CN114482898A - Fishing tool for sucker rod with fracture reducing shoulder - Google Patents
Fishing tool for sucker rod with fracture reducing shoulder Download PDFInfo
- Publication number
- CN114482898A CN114482898A CN202011166764.XA CN202011166764A CN114482898A CN 114482898 A CN114482898 A CN 114482898A CN 202011166764 A CN202011166764 A CN 202011166764A CN 114482898 A CN114482898 A CN 114482898A
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- locking
- claw
- pipe
- sucker rod
- fishing
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- 210000000078 claw Anatomy 0.000 claims abstract description 186
- 230000002441 reversible effect Effects 0.000 claims abstract description 60
- 208000010392 Bone Fractures Diseases 0.000 claims description 15
- 206010017076 Fracture Diseases 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 14
- 230000001154 acute effect Effects 0.000 claims description 6
- 208000002103 Shoulder Fractures Diseases 0.000 claims description 5
- 208000031294 Upper limb fractures Diseases 0.000 claims description 5
- 230000000670 limiting effect Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 230000009471 action Effects 0.000 description 13
- 239000011324 bead Substances 0.000 description 9
- 230000007246 mechanism Effects 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
- E21B31/18—Grappling tools, e.g. tongs or grabs gripping externally, e.g. overshot
Abstract
The invention relates to a fishing tool for a sucker rod with a broken reducing shoulder, which comprises an upper joint, a fishing barrel and a locking claw, wherein the fishing barrel is connected with the upper joint, and the inner circle and the outer circle of a locking tooth ring are respectively provided with a locking tooth in the locking tooth ring and a spiral tooth-shaped conical surface; the outer surface of the claw body of the locking claw is provided with reverse locking teeth which can be matched with the reverse locking teeth on the inner circle at the lower part of the overshot; the locking claw is fixed in the overshot through a shear pin after being in threaded connection with the locking pipe, the locking tooth ring is installed between the upper connector and the locking pipe, and the spiral tooth-shaped conical surface of the locking tooth ring can be connected with the spiral tooth-shaped inner conical surface of the inner circle of the upper portion of the overshot. The invention can be used for salvaging the sucker rod string which falls into the production oil pipe after the reducing shoulder is broken, has reliable and stable working performance, can reliably complete the whole process of entering and firmly locking the well-falling sucker rod shoulder by one-time downward impact, and well solves the technical problem that the existing sucker rod reducing shoulder is broken and falls into the production oil pipe for salvaging. Can effectively improve and salvage the efficiency of construction.
Description
Technical Field
The invention relates to a fishing device for sucker rod strings in production tubing in a petroleum industry well, in particular to a fishing tool for a sucker rod with a fracture reducing shoulder.
Background
Along with the wide use of the lining oil pipe, the well shut-in problem caused by the broken and disengaged sucker rod in the oil pipe becomes more prominent, and along with the increase of small cased wells, "the broken and disengaged sucker rod" and "the sucker rod salvage" in the lining pipe and the small oil pipe with the shortened sucker rod salvage channel are the problems which need to be researched and solved urgently in the aspect of controlling the lying well at present, and particularly, the salvage operation of the broken part of the reducing shoulder at the end part of the sucker rod in the lining oil pipe and the small oil pipe is particularly difficult.
At present, the broken sucker rod fishing tools at the reducing circular bead of the sucker rod are fished in small fishing channels such as a lining, and the fishing tools have the following characteristics through retrieval:
1. the application numbers are: CN201220555155.8, patent name: the invention relates to a sucker rod fisher for lining an oil pipe, which comprises a fishing joint, a fishing barrel, a spring, a lock sleeve and a restraining ring, wherein the upper part of the fishing joint is provided with sucker rod threads, the lower part of the fishing barrel is milled with a plurality of slots, the lower parts of the slots are milled to form a strip body, the lower part of the fishing barrel is connected with the upper part of the fishing barrel, the spring and the lock sleeve are sleeved outside the fishing barrel, the lower end surface of the fishing joint presses the upper end surface of the spring, the lower end surface of the spring presses the upper end surface of the lock sleeve, an inner shoulder of the lock sleeve is seated on an outer shoulder at the lower part of the fishing barrel, the inner wall below the inner shoulder of the lock sleeve wraps the lower part of the fishing barrel, an expanding cavity is arranged inside the fishing barrel, and the restraining ring is positioned in the expanding cavity. The lock sleeve locks the diameter expanding cavity in advance, so that the diameter reducing shoulder of the sucker rod cannot enter the diameter expanding cavity, and the fishing fails; the lock sleeve of the fishing tool is also possibly blocked by the inner wall of the oil pipe after the reducing shoulder of the sucker rod enters the diameter expanding cavity and cannot move downwards, so that the locking cannot be reliably realized, the fishing failure is caused, and the fishing tool is unreliable.
