CN218644251U - Constant-pressure anti-scaling hydraulic anchor - Google Patents
Constant-pressure anti-scaling hydraulic anchor Download PDFInfo
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- CN218644251U CN218644251U CN202222349804.5U CN202222349804U CN218644251U CN 218644251 U CN218644251 U CN 218644251U CN 202222349804 U CN202222349804 U CN 202222349804U CN 218644251 U CN218644251 U CN 218644251U
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Abstract
The invention relates to a constant-pressure anti-scaling hydraulic anchor which is used for oil field well completion. The anchor comprises an anchor body, an anchor tooth mechanism and a constant pressure mechanism, wherein the constant pressure mechanism comprises a constant pressure sleeve sleeved in an inner hole of the anchor body, and a piston and an isolation plug are sequentially sleeved above a lower connector in an annular space between the lower part of the inner hole of the anchor body and the constant pressure sleeve; a communicating hole is axially arranged on the piston body; an upper sealing surface and a lower sealing surface are formed between the upper part and the lower part of the inner hole of the isolating plug and the periphery of the constant pressure sleeve, and the diameter of the upper sealing surface is larger than that of the lower sealing surface; a conducting hole is arranged in the middle of the isolating plug, and a balance hole is arranged on the anchor body opposite to the conducting hole; the lower end of the constant pressure sleeve is provided with a shear pin groove, and a shear pin ring and a shear pin are sleeved on the shear pin groove. The upper part of the anchor body is provided with an air vent, the lower opening of the communicating hole is connected with a sealing joint, and the closed cavity is filled with hydraulic oil or a corrosion inhibitor solution. Locking threads are oppositely arranged on the constant pressure sleeve and the shear pin ring. Because the constant pressure mechanism and the closed cavity are arranged, when the packer is matched for use, the setting distance can be increased, and pipe column clamping is reduced.
Description
Technical Field
The invention belongs to the technical field of underground anchoring tools for oilfield development, and particularly relates to a constant-pressure anti-scaling hydraulic anchor which is used for water injection well completion or is matched with a double-anchoring packer for use.
Background
Hydraulic anchors are a widely used tool in oil field development downhole completion operations. The hydraulic anchor has simple structure and consists of anchor body, anchor teeth, pressing plate, spring, etc. The hydraulic anchor is mainly used for operations such as fracturing, acidizing, water injection, oil extraction and the like, and is used for anchoring a downhole tubular column. The hydraulic anchor is also used with the cooperation of two anchor packers sometimes, and conventional hydraulic anchor is beaten when the packer is set and is pressed and will be anchored on the sleeve pipe, and this can influence the setting of packer, reduces the compression distance of packer packing element. When the hydraulic anchor is used in a water injection well or an oil well with high water content, scales are often formed around the anchor teeth, so that the anchor teeth cannot be retracted, and the problem of pipe column clamping during operation is caused.
Disclosure of Invention
In order to solve the technical problem, the invention provides a constant-pressure anti-scaling hydraulic anchor. The hydraulic anchor can be anchored on the inner wall of the casing pipe when the internal pressure reaches a design value, and when the hydraulic anchor is matched with a double-anchoring hydraulic packer for use, the setting stress state of the packer can be improved, and the setting distance of the packer is increased. Meanwhile, hydraulic oil or corrosion inhibitor solution is filled in the constant pressure sleeve, so that the scaling phenomenon around the anchor teeth is prevented, and the pipe column clamping faults during operation are reduced.
In order to realize the purpose, the invention adopts the following technical scheme:
a constant-pressure antiscale hydraulic anchor comprises an anchor body, an anchor tooth mechanism and a constant-pressure mechanism, wherein the constant-pressure mechanism comprises a constant-pressure sleeve, the inner hole of the anchor body is coaxially sleeved with the constant-pressure sleeve, and a first sealing ring is arranged between the upper end of the constant-pressure sleeve and the anchor body; a piston and an isolating plug are sequentially sleeved above the lower joint in an annulus between the lower part of the inner hole of the anchor body and the constant pressure sleeve; a second sealing ring and a third sealing ring are respectively arranged between the upper part and the lower part of the inner hole of the piston and the periphery of the constant pressure sleeve, and a pressure transfer hole is arranged on the side wall of the constant pressure sleeve between the second sealing ring and the third sealing ring; a communicating hole is axially arranged on the piston body; an upper sealing surface and a lower sealing surface are formed between the upper part and the lower part of the inner hole of the isolating plug and the periphery of the constant pressure sleeve, a sealing ring IV is arranged at the upper sealing surface, a sealing ring V is arranged at the lower sealing surface, and the diameter of the upper sealing surface is larger than that of the lower sealing surface; a sixth sealing ring and a seventh sealing ring are respectively arranged between the upper and lower parts of the periphery of the isolating plug and the inner hole of the anchor body, a transmission hole is radially arranged in the middle of the isolating plug, and a balance hole is radially arranged on the anchor body opposite to the transmission hole; the periphery of the lower end of the constant pressure sleeve is provided with a shear pin groove, a shear pin ring is sleeved on the shear pin groove, and the shear pin is installed on the shear pin ring which is axially fixed between the isolation plug and the lower joint.
