RU184873U1 - UNIVERSAL GAS TRANSMISSION DEVICE FOR OPERATION OF SHGN - Google Patents

Abstract

The utility model relates to the oil and gas industry, namely, devices for transferring gas from the annulus of the well into the tubing string during operation of the sucker rod pump. A universal gas transfer device for operating a SHGN containing a tubing with a radial hole, a hollow piston with sealing cuffs, lower and upper gas transfer valves, consisting of a hollow body with an opening for the passage of liquid and gas, a shutter in the form of a ball placed in the saddle, characterized in that the hollow piston is placed on the rods above the pump plunger parallel to the tubing string, and the sealing cuffs are made of fluoroplastic. To transfer associated gas from the annulus to The tubing line is a universal gas transfer device located at a distance of 20-50 meters from the wellhead, and for flushing tubing from an ARPD, the valve is located 20-50 meters above the pump.

Description

The utility model relates to the oil and gas industry, namely, devices for transferring gas from the annulus of the well into the tubing string during operation of the sucker rod pump.

A known circulation valve for screw pumps, consisting of a fixed seat and a movable plate, made in the form of bushings and installed in the tubing coupling on circular rings (RF patent No. 46807 class IPC ЕВВ 34/06). The input of formation fluid to the valve and further into the tubing string is from the annulus through a series of holes in the coupling.

The disadvantages of this valve are:

- design complexity;

- design features of screw pumps and deep-well sucker rod pumps narrow the scope of the valve.

Closest to the proposed technical solution is a downhole valve device comprising a nozzle with a radial hole, a hollow body with a hole for the passage of fluid, a spring-loaded shutter, the shutter being made in the form of a ball placed in a saddle screwed into the valve body (RF patent No. 43302 cl. IPC E21B 34/06).

The disadvantages of this technical solution are:

- when liquid or gas enters the valve assembly from the annulus, the valve becomes clogged with debris and dirt;

- due to the significant protrusion of the valve body part relative to the tubing string and the location in the immediate vicinity of the wellhead, the conditions for passing through the annulus of geophysical instruments with an outer diameter of more than 28 mm such as Sova-3-28, RN- 28 ";

- increases the likelihood of an accident due to jamming and sticking of devices lowered on the cable;

- with a decrease in the flow rate of the well during processing of the bottom-hole zone of the formation, the conditions for passing the “flexible pipe” (coiled tubing) with an outer diameter of more than 25 mm are worsened;

- increases the likelihood of an accident due to jamming and sticking of the "flexible pipe" and its failure.

These prototypes narrow the scope and are not universal.

The objective of the proposed utility model is to increase the reliability of the gas transfer device, improve the conditions for the passage of geophysical instruments and other devices designed to study wells and treat the bottom-hole formation zone, ensure that preventive treatments of wells against the occurrence of asphalt-resin-paraffin deposits in the tubing and ensure annihilation of the annular gas the allocation of resins, paraffin, salts from the produced fluid, reducing annulus pressure on the production casing, ensuring trouble-free operation of the well and, as a result, an increase in the overhaul period.

The problem is solved as follows. Gas accumulated in the annulus is forcibly pumped out using this device in the form of a hollow piston mounted on rods at a distance of 20-50 m from the wellhead above the pump plunger. The upper and lower gas transfer valves are installed lower and higher than the extreme positions of the hollow piston and the distance between them is set depending on the stroke of the pump plunger from 2.5 m to 3.5 m. The number of gas transfer valves can vary from 2 to 4 pieces or more, depending on the gas factor of the well . The gas transfer valve has a hollow body with a radial hole for fluid passage, a valve in the form of a ball placed in the seat screwed into the valve body, is parallel to the tubing string and is additionally equipped with a filter in the form of a cylinder D = 20 mm with concentric openings d = 3.0-4.0 mm. The filter is connected to the housing and located below the valve cage. This allows geophysical instruments with a diameter of more than 28 mm and other devices, such as a flexible pipe, to move freely in the annulus. In addition, depending on technological tasks, the gas transfer device is located in various places on the tubing string. For flushing the tubing from the paraffin deposit, the gas transfer device is located at a distance of 20-50 meters above the pump plunger, and for bleeding associated gas into the tubing string, the gas transfer device is located at a distance of 20-50 meters below the wellhead. To increase the service life of the gas transfer device, the sealing cuffs 8 are made of fluoroplastic. The gas transfer valve can be installed on the tubing and the used pump cylinder.

In FIG. 1 shows a longitudinal section through a universal gas transfer device.

In the well 1 with a pump plunger 4, a pump cylinder 5, tubing 6, a hollow piston 7 with sealing collars 8 is mounted using a polished rod 2 and a rod string 3. Lower and higher gas transfer valves 9 and upper gas transfer valves are mounted below and above the extreme positions of the hollow piston. 10. The lower gas bypass valve 9 and the upper gas bypass valve 10 consist of a hollow body 11, with a radial (bypass) hole 12, a ball 13, a seat 14 and a filter 15. The bypass hole 16 in the tubing 6 is made with a diameter of 6-8 mm. Well 1 is tied into a manifold line using wellhead piping 17 and a non-return valve 18. A gas transfer valve opens when a pressure difference occurs between the tubing and the annular space of 3-4 atm.

