CN114482898B - Fishing tool for reducing shoulder fracture sucker rod - Google Patents
Fishing tool for reducing shoulder fracture sucker rod Download PDFInfo
- Publication number
- CN114482898B CN114482898B CN202011166764.XA CN202011166764A CN114482898B CN 114482898 B CN114482898 B CN 114482898B CN 202011166764 A CN202011166764 A CN 202011166764A CN 114482898 B CN114482898 B CN 114482898B
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- locking
- claw
- overshot
- tooth
- pipe
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- 208000002103 Shoulder Fractures Diseases 0.000 title claims abstract description 10
- 208000031294 Upper limb fractures Diseases 0.000 title claims abstract description 10
- 210000000078 claw Anatomy 0.000 claims abstract description 179
- 230000002441 reversible effect Effects 0.000 claims abstract description 63
- 208000010392 Bone Fractures Diseases 0.000 claims abstract description 11
- 206010017076 Fracture Diseases 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims description 14
- 230000001154 acute effect Effects 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 239000011324 bead Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 230000009471 action Effects 0.000 description 13
- 230000007246 mechanism Effects 0.000 description 4
- 210000003205 muscle Anatomy 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007599 discharging 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
- 238000003801 milling Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Marine Sciences & Fisheries (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Fishing Rods (AREA)
Abstract
The invention relates to a fishing tool for a variable-diameter shoulder fracture sucker rod, which comprises an upper joint, an overshot and a locking claw, wherein the overshot is connected with the upper joint, and the inner circle and the outer circle of a locking tooth ring are respectively provided with locking teeth and spiral tooth conical surfaces in the locking tooth ring; the outer surface of the claw body of the locking claw is provided with a reverse locking tooth which can be matched with the reverse locking tooth of the inner circle of the lower part of the overshot; the locking claw is fixed in the overshot through the shear pin after being in threaded connection with the locking pipe, the locking tooth ring is arranged between the upper joint and the locking pipe, and the spiral tooth type conical surface of the locking tooth ring can be connected with the spiral tooth type inner conical surface of the inner circle of the upper part of the overshot. The invention can be used for salvaging the sucker rod string which falls into the production oil pipe after the fracture at the reducing shoulder, has reliable and stable working performance, can reliably complete the whole process of entering and firmly locking the falling sucker rod shoulder by one-time downward impact, and well solves the technical problem that the fracture at the reducing shoulder of the sucker rod falls into the production oil pipe for salvaging at present. The salvaging construction efficiency can be effectively improved.
Description
Technical Field
The invention relates to a fishing device for a sucker rod string in an underground production oil pipe in the petroleum industry, in particular to a fishing tool for a variable-diameter shoulder fracture sucker rod.
Background
With the wide use of lining oil pipes, the problem of well stopping caused by broken and separated sucker rods in the oil pipes becomes more remarkable, and with the increase of small casing wells, the 'broken and separated sucker rods' and 'salvaged sucker rods' in lining pipes with reduced sucker rod salvaging channels and small oil pipes are the problems which are urgent to be studied and solved in the aspect of controlling lying wells at present, and particularly, the broken salvaging operation at the reducing shoulders of the ends of the sucker rods in the lining oil pipes and the small oil pipes is particularly difficult.
At present, few broken sucker rod salvaging tools are used for salvaging the variable diameter shoulder of the sucker rod in a small salvaging channel such as a lining, and the following types of the broken sucker rod salvaging tools are searched:
1. the application number is: CN201220555155.8, patent name: the invention relates to a sucker rod fisher for lining an oil pipe, which comprises a fisher joint, a fisher barrel, a spring, a lock sleeve and a constraint ring, wherein the upper part of the fisher joint is provided with sucker rod threads, the lower part of the fisher barrel is provided with a plurality of grooves in a milling way, the lower parts of the grooves are communicated with each other to form a strip body between the grooves of the fisher barrel, the lower part of the fisher joint is connected with the upper part of the fisher barrel, the spring and the lock sleeve are sleeved outside the fisher barrel, the lower end surface of the fisher 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, the inner shoulder of the lock sleeve is arranged on the outer shoulder of the lower part of the fisher barrel, the inner wall below the inner shoulder of the lock sleeve wraps the lower part of the fisher barrel, and the constraint ring is arranged in the expanding cavity. The lock sleeve of the oil pipe is also possibly blocked by the inner wall of the oil pipe after the reducing shoulder of the oil pumping rod enters the expanding cavity to be unable to move downwards, thus being unable to be reliably locked, and further causing the failure of salvaging, thus the salvaging device has unreliability.
