RU2350784C1 - Rod sub-surface pump with side aperture in cylinder plugged with hydraulic overflow valve - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: pump consists of cylinder with side aperture, of elongating sleeves, of suction valve with valve pair, of plunger of assembled structure with connected thereto unit of pressurising valve. The cylinder of the rod pump is equipped with a device leak proof closing the aperture in the point of aperture location. The device consists of two half-rings connected with screws; an aperture of alternate cross section is made in one of the half-rings; this aperture is co-axial to the side aperture in the cylinder body. It has the interior thread in the portion of bigger section and is plugged with a disrupted element in form of a membrane fixed in the aperture with a nut. The latter has an exterior thread. When there is necessity to drain water off from the pump-compressor pipe column, the disruptive element is destructed by means of high pressure in the cavity of pump cylinder.

EFFECT: preventing flow of liquid via overflow aperture during operation of rod sub-surface pump in well, which allows increasing delivery rate of rod sub-surface pump.

4 dwg

Description

The present invention relates to the oil industry and can be used as part of downhole sucker rod pump units (SSHNU).

A well-known sucker-rod suction pump of a pipe construction, consisting of a cylinder with a side opening, extension pipes connected to it, attached to a lower extension pipe of a suction valve with a valve pair of an enlarged non-removable structure, a long assembly plunger with a discharge valve assembly attached to it. (OAO Izhneftemash, Deep sucker-rod pumps. Catalog, rev. 2-2001, p. 35).

The design drawback of this pump is the presence of a side drain hole in the cylinder body, which makes it impossible to conduct a preliminary hydraulic test of this sucker rod pump before being sent to the well, a large amount of leakage through the side drain hole during its operation, as well as the likelihood of a sticking of the piston rod pump in the cylinder when it operation due to ingress of foreign mechanical impurities in the gap between the plunger and the cylinder.

The technical task of the present invention is to increase the reliability and operating efficiency of downhole pumping equipment.

This task is achieved by the fact that in a sucker-rod sucker-rod pump of a pipe construction consisting of a cylinder with a side opening, extension pipes connected to it, attached to a lower extension pipe of a suction valve with an enlarged valve pair of an enlarged size, a long assembly plunger with a unit attached to it discharge valve, the rod pump cylinder at the location of the hole is equipped with a device that seals the hole and consists of two half-rings C, connected by screws, with a hole of variable cross-section made in one of the half rings, located coaxially to the side hole in the cylinder body, having an internal thread in a part having a larger cross section, and sealed by a bursting element in the form of a membrane, fixed in the hole by a nut having an external thread, and when it becomes necessary to drain the fluid from the tubing string, destructible by creating high pressure in the cylinder cavity of the sucker rod pump.

Figure 1 shows the cylinder of a sucker rod pump with a side hole plugged by a hydraulic drain valve, complete in section; figure 2 is a long plunger of prefabricated assembly in section; figure 3 is a frontal section of the cylinder of the sucker rod pump at the location of the hydraulic drain valve; figure 4 is an enlarged view of the hydraulic drain valve assembly mounted on the cylinder of the sucker rod pump.

