CN219974455U

CN219974455U - Automatic liquid level controller

Info

Publication number: CN219974455U
Application number: CN202223060831.7U
Authority: CN
Inventors: 梁伟成; 梁闯
Original assignee: Liaoning Xinhua Instruments Co ltd
Current assignee: Liaoning Xinhua Instruments Co ltd
Priority date: 2022-11-18
Filing date: 2022-11-18
Publication date: 2023-11-07
Anticipated expiration: 2032-11-18

Abstract

An automatic liquid level controller belongs to the technical field of oil well production. The hydraulic pressure well head comprises an upper sealing sleeve and a lower sealing sleeve, wherein the upper sealing sleeve is in sealing connection with the lower sealing sleeve after being subjected to the hydraulic pressure, so that an A cavity of an upper joint is isolated from a B cavity of a lower joint, well liquid in the B cavity is not in the A cavity, the B cavity is communicated with a stratum, the liquid level in a well shaft is automatically controlled through the pressure of the stratum, and the problems of artificial pressurizing and splashing are solved.

Description

Automatic liquid level controller

Technical Field

The utility model belongs to the technical field of oil well production, and particularly relates to an automatic liquid level controller.

Background

In the oil well production and well repair process, the production site requirements meet green environmental protection standards, the ecological environment is protected, crude oil cannot be sprayed onto a wellhead, the green environmental protection product becomes an urgent need product for site installation operation, the original production mode cannot well solve the problems, the operation is complex, the reliability and the safety are low, some oil cleaning equipment cannot enter oil well operation with large spraying potential quantity, the wellhead oil stealing and oil stealing phenomenon is common, the conventional blowout prevention tool has limitation on blowout prevention function, or is manually pressed, or an oil pipe is lifted up, and blowout cannot be prevented at any time.

Disclosure of Invention

Aiming at the defects existing in the prior art, the utility model aims to provide an automatic liquid level controller.

The utility model adopts the technical scheme that: the automatic liquid level controller is technically characterized by comprising an upper connecting sleeve and a lower connecting sleeve connected with the upper connecting sleeve, wherein the upper connecting sleeve is connected with an upper joint through a transition sleeve, an upper corrugated pipe assembly is inserted into the transition sleeve and is connected with a lower fixing seat of the lower corrugated pipe assembly through a transition ring, one end of an inner guide sleeve is connected with the upper joint, the other end of the inner guide sleeve is inserted into the upper corrugated pipe assembly to be in a floating state, and an outer guide sleeve for limiting the expansion deformation of a corrugated pipe is inserted into the corrugation of the upper corrugated pipe assembly through a boss on the outer guide sleeve and moves along the inner wall of the upper connecting sleeve along with the upper corrugated pipe assembly;

the upper sealing sleeve is sleeved outside the small corrugated pipe of the lower corrugated pipe assembly and is fixedly connected with the connecting seat of the upper corrugated pipe assembly through threads; the upper sealing sleeve is provided with a contact surface which is tightly pressed and sealed with the end surface of the lower sealing sleeve in the process of sealing and connecting the upper sealing sleeve with the lower sealing sleeve; the lower corrugated pipe assembly is connected with the lower sealing sleeve through the lower fixing seat, and the auxiliary sealing sleeve is sleeved outside the lower sealing sleeve and is fixedly connected with the lower sealing sleeve in a threaded manner; the transmission shaft is inserted into the lower fixing seat of the lower corrugated pipe assembly and is fixedly connected with the central rod; the spring outer cylinder is sleeved outside the transmission shaft and is fixedly connected with a lower fixing seat of the lower corrugated pipe assembly through threads; the spring fixing seat is fixedly connected with the spring outer cylinder through threads; one end of the nitrogen spring is inserted into the spring fixing seat, the other end of the nitrogen spring is contacted with the end surface of the transmission shaft and is tightly pressed, and the lower joint is fixedly connected with the lower connecting sleeve through threads; when the nitrogen spring is compressed under the stress, the upper sealing sleeve is in sealing connection with the lower sealing sleeve, so that the cavity A of the upper joint is isolated from the cavity B of the lower joint, and the cavity B is communicated with the stratum.

In the scheme, a first rubber sealing ring is arranged between the corrugated pipe assembly and the upper connecting sleeve.

In the scheme, a second rubber sealing ring is arranged between the transition sleeve and the upper connecting sleeve.

In the scheme, the nylon sleeve is sleeved on the central rod of the lower corrugated pipe assembly.