2. The application number is: CN201520145784.7, patent name: the utility model provides a sucker rod fisher, including salvaging joint, the connecting pin, the lock sleeve, evenly mill and open several slot on salvaging the joint, the other part is the body, it is the spout to open on the body of the part of salvaging joint, it has several blank groove to open on the lock sleeve, the quantity of blank groove is the same with the quantity of the body, the position remainder that the blank groove was opened to the lock sleeve is erects the muscle, the width of blank groove is greater than the width of the body, erects the width of muscle and is less than the width of slot, salvage joint and lock sleeve peg graft together, make erectly the muscle get into the slot, the body gets into in the blank groove, the connecting pin gets into the screw of fixing in lock sleeve upper portion from the spout in, the pin can slide from top to bottom in the spout, salvage joint and lock sleeve peg graft together, each department is the individual layer, therefore the external diameter can reduce, but the bottom toper of the blank groove of its lock sleeve is unable to process, salvage the inboard of the body of joint has shoulder and lock tooth, even can not grasp the sucker rod, but can not be salvaged because of bearing load.
3. The invention has the following application number: CN201520795133.2, patent name: the invention relates to a sucker rod fisher for an oilfield 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 reduces the inside of the claw-shaped fishing barrel 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 the hanging rod, the upper part of the hanging rod is connected with an upper joint, a lock sleeve is sleeved outside the claw-shaped fishing barrel, and a pin temporarily connects the lock sleeve with the claw-shaped fishing barrel. The device relies on the spacing nail mechanism to restrict the sucker rod to upwards move, but spacing nail mechanism position is fixed, and the distance of sucker rod fracture position from the shoulder position, in different oil wells, so it is difficult to adapt to the salvage of actual fracture shoulder in the pit, and its outer lock sleeve can reciprocate after the lock sleeve locking nail is cut, is not locked reliably, exists unreliability in the process of extracting the sucker rod string.
Further improvements are needed for fishing tools for a broken sucker rod string at a downhole reducing shoulder.
Disclosure of Invention
The invention aims to provide a fishing tool for a variable-diameter shoulder fracture sucker rod, which is used for fishing a downhole sucker rod string fractured from the variable-diameter shoulder and solves the problem that the existing fishing tool cannot reliably salvage the downhole fracture sucker rod string. The reliability of the salvage operation is ensured, the salvage efficiency and the salvage success rate are improved, and the operation cost is reduced.
The technical scheme 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, and the overshot is connected with the top connection, wherein:
the inner circle and the outer circle of the locking tooth ring are respectively provided with locking teeth and spiral tooth type conical surfaces in the locking tooth ring;
the outer circle of the upper part of the locking pipe is provided with a locking tooth matched with the locking tooth in the locking tooth ring, and the lower part of the locking pipe is in threaded connection with the locking claw;
the outer surface of the claw body of the locking claw is provided with a reverse locking tooth which can be matched with the reverse locking tooth of the inner circle of the lower part of the overshot;
the locking claw is fixed in the overshot through the shear pin after being in threaded connection with the locking pipe, the locking tooth ring is arranged between the upper joint and the locking pipe, and the spiral tooth type conical surface of the locking tooth ring can be connected with the spiral tooth type inner conical surface of the inner circle of the upper part of the overshot.
The locking teeth in the locking teeth ring of the inner circle of the locking teeth ring are reverse locking teeth, and the spiral tooth type conical surface of the outer surface of the locking teeth ring is a reverse locking spiral tooth type inclined surface or more than two reverse locking spiral tooth type inclined surfaces.
The outer circle of the locking pipe is a non-constant diameter outer circle, the upper outer circle is smaller than the middle outer circle and is provided with a buckling tool connecting structure, the middle outer diameter is smaller than the lower outer diameter and is provided with locking teeth matched with locking teeth in the locking teeth ring, the lower outer circle is provided with a limiting step, and the lower inner circle is provided with threads and is connected with the locking claws.
The upper inner cavity of the overshot is provided with threads and is connected with an upper joint, the middle body of the overshot is provided with a shear pin hole for penetrating a shear pin, a limiting step is arranged in the inner cavity of the overshot below the shear pin and is matched with the limiting step of the outer circle of the lower part of the lock tube, the lower inner cavity of the overshot is provided with a locking claw body matching cavity, and a reverse locking tooth matched with a reverse locking tooth on the outer surface of the claw body is arranged in the inner cavity below the locking claw body matching cavity.
