CN215292419U

CN215292419U - Oil recovery well head sealing device

Info

Publication number: CN215292419U
Application number: CN202121458772.1U
Authority: CN
Inventors: 焦玉霞; 张宇; 王鹏红
Original assignee: Puyang Yufei Petroleum Machinery Equipment Co ltd
Current assignee: Puyang Yufei Petroleum Machinery Equipment Co ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-12-24
Anticipated expiration: 2031-06-29

Abstract

The utility model relates to a sealing device field, concretely relates to oil recovery wellhead sealing device. The inner ring is fixed in the buffer cavity, an inner sleeve is fixed in the inner ring, the polished rod runs through the inner sleeve and is connected with the inner sleeve in a sliding and sealing mode, the lower end of the inner sleeve is fixed with an inner taper sleeve concentric with the inner sleeve, the polished rod runs through the inner taper sleeve, a gap is formed between the inner taper sleeve and a bottom plate of the buffer cavity, an outer taper sleeve is sleeved on the outer side of the inner taper sleeve, the lower end of the outer taper sleeve is fixedly connected with the bottom plate of the buffer cavity, a gap is formed between the upper end of the outer taper sleeve and the inner ring, a gap is formed between the inner edge of the outer taper sleeve and the outer edge of the inner taper sleeve, and a discharge pipe communicated with the buffer cavity is fixed on the buffer cavity. The utility model discloses, when the blowout phenomenon appears, can in time release the pressure to avoid the waste of oil and the pollution of environment, can ensure staff's safety, it is with low costs, reduced the emergence of accident in the pit, improved the oil field productivity effect.

Description

Oil recovery well head sealing device

Technical Field

The utility model relates to a sealing device field, concretely relates to oil recovery wellhead sealing device.

Background

With the increasing demand for energy, oil extraction has become an important approach to energy supply. With the extension of the development process and production time of oil fields, the workload of a plurality of technical measures of oil wells is increasing. The wellhead device is important equipment for ensuring normal production of an oil well, and particularly, the oil extraction wellhead device has various structures although the types are various. However, with the increase of the use times, the defects of the method are increasingly obvious, the parts of the method are often damaged and difficult to maintain, the method is not provided with a good sealing structure, leakage accidents are easily caused, multiple process operations cannot be reliably realized, the service life is short, and the mining cost of enterprises is increased. When the blowout phenomenon appears, the existing oil extraction wellhead sealing device cannot timely release pressure, so that the waste of petroleum and the pollution to the environment are caused, and the safety of personnel cannot be ensured.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a simple structure, convenient to use when the blowout phenomenon appears, can in time release pressure to avoid the waste of oil and the pollution of environment, can ensure staff's safe oil recovery well head sealing device.

In order to realize the purpose, the utility model provides a technical scheme is:

a sealing device for an oil production well mouth comprises a buffer cavity, wherein an upper pipe and a lower pipe communicated with the buffer cavity are respectively fixed at the upper end and the lower end of the buffer cavity, the lower pipe is fixedly and hermetically connected with a well mouth, a plurality of sealing rings are installed in the upper pipe, a pressing cap is in threaded connection with the upper end of the upper pipe, a pressing ring is fixed in the pressing cap, the pressing ring tightly abuts against the sealing rings, a polish rod penetrates through the pressing cap, the pressing ring, the sealing rings, the upper pipe, the buffer cavity and the lower pipe and is in sliding and sealing connection with the sealing rings, the sealing device is characterized in that an inner ring is fixed in the buffer cavity, an inner sleeve is fixed in the inner ring, the polish rod penetrates through the inner sleeve and is in sliding and sealing connection with the inner sleeve, an inner taper sleeve concentric with the inner taper sleeve is fixed at the lower end of the inner sleeve, a gap is arranged between the inner taper sleeve and the buffer cavity bottom plate, an outer taper sleeve is sleeved at the outer taper sleeve, a gap is arranged between the upper end of the outer taper sleeve and the inner ring, a gap is arranged between the inner edge of the outer taper sleeve and the outer edge of the inner taper sleeve, and a calandria communicated with the buffer cavity is fixed on the buffer cavity.

Specifically, a plurality of supporting rods are fixed on the outer edge of the inner ring and fixedly connected with the buffer cavity.

Specifically, a sealing sleeve is fixed on the inner edge of the inner sleeve, and the polished rod is in sliding sealing connection with the inner sleeve through the sealing sleeve.

Specifically, the outer edge of the sealing ring is connected with the inner edge of the upper pipe in a sealing manner.

Specifically, a plurality of branches set up according to the axle center circumference equipartition of cushion chamber.

Specifically, the upper pipe, the lower pipe, the polish rod and the buffer cavity are concentrically arranged.

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

the utility model discloses, simple structure, convenient to use, it is sealed effectual, when the blowout phenomenon appears, can in time release pressure to avoid the waste of oil and the pollution of environment, can ensure staff's safety, it is with low costs, reduced the emergence of accident in the pit, improved the oil field productivity effect.

