阅读说明：本技术 打捞矛及打捞装置 (Fishing spear and fishing device ) 是由 顾海瑞 孔洋 范潇 尹玉超 张玉涛 武洪鑫 于 2019-11-12 设计创作，主要内容包括：本发明提供了一种打捞矛及打捞装置,涉及油井打捞技术领域,打捞矛包括矛体和滑动套设在矛体外的矛爪；矛体外壁一端设置有第一限位件,矛体外壁另一端设有用于撑开矛爪的支撑部,矛爪位于第一限位件与支撑部之间,在下压矛体时第一限位件能够与矛爪抵接,在上提矛体时支撑部能够与矛爪内壁抵接；矛体上开设有通孔,通孔内安装第二限位件,矛体内套设有能够使第二限位件凸出矛体外壁的触发件,矛爪远离支撑部的一端设置有能够与第二限位件抵接的限位部,在第二限位件与限位部抵接时,支撑部与矛爪无接触。打捞装置包括打捞矛。达到了方便退出的技术效果。(The invention provides a fishing spear and a fishing device, and relates to the technical field of oil well fishing, wherein the fishing spear comprises a spear body and a spear claw which is sleeved outside the spear body in a sliding manner; one end of the outer wall of the spear body is provided with a first limiting piece, the other end of the outer wall of the spear body is provided with a supporting part for expanding a spear claw, the spear claw is positioned between the first limiting piece and the supporting part, the first limiting piece can be abutted against the spear claw when the spear body is pressed downwards, and the supporting part can be abutted against the inner wall of the spear claw when the spear body is lifted upwards; the spear body is provided with a through hole, the through hole is internally provided with a second limiting part, the spear body is internally sleeved with a trigger which can enable the second limiting part to protrude out of the outer wall of the spear body, one end, far away from the supporting part, of the spear claw is provided with a limiting part which can be abutted against the second limiting part, and when the second limiting part is abutted against the limiting part, the supporting part is not in contact with the spear claw. The fishing device comprises a fishing spear. The technical effect of convenient withdrawal is achieved.)

1. A fishing spear, comprising: a lance body (100) and a lance claw (200) which is sleeved outside the lance body (100) in a sliding way;

the outer wall of the lance body (100) is provided with a first limiting part (101), the outer wall of the lance body (100) is further provided with a supporting part (102) for expanding the lance claw (200), the lance claw (200) is positioned between the first limiting part (101) and the supporting part (102), the first limiting part (101) can be abutted against the lance claw (200) when the lance body (100) is pressed downwards, and the supporting part (102) can be abutted against the lance claw (200) when the lance body (100) is lifted upwards;

the spear body (100) is provided with a through hole (103), the through hole (103) is located between the first limiting part (101) and the supporting part (102), a second limiting part (110) is installed at the through hole (103), a trigger (300) capable of enabling the second limiting part (110) to protrude out of the spear body (100) is sleeved in the spear body (100), one end, far away from the supporting part (102), of the spear claw (200) is provided with a limiting part (210) capable of abutting against the second limiting part (110), and when the second limiting part (110) abuts against the limiting part (210), the supporting part (102) is not in contact with the spear claw (200).

2. The fishing spear of claim 1 wherein the trigger (300) comprises a ball seat (310) and a ball (320), the ball (320) being for sealing the ball seat (310);

the ball seat (310) is provided with a pushing part (313) for pushing the second limiting part (110);

the ball seat (310) is connected with the spear body (100) through a connecting piece (314), and the ball seat (310) can slide along the axis of the spear body (100) when the connecting piece (314) is sheared off; when the ball seat (310) slides away from the first stopper (101), the pushing part (313) can push the second stopper (110) to protrude out of the outer wall of the lance body (100).

