CN113700468A - Suspension device for underground pressure gauge - Google Patents

Abstract

The invention belongs to the technical field of oil and gas field development engineering, and discloses a suspension device for an underground pressure gauge, which comprises a releasing tool, an upward movement prevention tool, a pressure gauge supporting cylinder, a flow guiding tool and a coupling positioner which are sequentially connected. When in use, the underground pressure gauge suspension device is put down to the underground and is positioned and clamped at a tubing coupling without moving upwards or downwards; the clamping mode of the tubing coupling can realize easy release and safe salvage of a highly deviated well section, and the test position is closer to a production layer, so that the collected data is more authentic. Meanwhile, the diversion tool and the upward movement prevention tool are matched for use, so that various testing tasks such as pressure recovery, productivity testing, interference well testing and the like can be completed.

Description

Suspension device for underground pressure gauge

Technical Field

The invention belongs to the technical field of oil and gas field development engineering, and particularly relates to a suspension device for an underground pressure gauge.

Background

At present, the slip type pressure gauge suspension device and the electronic type pressure gauge suspension device are mainly used in the industry. The slip type pressure gauge suspension device realizes the setting and hanging of the tubing wall by suddenly generating relative motion between a slip in a natural drooping state and a tool cone, and is difficult and has certain uncertain factors in the setting process. The electronic pressure gauge suspension device is divided into an electronic release tool and a clamping device, and is connected with the mechanical hook claw, so that the electronic pressure gauge suspension device must be conveyed to an underground specified depth before the time set in advance, waits for the automatic release of an electronic instrument, releases the hook claw to complete the setting, and the setting opportunity of the oil pipe must be ensured in the lowering process and cannot be controlled.

However, in the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:

the slip type pressure gauge suspension device has higher requirement on the operation skill of operators, and the well falling accident is easy to occur when the operators are not operated properly. Excessive occlusion of the slips on the wall of the oil pipe and the incapability of discharging the oil pipe coupling position seat placement easily cause later fishing failure and further can not meet the test operation requirements of a highly-deviated well section. Meanwhile, the anti-jacking mechanism is not designed, so that various types of tests such as productivity and interwell interference cannot be finished. The characteristic of the slip type suspension structure can not better provide the fluid flow area ratio required by pressure test, and is not suitable for pressure test under large output.

The battery and the circuit board of the electronic pressure gauge suspension device are limited in temperature and pressure resistance, and can only be used in a shallow layer and cannot be put into a sufficient well depth, so that the test requirement of a high-temperature high-inclination well section cannot be met. The seat clamping mode is completed by driving a mechanical claw by a downhole micro motor, so that the upward or downward large-amplitude deviation is easily caused, and even the well falls. Because the anti-jacking mechanism is not designed, various test types such as productivity, interwell interference and the like cannot be finished. The absence of a hollow flow channel in the tool does not better provide the fluid flow area ratio required for pressure testing. The supporting wheels of the suspension device are always tightly attached to the wall of the oil pipe in the fishing process, and the supporting wheels are expanded to be easily clamped at positions with enlarged inner diameters such as a wellhead Christmas tree and an underground safety valve, so that great potential safety hazards and risks exist.

Disclosure of Invention

The present invention aims to solve the above technical problem at least to some extent. Therefore, the invention aims to provide a suspension device for a downhole pressure gauge.

The technical scheme adopted by the invention is as follows:

a suspension device for an underground pressure gauge comprises a releasing tool, a pressure gauge supporting cylinder, a flow guiding tool and a coupling positioner which are sequentially connected; the water conservancy diversion instrument includes the fourth barrel, and the both ends of fourth barrel link to each other with top connection and connecting claw respectively, and the connecting claw includes that the circumference distributes a plurality of claws on the fourth barrel, and the opposite face epirelief of claw is equipped with the claw and colludes, has seted up the water conservancy diversion hole on the lateral wall of fourth barrel, and the fourth barrel is gone up the concave first helicla flute that is equipped with, and the one end of first helicla flute links to each other with the water conservancy diversion hole, and the other end extends to the tip of fourth barrel.

Preferably, one end of the upper joint in the fourth cylinder is a spherical surface, and the diversion hole is located on one side of the spherical surface.

Preferably, the number of the flow guide holes is multiple, and each flow guide hole is connected with one first spiral groove.

Preferably, the upper joint is in threaded connection with the fourth barrel, a boss abutted against the fourth barrel is arranged on the upper joint, and a second spiral groove communicated with the first spiral groove is arranged on the boss.