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 is connected with a locking pipe; the conical section of the outer circle of the middle part of the locking claw body is matched with the locking claw body matching cavity of the overshot, the outer circle of the lower part of the locking claw body and the outer surface of the claw body are both provided with reverse locking teeth, 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, the inner wall of the lower end of the claw body is also provided with an inner claw, and an included angle alpha between the claw convex upper inclined surface of the inner claw and the axis is an acute angle smaller than 90 degrees.
The inner cavity of the upper joint is provided with an internal thread which can be connected with the connecting pipe and can be connected with the fishing rod column through the connecting pipe, and a liquid discharge channel is arranged in the pipe body of the connecting pipe; the two ends of the pipe body of the connecting pipe are respectively provided with an internal thread and an external thread, the connecting pipes can be connected with each other through threads, and the length or the connection number of the connection can be determined according to the distance from the breaking part of the well-falling sucker rod to the reducing shoulder of the sucker rod.
The utility model provides a fishing tool of reducing circular bead fracture sucker rod includes top connection, overshot and locking claw, and the overshot is connected with the top connection, wherein:
the inner circle and the outer circle of the locking tooth ring are respectively provided with locking teeth and spiral tooth type conical surfaces in the locking tooth ring;
the middle pipe body of the locking pipe is provided with a locking tooth matched with the locking tooth in the locking tooth ring, and the lower pipe body is provided with a locking claw nut and can suspend the locking claw;
the outer circle of the lower part of the locking claw is provided with a reverse locking tooth which can be matched with the reverse locking tooth of the inner circle of the lower part of the overshot;
the lower outer circle of the lock tube is suspended with padlock claws, a lock claw nut is arranged in the overshot through a shear pin, a lock tooth ring is arranged between the upper connector and the lock tube, and a spiral tooth type conical surface of the lock tooth ring can be connected with a spiral tooth type inner conical surface of the inner circle of the upper part of the overshot.
The locking teeth in the locking teeth ring of the inner circle of the locking teeth ring are reverse locking teeth, and the spiral tooth type conical surface of the outer surface of the locking teeth ring is a reverse locking spiral tooth type inclined surface or more than two reverse locking spiral tooth type inclined surfaces.
The outer circle of the locking pipe 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 buckling tool connecting structure, the middle outer circle is smaller than the lower outer circle and is provided with locking teeth matched with locking teeth in the locking teeth 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 the locking claw; the lower inner cavity of the lock tube is a horn-shaped impact cavity.
The upper inner cavity of the overshot is provided with threads and is connected with an upper joint, the middle body of the overshot is provided with a shear pin hole for penetrating a shear pin, a locking claw nut matching cavity is arranged in the inner cavity of the overshot below the shear pin and can be matched with the outer wall of the locking claw nut, and a reverse locking tooth matched with a reverse locking tooth of the excircle of the lower part of the locking claw is arranged below the locking claw nut matching cavity.
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 of the outer circle of the lower part of the locking pipe and can rotate around the locking pipe; the lower outer circle of the locking claw body is provided with a reverse locking tooth, the claw body is arranged at the lower part of the locking claw body, the inner wall of the lower end of the claw body is also provided with an inner claw, and an included angle alpha between the claw convex upper inclined surface of the inner claw and the axis is an acute angle smaller than 90 degrees.
The inner cavity of the upper joint is provided with an internal thread which can be connected with the connecting pipe and can be connected with the fishing rod column through the connecting pipe, and a liquid discharge channel is arranged in the pipe body of the connecting pipe; the two ends of the pipe body of the connecting pipe are respectively provided with an internal thread and an external thread, the connecting pipes can be connected with each other through threads, and the length or the connection number of the connection can be determined according to the distance from the breaking part of the well-falling sucker rod to the reducing shoulder of the sucker rod.
The invention has the remarkable use effects that:
the invention provides a fishing tool for a variable-diameter shoulder fracture sucker rod with two structures, wherein 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 both structures can be connected with the salvaging pipe column through the connecting pipe with the liquid discharging channel. After the connecting pipe is connected between the salvaging pipe column and the invention, the liquid in the salvaging pipe column can be discharged at any time, thereby creating more favorable working conditions for the downward impact salvaging well-falling sucker rod.
