CN212428688U - Returnable fishing spear - Google Patents
Returnable fishing spear Download PDFInfo
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- CN212428688U CN212428688U CN202022180428.2U CN202022180428U CN212428688U CN 212428688 U CN212428688 U CN 212428688U CN 202022180428 U CN202022180428 U CN 202022180428U CN 212428688 U CN212428688 U CN 212428688U
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- slip
- seat
- mandrel
- lance
- spear
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Abstract
The utility model belongs to oil gas field borehole operation instrument field, in particular to can move back formula drag for lance. A retractable fishing spear comprises an upper joint, a spear, a slip seat and a spear head which are connected in sequence; a ball seat and a mandrel are sequentially arranged in the lance from top to bottom, a release spring is arranged outside the mandrel, the mandrel is connected with the slip seat through a pre-tightening pin, and a stroke pin groove is formed in the mandrel; the slip seat is provided with a groove-shaped hole, and a fishing spring and a slip are arranged outside the slip seat; the slip is provided with a stroke pin hole, and the slip is connected with the slip seat and the mandrel through a stroke pin. The utility model discloses utilize the slips and the slip bowl inclined plane relative movement, the internal surface of clenching the tubular column that falls in the well realizes falling in the well tubular column and salvages, through adopting "spring + stroke pin" mechanical structure to promote slips reverse motion, releases the tubular column that falls in the well, need not the reversal tubular column when withdrawing from the tubular column that falls in the well, easy operation, safe and reliable.
Description
Technical Field
The utility model belongs to oil gas field borehole operation instrument field, in particular to can move back formula drag for lance.
Background
In the process of exploration and development of oil and gas fields, from drilling, well repairing, oil and gas fracturing testing and production putting, a pipe column is always accompanied by the full life cycle of one well, basically all operation procedures can not be separated from the pipe column, and only few operations can be replaced by cables. The frequent use of the pipe column, together with the reasons of complex geological conditions, immature process, limited skill level of operators and the like on the site, causes the phenomenon that the operation pipe column breaks off the well, if the pipe column falling off the well can not be salvaged, the phenomenon is equal to that the well is directly scrapped, great economic loss is caused, and the loss of petroleum exploration and development is immeasurable.
At present, some common fishing tools, such as a male cone, a female cone, a fishing spear (a retractable fishing spear), a fishing barrel (a retractable fishing barrel) and the like, can realize the fishing of a pipe column falling into a well, but in general situations, the pipe column falling into the well is lifted up after being fished and is blocked, so that the processing is very difficult, and therefore, the tool is very important to be withdrawn from the falling pipe after being blocked. Some existing withdrawable fishing tools also have the function of withdrawing fallen fish, but the principle is realized by the mode of striking the tubular column downwards, reversing and reversing, and due to the influence of factors such as well type, well inclination angle and reversing turns which are difficult to master, especially when the tubular column is fished in the horizontal section of the horizontal well, the condition of withdrawing the fallen fish is very few, especially the reversing operation is often realized at the position which is not reversed, and as a result, the shaft is complex and can not be processed, and the secondary shaft is complex and appears, so that accident superposition accidents are caused.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model aims at providing a can move back formula drags for lance when the internal surface through the relative movement of slips and slip seat inclined plane, clenching the well tubular column realizes the well tubular column and salvages, changes the mode that original reversal withdraws from the fish, realizes withdrawing from the function of meeting the card fish through hydraulic mode, can effectively prevent complicated enlargements in the pit.
The technical scheme of the utility model lies in: a retractable fishing spear comprises an upper connector, a spear, a slip seat and a spear head which are connected in sequence; the upper joint, the lance and the slip seat are hollow to form a through inner flow passage, and the upper part of the upper joint is connected with an external oil pipe; a ball seat and a mandrel are sequentially arranged in the lance from top to bottom, a release spring is arranged outside the mandrel, the mandrel is connected with the slip seat through a pre-tightening pin, and a stroke pin groove is formed in the mandrel; the slip seat is provided with a groove-shaped hole, and a fishing spring and a slip are arranged outside the slip seat; the slips are provided with stroke pin holes and connected with the slip seat and the mandrel through stroke pins; and a central flow passage penetrating through the ball seat and the center of the mandrel.
The ball seat is in threaded connection with the mandrel, the outer diameter of the ball seat is the same as the inner diameter of the lance and larger than the outer diameter of the mandrel, and the release spring is located in an annular space formed by the ball seat, the mandrel, the slip seat and the lance.
The slip seat is in threaded connection with the lower portion of the lance, the outer diameter of the slip seat is smaller than the outer diameters of the lance and the slips, and the fishing spring is located in an annular groove formed by the slip seat, the lance and the slips.
