CN219953334U - Simple casing collar finder - Google Patents
Simple casing collar finder Download PDFInfo
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- CN219953334U CN219953334U CN202321054820.XU CN202321054820U CN219953334U CN 219953334 U CN219953334 U CN 219953334U CN 202321054820 U CN202321054820 U CN 202321054820U CN 219953334 U CN219953334 U CN 219953334U
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- groove
- righting block
- casing collar
- block
- outer side
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- 238000003801 milling Methods 0.000 claims description 7
- 230000008878 coupling Effects 0.000 abstract description 15
- 238000010168 coupling process Methods 0.000 abstract description 15
- 238000005859 coupling reaction Methods 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000010008 shearing Methods 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- Earth Drilling (AREA)
Abstract
The utility model relates to the technical field of oilfield development, and discloses a simple casing collar finder, which comprises: the shear pin comprises a body, a groove body, a parallel cap, a righting block, a limiting ring, a bow spring and a release shear pin; the upper part and the lower part of the body are respectively provided with oil pipe connecting threads, the upper part of the body is provided with longitudinal grooves which are matched with the quantity of released shear nails, and the lower part of the body is provided with a reducing section; the groove body is sleeved outside the body, the release shear pin radially stretches into a longitudinal groove at the upper part of the body, the inner side of the bow spring is abutted against the outer wall of the body, the outer side of the bow spring is abutted against the righting block, and the righting block is radially extruded and expanded; the outer side of the righting block is provided with a boss with different guide cone angles, the outer part of the righting block is provided with a snap spring mounting groove, the righting block is arranged on the groove body and is radially limited by the parallel cap, and the cap is in threaded connection with the groove body; the limiting ring is arranged on the outer side of the lower part of the body through threads. The beneficial effects of the utility model are as follows: the casing coupling searching method is simple and convenient, and the field operation difficulty and the subsequent safety risk of the lifting pipe column are reduced.
Description
Technical Field
The utility model relates to the technical field of oilfield development, in particular to a simple casing collar finder.
Background
At present, the depth requirements of the oil-water well fine layering operation on target tools (mainly packers and bridge plugs) are higher and higher, and the interlayer between partial oil-water wells is thin, so that the requirements on the positions of the target tools are very strict. For accurately positioning a target tool, the conventional methods in the oil field are logging positioning and mechanical track type positioning, and the two methods have certain defects: 1. the logging positioning has high requirements on well site conditions, high cost and low efficiency; 2. when the mechanical track type positioner is positioned, a lifting and releasing pipe column is required to be carried out for rail changing operation, and the requirements on a shaft are high, the operation is complex and the difficulty is high; 3. when the track type positioner is in a casing coupling searching state in well completion, a large load is involved when the long-time post-lifting pipe column searches the casing coupling, and meanwhile, the potential safety hazard of the large load strong lifting pipe column is large because of forgetting the track type positioner.
Disclosure of Invention
In view of the above-mentioned technical drawbacks of the conventional solutions for accurately locating a target tool, the present utility model aims to provide a simple casing collar finder, which reduces the difficulty of field operation and the subsequent safety risk of the casing string by a compact structure and a simpler casing collar finding method.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a simple casing collar finder comprising: the shear pin comprises a body, a groove body, a parallel cap, a righting block, a limiting ring, a bow spring and a release shear pin; the upper part and the lower part of the body are respectively provided with oil pipe connecting threads, the upper part of the body is provided with longitudinal grooves which are matched with the quantity of released shear nails, and the lower part of the body is provided with a reducing section for releasing the searching state of the sleeve; the groove body is sleeved outside the body, the release shear pin radially stretches into a longitudinal groove at the upper part of the body to hang the groove body and the body, the inner side of the bow spring is abutted against the outer wall of the body, and the outer side of the bow spring is abutted against the centralizing block and radially extrudes and expands the centralizing block; the outer side of the centralizing block is provided with a boss with different guide cone angles, the centralizing block is arranged on the groove body and is radially limited by a cap, and the cap is in threaded connection with the groove body; the limiting ring is arranged on the outer side of the lower part of the body through threads.
Further, an inner notch is formed in the inner cavity of the centralizing block, and the outer side of the bow spring is propped against the inner notch.
Further, a snap spring mounting groove is formed in the outer portion of the righting block.
Further, the centering block also comprises a clamping spring, and the clamping spring is tightly pressed in the clamping spring mounting groove of the centering block.
Further, a milling window is arranged on the groove body, and the righting block is arranged in the milling window on the groove body.
Further, the number of the cap is 2, and one cap is arranged on each upper part and the other lower part.
Further, the groove body can slide along the body.
Advantageous effects
Compared with the existing segmented volume fracturing scheme, the method has the following advantages:
1. the tool (namely a simple casing collar finder, the same as the description below) has simpler structure and lower cost, and is not limited by well site conditions.
2. The method for searching the sleeve is simple and practical, does not need complicated rail changing operation, and has small field construction difficulty.
3. The pipe column can be lifted after the casing collar searching is finished to release the casing collar searching function, so that the pipe column is lifted for a long time without safety risk.
