The number of petals or splines is four.

[0065] The number of petals or splines is four.

[0066] ​In summary, in the use of the female cone fishing device, the axial direction of the shell 1 is provided with a mounting hole, the female cone 2 is slidably arranged in the mounting hole, the female cone 2 is provided with a clamping cavity, at least one clamping hole is arranged in the radial direction of the female cone 2, and the clamping hole is located in the range of the clamping cavity. The clamping piece is arranged in the clamping hole, and moves to the inner side of the clamping cavity when the female cone 2 is lifted up after engaging the fallen object, and clamps the fallen object. By arranging the clamping piece in the clamping hole, the clamping piece moves to the inner side of the clamping cavity when the female cone 2 is lifted up after engaging the fallen object, and clamps the fallen object. The structure is simple, convenient to manufacture and small in occupied space, and can solve the problems of complex structure, difficult manufacturing and large space occupation of the clamping mechanism in the prior art.

[0067] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0068] It should be noted that in the present application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the sentence "including a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0069] The foregoing detailed description of the application has been presented for purposes of illustration and description. Various modifications and changes can be made to these embodiments without departing from the spirit and scope of the application. It is intended that the scope of the application should not be limited by the particular representative embodiments described above.

Claims

1. A mother cone salvage device, characterized in that: include: A housing (1) having a mounting hole provided in its axial direction; A female cone (2) is axially slidably arranged in the mounting hole, an engaging cavity is provided in the female cone (2), and at least one clamping hole is provided in the radial direction of the female cone (2), and the clamping hole is located within the range of the engaging cavity; A clamping member is provided in the clamping hole and is used to move toward the inside of the engaging cavity to clamp the fallen object when the female cone (2) engages with the fallen object and moves downward in the process of lifting it up; The mounting hole comprises a guide section, a supporting section and a mounting section which are connected in sequence, and the outer diameters of the guide section, the supporting section and the mounting section increase in sequence, and a supporting surface (8) is provided between the supporting section and the mounting section, and the female cone (2) comprises a small diameter section and a large diameter section, the small diameter section is provided in the supporting section, the large diameter section is provided in the mounting section, and the clamping hole is located at one end of the large diameter section close to the small diameter section, and when the female cone (2) engages with the fallen object and moves downward in the process of lifting it up, the supporting surface (8) supports the clamping member to move into the engaging cavity; The clamping member comprises: A pressure block (3) is arranged in the clamping hole and close to the bite cavity, the side of the pressure block (3) away from the bite cavity is a first inclined surface, and the angle between the extended surface of the first inclined surface to the abutting section and the center line of the shell (1) is an acute angle; A push block (4) is provided between the housing (1) and the pressing block (3), and partially overlaps with the abutting surface (8) in the axial direction. The length of the push block (4) in the axial direction is less than the length of the pressing block (3). A side of the push block (4) close to the pressing block (3) is a second inclined surface that is in contact with the first inclined surface. The housing (1) comprises: A lower joint (12) for mounting the female cone (2); An upper joint (11) is connected to the lower joint (12) and partially extends into the lower joint (12), leaving a gap for axial movement of the female cone (2); A gap adjustment sleeve (7) is provided on a side of the female cone (2) close to the upper joint (11), and a gap is left between the gap adjustment sleeve (7) and the upper joint (11) to allow the female cone (2) to move axially.

2. A female cone salvage device according to claim 1, characterized in that: The push block (4) is provided with a mounting groove, and the mounting groove is used to mount a lower disc spring (5) arranged along the axial direction.

3. The female cone salvage device according to claim 1, characterized in that: At least two upper disc springs (6) are provided between the gap adjustment sleeve (7) and the upper joint (11), one end of the upper disc spring (6) abuts against the upper joint (11), and the other end abuts against the gap adjustment sleeve (7).

4. The female cone salvage device according to claim 1, characterized in that: The engaging cavity is provided with four clamping holes at intervals along the circumferential direction.

5. The female cone salvage device according to claim 1, characterized in that: The side of the pressing block (3) facing the engaging cavity is a conical surface, and a thread groove or a protrusion is provided on the conical surface.

6. The female cone salvage device according to claim 1, characterized in that: The outer surface of the female cone (2) is provided with a spline structure, and the inner surface of the outer shell (1) is provided with an external spline structure that is mounted in cooperation with the spline structure.

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