CN210087255U - Eccentric centralizer - Google Patents
Eccentric centralizer Download PDFInfo
- Publication number
- CN210087255U CN210087255U CN201920681998.4U CN201920681998U CN210087255U CN 210087255 U CN210087255 U CN 210087255U CN 201920681998 U CN201920681998 U CN 201920681998U CN 210087255 U CN210087255 U CN 210087255U
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- eccentric
- mandrel
- ratchet
- righting
- centralizer
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Abstract
The utility model provides an eccentric centralizer, relates to oil well drilling workover fishing tool technical field, including the dabber, install body and the elasticity closing device of rightting on the dabber lateral wall to and connect in the lower clutch of dabber lower extreme, the body of righting is eccentric structure, the spindle is equipped with first ratchet, the body of righting be equipped with the second ratchet that first ratchet engaged with, elasticity closing device be used for with the body of righting compresses tightly in the spindle. The eccentric centralizer provided by the embodiment of the utility model is provided with the ratchets meshed with the central spindle and the centralizing body, so that the centralizing body can rotate along with the central spindle when the central spindle rotates forwards, and eccentric fishing is realized; when the mandrel rotates reversely, the righting body does not rotate, so that the back-off operation is realized.
Description
Technical Field
The utility model relates to an oil well bores workover fishing tool technical field, concretely relates to eccentric centralizer.
Background
During the production process of the oil well, some falling fish which is not centered can be generated due to various reasons, or the falling fish is in an eccentric structure, so that the fishing position is in an eccentric position. Aiming at the fishing of the eccentric fish, the current main solving method comprises the following steps: 1) a guide shoe with a large diameter is designed on the fishing tool to centralize the fish from the outer diameter direction of the end part of the fish to realize alignment fishing; 2) the bottom end of the tool is provided with a small-diameter guide head so as to lead the fishing tool into the inner cavity of the fallen fish; 3) the tool pipe column is additionally connected with an eccentric centralizer. However, the existing centering tool can only realize eccentric butt-buckling fishing, and after a junk is fished, the rotating back-off cannot be realized due to the influence of the size relation between the centering block and the inner wall of the sleeve.
SUMMERY OF THE UTILITY MODEL
In order to can also carry out the back-off operation under satisfying the eccentric condition of salvaging, an embodiment of the utility model provides an eccentric centralizer, include the dabber, install body and the elasticity closing device of rightting on the dabber lateral wall, and connect in the lower clutch of dabber lower extreme, it is eccentric structure to right the body, the spindle is equipped with first ratchet, right be equipped with on the body with the second ratchet that first ratchet engaged with, elasticity closing device be used for with it compresses tightly to right the body the spindle is last.
Has the advantages that:
the eccentric centralizer provided by the embodiment of the utility model is provided with the ratchets meshed with the central spindle and the centralizing body, so that the centralizing body can rotate along with the central spindle when the central spindle rotates forwards, and eccentric fishing is realized; when the mandrel rotates reversely, the righting body does not rotate, so that the back-off operation is realized.
Drawings
The accompanying drawings are included to provide a further understanding of the technical solutions of the present invention, and are incorporated in and constitute a part of this specification, together with the embodiments of the present invention for explaining the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.
Fig. 1 is a schematic structural view of an eccentric centralizer according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view taken at A-A of FIG. 1;
the reference signs are: 1. lower clutch, 2, sealing washer, 3, backstop screw, 4, sealing washer, 5, first gasket, 6, spring, 7, the body of rightting, 8, second gasket, 9, dabber, 10, second ratchet.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.
As shown in fig. 1 and 2, an embodiment of the utility model provides an eccentric centralizer, include dabber 9, install body 7 and the elastic pressing device of righting on the dabber 9 lateral wall, and connect in lower clutch 1 of dabber 9 lower extreme, body 7 is right to eccentric structure, be equipped with first ratchet on the dabber 9, be equipped with on the body 7 of righting with the second ratchet 10 that first ratchet engaged with, the elastic pressing device be used for with it compresses tightly to right body 7 on the dabber 9.
The eccentric centralizer of the embodiment can realize eccentric fishing and back-off operation of falling objects in an eccentric state. In the fishing operation, the drilling tool rotates forwards to drive the mandrel 9 to rotate forwards, and the centering body 7 rotates forwards along with the mandrel 9 through the ratchets which are meshed with the centering body 7 and the mandrel 9, so that eccentric fishing is realized. When the fishing tool carries out reverse rotation of the drilling tool after fishing the fallen objects, the ratchet on the mandrel 9 and the ratchet of the righting body 7 can generate relative displacement, the mandrel 9 can rotate, but the righting body 7 does not rotate, and therefore reverse-buckling operation is achieved. When the fishing can not be reversed, the fishing tool can be knocked out from the lower part of the fishing tool, so that the operation safety is ensured.
In this embodiment, the mandrel 9 is a tubular structure, the centralizing body 7 is sleeved outside the mandrel 9, a shoulder is arranged on the outer side wall of the mandrel 9, the first ratchet is arranged on the shoulder, and the second ratchet 10 is arranged on the upper end face of the centralizing body 7.
The elastic pressing device comprises a spring 6 sleeved on the mandrel 9, one end of the spring 6 is fixed, and the other end of the spring is abutted to the righting body 7. In this way, the righting body 7 is pressed against the righting body 7 by the elastic force of the spring 6, so that the first ratchet and the second ratchet 10 can be tightly engaged. One end of the spring 6 can abut against the mandrel 9 or the lower joint 1, and the other end of the spring 6 can abut against the lower end face of the righting body 7.
