RU2548279C2 - Downhole device for annular gas bypassing - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil and gas producing industry and can be used for annular gas bypassing to the flow string in wells operated by sucker-rod pump units. Task of the invention is to perfect design of the downhole device for annular gas bypassing in order to improve operational efficiency of the well sucker-rod pumping equipment notwithstanding temperature conditions of the well operation and pressure of annular gas. The device is placed in the well annular space over the well fluid level in the flow string collar. The device comprises a return valve and a radial hydraulic channel. In the collar lower part there is a radial hydraulic channel interconnected to the well annular space at the one side through the return valve and to the flow string cavity at the other side through a jet device. At that axes of the radial hydraulic channel and the jet device are crossed in the nozzle area of the latter. Besides the device comprises a flow string with a whipstock for gas-fluid flow in it. The whipstock is made as a bushing capable to be fixed in the flow string collar. Length of the whipstock for gas-fluid flow is less than distance between receipt and discharge of the jet device. Axes of the radial hydraulic channel and the jet device are perpendicular. Fixation of the whipstock for gas-liquid flow in the flow string collar may be implemented by equipping the flow string collar with an inner groove and the whipstock for gas-liquid flow with a ring holder.

EFFECT: usage of device allows reducing pressure of annular gas notwithstanding temperature and pressure conditions thus increasing life between overhauls for the sucker-rod pumping equipment; besides, this device allows reducing pump-setting depth for the sucker-rod pump due to increase of fluid level over the pump thus reducing consumption of the flow string and pump rods and increasing life between overhauls for the units.

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Description

The invention relates to the oil and gas industry and can be used to transfer annular gas into the tubing string in wells operated by rod pump installations.

A known method of discharging gas from the annulus [RF Patent No. 2079636, E21B 43/00, publ. 05/20/1997.], Which provides for the location of the check valve in the annulus, but the method has limitations in use, because its use is possible only in wells operated by electric centrifugal pump units.

Closest to the proposed invention is an automatic valve device, consisting of a check valve and a device for controlling its operation, made in the form of a piston and a housing. The piston is connected to the discharge line by means of two corrugated tubes and a pusher concentrically mounted under it. In the walls of the housing there are wedge-shaped pushers with springs. The non-return valve is connected to the flow line through a hydraulic channel [Aut. testimonial. USSR No. 625021, E21B 33/03, publ. 09/25/1978].

The design of the prototype device does not function at low temperatures, due to freezing of the check valve located on the flow line, as well as freezing of the corrugated tubes, which leads to their rupture and violation of the tightness of the device for controlling the operation of the check valve. The design of an automatic valve device is generally complex and cumbersome.

The objective of the invention is to improve the design of the borehole device for by-pass gas bypass in order to increase the efficiency of the sucker rod pumping equipment, regardless of the temperature conditions of the well and the value of the annulus pressure.

The problem is solved by the proposed downhole device for by-pass annulus gas.

The borehole device for annulus gas bypass contains a check valve and a radial hydraulic channel, the device is located in the annulus of the well above the level of the borehole fluid in the coupling of the tubing string string, at the bottom of the coupling there is a radial hydraulic channel connected to the annulus of the borehole through check valve, and on the other hand, with the tubing cavity through the jet apparatus, the axes of the radial hydraulic channel and the jet apparatus intersect at domain of the last nozzle; in addition, the device contains a string of pump rods with a gas-liquid flow diverter placed on it, made in the form of a sleeve and with the possibility of fixing in the tubing string coupling, the length of the gas-liquid flow diverter is less than the distance between the intake and discharge of the jet apparatus. The axes of the radial hydraulic channel and the jet apparatus are perpendicular.

The possibility of fixing the gas-liquid flow diverter in the tubing string coupling can be realized, for example, by equipping the tubing coupling with an internal groove, and the gas-liquid flow diverter with an annular holder.

An arrangement of a downhole device for annular gas bypass is shown in FIG.

The design of the downhole gas bypass device is shown in FIG. 2 (sections A-A and BB) and 3 (sections BB and BB).

The non-return valve 1 (Fig. 3) and the associated radial hydraulic channel 2 (Fig. 3, B-B) located in the lower part of the sleeve 3 (Fig. 2) of the tubing string 4 connect the annular space formed by the inner wall of the production string 5 (FIG. 1) and the outer wall of the tubing string 4 (FIG. 2), with the tubing string cavity 4 by means of an inkjet apparatus 6. The axis of the radial hydraulic channel 2 (FIG. 3, BB) and the inkjet apparatus 6 (FIG. 2 ) are perpendicular and intersect in the area of the nozzle 7 of the jet apparatus 6.