2. The application numbers are: CN201520145784.7, patent name: a sucker rod fisher comprises a fishing joint, a connecting pin and a lock sleeve, wherein a plurality of slots are uniformly milled on the fishing joint, the rest part is a strip body, sliding grooves are formed on part of the strip body of the fishing joint, a plurality of empty grooves are formed on the lock sleeve, the number of the empty grooves is the same as that of the strip body, the rest part of the lock sleeve where the empty grooves are formed is a vertical rib, the width of the empty groove is larger than that of the strip body, the width of the vertical rib is smaller than that of the slot, the fishing joint and the lock sleeve are spliced together, the vertical rib enters the slot, the strip body enters the empty groove, the connecting pin enters a screw hole fixed at the upper part of the lock sleeve from the sliding groove, the pin can slide up and down in the sliding groove, the fishing joint and the lock sleeve are spliced together, each part is a single layer, therefore, the outer diameter can be reduced, the bottom taper of the empty groove of the lock sleeve can not be processed, the strip body of the fishing joint has no shoulder and no lock teeth, even if the sucker rod can be gripped, the sucker rod cannot be salvaged because the sucker rod cannot bear the load.
3. The invention has the following application numbers: CN201520795133.2, patent name: the invention discloses a sucker rod fisher for an oil field lining oil pipe, which is characterized in that a groove is arranged in the lower part of a claw-shaped fishing barrel, a hanging shoulder is formed between the lower end of the groove and the inner wall of the claw-shaped fishing barrel, a limiting mechanism is arranged in the claw-shaped fishing barrel, the limiting mechanism enables the interior of the claw-shaped fishing barrel to be small and can block the upper end part of a fished sucker rod, the inner shoulder of the upper part of the claw-shaped fishing barrel is hung on a hanging rod, the upper part of the hanging rod is connected with an upper connector, a lock sleeve is sleeved outside the claw-shaped fishing barrel, and a pin temporarily connects the lock sleeve and the claw-shaped fishing barrel together. The device limits the upward movement of the sucker rod by means of the limit nail mechanism, but the position of the limit nail mechanism is fixed, and the distance between the fracture part of the sucker rod and the shoulder part is different in different oil wells, so that the device is difficult to adapt to the fishing of the actual fracture shoulder in the well, and in addition, an outer lock sleeve can move up and down after the lock sleeve lock nail is sheared, is not reliably locked, and has unreliability in the process of pulling out the sucker rod string.
Fishing tools for sucker rod strings that have broken at the downhole reducing shoulder need further improvement.
Disclosure of Invention
The invention aims to provide a fishing tool for a sucker rod with a fractured reducing shoulder, which is used for fishing a broken underground sucker rod string from the reducing shoulder and solves the problem that the existing fishing tool cannot reliably fish the broken and broken underground sucker rod string. The reliability of salvaging operation work is ensured, the salvaging efficiency and the salvaging success rate are improved, and the operation cost is reduced.
The technical solution of the invention is as follows:
the utility model provides a fishing tool of reducing circular bead fracture sucker rod, includes top connection, overshot and locking claw, overshot and top connection, wherein:
the inner circle and the outer circle of the locking tooth ring are respectively provided with a locking tooth in the locking tooth ring and a spiral tooth type conical surface;
the outer circle of the upper part of the lock tube is provided with locking teeth matched with the locking teeth in the locking tooth ring, and the lower part of the lock tube is in threaded connection with the lock claw;
the outer surface of the claw body of the locking claw is provided with reverse locking teeth which can be matched with the reverse locking teeth on the inner circle at the lower part of the overshot;
the locking claw is fixed in the overshot through a shear pin after being in threaded connection with the locking pipe, the locking tooth ring is installed between the upper connector and the locking pipe, and the spiral tooth-shaped conical surface of the locking tooth ring can be connected with the spiral tooth-shaped inner conical surface of the inner circle of the upper portion of the overshot.
The locking teeth in the locking tooth ring of the inner circle of the locking tooth ring are reverse locking teeth, and the spiral tooth-shaped conical surface on the outer surface of the locking tooth ring is a reverse locking spiral tooth-shaped inclined surface or more than two reverse locking spiral tooth-shaped inclined surfaces.
The excircle of lock pipe is the non-isodiametric excircle, upper portion excircle is less than the middle part excircle and is equipped with on the excircle of upper portion and detains instrument connection structure, the middle part external diameter is less than the lower part external diameter and be equipped with lock tooth intra-annular locking tooth matched with locking tooth, the lower part excircle is equipped with spacing step and the lower part is interior to be equipped with the screw thread and is connected with the lock claw.
The upper portion inner chamber of an overshot is equipped with the screw thread and is connected with the top connection, and the middle part body of an overshot is equipped with the shear pin hole and penetrates the shear pin be equipped with the spacing step that spacing step and lock pipe lower part excircle cooperate in the inner chamber of an overshot below the shear pin, the lower part inner chamber of an overshot is equipped with lock claw body cooperation chamber and is equipped with the reverse locking tooth matched with of the reverse locking tooth of claw body surface in the inner chamber of this lock claw body cooperation chamber below.
The locking claw is provided with a locking claw body, an impact cavity and a claw body, and a small-diameter section at the upper part of the locking claw body is provided with threads and connected with a locking pipe; the conical section of the excircle of the middle part of the locking claw body is matched with a locking claw body matching cavity of the overshot, reverse locking teeth are arranged on the excircle of the lower part of the locking claw body and the outer surface of the claw body, and the inner cavity of the locking claw body is a horn-shaped impact cavity; the claw body is arranged below the impact cavity of the locking claw body, an inner claw is further arranged on the inner wall of the lower end of the claw body, and an included angle alpha between an upper inclined plane of a claw projection of the inner claw and an axis is an acute angle smaller than 90 degrees.
