RU2513608C1 - Controlled bypass valve - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to valve used in simultaneous-separate operation of multi-bed wells. Proposed valve comprises top, mid and bottom bodies. Top body is coupled with coupling via branch pipe. Said top, mid and bottom bodies are locked by lock rings. Piston one part is arranged inside top body. Top body inner part is divided by said piston into cavities. Piston is pressed by spring. Said cavities are communicated with unions via channels. Piston other side is located in sleeve with radial through bores. Mid body has through lengthwise channels. Total area of cross-sections of said through lengthwise channels in mid body is smaller than that of the piston central channel. Besides, mid body has the main channel.

EFFECT: better tightness and reliability, flawless operation at the well with formation fluid containing mechanical impurities.

5 cl, 5 dwg

Description

The invention relates to the oil and gas industry, namely, valves used, for example, during simultaneous and separate operation of a multilayer well.

There is a method of simultaneous and separate operation of a multilayer well and equipment for its implementation, including descent on tubing — a tubing of a liner with a plug, a packer, lower bypass valves — KP located below and above the openings of the lower perforation interval in the production string, and upper valves bypass - KP installed below and above the holes of the upper perforation interval, bringing packers into working condition and well operation. According to the invention, a lower bypass valve is controlled above the packer, separating the lower and upper layers, and the control valve is remote control with a plug. At the first stage, at the first stage, a flow distributor is attached without its disconnecting element. Above the upper gearboxes, the upper gearbox is installed, controlled remotely. Between the lower and upper KPUs in the tubing of larger diameter, pipes of smaller diameter are inserted, the lower end of which is screwed into the movable hollow rod in the second stage, as a disconnecting element, which is passed inside the flow distributor. The upper end of these pipes is connected to the upper CPU. At the same time, the lower KPU is installed with the possibility of cutting off the fluid flow from the lower perforation interval, passed through the movable hollow rod and pipes of smaller diameter, the upper KPU is installed with the possibility of cutting off the fluid flow from the upper perforation interval, passing through the annular space between the tubing of larger diameter and pipes of smaller diameter (RU patent No. 2451164, publ. 05/20/2012).

A disadvantage of the known invention is the possibility of loss of tightness and leakage in the bypass valve controlled due to the insufficient number of o-rings, as well as the complexity of manufacturing, assembling and disassembling the valve.

The patent holder of the prototype and the applicant of the alleged invention is LLC NPF Packer.

The technical result of the claimed invention is to achieve better tightness of the bypass controlled valve, ensuring efficient, reliable and trouble-free operation of the bypass controlled valve during simultaneous and separate operation of the well, the reservoir fluid of which contains mechanical impurities, as well as ensuring the manufacturability of manufacturing the controlled bypass valve.

The technical result is achieved in that:

- the controlled bypass valve consists of interconnected upper, middle and lower bodies, while one part of the piston, preloaded by a spring, is located inside the upper body, and the other part of the piston is located in a sleeve having through radial holes, the inner part of the upper case is divided by the piston into cavities connected to the fittings by means of channels, through the middle channels are made through longitudinal channels, the total area of which is less than the cross-sectional area of the Central channel of the piston, and in the upper There are grooves for O-rings and the middle housings, piston, bushing;

- between the upper case and the piston, between the upper and middle cases, the piston and the sleeve, the sleeve and the upper case, the sleeve and the middle case, the middle and lower cases have sealing rings;

- connections of the upper, middle and lower cases are fixed by circlips;

- the upper case is connected through a pipe to the coupling;

- a plug or pipe string is attached to the middle body.

The execution of the valve bypass controlled compound,

consisting of interconnected upper, middle and lower bodies facilitates valve manufacturing technology.

The implementation in the middle body of the through longitudinal channels, the total area of which is less than the cross-sectional area of the central channel of the piston, allows you to accelerate the flow movement, which prevents clogging of the through holes of the middle case with mechanical impurities, and thus, reliable and efficient operation of the bypass valve controlled when producing reservoir fluid with mechanical impurities.

