RU2682388C1 - Device of fluid inflow control - Google Patents

Abstract

FIELD: oil industry.SUBSTANCE: invention relates to the oil industry and can be applied to control fluid production during the operation of oil reservoirs with zones of different permeability. Device is installed on the base pipe in the area of perforation holes between the filter elements and includes concentrically located elements, namely, a central symmetric stepped bushing located between the rows of perforations, fixedly mounted on the base pipe, stepped glasses-stops, located on both sides of the symmetrical stepped bushings on the other side of the rows of perforations, stepped bushes, mounted on a central symmetric stepped bushing and stepped cups-stops with the possibility of rotation. Symmetrically located cavities are formed between the fluid inflow control unit and the base pipe in the area of perforation holes, through holes are made on the end surface of stepped cups-stops along their axis, in the stepped sleeves there are end-through grooves, with the combination of which channels are formed for the passage of filtered fluid in the cavity.EFFECT: optimal conditions for fluid production are created, labor-intensive manufacturing and assembly of the device is reduced.8 cl, 8 dwg

Description

The invention relates to the oil industry and can be used to control fluid production during the operation of oil reservoirs with zones of different permeability.

This device refers to passive fluid flow control units and, depending on the operating conditions (reservoir geology, reservoir pressure, liquid or gaseous state of the produced product and its flow rate), it can be used as an independent link in the design of production wells, or as an additional means for optimization fluid flows in the wellbore.

A device for controlling the flow of formation fluid during operation of a horizontal well is known, including a flange with holes of a certain diameter, a strainer attached to it, located coaxially with the production string, along which a control line is connected, connected to a corresponding hole in the flange, and a return spring of the required rigidity is installed in the housing and a hydraulically controlled piston interacting with it, which laterally adjoins the housing and operating the cylinder, and the end of the piston opposite the spring communicates with the control line.

RF patent for utility model No. 166287, IPC Е21В 43/12, ЕВВ 34/10, publ. 11/20/2016.

A well-known system for regulating the inflow into the well, providing control of the inflow into the casing of the fluid coming from the outside of the casing, for example from a reservoir or an intermediate casing, containing the casing with an axial direction and a wall having a thickness, an inflow control valve having a body containing emphasis, with a length specified by the longitudinal axis of the housing, and a spring element movable relative to the housing and thereby regulating the flow of fluid passing through the valve from the inlet a mustache to the outlet of the casing, in which the valve is positioned so that the axial direction of the valve is perpendicular to the axial direction of the casing, and the spring element is configured to manifest its elastic properties in the direction of the specified axis of the valve and perpendicular to the axial direction of the casing, with the creation of elastic force, providing the ability to control the fluid flow through the valve from the inlet to the outlet of the housing, while the spring element is configured to Ota the diaphragm towards said abutment aperture secured closing.

RF patent №2551599, IPC Е21В 43/12, ЕВВ 34/08, publ. 05/27/2015.

The disadvantage of the inflow regulator is the low durability of its filter element, the size of which is smaller than the size of the valve, which will lead to its rapid maturation.

A device for passive control of a fluid in a flow control well for controlling a fluid flow from a formation, comprising a flow control element formed of a material with an adaptable shape with an open-cell structure and a hydrophilic polymer injected in an open-cell structure of the material with an adaptable shape in an amount sufficient so that the flow control element limits the flow of water flowing through it, and the hydrophilic polymer is adhered to the wall by cells of material with an adaptable shape and placed in openings of an open-cell structure to limit the flow of water through them.

RF patent №2540764, IPC Е21В 43/12, ЕВВ 21/08, publ. 02/10/2015.

A device for controlling fluid flow, comprising a tubular diode sleeve having a diode hole; a tubular intra-channel sleeve mounted concentrically inside the diode sleeve, the intra-channel sleeve comprising an internal channel in fluid communication with the diode hole; and a tubular external channel sleeve, inside which a diode sleeve is concentrically mounted, wherein the external channel sleeve contains an external channel in fluid communication with the diode hole; in which the shape of the diode hole, the position of the inner channel relative to the diode hole and the position of the outer channel relative to the diode hole determine the resistance to the flow of fluid moving into the inner channel from the outer channel, and another resistance to the flow of fluid moving to the outer channel from the inner channel.

RF patent No. 2529316, IPC Е21В 43/12, ЕВВ 21/08, publ. 09/27/2014.