The inner cavity of the upper joint is provided with internal threads which can be connected with a connecting pipe and can be connected with a fishing rod column through the connecting pipe, and a liquid drainage channel is arranged in a pipe body of the connecting pipe; the body both ends of connecting pipe are equipped with internal thread and external screw thread respectively, can mutual threaded connection between the connecting pipe and can confirm the length of connecting or connect the radical according to the distance between the sucker rod reducing circular bead to the sucker rod fracture position of falling in the well.
The utility model provides a fishing tool of reducing circular bead fracture sucker rod includes top connection, a fishing barrel and locking claw, and a fishing barrel and top connection, wherein:
the inner circle and the outer circle of the locking tooth ring are respectively provided with a locking tooth in the locking tooth ring and a spiral tooth type conical surface;
the middle pipe body of the lock pipe is provided with locking teeth matched with the locking teeth in the locking tooth ring, and the lower pipe body is provided with a locking claw nut and can suspend a locking claw;
the outer circle of the lower part of the locking claw is provided with a reverse locking tooth and can be matched with the reverse locking tooth of the inner circle of the lower part of the overshot;
the outer circle of the lower portion of the lock tube is hung with the lock claw, the lock claw nut is installed on the outer circle of the lower portion of the lock tube and then installed in the overshot through the shear pin, the lock tooth ring is installed between the upper connector and the lock tube, and the spiral tooth type conical surface of the lock tooth ring can be connected with the spiral tooth type inner conical surface of the inner circle of the upper portion of the overshot.
The locking teeth in the locking tooth ring of the inner circle of the locking tooth ring are reverse locking teeth, and the spiral tooth-shaped conical surface on the outer surface of the locking tooth ring is a reverse locking spiral tooth-shaped inclined surface or more than two reverse locking spiral tooth-shaped inclined surfaces.
The outer circle of the locking pipe is a non-isometric outer circle, the upper outer circle is smaller than the middle outer circle, an upper buckling tool connecting structure is arranged on the upper outer circle, the middle outer circle is smaller than the lower outer circle and is provided with locking teeth matched with the locking teeth in the locking tooth ring, the lower outer circle is provided with threads which can be connected with a locking claw nut, and the lower outer circle is provided with a hanging step which can hang a locking claw; the lower inner cavity of the lock tube is a horn-shaped impact cavity.
The inner chamber of the upper portion of the overshot is provided with threads and is connected with the upper joint, the body of the middle portion of the overshot is provided with a shear pin hole for penetrating a shear pin, a locking claw nut matching chamber and a locking claw nut matching chamber are arranged in the inner chamber of the overshot below the shear pin, and reverse locking teeth matched with reverse locking teeth of an excircle of the lower portion of the locking claw are arranged below the locking claw nut matching chamber.
The locking claw is provided with a locking claw body and a claw body, and the locking claw body can be hung on a hanging step on the outer circle of the lower part of the locking pipe and can rotate around the locking pipe; the outer circle of the lower portion of the locking claw body is provided with reverse locking teeth, the claw body is arranged on the lower portion of the locking claw body, an inner clamping claw is further arranged on the inner wall of the lower end of the claw body, and an included angle alpha between an upper inclined plane of a claw projection of the inner clamping claw and the axis is an acute angle smaller than 90 degrees.
The inner cavity of the upper joint is provided with internal threads which can be connected with a connecting pipe and can be connected with a fishing rod column through the connecting pipe, and a liquid drainage channel is arranged in a pipe body of the connecting pipe; the body both ends of connecting pipe are equipped with internal thread and external screw thread respectively, can mutual threaded connection between the connecting pipe and can confirm the length of connecting or connect the radical according to the distance between the sucker rod reducing circular bead to the sucker rod fracture position of falling in the well.
The invention has the following remarkable using effects:
the invention provides a fishing tool of a reducing shoulder fracture sucker rod with two structures, one is an integral type of an impact cavity and a locking claw, and the other is a split type of the impact cavity and the locking claw.
The invention with two structures can be connected with a fishing pipe column through a connecting pipe with a liquid drainage channel. After the connecting pipe is connected between the fishing pipe column and the invention, the liquid in the fishing pipe column can be discharged at any time, thus creating more favorable working conditions for the downward impact fishing falling well sucker rod of the invention.
When the fishing pipe column is brought to be close to the reducing shoulder of the sucker rod of a falling well, the fishing tool is released freely, namely when the fishing tool is close to the top of the broken rod and the broken end of the broken rod is away from the top by a certain free falling acceleration distance, the ground does not need to brake to control the descending speed, the fishing rod column is accelerated to fall under the action of the gravity of the fishing rod column, the broken sucker rod enters the fishing tool under the driving of the downward impact force of the fishing rod column, and the liquid stored in the inner cavity of the fishing tool is quickly discharged from the liquid discharge channel of the connecting pipe. The fishing tool impacts downwards, huge impact force acts on the broken diameter-changing shoulders of the sucker rod, the process that the diameter-changing shoulders expand the locking claw and enter the locking claw, the broken rod diameter-changing shoulders push the impact cavity to move upwards to cut off the shear pin, the locking pipe moves upwards to enter the upper locking tooth ring, the locking claw and the diameter-changing shoulders completely enter the fishing barrel body is completed, and the locking pipe is engaged with the reverse locking teeth in the fishing barrel and then is locked and cannot move downwards. And then lifting the fishing rod column and driving the fishing tool and the well-falling sucker rod column to move upwards, wherein the diameter-changing shoulder part of the sucker rod relatively moves downwards, and the locking claw is pushed to the inner wall of the fishing barrel under the action of the claw convex inclined plane of the inner claw of the locking claw. The locking claw is firmly locked in the inner wall of the overshot under the action of the locking tooth which is opposite to the inner wall of the overshot. Because the restriction of the inner wall of the fishing barrel and the diameter formed by the claw body at the bottom of the locking claw are smaller than the diameter of the reducing circular bead of the sucker rod, the fishing tool drives the circular bead of the sucker rod to break, and the construction work of pulling out the sucker rod string falling into the well is completed.