Fixed deflector ring 8 in the internal groove 9 of the sleeve 3, the gas-liquid flow deflector 10 (Fig.3), made in the form of a sleeve and previously temporarily fixed (for example, glue on a sliding fit) on the column of the sucker rods 11, allows you to freely make the return translational movement of the string of pump rods 11 and is designed to seal the inner space of the tubing string 4 (figure 2) and changing the direction of gas-liquid flow from the tubing string 4 to the nozzle 7 of the jet apparatus 6. The length of the deflector g zo-liquid stream 10 (Figure 3) is smaller than the distance between the intake 12 (Figure 2) and the jet device 13 vykidom 6.

Downhole device for by-pass gas bypass is located in the coupling 3 of the tubing string 4, designed for transporting formation fluid pumped out by a rod pump 14 (Fig. 1).

Downhole device for bypass annular gas operates as follows.

During the descent of the sucker rod pump 14 (Fig. 1), the gas-liquid flow diverter 10 (Fig. 3) is fixed with glue to the column of sucker rods 11. During the operation of the sucker rod pump 14 (Fig. 1) when the column of sucker rods 11 moves (Fig. 3) upward the annular holder 8 (figure 2) of the gas-liquid flow deflector 10 (figure 3) is fixed in the internal groove 9 (figure 2) of the coupling 3, as a result of which the adhesive joint is destroyed. Due to the change in the flow direction of the gas-liquid mixture (GHS) by the flow diverter 10 (Fig. 3), the ICS enters the nozzle 7 (Fig. 2) of the jet apparatus 6, i.e. in the area of reduced pressure, where through the radial hydraulic channel 2 (Fig.3, BB) through the check valve 1 also receives gas annulus, in which the pressure is increased. Mixed, annular gas and GHS through the discharge 13 (Fig. 2) of the jet apparatus 6 fall into the cavity of the tubing string 4 above the flow diverter 10 (Fig. 3). GHS through the tubing string 4 (figure 2) enters the wellhead and then into the flow line, and the gas in the composition of this mixture does the work of lifting it, which reduces the load on the rocker head of the rocking machine, thereby increasing the overhaul period of the installation. In this case, there is a decrease in gas pressure in the annulus.

During the course of the column of sucker rods 11 (Fig.3) down in the proposed device, absolutely the same processes occur as during the up. Because, during the course of the string of pump rods 11 down, the pumped-out GHS also enters the string of tubing 4 (Fig. 2) at the wellhead due to the displacement of liquid by the immersed part of the string of pump rods 11 (Fig. 3), as in the course of the rods up when the GHS is displaced by the rod pump 14 (Fig. 1).

The use of a borehole device for annular gas bypass allows reducing the annular gas pressure irrespective of temperature conditions and the annular gas pressure, allowing to increase the overhaul period of the rod-pumping equipment by increasing the liquid level above the rod pump and due to the absence of hydrate plugs in the annulus.

The use of a borehole device for annulus gas bypass will reduce the depth of the rod pump suspension by increasing the liquid level above the rod pump and thereby reduce the consumption of tubing, pump rods and increase the overhaul period of the plants.

The technical and economic efficiency of a borehole device for annular gas bypass consists in increasing the efficiency of operation of wells operated by rod pump installations, and in increasing the flow rate of wells.

Claims (1)

A downhole annular gas bypass device located in a tubing string — tubing with a sleeve and comprising a check valve and a radial hydraulic channel, characterized in that the radial hydraulic channel is located in the lower part of the sleeve and connected to the annular space of the well through the return the valve, and on the other hand, with the tubing cavity through the jet apparatus, the axes of the radial hydraulic channel and the jet apparatus intersect in the nozzle region of the latter, in addition, devices o contains a gas-liquid flow diverter, made in the form of a sleeve, with the possibility of fixing in the tubing string coupling, and the length of the flow diverter is less than the distance between the intake and discharge of the jet apparatus, while the tubing coupling has an internal groove and the gas-liquid flow diverter is an annular holder, the axes of the radial hydraulic channel and the jet apparatus are perpendicular.

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