阅读说明：本技术 一种油井冲砂返出液截止阀及其使用方法 (Oil well sand washing liquid returning stop valve and using method thereof ) 是由 王金刚 王鸿章 田玉琛 包福忠 祁俊武 苏峰 方军伟 张延平 殷学明 袁海平 安 于 2019-10-30 设计创作，主要内容包括：本发明属于油气田工具技术领域,具体提供了一种油井冲砂返出液截止阀及其使用方法,该截止阀包括上接头、挡板、压力平衡弹簧、截止阀本体、坐封球、球座、上部油管公扣和下部油管母扣,解决了现有技术中油井冲砂时,在换单根的过程中井场依然到处是水,无法达到《环境保护法》的要求,以及在反循环冲砂过程中,泵入液体流向与冲砂换单根时返出液流向一致,不能在入井管柱上安装单流阀,而且在冲砂过程中如果出现工程复杂,需要进行正冲和反冲,安装单流阀无法满足施工要求的问题；本发明可有效封堵冲砂作业更换单根过程中返出液外溢,解决污染环境,有效指导现场施工,提高普通油管冲砂作业效率,降低安全环保风险。(The invention belongs to the technical field of oil and gas field tools, and particularly provides an oil well sand washing liquid return stop valve and a use method thereof, wherein the stop valve comprises an upper joint, a baffle plate, a pressure balance spring, a stop valve body, a seat ball, a ball seat, an upper oil pipe male buckle and a lower oil pipe female buckle, so that the problems that when sand washing is carried out on an oil well in the prior art, the well field is still everywhere water in the single sand washing process, the requirement of an environmental protection law cannot be met, in the reverse circulation sand washing process, the flow direction of pumped liquid is consistent with the flow direction of return liquid when the single sand washing is carried out, a check valve cannot be installed on a well entering pipe column, and if the engineering is complicated in the sand washing process, the forward washing and the reverse washing are needed, and the construction requirement cannot be met by installing the; the invention can effectively block the overflow of the return liquid in the process of replacing single joint in the sand washing operation, solve the problem of environmental pollution, effectively guide field construction, improve the sand washing operation efficiency of a common oil pipe and reduce the safety and environmental protection risks.)

1. The utility model provides an oil well sand washing returns play liquid stop valve which characterized in that: the automatic sealing device comprises an upper joint (1), a baffle (2), a pressure balance spring (3), a stop valve body (4), a seat sealing ball (5), a ball seat (6), an upper oil pipe male buckle (7) and a lower oil pipe female buckle (8), the upper oil pipe male buckle (7), the upper joint (1), the stop valve body (4) and the lower oil pipe female buckle (8) are sequentially connected from top to bottom, the baffle (2) is sequentially arranged in the stop valve body (4) from top to bottom, the pressure balance spring (3), the seat sealing ball (5) and the ball seat (6), the baffle (2) is connected with the pressure balance spring (3) and the baffle (2) and the pressure balance spring (3) are both located on the upper portion of the stop valve body (4), the ball seat (6) is connected to the lower portion of the stop valve body (4), and the seat sealing ball (5) can be seated on the ball seat sealing.

2. The oil well sand-flushing fluid-return stop valve as claimed in claim 1, characterized in that: the upper joint (1) adopts 27/8' oil pipe UPTBG buckle.

3. The oil well sand-flushing fluid-return stop valve as claimed in claim 2, characterized in that: the baffle (2) is a cross baffle.

4. The oil well sand-flushing fluid-return stop valve as claimed in claim 3, characterized in that: the pressure balance spring (3) is divided into a plurality of pressure balance grades according to the pressure of a wellhead in the sand washing process of the construction well, and the pressure balance grades at least comprise 0.5MPa, 1.0MPa and 1.5 MPa.

5. The oil well sand-flushing fluid-return stop valve as claimed in claim 4, characterized in that: the outer diameter of the stop valve body (4) is not more than 95mm, and the tensile strength of the stop valve body is matched with that of a tool oil pipe used on site.

6. The oil well sand-flushing fluid-return stop valve as claimed in claim 5, characterized in that: the setting ball (5) is matched with the ball seat (6) for use.