The invention can be used for salvaging the sucker rod string which falls into the production oil pipe after the reducing shoulder is broken, has reliable and stable working performance, and can reliably complete the whole process of entering and firmly locking the well-falling sucker rod shoulder by one-time downward impact. In addition, the connecting pipe connected above the fishing tool can rapidly remove liquid in the fishing tool when impacting downwards, reduces liquid resistance, enables fishing to be more reliable and stable, and well solves the technical problem that the fracture of the reducing shoulder of the existing sucker rod falls into the production oil pipe for fishing. Can effectively improve the fishing construction efficiency, reduce the operation cost and obviously improve the economic benefit.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of the structure of the present invention.
Fig. 2 is a schematic structural diagram of another embodiment of the present invention.
Fig. 3 is a schematic structural view of the locking ring in fig. 1 and 2.
Fig. 4 is a schematic view of the structure of the locking pawl of fig. 1.
Fig. 5 is a schematic view of the structure of the locking pawl of fig. 2.
Fig. 6 is a schematic view of the structure of the connection pipe.
Fig. 7 is an enlarged partial view of the internal tapered surface of the helical thread of the locking ring and the overshot of fig. 1.
Fig. 8 is an enlarged partial view of the counter locking teeth of the overshot of fig. 1.
Note that: to better illustrate the structure of the connector, FIG. 6 shows the connector tube body cut away at the top.
Detailed Description
The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present disclosure. The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the 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 order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1, 3, 4, 6, 7 and 8, a fishing tool with a variable diameter shoulder and a broken sucker rod comprises an upper joint 11, an overshot 15 and a locking claw 16, wherein the overshot 15 is connected with the upper joint 11, and the following steps:
the inner circle and the outer circle of the locking tooth ring 12 are respectively provided with a locking tooth 122 in the locking tooth ring and a spiral tooth type conical surface 121;
the outer circle of the upper part of the lock tube 14 is provided with locking teeth matched with the locking teeth 122 in the locking teeth ring, and the lower part of the lock tube is in threaded connection with the locking claws 16;
the outer surface of the claw body 162 of the locking claw 16 is provided with reverse locking teeth which can be matched with the reverse locking teeth on the inner circle of the lower part of the overshot 15;
the locking claw 16 is fixed in the overshot 15 through the shear pin 13 after being in threaded connection with the locking tube 14, the locking tooth ring 12 is installed between the upper connector 11 and the locking tube 14, and the spiral tooth-shaped conical surface 121 of the locking tooth ring 12 can be connected with the spiral tooth-shaped inner conical surface 151 of the inner circle of the upper part of the overshot 15. When the fishing pipe column carrying the fishing rod is impacted downwards to clamp the sucker rod broken from the reducing shoulder into the locking claw 16, the locking pipe 14 shears the shear pin 13 to move upwards into the locking tooth ring 12 under the action of counterforce, and the shear pin is locked by the locking tooth 122 in the locking tooth ring and cannot move downwards, so that the sucker rod falling into the well is fished.
The locking teeth 122 in the locking teeth ring of the inner circle of the locking teeth ring 12 are reverse locking teeth, the spiral tooth-shaped conical surface 121 on the outer surface of the locking teeth ring 12 is a reverse locking spiral tooth-shaped inclined surface or more than two reverse locking spiral tooth-shaped inclined surfaces, the spiral tooth-shaped conical surface 121 is matched with the spiral tooth-shaped inner conical surface 151 in the fishing barrel 15, when the locking teeth ring 12 is stressed downwards, the spiral tooth-shaped conical surface 121 is retracted under the action of the spiral tooth-shaped inner conical surface 151 matched with the spiral tooth-shaped conical surface 121, and the diameter of the locking teeth ring 12 is forced to be reduced so as to lock the locking pipe 14 in the locking teeth ring.
The excircle of lock pipe 14 is the non-isodiametric excircle, and upper portion excircle is less than the middle part excircle and is equipped with upper lock instrument connection structure, and the middle part external diameter is less than the lower part external diameter and is equipped with and locks the locking tooth that the internal locking tooth 122 matched with of tooth ring, and the lower part excircle is equipped with spacing step and the lower part is interior to be equipped with the screw thread and is connected with lock claw 16.
