RU2550708C1 - Method of wells operation with possibility of gas overpressure bypass, well liquid disconnection and gas shutdown bypass valve for its implementation - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: gas shutdown bypass valve comprises body, bush, float valve and casing secured by nuts. In body holes are made to connect the annulus with tubing internal cavity. In the casing holes are made for gas bypass. In bush through holes are made. In the body valve pairs are installed, they comprise seat and ball. In top part of the float valve the sealing bevels are made. The float valve seat has counter sealing bevels.

EFFECT: increased efficiency of automatic disconnection of the oil-gas-liquid well fluid entering from annulus in gas shutdown bypass valve.

2 cl, 1 dwg

Description

The invention relates to the oil and gas industry and can be used for fountain, gas lift well operation, well operation with pumping units, combined operation, in particular for bypassing the excess pressure of the gaseous medium and cutting off the oil and gas well fluid.

Known gas valve bypass production LLC "NKMZ", designed for communication and tight separation of the internal cavity of tubing from the annular space. The valve allows the excess gas to be transferred from the sub-packer zone of the casing to the tubing string when operating wells using an electric centrifugal pump (ESP) (page 33, catalog of NKMZ LLC).

Known one-way check valve with cable channel manufactured by Sibneftemash OJSC, designed to transfer fluid and gas from the annulus of the well to the tubing string during well operation using the ESP (http://www.sibneftemash.ru/products/dowrihole-equipmeniyvalve- KCO-KV).

A device is known for transferring gas from the annulus to the tubing string, including a coupling with a lateral hole connected at both ends to the tubing. The coupling is connected by a lateral surface to a lateral surface of the housing with a fit on a maximum plane to ensure the greatest heat transfer from the coupling to the housing. The housing is provided with a longitudinal channel connected to each other and a side hole aligned with the side hole of the coupling. A fitting and a check valve with a filter are located in the longitudinal channel of the housing. The non-return valve provides gas bleeding when the pressure in the annulus exceeds the pressure in the tubing string by 0.1-0.2 MPa (patent for the invention No. 2303124, publ. July 20, 2007).

Known gas bypass valve manufactured by LLC NPF "Packer", selected as a prototype, consisting of a rod on which the housing is mounted. The latter has openings in communication with the cavity of the stem, in which valves with a ball and a fitting are screwed, hermetically closing the passage openings from the inside. If necessary, instead of the valve pair, a protective plug is inserted into one of the holes with a calibration shear pin adjusted by shear force, which serves to create a constant communication between the pipe and annular spaces, to drain the fluid when the assembly is removed from the well. When the pressure inside the tubing exceeds the pressure in the annulus, the balls sit on the seat of the fitting and close the valve. Otherwise, they rise, communicating the annular space with the tubing cavity. The gas bypass valve is designed so that when it is opened, the ball rises into the "protective pocket" and is not involved in the flow. And in the holes communicating with the cavity of the rod, there are no barriers for passing the flow of the gas-liquid mixture and the possibility of the occurrence of ARPD and salts (article: “From theory to practice. The technology for reducing water cut in products has proven effective, but needs further testing.” J “ Exposition Oil Gas No. 2-2013 ").

A disadvantage of the known valves is the lack of the ability to automatically cut off the oil and water well fluid from the annulus into the valve, as well as the likelihood of damage to the valve seat splines when making and unscrewing with the body.

The technical result of the claimed invention is the ability to automatically cut off the oil and water well fluid coming from the annulus into the valve, as well as ensuring the reliability and simplicity of valve assembly-disassembly operations, eliminating the possibility of damage to the valve seat splines.

