RU1787194C - Circulation valve - Google Patents

Abstract

The invention relates to the oil and gas industry, and in particular to underground well equipment for developing, killing and flushing oil and gas wells. The purpose of the invention is to expand functionality while increasing reliability. . The valve contains a housing with bypass and circulation channels. The bypass channel is made in communication with the corresponding circulation channel and is equipped with a ball valve. In the lower part of the bypass channel there is a ball valve seat, and in the upper part there is a stop-limiter of the ball valve. A carbide nozzle with a clamp is installed in the circulation channel. A valve is lowered into the well together with a device for creating instantaneous depressions. The air pumped by the compressor into the pipes exerts pressure on the fluid contained in them. The fluid enters the longitudinal channels and presses the ball valve against the stop. In this case, the fluid is expelled into the annulus. Valve prevents siphon fluid. The simplicity of the design, the absence of wearing parts and the presence of carbide tips make it more reliable. 1 ill. . ate with

Description

The invention relates to the oil and gas industry, in particular to underground well equipment for developing, killing and flushing oil and gas wells.

A circulation valve is known, consisting of a housing, a sleeve and a spring, the force of which is adjustable. The seal between the casing and the sleeve is carried out by rubber rings. The housing with the sleeve forms a high-pressure chamber communicating through openings in the housing with the in-tube space and an additional chamber communicating with the internal cavity of the housing through a check valve. The casing is made with washing holes.

This valve has low reliability and lack of functionality.

A circulation valve is also known, comprising a housing with bypass and circulation channels, a stepped sleeve and a spring, preloaded by adjusting nuts. The housing and sleeve form a high-pressure chamber, separated by a piston and a stop, and an additional chamber. Cameras communicate via ditches VJ

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and through a hole plugged with a plug, are filled with lubricant.

The disadvantage of this valve during well development using the method of instant high depressions is the unreliability of operation during repeated emptying of the internal cavity of tubing from the formation fluid, including abrasive materials. When the formation fluid flows from the tubing .. into the annulus through the circulating holes, part of the fluid will enter the high-pressure chamber between the piston and the spring-loaded stepped sleeve, and abrasive particles will settle and settle on the upper platform of the separation piston in this chamber. The accumulation and compaction of abrasive material inside the high-pressure chamber will cause the separation piston to seize inside the chamber and the spring will not be able to move the step sleeve to the lower position to close the circulation openings. In this case, the step sleeve will be locked with a hydraulic lock and keep the valve circulation openings constantly open. Thus, through this valve, a reverse flow of formation fluid from the annulus to the internal cavity of the tubing is possible.

Closest to the proposed one is a bypass valve for tubing, which allows fluid to circulate from the tubing to the annulus. Such a valve is a body with two channels. One channel connects the upper and lower cavities of the pipes, and the other connects the upper cavity and the annulus. In one channel, a valve is installed to allow fluid to pass from bottom to top, and in the other, a spring-loaded valve is used to prevent backflow of displaced formation fluid from the pipes.

However, when using this valve, in particular, during the development and research of drilling wells, during the process of displacing formation fluid from the pipes containing abrasive particles of the rock - for example, when the bottom-hole zone of the formation is partially destroyed or drilling fluid is removed from the formation, possible rapid wear of the holes communicating the channel with the annulus, valve seats. When the cavity of the tubing is re-emptied from the reservoir fluid through a worn hole, a ball of a spring-loaded valve will fall out, and in this case, fluid will flow through this channel from the annulus into the tubing cavity. Thus, as a result of the abrasive wear of the holes and the failure of the valve, a reverse flow of the formation fluid displaced from the pipes is possible.

In addition, the specified bypass valve for tubing does not have a central through channel of the required size to call the inflow from the reservoir by

instant deep depression, for example, when using downhole equipment. The absence of such a channel reduces the functionality of this valve during the development and call inflow

reservoir fluid from reservoirs of impaired permeability.

The purpose of the invention is the expansion of functionality while increasing reliability

devices by reducing the abrasive wear of the circulation valves and preventing the reverse flow of the formation fluid displaced from the pipes during well development by the method of instant high depression.

This goal is achieved in that the circulation valve, comprising a housing with bypass channels made with stops, and circulating

channels, equipped with spherical elements, landing slots for which are located in the lower part of the bypass channels, made hydraulically communicating in the middle part above the mounting nests

with corresponding circulation channels, and the stops are located in the upper part of the bypass channels above the nests of the ball elements.

The drawing shows a vertical

section of the circulation valve in the open position:

The circulation valve consists of a housing 1 with a through central bore having threads at the ends for

connection with tubing or drill pipe 11 using couplings 10. In the housing are made longitudinal (transfer) channels 2, having in the middle part of the seats 6 for ball 3. Upper

a portion of the longitudinal channels is threaded for mounting stops. The longitudinal channels in the middle part communicate with circulation channels 5, made in a horizontal plane in the housing,

which serve to communicate the internal cavity of the tubing or drill pipe 11 with an annular space bounded by the casing 9. At the end of the circulation channels there are carbide nozzles 7 secured with clips 8 ...

In order to create instantaneous deep depressions on the formation and subsequent development of the exploratory well or to clean the bottomhole zone of the formation and subsequent smooth excitation of the reservoir by the compressor, the circulation valve is lowered into the well in combination with the device for creating instantaneous depressions. Air pumped by the compressor into the tubing or drill pipe exerts pressure on the fluid in the interior of the pipe. Under the influence of excessive pressure of the fluid from the internal cavity of the tubing or drill pipe, it enters the longitudinal channels 2, lifts and presses the ball valve 3 against the restrictor 4, and the fluid is forced through the circulation channels-5 into the annulus between the valve and the casing.

After the liquid level in the inner cavity of the tubing or drill pipe decreases, the overpressure of the air pumped by the compressor into the atmosphere is vented through the wellhead. In this case, a pressure difference arises between the liquid columns in the inner cavity of the pipes and the annulus and, as a result, the ball valves 3 fit into the seats 6 and block the circulation channels 5 and the longitudinal channels 2, thereby preventing the overflow of the reservoir fluid - from the annulus to the inner cavity of the pipes.

Such operations can be carried out repeatedly, and due to the occurrence of pressure differences between the pipe and annular spaces, the circulation valve will periodically open or close. The rapid wear of the circulation channels 5 due to the action of abrasive rock particles contained in the formation fluid or process fluid is prevented by carbide tips 7 secured by clips 8 to prevent them from falling out of the valve body.

The proposed circulation valve prevents the siphon of liquid when lifting the pipes. In addition, the simplicity of the design, the absence of wearing parts and the presence of carbide tips make it possible to expand the functionality while increasing the reliability of the valve.

This makes it possible to increase the geological efficiency of exploration.

Claims (1)

The claims A circulation valve comprising a housing with bypass channels made with stops and circulation channels, characterized in that, in order to expand the functionality while improving reliability, it is equipped with ball elements, seating seats for which are located at the bottom of the bypass channels, made hydraulically communicating in the middle part above the landing sockets with the corresponding circulating channels, and the stops are located in the upper part of the bypass channels above the ball sockets marketing items.