RU1803528C - Device for sealing mouth of well - Google Patents

Abstract

Usage: the field of oil production, namely, a device for sealing the mouth when using sucker rod pumping units (SHGNU). The aim of the invention is to increase the efficiency of the device due to the possibility of reducing leaks and shock loads. The invention relates to the field of oil production, and in particular to devices for sealing the mouth when using sucker-rod sucker-rod installations. The aim of the invention is to increase the efficiency of the device due to the possibility of reducing leakage and shock loads during well operation with well operation using long-stroke well pumping units. The inventive device for sealing the wellhead comprises a cylinder and a flexible pulling element (rope) made with a piston, a sleeve with pivotally mounted spring levers, a spring-loaded piston rod with an axial and two rows of radial channels and an annular protrusion on the outer surface, reverse valve installed in the axial hydraulic channel. When moving up, the levers fall into the bore. The housing is fixedly fixed relative to the cylinder. At the same time, the piston rod continues to move upward and displaces the fluid from the sealed cavity along the radial and axial channels, through the check valve into the sub-piston space. During downward movement, the levers come out of the bore and the cavity is depressurized. It begins to fill with liquid, which appeared due to leaks in the gap between the piston and the cylinder. 2 ill. 00 about with SL hO 00 using long-stroke borehole pumping units. The invention is illustrated in Figs showing an apparatus for sealing a wellhead. In FIG. 1 shows the device in its lowest position; in FIG. 2nd upper working position. The device contains an insulating cylinder (1) with a sleeve located inside it

Description

koi t) with spring-loaded levers (3) pivotally mounted in its upper part. a spring-loaded piston rod (4) with an axial (5) and two rows of radial channels (6) and an annular protrusion (7) on the outer surface, while the spring-loaded piston rod (4) is concentrically mounted in the sleeve (2) and connected one end with a flexible organ (8), and the other with a piston (9) and a check valve (10) located in its axial channel (5). The cylinder (1) is made with an annular bore (11) on the inner surface. When the spring-loaded levers (3) are fixed in the annular bore (11), a sealed cavity (12) is formed under the annular protrusion (7), which hydraulically communicates with the under-piston space (13).

The proposed device operates as follows. When moving upward in a certain position of the piston (9), the spring-loaded levers (3) fall into the annular bore (11). In this case, the sleeve (2) is fixed motionless relative to the insulating cylinder (1), and the spring-loaded piston rod (4) continues to move upward and the annular protrusion (7) displaces the liquid from the sealed cavity (12) along two radial rows (6) and axial (5) channels, through a check valve (10), into the under-piston space (13). During the downward stroke, the spring-loaded levers (3) come out of the annular bore (11), in this case, the sleeve (2) is depressed, accompanied by the depressurization of the cavity (12), and its filling begins with liquid, which appeared due to leaks in the gap between the piston (9) and cylinder (1). Filling occurs through an annular channel formed between the piston rod (4) and the sleeve (2). Cavity Filling (12)

fluid occurs throughout the entire piston stroke down and most of the stroke up, pumping out of fluid leaks begins after the spring-loaded levers (3) are fixed in the annular bore (11) and the cavity (12) is sealed.

The use of the claimed invention will allow significantly (at least 5 times) by reducing leakage to increase the efficiency of the sealing device of the wellhead for stroke lengths exceeding 15 m.

Claims (1)

SUMMARY OF THE INVENTION Device for sealing a mouth wells containing an insulating cylinder and a flexible pull member with a piston, characterized in that, in order to increase the efficiency of the device due to the possibility of reducing leakage and shock loads during well operation using long-stroke borehole pumping units, it is equipped with a sleeve located inside the insulating cylinder with spring-loaded levers pivotally mounted in its upper part, a spring-loaded piston rod with an axial and two rows of radial channels and with an annular protrusion on the outer surface mounted concentrically in the sleeve and connected at one end with a flexible pull member, and the other with a piston and a piston rod placed in the axial channel under its upper radial channels through the check valve, while the cylinder is made with an annular bore on the inner surface, and the sleeve cavity under the annular protrusion of the piston rod is hydraulically connected to the space of the insulating cylinder under the piston when placing the spring levers in the annular bore of the cylinder. Riga d.