Preferably, the pressure gauge support cylinder comprises a third cylinder body, two ends of the third cylinder body are respectively connected with the first joint and the second joint, a first spring seat and a second spring seat are slidably mounted in the third cylinder body, an upper spring is arranged between the first spring seat and the first joint, and a lower spring is arranged between the second spring seat and the second joint; an upper circulation hole and a lower circulation hole are formed in the side wall of the third cylinder, the upper circulation hole is located on one side of the upper spring, and the lower circulation hole is located on one side of the lower spring.

Preferably, one end of the first spring seat facing the second spring seat is provided with a first counter bore, the other end of the first spring seat is provided with a second counter bore, the first counter bore is communicated with the second counter bore, and the upper spring is installed in the second counter bore.

Preferably, one end of the second spring seat facing the first spring seat is provided with a third counter bore, the other end of the second spring seat is provided with a fourth counter bore, the third counter bore is communicated with the fourth counter bore, and the lower spring is installed in the fourth counter bore.

Preferably, the releasing tool comprises a first cylinder, a first fishing neck is arranged at one end of the first cylinder, a sliding block is arranged in the first cylinder in a sliding manner, the sliding block is connected with the lower connector, a first pin is arranged on the sliding block, a strip-shaped hole is formed in the inner wall of the first cylinder, the first pin is arranged in the strip-shaped hole in a sliding manner, and a first spring is arranged between the sliding block and the first fishing neck; the lower joint is provided with a guide pin, the inner wall of the first cylinder is provided with a slideway, and the guide pin is slidably arranged in the slideway; the slideway comprises a long slideway arranged along the axis of the first barrel body and a short slideway obliquely connected with the long slideway.

Preferably, an anti-moving tool is arranged between the releasing tool and the pressure gauge support cylinder; the anti-upward-moving tool comprises a second cylinder body, a pair of supporting claws is arranged in the second cylinder body, the supporting claws are rotationally connected with the second cylinder body through rotating pins, and a second spring is arranged between the two supporting claws; a mandrel is arranged in the second cylinder in a sliding manner, the mandrel is connected with a first conical cap, and the first conical cap is in contact with the opposite surfaces of the two supporting claws; the rotating pin is positioned between the second spring and the first conical cap; the mandrel and the second cylinder are connected through a second pin.

Preferably, the coupling locator includes the mount pad, is equipped with a pair of elastic claw on the mount pad, is equipped with the spring card on the tip of elastic claw, wears to be equipped with the second in the mount pad and salvages the neck, and the second is salvaged and is overlapped on the neck and be equipped with the second taper cap.

The invention has the beneficial effects that:

the suspension device for the underground pressure gauge is used for being placed underground, and is located and clamped at a tubing coupling without moving upwards or downwards; the clamping mode of the tubing coupling can realize easy release and safe salvage of a highly deviated well section, and the test position is closer to a production layer, so that the collected data is more authentic. Meanwhile, the diversion tool and the upward movement prevention tool are matched for use, so that various types and large-yield test tasks such as pressure recovery, productivity test, interference well testing and the like can be completed.

Drawings

FIG. 1 is a schematic diagram of the construction of the downhole pressure gauge suspension of the present invention.

Fig. 2 is a schematic structural diagram of the releasing tool of the invention.

Fig. 3 is a schematic view of another angle structure of the releasing tool of the present invention.

Fig. 4 is a sectional view a-a of fig. 3.

Fig. 5 is a schematic structural view of the upward movement preventing tool of the present invention.

Fig. 6 is a schematic view of another angle of the anti-run-up tool of the present invention.

Fig. 7 is a sectional view of B-B of fig. 6.

FIG. 8 is a schematic view showing the structure of the pressure gauge holder according to the present invention.

FIG. 9 is a schematic view of another angle of the pressure gauge holder according to the present invention.

Fig. 10 is a cross-sectional view of C-C of fig. 9.

Fig. 11 is a schematic structural view of the flow guiding tool of the present invention.

Fig. 12 is a schematic view of another angle of the deflector tool of the present invention.

Fig. 13 is a cross-sectional view of D-D of fig. 12.

Figure 14 is a schematic diagram of the construction of the collar locator of the present invention.

Figure 15 is a schematic view of another angle configuration of the collar locator of the present invention.