When the fishing pipe column is carried by the invention near the reducing shoulder of the sucker rod of the well, the fishing tool is released freely, namely when the fishing tool is near the top of the broken rod and is separated from a certain free falling accelerating distance, the ground does not need to control the descending speed by a brake, so that the fishing pipe column is accelerated to fall under the action of self gravity, the broken sucker rod enters the fishing tool of the invention under the driving of the downward impact force of the fishing pipe column, and the liquid stored in the inner cavity of the fishing tool is discharged from the liquid discharge channel of the connecting pipe rapidly. The salvaging tool impacts downwards, huge impact force acts on the broken variable-diameter shoulder of the sucker rod, the locking claw is expanded by the variable-diameter shoulder and enters the locking claw sequentially, the variable-diameter shoulder of the broken rod pushes the impact cavity to upwards shear the shear pin, the locking pipe upwards enters the upper locking tooth ring, the locking claw and the variable-diameter shoulder completely enter the salvaging cylinder body, and the locking pipe is locked and cannot downwards after being meshed with the reverse locking tooth in the salvaging cylinder. And then lifting the fishing rod column and driving the fishing tool and the sucker rod column of the well to move upwards, wherein the diameter-variable shoulder part of the sucker rod moves downwards relatively at the moment, and the locking claw is pushed to the inner wall of the overshot under the action of the claw convex inclined plane of the inner clamping claw of the locking claw. The locking claw is firmly locked in the inner wall of the overshot due to the action of the locking claw and the reverse locking tooth of the inner wall of the overshot. Because the restraint of the inner wall of the overshot and the caliber formed by the claw body at the bottom of the locking claw are smaller than the diameter of the diameter-variable shoulder of the sucker rod, the fishing tool drives the broken end of the shoulder of the sucker rod to finish the construction work of lifting the sucker rod string falling down the well.
The invention can be used for salvaging the sucker rod string which falls into the production oil pipe after the fracture at the reducing shoulder, the working performance is reliable and stable, and the whole process of entering and firmly locking the well-falling sucker rod shoulder can be reliably completed 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, reduce liquid resistance, ensure that the fishing is more reliable and stable, and well solve the technical problem that the fracture at the reducing shoulder of the sucker rod falls into the production oil pipe for fishing at present. The salvaging construction efficiency can be effectively improved, the operation cost is reduced, and the economic benefit is remarkably improved.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
fig. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a schematic view of another embodiment of the present invention.
Fig. 3 is a schematic view of the construction of the tooth ring of fig. 1 and 2.
Fig. 4 is a schematic view of the latch of fig. 1.
Fig. 5 is a schematic view of the latch of fig. 2.
Fig. 6 is a schematic structural view of the connection pipe.
Fig. 7 is an enlarged view of a portion of the inner tapered surfaces of the locking collar and the screw flight of the overshot of fig. 1.
Fig. 8 is an enlarged partial schematic view of the reverse locking tooth of the overshot of fig. 1.
Annotation: fig. 6 is a cut-away view of the upper portion of the connecting tube body in order to better show the structure of the connecting tube.
Detailed Description
The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present invention. The technical solutions 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 will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the description of the present invention, it should 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 orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, in the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1, 3, 4, 6, 7 and 8, a fishing tool for reducing shoulder fracturing sucker rods comprises an upper joint 11, an overshot 15 and a locking claw 16, wherein the overshot 15 is connected with the upper joint 11, wherein:
the inner circle and the outer circle of the lock tooth ring 12 are respectively provided with a lock tooth 122 in the lock tooth ring and a spiral tooth conical surface 121;
the outer circle of the upper part of the lock tube 14 is provided with a locking tooth matched with the locking tooth 122 in the locking tooth ring, and the lower part of the lock tube is in threaded connection with the locking claw 16;
the outer surface of the claw body 162 of the locking claw 16 is provided with reverse locking teeth and 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 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 arranged between the upper joint 11 and the locking tube 14, and the spiral tooth type conical surface 121 of the locking tooth ring 12 can be connected with the spiral tooth type inner conical surface 151 of the inner circle of the upper part of the overshot 15. After the sucker rod broken by the diameter-variable shoulder is clamped into the locking claw 16 by downward impact of the fishing pipe column, the locking pipe 14 shears the shear pin 13 to move upwards to the inside of the locking tooth ring 12 under the action of the counter force, and the locking tooth 122 in the locking tooth ring is locked 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 overshot 15, and when the locking teeth ring 12 is stressed downwards, the spiral tooth-shaped conical surface 121 is retracted under the action of the matched spiral tooth-shaped inner conical surface 151, so that the diameter of the locking teeth ring 12 is forced to be reduced, and the locking tube 14 inside the locking teeth ring is locked.