The upper portion inner chamber of an overshot 15 is equipped with the screw thread and is connected with top connection 11, and the middle part body of an overshot 15 is equipped with the shear pin hole and penetrates shear pin 13 be equipped with spacing step and the spacing step cooperation of the excircle of lock pipe 14 lower part in the inner chamber of an overshot 15 below shear pin 13, the lower part inner chamber of an overshot 15 is equipped with lock claw body cooperation chamber and is equipped with the reverse locking tooth matched with the reverse locking tooth of claw body 162 surface in the inner chamber of this lock claw body cooperation chamber below.
The locking claw 16 is provided with a locking claw body 161, an impact cavity 18 and a claw body 162, and a small-diameter section at the upper part of the locking claw body 161 is provided with threads to be connected with the locking pipe 14; the conical section of the excircle in the middle of the locking claw body 161 is matched with the locking claw body matching cavity of the overshot 15, reverse locking teeth are arranged on the excircle in the lower part of the locking claw body 161 and the outer surface of the claw body 162, and the inner cavity of the locking claw body 161 is a horn-shaped impact cavity 18; the claw body 162 is arranged below the impact cavity 18 of the claw body 161, an inner claw 163 is further arranged on the inner wall of the lower end of the claw body 162, and an included angle alpha between an upper claw convex inclined surface of the inner claw 163 and an axis is an acute angle smaller than 90 degrees.
The inner cavity of the upper joint 11 is provided with internal threads which can be connected with a connecting pipe 51 and can be connected with a fishing rod through the connecting pipe 51, and a liquid drainage channel 511 is arranged in the pipe body of the connecting pipe 51; internal threads and external threads are respectively arranged at two ends of a pipe body of the connecting pipe 51, the connecting pipes 51 can be in threaded connection with each other, and the length or the number of the connecting pipes can be determined according to the distance from the broken part of the well-falling sucker rod to the reducing shoulder of the sucker rod. In order to show the structure of the connection pipe 51, the upper portion of the connection pipe 51 is cut and sectioned in fig. 6.
When the fishing rod column approaches a broken sucker rod in a well during fishing, the fishing rod column is released freely, when the fishing rod column is flushed to the broken sucker rod reducing shoulder along with the fishing rod column, the reducing conical surface of the sucker rod shoulder expands the locking claw 16, the sucker rod reducing shoulder enters the locking claw 16, the broken rod reducing shoulder pushes the impact cavity 18 and the locking pipe 14 to go upward to cut off the shear pin 13, the locking pipe 14 continues to go upward to enter the upper locking tooth ring 12, and at the moment, the locking claw 16 and the sucker rod reducing shoulder completely enter the fishing barrel 15.
Then, the fishing rod column is lifted up to drive the fishing tool to move upwards, the locking pipe 14 relatively moves downwards to drive the locking tooth ring 12 to move downwards, and at the moment, the locking tooth ring 12 is retracted inwards under the action of the spiral tooth-shaped conical surface 121 on the outer surface of the locking tooth ring and the spiral tooth-shaped inner conical surface 151 in the fishing barrel 15, so that the locking pipe 14 is firmly locked in the fishing barrel 15. At this time, the reducing shoulder part of the well-falling sucker rod relatively moves downwards, the locking claw 16 is pushed to the inner wall of the overshot 15 under the action of the inner claw 163 at the lower end of the locking claw body 161, and the locking claw 16 is firmly locked in the inner wall of the overshot 15 due to the action of the reverse locking tooth on the outer surface of the claw body 162 at the lower part of the locking claw body 161 and the reverse locking tooth on the inner wall of the lower part of the overshot 15 corresponding to the reverse locking tooth. Because the inner wall of the fishing barrel 15 is restrained, the diameter of the bottom of the locking claw 16 is smaller than the diameter of the reducing circular bead of the well-falling sucker rod, the fishing tool drives the broken end of the circular bead of the well-falling sucker rod to go upwards, and the construction operation of the falling sucker rod string is completed.
Described below is the invention in another configuration:
referring to fig. 2, 3, 5 and 6, a fishing tool for a sucker rod with a fractured reducing shoulder comprises an upper joint 11, an overshot 15 and a locking claw 16, wherein the overshot 15 is connected with the upper joint 11, and the fishing tool comprises:
the inner circle and the outer circle of the locking tooth ring 12 are respectively provided with a locking tooth 122 in the locking tooth ring and a spiral tooth type conical surface 121;
the middle pipe body of the lock pipe 14 is provided with locking teeth matched with the locking teeth 122 in the locking tooth ring, and the lower pipe body is provided with a lock claw nut 17 and can suspend a lock claw 16;
the outer circle of the lower part of the locking claw 16 is provided with a reverse locking tooth and can be matched with the reverse locking tooth of the inner circle of the lower part of the overshot 15;
the locking claw 16 is hung on the outer circle of the lower portion of the locking pipe 14, the locking claw nut 17 is installed on the outer circle of the lower portion of the locking pipe, the locking claw nut is installed in the overshot 15 through the shear pin 13, the locking tooth ring 12 is installed between the upper connector 11 and the locking pipe 14, and the spiral tooth-shaped conical surface 121 of the locking tooth ring 12 can be connected with the spiral tooth-shaped inner conical surface 151 of the inner circle of the upper portion of the overshot 15. When the fishing pipe column carrying the fishing rod is impacted downwards to clamp the sucker rod broken from the reducing shoulder into the locking claw 16, the locking pipe 14 shears the shear pin 13 to move upwards into the locking tooth ring 12 under the action of counterforce, and the shear pin is locked by the locking tooth 122 in the locking tooth ring and cannot move downwards, so that the sucker rod falling into the well is fished.
