CN211287619U

CN211287619U - Electric pressure relief device for sealing section

Info

Publication number: CN211287619U
Application number: CN201922208103.8U
Authority: CN
Inventors: 冯贵洪; 王守舵
Original assignee: Guizhou Aerospace Kaishan Petroleum Instrument Co Ltd
Current assignee: Guizhou Aerospace Kaishan Petroleum Instrument Co Ltd
Priority date: 2019-12-11
Filing date: 2019-12-11
Publication date: 2020-08-18
Anticipated expiration: 2029-12-11

Abstract

The utility model discloses an electric pressure relief device for a sealing section, which comprises a body (14), wherein a transmission screw (9) connected with a motor is arranged in the body (14); external threads with opposite rotation directions are arranged at the two ends of the transmission screw rod (9); an upper nut (10) is screwed at the upper end of the transmission screw rod (9), and a lower nut (7) is screwed at the lower end; the side surfaces of the upper nut (10) and the lower nut (7) are provided with screws (11), and one ends of the screws (11) are positioned in the side holes of the lower push cylinder (13) and the upper push cylinder (12); the lower end of the upper push cylinder (12) is connected with the upper end of the upper leather cup (2), and the upper end of the lower push cylinder (13) is connected with the lower end of the lower leather cup (4); the lower nut (7) is connected with the pressure relief valve core (5); the pressure relief valve core (5) is positioned in a sealing section inner hole (18) in the body (14). The utility model discloses can avoid the leather cup to damage, improve the test work security.

Description

Electric pressure relief device for sealing section

Technical Field

The utility model relates to an electronic pressure relief device of sealed section belongs to oil field instrument technical field in the pit.

Background

In the underground of an oil field, an electric sealing section is often adopted to complete the works of formation pressure testing, sampling, packer seal checking and the like. The motor is controlled to rotate, and the sealing elements such as the leather cup and the like are driven to bulge and deform through the transmission device, so that the test pore channel is sealed. In the test process, along with the rising of pressure between the leather cups, lead to the leather cup both sides to form great pressure differential, only can't realize the pressure release through the reversal motor, lead to the instrument to lift safe risk increase, very easily cause the instrument to drop, card well incident, especially deep well, the well that the pressure differential is big.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electronic pressure relief device of sealed section to reduce the instrument and lift safe risk, prevent to cause the emergence that the instrument dropped, the incident such as stuck in the well, thereby overcome the not enough of prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model relates to an electric pressure relief device for a sealing section, which comprises a body, wherein a transmission screw rod connected with a motor is arranged in the body; external threads with opposite rotation directions are arranged at the two ends of the transmission screw rod; the upper end of the transmission screw is screwed with an upper nut, and the lower end of the transmission screw is screwed with a lower nut; the side surfaces of the upper nut and the lower nut are provided with screws, and one ends of the screws are positioned in the side holes of the lower push cylinder and the upper push cylinder; the lower end of the upper push cylinder is connected with the upper end of the upper leather cup, and the upper end of the lower push cylinder is connected with the lower end of the lower leather cup; the lower nut is connected with the pressure relief valve core; the pressure relief valve core is positioned in the sealing section inner hole in the body.

In the electric pressure relief device for the sealing section, the lower push cylinder, the upper leather cup and the lower leather cup are positioned on the outer circular surface of the body.

In the electric pressure relief device for the sealing section, a pressure transmission pipe is arranged on one side in the body; the pressure transmitting pipe is communicated with the formation pressure hole.

In the electric pressure relief device with the sealing section, the section of one end of the pressure relief valve core is a cylindrical section; a sealing groove and a nut groove are formed in the cylindrical section of the pressure relief valve core; a sealing ring is arranged in the sealing groove; the lower nut is clamped in the nut groove; the other end of the pressure relief valve core is a cross-shaped cross section to form a group of drainage grooves.

In the electric pressure relief device for the sealing section, unloading grooves are formed in the periphery of an inner hole of the sealing section.

By adopting the technical scheme, the pressure relief valve core of the utility model is provided with the sealing ring, the drainage groove and other structures, and the inner hole of the sealing section is provided with the unloading groove structure, so that the smooth movement of the pressure relief valve core and the normal pressure relief function can be ensured, and the sealing ring is prevented from being extruded and damaged by the pressure difference effect to cause the operation failure; the electric pressure relief function of the utility model recovers the leather cup in a pressure balanced state, thereby avoiding the damage of the leather cup, reducing the accidents of well falling and well blocking and greatly improving the safety of testing work; is especially suitable for deep wells and wells with large pressure difference, and expands the application field of instruments. The utility model is suitable for an at the electronic pressure release structure of sealed section for the oil field downhole tester, also be applicable to other electronic pressure release structures that need realize pressure balance and reduce motor load or deblocking power.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic diagram of the relief valve cartridge;

fig. 3 is a sectional view a-a of fig. 1.