In the scheme, a third rubber sealing ring is arranged between the upper sealing sleeve and the connecting seat of the corrugated pipe assembly.

In the scheme, a fourth rubber sealing ring is arranged between the lower sealing sleeve and the auxiliary sealing sleeve.

In the scheme, a fifth rubber sealing ring is arranged between the lower sealing sleeve and the lower fixing seat of the lower corrugated pipe assembly.

In the scheme, a sixth rubber sealing ring is arranged between the upper connecting sleeve and the lower connecting sleeve.

In the scheme, a seventh rubber sealing ring is arranged between the lower fixing seat of the lower corrugated pipe assembly and the spring outer cylinder, and the lower fixing seat of the lower corrugated pipe assembly and the eighth rubber sealing ring of the transmission shaft are arranged.

In the scheme, a ninth rubber sealing ring is arranged between the spring outer cylinder and the spring fixing seat.

The beneficial effects of the utility model are as follows: the automatic liquid level controller comprises an upper sealing sleeve and a lower sealing sleeve, wherein the upper sealing sleeve is in sealing connection with the lower sealing sleeve after being subjected to the action of hydraulic pressure, so that an A cavity of an upper joint is isolated from a B cavity of a lower joint, well liquid in the B cavity does not enter the A cavity, the B cavity is communicated with a stratum, and the liquid level entering a shaft is automatically controlled through the pressure of the stratum, so that the problems of artificial pressurizing and splashing are solved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a liquid level automatic controller according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram showing the use state of the automatic liquid level controller according to the embodiment of the utility model;

the serial numbers in the figure show that the upper joint, the 2 inner guide sleeve, the 3 transition sleeve, the 4 upper corrugated pipe assembly, the 4.1 upper fixing seat, the 4.2 large corrugated pipe, the 4.3 transition ring, the 4.4 connecting seat, the 5 first rubber sealing ring, the 6 second rubber sealing ring, the 7 outer guide sleeve, the 8 spring, the 9 upper connecting sleeve, the 10 lower corrugated pipe assembly, the 10.1 center rod, the 10.2 small corrugated pipe, the 10.3 lower fixing seat, the 11 nylon sleeve, the 12 upper sealing sleeve, the 13 third rubber sealing ring, the 14 lower sealing sleeve, the 15 auxiliary sealing sleeve, the 16 fourth rubber sealing ring, the 17 fifth rubber sealing ring, the 18 sixth rubber sealing ring, the 19 seventh rubber sealing ring, the 20 transmission shaft, the 21 eighth rubber sealing ring, the 22 lower connecting sleeve, the 23 spring fixing seat, the 24 ninth rubber sealing ring, the 25 nitrogen spring, the 26 spring outer cylinder, the 27 tenth rubber sealing ring, the 28 lower joint, the 29 liquid level automatic controller, the 30 releasing packer, the 31, the 32 oil pump, the 33 liquid level, the 34 wellhead, the 35 casing and 36 crude oil.

Description of the embodiments

The foregoing objects, features, and advantages of the utility model will be more readily apparent from the following detailed description of the utility model when taken in conjunction with the accompanying drawings 1 and detailed description.

The liquid level automatic controller adopted in the embodiment comprises an upper connecting sleeve 9 and a lower connecting sleeve 22 connected with the upper connecting sleeve 9, and a sixth rubber sealing ring 18 is arranged between the upper sealing sleeve 12 and the lower sealing sleeve 22 and used for sealing the joint of the upper sealing sleeve and the lower sealing sleeve 22. The upper connecting sleeve 9 is in threaded connection with the transition sleeve 3, and a second rubber sealing ring 6 is arranged between the upper connecting sleeve 9 and the transition sleeve 3 and used for sealing the joint of the upper connecting sleeve 9 and the transition sleeve 3. The transition sleeve 3 is fixedly connected with the upper joint 1 through threads.

The upper corrugated pipe assembly 4 of the embodiment is formed by assembling and welding an upper fixing seat 4.1, a large corrugated pipe 4.2, a transition ring 4.3 and a connecting seat 4.4, the upper corrugated pipe assembly 4 is inserted into the transition sleeve 3 and is in threaded connection with a lower fixing seat of the lower corrugated pipe assembly 10 through the transition ring 4.3, and a first rubber sealing ring 5 is arranged between the upper corrugated pipe assembly 4 and an upper connecting sleeve 9 and used for sealing the joint of the corrugated pipe assembly 4 and the upper connecting sleeve 9. One end of the inner guide sleeve 2 is connected with the upper joint 1, and the other end of the inner guide sleeve is inserted into the upper corrugated pipe assembly 4 to be in a floating state, so that the damage to the corrugated pipe caused by friction between the inner guide sleeve and the corrugated pipe due to concentricity errors caused in the welding process of the upper corrugated pipe assembly 4 can be avoided.