7. The oil well sand-flushing fluid-return stop valve as claimed in claim 6, characterized in that: also comprises a cutting knife which is arranged at the bottom of the ball seat (6).

8. The oil well sand-flushing fluid-return stop valve as claimed in claim 7, characterized in that: the cutting knife is a cross cutting knife.

9. The oil well sand-flushing fluid-return stop valve as claimed in claim 8, characterized in that: the baffle (2) is connected in the stop valve body (4) through threads.

10. The use method of the sand washing and liquid returning stop valve for the oil well is characterized in that: the method comprises the following steps:

in the process of pumping liquid for circulating sand washing, the liquid flow pushes the setting ball (5) to leave the ball seat (6), and the sand washing liquid return stop valve of the oil well is in an open state, so that sand washing operation can be carried out;

when a single joint is replaced, the pumping of liquid is stopped, the setting ball (5) falls on the ball seat (6) under the self weight and the elastic force of the pressure balance spring (3), the sand washing and liquid return stop valve of the oil well is in a closed state, and the wellhead stops returning water outwards;

when a positive circulation channel needs to be established, the sitting sealing ball (5) can be broken by squeezing, and the sand washing and liquid returning stop valve of the oil well is opened to carry out positive and reverse circulation.

Technical Field

The invention belongs to the technical field of oil and gas field tools, and particularly relates to an oil well sand washing and liquid returning stop valve and a using method thereof.

Background

At present, sand washing of oil wells is basically reverse circulation and open operation, return liquid directly enters a sewage drainage pit through a drainage channel after being collected at a well head and is sprinkled on a well site to form a Wangyuan land. With the promulgation of a new environmental protection law, the sand washing mode is not suitable for an operation site, open operation is not advisable, and under the condition that a new process can be replaced, a high-pressure elbow and a high-pressure water hose can be connected to a single oil pipe on the site, so that a large amount of returned liquid is connected to a sand setting tank for recovery. However, in the process of changing single joint, due to the exciting pressure of liquid in the well and the fact that a part of the liquid contains a small amount of gas, when the single joint is connected, the tubing coupling is at a height of 10 meters, the return liquid can be lifted by 10 meters and then spilled, the well site is still everywhere water, and the requirements of the environmental protection law cannot be met. In the process of reverse circulation sand washing, the flow direction of the pumped liquid is consistent with the flow direction of the return liquid when the sand washing is single, a check valve cannot be installed on the well entering pipe column, and if engineering is complex in the process of sand washing, forward washing and reverse washing are required, and the installation of the check valve cannot meet construction requirements.

Disclosure of Invention

The invention provides an oil well sand washing liquid return stop valve and a using method thereof, aiming at overcoming the problems that in the prior art, when oil well sand washing is carried out, in the process of changing single joint, due to exciting pressure of liquid in a well, part of the liquid also contains a small amount of gas, when the single joint is connected, an oil pipe coupling is at a height of 10 meters, the return liquid can be lifted by 10 meters and then spilled, a well site is still filled with water everywhere, and the requirement of the environmental protection law cannot be met; the problem that in the prior art, in the reverse circulation sand washing process, the flow direction of pumped liquid is consistent with the flow direction of returned liquid when sand washing is performed for replacing a single sand, a check valve cannot be installed on a well entering pipe column, and if engineering is complex in the sand washing process, forward flushing and reverse flushing are required, and the installation of the check valve cannot meet construction requirements is solved.

Therefore, the invention provides an oil well sand washing liquid returning stop valve which comprises an upper joint, a baffle plate, a pressure balance spring, a stop valve body, a setting ball, a ball seat, an upper oil pipe male buckle and a lower oil pipe female buckle, wherein the upper oil pipe male buckle, the upper joint, the stop valve body and the lower oil pipe female buckle are sequentially connected from top to bottom, the baffle plate, the pressure balance spring, the setting ball and the ball seat are sequentially arranged in the stop valve body from top to bottom, the pressure balance spring is connected below the baffle plate, the baffle plate and the pressure balance spring are both positioned on the upper part of the stop valve body and are connected to the lower part of the stop valve body, and the setting ball can be set on the ball seat.