In the drawings are labeled: 1-pressure transmission pipe, 2-upper leather cup, 3-stratum pressure hole and 4-lower leather cup

5-a pressure relief valve core, 6-an oil pipe pressure hole, 7-a lower nut, 8-a sealing ring, 9-a transmission screw, 10-an upper nut, 11-a screw, 12-an upper push cylinder, 13-a lower push cylinder, 14-a body, 15-a sealing groove, 16-a nut groove, 17-a drainage groove, 18-a sealing section inner hole and 19-an unloading groove.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

The utility model is formed according to the following electric pressure relief method of the sealing section, as shown in figures 1 to 3, the screw thread directions at two ends of a drive screw 9 in the method are mutually reverse; the lower end of the transmission screw 9 is provided with a lower nut 7, and the upper end is provided with an upper nut 10; when the motor drives the transmission screw rod 9 to rotate forward, the lower nut 7 drives the lower push cylinder 13 to move upwards through the screw 11, and the lower end of the lower push cylinder extrudes the lower leather cup 4 upwards; meanwhile, the upper nut 10 drives the upper push cylinder 12 to move downwards through the screw 11, and the upper leather cup 2 is pressed downwards from the upper end; the middle parts of the upper leather cup and the lower leather cup are deformed and expanded, so that sealing is formed between the upper leather cup and the lower leather cup and an inner hole of the downhole tool; the lower nut 7 drives the pressure relief valve core 5 to move upwards while moving upwards, and when a sealing ring 8 on the pressure relief valve core 5 enters a sealing section sealing inner hole, the stratum pressure hole 3 is sealed and isolated from the oil pipe pressure hole 6, so that the layering test or the seal checking function of the stratum pressure and the oil pipe pressure is realized. When the motor drives the transmission screw 9 to rotate reversely, the lower nut 7 drives the lower push cylinder 13 to move downwards through the screw 11, and the lower leather cup 4 is stretched downwards from the lower end; meanwhile, the upper nut 10 drives the upper push cylinder 12 to move upwards through the screw 11, and the upper leather cup 2 is stretched upwards from the upper end, so that the middle parts of the upper leather cup and the lower leather cup are leveled and the sealing is removed; the lower nut 7 drives the pressure relief valve core 5 to move downwards while moving downwards, so that the formation pressure hole 3 is communicated with the oil pipe pressure hole 6, and pressure balance is realized.

The electric pressure relief device for the sealing section of the utility model, which is formed according to the method and is used for the method, as shown in fig. 1-3, comprises a body 14, wherein a transmission screw 9 connected with a motor is arranged in the body 14; external threads with opposite rotation directions are arranged at two ends of the transmission screw rod 9; the upper end of the transmission screw 9 is screwed with an upper nut 10, and the lower end is screwed with a lower nut 7; the side surfaces of the upper nut 10 and the lower nut 7 are provided with screws 11, and one ends of the screws 11 are positioned in the side holes of the lower push cylinder 13 and the upper push cylinder 12; the lower end of the upper push cylinder 12 is connected with the upper end of the upper leather cup 2, and the upper end of the lower push cylinder 13 is connected with the lower end of the lower leather cup 4; the lower nut 7 is connected with the pressure relief valve core 5; the pressure relief valve spool 5 is located in a seal section bore 18 in the body 14. The lower push cylinder 13, the upper push cylinder 12, the upper leather cup 2 and the lower leather cup 4 are positioned on the outer circular surface of the body 14. A pressure transmission pipe 1 is arranged at one side in the body 14; the pressure transfer pipe 1 is communicated with a formation pressure hole 3. The section of one end of the pressure relief valve core 5 is a cylindrical section; a sealing groove 15 and a nut groove 16 are arranged on the cylindrical section of the pressure relief valve core 5; a sealing ring 8 is arranged in the sealing groove; the lower nut 7 is clamped in the nut groove; the other end of the pressure relief valve core 5 is a cross-shaped cross section to form a group of drainage grooves 17. And unloading grooves 19 are formed around the inner hole 18 of the sealing section.