The outer guide sleeve 7 is inserted into the corrugation of the upper corrugated pipe assembly 4 through the boss on the outer guide sleeve 7, and the outer guide sleeve 7 moves along the inner wall of the upper connecting sleeve 9 along with the upper corrugated pipe assembly 4, so that the corrugated pipe is prevented from being excessively deformed outwards due to uneven expansion of the corrugated pipe in bearing pressure, and the corrugated pipe is cracked and failed. The upper sealing sleeve 12 is sleeved outside the small corrugated pipe 10.2 of the lower corrugated pipe assembly 10 and is fixedly connected with the connecting seat 4.4 of the upper corrugated pipe assembly 4 through threads, and a third rubber sealing ring 13 is arranged between the upper sealing sleeve 12 and the connecting seat 4.4 and used for sealing the joint of the upper sealing sleeve 12 and the connecting seat 4.4. The upper sealing sleeve 12 is provided with an end face F which is matched with the contact face E of the lower sealing sleeve 14, and the upper sealing sleeve 12 is sleeved on the rear contact face E of the lower sealing sleeve 14 and is tightly pressed and sealed with the end face F.

The lower corrugated pipe assembly 10 of this embodiment is formed by assembling and welding a central rod 10.1, a small corrugated pipe 10.2 and a lower fixing seat 10.3, wherein the small corrugated pipe 10.2 is sleeved on the outer wall of the central rod 10.1, an air cavity for air to pass in is formed between the two, a C cavity is marked, and the lower fixing seat 10.3 is positioned at the tail part of the central rod 10.1. The nylon sleeve 12 is sleeved on the outer wall of the central rod 10.1 positioned in the C cavity and is used for preventing the small corrugated pipe 10.2 from being damaged and disabled due to overlarge radial deflection generated when the small corrugated pipe is subjected to compression deformation, the supporting and guiding functions are achieved, and two ends of the nylon sleeve 12 are respectively pressed between the convex edges of the central rod 10.1 and the transmission shaft 20 through the springs 8. The lower fixing seat 10.3 of the lower corrugated pipe assembly 10 is connected with the lower sealing sleeve 14 through threads, the auxiliary sealing sleeve 15 is sleeved outside the lower sealing sleeve 14 and is fixedly connected with the lower sealing sleeve 14 in a threaded manner, and a fourth rubber sealing ring 16 is arranged between the lower sealing sleeve 14 and the auxiliary sealing sleeve 15 and used for sealing the joint of the lower sealing sleeve 14 and the auxiliary sealing sleeve 15. A fifth rubber sealing ring 17 is arranged between the lower sealing sleeve 14 and the lower fixing seat 10.3 of the lower corrugated pipe assembly 10, and the joint of the lower sealing sleeve 14 and the lower fixing seat 10.3 is sealed. One end of the transmission shaft 20 is inserted into the lower fixing seat 10.3 of the lower bellows assembly 10 and is fixed with the central rod 10.1 by screw connection. The spring outer cylinder 26 is sleeved outside the transmission shaft 20 and is fixedly connected with the lower fixing seat 10.3 of the lower corrugated pipe assembly through threads, and a seventh rubber sealing ring 19 is arranged between the lower fixing seat 10.3 and the spring outer cylinder 26 and used for sealing the joint of the lower fixing seat 10.3 and the spring outer cylinder 26. The spring fixing seat 23 is fixedly connected with the spring outer cylinder 26 through threads. One end of a nitrogen spring 25 is inserted into the spring fixing seat 23, the other end of the nitrogen spring is contacted with the end face of the transmission shaft 20 and is pressed, an eighth rubber sealing ring 21 is arranged between the lower fixing seat 10.3 of the lower corrugated pipe assembly 10 and the transmission shaft 20 and is used for sealing the joint of the lower fixing seat 10.3 and the transmission shaft 20, and a ninth rubber sealing ring 24 is arranged between the spring outer cylinder 26 and the spring fixing seat 23 and is used for sealing the joint of the spring outer cylinder 26 and the spring fixing seat 23.