Fig. 16 is a cross-sectional view of E-E of fig. 15.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

In the description of the embodiments of the present invention, it should be noted that the indication of the orientation or the positional relationship is based on the orientation or the positional relationship shown in the drawings, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, or the orientation or the positional relationship which is conventionally understood by those skilled in the art, is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or the element which is indicated must have a specific orientation, be constructed in a specific orientation and operate, and thus, cannot be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the present invention and drawings in the embodiments are understood in specific cases, and technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious for those skilled in the art that the described embodiments are a part of the embodiments of the present invention, and not all of the embodiments.

As shown in fig. 1, the suspension device for the downhole pressure gauge of the present embodiment mainly comprises a releasing tool 1, an upward movement prevention tool 2, a pressure gauge support cylinder 3, a flow guiding tool 4 and a coupling locator 5 which are connected in sequence. When in use, the underground pressure gauge suspension device is put down to the underground and is positioned and clamped at a tubing coupling without moving upwards or downwards. The clamping mode of the tubing coupling can realize easy release and safe salvage of a highly deviated well section, and the test position is closer to a production layer, so that the collected data is more authentic.

As shown in fig. 2 to 4, the releasing tool 1 mainly comprises a first cylinder 101, a first fishing neck 102, a slider 103, a lower joint 104, a first pin 105, a first spring 107 and a guide pin 108. The upper end of the first cylinder 101 is provided with a first fishing neck 102 through threaded connection, the sliding block 103 is slidably mounted in the first cylinder 101 and can slide along the axis of the first cylinder 101, the sliding block 103 is connected with the lower joint 104, and the lower end of the lower joint 104 is arranged outside the first cylinder 101.

Be equipped with first pin 105 on the slider 103, the bar hole 106 has been seted up to the symmetry on the inner wall of first barrel 101, and the both ends of first pin 105 are slidable mounting respectively in two bar holes 106, and first spring 107 is installed between slider 103 and the first neck 102 of salvaging, provides decurrent thrust to slider 103. A guide pin 108 is arranged on the lower joint 104, a slide way 109 is arranged on the inner wall of the first cylinder 101, and the guide pin 108 is slidably arranged in the slide way 109; the slideway 109 comprises a long slideway arranged along the axis of the first barrel 101 and a short slideway obliquely connected with the long slideway.

The first pin 105 can realize releasing after ensuring that the whole underground pressure gauge hanging device is successfully seated, and misoperation can be avoided to the maximum extent by adopting the releasing tool. The seating operation is easier to realize while ensuring the reliability in the process of the running operation.

As shown in fig. 5 to 7, the upward movement preventing tool 2 mainly includes a second cylinder 201, a pair of support claws 202, a rotation pin 203, a second spring 204, a spindle 205 and a first conical cap 206, a pair of support claws 202 are symmetrically installed in the second cylinder 201, the support claws 202 are rotatably connected to the second cylinder 201 through the rotation pin 203, the second spring 204 is disposed between the upper portions of the two support claws 202, and the second spring 204 provides a mutually deviating thrust force for the two support claws 202.

A mandrel 205 is arranged in the second cylinder 201 in a sliding mode, the mandrel 205 is connected with a first conical cap 206, the upper end of the first conical cap 206 is in contact with the opposite surfaces of the two supporting claws 202, and the rotating pin 203 is located between the second spring 204 and the first conical cap 206; the mandrel 205 and the second cylinder 201 are connected by a second pin having a smaller diameter than the first pin 105, i.e., the force to sever the second pin is less than the force to sever the first pin 105. After the suspension device of the downhole pressure gauge is lowered to the coupling locator 5 for locking, the second pin is firstly cut off, the first conical cap 206 can push the support claw 202 to rotate around the rotating pin 203 when extruding the support claw 202, and the lower part of the support claw 202 extends out of the second cylinder 201.

The anti-upward-moving tool 2 fully ensures the absolute safety of the fishing process. When needing to be explained, the coupling positioner 5 has certain fluid jacking prevention capacity after being seated, and under the condition that the diversion tool 4 meets the underground requirement, the upward movement prevention tool 2 can be omitted, and the releasing tool 1 and the pressure gauge support cylinder 3 can be directly butted.

