RU2815990C1 - Device for washing valve units of sucker-rod pumps - Google Patents

Abstract

FIELD: oil industry.

SUBSTANCE: invention is intended for use in oil industry in installations of sucker-rod pumps, namely for flushing of valve units. Device for flushing of valve units of sucker-rod pumps comprises top sub 1, lower housing 2, bottom sub 3, top bushing 5 with channels, and rod 6 with through hole. In the lower part of rod 6 there is a suction valve assembly, cage 7 and ball 8 of which are installed inside the through hole of rod 6, saddle holder 9 with a through hole. Tip 4 is installed in bushing 5. Upper housing 10 is connected to sub 1 and housing 2. Housing 10 forms with rod 6 upper and lower chambers 11 and 12. Housing 10 comprises channels 13. Rod 6 has holes 14. Coupling 15 connects rod 6 and saddle holder 9, between which saddle 16 is located. Coupling 15 rests on spring 17, the second end of which rests on housing 2. Sub 3 comprises lower bushing 18 with holes, in which rod 19 is installed. Saddle holder 9 in its through hole contains middle bushing 20 with holes, through which rod 19 passes.

EFFECT: invention is aimed at maintaining serviceable state of sucker-rod pumps.

1 cl, 2 dwg

Description

The invention is intended for use in the oil industry in installations of sucker rod deep-well pipe and insertion pumps, namely for flushing the suction and discharge valve assemblies in installations of sucker rod deep-well pipe and insertion pumps.

During the operation of wells, the valve assemblies of sucker rod pump installations often become clogged with various mechanical impurities, asphalt, resin, paraffin deposits, proppant, etc. Also, during the operation of wells, the passage channel of the valve assembly of the sucker rod pump is incompletely closed due to the formation of a water-oil emulsion, which leads to failure supply of well fluid and the need to carry out work to restore operability using underground well repair (ORR).

There is a well-known well unit of an installation for washing tubing pipes from asphalt, resin, and paraffin deposits (RF patent No. 122689, IPC E21B 37/00, publication date 12/10/2012), containing a valve body 2, made in the form of a hollow cylinder, at the end sections of which there is a thread for embedding the unit into the tubing string - tubing 1. Radial holes 4 are made in the walls of the housing 2 for the flushing fluid to enter the cavity 5 of the annular space between the housing 2 and the casing pipe 6. Inside the housing 2 there is a shut-off block consisting of a rigidly fixed in the housing 2 of the hollow inner cylinder 7 and a spring system placed in the gap between the inner walls of the housing 2 and the outer walls of the hollow inner cylinder 7. The disadvantage of this unit is the impossibility of creating circulation between the pipe and annulus of the well.

The prototype can be a universal sucker rod pump (RF patent No. 102698, IPC F04B 47/00, publication date 03/10/2011), containing a cylinder 1 with a hollow plunger 2 placed in it with a rod 3 and a discharge valve 4, a suction valve 5. The pump is equipped with a drain valve, consisting of a cylindrical body 6 with a central side drain hole 7 and a removable hollow shut-off cylinder 8 located inside it, which form a plunger pair. The locking cylinder 8 is stationary and the rod 3 of the plunger 2 of the pump passes through it with the possibility of free movement of the rod 3 of the pump. The drain valve is installed through the tubing coupling 10 above the pump cylinder 1, and the suction valve 5 is made in the form of a flush valve, which consists of an elongated pipe 11, and inside it there is an internal cylinder 12 with a groove 13 and with holes 14 for the passage of liquid, a ball valve pair 15 for suction, located inside the inner cylinder 12, a pressure rod 16, located under the pressure rod 16 and connected to it by means of a thread, a pressure rail 17, on which a wedge 19 is attached by a hinge 18, an octagonal carriage 20 installed on top of the pressure rail 17 and inserted into the groove 13 of the inner cylinder 12. The pressure rod 16 is spring-loaded relative to the octagonal carriage 20 by a compression spring 21. The upper part of the pressure rod 16 is connected via a thread to a thrust washer 22, which has holes 23 for the passage of liquid. The upper end of the elongated pipe 11 is connected through a coupling 24 to the tubing, and its lower end is connected through a coupling 25 to the receiving housing 26 of the drain valve 6. The disadvantage of this device is its frequent clogging with deposits, which leads to the need to carry out work to restore functionality using PRS and, accordingly, in reducing the productivity of production wells.

The technical problem solved by the present invention is to increase the turnaround time of production wells.

The technical result of the present invention is to maintain the operating condition of the CPRP during the operation of oil-producing wells due to the possibility of carrying out resuscitation work on the suction and discharge valve units of the CPGP when they become clogged or the passage channel of the suction and discharge valve units is incompletely closed by performing: direct or reverse flushing, as well as creating circulation between the tubular and annulus of the well.

The technical result is achieved by using a device for flushing valve units of sucker rod pumps according to the present invention. The device contains an upper sub, a lower body, a lower sub, an upper bushing with channels, a rod with a through hole, a suction valve assembly is located in the lower part of the rod, the cage and ball of which are installed inside the through hole of the rod, a seat holder with a through hole, and the tip is installed in the upper bushing, the upper body is connected to the upper sub and the lower body, the upper body forms the upper and lower chambers with the rod, the upper body contains channels, the rod contains holes, the coupling connects the rod and the saddle holder, between which the saddle is placed, while the coupling rests on a spring, the second end of which rests on the lower body, the lower sub contains a lower bushing with holes into which the rod is installed, while the saddle holder in its passage hole contains a middle bushing with holes through which the rod passes.

In fig. Figure 1 shows a diagram of a device for flushing valve units (VCU) during the operation of wells equipped with a pressure-pulling unit.

