Tesla valve type gas well downhole flow control device

Abstract

The invention discloses a Tesla valve type gas well downhole flow control device, and relates to a fluid control technology for achieving water control and yield increase in the gas field development process. The technical problems that in the prior art, fluid fluidity of gas and water in a Tesla valve type flow channel is poor, the gas-water two-phase separation effect is poor, and the gas well water invasion inhibition effect is poor are solved. The Tesla valve type underground flow control valve comprises a Tesla valve type underground flow control valve cover and a Tesla valve type underground flow control valve body, a first inlet of the Tesla valve type underground flow control valve body, a phase state sorting cavity, a tail Tesla valve type flow channel, a lateral Tesla valve type flow channel, an O-shaped cavity and an outlet are communicated; the flow channel width of the first inlet, the flow channel width of the tail Tesla valve type flow channel and the flow channel width of the lateral Tesla valve type flow channel are all smaller than the flow channel width of the phase state sorting cavity, and the tail end of the phase state sorting cavity communicates with the tail Tesla valve type flow channel through a reducing structure. According to the control device, the separation efficiency of gas-water two-phase fluid can be effectively enhanced, and higher flow resistance is generated on a water phase, so that water invasion is inhibited.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas field development, and relates to a fluid control technology for achieving water control and production increase during gas field development, and in particular to a Tesla valve type gas well downhole flow control device. Background Art

[0002] During gas reservoir development, the probability of water intrusion increases significantly with the extension of production time and the continuous decrease in reservoir pressure. This water intrusion not only causes a sharp drop in gas well productivity and a significant reduction in recovery rate, but also the reservoir damage it causes is often difficult to recover and may even be irreversible. It is worth noting that in heterogeneous reservoirs, due to the presence of high permeability layers or fracture-developed areas, water intrusion usually preferentially advances through these dominant channels, resulting in a serious imbalance in the production profile between high and low permeability layers. However, existing traditional drainage gas production technology has obvious limitations in dealing with this problem. On the one hand, it cannot implement precise treatment of specific water-producing layers or water-producing sections and can only perform drainage operations on the entire wellbore. On the other hand, this method cannot effectively prevent the negative impact of water-producing layers on other gas-producing layers, resulting in a significant reduction in the treatment effect. The invention with application number CN202410312751.0 discloses a control device suitable for segmented water control and gas production in gas wells, which includes: a water control and gas production control device, including a bearing base pipe, a fixed installation groove, a Tesla valve water controller, an air-flowing drag reduction groove, and a bearing base pipe flow outlet; the Tesla valve water controller includes a Tesla valve water controller flow channel bearing body, a Tesla valve water controller flow channel bearing body flow inlet, a Tesla valve water controller flow channel bearing body flow channel, a Tesla valve water controller flow channel bearing body flow outlet, and a Tesla valve water controller outer packaging body; the bearing base pipe is a hollow pipe with a certain thickness, and a fixed installation groove is provided on the outer surface of the bearing base pipe, the groove surface of the fixed installation groove is flat, and a bearing base pipe flow outlet is provided, wherein the fixed installation groove is used to fix the Tesla valve water controller, and an air-flowing drag reduction groove is provided at a position in contact with one side of the fixed installation groove.

[0003] In this control device, when only gas flows through the water control and gas production control device, the flow resistance generated by the gas in the flow channel of the Tesla valve-type water control flow channel carrier is very small. When a small amount of water begins to appear in the formation, a two-phase fluid of gas and water enters the flow channel of the Tesla valve-type water control flow channel carrier. Because the flow channel of the Tesla valve-type water control flow channel carrier has the characteristic of the Tesla valve, which can produce gas-water mixing within the flow channel, the small amount of water mixes with the gas within the flow channel of the Tesla valve-type water control flow channel carrier and is carried out by the airflow, ultimately being carried out of the surface. Because the flow channel of the Tesla valve-type water control flow channel carrier has the characteristic of the Tesla valve that the reverse flow resistance is greater than the forward flow resistance, and the flow resistance generated by water within the flow channel is much greater than the resistance generated by gas, the greater the water production, the higher the resistance value. Therefore, when a large amount of water appears in the formation, the high flow resistance generated by the water in the flow channel of the Tesla valve-type water control flow channel carrier makes it more difficult for water to pass through, resulting in less water entering the oil pipeline, while other unaffected gas-producing layers can continue production.

