CN204646186U - One can setting type underground check valve - Google Patents

Abstract

The utility model relates to a seatable downhole check valve, which comprises a sand filter pipe, a check valve, a clasp, a connecting pipe, an outer sleeve, a spring seat, a setting spring, a reset spring retainer, a connecting cylinder, and a sealing ring. , ferrule, sealing cup, slips, center tube, outer sleeve, shear pin, delivery joint, delivery joint is connected with outer sleeve through shear pin, center tube is connected with connecting pipe, sealing cup is connected with Outer sleeve and ferrule connection, ferrule and outer sleeve, connecting sleeve and outer sleeve connection, sealing ring seal outer sleeve and connecting pipe, connecting sleeve and connecting pipe, outer sleeve, spring seat, ferrule and outer sleeve Connection, the return spring circlip is connected with the connecting cylinder and the connecting pipe, the setting spring is in the spring seat, the check valve is connected with the sand filter pipe, the sand filter pipe is connected with the check valve, snap ring and the connecting pipe, beneficial effect: structure Simple, easy to install, good sealing, high pressure difference resistance, and can be installed and unsealed at any position underground.

Description

A settable downhole check valve

technical field

The utility model relates to a settable downhole check valve, in particular to a check valve capable of controlling one-way flow at any position underground and capable of setting and unsealing at any position in a pipe string.

Background technique

In the development of oil and gas fields, in self-flowing wells or gas well production wells, downhole crude oil continuously rushes to the ground, and crude oil (natural gas) needs to pass through oil pipes or casings. The operation and management areas have installed check valves on single well pipelines to prevent oil and gas backflow, which may cause major safety accidents. The installation methods and positions of check valves are basically: clamp connection, flange connection, welding welding In the single well process, the position of the check valve is fixed and cannot be changed arbitrarily. Due to the well deviation, the centralizer on the sucker rod and the tubing rub against each other to produce friction and wax blocks to flow through the check valve with the downhole fluid. When the check valve is prone to clogging, we must use electric welding, fire trucks, oil production maintenance team and relevant safety personnel to cooperate to disassemble the check valve. Because the connection of the check valve is severely corroded during use, the thread is stuck. Unable to unload extended well shutdown time, and invested a lot of manpower, material resources and cost expenditure at the same time, too long maintenance time reduces the operating time of the oil well, which has seriously affected the normal production of the oil well. Therefore, after careful research and discussion, we have redesigned a check valve that can be set at any position in the well and can be unsealed at any time. It is easy to install and operate. This check valve solves this problem at one time. The problem is that the check valve can be installed in any position of the oil pipe or casing, and it can be easily unsealed to remove the check valve, which is convenient to reduce maintenance costs, ensure the smooth flow of oil and gas in the pipeline, and enable better and safer production. Reduce risk and meet safety requirements.

Contents of the invention

The utility model mainly aims at the above problems, and provides a check valve that can be installed at any position in the oil pipe or casing, and can be released at any time. The check valve has a simple structure, reliable operation, and can effectively prevent backflow.

In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is as follows: including sand filter pipe, check valve, snap ring, connecting pipe, outer sleeve, spring seat, setting spring, return spring circlip, connecting cylinder, sealing ring, snap ring sleeve, sealing cup, slips, center pipe, outer sleeve, shear pin, delivery joint, the delivery joint is connected with the outer sleeve through the shear pin, and the central pipe is connected with the connecting pipe, The sealing cup is connected with the outer sleeve and the ferrule, the ferrule is connected with the outer sleeve, the connecting sleeve and the outer sleeve, the sealing ring seals the outer sleeve and the connecting pipe, and the connecting sleeve and the connecting pipe , the outer sleeve, the spring seat, the ferrule and the outer sleeve are connected, the return spring circlip is connected with the connecting tube and the connecting tube, the setting spring is in the spring seat, and the spring seat is connected with the connecting tube and the connecting tube , the outer sleeve is connected with the clasp, the connecting sleeve and the ferrule, the connecting pipe is connected with the clasp, the spring seat, the connecting sleeve, the outer sleeve and the central pipe, and the clasp is connected with the sand filter pipe and The connecting pipe is connected, the check valve is connected with the sand filter pipe, and the sand filter pipe is connected with the check valve, snap ring and connecting pipe.

On the basis of the above technical solution, a settable downhole check valve is provided, and the check valve is connected with a sand filter pipe.

On the basis of the above technical solution, a settable downhole check valve is provided. The sealing cup is composed of an upper cup and a lower cup, and a spring clip groove is designed at the position of the upper cup.

The check valve has a simple structure, is easy to install, has good sealing and high pressure difference resistance, and can be installed and unsealed at any position in the well, and plays the role of one-way flow.