The design of the sucker rod pump consists of a cylinder 1 (Fig. 1) with a lateral drain hole connected to it on both sides by threaded connections of the extension pipes 3 (Fig. 1), connected by a threaded connection to the lower extension pipe of the enlarged suction valve assembly 4 (FIG. 1) of a non-removable assembly assembly, a long plunger of a prefabricated structure 5 (FIG. 2) attached to it from below by means of a threaded connection of the discharge valve assembly 6 (FIG. 2), and also mounted on the cylinder head of the hydraulic drain valve 2 (Fig. 1), consisting of a rear half-ring 8 (Fig. 3), a front half-ring 9 (Fig. 3), in which there is a hole with a variable cross-section, in the part of which, having a larger size, the inner thread. In this hole, at the transition from the larger to the smaller section, the discontinuous element of the hydraulic valve is installed in the form of a membrane 10 (Fig. 3), the thickness of which determines the critical pressure of the hydraulic valve, above which the membrane ruptures, thus opening the hole, through which liquid is drained from the inner cavity of the tubing string when it is lifted during underground well repair. The bursting element is fixed in the hole with a nut 12 (Fig. 3) having an external thread, to prevent leaks through the plugged hole when the pump is operating in the well, a rubber seal ring 14 is installed under the diaphragm (Fig. 3). A non-through slot 13 (Fig. 4) with a width exceeding the diameter of the side hole in the pump cylinder was made along the inner surface of the semicircles at the location of the hole with a variable cross section around the entire circumference to provide a message for the hole in the cylinder cavity of the sucker rod pump through the lateral drain hole 15 (Fig. .4), in which the critical pressure is created to destroy the bursting element, with a variable-section opening of a hydraulic drain valve, in which yvnoy element Accidental displacement hydraulic drain valve with respect to the lateral opening in the cylinder body. The half rings 8 and 9 (Fig. 3) are fixed on the cylinder body with screws 11.

New is the use in the design of a sucker rod pump with a lateral drain hole in the cylinder of a hydraulic drain valve mounted on the cylinder body along the lateral hole, which helps prevent foreign particles from entering the gap of the cylinder-plunger pair, as well as prevent leakage through the lateral hole when operation of a sucker rod pump in a well.

The operation of this sucker rod pump is as follows. After lowering the sucker rod pump into the well, fitting is performed. When fitting, the plunger is lowered until the pressure valve touches the suction valve. After that, the plunger is lifted to a certain height (200 mm), taking into account the extension of the rods, then the required stroke length of the polished rod of the pumping unit is set, not exceeding the maximum stroke length of the rod pump lowered into the well, after which the SSHN is put into operation. If it is necessary to drain the fluid from the inner cavity of the tubing string when lifting the oil well from the well, the plunger of the sucker rod pump is removed from the cylinder or lowered against the suction valve assembly, then pressure is created in the inner cavity of the cylinder of the sucker rod pump exceeding the critical value of fracture of the bursting element, which leads to its rupture, thus opening a hole through which the liquid is drained when the GNO is raised. If it becomes necessary to reuse this hydraulic drain valve, the locking nut 12 (Fig. 3) is unscrewed, the destroyed bursting membrane element is replaced with a new one, after which the locking nut is replaced.

The proposed change in the design of the sucker rod pump with a lateral drain hole in the cylinder will prevent jamming of the “cylinder-plunger” pair of the sucker rod pump due to mechanical particles entering the gap of the “cylinder-plunger” pair from the annulus through the side hole in the cylinder and will also prevent fluid leakage through the lateral drain hole during operation of the sucker rod pump in the well, which will thereby increase the sucker rod feed rate th pump. It will also provide the possibility of preliminary hydraulic testing of the cylinder of the sucker rod pump assembly in the condition of the repair facilities of the oil well before sending the sucker rod pump to the well, which will allow to reject the components and parts of the ShGN cylinder that do not provide the necessary tightness of the ShGN, thereby preventing the entry of the defective deep-well pump equipment in the wells and eliminating the need for repeated underground repairs to replace defective downhole pumping equipment.

Claims (1)

A sucker-rod sucker-rod pump, consisting of a cylinder with a side opening, extension pipes connected to it, attached to a lower extension pipe of a suction valve with a valve pair of an enlarged non-removable structure, a long assembly plunger with a discharge valve assembly attached to it, characterized in that the cylinder of the sucker rod pump at the location of the hole is equipped with a device that seals the hole and consists of two half rings connected screws, with a hole of variable cross section made in one of the half rings, aligned with the side hole in the cylinder body, having an internal thread in a part having a larger cross section, and sealed with a bursting element in the form of a membrane, fixed in the hole with a nut having an external thread, and when it becomes necessary to drain the liquid from the tubing string by destructible by creating high pressure in the cylinder cavity of the sucker rod pump.

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