CN111734601A - Downhole double-pump pre-set oil pump and oil pumping method - Google Patents

Abstract

The invention provides an underground double pump barrel preset oil pump and an oil pumping method. The oil pump includes an eccentric valve, a lower pump plunger, an upper pump plunger, a lower pump barrel, an upper pump barrel, an oil pipe and a sucker rod; The lower end of the oil pipe is connected with the upper pump barrel and the lower pump barrel in turn, and the lower end of the upper pump barrel is provided with an eccentric valve; the sucker rod is located in the oil pipe, the lower pump plunger is connected with the sucker rod, and the lower pump column The plug is located above the lower pump barrel, the upper pump plunger is connected with the sucker rod, and is located above the upper pump barrel. The double-barrel preset oil pump is divided into upper and lower pump barrels. An eccentric valve is set at the lower end of the upper pump barrel. The upper pump barrel, the upper pump plunger and the sucker rod form the upper pump, that is, the eccentric valve tube type After the pump is worn out for a certain period of time, lower the sucker rod so that the plunger of the lower pump enters the lower pump barrel and continue to pump oil normally.

Description

Downhole double-pump pre-set oil pump and oil pumping method

technical field

The invention relates to an underground double-pump barrel pre-set oil pump and a pumping method designed for oil wells with rod pumps in oil fields, and belongs to the technical field of oil production technology in the oil and natural gas industry.

Background technique

In recent years, crude oil prices have continued to operate at a low level, making it difficult to complete production tasks, and oilfields are facing many difficulties and challenges. In 2018, the minor repairs of oil wells in Changqing Oilfield reached more than 50,000 well-times, of which losses due to pumps accounted for 10.79% of the minor repairs of oil wells. If the number of wells lost due to pump leakage can be reduced to a greater extent, the number of wells to be inspected annually will be reduced, and the cycle of pump inspections will be further extended. The Chinese Patent Publication No. CN2711410Y is a deep well double fixed valve pump, the upper fixed valve is connected to the pump barrel through a joint, and the lower fixed valve is the same as the upper fixed valve, and the deep well double fixed valve is fixed on the upper valve. Only when the leakage is large, the valve can be fixed to play a sealing role, which prolongs the pump inspection cycle. However, the deep well double-fixed Vall pump only has the function of sealing and cannot realize oil production at the same time.

SUMMARY OF THE INVENTION

In order to overcome the existing problems of short pump inspection period and high pump inspection operation times without affecting the oil pumping work, the present invention provides an underground double pump barrel preset oil pump and an oil pumping method. The oil well pump is divided into upper and lower pump barrels, and the upper and lower pumps share a sucker rod. The upper pump has an eccentric valve, which becomes an eccentric valve tubular pump. After the eccentric valve tubular pump is worn for a certain period of time, the sucker rod is lowered so that the lower pump plunger enters the lower pump barrel and continues to pump oil normally. The invention can greatly reduce the number of wells lost by the pump, reduce the number of pump inspection operations per year in the oil field, and prolong the pump inspection period without affecting the sucker rod for pumping oil.

The technical scheme adopted in the present invention is:

A pre-set oil well pump with double pump barrels includes an eccentric valve, a lower pump plunger, an upper pump plunger, a lower pump barrel, an upper pump barrel, an oil pipe and a sucker rod; the lower end of the oil pipe is connected to the upper pump barrel and the lower pump in turn. The lower end of the upper pump barrel is provided with an eccentric valve; the sucker rod is located in the oil pipe, the lower pump plunger is connected with the sucker rod, the lower pump plunger is located above the lower pump barrel, and the upper pump The plunger is connected to the sucker rod and is located above the upper pump barrel.

The upper pump barrel has the same structure as the lower pump barrel, and the lower pump barrel is preset downhole.

The lower end of the lower pump barrel is provided with a screen tube.

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

The upper pump plunger reciprocates along with the sucker rod.

The diameter of the lower pump plunger matches the inner diameter of the lower pump barrel.

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

The oil pumping method of the pre-set oil well pump with double pump barrels in the well, the specific steps are:

When oil is pumped, the liquid enters the oil pipe from the oil jacket annulus. After the lower oil pipe is filled with liquid, the upper pump plunger moves back and forth with the sucker rod, and the liquid will be lifted to the ground through the upper pump barrel; After the time wears down, lower the sucker rod, the plunger of the lower pump enters the lower pump barrel, and continue to pump oil normally.

The beneficial effects of the present invention are:

By transforming the waste materials in the oil field, the present invention designs a combined structure of downhole preset oil pumping pumps in which two upper and lower tubular pumps are connected in series. When the upper pump barrel fails, no workover is required, and the lower pump barrel can continue to work to pump oil. The pump inspection period of the oil well is prolonged, the workload of the pump inspection is reduced, and the production cost is reduced.

The present invention relates to a pre-installed oil well pump with dual pump barrels, that is, the dual pump technology is adopted, and the existing conventional tubular pump in the oil field is used for reconstruction. One pump works normally, and the other oil well pump is pre-placed in the well until the upper pump is worn out. Continue to work after leakage to extend the pump inspection cycle and reduce the workload.

Further description will be given below in conjunction with the accompanying drawings.

Description of drawings

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

FIG. 2 is a schematic structural diagram of the present invention when the lower pump is pumping oil.

In the figure, the reference signs are: 1, eccentric valve; 2, lower pump plunger; 3, upper pump plunger; 4, lower pump barrel; 5, upper pump barrel; 6, oil pipe; 7, sucker rod; 8 , Screen tube; 9. Wire plug.