The spearhead is in threaded connection with the lower part of the slip seat, a guide head is arranged at the lower end of the spearhead, and a spearhead flow passage is formed in the center of the spearhead.
The width of the slot-shaped hole is the same as the width of the travel pin slot and is equal to the outer diameter of the travel pin hole.
The inner side of the upper part of the ball seat is provided with a 45-degree chamfer.
The slips of the slips are left-handed slips, and the number of the slips is at least 3.
The upper connecting end of the upper joint is in a conventional oil pipe female thread buckle type.
The technical effects of the utility model reside in that: 1. the utility model discloses utilize the slips and the slip bowl inclined plane relative movement, the internal surface of clenching the tubular column that falls in the well realizes falling in the well tubular column and salvages, simple structure, and convenient operation can realize falling in the well tubular column salvage fast. 2. The utility model discloses a directly suppress in the fishing spear behind the bowling, cut off the pretension pin, adopt "spring + stroke pin" mechanical structure to promote slips reverse motion, release the tubular column that falls into the well, need not the reversal tubular column when withdrawing from the tubular column that falls into the well, easy operation, safe and reliable.
The following will be further described with reference to the accompanying drawings.
Drawings
Fig. 1 is the utility model relates to a structure schematic diagram that formula of can moving back drags lance pretension pin and does not cut, slips become to salvage well tubular column operating condition.
Fig. 2 is the utility model relates to a structural schematic diagram of the formula of can moving back spear pretension pin is cut off, slips become release well tubular column operating condition.
Reference numerals: 1-top connection, 2-ball seat, 3-release spring, 4-mandrel, 5-spear, 6-fishing spring, 7-pre-tightening pin, 8-slip seat, 9-travel pin hole, 10-slip, 11-spearhead, 12-guide head, 13-spearhead flow channel, 14-internal flow channel, 15-groove type hole, 16-travel pin groove, 17-travel pin, 18-central flow channel.
Detailed Description
Example 1
In order to overcome current formula of can moving back fishing tool and realize withdrawing from when the fish through the mode of hitting down the tubular column and reversal, back-off, receive the influence of factors such as well type, inclination, the number of turns of reversal are difficult to hold, arouse the complicated problem of secondary pit shaft easily, the utility model provides a as shown in figure 1 formula of can moving back fishing spear, the utility model discloses utilize the relative movement on slips and slip seat inclined plane, the internal surface that bites tight tubular column that falls down to realize the tubular column of falling into the well and salvage, directly suppress, cut the pretension pin in fishing spear through throwing the ball, adopt "spring + stroke pin" mechanical structure to promote slips reverse motion, release tubular column that falls into the well, need not the tubular column that reverses when withdrawing from the tubular column that falls into the well, easy operation, safe and reliable.
As shown in fig. 1, a retractable fishing spear comprises an upper connector 1, a spear 5, a slip seat 8 and a spear head 11 which are connected in sequence; the upper connector 1, the lance 5 and the slip seat 8 are hollow to form a through inner flow passage 14, and the upper part of the upper connector 1 is connected with an external oil pipe;
a ball seat 2 and a mandrel 4 are sequentially arranged in the lance 5 from top to bottom, a release spring 3 is arranged outside the mandrel 4, the mandrel 4 is connected with the slip seat 8 through a pre-tightening pin 7, and a stroke pin groove 16 is formed in the mandrel 4;
a groove-shaped hole 15 is formed in the slip seat 8, and a fishing spring 6 and a slip 10 are arranged outside the slip seat 8; the slip 10 is provided with a stroke pin hole 9, and the slip 10 is connected with the slip seat 8 and the mandrel 4 through a stroke pin 17;
the ball seat 2 and the mandrel 4 form a central flow passage 18 through the center.
The utility model discloses a salvage the relative movement on spring 6 drive slips 10 and 8 inclined planes of slip seat, the internal surface of clenching the tubular column that falls in the well realizes falling in the well tubular column and salvages, through shutoff ball seat 2 behind the bowling, central runner 18 closes, salvage lance upper portion suppress, cut off pretension pin 7, release spring 3 drives dabber 4 and stroke pin 16 and promotes slips 10 reverse motion, release tubular column that falls in the well, need not the reversal tubular column when withdrawing from the tubular column that falls in the well, and easy operation, safety and reliability.
Example 2
Preferably, on the basis of embodiment 1, in this embodiment, the ball seat 2 is screwed to the mandrel 4, the outer diameter of the ball seat 2 is the same as the inner diameter of the lance 5 and is larger than the outer diameter of the mandrel 4, and the release spring 3 is located in an annular space formed by the ball seat 2, the mandrel 4, the slip seat 8 and the lance 5.
