A dual flow adaptive inflow control device for oil wells

Abstract

The application discloses a double-flow-channel adaptive inflow control device for well liquid, which is characterized by comprising a production flow channel composed of corresponding liquid production overflow holes in upper, movable and lower grating plates, and another identification flow channel arranged in a front chute, a lower grating plate and a rear chute and assembled with a shell; pressure balance holes one and two in the front chute and the shell correspond to each other and penetrate the sliding chamber in the front chute and an oil pipe; a pressure introduction hole in the rear chute penetrates the sliding chamber and the identification flow channel; well liquid enters the identification flow channel from an inlet of the identification flow channel in the shell, flows out from an outlet of the identification flow channel in the shell, and a flow control switch can automatically open or close the production flow channel. The application provides two flow paths for external fluid to enter the oil pipe, namely the identification flow channel and the production flow channel, and has the advantages of simple structure, long service life, good water control effect, reliable work and remarkable use effect.

Description

TECHNICAL FIELD

[0001] The present application relates to an oil well fluid inflow control device in petroleum engineering, in particular to a double-channel adaptive oil well fluid inflow control device. BACKGROUND

[0002] Horizontal wells are widely used in oil and gas exploitation as an efficient and economical development method. However, due to the "toe effect" and reservoir heterogeneity, the production pressure differentials of different sections of horizontal wells are different, which leads to problems such as bottom water fingering. The invasion of bottom water into the wellbore causes the water cut of produced fluid to rise rapidly. To solve this problem, the current common method is to install an inflow control device (ICD) on the completion section to generate an additional pressure drop, thereby ensuring the uniformity of the inflow profile along the entire horizontal section and eliminating this imbalance.

[0003] After searching, the following related patent technologies are found: Application No. CN201811177608.6 discloses a variable-channel inflow control device, a production string, and an oil production nipple. The device is designed based on Bernoulli's principle and controls the opening of the device by moving the internal movable float. When the inflow is water, the fluid flow rate is fast, the surface pressure of the float is small, and the float moves in the direction of reducing the opening. When the inflow is oil, the fluid flow rate is slow, the surface pressure of the float is large, and the float moves in the direction of increasing the opening or has this trend. Therefore, the resistance of the device to water is much greater than that to oil.

[0004] Application No. CN202110818225.8 discloses an inflow control device, a water control nipple, and a production string. The device has different inflow paths for water and oil by designing a special inflow chamber. The device generally has a cyclone chamber. The formation fluid flows tangentially into the cyclone chamber and flows out from the middle aperture. When the inflow is water, the fluid tends to flow out from the middle aperture after rotating multiple times due to the low viscosity and high density of water. When the inflow is oil, the fluid tends to rotate a few times or directly flow to the middle aperture due to the high viscosity and low density of oil. Therefore, the flow path of water is much longer than that of oil, and the resistance of the device to water is much greater than that to oil. Application No. CN201811320131.2 discloses a downhole fluid flow control system operated by differential pressure switches. The device has two flow channels: a sensing flow channel and a production flow channel. The device controls the up-down movement of the valve core to open or close the flow channel based on the pressure acting on the valve element and the pressure acting on the sealing element. The pressure acting on the valve element is determined by the force area of the valve element and the upstream pressure; the pressure acting on the sealing element is determined by the force area of the sealing element and the pressure at the end of the sensing flow channel. The area of the sealing element is larger than that of the valve element. When the inflow is water, the pressure at the end of the sensing flow channel is higher, and the pressure acting on the sealing element is greater than that acting on the valve element, which drives the valve core to move upwards to close the flow channel. When the inflow is oil, the pressure at the end of the sensing flow channel is small, so the pressure acting on the sealing element is less than that acting on the valve element, which drives the valve core to move downwards to open the flow channel.

[0005] In the prior art described above:

[0006] For the floating disc type, the floating disc is easily damaged due to erosion, which weakens or invalidates the control ability thereof;

[0007] For the flow channel type, the special chamber is easily damaged due to erosion, and the slow flow rate of crude oil and the small outlet easily lead to fouling and plugging of the device;

[0008] For the flow channel control type, the device contains flexible components, which are easily damaged due to the harsh conditions at the bottom of the well, thus invalidating the device.

[0009] Therefore, there is an urgent need to invent a flow control device with good water control effect, reliable operation, strong adaptability and long service life. SUMMARY

[0010] To solve the above-mentioned problems, the present application provides a double-flow-channel self-adaptive oil well production fluid inflow control device, which is simple in structure and reliable in operation, can be closed or opened according to the viscosity or properties of the incoming flow, does not contain flexible components and is not easily damaged, improves the control effect on produced water, prolongs the service life of the control device and reduces production costs.

[0011] The present application adopts the following technical solutions:

[0012] A double-flow-channel self-adaptive oil well production fluid inflow control device is provided with a production flow channel, wherein: the flow control mechanism includes an upper grid plate, a lower grid plate and a flow control switch installed therein, and a cover plate fixes the flow control mechanism in the housing; the flow control switch includes a movable grid plate, a front pressure receiving member, a front sliding block installed at one end of the movable grid plate and a rear sliding block installed at the other end; the production flow channel is composed of the corresponding liquid production overflow holes in the upper grid plate, the movable grid plate and the lower grid plate, when the oil well production fluid is oil, the oil flows into the window of the cover plate and flows out of the outlet of the production flow channel in the housing; another identification flow channel is arranged in the front sliding groove member, the lower grid plate and the rear sliding groove member and assembled with the housing; the pressure balance holes one and two in the front sliding groove member and the housing correspond to each other and are in communication with the sliding chamber in the front sliding groove member and the oil pipe;

[0013] The pressure introduction hole in the rear sliding groove member is in communication with the sliding chamber and the identification flow channel thereof; the oil well production fluid enters the identification flow channel from the inlet of the identification flow channel in the housing and flows out of the outlet of the identification flow channel in the housing; the flow control switch can slide in the sliding chamber of the front sliding groove member and the rear sliding groove member according to the pushing force received by the front pressure receiving member and the front sliding block and the counter-pushing force received by the rear sliding block, and automatically open or close the production flow channel.

[0014] Preferably, the sliding chamber in the front sliding groove member is a U-shaped groove, and the right end is through the body of the front sliding groove member, and the left end is through the center hole of the front sliding groove member; one end of the front compression member is connected with the front sliding block installed at one end of the movable shutter, and the other end is installed in the center hole of the front sliding groove member, and when the movable shutter moves left, the front compression member and the front sliding block fixed with the movable shutter can move in the sliding chamber of the front sliding groove member; the pressure balance holes one and two correspondingly arranged in the front sliding groove member and the shell are through the left bottom of the sliding chamber in the front sliding groove member.

[0015] Preferably, the front compression member is a non-equal-diameter cylinder, and the small-outer-diameter end is installed in the front sliding block, the two ends of the front sliding block are fixed with the movable shutter, and the large-diameter end of the front compression member can move in the center hole of the front sliding groove member; the height of the sliding chamber in the front sliding groove member is greater than the thickness of the front compression member and the front sliding block.

[0016] Preferably, the inner cavity of the rear sliding groove member is a non-equal-width through cavity provided with a sliding limiting step, and the through cavity on the side of the rear sliding block is wide, which is a sliding chamber, the width of the sliding chamber is greater than the width of the rear sliding block installed at one end of the movable shutter, and the movable shutter can drive the rear sliding block to move in the sliding chamber of the rear sliding groove member.

[0017] Preferably, the cavity on the right side of the sliding limiting step in the rear sliding groove member and the shell is a pressure introduction chamber, the pressure introduction hole is arranged in the lower body of the pressure introduction chamber and is through the identification flow channel arranged in the rear sliding groove member.

[0018] Preferably, the movable shutter, the upper shutter and the lower shutter are all plate-shaped bodies, and the positions of the liquid production overflow grooves correspondingly arranged in the plate-shaped bodies correspond and have the same number; the width of the movable shutter is smaller than the widths of the upper shutter and the lower shutter, and the length of the movable shutter is greater than the lengths of the upper shutter and the lower shutter, and the width of the liquid production overflow groove arranged in the movable shutter is smaller than the widths of the liquid production overflow grooves in the upper shutter and the lower shutter.

[0019] Preferably, the two sides of the corresponding surfaces of the upper shutter and the lower shutter are provided with bosses, the sum of the heights of the bosses on the two sides of the upper shutter and the lower shutter is greater than the thickness of the movable shutter, and the width between the bosses on the two sides is greater than the width of the movable shutter.

[0020] Preferably, the shell is a non-equal-width through frame-shaped body, the narrow groove formed on the left side of the frame-shaped body is an identification flow channel entrance groove, and the through groove in the center of the shell bottom plate is a production flow channel outlet, the width of the production flow channel outlet is greater than the width of the liquid production overflow holes distributed in the upper shutter and the lower shutter; the widths of the upper shutter and the lower shutter are consistent with the widths of the front sliding groove member and the rear sliding groove member.

[0021] Preferably, the identification flow channel is formed by the flow passage one in the front chute member, the flow passage two in the lower grid plate, the flow passage three in the rear chute member and the bottom surface of the shell; the cross-sectional area of the identification flow channel formed by the combination is less than 1 square centimeter, the ratio of the length of the identification flow channel to the minimum cross-sectional dimension is greater than 50; the identification flow channel inlet slot is arranged on the left side of the shell to communicate with the identification flow channel, and the pressure introduction hole is through the identification flow channel at the front end of the identification flow channel outlet.

[0022] Preferably, the cover plate is a frame-shaped body with the same shape and the same outer peripheral dimension as the shell, and a pressing step is arranged on the inner side of the lower edge of the window; the cover plate is connected with the shell by bolts.

[0023] Preferably, the double-flow-channel adaptive oil well fluid inflow control device is installed outside the oil pipe at the top of the screen pipe, and two or more double-flow-channel adaptive oil well fluid inflow control devices can be installed in the circumferential direction of the oil pipe; the production flow channel outlet is communicated with the assembly through hole in the oil pipe wall.

[0024] Compared with the prior art, the application has the following remarkable use effects:

[0025] 1. The device is installed at the corresponding position of the oil pipe to provide two flow paths for external fluid to enter the oil pipe, i.e. the identification flow channel and the production flow channel. The identification flow channel has a long and narrow feature, and different pressure conditions are formed at the end of the identification flow channel according to the nature of the incoming flow. Specifically, the pressure loss of low-viscosity fluid passing through the identification flow channel is small, and the pressure formed at the end of the identification flow channel is large; the pressure loss of high-viscosity fluid passing through the identification flow channel is large, and the pressure formed at the end of the identification flow channel is small. The production flow channel is opened or closed based on the size of the pressure at the end of the identification flow channel.

[0026] 2. The application is a full-metal structure and does not contain flexible components, and the use effect is almost independent of the performance of the material, is corrosion-resistant, reliable in operation and long in service life.

[0027] 3. The flow control switch is not affected by the production flow channel pressure, so the flow area of the production flow channel is easy to adjust. According to the reservoir conditions, the flow area of the production flow channel can be adjusted by the shape, length, width and number of the fluid flow holes in the movable grid plate.

[0028] 4. The movable grid plate is controlled by the pressure in the sliding chambers at the two ends of the front and rear chute members provided by the identification flow channel, and the movable grid plate is only located at the maximum displacement position in the sliding chambers at the two ends of the front and rear chute members. Therefore, the flow control switch only has two states, i.e. closed and opened, and the water control effect is better and the operation is more reliable.

[0029] 5. The device has the advantages of simple structure, long service life, good water control effect, reliable operation, remarkable use effect and application value and good economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and are intended to provide a further understanding of the application, and are made a part of the specification. The drawings are not intended to limit the scope of the application in any way.

[0031] Figure 1 is a schematic view of the three-dimensional structure of the present application.

[0032] Figure 2 is a schematic view of the open state of the present application.

[0033] Figure 3 is a schematic view of the assembly position of the flow control mechanism of the present application.

[0034] Figure 4 is a bottom view of the flow control mechanism of the present application.

[0035] Figure 5 is a front view of the present application.

[0036] Figure 6 is a top view of the present application.

[0037] Figure 7 is a schematic view of the closed state of the present application.

[0038] in the drawings:

[0039] front pressure receiving member 4,

[0040] front sliding groove member 1, pressure balance hole 101, flow passage 102;

[0041] cover plate 2, bolt 3, front pressure receiving member 4, front sliding block 5, movable louver 6, upper louver 7, lower louver 8, flow passage 801, rear sliding block 9, rear sliding groove member 10, pressure introduction hole 1001, flow passage 1002, pressure introduction chamber 1003, housing 11, pressure balance hole 1101, production flow passage outlet 1102, identification flow passage outlet 1103, identification flow passage inlet groove 1104, external ambient pressure PI, internal pressure of oil pipe P2, front pressure receiving member thrust force Fl, rear sliding block counterthrust force F2, front sliding block thrust force F3, pressure at the end of the identification flow passage P2+f(DP). DETAILED DESCRIPTION

[0042] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and are intended to provide a further understanding of the application, and are made a part of the specification. The drawings are not intended to limit the scope of the application in any way.

[0043] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0044] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0045] Referring to Figure 1 - Figure 7 A double-channel adaptive inflow control device for oil well production fluid, provided with a production channel, wherein:

[0046] The flow control mechanism includes an upper grid plate 7 and a lower grid plate 8, and a flow control switch installed therein, and the cover plate 2 fixes the flow control mechanism in the shell 11;

[0047] The flow control switch includes a movable grid plate 6, a front pressure receiving member 4 and a front sliding block 5 installed at one end of the movable grid plate 6, and a rear sliding block 9 installed at the other end of the movable grid plate 6;

[0048] The production channel is composed of the production fluid flow holes corresponding in position in the upper grid plate 7, the movable grid plate 6 and the lower grid plate 8, when the oil well production fluid is oil, the oil flows in from the window of the cover plate 2 and out from the production channel outlet 1102 in the shell 11;

[0049] Another identification channel is arranged in the front sliding groove member 1, the lower grid plate 8 and the rear sliding groove member 10 and assembled with the shell 11;

[0050] The pressure balance hole one 101 in the front sliding groove member 1 and the pressure balance hole two 1101 in the shell 11 correspond to each other and pass through the sliding chamber in the front sliding groove member 1 and the oil pipe;

[0051] The pressure introduction hole 1001 in the rear sliding groove member 10 passes through the sliding chamber and the identification channel thereof;

[0052] The oil well production fluid enters the identification channel from the identification channel inlet in the shell 11 and flows out from the identification channel outlet 1103 in the shell 11;

[0053] The flow control switch can slide in the sliding chamber of the front sliding groove 1 and the rear sliding groove 10 according to the thrust force received by the front pressure receiving member 4 and the front sliding block 5 and the counter-thrust force received by the rear sliding block 9, and automatically open or close the production flow channel.

[0054] The device is installed at a corresponding position of the oil pipe, and provides two flow paths for the external fluid, i.e. the oil well production fluid, to enter the oil pipe, i.e. an identification flow channel and a production flow channel. The identification flow channel is arranged in the front sliding groove 1, the lower grid plate 8 and the rear sliding groove 10, has a long and narrow feature, and according to the nature of the incoming fluid, different pressure conditions are formed at the pressure introduction hole 1001 at the end of the rear sliding groove 10.

[0055] Specifically, the pressure loss of the low-viscosity fluid is small when passing through the identification flow channel, and the pressure at the end of the identification flow channel is large; the pressure loss of the high-viscosity fluid is large when passing through the identification flow channel, and the pressure at the end of the identification flow channel is small. The production flow channel is closed or opened by the flow control switch based on the pressure at the end of the identification flow channel.

[0056] The device has a simple structure and reliable work, and provides two channels for the fluid from the outside of the device to enter the oil pipe, one of which is a production flow channel for producing the expected fluid, and the other is an identification flow channel for identifying the nature of the incoming fluid. By identifying the viscosity of the incoming fluid, a large resistance is generated when the incoming fluid is water, and the production flow channel is closed by the movable grid plate 6 in the flow control switch, thereby preventing water flow, and the production flow channel is adaptively opened or closed according to the identification result. The device is entirely made of metal materials and does not contain flexible components, can adapt to harsh working conditions underground, is not easy to be damaged, and has significant use effect.

[0057] Based on the above-mentioned embodiment one, the present application also has the following embodiments:

[0058] A preferred embodiment: the sliding chamber arranged in the front sliding groove 1 is a U-shaped groove, the right end of which is through the body of the front sliding groove 1, and the left end is through the center hole of the front sliding groove 1; one end of the front pressure receiving member 4 is connected with the front sliding block 5 installed at one end of the movable grid plate 6, and the other end is installed in the center hole of the front sliding groove 1, when the movable grid plate 6 moves left, the front pressure receiving member 4 and the front sliding block 5 fixed with the movable grid plate 6 can move in the sliding chamber of the front sliding groove 1; the pressure balance hole one 101 and the pressure balance hole two 1101 correspondingly arranged in the front sliding groove 1 and the shell 11 are through the left bottom of the sliding chamber in the front sliding groove 1. Different shaped holes and grooves are arranged in the front sliding groove 1, the center hole is used to accommodate the front pressure receiving member 4, and the U-shaped groove is used to accommodate the front sliding block 5. The pressure balance hole one 101 and the pressure balance hole two 1101 are arranged at the intersection of the U-shaped groove and the center hole in the front sliding groove, so as to ensure that the space formed by the front pressure receiving member 4 and the front sliding block 5 in the front sliding groove 1 is communicated with the inside of the oil pipe.

[0059] Preferred embodiment: see Figure 1 and Figure 5 , the front pressure receiving member 4 is a non-equal diameter cylinder and the small outer diameter end is installed in the front slider 5, the two ends of the front slider 5 are fixed together with the movable shutter 6, and the large diameter end of the front pressure receiving member 4 can move in the center hole of the front sliding groove member 1; the empty height of the sliding chamber in the front sliding groove member 1 is greater than the thickness of the front pressure receiving member 4 and the front slider 5.

[0060] Preferred embodiment: see Figure 5 and Figure 6 , the inner cavity of the rear sliding groove member 10 is a non-equal width through cavity with a sliding limit step and is located on the side of the rear slider 9, and the through cavity on the side of the rear slider 9 is a sliding chamber, the width of the sliding chamber is greater than the width of the rear slider 9 installed on one end of the movable shutter 6, and the movable shutter 6 can drive the rear slider 9 to move in the sliding chamber of the rear sliding groove member 10.

[0061] Preferred embodiment: the chamber synthesized by the rear sliding groove member 10 and the shell 11 on the right side of the sliding limit step is the pressure introduction chamber 1003, the pressure introduction hole 1001 is arranged in the lower body below the pressure introduction chamber 1003 and penetrates the identification flow channel arranged in the rear sliding groove member 10. The opening or closing of the production flow channel depends on the movement of the flow control switch. The flow control switch is composed of the front pressure receiving member 4, the front slider 5, the movable shutter 6 and the rear slider 9. The movement of the flow control switch depends on the force condition of the front pressure receiving member 4, the rear slider 9 and the front slider 5. The force of each component position is equal to the product of the force area of each component position and the pressure intensity of each component position. The force area has the following relationship: the force area A2 of the rear slider 9 is equal to the sum of the force area A1 of the front pressure receiving member 4 and the force area A3 of the front slider 5. The front pressure receiving member 4 is subjected to the external environment pressure P1, the front slider 5 is subjected to the internal pressure P2 of the oil pipe, and the rear slider 9 is subjected to the pressure P2+f(DP) at the end of the identification flow channel. The DP is the production pressure difference, which is equal to the difference between the external environment pressure P1 and the internal pressure P2 of the oil pipe. The f(DP) is a function of the production pressure difference DP, which is affected by the fluid viscosity and the shape of the identification flow channel. The greater the fluid viscosity, the greater the pressure loss, and the smaller the f(DP). If the force direction of the front pressure receiving member 4 is positive, the pressure direction of the front slider 5 is positive, and the pressure direction of the rear slider 9 is negative. Therefore, the force condition F of the flow control switch is:

[0062] F=P1*A1+P2*A3-(P2+f(DP))*A2

[0063] The force area relationship is brought into the above formula, and the following formula is obtained:

[0064] F=DP*A1-f(DP)*A2

[0065] Therefore, the force condition of the flow control switch is only related to the production differential pressure DP, the force area A1 of the front pressure receiving member 4, and the force area A2 of the rear sliding block 9. The flow control switch is biased to one side or has a tendency to be biased to one side according to the positive or negative of the force condition F.

[0066] The identification flow channel is used for identifying fluid and is in a normally open state, and both oil and water can pass through. However, the water and the oil have different pressure intensities at the position of the pressure introduction hole 1001, so the force conditions of the rear sliding block 9 are different, which can make the movable grid plate 6 move left and right in the direction shown in the drawings.

[0067] The left and right movements of the movable grid plate 6 can further control the opening and closing of the production flow channel. Therefore, when the external flow is water, the production flow channel is closed, and the water can only pass through the identification flow channel to enter the oil pipe; when the external flow is oil, the production flow channel is opened, and the oil passes through the identification flow channel and the production flow channel to enter the oil pipe.

[0068] The upper grid plate 7, the lower grid plate 8, and the movable grid plate 6 are all provided with production fluid overflow holes, and the upper grid plate 7 is fixed with the lower grid plate 8. When the flow control switch is biased to one side, the production fluid overflow holes in the upper grid plate 7, the lower grid plate 8, and the movable grid plate 6 are aligned, and the oil in the oil well production fluid can pass through the production flow channel to enter the inside of the oil pipe; when the flow control switch is biased to the other side, the production fluid overflow hole in the movable grid plate 6 is staggered with the production fluid overflow holes in the upper grid plate 7 and the lower grid plate 8, and the external fluid is blocked by the movable grid plate 6 and cannot enter the oil pipe.

[0069] According to the above, after the low-viscosity fluid passes through the identification flow channel, a large pressure intensity is formed at the end of the identification flow channel, the force condition F is negative due to the large f(DP), the flow control switch is biased to one side or has a tendency to be biased to one side, and the production flow channel is closed or remains closed; after the high-viscosity fluid passes through the identification flow channel, a small pressure intensity is formed at the end of the identification flow channel, the force condition F is positive due to the small f(DP), the flow control switch is biased to the other side or has a tendency to be biased to the other side, and the production flow channel is opened or remains opened.

[0070] A preferred embodiment: the movable grid plate 6, the upper grid plate 7, and the lower grid plate 8 are all plate-shaped bodies, and the positions of the corresponding production fluid overflow grooves in the plate-shaped bodies correspond to each other and have the same number; the width of the movable grid plate 6 is smaller than the widths of the upper grid plate 7 and the lower grid plate 8, the length of the movable grid plate 6 is greater than the lengths of the upper grid plate 7 and the lower grid plate 8, and the width of the production fluid overflow groove arranged in the movable grid plate 6 is smaller than the widths of the production fluid overflow grooves in the upper grid plate 7 and the lower grid plate 8.

[0071] A preferred embodiment is that the upper gate plate 7 and the lower gate plate 8 are provided with protrusions on both sides of the corresponding surfaces, the sum of the heights of the protrusions on both sides of the upper gate plate 7 and the lower gate plate 8 is greater than the thickness of the movable gate plate 6, and the width between the protrusions on both sides is greater than the width of the movable gate plate 6. The lower gate plate 8 and the upper gate plate 7 cooperate to form a cavity for accommodating the movable gate plate 6, and when the upper gate plate 7 and the lower gate plate 8 are stacked together, the movable gate plate 6 can move left and right therein. The cavity formed has a certain gap with the movable gate plate 6, and the existence of the gap makes the movable gate plate 6 not in direct contact with the upper gate plate 7 and the lower gate plate 8, thereby reducing the moving resistance of the movable gate plate 6. Due to the existence of the gap, there will be a certain leakage when the device is closed, but the leakage amount is very small relative to the production flow, and thus can be ignored.

[0072] A preferred embodiment is that the shell 11 is a non-equal-width through frame, the narrow slot formed on the left side of the frame is an identification flow passage inlet slot 1104, and the through slot in the center of the bottom plate of the shell 11 is a production flow passage outlet 1102, the width of the production flow passage outlet 1102 is greater than the width of the distribution of the liquid production overflow holes in the upper gate plate 7 and the lower gate plate 8; the width of the upper gate plate 7 and the lower gate plate 8 is consistent with the width of the front and rear sliding chute members 1 and 10. The upper gate plate 7 and the lower gate plate 8 are provided with liquid production overflow holes at the same positions, and the positions of the upper gate plate 7 and the lower gate plate 8 are fixed; the movable gate plate 6 is provided with liquid production overflow holes corresponding to the upper gate plate 7 and the lower gate plate 8, when the flow control switch is biased to one side, the liquid production overflow holes in the movable gate plate 6 are aligned with the positions of the liquid production overflow holes in the upper gate plate 7 and the lower gate plate 8 at the same time, and the external fluid can enter the inside of the oil pipe through the liquid production overflow holes; when the flow control switch is biased to the other side, the liquid production overflow holes in the movable gate plate 6 are staggered with the liquid production overflow holes in the upper gate plate 7 and the lower gate plate 8, and the external fluid is blocked by the movable gate plate 6 and cannot enter the oil pipe.

[0073] A preferred embodiment is that the identification flow passage is formed by the overflow slot one 102 in the front sliding chute member 1, the overflow slot two 801 in the lower gate plate 8, the overflow slot three 1002 in the rear sliding chute member 10, and the bottom surface of the shell 11; the cross-sectional area of the identification flow passage formed by the abovementioned members is less than 1 square centimeter, and the ratio of the length of the identification flow passage to the minimum cross-sectional dimension is greater than 50; the identification flow passage inlet slot 1104 is arranged on the left side of the shell 11 as the identification flow passage inlet and is in communication with the identification flow passage, and the pressure introduction hole 1001 is in communication with the identification flow passage at the front end of the identification flow passage outlet 1103. It should be noted that although the identification flow passage is depicted as having a specific form and structure in the drawings, the identification flow passage can also have other forms and structures, and the characteristic of the identification flow passage is that the cross-sectional dimension is small and the flow passage length is long.

[0074] A preferred embodiment: the cover plate 2 is a frame-shaped body with the same shape and the same outer circumferential size as the shell 11, and a pressing step is arranged at the lower side of the window inner side, and the cover plate 2 is connected with the shell 11 through the bolt 3. The pressing step arranged at the lower side of the window inner side of the cover plate 2 can firmly fix the flow control mechanism installed in the shell 11 in the shell 11.

[0075] A preferred embodiment: the double-channel adaptive oil well fluid inflow control device is installed outside the oil pipe at the top of the screen pipe, and two or more double-channel adaptive oil well fluid inflow control devices can be installed in the circumferential direction of the oil pipe; the production channel outlet 1102 is communicated with the assembly through hole in the oil pipe wall. The oil well fluid respectively enters the identification channel and the production channel through the window of the cover plate 2 of the device, and then enters the oil pipe.

[0076] The above-described embodiments are only typical embodiments, but the present application is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and concept of the present application. Although the present application is described in detail with reference to the above-described embodiments, those skilled in the art can modify the technical solutions recorded in the above-described embodiments, or make equivalent replacement for part of the technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and concept of the present application should be included in the protection scope of the present application. Therefore, the protection scope is not limited to the above description.

Claims

1. A dual-channel adaptive oil well fluid production inflow control device, comprising a production channel, characterized in that: The flow control mechanism includes an upper grid plate (7) and a lower grid plate (8) and a flow control switch installed therein. The cover plate (2) fixes the flow control mechanism in the housing (11). The flow control switch includes a movable grid plate (6) and a front pressure-bearing member (4), a front slider (5), and a rear slider (9) installed at the other end. The production flow channel is composed of production fluid flow holes corresponding to the positions in the upper grid plate (7), the movable grid plate (6), and the lower grid plate (8). When the well produces oil, it flows in from the window of the cover plate (2) and flows out from the production flow channel outlet (1102) in the housing (11). Another identification flow channel is set in the front chute (1), the lower grid plate (8), and the rear chute (10) and is assembled with the housing (11). The pressure balance holes 1 (101) and 2 (1101) in the front slid (1) and the shell (11) correspond to each other and are connected to the sliding chamber and oil pipe in the front slid (1); the pressure inlet hole (1001) in the rear slid (10) is connected to its sliding chamber and the identification flow channel; the oil well production fluid enters the identification flow channel from the inlet in the identification flow channel in the shell (11) and flows out from the outlet (1103) in the identification flow channel in the shell (11); the flow control switch can slide in the sliding chamber in the front slid (1) and the rear slid (10) according to the top thrust force on the front pressure member (4) and the front slider (5) and the counter thrust force on the rear slider (9), and automatically open or close the production flow channel.

2. The dual-channel adaptive oil well fluid production inflow control device as described in claim 1, characterized in that, The sliding chamber in the front sliding part (1) is a U-shaped groove with its right end connected to the body of the front sliding part (1) and its left end connected to the center hole of the front sliding part (1). One end of the front pressure member (4) is connected to the front slider (5) installed at one end of the movable grid plate (6) and the other end is installed in the center hole of the front sliding part (1). When the movable grid plate (6) moves to the left, the front pressure member (4) and the front slider (5) fixed together with the movable grid plate (6) can move in the sliding chamber of the front sliding part (1). The pressure balance hole one (101) and pressure balance hole two (1101) correspondingly provided in the front sliding part (1) and the housing (11) are connected to the bottom left side of the sliding chamber in the front sliding part (1).

3. The dual-channel adaptive oil well fluid inflow control device as described in claim 2, characterized in that, The front pressure member (4) is a non-uniform diameter cylinder with its small outer diameter end installed in the front slider (5). Both ends of the front slider (5) are fixed together with the movable grid plate (6). The large diameter end of the front pressure member (4) can move in the center hole of the front slide groove member (1). The empty height of the sliding chamber in the front slide groove member (1) is greater than the thickness of the front pressure member (4) and the front slider (5).

4. The dual-channel adaptive oil well fluid inflow control device as described in claim 3, characterized in that, The inner cavity of the rear slide groove (10) is a non-uniform width through cavity with a sliding limit step and located on one side of the rear slider (9). The width of the through cavity is a sliding chamber. The width of the sliding chamber is greater than the width of the rear slider (9) installed at one end of the movable grid plate (6). The movable grid plate (6) can drive the rear slider (9) to move in the sliding chamber of the rear slide groove (10).

5. The dual-channel adaptive oil well fluid inflow control device as described in claim 4, characterized in that, The cavity formed by the sliding limiting step on the right side of the rear slide member (10) and the housing (11) is a pressure introduction chamber (1003). The pressure introduction hole (1001) is located in the lower body of the pressure introduction chamber (1003) and communicates with the identification flow channel located in the rear slide member (10).

6. The dual-channel adaptive oil well fluid inflow control device as described in claim 5, characterized in that, The movable grid plate (6), the upper grid plate (7) and the lower grid plate (8) are all plate-shaped bodies, and the corresponding liquid flow channels in the plate-shaped bodies are in the same position and have the same number. The width of the movable grid plate (6) is smaller than the width of the upper grid plate (7) and the lower grid plate (8), and the length is greater than the length of the upper grid plate (7) and the lower grid plate (8). The width of the liquid flow channel in the movable grid plate (6) is smaller than the width of the liquid flow channel in the upper grid plate (7) and the lower grid plate (8).

7. The dual-channel adaptive oil well fluid inflow control device as described in claim 6, characterized in that, The upper grid plate (7) and the lower grid plate (8) are provided with protrusions on both sides of their corresponding surfaces. The sum of the heights of the protrusions on both sides of the upper grid plate (7) and the lower grid plate (8) is greater than the thickness of the movable grid plate (6), and the width between the protrusions on both sides is greater than the width of the movable grid plate (6).

8. The dual-channel adaptive oil well fluid inflow control device as described in claim 7, characterized in that, The housing (11) is a non-uniformly wide through frame. The narrow groove formed on the left side of the frame is the identification channel inlet groove (1104). The through groove in the center of the bottom plate of the housing (11) is the production channel outlet (1102). The width of the production channel outlet (1102) is greater than the width of the liquid flow holes distributed in the upper grid plate (7) and the lower grid plate (8). The width of the upper grid plate (7) and the lower grid plate (8) matches the width of the front slide (1) and the rear slide (10).

9. The dual-channel adaptive oil well fluid inflow control device as described in claim 8, characterized in that, The identification channel is formed by the flow channel 1 (102) in the front slide (1), the flow channel 2 (801) in the lower grid plate (8), the flow channel 3 (1002) in the rear slide (10) and the bottom surface of the shell (11); the cross-sectional area of ​​the identification channel formed by the combination is less than 1 square centimeter, and the ratio of the length of the identification channel to the minimum cross-sectional size is greater than 50; the identification channel inlet groove (1104) is set on the left side of the shell (11) as the identification channel inlet and communicates with the identification channel, and the pressure inlet hole (1001) is at the front end of the identification channel outlet (1103) and communicates with the identification channel.

10. The dual-channel adaptive oil well fluid inflow control device as described in claim 9, characterized in that, The cover plate (2) is a frame-shaped body with the same shape and outer dimensions as the shell (11), and a pressing step is provided on the lower inner edge of the window. The cover plate (2) is connected to the shell (11) by bolts (3).

11. The dual-channel adaptive oil well fluid production inflow control device as described in claim 10, characterized in that, The dual-channel adaptive oil well fluid inflow control device is installed outside the oil pipe at the top of the screen pipe. More than two dual-channel adaptive oil well fluid inflow control devices can be installed in the circumference of the oil pipe. The production channel outlet (1102) is connected to the assembly through hole in the oil pipe wall.

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