In fig. Figure 2 shows a diagram of the control unit during resuscitation of suction and discharge valve units in wells equipped with a pressure-pulling pump, as well as when creating circulation between the pipe and annulus of the well.

The numbers on the figures indicate: 1 upper sub, 2 lower body, 3 lower sub, 4 tip, 5 upper bushing, 6 rod, 7 cage, 8 ball, 9 seat holder, 10 upper body, 11 upper chamber, 12 lower chamber, 13 channels , 14 holes, 15 coupling, 16 seat, 17 spring, 18 lower bushing, 19 rod, 20 middle bushing.

UPKU for USGP (Fig. 1) contains an upper sub 1, a lower housing 2, a lower sub 3, a tip 4 installed in the upper bushing 5, which has channels for supplying flushing fluid, a rod 6 with a through hole, a suction is located in the lower part of the rod 6 valve, cage 7 and ball 8 of which are installed inside the passage hole of the rod 6, seat holder 9 with a passage hole. The upper housing 10 is connected to the upper sub 1 and the lower housing 2. The upper housing 10 forms with the rod 6 the upper 11 and lower 12 chambers for moving the rod 6, while the upper housing 10 contains channels 13, the rod 6 contains holes 14, the coupling 15 connects the rod 6 and a saddle holder 9, between which a saddle 16 is placed. The coupling 15 rests on a spring 17, the second end of which rests on the lower body 2, the lower sub 3 is installed in the lower part of the lower body 2 and contains a lower sleeve 18 with holes, into which a rod 19 is installed In this case, the saddle holder 9 in its passage hole contains a middle sleeve 20 with a hole through which the said rod 19 passes.

The UPCU contains an upper chamber 11, which is located under the upper sub 1 and communicates with the annulus through channels 13 of the upper housing.

The UPCU contains a lower chamber 12, which communicates with the pipe space through holes 14 of the rod 6.

During operation of the USGP, the pressure of the liquid column located in the tubing string acts on the rod 6, which tends to move the rod 6 down. To balance the above pressure: holes 14 are made on the rod 6, a lower chamber 12 is located between the rod 6 and the upper body 10.

The upper 11 and lower 12 chambers provide balancing of the pressure of the flushing liquid column acting on the rod 6, and the ability to move the rod 6 from the transport to the working position and from the working to the transport position.

According to the present invention, the UPCU is lowered into the well as part of a coal pumping unit, while the UPCU is in the transport position. If necessary, the required equipment is mounted on the UPCU in the lower part (not shown in the figure). The USP is put into operation in the same way as the USP of all modifications.

If there is no supply of produced fluid due to clogging or incomplete closure of the passage channel of the suction and discharge valve units, the insert pump is resuscitated using the device according to the present invention as follows.

The USHGN plunger is unloaded on the UPCU (Fig. 2) as follows: the tip 4, the upper sleeve 5, the rod 6 are moved down, and the volume of the upper chamber 11, filled with liquid from the annulus, increases.

The tip 4 lifts the ball (not shown in the figure) of the discharge valve assembly and the forced opening of the discharge valve assembly occurs. The rod 6 is fixedly connected to the coupling 15. Upon further unloading, the upper bushing 5 rests against the upper sub 1, the rod 6 moves the coupling 15 down, the spring 17 is compressed and the rod 19 lifts the ball 8 of the suction valve assembly and the suction valve assembly is forced to open. Thus, the UPCU according to the present invention is transferred to the working position.

Next, direct flushing is carried out: the flushing liquid is fed into the tubing, which enters through the open passage channel of the discharge valve assembly (not shown in the figure), through the holes of the upper bushing 5, the passage hole of the rod 6, the cage 7, the passage hole of the seat holder 9, the passage hole of the middle bushings 18 into the well and lift the flushing fluid through the annulus to the surface.

Thus, resuscitation work is carried out suction and discharge valve units of the UShGN, due to which the suction and discharge valve units are cleaned from contaminants.

If necessary, backflushing is carried out: flushing liquid is supplied through the annulus, which rises through the bore of the lower sub 3, the bore of the lower bushing 18, the bore of the seat holder 9, the bore of the middle bushing 20, the seat 16, the cage 7, the bore of the rod 6, the holes of the upper sleeve 5, the discharge valve assembly (not shown in the figure), then into the tubing and lift the flushing liquid to the surface. Thus, resuscitation work is carried out suction and discharge valve units of the UShGN, due to which the suction and discharge valve units are cleaned from

If it is necessary to carry out OPT to restore and/or increase oil recovery from the exploited formation, wells carry out direct injection of mixtures, acid compositions and compositions.

In the absence of load on the upper bushing 5, the pressure in the lower chamber 12, as well as the spring 17, will help move the rod 6 upward, and the volume of the upper chamber 11 decreases.

If necessary, it is possible to lift the UPCU according to the present invention together with the USP.

Claims (1)

A device for flushing valve units for sucker rod pumps, containing an upper sub, a lower body, a lower sub, an upper bushing with channels, a rod with a through hole, a suction valve unit is located in the lower part of the rod, the cage and ball of which are installed inside the through hole of the rod, a seat holder with a through hole, characterized in that the tip is installed in the upper sleeve, the upper body is connected to the upper sub and the lower body, the upper body forms the upper and lower chambers with the rod, the upper body contains channels, the rod contains holes, the coupling connects the rod and the seat holder, between which a saddle is placed, while the coupling rests on a spring, the second end of which rests on the lower body, the lower sub contains a lower bushing with holes into which the rod is installed, while the saddle holder in its passage hole contains a middle bushing with holes through which the rod passes.