[0004] This control device can effectively block the water-producing layer in the gas well, prevent water from entering the wellbore, greatly delay the time it takes for the gas well to see water, and ensure the normal production of gas in other producing layers with minimal obstruction, making a significant contribution to increasing the gas production and recovery rate of the entire gas well.

[0005] This control device features a Tesla valve-type water control flow channel carrier body with a flow inlet for gas and water to enter. Furthermore, a Tesla valve-type water control flow channel carrier body flow outlet is provided directly after the Tesla valve-type water control flow channel carrier body flow inlet, flow channel, and flow outlet. Because the Tesla valve-type water control flow channel carrier body flow inlet, flow channel, and flow outlet all have identical inner diameters, once gas and water enter the Tesla valve-type water control flow channel carrier body, fluid flow stability is poor, resulting in limited gas-water phase separation and poor suppression of water intrusion in gas wells. Summary of the Invention

[0006] The purpose of the present invention is to provide a Tesla valve type gas well downhole flow control device in order to solve the technical problems in the prior art of poor fluid fluidity of gas and water in Tesla valve type flow channels, poor gas-water two-phase separation effect, and poor gas well water intrusion suppression effect.

[0007] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: A Tesla valve type gas well downhole flow control device, comprising a Tesla valve type downhole flow control valve cover and a Tesla valve type downhole flow control valve body; The Tesla valve type downhole flow control valve body is provided with a first inlet on the side surface and an outlet on the bottom surface. The Tesla valve type downhole flow control valve body is provided with a phase separation cavity, a tail Tesla valve type flow channel, a lateral Tesla valve type flow channel, and an O-type cavity. The first inlet is connected to the front end of the phase separation chamber, the side of the phase separation chamber is connected to the lateral Tesla valve type flow channel, the tail end of the phase separation chamber is connected to the tail Tesla valve type flow channel, and the tail Tesla valve type flow channel and the other end of the lateral Tesla valve type flow channel merge and then connect to the outlet through the O-type cavity; The flow channel widths of the first inlet, the tail Tesla valve type flow channel, and the lateral Tesla valve type flow channel are all smaller than the flow channel width of the phase separation cavity, and the tail end of the phase separation cavity is connected to the tail Tesla valve type flow channel through a reducing structure.

[0008] Furthermore, the tail Tesla valve type flow channel and the lateral Tesla valve type flow channel both include a converging flow channel, and parallel straight flow channels and curved flow channels divided by Tesla valve type diversion guide vanes. The straight flow channel is the Tesla valve type reverse side flow channel, and the curved flow channel is the Tesla valve type reverse straight flow channel and the Tesla valve type curved flow channel arranged in sequence. The head end of the Tesla valve type reverse side flow channel and the head end of the Tesla valve type reverse straight flow channel are both connected to the tail end of the phase separation cavity, and the tail end of the Tesla valve type reverse side flow channel and the tail end of the Tesla valve type curved flow channel are both connected to the converging flow channel.