The lower joint 28 is fixedly connected with the lower connecting sleeve 22 through threads, and a tenth rubber sealing ring 27 is arranged between the lower connecting sleeve 22 and the lower joint 28 and used for sealing the joint of the lower connecting sleeve 22 and the lower joint 28. The cavity A of the upper joint and the cavity B of the lower joint are communicated to form a communicating cavity for oil to pass through when the nitrogen spring 25 is in a normal state, and the upper sealing sleeve is in sealing connection with the lower sealing sleeve 14 when the nitrogen spring 25 is stressed and compressed, so that the cavity A of the upper joint and the cavity B of the lower joint are isolated, the cavity B is communicated with a stratum, and the control of the stratum liquid outlet quantity is realized.

The working principle of the liquid level automatic controller in the embodiment is as follows:

automatically controlling the liquid level in the well bore: after the automatic liquid level controller is installed and released in the shaft according to the schematic diagram, because the cavity C is an air cavity, well liquid exists in the shaft, the nitrogen spring 25 can be compressed under the action of pressure formed by a liquid column (liquid column pressure P=ρgh), meanwhile, the transition ring 4.3, the connecting seat 4.4 and the upper sealing sleeve 12 in the upper corrugated pipe assembly 4 can be driven to move together, when the pressure generated by the liquid column (finally converted into the height of the liquid column) reaches the set value of the nitrogen spring 25, the cavity A and the cavity B can be contacted and isolated, so that the well liquid in the cavity B does not enter the cavity A, and the cavity B is communicated with a stratum, the liquid outlet amount of the stratum is controlled, and meanwhile, the liquid level in the shaft cannot reach a wellhead, so that the effect of preventing blowout is achieved, and the effect of preventing oil theft is also achieved. The oil pumping equipment can make liquid level decline gradually with the well liquid in the pit shaft discharge in-process, when liquid level decline to the pressure that produces be less than the settlement power of nitrogen spring, E, F will separate thereby open the passageway of A chamber and B chamber, and the well liquid of B chamber enters into A chamber, makes the liquid level rise gradually, when reaching certain height, can make E, F contact closed channel again, so the circulation will be with the automatic control of liquid level in the pit shaft on certain height.

The automatic liquid level controller of the embodiment is specifically applied to an oil well as follows: the upper part of the liquid level automatic controller 29 is connected with a releasing packer 30, the upper part of the releasing packer 30 is connected with a screen pipe 31, and the whole device is lowered into a designated depth along with an oil pipe. The releasing packer 30 seals the sleeve 35 and plays a role in anchoring the whole device, and the pressure entering the upper part of the releasing packer 30 is controlled by presetting an initial pressure value of a liquid level automatic controller, so that the liquid level height of an oil well is controlled, and the liquid level 33 is always at a certain distance from the wellhead 34, thereby achieving the purpose of blowout prevention. During normal oil recovery operation, the oil pump 32 (pump or screw pump) is controlled to produce oil level 33 within a reasonable range, and the automatic level controller 29 is in a normally open state. When oil production is stopped, after the liquid level 33 rises to a certain height, the pressure at the liquid level automatic controller 29 is increased, and after the pressure reaches a set pressure value, an internal switch is closed, so that crude oil 36 in the stratum does not enter the upper part of the releasing packer 30, the liquid level in a shaft is not raised and is maintained at a certain height from an inlet, the liquid level cannot reach a wellhead, and therefore, the phenomenon that oil jackets are prevented from being sprayed during operation and crude oil is stolen during normal production can be prevented.

The automatic liquid level controller in the embodiment can also improve the well flushing efficiency, the well flushing liquid is backwashed when the well is flushed in normal production, namely the well flushing liquid is discharged from the casing oil inlet pipe, and the well flushing liquid is easily injected into the stratum when the well flushing liquid is flushed because the pressure of the well flushing liquid is slightly higher than the stratum pressure in the well flushing process, so that the stratum can be polluted, the well flushing liquid is wasted, and the production efficiency and the economic benefit are reduced. When the product is installed underground, E, F is contacted because the height of the liquid column exceeds the set force of the spring in the well flushing process, and the liquid in the cavity A cannot enter the cavity B, namely cannot enter the stratum, so that the stratum is protected from being polluted, and the well flushing liquid can only return to the ground through an oil pipe, so that the well flushing efficiency is improved.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. The automatic liquid level controller is characterized by comprising an upper connecting sleeve (9) and a lower connecting sleeve (22) connected with the upper connecting sleeve (9), wherein the upper connecting sleeve (9) is connected with an upper joint (1) through a transition sleeve (3), an upper corrugated pipe assembly (4) is inserted into the transition sleeve (3) and is connected with a lower fixing seat (10.3) of a lower corrugated pipe assembly (10) through a transition ring (4.3), one end of an inner guide sleeve (2) is connected with the upper joint (1), the other end of the inner guide sleeve is inserted into the upper corrugated pipe assembly (4) to be in a floating state, and an outer guide sleeve (7) for limiting the expansion deformation of a corrugated pipe is inserted into the corrugated pipe of the upper corrugated pipe assembly (4) through a boss on the outer guide sleeve and moves along the inner wall of the upper corrugated pipe assembly (4) along with the inner wall of the upper connecting sleeve (9);