The presence of o-rings between the upper body and the piston, between the upper and middle bodies, the piston and the sleeve, the sleeve and the upper body, the sleeve and the middle body, the middle and lower bodies increases the tightness and reliability of the controlled bypass valve.

Fixing the connections of the upper, middle and lower bodies with retaining rings protects the design of the bypass valve controlled from the lapel, and also increases reliability and ensures trouble-free operation of the bypass valve controlled in the well.

The possibility of attaching a plug to the middle body allows for complete blocking of the movement of the formation fluid along the pipe string when closing the bypass valve controlled during simultaneous and separate operation of the well. The possibility of connecting the pipe string to the middle body allows the formation fluid to move along the through longitudinal channels of the middle body and along the main channel when opening the bypass valve controlled during simultaneous and separate operation of the well. Also, the possibility of attaching to the middle body either a plug or pipe string allows you to install a bypass valve controlled, respectively, either to block the flow of reservoir fluid from the lower reservoir, or to pass the reservoir fluid fluid from the lower reservoir and upstream reservoirs.

Figure 1 shows a diagram of the bypass controlled valve. Figure 2 presents a section bb. Figure 3 presents the layout of the cavity A. Figure 4 shows the layout of the cavity B. Figure 5 shows a top view with the location of the fittings connecting the control lines.

Controlled bypass valve (Fig. 1) includes upper 1, middle 2, lower 3 bodies. The upper housing 1 is connected through a pipe 4 to the coupling 5. The coupling 5 and the lower housing 3 are used to connect the bypass valve controlled with the main pipe string (not shown). The connections of the upper 1, middle 2, lower 3 buildings are fixed from the lapel by the retaining rings 6, 7 (Figs. 1 and 2). One part of the piston 8 is located inside the upper housing 1. The inner part of the upper housing 1 is divided by the piston 8 into the cavity A (figure 3) and B (figure 4). The piston 8 is preloaded by the spring 9. The cavities A and B are connected to the fittings 10, 11 (Figs. 3-5) through channels 12, 13 (Figs. 3 and 4). The piston 8 (Fig. 1) on the other side is located in the sleeve 14 having radial through holes 15. In the middle case 2 there are through longitudinal channels 16. The total cross-sectional area of the through longitudinal channels 16 made in the middle case 2 is less than the cross-sectional area sections of the Central channel 17 of the piston 8. In addition, in the middle casing 2 of the bypass valve controlled there is a main channel 18. Between the upper body 1 and the piston 8 there are o-rings 19, 20, between the upper 1 and the middle 2 of the casing ring 21, between the piston 8 and the sleeve 14, the sealing rings 22, 23, between the sleeve 14 and the upper housing 1, the sealing ring 24, between the sleeve 14 and the middle 2 housing the sealing ring 25, the middle 2 and lower 3 bodies the sealing ring 26. The sealing rings 19 , 20, 21, 22, 23, 24, 25, 26 tightness of the joints is ensured. In the upper 1 and middle 2 cases, the piston 8, the sleeve 14 there are grooves for the sealing rings 19, 20, 21, 22, 23, 24, 25, 26. Depending on the borehole assembly, a plug or a pipe string of smaller diameter is connected to the middle case 2 (not shown). The plug is installed if it is necessary to completely shut off the fluid flow through the pipe string when closing the controlled bypass valve. A pipe string of smaller diameter is installed if it is necessary to ensure the movement of the formation fluid both through the through longitudinal channels 16 of the middle casing 2 and along the main channel 18 when opening the bypass valve controlled during simultaneous and separate operation of the well.

The control bypass valve operates as follows.