4. Even if the casing collar searching function is not released during well completion, the designed shearing force for releasing the shear pins is quite reasonable, the pipe string is easily pulled for a long time, the pipe string is sheared off, the casing collar searching function is released, and the safety risk is small.
Drawings
FIG. 1 is a schematic view of the present utility model in a down hole condition;
FIG. 2 is a schematic diagram of a casing collar seeking state as it is lifted up in accordance with the present utility model;
FIG. 3 is a schematic diagram of the casing collar of the present utility model in a condition in which the seeking function is disengaged.
Legend description:
1. the shear pin comprises a body, 2, a groove body, 3, a cap, 4, a righting block, 5, a limiting ring, 6, a bow spring, 7 clamp springs, 8 and a release shear pin.
Detailed Description
Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.
In order to facilitate understanding of technical terms in the technical scheme of the utility model, the following explanation is provided:
1. casing collar: the oil field is connected with the metal parts of the two sleeve bodies by double female threads.
2. The sleeve body: the oil field is provided with sleeve external threads at two ends, and the inner wall of the sleeve body has no diameter change.
3. And (3) pipe column: the oil field is specially used for connecting all well-entering oil pipes and tools by taking the oil pipe as a transmission pipe.
4. Positioning: this patent is directed to correcting and determining depth for tools requiring precise depth.
5. Milling a window: and milling a longitudinal window machined on the pipe body.
As shown in fig. 1, a simple casing collar finder according to an embodiment of the present utility model includes: the shear pin release device comprises a body 1, a groove body 2, a parallel cap 3, a righting block 4, a limiting ring 5, a bow spring 6, a clamp spring 7 and a release shear pin 8; the upper and lower parts of the body 1 are provided with oil pipe connecting threads which can be normally connected with a transmission oil pipe or other tools, the upper part of the body 1 is provided with longitudinal grooves matched with the quantity and the size of the release shear pins 8, and the lower part of the body 1 is provided with a reducing section for releasing the searching state of the sleeve; the groove body 2 is sleeved outside the body 1, and the release shear pin 8 radially stretches into a longitudinal groove at the upper part of the body 1 to hang the groove body 2 and the body 1, so that the groove body 2 is allowed to slide along the body 1 within a certain range; the inner side of the bow spring 6 is abutted against the outer wall of the body 1, and the outer side is abutted against the notch of the inner cavity of the righting block 4 to radially squeeze and expand the righting block 4; the clamp spring 7 is normally in an expanded state and is tightly pressed in an external clamp spring mounting groove (a machined reducing groove) of the centralizing block 4, and when the elasticity of the bow spring 6 is reduced, the clamp spring 7 can be radially elastically recovered to help the centralizing block 4 to radially retract; the outer side of the righting block 4 is provided with protruding tables with different guide cone angles, the righting block 4 is arranged in a corresponding milling window on the groove body 2 and is radially limited by the cap 3, the cap 3 is in threaded connection with the groove body 2, and one righting block is respectively arranged at the upper part and the lower part; the limiting ring 5 is arranged on the outer side of the lower part of the body 1 through threads and is used for limiting the maximum stroke of downward sliding of the groove body 2 after the shear pins 8 are released to shear.
The casing collar is characterized in that: the casing coupling both ends are with tapering threaded connection casing body 1, because of the unable full length that occupies casing coupling internal thread of tapering screw thread, therefore can form an annular clearance at casing coupling inner chamber middle part section, this patent is the different mechanical properties when the boss that utilizes on the righting piece 4 when passing through this clearance discerns the casing coupling.
The working principle of the utility model is as follows:
as shown in fig. 1: when the tool goes down the well along with the pipe column, the centralizing block 4 radially contracts on the inner wall of the casing body section, the boss on the centralizing block 4 clings to the inner wall of the casing, the centralizing block 4 has a radial expansion trend under the elastic support of the bow spring 6, the groove body 2 moves up to the limit position of the body along the body due to friction between the boss of the centralizing block and the casing, and all accessories associated with the groove body 2 reach the upper dead point upwards; when the boss on the centralizing block 4 passes through the annular gap in the middle of the casing coupling, the boss of the centralizing block radially expands, the boss is embedded into the annular gap, and when the tool continues to descend, the slow-angle guide inclined plane below the boss is extruded, the centralizing block 4 is quickly recovered under small radial extrusion force, and the axial friction force generated by the centralizing block on the whole of the pipe column is small and can be almost ignored, so that the tool can be freely lowered.
