RU2081300C1 - Valve device for regulation of well operation - Google Patents

Abstract

FIELD: oil and gas industry. SUBSTANCE: valve device has hollow body with upper passages such as longitudinal slots and lower passages. Also provided are isolating members in the form of bellows or pistons with one of them being installed in upper part of body and creating hermetic chamber with it, and other being installed in lower part of body to create hermetic chamber. Both isolating members are rigidly connected with locking member located between rods. Diameters of isolating members are equal to or larger than diameter of locking member. With locking member in extreme upper position, area of bore opening of upper passages is less than through cross-sectional area of lower passages in body. Sealing units are installed between upper and lower passages. Throttling clearance is provided between locking member and body for equalization of pressure of medium. Lower hermetic chamber can be filled with medium which is sensible to temperature that is with medium which substantially changes its volume with temperature change. Chambers can be hydraulically interconnected through passages in rod and locking member. Device functions reliably and efficiently irrespective of changing temperature, pressure differential or flow rate of well medium. EFFECT: high efficiency. 4 cl, 3 dwg

Description

 The invention relates to the oil and gas industry, in particular, to the technology of oil and gas production and can be used to automatically control flow parameters depending on temperature, pressure drop or temperature changes in the flow of the medium (gas, liquid or gas-liquid mixture).

 Known valve device (Catalog. Equipment for gas-lift operation of oil wells. ZINTIKHIMNEFTEMASH. M, 1991), comprising a hollow body with channels, a disconnecting element in the form of a bellows, forming a chamber filled with gas, a seat and a shutter with the body.

 It is also known valve device (AS No. 1696676, class E 21 B 34/06, published. 07.12. 91), including a hollow body with throughput lower and upper channels, uncoupling elements that form a sealed chamber, stem, shutter and a seal, wherein the uncoupling elements are made in the form of bellows rigidly connected to the shutter and form chambers filled with medium with the housing, and the shutter in the lower position excludes hydraulic communication between the upper and lower passage channels.

 These devices open and close from the pressure of the medium (gas and liquid), while there is no temperature effect on their work, that is, they cannot adjust the technological parameters of the well depending on temperature (for example, reservoir fluids) and temperature change, as well as on the differential pressure flow medium.

 The purpose of the invention is to increase the efficiency and reliability of the device by ensuring its functioning from temperature or pressure drop, or from changes in the temperature of the medium flow. The positive effect of the use of the device in the field of oil and gas production is expressed in an increase in the flow rate of wells by maintaining the process parameter (temperature, pressure drop, or change in the temperature of the medium flow) at an optimal level.

The specified goal is achieved due to the following technical solutions:
the shutter is installed in the housing between the disconnecting elements, and between the shutter and the housing there is a throttling gap (channel), while the open section area of the upper channels under the upper extreme position of the shutter is less than the sectional area of the lower channels of the housing, and the diameters of the disconnecting elements are equal to or larger than the diameter of the shutter.

The device balances the pressure above and below the shutter in the well (due to a small throttling gap), which ensures installation and removal of the device using cable technology. In the operation of the device, throttling of the flow is created in the upper channels of the housing (for example, made in the form of longitudinal slots) due to the optimal choice of their maximum throughput area. These solutions generally ensure the operation of the device from temperature, pressure drop (if the shutter diameter is larger than the diameter of the disconnecting elements) or changes in the temperature of the medium flow, which expands the scope of its application;
the lower sealed chamber (the chamber under the lower uncoupling element) is filled with a medium that is sensitive to temperature changes (i.e., a special medium that changes its volume relatively much with small temperature changes), which ensures the operation of the device only from the temperature of the medium flow (for example, from the bottomhole well temperature);
both sealed chambers are filled with a medium that is sensitive to temperature changes, which allows you to adjust the temperature change of the medium during throttling of the flow in the upper channels of the housing;
hermetic chambers formed between the disconnecting elements and the body are hydraulically interconnected through a channel located in the shutter and rods, which increases the accuracy of regulating the pressure drop of the borehole fluid flow (pressure difference before and after the device).

 In FIG. 1 shows a General view of the device (in the closed state) with uncoupling bellows; in FIG. 2 device in open state; in FIG. 3 device with uncoupling pistons.

 The device includes a hollow body 1 with upper 2 (for example, in the form of longitudinal slots) and lower 3 channels, disconnecting elements in the form of bellows (Fig. 1, 2) or pistons (Fig. 3) 4 and 5, one of which 4 is installed in the upper part of the housing 1 and forms a chamber 6 with it, and the other 5 is installed in the lower part of the housing 1, forming a chamber 7. Both uncoupling elements 4 and 5 are rigidly connected to the shutter 8 installed between the rods 9 and 10. The diameters of the uncoupling elements 4 and 5 equal to or greater than the diameter of the shutter 8. With the highest position of the shutter 8, the open cross-sectional area I channels 2 under the shutter 8 is less than the area of the passage section of the channels 3 of the housing 1. Between the upper 2 and lower 3 channels are seals 12. To balance the pressure between the shutter 8 and the housing 1 there is a small throttling gap 11.

 The chamber 7 may be filled with a temperature sensitive medium, that is, a medium that changes its volume relatively relatively with a small change in temperature.

 Chambers 6 and 7 can be hydraulically connected to each other through channels 13 and 14 of the rods 9, 10 and channel 15 of the shutter 8.

 When controlling the device from temperature changes, the chamber 6 is also filled with a medium that is sensitive to the temperature of the formation fluids.

 In one case, the device only works from the pressure drop of the medium flow acting on the shutter 8, and in the other case, on the temperature in the well (if the diameters of the shutter and disconnecting elements are equal, since the fluid pressure acting on the area of the disconnecting elements 4, 5 and the shutter 8 completely cancel each other out).

 With increasing pressure or temperature of the borehole medium under the shutter 8, the lower uncoupling element 5 with the shutter 8 moves upward (since the pressure or temperature above the shutter 8 is less due to throttling of the fluid in the gap 11) and opens the channels 2, which ensures the movement of the borehole medium through channels 3 and 2. Moreover, the degree of opening of channels 2 depends on the degree of change in pressure or temperature during throttling. With a change in temperature in the bottom of the well, the medium in the chamber 7 changes its volume and, thereby, moves the shutter 8 up or down. And with increasing pressure in the well, the shutter 8 moves up, for example, by stretching the bellows 5 and compressing the bellows 4.

 Thus, the device controls the temperature, pressure drop or change in temperature of the fluid flow, and therefore the technological parameters of the well associated with pressure or temperature.

Claims (5)

 1. Valve device for regulating the mode of operation of the well, including a hollow body with throughput lower and upper channels, uncoupling elements, rigidly connected to the shutter and forming sealed chambers filled with medium, a rod and a seal, characterized in that the shutter is installed in the housing between uncoupling elements with a throttling gap between the shutter and the housing, while the open cross-sectional area of the upper channels under the closure at its highest position is less than the cross-sectional area of the lower channels a, and the diameters of the disconnected elements are equal to or greater than the diameter of the shutter.  2. The device according to claim 1, characterized in that the lower sealed chamber is filled with a medium sensitive to temperature changes.  3. The device according to claim 2, characterized in that both sealed chambers are filled with a medium sensitive to temperature changes.  4. The device according to claim 1, characterized in that the sealed chambers formed between the disconnecting elements and the housing are hydraulically interconnected through a channel located in the shutter and rods.  5. The device according to claim 1, characterized in that both disjoint elements or one of them is made in the form of a piston.

Images