Drawings

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

Detailed Description

As shown in figure 1, the oil production wellhead sealing device comprises a buffer cavity 1, wherein an upper pipe 3 and a lower pipe 2 which are communicated with the buffer cavity 1 are respectively fixed at the upper end and the lower end of the buffer cavity 1, the lower pipe 2 is fixedly and hermetically connected with a wellhead, a plurality of sealing rings 4 are installed in the upper pipe 3, the outer edges of the sealing rings 4 are hermetically connected with the inner edge of the upper pipe 3, the upper end of the upper pipe 3 is in threaded connection with a pressing cap 6, a pressing ring 5 is fixed in the pressing cap 6, the pressing ring 5 tightly abuts against the sealing rings 4, a polished rod 14 penetrates through the pressing cap 6, the pressing ring 5, the sealing rings 4, the upper pipe 3, the buffer cavity 1 and the lower pipe 2, the upper pipe 3, the lower pipe 2, the polished rod 14 and the buffer cavity 1 are concentrically arranged, the polished rod 14 is in sliding and hermetically connected with the sealing rings 4, an inner ring 8 is fixed in the buffer cavity 1, a plurality of supporting rods 9 are fixed at the outer edge of the inner ring 8, the supporting rods 9 are fixedly connected with the buffer cavity 1, the supporting rods 9 are uniformly distributed according to the circumference of the axis of the buffer cavity 1, an inner sleeve 12 is fixed inside the inner ring 8, a polished rod 14 penetrates through the inner sleeve 12 and is in sliding sealing connection with the inner sleeve 12, a sealing sleeve 13 is fixed on the inner edge of the inner sleeve 12, the polished rod 14 is in sliding sealing connection with the inner sleeve 12 through the sealing sleeve 13, an inner taper sleeve 10 concentric with the inner sleeve 12 is fixed at the lower end of the inner sleeve 12, the polished rod 14 penetrates through the inner taper sleeve 10, a gap is formed between the inner taper sleeve 10 and a bottom plate of the buffer cavity 1, an outer taper sleeve 11 is sleeved on the outer side of the inner taper sleeve 10, the lower end of the outer taper sleeve 11 is fixedly connected with the bottom plate of the buffer cavity 1, a gap is formed between the upper end of the outer taper sleeve 11 and the inner ring 8, a gap is formed between the inner edge of the outer taper sleeve 11 and the outer edge of the inner taper sleeve 10, and a discharge pipe 7 communicated with the buffer cavity 1 is fixed on the buffer cavity.

The utility model discloses during the use, low tube 2 is fixed in the well head upper end, when taking place the blowout phenomenon, oil passes through low tube 2, clearance between 1 bottom plate of cushion chamber and the polished rod 14 enters into between interior taper sleeve 10 and the polished rod 14, under the guide effect of interior taper sleeve 10 inner edge, oil passes through the clearance between interior taper sleeve 10 and the outer taper sleeve 11 and flows, the oil that flows out from the clearance between interior taper sleeve 10 and the outer taper sleeve 11 flows to the cushion chamber 1 in the outer taper sleeve 11 outside after blockking by inner ring 8, through make oil including taper sleeve 10 inside, between interior taper sleeve 10 and the outer taper sleeve 11, and the flow between outer taper sleeve 11 and the inner ring 8, thereby can cushion the pressure release to the oil of blowout, can effectually prevent the emergence of blowout phenomenon. When the oil pressure in the buffer cavity 1 is too high, the calandria 7 can be opened, and the oil in the buffer cavity 1 can be discharged from the calandria 7, so that the buffer capacity is further improved, and the sealing performance is improved.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A sealing device for an oil production well mouth comprises a buffer cavity, wherein an upper pipe and a lower pipe communicated with the buffer cavity are respectively fixed at the upper end and the lower end of the buffer cavity, the lower pipe is fixedly and hermetically connected with a well mouth, a plurality of sealing rings are installed in the upper pipe, a pressing cap is in threaded connection with the upper end of the upper pipe, a pressing ring is fixed in the pressing cap, the pressing ring tightly abuts against the sealing rings, a polish rod penetrates through the pressing cap, the pressing ring, the sealing rings, the upper pipe, the buffer cavity and the lower pipe and is in sliding and sealing connection with the sealing rings, the sealing device is characterized in that an inner ring is fixed in the buffer cavity, an inner sleeve is fixed in the inner ring, the polish rod penetrates through the inner sleeve and is in sliding and sealing connection with the inner sleeve, an inner taper sleeve concentric with the inner taper sleeve is fixed at the lower end of the inner sleeve, a gap is arranged between the inner taper sleeve and the buffer cavity bottom plate, an outer taper sleeve is sleeved at the outer taper sleeve, a gap is arranged between the upper end of the outer taper sleeve and the inner ring, a gap is arranged between the inner edge of the outer taper sleeve and the outer edge of the inner taper sleeve, and a calandria communicated with the buffer cavity is fixed on the buffer cavity.

2. A producing wellhead sealing device according to claim 1 wherein a plurality of struts are fixed to the outer periphery of the inner ring and are fixedly connected to the buffer chamber.

3. The oil recovery wellhead sealing device as claimed in claim 1, wherein a gland is fixed to the inner edge of the inner sleeve, and the polish rod is in sliding sealing connection with the inner sleeve through the gland.

4. A production wellhead sealing device according to claim 1 wherein the outer edge of the sealing ring is sealingly connected to the inner edge of the upper tubular.

5. A producing wellhead sealing device according to claim 2 wherein the plurality of struts are arranged circumferentially and evenly about the axis of the buffer chamber.

6. A producing wellhead sealing device according to claim 1 wherein the upper pipe, lower pipe, polish rod and buffer chamber are concentrically arranged.