CN-224228637-U - Leakage-proof thermal recovery wellhead device

Abstract

The utility model provides a leakage-proof thermal recovery wellhead device, which is characterized in that reliability and operation convenience under high-temperature and high-pressure working conditions are remarkably improved through a multi-stage sealing structure and a modularized valve group design, a two-layer structure of a four-way main body and a small four-way is matched with the distributed layout of six thermal recovery plate valves, multi-channel independent control is realized, sealing surface abrasion caused by frequent opening and closing of the same valve during traditional single-four-way switching is avoided, multiple sealing is adopted at each connecting end, bolt pretightening force attenuation caused by thermal stress can be effectively resisted, interface leakage is prevented, in addition, wellhead pressure can be monitored in real time due to the integrated design of a stop valve and a pressure gauge, and the combination of a test joint and a conversion joint is convenient for quickly accessing external equipment to carry out working condition test or emergency pressure relief, so that safety and maintenance efficiency are greatly improved. The whole structure shows longer service life and lower failure rate in the high-temperature steam flooding process by optimizing the cooperative configuration of the sealing layer and the functional modules.

Inventors

• FAN DELI
• ZHOU CHUNLAN
• CAI JINGYAO
• DING GANG
• ZHANG YANYAN
• XIAO CHUANZHI
• JIANG LIN
• ZHANG YUE
• SUN WEI
• SUN CHUNBIAO
• XU DENGYU

Assignees

• 盐城旭东机械有限公司

Dates

Publication Date

20260512

Application Date

20250513

Claims (5)

1. 1. The leakage-proof thermal recovery wellhead device is characterized by comprising a four-way main body, wherein the left end of the four-way main body is connected with a first thermal recovery flat valve in a sealing manner, the right end of the four-way main body is connected with a second thermal recovery flat valve in a sealing manner, the top end of the four-way main body is connected with a third thermal recovery flat valve in a sealing manner, the third thermal recovery flat valve is connected with a small four-way valve in a sealing manner, the left end of the small four-way valve is connected with a fourth thermal recovery flat valve in a sealing manner, the right end of the small four-way valve is connected with a fifth thermal recovery flat valve in a sealing manner, and the top end of the small four-way valve is connected with a sixth thermal recovery flat valve in a sealing manner; the ends of the first thermal recovery flat valve and the sixth thermal recovery flat valve are respectively and hermetically connected with a stop valve through a stop valve joint, and a pressure gauge is arranged on the stop valve; A heat-resistant pipe nipple is arranged in the four-way main body; the end part of the fifth thermal recovery flat valve is connected with an adapter, and the side part of the adapter is connected with a test connector in a sealing way.
2. 2. The device of claim 1, wherein the bottom end of the four-way body is sealingly connected to the lower flange by a stud and the top end of the four-way body is sealingly connected to the upper flange by a stud.
3. 3. The apparatus of claim 2, wherein the ends of the first, second, third, fourth, fifth, and sixth thermal valves are each sealingly connected to a threaded flange.
4. 4. The apparatus of claim 3, wherein the lower flange, the upper flange, the first thermal plate valve, the second thermal plate valve, the third thermal plate valve, the fourth thermal plate valve, the fifth thermal plate valve, and the sixth thermal plate valve are all sealingly connected by a gasket ring.
5. 5. The apparatus of claim 1, wherein the second thermal recovery plate valve and the fourth thermal recovery plate valve are each sealed with a plug at their ends.

Description

Leakage-proof thermal recovery wellhead device Technical Field The utility model relates to the field of wellhead devices, in particular to a leakage-proof thermal recovery wellhead device. Background The thermal recovery wellhead device is key equipment in the thick oil exploitation process and is mainly used for high-temperature high-pressure steam injection and oil gas output control. In the thermal recovery process, the wellhead device needs to bear high-temperature steam at a temperature of more than 300 ℃ and working pressure above 20MPa for a long time, and meanwhile frequent switching operation and medium corrosion are faced, so that extremely high requirements on the tightness, heat resistance and reliability of the structure are met. In the prior art, the conventional thermal recovery wellhead mostly adopts a single four-way structure, realizes flow switching by connecting a plurality of flat valves through flanges, for example, the main body is of a four-way structure, and the top and the side are respectively connected with a flat valve to control the flow direction of fluid. However, the design has obvious defects in practical application that firstly, a single sealing gasket or a metal winding gasket is adopted between the traditional four-way valve and the flat valve, creep relaxation is easy to occur under high-temperature cyclic load, so that the leakage risk of a flange joint is increased, secondly, the flat valve is single in arrangement mode (for example, only left and right and top valves are configured), the multi-channel switching requirement under complex working conditions is difficult to adapt, the valve group is required to be shut down integrally during maintenance, the mining efficiency is influenced, and thirdly, the existing device lacks an integrated pressure monitoring and testing interface, an operator cannot grasp internal pressure change in real time, and an external temporary pipeline is required during testing or emergency pressure relief, so that potential safety hazards exist. In addition, the main pipe section of part of the wellhead device is not provided with a heat-resistant strengthening structure, and is easy to deform under the action of long-term high temperature, so that the problem of sealing failure is further aggravated. For example, some oil fields have resulted in steam leaks due to thermal fatigue cracking of wellhead bodies, resulting in serious production accidents. Therefore, how to design a thermal recovery wellhead device with better sealing performance, flexible valve configuration and heat resistance and deformation resistance becomes a technical problem to be solved in the field. Disclosure of utility model The utility model aims to provide a leakage-proof thermal recovery wellhead device, which solves the problems in the prior art. In order to achieve the above object, the present utility model provides the following solutions: The utility model provides a leakage-proof thermal recovery wellhead device, which comprises a four-way main body, wherein the left end of the four-way main body is connected with a first thermal recovery flat valve in a sealing manner, the right end of the four-way main body is connected with a second thermal recovery flat valve in a sealing manner, the top end of the four-way main body is connected with a third thermal recovery flat valve in a sealing manner, the third thermal recovery flat valve is connected with a small four-way in a sealing manner, the left end of the small four-way is connected with a fourth thermal recovery flat valve in a sealing manner, the right end of the small four-way is connected with a fifth thermal recovery flat valve in a sealing manner, and the top end of the small four-way is connected with a sixth thermal recovery flat valve in a sealing manner. Preferably, the bottom of the four-way main body is in sealing connection with the lower flange through a stud, and the top of the four-way main body is in sealing connection with the upper flange through a stud. Preferably, the first thermal recovery plate valve, the second thermal recovery plate valve, the third thermal recovery plate valve, the fourth thermal recovery plate valve, the fifth thermal recovery plate valve and the end parts of the sixth thermal recovery plate valve are all in sealing connection with screw flanges. Preferably, the lower flange, the upper flange, the first thermal recovery plate valve, the second thermal recovery plate valve, the third thermal recovery plate valve, the fourth thermal recovery plate valve, the fifth thermal recovery plate valve and the sixth thermal recovery plate valve are all in sealing connection through a sealing gasket ring. Preferably, the end parts of the first thermal recovery flat valve and the sixth thermal recovery flat valve are respectively connected with a stop valve through a stop valve connector in a sealing way, and a pressure gauge is arranged on the stop valve. Preferably, a hea