The outer circle of the locking tube 14 is a non-equal diameter outer circle, the upper outer circle is smaller than the middle outer circle and is provided with a buckling 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 and is connected with the locking claws 16.
The upper inner cavity of the overshot 15 is provided with threads and is connected with the upper joint 11, the middle body of the overshot 15 is provided with a shear pin hole penetrating into the shear pin 13, a limiting step matched with a limiting step of the outer circle of the lower part of the lock tube 14 is arranged in the inner cavity of the overshot 15 below the shear pin 13, the lower inner cavity of the overshot 15 is provided with a locking claw body matching cavity, and a reverse locking tooth matched with a reverse locking tooth of the outer surface of the claw body 162 is arranged in the inner cavity below the locking claw body matching cavity.
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 and is connected with the locking pipe 14; the conical section of the middle outer circle of the locking claw body 161 is matched with the locking claw body matching cavity of the overshot 15, the lower outer circle of the locking claw body 161 and the outer surface of the claw body 162 are both provided with reverse locking teeth, and the inner cavity of the locking claw body 161 is a horn-shaped impact cavity 18; the pawl 162 is disposed below the impact cavity 18 of the pawl body 161, and an inner pawl 163 is further disposed on the inner wall of the lower end of the pawl 162, and an included angle α between the upper inclined surface of the pawl protrusion of the inner pawl 163 and the axis is an acute angle smaller than 90 degrees.
An inner cavity of the upper joint 11 is provided with an internal thread which can be connected with a connecting pipe 51 and can be connected with a salvage pole through the connecting pipe 51, and a liquid discharge channel 511 is arranged in a pipe body of the connecting pipe 51; the two ends of the pipe body of the connecting pipe 51 are respectively provided with an internal thread and an external thread, the connecting pipes 51 can be connected with each other by threads, and the length or the connection number of the connection can be determined according to the distance from the breaking 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 pole approaches to the broken sucker rod in the well during fishing, the fishing rod pole is released freely, when the invention is flushed to the broken sucker rod diameter-changing shoulder along with the fishing rod pole, the diameter-changing conical surface of the sucker rod shoulder expands the locking claw 16, the sucker rod diameter-changing shoulder enters the locking claw 16, the broken rod diameter-changing shoulder pushes the impact cavity 18 and the locking pipe 14 to upward shear the shear pin 13, the locking pipe 14 continues to upward enter the upper locking tooth ring 12, and at the moment, the locking claw 16 and the sucker rod diameter-changing shoulder completely enter the overshot 15.
Thereafter, the fishing rod is lifted up to drive the fishing tool to move upwards, the lock tube 14 relatively moves downwards to drive the lock tooth ring 12 to move downwards, and at the moment, the lock tooth ring 12 is retracted under the action of the spiral tooth conical surface 121 on the outer surface of the lock tooth ring and the spiral tooth inner conical surface 151 in the overshot 15, so that the lock tube 14 is firmly locked in the overshot 15. At this time, the diameter-variable shoulder part of the well-falling sucker rod moves relatively downwards, the locking claw 16 is pushed to the inner wall of the overshot 15 under the action of the clamping claw 163 in 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 teeth on the outer surface of the claw body 162 in the lower part of the locking claw body 161 and the reverse locking teeth on the inner wall of the lower part of the overshot 15 corresponding to the reverse locking teeth. Because of the constraint of the inner wall of the overshot 15, the caliber of the bottom of the locking claw 16 is smaller than the diameter of the diameter-variable shoulder of the well-falling sucker rod, and the salvaging tool drives the broken end of the well-falling sucker rod shoulder to move upwards, so that the construction operation of lifting out the well-falling sucker rod string is completed.
Described below is the invention of another construction:
referring to fig. 2, 3, 5 and 6, a fishing tool for reducing shoulder breaking sucker rods comprises an upper joint 11, an overshot 15 and a locking claw 16, the overshot 15 being connected to the upper joint 11, wherein:
the inner circle and the outer circle of the lock tooth ring 12 are respectively provided with a lock tooth 122 in the lock tooth ring and a spiral tooth conical surface 121;
the middle tube body of the locking tube 14 is provided with locking teeth matched with the locking teeth 122 in the locking teeth ring, and the lower tube body is provided with a locking claw nut 17 and can suspend the locking 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 lower outer circle of the lock tube 14 is suspended with a padlock claw 16, a lock claw nut 17 is arranged in the overshot 15 through a shear pin 13, a lock tooth ring 12 is arranged between the upper joint 11 and the lock tube 14, and a spiral tooth conical surface 121 of the lock tooth ring 12 can be connected with a spiral tooth inner conical surface 151 of the upper inner circle of the overshot 15. After the sucker rod broken by the diameter-variable shoulder is clamped into the locking claw 16 by downward impact of the fishing pipe column, the locking pipe 14 shears the shear pin 13 to move upwards to the inside of the locking tooth ring 12 under the action of the counter force, and the locking tooth 122 in the locking tooth ring is locked 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 lock tooth ring 12 is stressed downwards, the spiral tooth-shaped conical surface 121 is retracted under the action of the matched spiral tooth-shaped inner conical surface 151, and the diameter of the lock tooth ring 12 is forced to be reduced, so that the lock tube 14 inside the lock tooth ring is locked.