In practical use, the release spring 3 is vertically limited by the ball seat 2 and the slip seat 8 respectively, and when the pre-tightening pin 7 is sheared off, the spring 3 is compressed and extended to drive the ball seat 2 to move up and down, so that the slip 10 is driven to move reversely to release the well-falling pipe column.
Preferably, the slip bowl 8 is connected with the lower part of the lance 5 by screw threads, the outer diameter of the slip bowl 8 is smaller than the outer diameter of the lance 5 and the slips 10, and the fishing spring 6 is positioned in an annular groove formed by the slip bowl 8 and the lance 5 and the slips 10.
In actual use, the fishing spring 6 is limited by the lance 5 and the slip 10 from top to bottom respectively, and when the slip 10 contacts the top of a fish, the fishing spring 6 is compressed and can drive the slip 10 to move upwards, so that the slip 10 and the slip seat 8 move relatively to each other, the inner surface of a pipe column of a well is tightly bitten, and the pipe column of the well is fished.
Preferably, the spearhead 11 is in threaded connection with the lower part of the slip seat 8, the lower end of the spearhead 11 is provided with a guide head 12, and the spearhead 11 is provided with a spearhead flow passage 13 in the center.
In actual use, the lower extreme of spear 11 is equipped with guide head 12, and the toper of guide head 12 has guaranteed the utility model discloses the spear of returnable fishing spear can be convenient go deep into the inside of treating the fishing string, spear 11 center has spear runner 13 and can make returnable fishing spear carry out water conservancy sand washing operation at the in-process of beating, guarantees and the accurate butt joint of treating the fishing string to realize the well tubular column and salvage.
Preferably, the width of the slot-shaped hole 15 is the same as the width of the travel pin slot 16, and is equal to the outer diameter of the travel pin hole 9. The inner side of the upper part of the ball seat 2 is provided with a 45-degree chamfer.
In actual use, after the ball is thrown, the ball is tightly combined with the ball seat 2 to block the central flow passage 18, so that the upper part of the fishing spear is guaranteed to be pressed and cut off the pre-tightening pin 7.
Preferably, the slip teeth of the slip 10 are left-handed slip teeth, and the number of the slip is at least 3.
In actual use, the slip teeth of the slip 10 are left-handed slip teeth, so that the back-off operation can be realized when the tool cannot withdraw from the fish falling under special conditions, and the slip is good in universality and strong in applicability.
Preferably, the upper connection end of the upper joint 1 is of a conventional tubing box thread button type. Because used conventional thread button type, make the utility model discloses connection that can be convenient is on the working string, and need not to use special crossover sub.
A retractable fishing spear comprises the following specific use processes:
the method comprises the following steps: installing the retractable fishing spear before entering the well;
the retractable spear is required to be carefully checked and maintained when entering a well, lubricating grease is required to be coated on each movable part to ensure flexibility and effectiveness, meanwhile, whether the pre-tightening pin 7 is intact or not is checked, the damaged part is required to be replaced in time, whether the slips 10 are in a salvaging state or not and are matched with the outer diameter of a well-falling pipe column or not is checked, and whether the steel ball is matched with the ball seat 2 or not is checked;
step two: entering a well by the retractable fishing spear;
after the retractable fishing spear is qualified after being checked on the ground, the upper joint 1 is arranged at the foremost end of the fishing pipe column and enters a well, and the drilling speed is strictly controlled to be not more than 0.5m/s in the lowering process;
step three: salvaging a pipe column falling into the well;
the retractable fishing spear in a fishing state is characterized in that under the elastic force action of a fishing spring 6, a slip 10 is in contact with an inclined plane of a slip seat 8 and is lowered to about 100 meters away from a fish head, the drilling speed is controlled to be not more than 5m/min, the fish head is slowly lifted for 3-5m after being detected, the hanging weight is recorded, then a fishing pipe column is slowly lowered, the hanging weight is observed, whether the slip head 12 and the slip 10 enter the fish head or not is judged according to the change of the hanging weight, the fishing pipe column is slowly lifted, the slip 10 and the inclined plane of the slip seat 8 move relatively, the slip 10 bites the inner surface of a well pipe column, if the hanging weight is observed to be more than the weight of the fishing pipe column, the fish is fished, and the well pipe column is fished;
step four: disassembling the well-falling pipe column after being lifted out;
after the well dropping pipe column is fished out, the ground is lifted out, redundant pipe columns are cut off, the connecting threads of the spear 5 and the upper joint 1 are removed, and the tool can be withdrawn.