The locking teeth 122 in the locking teeth ring of the inner circle of the locking teeth ring 12 are reverse locking teeth, and the spiral tooth-shaped conical surface 121 on the outer surface of the locking teeth ring 12 is a reverse locking spiral tooth-shaped inclined surface or more than two reverse locking spiral tooth-shaped inclined surfaces. The spiral tooth-shaped conical surface 121 is matched with the spiral tooth-shaped inner conical surface 151 in the overshot 15, when the locking tooth ring 12 is stressed downwards, the spiral tooth-shaped conical surface 121 is retracted under the action of the spiral tooth-shaped inner conical surface 151 matched with the spiral tooth-shaped conical surface 121, the diameter of the locking tooth ring 12 is forced to be reduced, and the locking tube 14 in the locking tooth ring is locked.
The excircle of the locking tube 14 is a non-isometric excircle, the excircle of the upper part is smaller than the excircle of the middle part, the excircle of the upper part is provided with an upper buckling tool connecting structure, the excircle of the middle part is smaller than the excircle of the lower part and is provided with locking teeth matched with the locking teeth 122 in the locking tooth ring, the excircle of the lower part is provided with threads which can be connected with a locking claw nut 17, and the excircle of the lower part is provided with a hanging step which can hang a locking claw 16; the lower interior cavity of the lock tube 14 is a flared impingement cavity 18.
An upper portion inner chamber of an overshot 15 is equipped with the screw thread and is connected with top connection 11, and an overshot 15's middle part body is equipped with the shear pin hole and penetrates shear pin 13 be equipped with lock claw nut cooperation chamber, can cooperate with lock claw nut 17's outer wall and be equipped with the reverse locking tooth of reverse locking tooth matched with 16 lower part excircles of lock claw below this lock claw nut cooperation chamber in an overshot 15 inner chamber of shear pin 13 below.
The locking claw 16 is provided with a locking claw body 161 and a claw body 162, and the locking claw body 161 can be hung on a hanging step on the outer circle of the lower part of the locking pipe 14 and can rotate around the locking pipe 14; the outer circle of the lower portion of the locking claw body 161 is provided with reverse locking teeth, the claw body 162 is arranged on the lower portion of the locking claw body 161, the inner wall of the lower end of the claw body 162 is further provided with an inner claw 163, and an included angle alpha between an upper inclined plane of a claw projection of the inner claw 163 and an axis is an acute angle smaller than 90 degrees.
The inner cavity of the upper joint 11 is provided with internal threads which can be connected with a connecting pipe 51 and can be connected with a fishing rod through the connecting pipe 51, and a liquid drainage channel 511 is arranged in the pipe body of the connecting pipe 51; internal threads and external threads are respectively arranged at two ends of a pipe body of the connecting pipe 51, the connecting pipes 51 can be in threaded connection with each other, and the length or the number of the connecting pipes can be determined according to the distance from the broken part of the well-falling sucker rod to the reducing shoulder of the sucker rod.
The liquid drainage channels 511 connected in the connecting pipes 51 above the two methods are through grooves staggered in the pipe body of the connecting pipe 51, the connecting pipe 51 can be used as a connecting rod string, and liquid in a fishing rod string can be rapidly discharged through the through grooves, so that convenience is provided for rapidly and downwards punching and fishing the broken sucker rod string in the grabbing well for the fishing rod string. In order to show the structure of the connection pipe 51, the upper portion of the connection pipe 51 is cut and sectioned in fig. 3.
Referring to fig. 2, 3, 5 and 6, the outer surface of the locking ring 12 is configured with a spiral thread type taper surface 121, the inner surface of the locking ring 12 is configured with reverse locking teeth 122 inside the locking ring, the upper end of the locking tube 14 is configured with reverse locking teeth corresponding to the reverse locking teeth 122 inside the locking ring, the lower end of the locking tube 14 is configured with the impact cavity 18, the locking claw body 161 is configured with a claw body 162 and an inner claw 163, and the outer surface of the claw body 162 is configured with reverse locking teeth. The locking tooth ring 12 is screwed and assembled on a corresponding spiral tooth type inner conical surface 151 at the middle upper part of the overshot 15 through a spiral tooth type conical surface 121 on the outer surface of the locking tooth ring, the locking claw 16 is sleeved at the bottom of the locking pipe 14 and is axially fixed at the lower part of the locking pipe 14 through a locking claw nut 17, the locking claw 16 can rotate around the locking pipe 14, and the locking claw 16 and the locking pipe 14 are connected in the overshot 15 through a shear pin 13.
When the fishing rod column is close to a broken sucker rod in a well during fishing, the fishing rod column is freely released, when the tool is flushed to the broken sucker rod reducing shoulder along with the fishing rod column, the reducing conical surface of the sucker rod shoulder expands the locking claw 16, the sucker rod reducing shoulder enters the claw body 162 and pushes the impact cavity 18 at the lower end of the locking pipe 14 to enable the locking pipe 14 to go upwards and cut off the shear pin 13, the locking pipe 14 continues to go upwards and enter the locking tooth ring 12 at the upper part, and at the moment, the locking claw 16 and the sucker rod reducing shoulder completely enter the fishing barrel 15.