The claimed technical result is achieved by the fact that

- the bypass gas shut-off valve is equipped with a float-type valve with the possibility of cutting off the through holes of the sleeve by fitting the sealing faces of the float-type valve on the sealing lips of the seat, while the ball-seat valve pairs are installed inside the housing, the float-type valve is installed in the casing having openings for the bypass gas and nuts fixed from below;

- the bypass gas shut-off valve is equipped with a float-type valve with the possibility of cutting off the borehole fluid coming from the annulus into the valve when the level of the borehole fluid rises above the level of the float-type valve, as well as with the possibility of opening the float-type valve while lowering the borehole fluid level in the annulus.

Equipping the bypass gas shut-off valve with a float-type valve with the possibility of cutting off the through holes of the sleeve by fitting the sealing bevels of the float-type valve on the sealing lips of the seat allows automatic shut-off of the oil and water well fluid coming from the annulus into the valve when the fluid level rises above the level of the float valve type, and will also allow for the opening of a float type valve while lowering the oil level azovodyanoy borehole fluid.

The installation of the ball-seat valve pair inside the valve body of the bypass gas shutoff will ensure reliability and simplicity of valve assembly-disassembly operations without damaging the valve seat splines.

The installation of a float-type valve in a casing having openings for gas bypass and fastened with nuts on the bottom will ensure reliable assembly of the valve.

The valve bypass gas shutoff is shown in the drawing.

The bypass gas shutoff valve consists of a housing 1, a sleeve 2, a float type valve 3 and a casing 4, which are fixed with nuts 5. In the housing 1, holes 6 are made for communicating the annular space with the tubing internal cavity. In the casing 4, holes 7 are made for gas bypass. Through holes are made in sleeve 2. Valve pairs consisting of a seat 9 and a ball 10 are installed in the housing 1. There are sealing bevels 11 in the upper part of the float type valve 3. The float type 3 valve seat has mating faces 12.

The valve bypass gas shutoff operates as follows.

The bypass gas shutoff valve is installed in the tubing string (not shown) and the assembled assembly is lowered into the well (not shown) to a predetermined depth.

When the pressure inside the tubing exceeds the pressure in the annulus, the balls 10 sit on the saddles 9 and close the annulus.

When the gas pressure in the annulus exceeds the pressure in the tubing, the balls 10 depart from the seats 9 and communicate through the openings 6 of the casing 1 the annulus with the inner tubing cavity. The capacity of the valve bypass gas shutoff is regulated by the fitting holes of the seat 9.

When the liquid level rises above the level of the float type 3 valve, the float type 3 valve pops up. When it floats in the liquid, the sealing faces 11 of the float type 3 valves mate with the counter sealing faces 12 of the saddle. There is a cut-off of the through holes 8 of the sleeve 2 under the valve pairs of the ball 10 - seat 9.

The application of the claimed invention will allow the automatic shutoff of oil and water well fluid coming from the annulus into the valve bypass gas shutoff, as well as ensure the reliability and ease of assembly and disassembly of the valve without damaging the splines of the valve seat.

Claims (2)

1. The valve is a bypass gas shutoff comprising a housing, ball-seat valve pairs, choke seats, characterized in that it is equipped with a float-type valve with the ability to cut off the through holes of the sleeve by fitting the sealing bevels of the float-type valve on the mating seats of the saddle, while the valve ball-seat pairs are installed inside the body, a float-type valve is installed in the casing, which has openings for gas bypass and fixed with nuts on the bottom. 2. A method of operating wells with the possibility of bypassing excess pressure of the gaseous medium, cutting off the oil and gas-water well fluid, comprising installing a valve in the tubing string, lowering the assembled assembly into the well to a predetermined depth, seating the balls on the seats and closing the annulus when the pressure inside the column is exceeded tubing over pressure in the annulus, lifting balls from the seats and connecting annulus with the interior of the tubing pipes when the gas pressure in the annulus exceeds the pressure in the tubing, characterized in that the bypass gas shutoff valve is equipped with a float valve with the possibility of cutting off the borehole fluid coming from the annulus into the valve when the borehole fluid level rises above the valve level float type, as well as with the possibility of opening the float type valve while lowering the level of the borehole fluid in the annulus.