3. The fishing spear of claim 2 wherein the ball seat (310) comprises a major diameter section (311) and a minor diameter section (312);

the large-diameter section (311) is connected with the spear body (100) through the connecting piece (314), and the outer wall of the small-diameter section (312) is abutted against the second limiting piece (110);

the transition between the large diameter section (311) and the small diameter section (312) forms the push portion (313).

4. The fishing spear of claim 1, wherein a third retaining member (120) is detachably arranged on the spear body (100) at the through hole (103), and a reset member (130) is arranged between the second retaining member (110) and the third retaining member (120);

under the action of the resetting piece (130), the second limiting piece (110) always has the tendency of being far away from the third limiting piece (120).

5. The fishing spear of claim 4, characterized in that the second retaining member (110) is U-shaped, the third retaining member (120) is straight, the third retaining member (120) is located at the opening of the second retaining member (110), one end of the reset member (130) abuts against the second retaining member (110), and the other end abuts against the third retaining member (120).

6. The fishing spear of claim 4, wherein the spear body (100) is provided with a groove (104) for mounting the third stopper (120), and the third stopper (120) does not protrude from the spear body (100).

7. A fishing spear according to any of claims 1-6 characterized in that the outer wall of the spear (200) is provided with a locating member (220) connected to the inner wall of the object to be fished.

8. A fishing spear according to any of claims 1-6 characterized in that the spear body (100) comprises a connecting section (140), a necking section (150) and a frustum section (160) arranged in sequence;

the through hole (103) is arranged on the connecting section (140), and the supporting part (102) is arranged on the frustum section (160);

the diameter of the connecting section (140) is larger than that of the neck section (150), and the diameter of the frustum section (160) is not smaller than that of the neck section (150).

9. The fishing spear of claim 8, wherein the connecting section (140) is provided with a fourth stop member (141) capable of abutting against the stop portion (210), and the second stop member (110) is located between the first stop member (101) and the fourth stop member (141).

10. A fishing device comprising a fishing spear as claimed in any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of oil well fishing, in particular to a fishing spear and a fishing device.

Background

The working principle of the fishing spear for fishing the oil-water well is as follows: when the fishing spear reaches the top of the fish and is pressurized, the spear is retracted into the top of the fish, the fishing spear is lifted up, the spear body goes upwards, when the spear body supporting part acts on the spear, the spear can catch the top of the fish, the well tool is fished out, and if the fishing spear cannot be fished out after a certain load is exceeded, the fishing spear needs to be withdrawn.

However, the returnable fishing spear in the prior art often fails when quitting work, and quitting is very inconvenient.

Therefore, providing a fishing spear with convenient exit becomes an important technical problem to be solved by the technical personnel in the field.

Disclosure of Invention

The invention aims to provide a fishing spear and a fishing device so as to relieve the technical problem of inconvenient withdrawal in the prior art.

In a first aspect, an embodiment of the invention provides a fishing spear, which comprises a spear body and a spear claw slidably sleeved outside the spear body;

the outer wall of the lance body is provided with a first limiting part, the outer wall of the lance body is further provided with a supporting part for expanding the lance claw, the lance claw is positioned between the first limiting part and the supporting part, the first limiting part can be abutted against the lance claw when the lance body is pressed downwards, and the supporting part can be abutted against the lance claw when the lance body is lifted upwards;

the spear is provided with a through hole, the through hole is located between the first limiting part and the supporting part, a second limiting part is installed at the through hole, the spear is internally sleeved with a trigger capable of enabling the second limiting part to protrude out of the spear, one end, away from the supporting part, of the spear is provided with a limiting part capable of being abutted against the second limiting part, and the supporting part is not in contact with the spear when the second limiting part is abutted against the limiting part.

In combination with the first aspect, embodiments of the present invention provide a possible implementation manner of the first aspect, wherein the trigger includes a ball seat and a ball, and the ball is used for sealing the ball seat;

the ball seat is provided with a pushing part for pushing the second limiting part;

the ball seat is connected with the spear body through a connecting piece, and can slide along the axis of the spear body when the connecting piece is sheared off; when the ball seat slides away from the first limiting piece, the pushing portion can push the second limiting piece to protrude out of the lance body outer wall.

