阅读说明：本技术 井下双泵筒预置抽油泵及抽油方法 (Underground double-pump-barrel preset oil well pump and oil pumping method ) 是由 杨海涛 刘汉斌 黄伟 甘庆明 李佰涛 辛宏 张磊 王亚慧 魏韦 呼苏娟 于 2020-07-02 设计创作，主要内容包括：本发明提供一种井下双泵筒预置抽油泵及抽油方法,该抽油泵包括偏心阀、下泵柱塞、上泵柱塞、下泵筒、上泵筒、油管和抽油杆；所述的油管下端依次与上泵筒和下泵筒连接,上泵筒下端设置有偏心阀；所述的抽油杆位于油管内,所述的下泵柱塞与抽油杆连接,下泵柱塞位于下泵筒上方,所述的上泵柱塞与抽油杆连接,且位于上泵筒上方。双泵筒预置抽油泵分上下两个泵筒,上泵筒下端设置了偏心阀,上泵筒、上泵柱塞和抽油杆组成上泵,即偏心阀管式泵,偏心阀管式泵抽油一定时间磨损后,下放抽油杆,使得下泵柱塞进入下泵筒,继续正常抽油。(The invention provides a downhole double-pump-cylinder preset oil well pump and an oil pumping method, wherein the oil well pump comprises an eccentric valve, a lower pump plunger, an upper pump plunger, a lower pump cylinder, an upper pump cylinder, an oil pipe and an oil pumping rod; the lower end of the oil pipe is sequentially connected with an upper pump cylinder and a lower pump cylinder, and the lower end of the upper pump cylinder is provided with an eccentric valve; the sucker rod be located the oil pipe, the lower pump plunger be connected with the sucker rod, lower pump plunger is located pump barrel top down, last pump plunger be connected with the sucker rod, and be located pump barrel top. The double-pump barrel preset oil well pump is divided into an upper pump barrel and a lower pump barrel, an eccentric valve is arranged at the lower end of the upper pump barrel, an upper pump plunger and the sucker rod form an upper pump, namely an eccentric valve tubular pump, and the sucker rod is lowered after the eccentric valve tubular pump is worn for pumping oil for a certain time, so that the lower pump plunger enters the lower pump barrel to continue to pump oil normally.)

1. The underground double-pump-barrel preset oil well pump is characterized in that: comprises an eccentric valve (1), a lower pump plunger (2), an upper pump plunger (3), a lower pump barrel (4), an upper pump barrel (5), an oil pipe (6) and a sucker rod (7); the lower end of the oil pipe (6) is sequentially connected with the upper pump cylinder (5) and the lower pump cylinder (4), and the lower end of the upper pump cylinder (5) is provided with an eccentric valve (1); sucker rod (7) be located oil pipe (6), lower pump plunger (2) be connected with sucker rod (7), lower pump plunger (2) are located pump barrel (4) top down, last pump plunger (3) be connected with sucker rod (7), and be located pump barrel (5) top.

2. The downhole dual-pump cylinder preset oil well pump according to claim 1, characterized in that: the upper pump cylinder (5) and the lower pump cylinder (4) have the same structure, and the lower pump cylinder (4) is preset underground.

3. The downhole dual-pump cylinder preset oil well pump according to claim 1, characterized in that: the lower end of the lower pump barrel (4) is provided with a sieve tube (8).

4. The downhole dual-pump cylinder preset oil well pump according to claim 1, characterized in that: the lower end of the sieve tube (8) is provided with a plug (9).

5. The downhole dual-pump cylinder preset oil well pump according to claim 1, characterized in that: the upper pump plunger (3) reciprocates along with the sucker rod (7).

6. The downhole dual-pump cylinder preset oil well pump according to claim 1, characterized in that: the diameter of the lower pump plunger (2) is matched with the inner diameter of the lower pump barrel (4).

7. The downhole dual-pump cylinder preset oil well pump according to claim 1, characterized in that: the lower pump plunger (2) is in contact connection with the inner wall of the lower pump barrel (4).

8. The method for pumping oil from the pre-pump of the downhole dual-pump cylinder according to any one of claims 1 to 7, wherein: the method comprises the following specific steps: when oil is pumped, liquid enters the oil pipe (6) from the oil sleeve annulus, after the oil pipe at the lower part is filled with the liquid, the upper pump plunger (3) reciprocates along with the oil pumping rod (7), and the liquid is lifted to the ground through the upper pump barrel (5); after the upper pump barrel (5) is abraded after pumping oil for a certain time, the sucker rod (7) is lowered down, the lower pump plunger (2) enters the lower pump barrel (4), and normal oil pumping is continued.