Furthermore, an air vent is arranged at the upper part of the anchor body and communicates with an annular space between the outside of the anchor body and the constant pressure sleeve and the anchor body, and a blind plug is connected with an outer opening of the air vent through threads; the lower opening of the communicating hole is in threaded connection with a sealing joint, and hydraulic oil or corrosion inhibitor solution is filled in the closed cavity. The constant pressure sleeve and the shear pin ring are oppositely provided with sawtooth-shaped locking threads, and the shear pin ring is C-shaped.
Compared with the prior art, the invention has the advantages that:
1. because the constant pressure sleeve is arranged, the hydraulic anchor can be anchored on the wall of the sleeve when reaching the design pressure, and when the hydraulic anchor is matched with a double-anchor packer for use, the setting stress state of the packer can be improved, and the setting distance of the packer is increased.
2. Because the closed cavity is additionally arranged and the hydraulic oil or the corrosion inhibitor solution is filled in the closed cavity, the anchor tooth surrounding scale formation is prevented, the service life is prolonged, and the risk of operating the pipe column clamping is reduced under the production environment of a water injection well or a high-salinity oil well.
The technical solution of the present invention is further described with reference to the accompanying drawings and specific embodiments.
Drawings
A more complete understanding of the present invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein the same is by way of illustration of the invention and is intended to provide a further understanding of the invention and is to be considered as a part of the specification, the illustrative embodiments of the invention and the description thereof, and the following drawings are to be construed as illustrative of the invention and not limiting thereof.
FIG. 1 is a schematic structural view of a constant-pressure anti-scaling hydraulic anchor of the present invention.
Fig. 2 is another structural schematic diagram of the constant-pressure anti-scaling hydraulic anchor of the invention.
In the figure: 1-an anchor body, 2-a sealing ring I, 3-an anchor tooth mechanism, 4-a constant pressure sleeve, 5-a piston, 6-a communication hole, 7-a sealing ring six, 8-an isolation plug, 9-a balance hole, 10-a sealing ring seven, 11-a shear pin ring, 12-a shear pin, 13-a lower joint, 14-a sealing ring II, 15-a pressure transfer hole, 16-a sealing ring III, 17-a sealing ring IV, 18-a pressure transfer hole, 19-a sealing ring V, 21-a blind plug, 22-an air release hole, 23-a sealing joint and 24-a closed cavity.
Detailed Description
In the specification and claims of the present application, the terms "upper" and "lower" refer to the positional relationship of the constant-pressure anti-scaling hydraulic anchor of the present invention in the use state, with the female thread on the upper side and the male thread on the lower side. When the inside and outside or the inside and outside of the pipe are described, the small radius is the inside or the inside in the radial direction, and the large radius is the outside.
Referring to fig. 1, the constant-pressure anti-scaling hydraulic anchor comprises an anchor body 1, an anchor tooth mechanism 3 and a constant-pressure mechanism, wherein the constant-pressure mechanism comprises a constant-pressure sleeve 4, the constant-pressure sleeve 4 is coaxially sleeved in an inner hole of the anchor body, and a first sealing ring 2 is arranged between the upper end of the constant-pressure sleeve and the anchor body; a piston 5 and an isolating plug 8 are sleeved in an annular space between the lower part of the inner hole of the anchor body and the constant pressure sleeve above the lower joint 13 in sequence; a second sealing ring 14 and a third sealing ring 16 are respectively arranged between the upper part and the lower part of the inner hole of the piston and the periphery of the constant pressure sleeve, and a pressure transfer hole 15 is arranged on the side wall of the constant pressure sleeve between the second sealing ring and the third sealing ring; a communication hole 6 is axially arranged on the piston body; an upper sealing surface and a lower sealing surface are formed between the upper part and the lower part of the inner hole of the isolating plug and the periphery of the constant pressure sleeve, a fourth sealing ring 17 is arranged at the upper sealing surface, a fifth sealing ring 19 is arranged at the lower sealing surface, and the diameter of the upper sealing surface is larger than that of the lower sealing surface. A sixth sealing ring 7 and a seventh sealing ring 10 are respectively arranged between the upper and lower parts of the periphery of the isolating plug and the inner hole of the anchor body, a guide hole 18 is radially arranged in the middle of the isolating plug, and a balance hole 9 is radially arranged on the anchor body opposite to the guide hole; the periphery of the lower end of the constant pressure sleeve is provided with a shear pin groove, a shear pin ring 11 is sleeved on the shear pin groove, a shear pin 12 is installed on the shear pin ring, and the shear pin ring is axially fixed between the isolation plug and the lower joint.
The anchor tooth mechanism 3 comprises anchor teeth, a pressure plate, a spring, a screw and the like, is known technology and is widely applied to hydraulic anchor tools.
