SU1627751A1 - Method for lifting formation fluid and pumping plant - Google Patents

Description

The invention relates to the oil industry and is intended for use in a mechanized method of extracting fluid from wells by means of a well pumping unit.

The purpose of the invention is to increase the reliability of the column of rods due to the elimination of the longitudinal bending of the ep by creating tensile forces in the column of rods, as well as improving the working conditions during its dismantling.

On league. 1 is a diagram of an installation for lifting a liquid from a well, implementing the proposed method; in fig. 2 shows an installation option when using an auxiliary pump with a bypass channel; FIG. 3 shows an installation option when using an auxiliary pump with a rod located in the above plunger cavity.

The essence of the method of raising a reservoir fluid (Lig. 1) from well 1 by pump 2 consists in lowering the pump into the well. In this case, the pump cylinder 3 is fixed on the tubing string A, and the pump plunger 5 is mounted on the column of 6 hollow rods. As the column of the 6 hollow rods is lowered, their inner cavity 7 is filled with formation fluid. Next is the work

well pump cycle in which

during lifting of the plunger 5, the reservoir fluid rises to the surface through the inner cavity 8 of the column of pump-compressor pipes 4 and flows into the cylinder 3 of the pump, and when the plunger 5 is removed, the reservoir fluid flows from the bottom of the cavity 9 of the cylinder 3 of the pump to its supra plunger cavity 10.

Improving the reliability of column 6 of the rods is achieved by eliminating its longitudinal bending by creating tensile forces in the column of rods, which is accomplished by sealing the internal cavity 7 of the rod columns and injecting a double-flow pump 2 at each double stroke of the plunger 5. The pressure of the latter provides for the creation of a tensile force exceeding the sum of the friction forces acting on the column of rods during downward motion and compressing it. This eliminates buckling of the column of rods under the action of longitudinal forces compressing the column.

The installation for lifting fluid from the well 1 (FIG. 1) contains a well pumping pump 2, the cylinder 3 of which is suspended on a string of pump-compressor pipes 4. Auxiliary pump 11 is installed above the well pump, the cylinder 12 of which is rigidly connected to the column 6 hollow rods, and the plunger 13 is rigidly connected to the rod 14 with the plunger 5 of the downhole pump 2 The cylinder 12 of the auxiliary pump is made with a shoulder 15 located in the lower part of its outer surface. The rod 14 is provided with a limiter 16 of the stroke of the plunger 13 of the auxiliary pump 11, which is designed to interact in the lowest position with the shoulder 15. In the upper part of the cylinder 12 of the auxiliary pump, the suction 17 and the pressure 18 valves are installed.

The working chamber 19 of the auxiliary pump is formed by a cylinder 12 and a plunger 13. Through the expansion valve 10

20

25

An 17 it connects with the internal cavity 8 of the tubing 4, and through the pressure valve 18 - with the internal cavity 7 cone 6 hollow rods. Above the auxiliary pump 11 there is a fluid discharge unit 20, made in the form of a radial hole 21, tightly blocked by a membrane 22. A tight plug 23 is installed in the upper part of the column of hollow rods connected to solid rods 24. The upper rod is connected to a reciprocating actuator -) 5 movement of the column (not shown) „

The liquid discharge unit 20 (FIG. 2 3) can be made in the form of a radial hole 21 in the body of the liquid drain, hermetically sealed by a plunger 25 with a through axial channel located inside the rod. Plunger 25 is connected by a flexible element 26 (for example, a cord) with a plug 23 .

A constructive variant of the auxiliary pump (Fig. 2) contains a cylinder 27, equipped with a bypass channel 28, which hydraulically connects the working sub plunger chamber of the cylinder 29 with the rod cavity 7 through the discharge valve 18 and with the tubing cavity 8 through the suction valve 17.

A constructive variant of the auxiliary pump (Fig. 3) contains a cylinder 30, provided with a bypass channel 31, the rod 32 connecting the plunger 5 of the borehole pump and the plunger 33 of the auxiliary pump are shaped and located in the above plunger chamber 34 of the cylinder 30.

Installation for lifting fluid from the well works as follows.