The outer circle of the locking tube 14 is a non-equal diameter outer circle, the upper outer circle is smaller than the middle outer circle and is provided with a buckling 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 which can be connected with the locking claw nuts 17, and the lower outer circle is provided with a hanging step which can hang the locking claws 16; the lower interior cavity of the lock tube 14 is a flared impingement cavity 18.
The upper inner cavity of the overshot 15 is provided with threads and is connected with the upper joint 11, the middle body of the overshot 15 is provided with a shear pin hole penetrating through the shear pin 13, a locking claw nut matching cavity is arranged in the inner cavity of the overshot 15 below the shear pin 13 and can be matched with the outer wall of the locking claw nut 17, and a reverse locking tooth matched with a reverse locking tooth of the excircle of the lower part of the locking claw 16 is arranged below the locking claw nut matching cavity.
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 of the outer circle of the lower part of the locking pipe 14 and can rotate around the locking pipe 14; the lower outer circle of the locking claw body 161 is provided with a reverse locking tooth, the claw body 162 is arranged at the lower part of the locking claw body 161, the inner wall of the lower end of the claw body 162 is also provided with an inner claw 163, and the included angle alpha between the claw convex upper inclined surface of the inner claw 163 and the axis is an acute angle smaller than 90 degrees.
An inner cavity of the upper joint 11 is provided with an internal thread which can be connected with a connecting pipe 51 and can be connected with a salvage pole through the connecting pipe 51, and a liquid discharge channel 511 is arranged in a pipe body of the connecting pipe 51; the two ends of the pipe body of the connecting pipe 51 are respectively provided with an internal thread and an external thread, the connecting pipes 51 can be connected with each other by threads, and the length or the connection number of the connection can be determined according to the distance from the breaking part of the well-falling sucker rod to the reducing shoulder of the sucker rod.
The liquid discharge channels 511 connected in the connecting pipes 51 above the two invention are through grooves which are arranged in the connecting pipe 51 in a staggered manner, the connecting pipe 51 can be used as a connecting rod column, and liquid in the fishing rod column can be rapidly discharged through the through grooves, so that convenience is provided for the quick undershoot of the fishing rod column, the fishing and the broken sucker rod column in the well. 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 latch ring 12 is configured with a spiral tooth type conical surface 121, the inner surface of the latch ring 12 is configured with a reverse latch ring inner locking tooth 122, the upper end of the latch tube 14 is configured with a reverse locking tooth corresponding to the reverse latch ring inner locking tooth 122, the lower end of the latch tube 14 is configured with an impact cavity 18, the latch body 161 is configured with a claw body 162 and an inner clamping claw 163, and the outer surface of the claw body 162 is provided with the reverse locking tooth. The locking tooth ring 12 is assembled on the corresponding spiral tooth inner conical surface 151 at the upper part of the overshot 15 in a screwing way through the spiral tooth conical surface 121 on the outer surface of the locking tooth ring, the locking claw 16 is sleeved at the bottom of the locking tube 14 and axially fixed at the lower part of the locking tube 14 by the locking claw nut 17, the locking claw 16 can rotate around the locking tube 14, and the locking claw 16 and the locking tube 14 are connected in the overshot 15 through the shear pin 13.
When the fishing rod pole approaches to the broken sucker rod in the well during fishing, the fishing rod pole is released freely, when the tool is flushed to the broken sucker rod diameter-changing shoulder along with the fishing rod pole, the diameter-changing conical surface of the sucker rod shoulder expands the unlocking claw 16, the sucker rod diameter-changing shoulder enters the claw body 162 and pushes the impact cavity 18 at the lower end of the lock pipe 14 to enable the lock pipe 14 to ascend and shear the shear pin 13, the lock pipe 14 continues to ascend into the upper lock tooth ring 12, and at the moment, the locking claw 16 and the sucker rod diameter-changing shoulder completely enter the overshot 15.