In combination with the first aspect, embodiments of the present invention provide a possible implementation manner of the first aspect, wherein the ball seat includes a large diameter section and a small diameter section;

the large-diameter section is connected with the spear body through the connecting piece, and the outer wall of the small-diameter section is abutted to the second limiting piece;

the transition between the large diameter section and the small diameter section forms the pushing portion.

With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein a third limiting member is detachably disposed at the through hole of the lance body, and a reset member is disposed between the second limiting member and the third limiting member;

under the effect of piece that resets, the second locating part has the trend of keeping away from the third locating part all the time.

With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein the second limiting member is U-shaped, the third limiting member is in a straight shape, the third limiting member is located at an opening of the second limiting member, one end of the reset member abuts against the second limiting member, and the other end of the reset member abuts against the third limiting member.

With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein the lance body is provided with a groove for installing the third limiting element, and the third limiting element does not protrude from the lance body.

With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein the outer wall of the spear is provided with a positioning piece connected with the inner wall of the object to be salvaged.

With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein the lance body includes a connecting section, a neck section, and a frustum section, which are sequentially arranged;

the through hole is arranged on the connecting section, and the supporting part is arranged on the frustum section;

the diameter of the connecting section is larger than that of the neck section, and the diameter of the frustum section is not smaller than that of the neck section.

With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein a fourth limiting member capable of abutting against the limiting portion is disposed on the connecting segment, and the second limiting member is located between the first limiting member and the fourth limiting member.

In a second aspect, the embodiment of the invention provides a fishing device, which comprises the fishing spear.

Has the advantages that:

the invention provides a fishing spear which comprises a spear body and a spear claw sleeved outside the spear body in a sliding manner; one end of the outer wall of the spear body is provided with a first limiting piece, the other end of the outer wall of the spear body is provided with a supporting part for expanding a spear claw, the spear claw is positioned between the first limiting piece and the supporting part, the first limiting piece can be abutted against the spear claw when the spear body is pressed downwards, and the supporting part can be abutted against the inner wall of the spear claw when the spear body is lifted upwards; the spear body is provided with a through hole, the through hole is internally provided with a second limiting part, the spear body is internally sleeved with a trigger which can enable the second limiting part to protrude out of the outer wall of the spear body, one end, far away from the supporting part, of the spear claw is provided with a limiting part which can be abutted against the second limiting part, and when the second limiting part is abutted against the limiting part, the supporting part is not in contact with the spear claw.

When fishing is carried out, the lance body is pressed to move downwards, the first limiting piece on the lance body presses the lance claw to move downwards, so that the lance claw is contracted to enter the object to be fished, then the lance body is lifted upwards, the lance body moves upwards relative to the lance claw in the process of lifting the lance body, so that the supporting part on the lance body is abutted against the inner wall of the lance claw to prop open the lance claw, the lance claw is abutted against the inner wall of the object to be fished tightly, and then the lance body is lifted continuously to lift the object to be fished; when the object to be fished cannot be lifted out of the oil well, the operator moves the lance body downwards to enable the supporting portion on the lance body to not prop open the lance claw any more, then the trigger is triggered, the second limiting part in the lance body protrudes out of the lance body through the trigger, then the operator lifts the lance body again, the second limiting part can be abutted against the limiting portion at the end of the lance claw, the lance claw cannot be in contact with the supporting portion, and therefore the operator can conveniently pull the fishing lance out of the oil well.