Examples

The electric pressure relief method and device for the sealing section of the present embodiment are shown in fig. 1 to 3. One end of the pressure transmission pipe 1 is connected with a pressure sensor of an instrument host, and the other end of the pressure transmission pipe is communicated with a formation pressure hole 3 through a small hole in the sealing section and is used for transmitting the formation pressure; the thread directions of the two ends of the transmission screw are opposite, the motor drives the transmission screw 9 to rotate, and the lower nut 7 and the upper nut 10 move oppositely; the lower nut 7 and the upper nut 10 are connected with the upper push cylinder 12 and the lower push cylinder 13 through screws 11, the tooth-shaped protrusions at the front ends of the upper push cylinder 12 and the lower push cylinder 13 are embedded with the upper leather cup 2 and the lower leather cup 4, the motor rotates to drive the upper push cylinder 12 and the lower push cylinder 13 to extrude the upper leather cup 2 and the lower leather cup 4 from the upper end and the lower end, the middle of each leather cup deforms and expands, and accordingly sealing is formed between the upper leather cup and an inner hole of a downhole tool (such as a water distributor), the lower nut 7 simultaneously drives the pressure relief valve core 5 to move upwards, when a sealing ring 8 on the pressure relief valve core 5 enters a sealing section sealing inner hole 18, a stratum pressure hole 3 is sealed and isolated from an oil pipe pressure hole 6, and the instrument achieves the layering test or seal; when pressure is relieved, the lower nut 7 and the upper nut 10 move backwards by controlling the motor to rotate reversely, and the upper leather cup 2 and the lower leather cup 4 are pulled by the upper push cylinder 12 and the lower push cylinder 13 from the upper end and the lower end; the lower nut 7 simultaneously drives the pressure relief valve core 5 to move downwards, so that the formation pressure hole 3 is communicated with the oil pipe pressure hole 6, and pressure balance is realized.

Under the condition that the pressure difference exists, the force required for pulling the pressure relief valve core 5 is far less than the force for pulling the leather cup, so that the influence on the load capacity of the motor is small. The leather cup is recovered under a pressure balance state, the load of the motor is small, and the leather cup is not easy to damage; a drainage groove 17 (shown in figure 2) is processed at the front end of the pressure relief valve core 5, so that the pressure relief valve core 5 is ensured to be centered and guided in an inner hole of the sealing section, and a sufficient overflowing pressure relief effect can be ensured; an unloading groove 19 (shown in figure 3) with the width of 0.5mm is processed at the opening part of the inner hole 18 of the sealing section matched with the pressure relief valve core 5, so that the sealing ring 8 is prevented from being extruded and damaged under the action of pressure difference, and the operation failures such as pressure test, seal inspection and the like are avoided.

The utility model has the characteristics of it is following:

the pressure relief valve core is provided with a sealing ring, a drainage groove and other structures, and an unloading groove structure is processed on an inner hole of the sealing section, so that smooth movement of the pressure relief valve core and normal pressure relief function can be ensured, and the sealing ring is prevented from being extruded and damaged by the action of pressure difference to cause operation failure; the device has an electric pressure relief function, and the leather cup is recovered in a pressure balanced state, so that the leather cup can be prevented from being damaged, the safety accidents of well falling and well clamping are reduced, and the safety of testing work is greatly improved; is especially suitable for deep wells and wells with large pressure difference, and expands the application field of instruments. The utility model is suitable for an at the electronic pressure release structure of sealed section for the oil field downhole tester, also be applicable to other electronic pressure release structures that need realize pressure balance and reduce motor load or deblocking power.

Claims

1. An electronic pressure relief device of sealed section, includes body (14), its characterized in that: a transmission screw (9) connected with a motor is arranged in the body (14); external threads with opposite rotation directions are arranged at the two ends of the transmission screw rod (9); an upper nut (10) is screwed at the upper end of the transmission screw rod (9), and a lower nut (7) is screwed at the lower end; the side surfaces of the upper nut (10) and the lower nut (7) are provided with screws (11), and one ends of the screws (11) are positioned in the side holes of the lower push cylinder (13) and the upper push cylinder (12); the lower end of the upper push cylinder (12) is connected with the upper end of the upper leather cup (2), and the upper end of the lower push cylinder (13) is connected with the lower end of the lower leather cup (4); the lower nut (7) is connected with the pressure relief valve core (5); the pressure relief valve core (5) is positioned in a sealing section inner hole (18) in the body (14).

2. The seal segment electrical pressure relief device of claim 1, wherein: the lower push cylinder (13), the upper push cylinder (12), the upper leather bowl (2) and the lower leather bowl (4) are positioned on the outer circular surface of the body (14).

3. The seal segment electrical pressure relief device of claim 1, wherein: a pressure transmission pipe (1) is arranged on one side in the body (14); the pressure transmission pipe (1) is communicated with the formation pressure hole (3).

4. The seal segment electrical pressure relief device of claim 1, wherein: the section of one end of the pressure relief valve core (5) is a cylindrical section; a sealing groove (15) and a nut groove (16) are arranged on the cylindrical section of the pressure relief valve core (5); a sealing ring (8) is arranged in the sealing groove; the lower nut (7) is clamped in the nut groove; the other end of the pressure relief valve core (5) is cross-shaped in cross section to form a group of drainage grooves (17).

5. The seal segment electrical pressure relief device of claim 1, wherein: unloading grooves (19) are formed in the periphery of the inner hole (18) of the sealing section.