A device for leveling the flow of an oil well is known, comprising a support pipe, on which a filter element is mounted between the retaining rings, connected by a channel network with an opening in the pipe, a channel network for providing high hydraulic resistance is made with a multiple change in the direction of fluid flow and / or with multiple narrowing and expansion of the flow, on the inner surface of the retaining ring holding the filter element on the channel network side, grooves are provided for passage As a result of the product being produced, the channel network is made on rings installed on the support pipe in the amount necessary to create the necessary hydraulic resistance, moreover, protrusions and depressions are made on the ends of the rings, providing radial orientation of the rings relative to each other, and before and after the rings with the channel network on the pipe adapter rings with holes for passing the extracted product are installed. Rings with a network of channels are closed by a casing with a fixed stepped ring, on the inner surface of which grooves are made for the passage of the produced product. Behind the stepped ring in the hole for passing the extracted product into the supporting pipe, an inflow regulator is installed on the thread, made with a through hole, the diameter of which is selected depending on the intensity of the inflow at the installation site of the device. The inflow regulator is closed by a cap, which is fixed on the pipe with screws. The cover, casing and flow regulator are sealed with rubber rings.

RF patent for utility model No. 173 196, IPC Е21В 43/12, published August 16, 2017.

In this solution, a labyrinth flow pattern is considered, in which a possible clogging of channels is associated with a sharp change in flow and the appearance of stagnant zones in which small particles passing through the filter element are collected.

The technical problem solved by the developed device is to create optimal conditions for the production of fluid. as well as reducing the complexity of manufacturing and assembling the device

The solution to this problem is achieved by the fact that the fluid flow control device installed on the base pipe in the area of the perforation holes between the filter elements, consisting of concentrically arranged elements, includes a central symmetrical step sleeve located between the rows of perforation holes fixed on the base pipe, stepped glasses - stops located on both sides of the symmetrical stepped sleeve on the other side of the rows of perforations thi, stepped bushings mounted on a central symmetrical stepped sleeve and stepped cups - stops with the possibility of rotation, while symmetrically located cavities are formed between the fluid inflow control unit and the base pipe in the area of the perforation holes, stops on the end surface of the stepped cups along their axis through holes are made, in step bushings - end through grooves, when combined, channels are formed for the passage of the filtered fluid into the cavity.

In addition, the number of through holes of glasses - stops, end-to-end through grooves of stepped bushings is the same.

In addition, two rows of recesses are made on the outer surface of the central symmetrical step sleeve for locating the fixing balls.

In addition, holes are made in the stepped sleeve for arranging the balls and grooves on the outer surface for arranging elastic elements made in the form of rings, pressing the balls and fixed with a pin against rotation.

In addition, the through holes of the glasses - stops, end through grooves of the stepped bushings are located radially with equal angular pitch in a particular sector.

In addition, the holes made in the stepped sleeve and the recesses made on the outer surface of the central symmetrical stepped sleeve for locating the fixing balls are located with an angular pitch equal to the angular pitch of the through holes of the glasses - stops and end-to-end grooves of the stepped bushings.

In addition, the filtering elements are made in the form of a cylindrical spiral from a high-precision profile of a V-shape, creating a rigid screen with annular slits in size from 50 to 1000 microns and with a tolerance for a slit width of up to 15 microns.

In addition, the parameters of the fluid flow control device are calculated according to the developed mathematical program.

The invention is illustrated by drawings.

FIG. 1 is a general view of the arrangement of a fluid flow control device on a base pipe between two filter elements;

FIG. 2 is a general view of a fluid flow control device;

FIG. 3 - section AA, the location of the holes in the glass-stop;

FIG. 4- section BB, the location of the end-to-end grooves in the stepped bushings;

FIG. 5 - section bb, the location of the fixing balls;

FIG. 6 - section GG, section along the perforations;

FIG. 7 - view D, filter element;

FIG. 8 is a view of E, an open channel for the passage of fluid.

The fluid flow control device 1 consists of concentrically arranged elements installed between the filter elements 2 in the area of the perforation holes 3, made on the base pipe 4 of the well shank, the diameter of which is calculated in real time using the developed mathematical program. The filtering elements 2 are made, for example, in the form of a cylindrical spiral of a high-precision profile of a V-shape, creating a rigid screen with annular slits in size from 50 to 1000 microns and with a tolerance for a slit width of up to 15 microns. Between the node for regulating the influx of fluid 1 and the base pipe 4 in the zone of location of the perforations 3 symmetrically located cavities are formed.

The fluid flow control device 1 includes a central symmetrical step sleeve 5 located between the rows of perforation holes 3 fixed on the base pipe 4 of the shank with locking threaded screws 6 with a pointed end, with a countersunk head with a turnkey internal hexagon, on the outer surface of the central symmetrical the stepped sleeve 5 is made of two rows of recesses 7 located with equal angular pitch ϕ for the location of the locking elements, for example, in the form of two balls 8.

On two sides of the central symmetrical step sleeve 5 on the other side of the rows of perforation holes 3 are stepped glasses - stops 9, on one side in which filter elements 2 are installed. On the end surface of the glasses - stops 9, through holes 10 are made radially along their axis with equal angular pitch ϕ in a certain sector, the diameter and angular pitch are calculated according to the developed mathematical program.