The invention provides a fishing device which comprises a fishing spear. The fishing device has the advantages compared with the prior art, and the detailed description is omitted.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a partial cross-sectional view of a fishing spear in accordance with an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a spear in the fishing spear according to the embodiment of the present invention;

fig. 3 is a schematic view illustrating the fishing spear according to the embodiment of the present invention after the spear body is installed with the second position limiting member;

FIG. 4 is a cross-sectional view A-A of FIG. 1;

FIG. 5 is an enlarged view of a portion of FIG. 1 at B;

fig. 6 is a schematic structural view of a ball seat in the fishing spear according to an embodiment of the present invention;

fig. 7 is a partial structural sectional view of the fishing spear provided in the embodiment of the present invention.

Icon:

100-a lance body; 101-a first limit stop; 102-a support; 103-a through hole; 104-a groove; 110-a second limit stop; 120-a third stop; 130-a reset piece; 140-a connecting segment; 141-a fourth limit; 150-a neck reduction section; 160-frustum section;

200-a lance; 210-a limiting part; 220-a positioning element;

300-a trigger; 310-a ball seat; 311-large diameter section; 312-small diameter section; 313-a pushing part; 314-a connector; 320-sphere.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "back", "top", "bottom", "inner", "outer", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, are used for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.

Referring to fig. 1 and 5, the present embodiment provides a fishing spear, which includes a spear body 100 and a spear 200 slidably sleeved outside the spear body 100; the outer wall of the lance body 100 is provided with a first limiting part 101, the outer wall of the lance body 100 is further provided with a supporting part 102 for expanding the lance 200, the lance 200 is positioned between the first limiting part 101 and the supporting part 102, the first limiting part 101 can be abutted with the lance 200 when the lance body 100 is pressed downwards, and the supporting part 102 can be abutted with the lance 200 when the lance body 100 is lifted upwards; the lance body 100 is provided with a through hole 103, the through hole 103 is located between the first limiting member 101 and the supporting portion 102, the second limiting member 110 is installed at the through hole 103, the trigger 300 capable of enabling the second limiting member 110 to protrude out of the lance body 100 is sleeved in the lance body 100, one end of the lance 200, far away from the supporting portion 102, is provided with a limiting portion 210 capable of abutting against the second limiting member 110, and when the second limiting member 110 abuts against the limiting portion 210, the supporting portion 102 is not in contact with the lance 200.

When fishing is carried out, the lance body 100 is pressed downwards, the first limiting part 101 on the lance body 100 presses the lance 200 downwards so that the lance 200 is contracted into the object to be fished, then the lance body 100 is lifted upwards, the lance body 100 moves upwards relative to the lance 200 in the process of lifting the lance body 100 so that the supporting part 102 on the lance body 100 is abutted against the inner wall of the lance 200 to expand the lance 200, the lance 200 is abutted against the inner wall of the object to be fished, and then the object to be fished can be lifted out by continuously lifting the lance body 100; when the object to be fished cannot be lifted out of the oil well, the operator moves the spear body 100 downwards to enable the supporting part 102 on the spear body 100 to not expand the spear 200 any more, then the trigger 300 is triggered, the second limiting part 110 in the spear body 100 protrudes out of the spear body 100 through the trigger 300, then the operator lifts the spear body 100 again, the second limiting part 110 can be abutted against the limiting part 210 at the end part of the spear 200, and the spear 200 cannot be contacted with the supporting part 102 at the moment, so that the operator can conveniently withdraw the fishing spear out of the oil well.

Specifically, the support portion 102 on the lance body 100 can spread the lance 200, and the diameter of the support portion 102 gradually increases in a direction away from the lance 200, so that when the lance 200 moves toward the support portion 102, one end of the support portion 102 close to the lance 200 can abut against an inner wall of the lance 200, and with the movement of the lance 200, the support portion 102 can be inserted inside the lance 200, and the support portion 102 completely spreads the lance 200.

When the lance 200 is slidably fitted over the lance body 100, the range of movement of the lance 200 is restricted by the support portion 102 and the first stopper 101 to prevent the lance 200 from disengaging from the lance body 100. When the trigger 300 triggers the second limiting member 110, the second limiting member 110 can abut against the limiting portion 210 of the spear 200, and the abutment of the second limiting member 110 and the limiting portion 210 can prevent the spear 200 from abutting against the supporting portion 102, so that the spear 200 is not spread in the lifting process, and the spear body 100 can drive the spear 200 to withdraw from the object to be fished.