Then, the fishing rod column is lifted up to drive the fishing tool to move upwards, the locking pipe 14 relatively moves downwards to drive the locking tooth ring 12 to move downwards, and at the moment, the locking tooth ring 12 is retracted inwards under the action of the spiral tooth-shaped conical surface 121 on the outer surface of the locking tooth ring and the spiral tooth-shaped inner conical surface 151 in the fishing barrel 15, so that the locking pipe 14 is firmly locked in the fishing barrel 15. At this time, the shoulder part of the reducing diameter of the sucker rod moves downwards relatively, the claw body 162 is pushed to the inner wall of the overshot 15 under the action of the inner claw 163 at the lower end of the locking claw 16, and the locking claw 16 is firmly locked in the overshot 15 due to the action of the reverse locking tooth on the outer surface of the locking claw 16 and the reverse locking tooth on the inner wall of the lower part of the overshot 15 corresponding to the locking claw. Because the inner wall of the fishing barrel 15 is restrained, the diameter of the bottom of the locking claw 16 is smaller than the diameter of the reducing shoulder of the sucker rod, the fishing tool drives the broken end of the reducing shoulder of the sucker rod to go upwards, and the construction operation of pulling out the sucker rod string falling into the well is completed.
The embodiments described above are merely exemplary embodiments, but the present invention is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and teaching of the present invention. Many variations, combinations, and modifications of the aspects disclosed herein are possible and are within the scope of the invention, which is, therefore, not to be limited by the above description.
Claims (12)
1. The utility model provides a fishing tool of reducing shoulder fracture sucker rod, includes top connection (11), overshot (15) and locking claw (16), and overshot (15) are connected characterized by with top connection (11):
the inner circle and the outer circle of the locking tooth ring (12) are respectively provided with a locking tooth (122) in the locking tooth ring and a spiral tooth type conical surface (121);
the outer circle of the upper part of the lock tube (14) is provided with locking teeth matched with the locking teeth (122) in the locking tooth ring, and the lower part of the lock tube is in threaded connection with the lock claw (16);
reverse locking teeth are arranged on the outer surface of a claw body (162) of the locking claw (16) and can be matched with the reverse locking teeth on the inner circle of the lower part of the overshot (15);
the locking claw (16) is in threaded connection with the locking pipe (14) and then fixed in the overshot (15) through a shear pin (13), the locking tooth ring (12) is installed between the upper connector (11) and the locking pipe (14), and the spiral tooth-shaped conical surface (121) of the locking tooth ring (12) can be connected with the spiral tooth-shaped inner conical surface (151) of the inner circle of the upper portion of the overshot (15).
2. The fishing tool for the sucker rod with the fracture reducing shoulder as claimed in claim 1, wherein the locking teeth (122) in the locking teeth ring (12) with the inner circle are reverse locking teeth, and the spiral tooth-shaped conical surface (121) on the outer surface of the locking teeth ring (12) is a reverse locking spiral tooth-shaped inclined surface or more than two reverse locking spiral tooth-shaped inclined surfaces.
3. The fishing tool for the sucker rod with the fracture reducing shoulder as claimed in claim 1, wherein the outer circle of the locking pipe (14) is an unequal-diameter outer circle, the upper outer circle is smaller than the middle outer circle, the upper outer circle is provided with a fastening tool connecting structure, the middle outer diameter is smaller than the lower outer diameter and is provided with locking teeth matched with the locking teeth (122) in the locking teeth ring, the lower outer circle is provided with a limiting step, and the lower inner circle is provided with threads to be connected with the locking claws (16).
4. The fishing tool for the sucker rod with the fracture reducing shoulder as claimed in claim 1, wherein the inner cavity of the upper portion of the fishing barrel (15) is provided with threads to be connected with the upper connector (11), the middle body of the fishing barrel (15) is provided with a shear pin hole to penetrate through the shear pin (13), a limit step is arranged in the inner cavity of the fishing barrel (15) below the shear pin (13) to be matched with the limit step of the outer circle of the lower portion of the lock pipe (14), the inner cavity of the lower portion of the fishing barrel (15) is provided with a lock claw body matching cavity, and reverse lock teeth matched with the reverse lock teeth on the outer surface of the claw body (162) are arranged in the inner cavity below the lock claw body matching cavity.
5. The fishing tool for the sucker rod with the variable diameter shoulder fracture as claimed in claim 1, wherein the locking claw (16) is provided with a locking claw body (161), an impact cavity (18) and a claw body (162), and a small diameter section at the upper part of the locking claw body (161) is provided with threads to be connected with the locking pipe (14); the conical section of the excircle of the middle part of the locking claw body (161) is matched with the locking claw body matching cavity of the overshot (15), reverse locking teeth are arranged on the excircle of the lower part of the locking claw body (161) and the outer surface of the claw body (162), and the inner cavity of the locking claw body (161) is a horn-shaped impact cavity (18); the claw body (162) is arranged below an impact cavity (18) of the claw locking body (161), an inner claw (163) is further arranged on the inner wall of the lower end of the claw body (162), and an included angle alpha between an upper inclined plane of a claw projection of the inner claw (163) and an axis is an acute angle smaller than 90 degrees.