Furthermore, in order to prevent scaling around the anchor teeth, the upper part of the anchor body is provided with an air vent 22 which communicates with the annulus between the outside of the anchor body and the constant pressure sleeve 4 and the anchor body, and the outer opening of the air vent is in threaded connection with a blind plug 21; the lower opening of the communicating hole 6 is connected with a sealing joint 23 by screw thread.
The anchor body 1, the constant pressure sleeve 4 and the piston 5 together form a closed cavity 24. Hydraulic oil or a corrosion inhibitor solution is filled in the closed cavity 24 through the air bleed hole and the communicating hole.
The sealing joint 23 is a known technology and is widely used in offshore oilfield development downhole safety control systems. The sealing joint 23 comprises a double male joint and a sealing gland. When the hydraulic oil or the corrosion inhibitor solution is filled, the sealing pressure cap is detached, the double male connectors are connected with the filling pipeline, and after filling is finished, the sealing pressure cap and the blind plug are installed in place.
Furthermore, in order to prevent the piston sleeve from ascending upwards due to accidents after descending, the fixed pressure sleeve 4 and the shear pin ring 11 are provided with sawtooth-shaped locking threads relatively, and the shear pin ring is C-shaped. The periphery of the lower end of the piston sleeve is provided with a sawtooth-shaped external thread, and the length of the sawtooth-shaped external thread is larger than the descending distance of the piston sleeve. The shear pin ring is provided with a sawtooth-shaped internal thread. The sawtooth-shaped external thread and the sawtooth-shaped internal thread jointly form a locking thread pair. Locking thread pairs are known in the art and are widely used on downhole hydraulic packers.
It will be apparent that those skilled in the art can make many modifications and variations based on the spirit of the present invention.
Claims (3)
1. A constant-pressure antiscale hydraulic anchor comprises an anchor body (1) and an anchor tooth mechanism (3), and is characterized by further comprising a constant-pressure mechanism, wherein the constant-pressure mechanism comprises a constant-pressure sleeve (4), the constant-pressure sleeve (4) is coaxially sleeved in an inner hole of the anchor body, and a first sealing ring (2) is arranged between the upper end of the constant-pressure sleeve and the anchor body; a piston (5) and an isolating plug (8) are sleeved above a lower connector (13) in sequence in an annular space between the lower part of an inner hole of the anchor body and the constant pressure sleeve; a second sealing ring (14) and a third sealing ring (16) are respectively arranged between the upper part and the lower part of the inner hole of the piston and the periphery of the constant pressure sleeve, and a pressure transfer hole (15) is arranged on the side wall of the constant pressure sleeve between the second sealing ring and the third sealing ring; a communicating hole (6) is axially arranged on the piston body; an upper sealing surface and a lower sealing surface are formed between the upper part and the lower part of the inner hole of the isolating plug and the periphery of the constant pressure sleeve, a fourth sealing ring (17) is arranged at the upper sealing surface, a fifth sealing ring (19) is arranged at the lower sealing surface, and the diameter of the upper sealing surface is larger than that of the lower sealing surface; a sixth sealing ring (7) and a seventh sealing ring (10) are respectively arranged between the upper and lower parts of the periphery of the isolating plug and the inner hole of the anchor body, a conducting hole (18) is radially arranged in the middle of the isolating plug, and a balance hole (9) is radially arranged on the anchor body opposite to the conducting hole; the periphery of the lower end of the constant pressure sleeve is provided with a shear pin groove, a shear pin ring (11) is sleeved on the shear pin groove, a shear pin (12) is installed on the shear pin ring, and the shear pin ring is axially fixed between the isolation plug and the lower joint.
2. The constant-pressure anti-scaling hydraulic anchor according to claim 1, wherein an air vent (22) is arranged at the upper part of the anchor body and is communicated with an annular space between the outside of the anchor body and the constant-pressure sleeve (4) and the anchor body, and a blind plug (21) is connected with an outer opening of the air vent in a threaded manner; the lower opening of the communicating hole (6) is in threaded connection with a sealing joint (23), and hydraulic oil or corrosion inhibitor solution is filled in the closed cavity (24).
3. A constant-pressure anti-scaling hydraulic anchor according to claim 1 or 2, wherein the constant-pressure sleeve (4) and the shear pin ring (11) are provided with saw-tooth-shaped locking threads oppositely, and the shear pin ring is C-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222349804.5U CN218644251U (en) | 2022-09-05 | 2022-09-05 | Constant-pressure anti-scaling hydraulic anchor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222349804.5U CN218644251U (en) | 2022-09-05 | 2022-09-05 | Constant-pressure anti-scaling hydraulic anchor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218644251U true CN218644251U (en) | 2023-03-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222349804.5U Active CN218644251U (en) | 2022-09-05 | 2022-09-05 | Constant-pressure anti-scaling hydraulic anchor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218644251U (en) |
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2022
- 2022-09-05 CN CN202222349804.5U patent/CN218644251U/en active Active
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