It should be noted that the term "object to be salvaged" refers to a pipe string or a tubular tool that is to be salvaged to the surface in an oil well.

It should be noted that when the lances 200 enter the object to be salvaged along with the lance body 100, the lances 200 are pressed, so that friction is generated between the lances 200 and the inner wall of the object to be salvaged. Referring to fig. 1, 5 and 7, in an alternative embodiment of the present embodiment, the trigger 300 includes a ball seat 310 and a ball 320, the ball 320 sealing the ball seat 310; the ball seat 310 is provided with a pushing part 313 for pushing the second limiting part 110; ball seat 310 is connected to the lance body 100 by a connector 314, and ball seat 310 can slide axially along lance body 100 when connector 314 is cut; when the ball seat 310 slides away from the first stopper 101, the pushing portion 313 can push the second stopper 110 to protrude out of the outer wall of the lance body 100.

Specifically, ball seat 310 is disposed within lance body 100 via connector 314, and connector 314 is shearable, so that ball seat 310 is not triggered during normal fishing operations. When the object to be fished cannot be fished out, a worker drops the ball 320 into the lance body 100, injects water into the lance body 100 and presses the ball seat 310, the ball seat 310 is driven by the pressure of the liquid to shear the connecting member 314, so that the ball seat 310 can move downward relative to the lance body 100, and in the process of moving the ball seat 310 downward, the pushing part 313 on the ball seat 310 can push the second limiting part 110, so that the second limiting part 110 protrudes out of the lance body 100, and the second limiting part 110 can abut against the limiting part 210.

It should be noted that the ball 320 may be a steel ball.

Referring to fig. 1 and 6, in an alternative embodiment, ball seat 310 includes a major diameter section 311 and a minor diameter section 312; the large diameter section 311 is connected with the lance body 100 through a connecting piece 314, and the outer wall of the small diameter section 312 abuts against the second limiting piece 110; the transition between the large-diameter section 311 and the small-diameter section 312 forms a pushing portion 313.

Specifically, the large-diameter section 311 and the small-diameter section 312 are fixedly connected, and the diameter of the transition portion between the large-diameter section 311 and the small-diameter section 312 gradually decreases along the direction from the large-diameter section 311 to the small-diameter section 312, so that the second limiting member 110 can smoothly slide from the small-diameter section 312 to the large-diameter section 311.

Referring to fig. 1, 2 and 3, in an alternative of the present embodiment, a third limiting member 120 is detachably disposed on the lance body 100 at the through hole 103, and a reset member 130 is disposed between the second limiting member 110 and the third limiting member 120; under the action of the reset member 130, the second limiting member 110 always tends to be far away from the third limiting member 120.

Specifically, the third limiting member 120 is fixedly disposed at the through hole 103 on the outer wall of the lance body 100, the reset member 130 is disposed between the second limiting member 110 and the third limiting member 120, when the trigger 300 is not triggered, the second limiting member 110 is pressed away from the third limiting member 120 under the action of the reset member 130, and the second limiting member 110 does not protrude out of the lance body 100; when the trigger 300 is triggered, the pushing portion 313 pushes the second limiting member 110 to move toward the third limiting member 120, the reset member 130 between the second limiting member 110 and the third limiting member 120 is compressed, and the second limiting member 110 can protrude out of the lance body 100.

Wherein, the reset member 130 may adopt a reset spring.

Referring to fig. 1 and 4, in an alternative embodiment, the second limiting member 110 is U-shaped, the third limiting member 120 is straight, the third limiting member 120 is located at an opening of the second limiting member 110, and one end of the restoring member 130 abuts against the second limiting member 110, and the other end abuts against the third limiting member 120.