As shown in fig. 8 to 10, the pressure gauge support cylinder 3 mainly includes a third cylinder 301, a first joint 302, a second joint 303, a first spring seat 304, a second spring seat 305, an upper spring 306 and a lower spring 307, the upper end of the third cylinder 301 is connected with the first joint 302 in a threaded manner, the lower end of the third cylinder 301 is connected with the second joint 303 in a threaded manner, the first spring seat 304 and the second spring seat 305 are slidably installed in the third cylinder 301, two ends of the upper spring 306 are respectively connected with the first spring seat 304 and the first joint 302, and two ends of the lower spring 307 are respectively connected with the second spring seat 305 and the second joint 303; the pressure gauge is installed between the first spring seat 304 and the second spring seat 305, the upper spring 306 provides a downward urging force of the first spring seat 304, and the lower spring 307 provides an upward urging force of the second spring seat 305, thereby fixing the pressure gauge.

An upper circulation hole 308 and a lower circulation hole 309 are formed in the side wall of the third cylinder 301, the upper circulation hole 308 is located on one side of the upper spring 306, and the lower circulation hole 309 is located on one side of the lower spring 307.

A first counterbore 310 is arranged at the end of the first spring seat 304 facing the second spring seat 305, and the shape of the first counterbore 310 substantially matches the shape of the tail of the pressure gauge; the other end of the first spring seat 304 is provided with a second counterbore, the first counterbore 310 is communicated with the second counterbore, and the upper spring 306 is installed in the second counterbore.

A third counterbore 311 is provided on the end of the second spring seat 305 facing the first spring seat 304, the third counterbore 311 being shaped to substantially match the shape of the head of the pressure gauge; the other end of the second spring seat 305 is provided with a fourth counterbore, the third counterbore 311 is communicated with the fourth counterbore, and the lower spring 307 is installed in the fourth counterbore.

One end of the first joint 302, which is far away from the second joint 303, is provided with a connecting threaded column 312, the connecting threaded column 312 is used for being connected with the mandrel 205 of the anti-moving tool 2, one end of the second joint 303, which is far away from the first joint 302, is provided with a mounting threaded hole 313, and the mounting threaded hole 313 is used for being connected with an upper joint 402 of the diversion tool 4.

The third cylinder 301, the first joint 302 and the second joint 303 are all provided with flat openings 314. The flat 314 facilitates the threaded mounting of the first and second connectors 302, 303 on the third barrel 301. After the first joint 302 and the second joint 303 are mounted in place, they are fixed to the third cylinder 301 again by means of set screws.

Through the through arrangement of the upper flow hole 308, the lower flow hole 309, the first spring seat 304 and the second spring seat 305, a larger fluid flow area can be provided so as not to affect test data; moreover, the matching use of pressure gauges with various outer diameter sizes can be met under the condition that the outer diameter of the third cylinder 301 is not increased; simultaneously, the design of the spring seat and the spring can play a good role in protecting the pressure gauge in the shocking operation.

As shown in fig. 11 to 13, the diversion tool 4 mainly includes a fourth cylinder 401, an upper joint 402 and a connecting claw 403, two ends of the fourth cylinder 401 are respectively connected with the upper joint 402 and the connecting claw 403, the connecting claw 403 includes six claws 404 circumferentially distributed on the fourth cylinder 401, opposite surfaces (i.e., inner surfaces) of the claws 404 are convexly provided with claw hooks 405, and the claw hooks 405 can fix an upper end boss of a second fishing neck 504 of the coupling locator 5 in the connecting claw 403, so that the diversion tool and the coupling locator can be easily butted.

Three flow guide holes 406 are uniformly distributed on the side wall of the fourth cylinder 401, three first spiral grooves 407 are further concavely arranged on the fourth cylinder 401, one end of each first spiral groove 407 is connected with one of the flow guide holes 406, and the other end extends to the end of the fourth cylinder 401.

The flow guiding tool 4 adopts a streamline spiral flow guiding design, the flow guiding port has no influence on high-precision tests such as pressure recovery and the like, and the action of the upper jacking force on the tool string is reduced.

The end of the upper joint 402 located in the fourth cylinder 401 is a spherical surface, as shown in fig. 13, the section of the spherical surface is a semi-ellipse, and three guiding holes 406 are located on one side of the spherical surface. The spherical end can reduce the impact force of the fluid, and at the same time, the spherical end is effectively guided to the flow guiding hole 406 and then flows away along the first spiral groove 407.

In this embodiment, the upper joint 402 is connected to the fourth cylinder 401 by a screw, and the upper joint 402 is further fixed to the fourth cylinder 401 by a fastening screw. The upper joint 402 is provided with a boss 408 abutted against the fourth cylinder 401, the boss 408 is provided with a second spiral groove 409 communicated with the first spiral groove 407, and fluid flows through the first spiral groove 407 and then enters the second spiral groove 409 to flow away.