The proposed device operates as follows. When moving the pump plunger 4, the hollow piston 7 moves. In the region of the lower gas bypass valves 9 and the upper gas bypass valves 10, a jet break is created, reinforced by the sealing of the hollow piston 7 in the tubing 6 due to the sealing collars 8. This facilitates the movement of accumulated annular gas through the filter 15 into the body 11 of the gas bypass valve, raising the ball 13 from the seat 14, allowing access to the bypass hole 12 of the gas bypass valve and the radial hole 16 in the tubing 6. Thus, the pressure is relieved the annular (annular) space of the well in the lower spring-loaded gas bypass valve 9 (located on the tubing 6) during the course of the plunger of the pump 4 upward with the hollow piston 7. When the associated gas pressure in the annulus (annulus) of the well decreases (pressure equalization in the tubing and annulus) , the ball 13 sits in the seat 14 and closes the hole 12. During the plunger of the pump 4 with the hollow piston 7 down, in the upper gas bypass valve 10 (located on the tubing 6) the accumulated annular gas moves through the filter 15 into the housing 11 g a bypass valve, raising the ball 13 from the seat 14, allowing access to the bypass hole 12 of the gas bypass valve and the radial hole 16 in the tubing 6. When the associated gas pressure in the annulus (annulus) of the borehole decreases (pressure equalization in the tubing and annulus), the ball 13 sits in the seat 14 and closes the hole 12. According to the tubing 6, the accumulated annular gas through the hollow piston 7 enters the manifold line of the well through the wellhead piping 17 with the check valve 18.

The universal gas transfer device operates in forced mode. This allows you to provide a constant fluid level and constant pressure in the annulus.

In wells, where it is predicted that sediment deposits are predicted, when the pumping equipment is lowered into the well, a universal gas transfer device is placed at a distance of 20-50 meters above the pump.

The device operates as follows. The wellhead 17 of the well 1 is strapped using the CA-320 pumping unit and a water carrier and the well is put into operation with the help of SC (not shown in Fig. 1). In this case, the process of backwashing the well is carried out. The used process fluid (possibly heated) contains up to 0.5% of the ML-81B detergent. Due to the movement of the hollow piston 7 to the upper and lower positions, the lower gas bypass valve 9 and the upper gas bypass valve 10 are opened alternately in the annular space of the well 1 at the place of installation of the spring-loaded gas bypass valves 9 and 10, a rupture of the stream is created, reinforced by the sealing of the hollow piston 7 in the tubing 6 for due to sealing cuffs 8. The flushing fluid through the filter 15 enters the housing 11 of the lower and upper gas bypass valve, lifting the ball 13 from the seat 14 and then into the bypass hole 12 of the gas bypass th valve and radial hole 16 of the inner space of the tubing 6.

At the end of the backwash of the well with a decrease in pressure in the annular (annular) space of the well (equalizing the pressure in the tubing and annular space), the SC is stopped (not shown in Fig. 1), the CA-320 pump unit and the water carrier are beaten from the well and start wells to work.

What is new is that during the flushing of the well, the process fluid (possibly heated) enters not only the pump valves, but also the upper tubing interval, which creates the greatest effect on preventing the formation of paraffin deposits in the tubing and production string.

Also new is the fact that this universal gas transfer device is multiple in use, and in the process of inspection and repair involves the replacement of a worn ball with a seat and a spring. The simplicity of the design allows for the revision of the universal gas transfer device during the next underground repair in the underground well repair team without having to take it to a mechanical workshop. The use of a universal gas transfer device allows you to maintain an optimal dynamic level in the well, ensuring normal operation of the pump. The universal gas transfer device is safe to operate for service personnel and is aimed at preserving the ecology of the environment (preventing the discharge of annular gas into the atmosphere).

A universal gas transfer device, depending on the placement of tubing on the string, can be used both for bleeding annular gas and for preventive treatment (flushing) of the well. During preventive treatment of wells, the greatest effect is achieved in wells equipped with a universal gas transfer device for pumps of the RHAM-125, TNM-125, RHAM-150, TNM-150 type with a small flow area, as well as in wells predisposed to the formation of paraffin deposits. The gas transfer valve can be installed on the tubing and the used pump cylinder.

Claims (2)

1. A universal gas transfer device for the operation of SHGN, containing tubing with a radial hole, a hollow piston with sealing cuffs, lower and upper gas transfer valves, consisting of a hollow body with an opening for the passage of liquid and gas, a shutter in the form of a ball placed in the saddle, characterized in that the hollow piston is placed on the rods above the pump plunger parallel to the tubing string, and the sealing cuffs are made of fluoroplastic. 2. The universal gas transfer device according to claim 1, characterized in that it is located 20-50 meters below the wellhead.

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