the upper sealing sleeve (12) is sleeved outside the small corrugated pipe (10.2) of the lower corrugated pipe assembly (10) and is fixedly connected with the connecting seat 4.4 of the upper corrugated pipe assembly (4) through threads; the upper sealing sleeve (12) is provided with a contact surface (E) which is tightly pressed and sealed with the end surface (F) of the lower sealing sleeve (14) in the process of sealing and connecting the upper sealing sleeve (12) with the lower sealing sleeve (14); the lower corrugated pipe assembly (10) is connected with the lower sealing sleeve (14) through a lower fixing seat (10.3), and the auxiliary sealing sleeve (15) is sleeved outside the lower sealing sleeve (14) and is fixedly connected with the lower sealing sleeve (14) in a threaded manner; the transmission shaft (20) is inserted into a lower fixing seat (10.3) of the lower corrugated pipe assembly (10) and is fixedly connected with the central rod (10.1); the spring outer cylinder (26) is sleeved outside the transmission shaft (20) and is fixedly connected with a lower fixing seat (10.3) of the lower corrugated pipe assembly through threads; the spring fixing seat (23) is fixedly connected with the spring outer cylinder (26) through threads; one end of a nitrogen spring (25) is inserted into the spring fixing seat (23), the other end of the nitrogen spring is contacted with the end face of the transmission shaft (20) and is pressed, and a lower joint (28) is fixedly connected with the lower connecting sleeve (22) through threads; the cavity A of the upper joint and the cavity B of the lower joint are communicated to form a communicating cavity for oil to pass through when the nitrogen spring (25) is in a normal state, and the upper sealing sleeve is in sealing connection with the lower sealing sleeve (14) when the nitrogen spring (25) is stressed and compressed, so that the cavity A of the upper joint is isolated from the cavity B of the lower joint, and the cavity B is communicated with a stratum.

2. An automatic liquid level controller according to claim 1, characterized in that a first rubber sealing ring (5) is arranged between the bellows assembly (4) and the upper connecting sleeve (9).

3. An automatic liquid level controller according to claim 1, characterized in that a second rubber sealing ring (6) is arranged between the transition sleeve (3) and the upper connecting sleeve (9).

4. Automatic level controller according to claim 1, characterized in that a nylon sleeve (11) is sleeved on the central rod (10.1) of the lower bellows assembly (10).

5. An automatic level controller according to claim 1, characterized in that a third rubber sealing ring (13) is provided between the upper sealing sleeve (12) and the connection seat (4.4) of the bellows assembly (4).

6. An automatic level controller according to claim 1, characterized in that a fourth rubber sealing ring (16) is arranged between the lower sealing sleeve (14) and the auxiliary sealing sleeve (15).

7. An automatic level controller according to claim 1, characterized in that a fifth rubber sealing ring (17) is arranged between the lower sealing sleeve (14) and the lower fixing seat (10.3) of the lower bellows assembly (10).

8. Automatic level controller according to claim 1, characterized in that a sixth rubber sealing ring (18) is arranged between the upper (9) and lower (22) connection sleeves.

9. The automatic liquid level controller according to claim 1, wherein a seventh rubber seal ring (19) is provided between the lower fixing seat (10.3) of the lower bellows assembly (10) and the spring outer cylinder (26), and the lower fixing seat (10.3) of the lower bellows assembly (10) and the eighth rubber seal ring (21) of the transmission shaft (20).

10. The automatic liquid level controller according to claim 1, characterized in that a ninth rubber sealing ring (24) is arranged between the spring outer cylinder (26) and the spring fixing seat (23).