As shown in fig. 2: when the tool descends to the vicinity of a designed position along with the pipe column, the pipe column is lifted, the groove body 2 descends to a shearing limit position along the body due to friction between the centralizing block boss and the sleeve, namely, the shear pin 8 is released to descend to abut against the bottom end of the groove at the upper part of the body, all accessories associated with the groove body 2 reach a shearing bottom dead center downwards, and the shear force of the shear pin 8 and the lower end of the groove supports the groove body 2, the centralizing block 4 and other parts; when the sleeve body slides in, the friction force of the centralizing block boss and the sleeve has little contribution to the whole pulling force of the tubular column, can be basically ignored, and the shearing force for releasing the shear pin 8 and the lower end of the groove is little, so that the integral strength of the shear pin 8 is not influenced; when the boss on the centralizing block 4 passes through the annular gap in the middle of the casing coupling, the boss radially expands, the boss is embedded into the annular gap, when the tool continues to ascend, the steep angle guide inclined plane below the boss is extruded, the centralizing block 4 can possibly recover only by needing great radial extrusion force, the axial tension generated by the centralizing block on the pipe column is great, the pipe column is continuously lifted, and as long as the load does not exceed the shearing strength for releasing the shear pins 8, the whole tension of the pipe column continuously rises, and the tool can be visually distinguished from the ground tension meter to be positioned on the casing body or the casing coupling, thereby realizing the searching work of the casing coupling.
Implementation of the buffering function: when the lug on the righting block 4 is just positioned in the annular gap in the middle of the casing coupling, the lug radially expands, the lug is embedded in the annular gap, and when a tool is used for replacing a single lifting pipe column at a short distance, the release shear pin 8 is hung in a longitudinal groove on the upper part of the body 1, the groove has a sufficient length, so that the release shear pin 8 cannot reach the lower end of the groove, the release shear pin 8 is not sheared, and the tool can be protected in a buffering way and normally put in.
As shown in fig. 3: when the boss on the centralizing block 4 passes through the annular gap in the middle of the casing coupling, the boss radially expands, the boss is embedded into the annular gap, when the tool continues to ascend, the steep angle guide inclined plane below the boss is extruded, the centralizing block 4 can recover only by needing great radial extrusion force, the axial pulling force generated by the whole pipe column is great, the pipe column is continuously lifted, when the load exceeds the shearing strength of the shear pins 8, the shear pins 8 are released to shear, the groove body drives the centralizing block 4, the bow spring 6, the cap 3 and the clamp spring 7 to descend to the limit ring 5 to be limited, the bow spring 6 loses internal support due to the shrinkage of the lower part of the body 1, the elasticity is greatly reduced or vanished, the elastic recovery of the clamp spring 7 drives the centralizing block 4 to radially recover, the boss outer diameter on the centralizing block 4 is close to the inner diameter of the casing, the boss on the centralizing block 4 is easy to pass through the annular gap in the middle of the casing coupling, and the function of the casing coupling of the tool fails to be normally lifted.
The foregoing embodiments are merely illustrative of the principles and features of the present utility model, and are intended to enable those skilled in the art to practice the utility model and to provide an understanding of the principles and features of the utility model without limiting the scope of the utility model. All equivalent changes or modifications made according to the spirit of the main technical proposal of the utility model should be covered in the protection scope of the utility model.
Claims (7)
1. A simple casing collar finder, comprising: the shear pin comprises a body (1), a groove body (2), a cap (3), a righting block (4), a limiting ring (5), a bow spring (6) and a release shear pin (8); the upper part and the lower part of the body (1) are respectively provided with oil pipe connecting threads, the upper part of the body (1) is provided with longitudinal grooves which are matched with the release shear pins (8), and the lower part of the body (1) is provided with a reducing section for releasing the sleeve searching state; the groove body (2) is sleeved outside the body (1), the release shear pin (8) radially stretches into a longitudinal groove at the upper part of the body (1) to hang the groove body (2) and the body (1), the inner side of the bow spring (6) abuts against the outer wall of the body (1), and the outer side of the bow spring (6) abuts against the righting block (4) and radially extrudes and expands the righting block (4); the outer side of the righting block (4) is provided with a boss with different guide cone angles, the righting block (4) is arranged on the groove body (2) and is radially limited by the cap (3), and the cap (3) is in threaded connection with the groove body (2); the limiting ring (5) is arranged on the outer side of the lower part of the body (1) through threads.
2. A simple casing collar finder according to claim 1, wherein the inner cavity of the righting block (4) is provided with an inner notch, and the outer side of the bow spring (6) abuts against the inner notch.
3. A simple casing collar finder according to claim 1 or 2, characterized in that the outside of the righting block (4) is provided with a snap spring mounting groove.
4. A simple casing collar finder according to claim 3, further comprising a snap spring (7), the snap spring (7) being pressed into a snap spring mounting groove of the righting block (4).
5. A simple casing collar finder according to claim 1 wherein the housing (2) is provided with a milling window and the righting block (4) is mounted in the milling window on the housing (2).
6. A simple casing collar finder according to claim 1, characterized in that the number of caps (3) is 2 and one is mounted on each of the upper and lower parts.
7. A simple casing collar finder according to claim 1, characterized in that the groove (2) is slidable along the body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321054820.XU CN219953334U (en) | 2023-05-05 | 2023-05-05 | Simple casing collar finder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321054820.XU CN219953334U (en) | 2023-05-05 | 2023-05-05 | Simple casing collar finder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219953334U true CN219953334U (en) | 2023-11-03 |
Family
ID=88542894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321054820.XU Active CN219953334U (en) | 2023-05-05 | 2023-05-05 | Simple casing collar finder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219953334U (en) |
-
2023
- 2023-05-05 CN CN202321054820.XU patent/CN219953334U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |