RU220556U1 - VARIABLE FLOW RESISTANCE DEVICE - Google Patents

Abstract

The utility model relates to the petroleum industry, namely to equipment for operating oil wells, and can be used to control the flow of a fluid, such as formation fluid, as well as provide variable resistance to the flow of various desired and undesirable fluids in a fluid composition. The technical result of the claimed technical solution is to eliminate the possibility of communication between the internal cavity of the production string and the annulus, through the cavities of the body of the variable flow resistance device until the installation process of the production string is completed, due to the variable flow resistance device containing inlet chambers connected to the flow chamber by a channel with a tangential direction flow, partitions that support the circular movement of the incoming fluid mixture, holes in the partitions, made with the ability to divide the total flow into flows with different lengths of trajectories of liquids of different viscosities, and a drain hole into which a plug is installed, in the upper part of which there is a blind end hole , the plug is cylindrical, and on its outer side surface there is a ring-shaped recess; the plug is made of D16T aluminum alloy.

Description

The utility model relates to the petroleum industry, namely to equipment for operating oil wells, and can be used to control the flow of a fluid, such as formation fluid, as well as provide variable resistance to the flow of various desired and undesirable fluids in a fluid composition.

The closest in technical essence is the “DEVICE OF VARIABLE FLOW RESISTANCE”, according to the utility model patent RU No. 213824, dated 06/03/2022, published 09/29/2022, MPK E21B 43/12, E21B 34/08, B22F 10/28, made of metal containing formed by selective laser melting: inlet chambers connected to the flow chamber by a channel with a tangential flow direction, partitions supporting the circular motion of the incoming fluid mixture, holes in the partitions made with the ability to divide the total flow into flows with different lengths of trajectories of different viscosity liquids, and a drain hole.

The known device is installed on the outer surface of the pipe and lowered into the well with a string of casing pipes. During the descent process, drilling fluid is injected under pressure into the cavity of the production string. The design of the known device provides for constant communication between the internal cavity of the production string and the annulus. Communication with the annulus occurs through the drain hole, flow chamber, internal channels and inlet chambers. Thus, part of the drilling fluid supplied under pressure into the cavity of the production string during its descent enters the annulus. Unregulated leakage of drilling fluid under high pressure, in addition to loss of control over the technological parameters of the operation, can lead to uncontrolled destruction of the well walls, accompanied by rock spalling and blocking of the column.

The objective of the proposed technical solution is to create a device with variable flow resistance, eliminating the possibility of unregulated communication between the internal cavity of the mounted production string and the annulus.

The problem was solved by means of a variable flow resistance device containing inlet chambers connected to the flow chamber by a channel with a tangential flow direction, partitions supporting the circular motion of the incoming fluid mixture, holes in the partitions made with the ability to divide the total flow into flows with different trajectories. liquids of different viscosities, and a drain hole into which a plug is installed, in the upper part of which there is a blind end hole, the plug is cylindrical, and on its outer side surface there is a ring-shaped recess, the plug is made of aluminum alloy D16T.

The essence of the technical solution is illustrated by drawings, where figure 1 is a horizontal section of a device with variable flow resistance, figure 2 is a vertical section of a device with variable resistance to flow, figure 3 is a device with variable resistance to flow.

In fig. 1, fig. 2, fig. 3 shows: device 1 of variable flow resistance, system of 2 internal channels, inlet chamber 3, drain hole 4, flow chamber 5, channel 6, partitions 7, holes 8, plug 9, blind end hole 10, annular recess 11.

The variable flow resistance device is designed as follows.

The body of the variable flow resistance device 1 is made of metal, for example, a heat-resistant nickel alloy used in powder metallurgy and corresponding to GOST R 52802-2007. The body of the device 1 can be manufactured by any method known from the prior art, for example, by fusing granules of fine metal powder under the influence of the energy of a laser beam moving in accordance with a developed program. This method makes it possible to produce monolithic parts with arbitrary shapes of their internal voids. Making the body of the device 1 from a heat-resistant metal alloy allows it to be used at high temperatures, for example in injection wells, when they are treated with steam.