In the third step: after the retractable fishing spear catches the falling tubular column, if the hanging weight is far greater than the sum of the weights of the fishing tubular column and the falling tubular column in the slow lifting process, the falling tubular column is judged to be blocked, under the condition that the up-and-down movable drilling tool is still ineffective within the allowable lifting tension range, the drilling is given up in time to prevent the overload of a derrick lifting system, at the moment, the falling fish needs to be withdrawn, the tubular column is knocked down, the gripping force of the slip 10 and the inner surface of the falling tubular column is reduced, a steel ball is thrown from a wellhead and is seated on the ball seat 2 of the retractable fishing spear, as shown in figure 2, the pressure in the fishing tubular column pushes the mandrel 4 to move downwards, the pre-tightening pin 7 is sheared, the pressure is released, the release spring 3 is compressed and then extended, the mandrel 4 moves upwards under the elastic force of the release spring 3, meanwhile, the stroke pin 17 acts on the slip 10, the stroke pin groove 16 is pulled to move upwards, and the slip, the fishing pipe column is lifted to release the pipe column falling into the well when the pipe column is blocked.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.
Claims (8)
1. The utility model provides a can move back formula drag for lance which characterized in that: comprises an upper connector (1), a lance (5), a slip seat (8) and a lance head (11) which are connected in sequence; the upper connector (1), the lance (5) and the slip seat (8) are hollow to form a through inner flow passage (14), and the upper part of the upper connector (1) is connected with an external oil pipe;
a ball seat (2) and a mandrel (4) are sequentially arranged in the lance (5) from top to bottom, a release spring (3) is arranged outside the mandrel (4), the mandrel (4) is connected with the slip seat (8) through a pre-tightening pin (7), and a stroke pin groove (16) is formed in the mandrel (4);
a groove-shaped hole (15) is formed in the slip seat (8), and a fishing spring (6) and a slip (10) are arranged outside the slip seat (8);
the slip (10) is provided with a stroke pin hole (9), and the slip (10) is connected with the slip seat (8) and the mandrel (4) through a stroke pin (17);
and a central flow passage (18) which penetrates through the ball seat (2) and the center of the mandrel (4) is formed.
2. The retractable spear of claim 1, wherein: the ball seat (2) is in threaded connection with the mandrel (4), the outer diameter of the ball seat (2) is the same as the inner diameter of the lance (5) and larger than the outer diameter of the mandrel (4), and the release spring (3) is located in an annular space formed by the ball seat (2), the mandrel (4), the slip seat (8) and the lance (5).
3. The retractable spear of claim 1, wherein: the slip seat (8) is in threaded connection with the lower portion of the lance (5), the outer diameter of the slip seat (8) is smaller than the outer diameters of the lance (5) and the slips (10), and the fishing spring (6) is located in an annular groove formed by the slip seat (8), the lance (5) and the slips (10).
4. The retractable spear of claim 1, wherein: the spearhead (11) is in threaded connection with the lower part of the slip seat (8), a guide head (12) is arranged at the lower end of the spearhead (11), and a spearhead flow passage (13) is formed in the center of the spearhead (11).
5. The retractable spear of claim 1, wherein: the width of the groove-shaped hole (15) is the same as that of the stroke pin groove (16) and is equal to the outer diameter of the stroke pin hole (9).
6. The retractable spear of claim 1, wherein: the inner side of the upper part of the ball seat (2) is provided with a 45-degree chamfer.
7. The retractable spear of claim 1, wherein: the slip teeth of the slip (10) are left-handed slip teeth, and the number of the slip is at least 3.
8. The retractable spear of claim 1, wherein: the upper connecting end of the upper joint (1) is in an oil pipe female thread buckle shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022180428.2U CN212428688U (en) | 2020-09-29 | 2020-09-29 | Returnable fishing spear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022180428.2U CN212428688U (en) | 2020-09-29 | 2020-09-29 | Returnable fishing spear |
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| Publication Number | Publication Date |
|---|---|
| CN212428688U true CN212428688U (en) | 2021-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022180428.2U Active CN212428688U (en) | 2020-09-29 | 2020-09-29 | Returnable fishing spear |
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| CN (1) | CN212428688U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112049596A (en) * | 2020-09-29 | 2020-12-08 | 中国石油天然气集团有限公司 | Retractable fishing spear and fishing method |
-
2020
- 2020-09-29 CN CN202022180428.2U patent/CN212428688U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112049596A (en) * | 2020-09-29 | 2020-12-08 | 中国石油天然气集团有限公司 | Retractable fishing spear and fishing method |
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