RU2299978C1 - Pumping plant for simultaneous oil production and depression-wave bottomhole formation zone treatment - Google Patents

Abstract

FIELD: oil production, particularly enhanced recovery methods for obtaining hydrocarbons by repressuring or vacuum methods.

SUBSTANCE: pumping plant comprises pump cylinder assembly composed of two cylinders having different diameters and connected with each other so that cylinder with greater diameter is located over that having smaller diameter. Cylinder with smaller diameter has orifices made in central part thereof and is provided with spring-loaded valve connected to settler container. Settler container has orifices in upper part thereof. Pump piston assembly comprises two pistons. Upper piston is located in cylinder with greater diameter and is connected to elongated sealed piston through hollow sub with inlet orifices. The elongated sealed piston is located in cylinder with smaller diameter. Cylinder with greater diameter is connected to flow string. Upper piston is fastened to rod stem.

EFFECT: possibility of bottomhole formation zone treatment by implosion action application along with oil production and contaminant collecting from bottomhole formation zone in specially adapted settler.

2 dwg

Description

The invention relates to the oil industry and may find application in oil production and simultaneous local depression-wave processing of the bottom-hole formation zone.

A pump is known, which includes a cylinder and a hollow differential plunger with a discharge valve, a smaller cross section of which forms an annular cavity with the cylinder, is equipped with a suction valve and a through radial channel. The differential plunger is equipped with a partition separating the larger and smaller sections of the cavity, and a through channel communicating the cavity of a larger section with a ring cavity. The use of the pump allows a high-quality implosive effect on the well and pumping out the wellbore fluid without changing equipment, but only changing the suspension point of the rod string (RF Patent 2138687, CL ЕВВ 47/00, publ. 1999.09.27).

The well-known pump is not efficient enough in conditions of severe contamination of the well with formation products.

Closest to the proposed invention in technical essence is a device for oil production, including a cylinder, in which a plunger with a discharge valve is located. At the ends of the cylinder, extension nipples with end couplings, a suction valve and a plunger stop are installed. The suction valve is located on the side of the outside of the plunger. The extension nipple in the lower end part is equipped with a garbage collector with a plug. In the upper part of the cylinder, a hole is made, connected with the annulus, located at a greater distance from the plunger stop than the length of the plunger. The device has a filter equipped with a bottom and a cover with corresponding holes for the lower sealing nipple. The filter element is made in the form of a removable frame tetrahedron with a filter mesh. A groove for a removable filter element is provided on the bottom of the housing. A hole was made on the housing cover for the holder of the seat of the suction valve (RF Patent No. 2157450, class ЕВВ 43/00, publ. 2000.10.10 - prototype).

The known device collects garbage in the lower part and delivers upward liquid without pollution, which increases the efficiency of the device in conditions of severe contamination of the well with formation products. However, the device does not have an implosive effect on the bottom-hole zone of the formation and does not allow oil production while cleaning the bottom-hole zone and the collection of contaminants on the bottom of the well.

The proposed device solves the problem of simultaneous cleaning of the bottomhole zone with implosion, oil production and the collection of contaminants at the bottom of the well in a special sump.

The problem is solved in that the pumping unit for simultaneous oil production and local depressive wave processing of the bottom-hole formation zone, including a pump cylinder with a side suction valve, a pump plunger with a discharge valve and a settling tank, according to the invention, has a pump cylinder made up of two connected between each other cylinders of different diameters, larger on top and smaller on the bottom, a side suction valve attached to a larger cylinder in its lower part, the smaller cylinder in the middle part is provided with In the lower part it is equipped with a reversed spring-loaded valve to which a settling tank is attached, having openings in the upper part, the pump plunger is made up of two plungers, the upper one is placed in a larger cylinder and connected to an elongated plugged plunger located in a smaller cylinder, with the larger cylinder attached to the tubing string and the upper plunger to the boom string.