And one end of the upper joint 402 departing from the connecting claw 403 is provided with a mounting threaded column, and the mounting threaded column is used for being connected with a higher-level pressure gauge supporting cylinder.

In practical use, a corresponding flow guiding tool is designed according to the upward jacking force possibly generated by the underground fluid under different well conditions, so that the upper instrument string can safely release the claw hook 405 from the second fishing neck 504 of the coupling positioner 5 by means of the tension of the steel wire under the condition that the coupling positioner can not be unlocked due to the complex condition occurring underground, and then the fishing tool string is reassembled to implement independent fishing on the coupling positioner.

As shown in fig. 14 to 16, the coupling locator 5 mainly includes a mounting seat 501, elastic claws 502, a spring clip 503 and a second fishing neck 504, the mounting seat 501 is substantially annular, a pair of elastic claws 502 is symmetrically arranged at the lower end of the mounting seat 501, the spring clip 503 is arranged at the end of the elastic claw 502, the second fishing neck 504 penetrates through the mounting seat 501, a second taper cap 505 is sleeved on the second fishing neck 504, and the second fishing neck 504 is fixed on the mounting seat 501 by screwing the second taper cap 505. The lower end of the great-inclination well throwing and fishing tool string is connected with a test instrument string adopting a releasing tool, stable releasing is carried out according to an operation design, a steel wire weight indicator is closely concerned in the process, the tool string is prevented from excessively fluctuating, the steel wire is lifted until a spring clamp 503 of a coupling locator is pulled up after reaching a preset depth, then the steel wire is slowly released until the coupling locator meets a resistance seat and is placed at the position of a coupling, the steel wire is slowly lifted up to pull a stroke of a jar, a first pin is slightly downwards jarred to cut off, meanwhile, a second cone cap 505 is made to descend to completely prop open an elastic claw 502, the steel wire is lifted up until the suspended weight is slightly larger than the total dead weight, then the steel wire is released until meeting the resistance, the steel wire is lifted up after the same operation is carried out once, an indicator shows that the suspended weight descends to complete releasing, and the steel wire is lifted up to return to the wellhead to complete the seat releasing.

The field use steps of the underground pressure gauge suspension device are as follows: and a simulation tool is adopted to serially connect the drift size gauges to complete drift operation, so that the oil pipe is ensured to be smooth and unobstructed. A coupling positioner 5, a flow guiding tool 4, a pressure gauge supporting cylinder 3, an upward movement prevention tool 2 and a releasing tool 1 are connected on the ground in sequence from bottom to top, the coupling positioner is hoisted to a wellhead after a blowout prevention pipe is arranged, the coupling positioner is stably lowered to a designed depth by a steel wire winch, the coupling positioner is slowly lowered after a spring clamp 503 on the coupling positioner 5 is bounced off by slowly lifting, a second pin is sheared at a coupling of an oil pipe by slight downward shock, a first conical cap 206 supports a supporting claw 202 on the wall of the oil pipe until a first pin 105 of the releasing tool 1 is sheared, and releasing is completed once again.

The coupling locator 5 can be put into the tubing coupling department of design degree of depth in the pit earlier to big inclination well or ultra-deep well with the instrument of going into with prior art, connect diversion tool 4, pressure gauge bearing cylinder 3, prevent moving up instrument 2 and releasing tool 1 again, through releasing tool 1 with diversion tool 4, pressure gauge bearing cylinder 3, prevent moving up instrument 2 and sit on coupling locator 5, avoid big degree of difficulty well condition to cause the well complicacy in the pit.

After the test is finished, the fishing tool string is assembled to a preset position for fishing, and due to various unknown conditions such as large-inclination operation, underground cleaning degree, well condition change after well opening and the like, two-step fishing operation can be realized, and underground accidents are avoided.

The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.

Claims (10)

1. A downhole pressure gauge suspension device is characterized in that: comprises a releasing tool (1), a pressure gauge supporting cylinder (3), a flow guiding tool (4) and a coupling positioner (5) which are connected in sequence; the water conservancy diversion instrument (4) include fourth barrel (401), the both ends of fourth barrel (401) link to each other with top connection (402) and connecting claw (403) respectively, connecting claw (403) include a plurality of claws (404) of circumference distribution on fourth barrel (401), the opposite face epirelief of claw (404) is equipped with claw hook (405), water conservancy diversion hole (406) have been seted up on the lateral wall of fourth barrel (401), the upper concave first helicla flute (407) that is equipped with on fourth barrel (401), the one end of first helicla flute (407) links to each other with water conservancy diversion hole (406), the other end extends to the tip of fourth barrel (401).