Specifically, the second limiting member 110 is set in a U shape, and the third limiting member 120 corresponds to the opening of the second limiting member 110, so that when the trigger 300 is not triggered, the reset member 130 can make the second limiting member 110 far away from the third limiting member 120, and when the trigger 300 is triggered, the second limiting member 110 can be close to the third limiting member 120.

Referring to fig. 1, 2 and 3, in an alternative embodiment, the lance body 100 is provided with a groove 104 for installing the third limiting member 120, and the third limiting member 120 does not protrude from the lance body 100.

The opening of the groove 104 can prevent the third retaining member 120 from protruding out of the lance body 100, so that the third retaining member 120 does not erroneously contact the retaining portion 210 of the lance 200.

Referring to fig. 1, in an alternative embodiment, the outer wall of the spear 200 is provided with a retainer 220 connected to the inner wall of the object to be salvaged.

It should be noted that, the inner walls of the objects to be salvaged are all provided with salvage grooves, and after the lances 200 are deep into the inner walls of the objects to be salvaged, the positioning members 220 on the lances 200 can be embedded into the salvage grooves, so that after the lances 200 are spread, the lances 200 cannot slide and displace with the objects to be salvaged, and normal salvage operation is ensured.

Also, even if the object to be salvaged cannot be lifted, the lances 200 do not slidably displace with the object to be salvaged, so that the worker can clearly know that the object to be salvaged cannot be salvaged, thereby withdrawing the lance body 100.

It should be noted that the positioning member 220 may be a positioning table.

Referring to fig. 1, 2 and 3, in an alternative embodiment, the lance body 100 includes a connecting section 140, a neck section 150 and a frustum section 160 arranged in this order; the through hole 103 is arranged on the connecting section 140, and the supporting part 102 is arranged on the frustum section 160; the diameter of connecting section 140 is greater than the diameter of neck section 150, and the diameter of frustum section 160 is no less than the diameter of neck section 150.

Specifically, when the spear 200 enters the object to be salvaged along with the spear 100, the spear 200 will rub against the inner wall of the object to be salvaged, so that under the action of friction, the spear 200 can abut against the first stopper 101 on the spear 100, and one end of the spear 200 away from the connecting section 140 will fall on the neck-reduced section 150, and under the compression of the object to be salvaged, the spear 200 will be compressed, and at this time, the compressed part of the spear 200 will be on the neck-reduced section 150, so as to prevent the spear 200 from pressing the spear 100, and prevent the spear 100 from being damaged.

And the support portion 102 is provided on the frustum section 160, the support portion 102 on the frustum section 160 can spread the lances 200 when the lances 100 are lifted up.

It should be further noted that rib plates for transmitting torque are further disposed on the frustum section 160, when the spear 200 contacts the supporting portion 102, the position of the spear 200 corresponds to the position of the rib plates, when the operator rotates the spear body 100, the spear 200 can abut against the rib plates, and the spear body 100 can rotate the spear 200 through the rib plates, so as to rotate the object to be fished.

Referring to fig. 1, 2 and 3, in an alternative of the present embodiment, a fourth limiting member 141 capable of abutting against the limiting portion 210 is disposed on the connecting segment 140, and the second limiting member 110 is located between the first limiting member 101 and the fourth limiting member 141.

Specifically, the fourth stopper 141 provided on the connecting section 140 can limit the maximum downward movement distance of the lance 200 relative to the lance body 100, prevent the supporting portion 102 from excessively expanding the lance 200, and prevent the lance 200 from being disengaged from the lance body 100.

The embodiment provides a fishing device, which comprises a fishing spear. The fishing device has the advantages compared with the prior art, and the detailed description is omitted.

The fishing device further comprises a ground tool and a service pipe column, the service pipe column is connected with the ground tool, a worker sends the fishing spear into the well through the service pipe column, and the fishing spear is assisted to conduct fishing work through the service pipe column and the ground tool.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.