SUMMARY OF THE INVENTION

Known devices for oil production allow producing oil and collecting pollution or producing oil and carry out implosion treatment of the bottom-hole formation zone. The proposed device solves the problem of simultaneously producing oil, performing implosion treatment of the bottomhole formation zone and collecting pollution. The problem is solved by the claimed device.

Figure 1 presents the claimed pumping unit with the lowest position of the plungers; figure 2 presents the claimed pumping unit with the extreme upper position of the plungers.

A pumping unit for simultaneous oil production and local depressive-wave treatment of the bottom-hole formation zone includes a pump cylinder composed of two cylinders of different diameters connected to each other, greater than 1 from above with pressure valve 2 and less than 3 from below. A side suction valve 4 with a filter 5 is connected to a larger cylinder 1 in its lower part. The smaller cylinder 3 in the middle part is provided with holes 6, in the lower part it is provided with an inverted spring-loaded valve 7 to which a pipe 8 and a settling container 9 are attached, having openings 10 in the upper part. The pump plunger is composed of two plungers, the upper plunger 11 is placed in the larger cylinder 1 and through the hollow sub 12 with the inlet 13 is connected to an elongated blanked plunger 14 located in the smaller cylinder 3. The larger cylinder 1 is connected to the tubing string 15 and the upper plunger 11 - to the rod string 16. The installation is placed in the casing 17 of the well with the location of the holes 6 opposite the perforation holes 18 of the reservoir.

A pump installation for simultaneous oil production and local depressive-wave processing of the bottom-hole formation zone works as follows.

When the column string 16 and the plungers 11 and 14 upward from the lowermost position (Fig. 1), the discharge valve 2 is closed. The fluid is supplied to the tubing string 15. A vacuum is created under the plunger 11. The side suction valve 4 opens and the fluid through the filter 5 under pressure of the reservoir enters the annular space between the surface of the plunger 14 and the inner surface of the cylinder 1. At the same time, the reverse spring-loaded valve 7 is closed at the bottom of the pump unit, a vacuum depression is created under the plunger 14. When the plunger passes 14 holes 6 into the cylinder 3, liquid instantly bursts into the rarefied space. In this case, water hammer and local depression arise, which, in turn, create a short-term implosion state and wave impulse with a wide range of frequencies and amplitudes.

When the column string 16 and the plungers 11 and 14 from the extreme upper position (Fig. 2) downward, the discharge valve 2 of the plunger 11 opens, and the side suction valve 4 closes under the pressure of the liquid under the plunger 11 and the liquid passes through the inlets 13 in the hollow sub 12 and the hollow plunger 11 fills the plunger 11. In the lower part of the pump installation, the muffled plunger 14 expels the liquid from the cylinder 3 through the pipe 8 into the settling tank 9, where the sedimentation of contaminants and the outlet through the holes 10 of the settled Liquids in the well space bounded by the casing 17.

The ratio of the inner diameters of the larger 1 and smaller 3 cylinders of the pump allows you to adjust the ratio of the volume of liquid supplied upward, as produced and the volume of liquid sent to clean up contaminants. The length of the plunger 14, its diameter and the height of the hole 6 adjust the intensity of the implosive effect on the bottomhole formation zone.

The use of the proposed pump unit will allow simultaneously cleaning the bottom-hole zone with implosion, extracting oil and collecting pollution at the bottom of the well in a special sump.

Claims (1)

A pumping unit for simultaneous oil production and local depressive wave processing of the bottomhole formation zone, including a pump cylinder with a side suction valve, a pump plunger with a discharge valve and a settling tank, characterized in that it has a pump cylinder made up of two interconnected cylinders of different diameters, larger on the top and smaller on the bottom, the side suction valve is connected to the larger cylinder in its lower part, the smaller cylinder in the middle part is equipped with holes in the lower part equipped with a reversed spring-loaded valve to which a settling container is attached having openings in the upper part, the pump plunger is made up of two plungers, the upper one is placed in a larger cylinder and connected to an elongated plugged plunger located in a smaller cylinder through a hollow sub with inlet openings the larger cylinder is attached to the tubing string, and the upper plunger to the boom string.

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