Thereafter, the fishing rod is lifted up to drive the fishing tool to move upwards, the lock tube 14 relatively moves downwards to drive the lock tooth ring 12 to move downwards, and at the moment, the lock tooth ring 12 is retracted under the action of the spiral tooth conical surface 121 on the outer surface of the lock tooth ring and the spiral tooth inner conical surface 151 in the overshot 15, so that the lock tube 14 is firmly locked in the overshot 15. At this time, the diameter-variable shoulder part of the sucker rod moves relatively downwards, the claw body 162 is pushed to the inner wall of the overshot 15 under the action of the inner clamping 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 teeth on the outer surface of the locking claw 16 and the reverse locking teeth on the inner wall of the lower part of the overshot 15 corresponding to the reverse locking teeth. Because of the constraint of the inner wall of the overshot 15, the caliber of the bottom of the locking claw 16 is smaller than the diameter of the diameter-variable shoulder of the sucker rod, and the salvaging tool drives the broken end of the diameter-variable shoulder of the sucker rod to move upwards, so that the construction operation of the sucker rod string which is lifted out of the well and falls down is completed.
The embodiments described above are only exemplary embodiments, but the present invention is not limited to these embodiments, and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Many variations, combinations, and modifications of the arrangements disclosed herein are possible and are within the scope of the invention, and therefore, the scope of protection is not limited solely by the description set forth above.
Claims (10)
1. The utility model provides a fishing tool of reducing circular bead fracture sucker rod, includes top connection (11), overshot (15) and locking dog (16), and overshot (15) are connected characterized by with top connection (11): the inner circle and the outer circle of the tooth locking ring (12) are respectively provided with a locking tooth (122) in the tooth locking ring and a spiral tooth conical surface (121); the outer circle of the upper part of the locking pipe (14) is provided with locking teeth matched with the locking teeth (122) in the locking teeth ring, and the lower part of the locking pipe is in threaded connection with the locking claw (16); the outer surface of the claw body (162) of the locking claw (16) is provided with a reverse locking tooth which 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 fixed in the overshot (15) through the shear pin (13) after being in threaded connection with the locking pipe (14), the locking tooth ring (12) is arranged between the upper joint (11) and the locking pipe (14), and the spiral tooth conical surface (121) of the locking tooth ring (12) can be connected with the spiral tooth inner conical surface (151) of the inner circle of the upper part of the overshot (15); the outer circle of the locking tube (14) is a non-equal diameter outer circle, the upper outer circle is smaller than the middle outer circle, a buckling tool connecting structure is arranged on the upper outer circle, the middle outer diameter is smaller than the lower outer diameter, locking teeth matched with the locking teeth (122) in the locking teeth ring are arranged on the middle outer diameter, a limiting step is arranged on the lower outer circle, and threads are arranged on the lower inner circle and are connected with the locking claws (16); the upper inner cavity of the overshot (15) is provided with threads and is connected with the upper joint (11), a limiting step is arranged in the inner cavity of the overshot (15) and is matched with the limiting step of the outer circle of the lower part of the lock tube (14), and the lower inner cavity of the overshot (15) is provided with a locking claw body matching cavity; 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 middle outer circle of the locking claw body (161) is matched with the locking claw body matching cavity of the overshot (15), the lower outer circle of the locking claw body (161) and the outer surface of the claw body (162) are both provided with reverse locking teeth, and the inner cavity of the locking claw body (161) is a horn-shaped impact cavity (18).
2. The fishing tool for the variable diameter shoulder fracture sucker rod according to claim 1, wherein the locking teeth (122) in the locking teeth ring in the inner circle of the locking teeth ring (12) are reverse locking teeth, and the spiral tooth conical surface (121) on the outer surface of the locking teeth ring (12) is a reverse locking spiral tooth inclined surface or more than two reverse locking spiral tooth inclined surfaces.
3. The fishing tool for the variable-diameter shoulder broken sucker rod, as claimed in claim 1, wherein a shear pin hole penetrating through a shear pin (13) is formed in the middle body of the overshot (15), and a limit step in the inner cavity of the overshot (15) is arranged below the shear pin (13); the inner cavity below the locking claw body matching cavity of the overshot (15) is provided with reverse locking teeth matched with the reverse locking teeth on the outer surface of the claw body (162).