Device 1 contains inlet chambers 3 and a drain hole 4. Device 1 contains a flow chamber 5. The flow chamber 5 is made predominantly of a cylindrical shape. Channel 6 connecting the inlet chamber 3 and the flow chamber 5 is designed in such a way that the flow of the fluid mixture is directed into chamber 5 predominantly tangentially. The flow chamber 5 contains partitions 7, made in a shape that supports the circular movement of the incoming mixture. The partitions 7 have holes 8. The holes 8 are designed to divide the total incoming flow into several streams with trajectories of different lengths. A plug 9 is installed in the drain hole 4. The plug 9 is made in the form of a solid one-piece part, having a predominantly cylindrical shape. Plug 9, in its upper part, contains a blind axial hole 10. Hole 10 is made in communication with the flow chamber 5. Plug 9 is installed in the drain hole 4 by any method known from the prior art that ensures the tightness of the connection, for example, by seaming, threaded connection and others . Optionally, a ring-shaped recess 11 is made on the outer surface of the cylindrical plug 9. The annular recess 11 is located in the cavity of the production string pipe, in a plane oriented perpendicular to the axis of the plug 9. The plane in which the recess 11 is located intersects the blind axial hole 10. Optionally, plug 9 made of aluminum alloy D16T.

The variable flow resistance device is used as follows.

The variable flow resistance device 1 typically operates as part of an array of devices installed on the outer surface of the production string. Device 1 is installed on the side surface of the pipe and lowered into the well with a string of casing pipes. After lowering the production string to the required depth, the plugs 9 are cut off. The plugs 9 are cut off by any method known from the prior art, for example, using a downhole motor with a blade bit or a milling cutter. The cutting of the plugs 9 is carried out in the area of the ring-shaped recesses 11, which, together with the physical and mechanical characteristics of the D16T duralumin alloy, allows the procedure of cutting the plugs 9 to be carried out with minimal effort and energy consumption. As a result of cutting off the plug 9, the end hole 10 communicates the internal cavity of the production string with the annulus through the drain hole 4, the flow chamber 5, the internal channels 6 and the inlet chambers 3.

After cutting off the plugs 9, a pressure difference is created and the formation fluid begins to flow into the inlet chambers 3 of the device 1. Then, through channel 6, the fluid mixture enters the flow chamber 5. The main flow of the mixture enters the chamber 5 tangentially to its trajectory wall, thus creating circular movement of the liquid around the drain hole 4. As a result, the fluid mixture will move in the chamber 5 in a spiral until it eventually exits through the drain hole 4. Thus, the flow will experience less resistance when the fluid mixture passes to the drain hole 4 a shorter path, and vice versa, the flow will experience greater resistance in the case when the fluid mixture passes to the drain hole 4 along a longer path. Designs 7 force any part of the flow of the fluid mixture passing in the flow chamber 5 in a circle to continue such a circular movement through the chamber 5, but at least one of the holes 8 allows for a shorter passage of the fluid mixture from the exit from channel 6 to the drain hole 4 According to Bernoulli's law, a less viscous liquid, such as water, will travel a significantly longer distance than a more viscous liquid, such as oil. Consequently, a less viscous liquid will spend more energy overcoming resistance and, as a result, will enter the production column in a smaller volume. Thus, device 1 provides variable resistance to flow, depending on the degree of viscosity of the withdrawn formation fluid.

The use of a hermetically sealed plug 9 in device 1 eliminates the possibility of unregulated communication between the internal cavity of the production string and the annulus through device 1 of variable flow resistance. The use of aluminum alloy D16T, which is easily machined, for the manufacture of plug 9, in combination with the formation of a ring-shaped recess 11 on the outer surface of plug 9, allows, after completion of the descent of the production string, to cut plug 9 by any standard method known from the prior art.

The technical result of the claimed technical solution is to eliminate the possibility of communication between the internal cavity of the production string and the annulus, through the cavities of the body of the variable flow resistance device until the installation process of the production string is completed, due to the variable flow resistance device containing inlet chambers connected to the flow chamber by a channel with a tangential direction flow, partitions that support the circular movement of the incoming fluid mixture, holes in the partitions, made with the ability to divide the total flow into flows with different lengths of trajectories of liquids of different viscosities, and a drain hole into which a plug is installed, in the upper part of which there is a blind end hole, the plug is cylindrical, and on its outer side surface there is a ring-shaped recess; the plug is made of D16T aluminum alloy.

Claims (3)

1. A device of variable flow resistance, containing inlet chambers connected to the flow chamber by a channel with a tangential flow direction, partitions supporting the circular motion of the incoming fluid mixture, holes in the partitions made with the ability to divide the total flow into flows with different lengths of trajectories of different viscosities liquids, and a drain hole, characterized in that a plug is installed in the drain hole, in the upper part of which there is a blind end hole. 2. A device for variable flow resistance according to claim 1, characterized in that the plug is cylindrical, and on its outer side surface there is a ring-shaped recess. 3. A device for variable flow resistance according to claim 1, characterized in that the plug is made of D16T aluminum alloy.