CN217558289U

CN217558289U - Well head device for repairing coal bed gas micro-strip pressure well

Info

Publication number: CN217558289U
Application number: CN202122547372.4U
Authority: CN
Inventors: 邵小平; 蒋永平; 刘波; 姚荣昌; 崔彬; 谢昕翰; 任立昌; 詹俊
Original assignee: China Petroleum and Chemical Corp; Sinopec East China Oil and Gas Co
Current assignee: China Petroleum and Chemical Corp; Sinopec East China Oil and Gas Co
Priority date: 2021-10-22
Filing date: 2021-10-22
Publication date: 2022-10-11
Anticipated expiration: 2031-10-22

Abstract

The utility model discloses a well head device is repaiied to coal bed gas microstrip pressure, concretely relates to well repair equipment technical field, including the casing with the inside oil duct that sets up of casing, be provided with oil pipe in the oil duct, be provided with gas child rubber core in the casing, the outside lateral wall of gas child rubber core is equipped with the annular groove, the annular groove with form annular space between the inboard lateral wall of casing, the top of casing is connected with the high pressure and proclaims oneself, the outside of casing be equipped with an outer interface of annular space intercommunication and with No. two outer interfaces of oil duct intercommunication. The utility model discloses can solve the low difficult problem of high yield well operation factor of safety, greatly reduced the danger of operation workman well head operation, and this device part is few, and is with low costs.

Description

Well head device for repairing coal bed gas micro-strip pressure well

Technical Field

The utility model relates to a well workover equipment technical field, more specifically say, the utility model relates to a well head is repaiied to coal bed gas microstrip pressure.

Background

The operation of detecting the pump in the coal bed gas field is large, and needs to be operated under pressure, and the operation under pressure refers to the underground operation technology which utilizes special well repairing equipment to implement the measures of pulling up and pulling down the tubular column, repairing the shaft and increasing the yield under the condition that the wellhead of an oil well, a gas well and a water well is under pressure, the annular pressure of an oil sleeve is controlled through a wellhead blowout preventer group, the internal pressure of the oil pipe is controlled by a blanking plug, and then the internal jacking force in the well is overcome by applying external force to the tubular column, so that the pulling up and pulling down of the tubular column under pressure is completed. Because of the low coal bed gas development benefit, investment cost control is strict, and conventional oil gas well area presses operation device equipment expensive, the investment is high, and use cost is high, is applicable to highly compressed conventional oil gas well operation, and during conventional gas well operation well, the gas overflow volume is big, has the safety risk.

Disclosure of Invention

In order to overcome the above-mentioned defect of prior art, the embodiment of the utility model provides a well head is repaiied to coal bed gas microstrip pressure to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a coal bed gas microstrip well head device of repairing of pressing, including the casing with the inside oil duct that sets up of casing, be provided with oil pipe in the oil duct, be provided with gas child rubber core in the casing, the outside lateral wall of gas child rubber core is equipped with the annular groove, the annular groove with form annular space between the inboard lateral wall of casing, the top of casing is connected with the high pressure and proclaims oneself, the outside of casing be equipped with an outer interface of annular space intercommunication and with No. two outer interfaces of oil duct intercommunication.

In a preferred embodiment, metal rings are respectively fixed at two ends of the pneumatic tire rubber core, and the outer side wall of each metal ring is sealed with the inner side wall of the shell through an O-shaped sealing ring.

In a preferred embodiment, the first outer connector is connected with an air source through a high-pressure air pipe, and an outlet of the air source is provided with a pressure gauge.

In a preferred embodiment, the high-pressure oil pump is connected with the second external interface on the shell through a high-pressure oil pipe.

In a preferred embodiment, the gas source is a nitrogen cylinder filled with nitrogen.

In a preferred embodiment, a full blowout preventer is arranged below the shell.

In a preferred embodiment, the material of the pneumatic tire rubber core is a cord-nitrile rubber composite material, and the vulcanized cord grid framework greatly improves the strength of the rubber core, so that the rubber core has oil resistance and wear resistance, and the rubber core has better elastic deformation.