Install a bypass valve controlled into the pipe string according to the well layout. Attach impulse tubes (not shown) to the fittings 10, 11. Release the bypass valve controlled with impulse tubes as part of the layout of the underground equipment into a routed production string (not shown) to a given depth. Installation of impulse tubes is carried out in two ways. In the first method, both impulse tubes are led out to the wellhead. The control pressure is calculated according to the formula

$$R_{\mathrm{at}}=\Delta R_{\mathrm{at}}+\Delta R_{tR}<\left(R_{d\mathrm{about}P.\mathrm{and}mt.tR}-h\rho g\right)(\mathrm{one})$$

where P _y is the control pressure;

ΔР _U - differential pressure for valve control;

ΔР _Tr - differential pressure to compensate for pressure losses in

capillary tube;

P _add - allowable pressure for impulse tubes;

h - valve installation depth;

ρ is the fluid density;

g is the acceleration of gravity.

According to the second method, the impulse tube to close the valve is led out to the wellhead, the impulse tube to open into the pipe string is led above the pump, and the fluid pressure should not exceed the allowable pressure for the impulse tubes. The control pressure is calculated according to the formula

$$R_{\mathrm{at}}=R_{n\mathrm{to}t}-h\rho g+\Delta R_{\mathrm{at}}+\Delta R_{tR}<\left(R_{d\mathrm{about}P.}-h\rho g\right),(2)$$

where P _y is the control pressure;

h - valve installation depth;

ρ is the fluid density;

g is the acceleration of gravity;

ΔР _У - pressure drop for valve control, ΔР _у = 1.5 MPa;

ΔР _Tr - differential pressure to compensate for pressure losses in the capillary tube;

P _add - allowable pressure for impulse tubes;

R _tubing - pressure in the pipe string.

Moreover, P _nct > hρg. To control the valve, it is necessary to create a pressure drop in the valve control lines of at least 1.5 MPa, at the same time a pressure drop occurs, which indicates the movement of the piston 8, and a subsequent increase in pressure after the end of the movement of the piston 8. The pressure in the control line must not exceed the permissible impulse tubes. The control pressure is determined by the formulas (1) or (2) depending on the method of installation of the impulse tubes. When pressure is applied to the control line to close the valve through impulse tubes (not shown) connected to the nozzle 10, the spring 9 is compressed and the piston 8 is moved down due to the pressure of the working agent entering the cavity A through the channel 12. The piston 8 that moves downward shuts off through radial holes 15 in the sleeve 14. In this case, the borehole medium is supplied through the main channel, and the borehole medium from the annulus is stopped.

If both impulse tubes are led out to the mouth, the valve is opened after depressurizing the valve closing line and applying pressure to the valve opening control line through impulse tubes (not shown) connected to the nozzle 11. In this case, the spring 9 is opened, the piston 8 moves up due to the pressure of the fluid entering the cavity B through the channel 13. The through radial holes 15 of the sleeve 14 open, the supply of the borehole medium from the annulus begins, and the supply of the borehole medium through the main channel 18 must.

The claimed invention allows to provide better tightness of the bypass controlled valve, as well as the efficiency, reliability and trouble-free operation of the bypass controlled valve during simultaneous and separate operation of the well, the reservoir fluid of which contains mechanical impurities, as well as to ensure the manufacturability of manufacturing the controlled bypass valve.

Claims (5)

1. The bypass valve is controlled, comprising a housing with a radial hydraulic channel, a spring, a sleeve with holes, o-rings, characterized in that it consists of interconnected upper, middle and lower bodies, while one part of the piston, preloaded by a spring, is located inside the upper case, and the other part of the piston is located in a sleeve having through radial holes, the inner part of the upper case is divided by the piston into cavities connected to the fittings by means of channels, in the middle case there are no through longitudinal channels, the total area of which is less than the cross-sectional area of the central channel of the piston, and in the upper and middle bodies, the piston, the sleeve there are grooves for the sealing rings. 2. The valve according to claim 1, characterized in that between the upper body and the piston, between the upper and middle bodies, the piston and the sleeve, the sleeve and the upper body, the sleeve and the middle body, the middle and lower bodies have sealing rings. 3. The valve according to claim 1, characterized in that the connections of the upper, middle and lower bodies are fixed with retaining rings. 4. The valve according to claim 1, characterized in that the upper body is connected through a pipe with a sleeve. 5. The valve according to claim 1, characterized in that a plug or pipe string is attached to the middle body.

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