A first gasket 5 is arranged between one end of the spring 6 and the mandrel 9 or the lower joint 1, and a second gasket 8 is arranged between the other end of the spring 6 and the lower end face of the centralizing body 7. The first and second spacers 5 and 8 are provided to make the both ends of the spring 6 closely contact with the abutting parts, and the spring 6 provides a smooth pressing force on the righting body 7.
The lower end of the mandrel 9 is in threaded connection with the lower joint 1, and can be in sawtooth-shaped threaded connection, and the sawtooth-shaped threads can improve the lifting force of a tool and facilitate disassembly, assembly and maintenance. Wherein, lower clutch 1 can be used to be connected with the lower part connecting piece, can set up the external screw thread on dabber 9, and the corresponding internal thread that sets up on lower clutch 1, the one end of spring 6 can the butt on the up end of lower clutch 1.
The mandrel 9 and the lower joint 1 are provided with the retaining screw 3 therebetween, so that reverse thread buckling can be prevented, and the mandrel 9 is prevented from being disengaged from the lower joint 1 during reverse rotation. Dabber 9 with be equipped with the sealing washer between the lower clutch 1 for carry out the sealed of both junctions, the sealing washer can set up two, is located the both ends of dabber 9 and lower clutch 1 both junctions respectively, is sealing washer 4 and sealing washer 2 respectively, improves sealing performance.
The eccentric centralizer of this embodiment utilizes the ratchet of meshing mutually between body 7 and the dabber 9 to right, and dabber 9 rotates when realizing centralizer overall movement, reverse rotation and right body 7 motionless to realize corotation adjustment salvage position, reverse rotation and realize the purpose of back-off.
The eccentric centralizer of this embodiment can reduce the scope of salvaging the fish top in great space, is applicable to the casing and open hole well section, and mainly used fish chamber is in the salvage operation under eccentric state or the two fish top states in the shaft bottom, improves and salvages the operating efficiency.
In the eccentric centralizer of the embodiment, the upper end of the mandrel 9 can be connected with a downhole drilling tool through an upper connector, and the lower end of the mandrel is connected with a fishing tool through a lower connector 1. When the eccentric fish jack or double-fish jack fishing operation is carried out, the drilling tool is slowly lowered to a designated position, the fishing position is adjusted through positive rotation of the drilling tool, whether the fishing tool enters the fish cavity is judged, and whether the fish is fished or not is judged by lifting, observing the change condition of the hanging weight. When the back-off operation is needed, the drilling tool is reversed, the central spindle 9 rotates to right the body 7 to be fixed, the central spindle 9 drives the tool to rotate to realize the back-off, and finally the purpose of salvaging eccentric falling objects is realized.
The eccentric centralizer of this embodiment, each subassembly can be dismantled the change, and it is simple to maintain, has prolonged the life of instrument.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "fixedly connected," "mounted," and "assembled" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening elements, or may be connected through the interconnection between two elements. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.
Claims (8)
1. An eccentric centralizer, characterized by: the centering device comprises a mandrel, a centering body and an elastic pressing device, wherein the centering body and the elastic pressing device are arranged on the outer side wall of the mandrel, the lower joint is connected to the lower end of the mandrel, the centering body is of an eccentric structure, a first ratchet is arranged on the mandrel, a second ratchet meshed with the first ratchet is arranged on the centering body, and the elastic pressing device is used for pressing the centering body onto the mandrel.
2. The eccentric centralizer of claim 1, wherein: the outer side wall of the mandrel is provided with a shoulder, the shoulder is provided with the first ratchet, and the upper end face of the righting body is provided with the second ratchet.
3. The eccentric centralizer of claim 2, wherein: the elastic pressing device comprises a spring sleeved on the mandrel, one end of the spring is fixed, and the other end of the spring is abutted to the righting body.
4. The eccentric centralizer of claim 3, wherein: one end of the spring is abutted against the mandrel or the lower joint, and the other end of the spring is abutted against the lower end face of the centralizing body.
5. The eccentric centralizer of claim 4, wherein: a first gasket is arranged between one end of the spring and the mandrel or the lower joint, and a second gasket is arranged between the other end of the spring and the lower end face of the centralizing body.
6. The eccentric centralizer of claim 1, wherein: the lower end of the mandrel is in threaded connection with the lower joint.
7. The eccentric centralizer of claim 6, wherein: and a backstop screw is arranged between the mandrel and the lower joint.
8. The eccentric centralizer of claim 6, wherein: and a sealing ring is arranged between the mandrel and the lower joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920681998.4U CN210087255U (en) | 2019-05-13 | 2019-05-13 | Eccentric centralizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920681998.4U CN210087255U (en) | 2019-05-13 | 2019-05-13 | Eccentric centralizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210087255U true CN210087255U (en) | 2020-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920681998.4U Active CN210087255U (en) | 2019-05-13 | 2019-05-13 | Eccentric centralizer |
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| Country | Link |
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| CN (1) | CN210087255U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022256045A1 (en) * | 2021-06-03 | 2022-12-08 | Halliburton Energy Services, Inc. | Drill string with centralizer |
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2019
- 2019-05-13 CN CN201920681998.4U patent/CN210087255U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022256045A1 (en) * | 2021-06-03 | 2022-12-08 | Halliburton Energy Services, Inc. | Drill string with centralizer |
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