RU218590U1 - GAS INFLOW CONTROL DEVICE - Google Patents

Abstract

The utility model relates to the field of hydrocarbon production and can be applied to the operation of oil and gas wells, in particular, to equalize the inflow profile of the produced product along the length of a horizontal and sub-horizontal well, as well as to limit the inflow of an undesirable phase (oil, water) in each of the intervals of the well. The technical result is to increase the efficiency of natural gas production. The gas inflow control device is mounted between the tubing pipes at the places of coupling threaded connections, includes a body with holes located on the inside of the device and channels for fluid movement, flow restrictors acting as valves located inside the body channels, and a filter mesh.

Description

The utility model relates to the field of hydrocarbon production and can be applied to the operation of oil and gas wells, in particular, to equalize the inflow profile of the produced product along the length of a horizontal and sub-horizontal well, as well as to limit the inflow of an undesirable phase (oil, water) in each of the intervals of the well.

An autonomous downhole inflow regulator is known (RF patent No. 2513570, publ. 20.04.2014), the chamber is formed inside the housing and can be hydraulically communicated by a flow channel with an internal annular gap formed near the wellbore. The piston and the biasing element may be located inside the chamber, and the biasing element is adapted to bias the piston to the first position. The fluid flow path is formed inside the housing and communicates with the tubing string and the internal annulus. The flow path may have one or more nozzles disposed therein and the piston may be adapted to move between a first position allowing fluid flow through the flow path into the tubing string and a second position preventing fluid flow into the tubing string - blocked.

The disadvantage is that the valve is only able to close when the pressure difference between the inside of the tubing string and the well annulus increases, i.e. the valve closes the flow area of the fluid passage when the pressure difference increases.

A flow control device is known (RF patent for the invention No. 2600401, publ. 20.10.2016), which contains a housing consisting of an upper and lower parts interconnected by a threaded connection, an axial inlet to the housing and radially located outlets, an inlet to the secondary channel in the upper part of the housing, made in the form of a groove, in which a porous element is located, a system of capillary channels in the axial direction, made in the walls of the housing, a movable element, a collet and a small diameter nozzle. In the lower part of the housing, the capillary channels are combined into a cavity between the movable element and the lower part of the housing.

The disadvantage of the flow control device is the low reliability associated with the presence of capillary channels in the secondary flow, passing through which the medium flow repeatedly turns, which, in the presence of mechanical impurities, will lead to clogging of the secondary channel and a quick failure of the device.

Known is a system for controlling the flow of fluid in a well, containing a fluid module with a bridge network for fluid, and a method for using such a system (RF patent for invention No. The valve has a first position, in which fluid can flow through the main passage, and a second position, in which the flow of fluid through the main passage is blocked. The bridge network has the first and second branch ducts, each of which has an inlet and outlet connected with the main duct, and each of which includes two hydraulic resistances with a pressure sampling terminal located between them. During operation, the differential pressure between the terminals of the first and second branch ducts shifts the valve between the first and second positions.

The disadvantage is the presence of a network of branched narrow channels in the fluid module, located close to each other, which increases the likelihood of their clogging and system failure.

An adjustable flow restrictor is known for use in an underground well (RF patent for invention No. 2532410, publ. 11/10/2014), the system contains a flow chamber through which a multicomponent fluid flows, and this chamber contains at least one inlet, outlet and, at least one structure arranged in a spiral relative to the outlet, facilitating the twisting of the flow of the multi-component fluid in a spiral around the outlet. Another version of the system contains a flow chamber having an outlet, at least one structure that promotes the multicomponent fluid to spiral around the outlet, and at least one more structure that prevents the multicomponent fluid flow from being redirected to a radial trajectory passing to the outlet. The technical result consists in preventing the formation of a gas cone and/or water cone around the well.

The disadvantage of an adjustable flow restrictor is the low efficiency of well fluid separation when a medium with a lower viscosity enters.

Known autonomous inflow control valve AUCP-FLOWREG AICD (patent US WO 2013139601 A2, publ. 26.09.2013), which includes two hydraulic resistance, made in the form of one hole in the cover and several holes in the bottom of the housing, between which is installed with the possibility of axial movement disk. The disk performs the functions of a valve, the axial movement of which is limited on the one hand by the cover, and on the other hand by axial orientation protrusions located on the bottom inside the body. In the cover, the hole is made in the center, and in the bottom, the holes are located along the edge of the inner cavity of the housing.

The disadvantage is low reliability due to the fact that the protrusions of axial orientation, located close to the center, create conditions for clogging the internal cavity of the device, as well as for the disk to be skewed in it, since during the installation of the pipe into the well, its orientation during descent can change to 360°.