4. A fishing tool for a variable diameter shoulder broken sucker rod as claimed in claim 1, wherein the claw body (162) is arranged below the impact cavity (18) of the claw locking body (161), the inner wall of the lower end of the claw body (162) is also provided with an inner claw (163), and the included angle alpha between the claw convex upper inclined surface of the inner claw (163) and the axis is an acute angle smaller than 90 degrees.
5. The fishing tool for the variable-diameter shoulder fracture sucker rod according to claim 4, 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 a fishing rod column through the connecting pipe (51), and a liquid discharge channel (511) is arranged in the pipe body of the connecting pipe (51); the two ends of the pipe body of the connecting pipe (51) are respectively provided with an internal thread and an external thread, the connecting pipes (51) can be connected with each other through threads, and the connection length or 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.
6. The utility model provides a fishing tool of reducing circular bead fracture sucker rod, includes top connection (11), overshot (15) and locking dog (16), and overshot (15) are connected characterized by with top connection (11): the inner circle and the outer circle of the tooth locking ring (12) are respectively provided with a locking tooth (122) in the tooth locking ring and a spiral tooth conical surface (121); the middle pipe body of the locking pipe (14) is provided with a locking tooth matched with the locking tooth (122) in the locking tooth ring, and the lower pipe body is provided with a locking claw nut (17) and can suspend the locking claw (16); the outer circle of the lower part of the locking claw (16) is provided with a reverse locking tooth which can be matched with the reverse locking tooth of the inner circle of the lower part of the overshot (15); the lower outer circle of the lock tube (14) is suspended with a padlock claw (16) and is provided with a lock claw nut (17) and then is arranged in the overshot (15) through a shear pin (13), a lock tooth ring (12) is arranged between the upper joint (11) and the lock tube (14), and a spiral tooth type conical surface (121) of the lock tooth ring (12) can be connected with a spiral tooth type inner conical surface (151) of the inner circle of the upper part of the overshot (15); 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 and is provided with a buckling tool connecting structure, the middle outer circle is smaller than the lower outer circle and is provided with locking teeth matched with locking teeth (122) in the locking teeth ring, the lower outer circle is provided with threads which can be connected with a locking claw nut (17), and the lower outer circle is provided with a hanging step which can hang a locking claw (16); the lower inner cavity of the lock tube (14) is a horn-shaped impact cavity (18); the upper inner cavity of the overshot (15) is provided with threads which are connected with the upper joint (11), and the inner cavity of the overshot (15) is provided with a locking claw nut matching cavity which can be matched with the outer wall of the locking claw nut (17); 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 of the outer circle of the lower part of the locking pipe (14) and can rotate around the locking pipe (14).
7. The fishing tool for the variable diameter shoulder fracture sucker rod according to claim 6, wherein the locking teeth (122) in the locking teeth ring in the inner circle of the locking teeth ring (12) are reverse locking teeth, and the spiral tooth conical surface (121) on the outer surface of the locking teeth ring (12) is a reverse locking spiral tooth inclined surface or more than two reverse locking spiral tooth inclined surfaces.
8. The fishing tool for the variable-diameter shoulder broken sucker rod according to claim 6, wherein a shear pin hole is formed in the middle body of the overshot (15) to penetrate through a shear pin (13), an inner cavity of the overshot (15) provided with a locking claw nut matching cavity is arranged below the shear pin (13), and reverse locking teeth matched with reverse locking teeth of the outer circle of the lower part of the locking claw (16) are arranged below the locking claw nut matching cavity.
9. The fishing tool for reducing shoulder broken sucker rods as claimed in claim 6, wherein the outer circle of the lower part of the locking claw body (161) is provided with a reverse locking tooth, the claw body (162) is arranged at the lower part of the locking claw body (161), the inner wall of the lower end of the claw body (162) is also provided with an inner claw (163), and the included angle alpha between the claw convex upper inclined surface of the inner claw (163) and the axis is an acute angle smaller than 90 degrees.
10. The fishing tool for the variable-diameter shoulder fracture sucker rod according to claim 6, 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 a fishing rod column through the connecting pipe (51), and a liquid discharge channel (511) is arranged in the pipe body of the connecting pipe (51); the two ends of the pipe body of the connecting pipe (51) are respectively provided with an internal thread and an external thread, the connecting pipes (51) can be connected with each other through threads, and the connection length or 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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| CN202011166764.XA CN114482898B (en) | 2020-10-27 | 2020-10-27 | Fishing tool for reducing shoulder fracture sucker rod |
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| CN114482898B true CN114482898B (en) | 2024-03-22 |
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| CN114482898A (en) | 2022-05-13 |
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