The upper joint is buckled by 27/8' oil pipe UPTBG.

The baffle is a cross baffle.

The pressure balance spring is divided into a plurality of pressure balance grades according to the pressure of a wellhead in the sand washing process of the construction well, and the pressure balance grades at least comprise 0.5MPa, 1.0MPa and 1.5 MPa.

The outer diameter of the stop valve body is not more than 95mm, and the tensile strength of the stop valve body is matched with that of a tool oil pipe used on site.

The seat sealing ball is matched with the ball seat for use.

The cutting knife is arranged at the bottom of the ball seat.

The cutting knife is a cross cutting knife.

The baffle is connected in the stop valve body through threads.

The use method of the oil well sand washing and liquid returning stop valve comprises the following steps:

in the process of pumping liquid for circulating sand washing, the liquid flow pushes the setting ball to leave the ball seat, and the sand washing liquid return stop valve of the oil well is in an open state, so that sand washing operation can be carried out;

when a single joint is replaced, the pumping of liquid is stopped, the setting ball falls on the ball seat under the action of the self weight and the elastic force of the pressure balance spring, the sand washing and liquid returning stop valve of the oil well is in a closed state, and the wellhead stops returning water outwards;

when a positive circulation channel needs to be established, the sitting sealing ball can be broken by squeezing, and the sand washing and liquid returning stop valve of the oil well is opened to carry out positive and reverse circulation.

The invention has the beneficial effects that: the invention provides an oil well sand washing and liquid returning stop valve which comprises an upper connector, a baffle plate, a pressure balance spring, a stop valve body, a setting ball, a ball seat, an upper oil pipe male fastener and a lower oil pipe female fastener, wherein the upper oil pipe male fastener, the upper connector, the stop valve body and the lower oil pipe female fastener are sequentially connected from top to bottom, the baffle plate, the pressure balance spring, the setting ball and the ball seat are sequentially arranged in the stop valve body from top to bottom, the pressure balance spring is connected below the baffle plate, the baffle plate and the pressure balance spring are both positioned on the upper part of the stop valve body, the ball seat is connected to the lower part of the stop valve body, and the setting ball can be set on the. The sand washing and liquid returning stop valve for the oil well is designed by utilizing the pressure balance principle, and the using method is that in the process of pumping liquid for circulating sand washing, the liquid flow pushes the setting ball to leave the ball seat, and the sand washing and liquid returning stop valve for the oil well is in an open state, so that sand washing operation can be carried out; when a single joint is replaced, the pumping of liquid is stopped, exciting pressure still exists in the liquid in the well (a gas cap also exists in partial conditions), the setting ball falls on the ball seat under the action of the self weight and the elastic force of the pressure balance spring, the sand washing and liquid return stop valve of the oil well is in a closed state, the well mouth stops returning water outwards, and the liquid cannot float when the oil pipe coupling is at a height of 10 meters; when the engineering is complicated, and a positive circulation channel needs to be established, the sitting sealing ball can be crushed by extrusion, and the sand washing and liquid returning stop valve of the oil well is opened to carry out positive and reverse circulation. The sand washing and liquid returning stop valve for the oil well can effectively block overflow of returned liquid in the sand washing operation single-joint replacement process, solves the problems of environmental pollution and the like, also meets the people-oriented working concept, improves the safety and environment-friendly management level of an operation site, and can open the stop valve to carry out positive and reverse circulation by crushing a sitting and sealing ball through a bit when a project is complicated; therefore, the invention can effectively guide the site construction, improve the sand washing operation efficiency of the common oil pipe and reduce the safety and environmental protection risks.

Drawings

The present invention will be described in further detail below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of an oil well sand washing and liquid returning stop valve.

Description of reference numerals: 1. an upper joint; 2. a baffle plate; 3. a pressure balance spring; 4. a stop valve body; 5. setting a ball; 6. a ball seat; 7. an upper oil pipe male buckle; 8. and the lower oil pipe is in female joint.

Detailed Description