2. A downhole pressure gauge suspension as defined in claim 1, wherein: one end of the upper joint (402) in the fourth cylinder (401) is spherical, and the flow guide hole (406) is located on one side of the spherical surface.

3. A downhole pressure gauge suspension as defined in claim 1, wherein: the number of the guide holes (406) is multiple, and each guide hole (406) is connected with one first spiral groove (407).

4. A downhole pressure gauge suspension as defined in claim 1, wherein: the upper joint (402) is in threaded connection with the fourth barrel (401), a boss (408) abutted against the fourth barrel (401) is arranged on the upper joint (402), and a second spiral groove (409) communicated with the first spiral groove (407) is arranged on the boss (408).

5. A downhole pressure gauge suspension as defined in claim 1, wherein: the pressure gauge support cylinder (3) comprises a third cylinder body (301), two ends of the third cylinder body (301) are respectively connected with a first joint (302) and a second joint (303), a first spring seat (304) and a second spring seat (305) are arranged in the third cylinder body (301) in a sliding mode, an upper spring (306) is arranged between the first spring seat (304) and the first joint (302), and a lower spring (307) is arranged between the second spring seat (305) and the second joint (303); an upper circulation hole (308) and a lower circulation hole (309) are formed in the side wall of the third cylinder (301), the upper circulation hole (308) is located on one side of the upper spring (306), and the lower circulation hole (309) is located on one side of the lower spring (307).

6. A downhole pressure gauge suspension as defined in claim 5, wherein: one end, facing the second spring seat (305), of the first spring seat (304) is provided with a first counter bore (310), the other end of the first spring seat (304) is provided with a second counter bore, the first counter bore (310) is communicated with the second counter bore, and the upper spring (306) is installed in the second counter bore.

7. A downhole pressure gauge suspension as defined in claim 5, wherein: one end, facing the first spring seat (304), of the second spring seat (305) is provided with a third counter bore (311), the other end of the second spring seat (305) is provided with a fourth counter bore, the third counter bore (311) is communicated with the fourth counter bore, and the lower spring (307) is installed in the fourth counter bore.

8. A downhole pressure gauge suspension according to any of claims 1-7, wherein: the releasing tool (1) comprises a first barrel (101), a first fishing neck (102) is arranged at one end of the first barrel (101), a sliding block (103) is arranged in the first barrel (101) in a sliding mode, the sliding block (103) is connected with a lower joint (104), a first pin (105) is arranged on the sliding block (103), a strip-shaped hole (106) is formed in the inner wall of the first barrel (101), the first pin (105) is installed in the strip-shaped hole (106) in a sliding mode, and a first spring (107) is arranged between the sliding block (103) and the first fishing neck (102); a guide pin (108) is arranged on the lower joint (104), a slide way (109) is arranged on the inner wall of the first cylinder (101), and the guide pin (108) is slidably arranged in the slide way (109); the slide way (109) comprises a long slide way arranged along the axis of the first cylinder (101) and a short slide way which is obliquely connected with the long slide way.

9. A downhole pressure gauge suspension according to any of claims 1-7, wherein: an anti-moving tool (2) is arranged between the releasing tool (1) and the pressure gauge supporting cylinder (3); the anti-moving-up tool (2) comprises a second cylinder (201), a pair of supporting claws (202) is arranged in the second cylinder (201), the supporting claws (202) are rotatably connected with the second cylinder (201) through rotating pins (203), and a second spring (204) is arranged between the two supporting claws (202); a mandrel (205) is arranged in the second cylinder (201) in a sliding manner, the mandrel (205) is connected with a first conical cap (206), and the first conical cap (206) is in contact with the opposite surfaces of the two support claws (202); the rotating pin (203) is positioned between the second spring (204) and the first conical cap (206); the mandrel (205) and the second cylinder (201) are connected through a second pin.

10. A downhole pressure gauge suspension according to any of claims 1-7, wherein: the coupling locator (5) comprises a mounting seat (501), a pair of elastic claws (502) is arranged on the mounting seat (501), spring clips (503) are arranged on the end portions of the elastic claws (502), a second fishing neck (504) penetrates through the mounting seat (501), and a second taper cap (505) is sleeved on the second fishing neck (504).

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