An autonomous inflow control device is known (US patent No. 8833466, publ. 09/16/2014), adopted as a prototype, containing a filter to remove solid particles from the formation fluid and two flow restrictors. The flow restrictors are located on opposite sides of the inflow control device and are connected by an insulated fluid passage. The inflow control device also includes one pressure reducing device that creates a pressure drop in formation fluid in response to fluid pressure in the reservoir. The inflow control device also includes a throttling device that allows shutting off the flow of produced fluid and cleaning the particulate filter, provided that the device is installed in the well.

The disadvantage of this device is the presence of many capillary channels in the area after the chambers with balls, passing through which the flow repeatedly turns, which in the presence of mechanical impurities will inevitably lead to clogging of the capillary channels and premature failure of the device.

The technical result is to increase the efficiency of natural gas production.

The technical result is achieved by the fact that inside the chamber there is a flow restrictor in the form of a ball, on which one end of the spring is fixed on one side, and the other end is fixed on the walls of the inlet channel, around the inlet to the blocking channel, which is made in the form of two cylinders with a narrowing between them wherein the blocking channel is connected to the outlet channel, the other end of which is connected through a hole, which is made on the surface of the inner cavity.

The gas inflow control device is illustrated by the following figures:

fig. 1 - general view of the device;

fig. 2 - enlarged image of the central part of the body;

fig. 3 - device in section;

fig. 4 - section of the device in volume,

where 1 - body;

2 - filter mesh;

3 – input channel;

4 - flow limiter;

5 - spring;

6 - blocking channel;

7 - output channel;

8 - outlet;

9 - internal cavity;

10 - internal thread;

11 - external thread;

12 - the central part of the body.

The gas inflow control device consists of a body 1 made in the form of a hollow cylinder with a thickening in the central part of the body 12. On one part of the body 1 behind its central part of the body 12, on the surface of the inner cavity 9, an internal thread 10 is made, and on the other part, an external thread thread 11 with the possibility of connection with tubing. A filter is fixed around the central part of the housing, which is used as a filter mesh 2. In the housing 1, inlet channels 3 are made parallel to each other, from the beginning of the filter mesh 2 to the center of the housing 1. Inside the inlet channel 3 there is a flow restrictor 4 in the form of a ball. The spring 5 is fixed on one side on the flow restrictor 4, and on the other side on the walls of the inlet channel 3, around the inlet to the blocking channel 6. The blocking channel 6 is made in the form of two cylinders with a narrowing between them. The blocking channel 6 is connected to the outlet channel 7, the end of the outlet channel 7 through the outlet hole 8 is connected to the internal cavity 9.

The gas inflow control device operates as follows. The device is installed between the tubing with the help of internal thread 10 and external thread 11 applied to the body 1. The produced fluid enters the device body 1, passing through the filter mesh 2, solid particles are separated from the fluid. Further, the fluid moves along the inlet channel 3. When oil or water enters the inlet channel 3, the flow restrictor 4, fixed by a spring 5 with a blocking channel 6, due to its density, under the action of the flow force of the produced fluid will move it towards the blocking channel 6, compressing the spring 5, the flow restrictor 4, acting as a valve, will close the blocking channel 6, the fluid will not enter the outlet channel 7, but will be directed back into the formation. When the gas enters the inlet channel 3, the force of the fluid flow with which it moves, due to the many times lower density of the gas, will not be enough to compress the spring 5 and close the blocking channel 6 with the flow restrictor 4, and the gas will enter the outlet channel 7. The gas, after passing outlet channel 7, passes through the outlet 8, and enters the inner cavity 9, in which it continues its movement along the tubing towards the wellhead. The blocking channel 6 is made with a narrowing in the central part, provides the ability to block or unblock the incoming fluid when changing from liquid to gas or vice versa due to the return of the spring 5 to its original state by the flow restrictor 4 in the inlet channel 3.

The device allows, due to the design of the blocking channel and the chamber with a flow restrictor, to prevent liquid fluid from entering the tubing. However, the device allows the gas to pass as it enters, thereby increasing the overall efficiency of natural gas production.

Claims (1)

A gas inflow control device, including the possibility of connection with tubing, channels, a flow restrictor, a filter, characterized in that a flow restrictor in the form of a ball is placed inside the inlet channel, on which one end of the spring is fixed on one side, and the other end is on the walls of the inlet channel, around the entrance to the blocking channel, which is made in the form of two cylinders with a narrowing between them, while the blocking channel is connected to the outlet channel, the end of the outlet channel through the outlet is connected to the internal cavity.

Images