In a preferred embodiment, the high-pressure self-sealing device comprises a self-sealing ring arranged in the high-pressure self-sealing device and an upper cover used for fixing the self-sealing ring, and the self-sealing ring can assist in sealing and centering the oil pipe.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the device improves the safety factor of well control, the overflow amount of gas is large when the conventional gas well operates the well, the existing risk is large, the device can solve the problem of low safety factor of high-yield well operation, the danger of operation workers in the well mouth operation is greatly reduced, and the device has few components and low cost;

2. the device can recover combustible gas overflowing in the operation process, reduces environmental pollution, ensures that the production is uninterrupted during pump detection, and reduces the influence of production interruption on the production to the maximum extent;

3. the well killing pollution to the stratum is avoided when the high-yield gas well operates, and the continuity of gas production is guaranteed;

4. when the oil pipe is lifted up in the well workover, the high-pressure oil pump is connected with the lower lubricating oil duct through the high-pressure oil pipe and the second outer interface, and sprays lubricating oil to the outer side wall of the oil pipe, so that the friction force between the outer wall of the oil pipe and the rubber core of the pneumatic tire is effectively reduced, the abrasion of the rubber core of the pneumatic tire is reduced, and when the oil pipe is lifted up in the well workover, the high-pressure oil pump is connected with the lower lubricating oil duct through the high-pressure oil pipe and the second outer interface, and sprays lubricating oil to the outer side wall of the oil pipe, so that the friction force between the outer wall of the oil pipe and the rubber core of the pneumatic tire is effectively reduced, and the service life of the rubber core of the pneumatic tire is prolonged;

5. install high pressure in the upper end of device body and proclaim oneself, the sealing washer of proclaiming oneself at high pressure plays supplementary seal, plays the purpose of rightting oil pipe simultaneously, makes oil pipe be located well head center all the time, guarantees that oil pipe reciprocates at the well head central line, can make the even atress of gas child rubber core expand and reach better sealed effect.

Drawings

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

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The coal bed gas micro-strip pressure workover wellhead device shown in the attached drawing 1 comprises a coal bed gas micro-strip pressure workover wellhead device, and comprises a shell 6 and an oil duct 9 arranged inside the shell 6, wherein an oil pipe 14 is arranged in the oil duct 9, a gas tire rubber core 7 is arranged in the shell (6), an annular groove is arranged on the outer side wall of the gas tire rubber core 7, an annular space is formed between the annular groove and the inner side wall of the shell 6, the top end of the shell 6 is connected with a high-pressure self-sealing 8, and a first outer connector 12 communicated with the annular space and a second outer connector 10 communicated with the oil duct 9 are arranged on the outer side of the shell 6.

And two ends of the pneumatic tire rubber core 7 are respectively fixed with a metal ring 11, and the outer side wall of the metal ring 11 and the inner side wall of the shell 6 are sealed by an O-shaped sealing ring.

The first outer connector 12 is connected with an air source 1 through a high-pressure air pipe 2, and a pressure gauge 3 is installed at an outlet of the air source 1.

The high-pressure oil pump is characterized by further comprising a high-pressure oil pump 4 and a lubricating oil tank 17, wherein the high-pressure oil pump 4 is connected with a second outer connector 10 on the shell 6 through a high-pressure oil pipe 5.

The gas source 1 is a nitrogen bottle filled with nitrogen.

A full blowout preventer 18 is arranged below the shell 6.

The pneumatic tire rubber core 7 is made of a cord thread-nitrile rubber composite material.

The high-pressure self-sealing device 8 comprises a self-sealing ring 15 arranged in the high-pressure self-sealing device and an upper cover 13 used for fixing the self-sealing ring 5.

The utility model discloses a theory of operation: the high-pressure air source 1 is connected with a groove space on the outer side of the air tire rubber core 7 sequentially through the high-pressure air pipe 2 and the first outer connector 12, a closed annular space between the groove of the air tire rubber core 7 and the shell 6 is pressurized by high-pressure air, when the pressure reaches the deformation design pressure of the air tire rubber core 7, the pressurization is stopped, the annular space is kept at the deformation design pressure of the rubber core, the deformation of the air tire rubber core 7 is guaranteed, the oil pipe 14 is continuously held tightly, and the sealing effect is achieved;

when the tubing coupling passes through, the tubing coupling enables the deformation of the air tire rubber core 7 to be reduced, the air tire rubber core presses the cavity between the shell 6 and the air bag, and the tubing coupling smoothly passes through by utilizing the compressibility of air;