[0009] Furthermore, a second inlet is provided on the side of the Tesla valve-type downhole flow control valve body, there are two phase separation cavities, and two groups of tail Tesla valve-type flow channels and lateral Tesla valve-type flow channels are provided; the first inlet and the second inlet, the two phase separation cavities, the first group of tail Tesla valve-type flow channels and the second group of tail Tesla valve-type flow channels, the first group of lateral Tesla valve-type flow channels and the second group of lateral Tesla valve-type flow channels are all symmetrical about the axis of the O-type cavity; The first group of tail Tesla valve type flow channels and lateral Tesla valve type flow channels are connected to the first inlet through one of the phase separation cavities, and the second group of tail Tesla valve type flow channels and lateral Tesla valve type flow channels are connected to the second inlet through another phase separation cavity. The other ends of the two groups of tail Tesla valve type flow channels and lateral Tesla valve type flow channels are connected to the O-type cavity.

[0010] Furthermore, the converging flow channel of the first group of rear Tesla valve type flow channels is collinear with the converging flow channel of the second group of lateral Tesla valve type flow channels and is tangent to the O-shaped cavity; The converging flow passages of the second group of tail Tesla valve type flow passages are collinear with the converging flow passages of the first group of lateral Tesla valve type flow passages and are tangent to the O-shaped cavity.

[0011] Furthermore, the first inlet, the phase separation cavity, and the Tesla valve type reverse direct current channel are collinear.

[0012] Furthermore, the angle α at the diversion point of the Tesla valve type diverter guide vane of the tail Tesla valve type flow channel and the angle β at the diversion point of the Tesla valve type diverter guide vane of the lateral Tesla valve type flow channel are both 35° to 60°, and the angle α≠angle β.

[0013] The beneficial effects of the present invention are as follows: 1. In the present invention, by providing a Tesla valve-type flow channel within the valve body, the separation efficiency of gas-water two-phase fluid can be effectively enhanced. By providing Tesla valve-type flow channels at the tail and side of the phase separation chamber, due to the higher viscosity and density of the water phase and the inertia, more water will enter the tail Tesla valve-type flow channel along the current path. Under the action of its special flow channel, the flow resistance of the water can be greatly increased. Because the flow channel width of the phase separation chamber is greater than the width of the front and rear flow channels, this special structure of the phase separation chamber can make gas with relatively lower viscosity and density more easily deflected, causing more gas to enter the lateral Tesla valve-type flow channel and less gas to enter the tail Tesla valve-type flow channel. In the same Tesla valve-type flow channel, due to its lower viscosity and density, the gas will tend to flow along the reverse Tesla valve-type flow channel, and its flow resistance will be reduced. Through the above structure, the control device can effectively enhance the separation efficiency of gas-water two-phase fluid, generate higher flow resistance for the water phase, thereby suppressing water intrusion, achieving better water intrusion suppression effect in gas wells, and improving gas well production performance.

[0014] 2. In the present invention, multiple reverse bends, direct currents and flow measurement channels are set in the Tesla valve-type flow channel. The inertial effect and turbulent characteristics of the fluid are utilized to enhance the smoothness of the fluid in the forward flow, while significant pressure difference and resistance are generated in the reverse flow, thereby realizing unidirectional flow control and achieving effective separation of gas-water two-phase fluids.

[0015] 3. In the present invention, the size and angle of the diverter guide vanes in the Tesla valve-type flow channel can be adjusted to flexibly adapt to different gas well working conditions, thereby improving the applicability of the device.

[0016] 4. In the present invention, the circular structure of the O-type cavity is tangent to the four converging flow channels, which can ensure uniform distribution and efficient discharge of the fluid at the outlet, thereby improving the separation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a schematic diagram of the three-dimensional structure of a Tesla valve type downhole flow control valve according to the present invention; FIG2 is a cross-sectional view of a Tesla valve type downhole flow control valve according to the present invention; FIG3 is a schematic diagram of the working principle of the downhole flow control device of the present invention; Figure 4 Schematic diagram of the angle of the Tesla valve type diverter guide vane at the diverter position in the present invention; Wherein, the accompanying drawings are marked as follows: 01-Tesla valve type gas well downhole flow control device, 100-Tesla valve type downhole flow control valve cover, 200-Tesla valve type downhole flow control valve body, 201-first inlet, 202-phase separation cavity, 203-O-type cavity, 204-outlet, 205-second inlet, 206-carrier, 207-carrier base pipe, 2010-tail Tesla valve type flow channel, 2020-lateral Tesla valve type flow channel, 2011-Tesla valve type reverse straight flow channel, 2012-Tesla valve type curved flow channel, 2013-Tesla valve type reverse lateral flow channel, 2014-Tesla valve type diversion guide vane, 2015-convergent flow channel. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0019] Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0020] Example 1 This embodiment provides a Tesla valve type gas well downhole flow control device, which is used for water drainage and gas production in gas wells and can effectively suppress water intrusion during the gas production process.

[0021] like Figure 1 As shown, the control device includes a Tesla valve-type downhole flow control valve cover 100 and a Tesla valve-type downhole flow control valve body 200. The Tesla valve-type downhole flow control valve cover 100 has an open bottom. The Tesla valve-type downhole flow control valve cover 100 covers the Tesla valve-type downhole flow control valve body 200, and its periphery is in close contact with the periphery of the Tesla valve-type downhole flow control valve body 200. The Tesla valve-type downhole flow control valve body 200 has a first inlet 201 on the side, a flow channel for gas and water two-phase fluid circulation inside, and an outlet 204 at the bottom. The first inlet 201, the flow channel, and the outlet 204 are sequentially connected. When the Tesla valve-type downhole flow control valve cover 100 covers the Tesla valve-type downhole flow control valve body 200, the first inlet 201, the flow channel, and the outlet 204 form a circumferentially closed flow channel with two ends open.

[0022] The flow channels in the Tesla valve-type downhole flow control valve body 200 include a phase separation chamber 202, a tail Tesla valve-type flow channel 2010, a lateral Tesla valve-type flow channel 2020, and an O-type cavity 203, all of which are arranged in the Tesla valve-type downhole flow control valve body 200; the first inlet 201 is connected to the head end of the phase separation chamber 202, and the tail end and side of the phase separation chamber 202 are both provided with openings. The phase separation chamber 202 is connected to the tail Tesla valve-type flow channel 2010 through the opening at its tail end, and the phase separation chamber 202 is connected to the lateral Tesla valve-type flow channel 2020 through the opening on its side. The tail Tesla valve-type flow channel 2010 and the lateral Tesla valve-type flow channel 2020 are connected to the outlet 204 through the O-type cavity 203 after merging at the other end. The Tesla valve type downhole flow control valve cover 100 and the phase separation cavity 202 are connected by interference fit using a thermal assembly method, making the device easier and more reliable during installation and maintenance.

[0023] The flow channel width of the phase separation chamber 202 is greater than the flow channel width of the first inlet 201, the tail Tesla valve type flow channel 2010, and the lateral Tesla valve type flow channel 2020; the tail end of the phase separation chamber 202 is set as a reducing structure, the flow channel width of the reducing structure close to the side of the phase separation chamber 202 is larger, and the flow channel width of the reducing structure close to the side of the tail Tesla valve type flow channel 2010 is smaller; the lateral Tesla valve type flow channel 2020 is installed obliquely on the phase separation chamber 202, and there is an angle γ between the water inlet direction of the lateral Tesla valve type flow channel 202 and the axis of the phase separation chamber 202.

[0024] like Figure 3 As shown, if no measures are taken to control water during production at the wellbore location corresponding to the high permeability area of ​​the gas well, there is a high probability that non-uniform water infiltration will occur in this area, resulting in premature breakthrough. When a large amount of water from the wellbore flows into the wellbore, there will be a risk of water production. In this case, the Tesla valve-type gas well downhole flow control device 01 of this embodiment can be installed on a carrier base pipe 207 on a carrier body 206, and then the carrier body 206 equipped with the Tesla valve-type gas well downhole flow control device 01 is connected to the tubing string of the wellbore. When the water and gas generated downhole enter the device through the first inlet 201 of the Tesla valve-type gas well downhole flow control device 01 installed on the carrier body 206, the water and gas will be separated within the device.

[0025] The working process (principle) of the device is: When the fluid produced by a certain reservoir is single-phase water, the water enters the phase separation chamber 202 through the first inlet 201; due to the relatively large viscosity and density of water, under the action of inertia, more water will enter the tail Tesla valve type flow channel 2010 along the current path, while a small amount of water will enter the lateral Tesla valve type flow channel 2020 from the side of the phase separation chamber 202; after the water enters the tail Tesla valve type flow channel 2010 and the lateral Tesla valve type flow channel 2020, the water is further diverted under the action of the Tesla valve structure inside them, and the curved flow channel in the Tesla valve structure greatly increases the flow resistance of the water; the water flowing out of the tail Tesla valve type flow channel 2010 and the lateral Tesla valve type flow channel 2020 converges and enters the O-type cavity 203, and is finally discharged through the outlet 204. During this process, the phase separation chamber 202 performs primary diversion, and the tail Tesla valve-type flow channel 2010 and the lateral Tesla valve-type flow channel 2020 perform secondary diversion. The water flow resistance is large, which can enhance the flow resistance of the water phase, thereby suppressing water intrusion. When a single-phase gas is produced from a reservoir, the gas enters the phase separation chamber 202 through the first inlet 201. Due to the asymmetrically arranged outlets on the phase separation chamber 202 and the different widths of the two outlets (the outlet at the tail end has a reduced diameter structure, and the flow path size of the gas when entering the reduced diameter structure from the phase separation chamber 202 is smaller than the flow path size of the gas when entering the lateral Tesla valve type flow channel 2020 from the phase separation chamber 202), this structural feature makes it easier for the gas with relatively smaller viscosity and density to be deflected, so that more gas enters the lateral Tesla valve type flow channel 2020. The gas flows into the Tesla valve-type flow channel 220, while a small amount enters the rear Tesla valve-type flow channel 2010. After entering the rear Tesla valve-type flow channel 2010 and the lateral Tesla valve-type flow channel 2020, the gas is further diverted by the Tesla valve-type diverter guide vanes 214 and the Tesla valve flow channel structure. (Due to the low viscosity and density of the gas, it tends to flow along the Tesla valve-type reverse flow channel 2013 of the corresponding flow channel (i.e., the rear Tesla valve-type flow channel 2010 and the lateral Tesla valve-type flow channel 2020). Therefore, most of the gas will enter the Tesla valve-type reverse flow channel 2013, while a small amount of gas will enter the Tesla valve-type reverse straight flow channel 2011 and the Tesla valve-type curved flow channel 2012, achieving diversion.) The gas flowing out of the rear Tesla valve-type flow channel 2010 and the lateral Tesla valve-type flow channel 2020 converges and enters the O-type cavity 203, and is finally discharged through the outlet 204. When the fluid produced by a certain reservoir is two-phase gas and water, the gas and water enter the phase separation chamber 202 through the first inlet 201; due to the structural characteristics of the phase separation chamber 202, most of the water (of course there will also be a small amount of gas) enters the tail Tesla valve type flow channel 2010, and most of the gas (of course there will also be a small amount of water) enters the lateral Tesla valve type flow channel 2020 (the principle is as analyzed above), the water containing a small amount of gas is further separated in the Tesla valve structure of the tail Tesla valve type flow channel 2010, and the gas containing a small amount of water is further separated in the Tesla valve structure of the lateral Tesla valve type flow channel 2020. The separated gas and water eventually enter the O-type cavity 203 and are finally discharged through the outlet 204 (the outlet 204 discharges layered water and gas, which are collected separately at the wellhead using existing technology). During this process, in the flow channel of the Tesla valve structure according to this embodiment, in the two-phase flow state, the gas and water will still use their own characteristics and features to divert the gas and water, effectively distinguish the gas and water, and produce greater flow resistance to the water, thereby limiting the entry of water into the wellbore, suppressing water intrusion, and improving the effect of suppressing water intrusion in gas wells, thereby better solving the technical problems of this application and improving the technical effects of this application.

[0026] Example 2 In this embodiment, a specific structure of a rear Tesla valve type flow channel 2010 and a lateral Tesla valve type flow channel 2020 is provided.

[0027] like Figure 2 As shown, the tail Tesla valve type flow channel 2010 and the lateral Tesla valve type flow channel 2020 have the same structure, both including a Tesla valve structure. Specifically: The tail Tesla valve-type flow channel 2010 and the lateral Tesla valve-type flow channel 2020 each include a straight flow channel, a curved flow channel, and a converging flow channel 2015. The straight flow channel and the curved flow channel are arranged in parallel and separated by a Tesla valve-type diverter guide vane 2014. The straight flow channel is the Tesla valve-type reverse side flow channel 2013, and the curved flow channel includes a Tesla valve-type reverse straight flow channel 2011 and a Tesla valve-type curved flow channel 2012, which are arranged in sequence and connected. The length of the straight flow channel is shorter than that of the curved flow channel. The beginning of the Tesla valve type reverse side flow channel 2013 and the beginning of the Tesla valve type reverse straight flow channel 2011 are both connected to the phase separation chamber 202 (the Tesla valve type reverse side flow channel 2013 and the Tesla valve type reverse straight flow channel 2011 of the tail Tesla valve type flow channel 2010 are connected to the small-diameter end of the reduced diameter structure of the phase separation chamber 202), and the tail end of the Tesla valve type reverse side flow channel 2013 and the tail end of the Tesla valve type curved flow channel 2012 are both connected to the converging flow channel 2015.

[0028] During operation, when the fluid produced by a certain reservoir is single-phase water, the water enters the tail Tesla valve type flow channel 2010 (most of the water enters) and the lateral Tesla valve type flow channel 2020 (a small amount of water enters), and is further diverted under the action of the Tesla valve type diversion guide vane 2014. Most of the water continues to move forward to the Tesla valve type reverse straight channel 2011 and turns in the Tesla valve type curved flow channel 212, greatly increasing the flow resistance of the water. A small amount of water is diverted to the Tesla valve type reverse side flow channel 2013, and finally flows back at the confluence flow channel 2015 and enters the O-type cavity 203 along the confluence flow channel 2015, and is finally discharged through the outlet 204. When the fluid produced from a certain reservoir is single-phase gas, the gas enters the lateral Tesla valve flow channel 2020 (most of the gas enters) and the tail Tesla valve flow channel 2010 (a small amount of gas enters), and is further diverted by the Tesla valve diversion guide vane 2014. Most of the gas enters the Tesla valve reverse lateral flow channel 2013, while a small amount of gas enters the Tesla valve reverse straight flow channel 2011 and the Tesla valve curved flow channel 2012. Finally, the gas refluxes at the converging flow channel 2015 and enters the O-type cavity 203 along the converging flow channel 2015, and is finally discharged through the outlet 204. When the fluid produced by a certain reservoir is two-phase gas and water, the gas and water enter the lateral Tesla valve type flow channel 2020 (mostly gas and a small amount of water) and the tail Tesla valve type flow channel 2010 (mostly water and a small amount of gas), and are further diverted under the action of the Tesla valve type diversion guide vane 2014. Most of the water continues to move forward to the Tesla valve type reverse straight channel 2011 and turns in the Tesla valve type curved flow channel 2012, greatly increasing the flow resistance of the water. Most of the gas is diverted to the Tesla valve type reverse side flow channel 2013, and finally enters the O-type cavity 203 in layers through the converging flow channel 2015, and is finally discharged through the outlet 204.

[0029] Example 3 In this embodiment, two inlets and one outlet are provided on the Tesla valve type downhole flow control valve body 200 .

[0030] like Figure 1 、 Figure 2As shown, a Tesla valve-type downhole flow control valve body 200 has a first inlet 201 and a second inlet 205 formed on its side. The first inlet 201 and the second inlet 205 are symmetrically arranged about the axis of the O-shaped cavity 203 on the Tesla valve-type downhole flow control valve body 200. Similarly, two sets of phase separation cavities 202 are provided, also symmetrically arranged about the axis of the O-shaped cavity 203. The first inlet 201 communicates with one of the phase separation cavities 202, and the second inlet 205 communicates with the other phase separation cavity 202. The Tesla valve-type downhole flow control valve body 200 also has two sets of tail Tesla valve-type flow channels 2010 and two sets of lateral Tesla valve-type flow channels 2020. The two sets of tail Tesla valve-type flow channels 2010 and the two sets of lateral Tesla valve-type flow channels 2020 are symmetrically arranged about the axis of the O-shaped cavity 203 on the Tesla valve-type downhole flow control valve body 200.

[0031] Among them, the first group of tail Tesla valve type flow channels 2010 and the head ends of the lateral Tesla valve type flow channels 2020 are connected to the first inlet 201 through one of the phase separation cavities 202, and the second group of tail Tesla valve type flow channels 2010 and the head ends of the lateral Tesla valve type flow channels 2020 are connected to the second inlet 205 through another phase separation cavity 202, and the other ends (tail ends) of the two groups of tail Tesla valve type flow channels 2010 and the lateral Tesla valve type flow channels 2020 are connected to the O-type cavity 203.

[0032] Preferably, the converging flow channel 2015 of the first group of tail Tesla valve type flow channels 2010 is collinear with the converging flow channel 2015 of the second group of lateral Tesla valve type flow channels 2020, and is tangent to the O-type cavity 203; the converging flow channel 2015 of the second group of tail Tesla valve type flow channels 2010 is collinear with the converging flow channel 2015 of the first group of lateral Tesla valve type flow channels 2020, and is tangent to the O-type cavity 203.

[0033] Preferably, the first inlet 201, the corresponding phase separation cavity 202, and the Tesla valve type reverse straight flow channel 2011 are collinear. Similarly, the second inlet 205, the corresponding phase separation cavity 202, and the Tesla valve type reverse straight flow channel 2011 are also collinear.

[0034] Since the four converging flow channels 2015 are collinear in pairs, and the diversion flow of the two collinear converging flow channels 2015 presents a "large-small" complementary advantage, the water diversion effect can be enhanced; at the same time, the water entering the O-type cavity 203 can produce a more sufficient swirl effect, and generate greater flow resistance when passing through the outlet 204.

[0035] Example 4 In this embodiment, the angle α at the diversion point of the Tesla valve-type diverter guide vane 2014 of the tail Tesla valve-type flow channel 2010 and the angle β at the diversion point of the Tesla valve-type diverter guide vane 2014 of the lateral Tesla valve-type flow channel 2020 are both 35° to 60°, and the angle α≠ the angle β. Figure 4 shown.

[0036] Because the phase separation chamber 202 achieves a preliminary flow separation and phase separation, the gas and water entering the rear Tesla valve-type flow channel 2010 and the lateral Tesla valve-type flow channel 2020 experience flow differences, and further flow into the lateral Tesla valve-type flow channel 2020 or the lateral Tesla valve-type flow channel 2020. Because the angle α is ≠ the angle β, the Tesla valve-type diverter guide vane 214 can achieve secondary flow diversion between different flow channels, thereby enhancing the diversion control effect in high-water flow channels. For example, when the gas flow rate entering the lateral Tesla valve-type flow channel 2020 is higher, the angle α is greater than the angle β, causing more water entering the rear Tesla valve-type flow channel 2010 to flow into the Tesla valve-type curved flow channel 212, significantly increasing the water flow resistance. However, due to the smaller angle α, the gas entering the lateral Tesla valve-type flow channel 2020 has a relatively weaker diversion effect, and is more likely to enter the Tesla valve-type reverse side flow channel 2013, where the flow resistance is relatively reduced.