6. The fishing tool for the sucker rod with the broken reducing shoulder as claimed in claim 5, wherein the inner cavity of the upper joint (11) is provided with internal threads which can be connected with the connecting pipe (51) and can be connected with the fishing rod column through the connecting pipe (51), and a liquid drainage channel (511) is arranged in the pipe body of the connecting pipe (51); internal threads and external threads are respectively arranged at two ends of a pipe body of the connecting pipe (51), the connecting pipes (51) can be in threaded connection with each other, and the length or the number of the connecting pipes can be determined according to the distance from the broken part of the well-falling sucker rod to the reducing shoulder of the sucker rod.
7. The utility model provides a fishing tool of reducing shoulder fracture sucker rod, includes top connection (11), overshot (15) and locking claw (16), and overshot (15) are connected characterized by with top connection (11):
the inner circle and the outer circle of the locking tooth ring (12) are respectively provided with a locking tooth (122) in the locking tooth ring and a spiral tooth type conical surface (121);
the middle pipe body of the lock pipe (14) is provided with locking teeth matched with the locking teeth (122) in the locking tooth ring, and the lower pipe body is provided with a lock claw nut (17) and can suspend a lock claw (16);
the outer circle of the lower part of the locking claw (16) is provided with reverse locking teeth which can be matched with the reverse locking teeth of the inner circle of the lower part of the overshot (15);
the locking claw (16) is hung on the outer circle of the lower portion of the locking pipe (14), the locking claw nut (17) is installed in the fishing barrel (15) through the shear pin (13), the locking tooth ring (12) is installed between the upper connector (11) and the locking pipe (14), and the spiral tooth-shaped conical surface (121) of the locking tooth ring (12) can be connected with the spiral tooth-shaped inner conical surface (151) of the inner circle of the upper portion of the fishing barrel (15).
8. The fishing tool for the sucker rod with the fracture reducing shoulder as claimed in claim 7, wherein the locking teeth (122) in the locking teeth ring (12) with the inner circle are reverse locking teeth, and the spiral tooth-shaped conical surface (121) on the outer surface of the locking teeth ring (12) is a reverse locking spiral tooth-shaped inclined surface or more than two reverse locking spiral tooth-shaped inclined surfaces.
9. The fishing tool for the sucker rod with the fracture reducing shoulder as claimed in claim 7, wherein the outer circle of the locking pipe (14) is a non-constant diameter outer circle, the upper outer circle is smaller than the middle outer circle, the upper outer circle is provided with a fastening tool connecting structure, the middle outer circle is smaller than the lower outer circle and is provided with locking teeth matched with the locking teeth (122) in the locking teeth ring, the lower outer circle is provided with threads capable of being connected with a locking claw nut (17), the lower outer circle is provided with a hanging step capable of hanging a locking claw (16); the lower inner cavity of the lock tube (14) is a flared impact cavity (18).
10. The fishing tool for the sucker rod with the fracture reducing shoulder as claimed in claim 7, wherein the inner cavity of the upper portion of the fishing barrel (15) is provided with threads to be connected with the upper connector (11), the middle body of the fishing barrel (15) is provided with a shear pin hole to penetrate through the shear pin (13), a locking claw nut matching cavity is arranged in the inner cavity of the fishing barrel (15) below the shear pin (13) and can be matched with the outer wall of the locking claw nut (17), and reverse locking teeth matched with the reverse locking teeth on the outer circle of the lower portion of the locking claw (16) are arranged below the locking claw nut matching cavity.
11. The fishing tool for the sucker rod with the variable diameter shoulder fracture as claimed in claim 7, wherein the locking claw (16) is provided with a locking claw body (161) and a claw body (162), the locking claw body (161) can be hung on a hanging step on the outer circle of the lower part of the locking pipe (14) and can rotate around the locking pipe (14); the lower part excircle of lock claw body (161) is equipped with reverse locking tooth, establish the lower part at lock claw body (161) claw body (162) the lower extreme inner wall of claw body (162) still is equipped with interior jack catch (163), and the protruding inclined plane of claw of this interior jack catch (163) is gone up the contained angle alpha between the axis and is less than 90 degrees acute angle.
12. The fishing tool for the sucker rod with the broken reducing shoulder as claimed in claim 7, wherein the inner cavity of the upper joint (11) is provided with internal threads which can be connected with a connecting pipe (51) and can be connected with a fishing rod column through the connecting pipe (51), and a liquid drainage channel (511) is arranged in the pipe body of the connecting pipe (51); internal threads and external threads are respectively arranged at two ends of a pipe body of the connecting pipe (51), the connecting pipes (51) can be in threaded connection with each other, and the connection length or the connection number can be determined according to the distance from the broken part of the well-falling sucker rod to the reducing shoulder of the sucker rod.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011166764.XA CN114482898B (en) | 2020-10-27 | 2020-10-27 | Fishing tool for reducing shoulder fracture sucker rod |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011166764.XA CN114482898B (en) | 2020-10-27 | 2020-10-27 | Fishing tool for reducing shoulder fracture sucker rod |
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| CN114482898A true CN114482898A (en) | 2022-05-13 |
| CN114482898B CN114482898B (en) | 2024-03-22 |
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| CN114482898B (en) | 2024-03-22 |
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