Technical Field

The invention relates to an underground double-pump-barrel preset oil well pump designed for a sucker rod pump oil well of an oil field pumping unit and an oil pumping method, belonging to the technical field of oil extraction processes in the petroleum and natural gas industry.

Background

In recent years, the price of crude oil is continuously low, the completion of production tasks is difficult, and oil fields face a plurality of difficulties and challenges. The minor repair operation of the oil well in the oil field in the Changqing year 2018 reaches more than 5 ten thousand well times, wherein the minor repair proportion of the oil well is 10.79 percent due to pump leakage. If the number of the lost pump wells can be greatly reduced, the number of the pump detection wells per year can be reduced, and the pump detection period can be further prolonged. The deep well double-fixed valve pump with the Chinese patent publication No. CN2711410Y has the advantages that the lower part of the upper fixed valve is connected with the pump barrel through the joint, the lower fixed valve is the same as the upper fixed valve, and the fixed valve of the deep well double-fixed valve pump plays a sealing role under the condition that the leakage amount of the upper fixed valve is large, so that the pump checking period is prolonged. However, the deep well double-fixed valve pump only has the sealing function and cannot realize oil extraction at the same time.

Disclosure of Invention

In order to solve the problems of short pump detection period and high pump detection operation frequency under the premise of not influencing the oil pumping operation, the invention provides an underground double-pump cylinder preset oil well pump and an oil pumping method. The upper pump is provided with an eccentric valve to form an eccentric valve tubular pump, and after the eccentric valve tubular pump is worn for a certain time, the sucker rod is lowered down, so that the lower pump plunger enters the lower pump barrel to continue to pump oil normally. The invention can reduce the number of the leakage wells of the pump to a greater extent, reduce the times of pump detection operation of the oil field every year and prolong the period of pump detection under the condition of not influencing the pumping of the sucker rod.

The technical scheme adopted by the invention is as follows:

the underground double-pump cylinder preset oil well pump comprises an eccentric valve, a lower pump plunger, an upper pump plunger, a lower pump cylinder, an upper pump cylinder, an oil pipe and an oil pumping rod; the lower end of the oil pipe is sequentially connected with an upper pump cylinder and a lower pump cylinder, and the lower end of the upper pump cylinder is provided with an eccentric valve; the sucker rod be located the oil pipe, the lower pump plunger be connected with the sucker rod, lower pump plunger is located pump barrel top down, last pump plunger be connected with the sucker rod, and be located pump barrel top.

The upper pump cylinder and the lower pump cylinder have the same structure, and the lower pump cylinder is preset underground.

The lower end of the lower pump cylinder is provided with a sieve tube.

The lower end of the sieve tube is provided with a plug.

The upper pump plunger reciprocates along with the sucker rod.

The diameter of the lower pump plunger is matched with the inner diameter of the lower pump barrel.

And the lower pump plunger is in contact connection with the inner wall of the lower pump barrel.

The oil pumping method of the underground double-pump-barrel preset oil well pump comprises the following specific steps:

when oil is pumped, liquid enters the oil pipe from the oil sleeve annulus, after the lower oil pipe is filled with the liquid, the upper pump plunger reciprocates along with the sucker rod, and the liquid is lifted to the ground through the upper pump barrel; after the upper pump barrel is worn after pumping oil for a certain time, the sucker rod is lowered down, and the lower pump plunger enters the lower pump barrel to continue pumping oil normally.

The invention has the beneficial effects that:

the invention designs an underground preset oil well pump combined structure with an upper tubular pump and a lower tubular pump connected in series by reforming waste materials in an oil field, and the lower pump cylinder can continuously work to pump oil without repairing a well when an upper pump cylinder fails. The pump inspection period of the oil well is prolonged, the pump inspection workload is reduced, and the exploitation cost is reduced.

The invention relates to an underground double-pump-cylinder preset oil well pump, which is characterized in that a double-pump technology is adopted, the existing conventional tubular pump in an oil field is utilized for reconstruction, one pump normally works, the other oil well pump is preset underground, and the oil well pump continues to work after the upper pump is worn and lost, so that the pump detection period is prolonged, and the work workload is reduced.

The following will be further described with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

FIG. 2 is a schematic structural diagram of the present invention during oil pumping operation.

In the figures, the reference numbers are: 1. an eccentric valve; 2. a pump plunger is arranged; 3. an upper pump plunger; 4. a pump cylinder is arranged; 5. an upper pump barrel; 6. an oil pipe; 7. a sucker rod; 8. a screen pipe; 9. and (5) plugging with a thread.

Detailed Description