Detailed ways

Example 1:

In order to overcome the existing problems of short pump inspection cycle and high pump inspection operation times without affecting the oil pumping work, the present invention provides an underground double pump barrel preset oil pump as shown in FIG. 1 and FIG. In the oil pumping method, the double-barrel preset oil pump is divided into two upper and lower pump barrels, and the upper and lower pumps share one sucker rod. The upper pump has an eccentric valve, which becomes an eccentric valve tubular pump. After the eccentric valve tubular pump is worn for a certain period of time, the sucker rod is lowered so that the lower pump plunger enters the lower pump barrel and continues to pump oil normally. The invention can greatly reduce the number of wells lost by the pump, reduce the number of pump inspection operations per year in the oil field, and prolong the pump inspection period without affecting the sucker rod for pumping oil.

Downhole double pump barrel preset oil pump, including eccentric valve 1, lower pump plunger 2, upper pump plunger 3, lower pump barrel 4, upper pump barrel 5, oil pipe 6 and sucker rod 7; the lower end of the oil pipe 6 Connected with the upper pump barrel 5 and the lower pump barrel 4 in turn, the lower end of the upper pump barrel 5 is provided with an eccentric valve 1; the sucker rod 7 is located in the oil pipe 6, and the lower pump plunger 2 is connected with the sucker rod 7 , the lower pump plunger 2 is located above the lower pump barrel 4 , the upper pump plunger 3 is connected with the sucker rod 7 and is located above the upper pump barrel 5 .

As shown in Figures 1 and 2, when the present invention works: when oil is pumped, the liquid enters the oil pipe 6 from the oil jacket annulus, and after the lower oil pipe is filled with liquid, the upper pump plunger 3 reciprocates with the sucker rod 7, The liquid will be lifted to the ground through the upper pump barrel 5; after the upper pump barrel 5 has been pumping oil for a certain period of time, the sucker rod 7 is lowered, and the lower pump plunger 2 enters the lower pump barrel 4, and continues to pump oil normally.

The double-barrel preset oil pump is divided into upper and lower pump barrels. The lower end of the upper pump barrel 5 is provided with an eccentric valve 1. The upper pump barrel 5, the eccentric valve 1, the upper pump plunger 3 and the sucker rod 7 form the upper pump and the lower pump. The barrel 4, the lower pump plunger 2 and the sucker rod 7 form the lower pump; the upper and lower pumps share one sucker rod 7. The upper pump has an eccentric valve 1, which becomes an eccentric valve tubular pump, and the lower pump is a tubular pump. After the eccentric valve tubular pump has been pumping oil for a certain period of time, the sucker rod is lowered, so that the lower pump plunger 2 enters the lower pump barrel 4. Continue to pump normally. The present invention adopts dual-pump technology and uses the existing conventional tubular pumps in the oil field to be transformed. One of the pumps works normally, and the other is pre-placed in the well, and continues to work after the upper pump is worn and lost. The present invention ensures the normal operation of the pumping. Under the premise of extending the pump inspection cycle, reducing the workload.

The present invention designs a combination structure of downhole pre-set oil well pumping pump with two upper and lower tubular pumps connected in series by transforming the waste materials in the oil field. When the upper pump barrel 5 fails, there is no need for workover, and the lower pump barrel 4 can continue to work to pump oil. The pump inspection period of the oil well is prolonged, the workload of the pump inspection is reduced, and the production cost is reduced.

Example 2:

Based on Embodiment 1, in this embodiment, preferably, the upper pump cylinder 5 and the lower pump cylinder 4 have the same structure, and the lower pump cylinder 4 is preset downhole.

Preferably, the lower end of the lower pump cylinder 4 is provided with a screen tube 8 .

Preferably, a wire plug 9 is provided at the lower end of the screen tube 8 .

Preferably, the upper pump plunger 3 reciprocates along with the sucker rod 7 .

Preferably, the diameter of the lower pump plunger 2 matches the inner diameter of the lower pump barrel 4 .

Preferably, the lower pump plunger 2 is in contact with the inner wall of the lower pump barrel 4 .

The oil pumping method of the pre-set oil well pump with double pump barrels in the well, the specific steps are:

When oil is pumped, the liquid enters the oil pipe 6 from the oil jacket annulus. After the lower oil pipe is filled with liquid, the upper pump plunger 3 reciprocates with the sucker rod 7, and the liquid will be lifted to the ground through the upper pump barrel 5; After the cylinder 5 is worn for a certain period of time, the sucker rod 7 is lowered, and the lower pump plunger 2 enters the lower pump cylinder 4, and continues to pump oil normally.

In the present invention, the lower end of the upper pump barrel 5 is provided with an eccentric valve 1, that is, the part of the ordinary tubular pump that fixes the valve fault in the well workover is changed to an eccentric bottom valve 1. When oil is pumped, the liquid enters the oil pipe 6 from the oil sleeve annulus, and waits for After the lower oil pipe is filled with liquid, the upper pump plunger 3 reciprocates with the sucker rod 7, and the liquid will be lifted to the ground through the upper eccentric valve tube pump. After the eccentric valve tube pump is worn for a certain period of time, the sucker rod 7 is lowered, and the lower pump plunger 2 enters the lower pump barrel 4, and continues to pump oil normally.

The downhole double pump barrel preset oil pump provided by the invention can greatly reduce the number of wells lost by the pump, reduce the number of pump inspection operations per year in the oil field, and prolong the pump inspection period.

The above examples are only examples of the present invention, and do not constitute a limitation on the protection scope of the present invention, and all designs that are identical or similar to the present invention belong to the protection scope of the present invention. Components and structures not described in detail in this embodiment belong to well-known components and common structures or common means in the industry, and will not be described one by one here.

Claims (8)

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.

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