On the central symmetrical step sleeve 5 and step cups - stops 9, step sleeves 11 are mounted for rotation, with holes 12 for arranging balls 8 made with equal angular pitch ϕ, elastic elements 13 are located in grooves on the outer surface of the step sleeve 11 above holes 12 made in the form of rings, pressing balls 8 and fixed against rotation by a pin 14. At the ends of the stepped sleeves 11 mounted on the stepped glasses - stops 9 are made end-to-end grooves 15 of width b, located nnye radially with equal angular pitch φ in a particular sector, the width of the grooves and the angular pitch is calculated using the developed mathematical program.

When turning the stepped sleeves 11 and combining the end-to-end grooves with the through holes 10 of the glasses - stops 9, channels are formed for the passage of the filtered fluid in the cavity G (Fig. 8)

The angular pitch of the recesses 7 for the location of the locking balls 8, holes 12 for the location of the balls 8, through holes 10 glasses - stops 9, end-to-end grooves 14 of the stepped bushings 11 are the same.

The number of through holes 10 glasses - stops 9, end through grooves 14 of the stepped bushings 11 are the same.

The number of fluid flow control devices located along the length of the liner is determined by calculation according to the developed mathematical program in accordance with the parameters of the permeability zones of the formation.

A device for regulating fluid flow works as follows.

In accordance with the obtained initial information about the state of the reservoir pressure, the liquid or gaseous state of the produced product and its flow rate, and in order to ensure a uniform distribution of fluid absorption along the entire length of the liner, the volume of produced fluid in this section of the well is determined. The known diameter d of the through holes 10 glasses - stops 9 and the volume of fluid passing through each hole. The number of holes required to pass the volume of produced fluid in this section of the well is determined.

The opening of channels for the passage of fluid is carried out by turning the stepped sleeve 11 to align the end-to-end grooves 15 with the through holes 10 of the glasses - stops 9.

Depending on the number of holes 10 necessary for the passage of the volume of produced fluid in this section of the well, the angle of rotation of the stepped sleeve 11 is determined, and the required number of channels for the passage of fluid is opened.

After opening the necessary number of channels for the passage of fluid, the fixation of the stepped sleeve 11 is carried out by balls 8, which by the action of the annular spring 13 fall into the recesses 7.

The fluid flow passing through the slotted lattice of the filtering elements 2 moves along the surface of the base pipe 4, passes through the channels formed by combining the end through grooves 14 with the through holes 10 of the glasses - stops 9, enters the cavity G, and then flows through the perforation holes 3 into the total flow inside the base pipe 4.

The use of this device provides equalization of inflow along the wellbore, allows you to adjust the pressure drop in the channel network, improves the manufacturability of the manufacture and assembly of the device.

Claims (8)

1. A fluid flow control device mounted on the base pipe in the area of the perforation holes between the filter elements, consisting of concentrically arranged elements, characterized in that the concentrically arranged elements include a central symmetrical stepped sleeve located between the rows of perforation holes fixed to the base pipe , stepped cups-stops, located on both sides of the symmetrical stepped sleeve on the other side of the rows of perforations ion holes, stepped bushings mounted on a central symmetrical stepped sleeve and stepped stop cups with the possibility of rotation, while symmetrically located cavities are formed between the fluid inflow control unit and the base pipe in the area of the perforation holes, and along the end surface of the stepped stop cups along their axes are made through holes, in step bushings - end through grooves, when combined which channels are formed for the passage of the filtered fluid into olosti. 2. The fluid flow control device according to claim 1, characterized in that the number of through holes of the cups-stops, end through grooves of the stepped sleeves is the same. 3. The fluid flow control device according to claim 1, characterized in that on the outer surface of the central symmetrical step sleeve there are two rows of recesses for arranging the fixing balls. 4. The fluid flow control device according to claim 1, characterized in that holes are provided on the outer surface of the stepped sleeve for arranging balls and grooves for arranging elastic elements made in the form of rings, pressing balls and secured with a pin to prevent rotation. 5. The fluid flow control device according to claim 1, characterized in that the through holes of the cups-stops, end through grooves of the stepped sleeves are located radially with equal angular pitch in a particular sector. 6. The fluid flow control device according to claim 1, characterized in that the holes made in the stepped sleeve and the recesses made on the outer surface of the central symmetrical stepped sleeve for locating the fixing balls are located with an angular pitch equal to the angular pitch of the through holes of the glasses - stops and end-to-end grooves of stepped bushings. 7. The fluid flow control device according to claim 1, characterized in that the filtering elements are made in the form of a cylindrical spiral of a V-shaped high-precision profile, creating a rigid screen with annular slots from 50 to 1000 microns in size and with a gap width of up to 15 microns. 8. The fluid flow control device according to claim 1, characterized in that its parameters are calculated according to the developed mathematical program.

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