Description of drawings

Fig. 1: structural representation of the utility model;

Fig. 2: partial schematic diagram of the utility model;

Fig. 3: partial schematic diagram of the utility model;

Fig. 4: partial schematic diagram of the utility model;

Symbol Description:

1. Sand filter pipe, 2. Check valve, 3. Snap ring, 4. Connecting pipe, 5. Outer casing, 6. Spring seat, 7. Setting spring, 8. Reset spring circlip, 9. Connecting cylinder, 10. Sealing ring, 11. Ferrule, 12. Sealing cup, 13. Slips, 14. Center tube, 15. Outer sleeve, 16. Shear pin, 17. Delivery joint. the

a upper leather cup b lower leather cup c spring clip groove. the

Detailed ways

Below in conjunction with accompanying drawing and example the utility model is described further:

As shown in Figure 1-4, a settable downhole check valve includes: sand filter pipe (1), check valve (2), snap ring (3), connecting pipe (4), outer sleeve (5) ), spring seat (6), setting spring (7), return spring circlip (8), connecting cylinder (9), sealing ring (10), ferrule (11), sealing cup (12), slips (13), center pipe (14), outer sleeve (15), shear pin (16), delivery joint (17), delivery joint (17) passes through shear pin (16) and outer sleeve (15) ), connect the delivery joint (17) with a well test steel wire, lower the settable check valve to the design depth, and then lift it up, and the slips (13) will open under the action of their own weight, so that the slips (13) and The oil pipe inner wall is clamped tightly, and now the outer sleeve (15) is blocked simultaneously. Continue to lift the steel wire, the shearing pin (16) is cut off under the action of the lifting force, at this time the center pipe (14) and the connecting pipe (4) move upward without force on the upper part, and the setting spring (7) releases , through the clasp (3) to push the outer sleeve (5) upward, so that the sealing cup (12) is opened, and after the steel wire is pulled out, the well can be opened for production. The high-pressure gas (liquid) in the well passes through the sand filter pipe (1) in the restrictor to filter out the sand, and then passes through the check valve (2). At the same time, under the action of the gas pressure difference in the well, the setting of the restrictor is more reliable. When fishing, the special fishing tool is first connected to the tool string composed of the jar and the weighted rod, and then the tool string is lowered into the well. After reaching the position, the fishing tool is docked with the fishing head on the outer sleeve (15), When the overshot is docked with the throttle, press down the center pipe (14) on the throttle to reset the setting spring (7), and then lift it up quickly so that the slips (13) of the throttle are on the jar Unlock the card under the vibration effect. After the card is released, the steel wire can be lifted up to salvage the restrictor to the wellhead to complete the salvage work of the restrictor.

Preferably, the settable downhole check valve is characterized in that the check valve (2) is connected to the sand filter pipe (1).

Preferably, the settable downhole check valve is characterized in that: the sealing cup (12) is composed of an upper cup (a) and a lower cup (b), and at the position of the upper cup (a) The spring clip slot (c) is designed.

After careful research and discussion, the utility model redesigns a single-flow valve that can be set and sealed at any position underground, and can be unsealed at any time, which is easy to install and operate. The problem is that the check valve can be installed at any position on the oil pipe or casing, and it can be easily unsealed to remove the check valve, which is convenient to reduce maintenance costs, ensure the smooth flow of oil and gas in the pipeline, and enable better and safer production. Reduce risk and meet safety requirements.

The utility model has been described above with examples, but the utility model is not limited to the above-mentioned specific embodiments, and any changes or modifications made based on the utility model all belong to the protection scope of the utility model.

Claims (3)

1. A settable downhole check valve is characterized in that: it comprises a sand filter pipe (1), a check valve (2), a snap ring (3), a connecting pipe (4), an outer casing (5), Spring seat (6), setting spring (7), return spring circlip (8), connecting cylinder (9), sealing ring (10), ferrule (11), sealing cup (12), slips (13 ), central tube (14), outer sleeve (15), shear pin (16), delivery joint (17), and described delivery joint (17) is connected with outer sleeve ( 15) connection, the central pipe (14) is connected with the connecting pipe (4), the sealing cup (12) is connected with the outer sleeve (15) and the ferrule (11), and the ferrule (11) is connected with the ferrule (11) The outer sleeve (15), the connecting sleeve (9) and the outer sleeve (5) are connected, the sealing ring (10) seals the outer sleeve (15) and the connecting pipe (4), and the connecting sleeve (9) It is connected with connecting pipe (4), outer sleeve (5), spring seat (6), ferrule (11) and outer sleeve (15), and the return spring circlip (8) is connected with connecting sleeve (9) and The connecting pipe (4) is connected, the setting spring (7) is in the spring seat (6), the spring seat (6) is connected with the connecting pipe (4) and the connecting cylinder (9), and the outer casing (5 ) is connected with snap ring (3), connecting cylinder (9) and ferrule (11), and the connecting pipe (4) is connected with snap ring (3), spring seat (6), connecting cylinder (9), outer jacket The cylinder (15) is connected with the central pipe (14), the snap ring (3) is connected with the sand filter pipe (1) and the connecting pipe (4), and the check valve (2) is connected with the sand filter pipe (1) ) connection, the sand filter pipe (1) is connected with the check valve (2), snap ring (3) and connecting pipe (4). 2. A settable downhole check valve according to claim 1, characterized in that the check valve (2) is connected to the sand filter pipe (1). 3. A settable downhole check valve according to claim 1, characterized in that: the sealing cup (12) is composed of an upper cup (a) and a lower cup (b), and the upper cup (a) ) is designed with a spring clip slot (c).