When the column 6 rods move, the plunger 5 of the downhole pump 2 is in its lowest position at the initial moment, and the plunger 13 of the auxiliary pump 11 is in the extreme upper. As the rods rise, the plunger 13 moves downwards relative to the cylinder 12 until it reaches the position fixed limiter 15, after which upward movement of the plunger 5. of the borehole pump begins; "When the plunger 13 is moved relative to the cylinder 12, the working chamber 35 is filled

thirty

40

45

50

55

five

five

19 auxiliary pump, and when the plunger 5 of the borehole pump moves - flow of reservoir fluid from the sub-plunger cavity 9 into the pre-plunger cavity 10 "

When the rod string moves downward, the cylinder 12 of the auxiliary pump moves downwards relative to the plunger 13, and the plunger 5 of the downhole pump - relative to the cylinder 3 ". As a result, into the internal cavity

7 columns 6 rods are supplied with formation fluid. The reservoir fluid is lifted along the column 6 of tubing and filling the sub-plunger space 9. The existing

on the rod 6, during its downward movement, compressive forces due to the friction forces of the pair of plunger-cylinder rods about the reservoir fluid, as well as the forces caused by hydrodynamic losses in the discharge valve, are compensated by tensile force from the presence of overpressure rods in the internal cavity. the possibility of loss of stability of the column rods.

When using a constructive variant of an auxiliary pump (Figs 2 and 3), the injection of formation fluid from the cavity 8 of pump-compressor pipes into the cavity 7 of the rods occurs when the column 6 moves upwards. During this period of movement, the liquid from the subplate chamber 29 through the discharge valve 18 is displaced along the bypass channel into the cavity of the rods. Filling the chamber 29 occurs when the rod 6 down through the suction valve 17.

The rise of the downhole pump 2 is carried out as follows.

After removing the solid rods 24 to the surface, the plug 23 is removed. In the case of the installation shown in FIG. 1, an overpressure is created in the inner cavity 7 of the rods by a special pump (not shown) ensuring the destruction of the diaphragm 22. As the boom string continues to be lifted, the fluid filling them is drained through the opening 21. In the case of the installation shown in FIG. 2 and 3, after the plug 23 is removed, the plunger 25 is removed by a cable 26. As a result, the cavity 7 of the rods communicates with the cavity

8 columns of tubing,

and fluid flows out through the hole 21.

0

0

five

0

five

Claims (8)

1. A method of raising a reservoir fluid from a well by a sucker-rod pump, consisting in lowering the pump into the well when securing the pump cylinder on the tubing, and plunger on a column of hollow rods, filling the inner cavity of the rods with fluid, raising the plunger, while lifting the reservoir fluid to the surface through the inner cavity of the tubing string and the suction of the fluid into the pump cylinder, after which the plunger is lowered, carrying out the flow of the reservoir fluid from the sub-plunger cavity Indra pump into its supra plunger cavity, characterized in that, in order to increase the reliability of the rod column by eliminating its buckling by creating a stretching force in the rod column, the internal cavity of the rod column is sealed and the reservoir is injected into it at each double plunger stroke. a pressurized fluid to create a stretching force, exceeding the sum of the friction forces acting on the rod string as it goes down. 2. Pump unit for lifting reservoir fluid from a well, including a surface reciprocating drive, a tubing string, a well pump, an auxiliary pump mounted above it, containing a plunger located in the cylinder to form a working chamber, suction and discharge valves , a hollow column, the plunger of the auxiliary pump is rigidly connected to the plunger of the borehole pump, and the cylinder of the auxiliary pump with valves installed in it is rigidly connected to the hollow rods, l and m of h and Yu-u and in that, in order to increase the reliability of rod string by eliminating its buckling PU 0 five 0 five 0 five 0 five 0 By creating an extension force in the column of rods, the working chamber of the auxiliary pump is connected to the internal cavity of the tubing through the suction valve and through the discharge valve to the internal cavity of the rod string, and the diameter of the auxiliary pump plunger is smaller than the internal diameter of the rod string. 3. Installation according to p0 2, that is, so that the cylinder of the auxiliary pump is made with the outer collar and the plunger of the submersible pump is equipped with a travel stop with the ability to interact with the collar of the cylinder of the auxiliary pump 4C Installation according to clause 2, which means that the cylinder of the auxiliary pump is equipped with a bypass channel that hydraulically connects its working chamber with the rod cavity through the discharge valve. 5o The installation according to claim 4, about which the rod connecting the plungers of the borehole and auxiliary pumps is placed in the pre-plunger chamber of the auxiliary pump. 6 o The installation according to claim 2, characterized in that, in order to improve the working conditions during the dismantling of the rod string, a fluid discharge unit is installed in the column of hollow rods above the discharge valve of the auxiliary pump. 7. The installation as claimed in claim 6, wherein the fluid discharge unit is designed as a radial opening in a hollow rod, hermetically sealed by a plunger located inside the rod with a through axial channel connected by a flexible element, such as a cable, the top of the hollow rod column is about 8. Installation according to claim 6, characterized in that the fluid discharge unit is in the form of an opening n hollow rod, tightly blocked by a membrane. E2l Fig.Z