the oil pipe is highly mineralized by environment and formation water in the well for a long time, the outer wall of the oil pipe is corroded, scaling and rusting of the outer wall are caused, in the process of lifting the oil pipe, scale and iron rust aggravate friction between the outer wall of the oil pipe and a pneumatic tire rubber core 7, the pneumatic tire rubber core 7 is quickly abraded, the service life of the pneumatic tire rubber core 7 is shortened, in order to prolong the service life of the pneumatic tire rubber core 7, the shell 6 is provided with two lubricating oil ducts 9, when the underground oil discharge 14 pipe is repaired, the high-pressure oil pump 4 is connected with the upper lubricating oil duct 9 through the high-pressure oil pipe 5 and the second outer interface 10, lubricating oil is sprayed to the outer side wall of the oil pipe 14, the friction force between the outer wall of the oil pipe 14 and the pneumatic tire rubber core is effectively reduced, abrasion of the pneumatic tire rubber core 7 is reduced, when the oil pipe 14 is lifted in the well repair well, the high-pressure oil pump 4 is connected with the lower lubricating oil duct 9 through the high-pressure oil pipe 5 and the second outer interface 10, lubricating oil duct is sprayed to the outer side wall of the oil pipe 14, the outer wall of the oil pipe and the pneumatic tire rubber core, the outer wall of the high-pressure oil pipe is effectively reduced, the process of the lifting oil pipe 14, the oil pipe must be lifted up and down, the well, the sealing device can achieve a good sealing effect, and up-up and down well, and down well mouth sealing effect, and down well, and up and down sealing effect can be installed, and down, and up-up and down well-up sealing of the well.

The points to be finally explained are: first, in the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may be a mechanical connection or an electrical connection, or a communication between two elements, and may be a direct connection, and "upper," "lower," "left," and "right" are only used to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed;

secondly, the method comprises the following steps: in the drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are referred to, and other structures can refer to the common design, and under the condition of no conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

and finally: the above description is only for the preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a coal bed gas microstrip well head device of repairing of pressing, includes casing (6), its characterized in that: an oil duct (9) is arranged in the shell (6), and an oil pipe (14) is arranged in the oil duct (9);

casing (6) inboard lateral wall with be provided with gas child rubber core (7) between oil duct (9) the lateral wall, the annular groove has been seted up on the lateral wall of gas child rubber core (7), the annular groove with form annular space between the lateral wall of casing (6) inboard, the top of casing (6) is connected with the high pressure and proclaims oneself (8), the outside of casing (6) be equipped with an outer interface (12) of annular space intercommunication and with No. two outer interface (10) of oil duct (9) intercommunication.

2. The wellhead device for the micro-strip pressure workover according to the coal bed gas, according to the claim 1, is characterized in that: and metal rings (11) are respectively fixed at two ends of the pneumatic tire rubber core (7), and the outer side wall of each metal ring (11) is sealed with the inner side wall of the shell (6) through O-shaped sealing rings.

3. The wellhead device for the micro-strip pressure workover according to the coal bed gas, according to the claim 1, is characterized in that: the first outer connector (12) is connected with an air source (1) through a high-pressure air pipe (2), and a pressure gauge (3) is installed at an outlet of the air source (1).

4. The wellhead device for the micro-strip pressure workover of the coal bed gas according to claim 1, characterized in that: the high-pressure oil pump is characterized by further comprising a high-pressure oil pump (4) and a lubricating oil tank (17), wherein the high-pressure oil pump (4) is connected with a second outer connector (10) on the shell (6) through a high-pressure oil pipe (5).

5. The wellhead device for the micro-strip pressure workover according to the coal bed gas, according to the claim 3, is characterized in that: the gas source (1) is a nitrogen bottle filled with nitrogen.

6. The wellhead device for the micro-strip pressure workover according to the coal bed gas, according to the claim 1, is characterized in that: a full-seal blowout preventer (18) is arranged below the shell (6).

7. The wellhead device for the micro-strip pressure workover according to the coal bed gas, according to the claim 1, is characterized in that: the high-pressure self-sealing device (8) comprises a self-sealing ring (15) arranged in the high-pressure self-sealing device and an upper cover (13) used for fixing the self-sealing ring (15).