Claims

1. A Tesla valve type gas well downhole flow control device, characterized by: It includes a Tesla valve type downhole flow control valve cover (100) and a Tesla valve type downhole flow control valve body (200); The Tesla valve type downhole flow control valve body (200) is provided with a first inlet (201) on the side surface and an outlet (204) on the bottom surface. The Tesla valve type downhole flow control valve body (200) is provided with a phase separation cavity (202), a tail Tesla valve type flow channel (2010), a lateral Tesla valve type flow channel (2020), and an O-type cavity (203) inside. The first inlet (201) is connected to the front end of the phase separation chamber (202), the side of the phase separation chamber (202) is connected to the lateral Tesla valve type flow channel (2020), the rear end of the phase separation chamber (202) is connected to the rear Tesla valve type flow channel (2010), and the rear Tesla valve type flow channel (2010) and the other end of the lateral Tesla valve type flow channel (2020) are connected to the outlet (204) through the O-type cavity (203); The flow channel widths of the first inlet (201), the tail Tesla valve type flow channel (2010), and the lateral Tesla valve type flow channel (2020) are all smaller than the flow channel width of the phase separation cavity (202), and the tail end of the phase separation cavity (202) is connected to the tail Tesla valve type flow channel (2010) through a reduced diameter structure.

2. A Tesla valve type gas well downhole flow control device according to claim 1, characterized in that: The tail Tesla valve type flow channel (2010) and the lateral Tesla valve type flow channel (2020) both include a converging flow channel (2015), and parallel straight flow channels and curved flow channels divided by the Tesla valve type diversion guide vane (2014). The straight flow channel is the Tesla valve type reverse side flow channel (2013), and the curved flow channel is the Tesla valve type reverse straight flow channel (2011) and the Tesla valve type curved flow channel (2012) arranged in sequence. The head end of the Tesla valve type reverse side flow channel (2013) and the head end of the Tesla valve type reverse straight flow channel (2011) are both connected to the phase separation cavity (202), and the tail end of the Tesla valve type reverse side flow channel (2013) and the tail end of the Tesla valve type curved flow channel (2012) are both connected to the converging flow channel (2015).

3. A Tesla valve type gas well downhole flow control device according to claim 1 or 2, characterized in that: A second inlet (205) is further provided on the side of the Tesla valve-type downhole flow control valve body (200), there are two phase separation cavities (202), and two groups of tail Tesla valve-type flow channels (2010) and lateral Tesla valve-type flow channels (2020); the first inlet (201) and the second inlet (205), the two phase separation cavities (202), the first group of tail Tesla valve-type flow channels (2010) and the second group of tail Tesla valve-type flow channels (2010), the first group of lateral Tesla valve-type flow channels (2020) and the second group of lateral Tesla valve-type flow channels (2020) are all symmetrical about the axis of the O-type cavity (203); The first group of tail Tesla valve-type flow channels (2010) and lateral Tesla valve-type flow channels (2020) are both connected to the first inlet (201) through one of the phase separation cavities (202), and the second group of tail Tesla valve-type flow channels (2010) and lateral Tesla valve-type flow channels (2020) are both connected to the second inlet (205) through another phase separation cavity (202), and the other ends of the two groups of tail Tesla valve-type flow channels (2010) and lateral Tesla valve-type flow channels (2020) are both connected to the O-type cavity (203).

4. A Tesla valve type gas well downhole flow control device according to claim 3, characterized in that: The converging flow channel (2015) of the first group of rear Tesla valve-type flow channels (2010) and the converging flow channel (2015) of the second group of lateral Tesla valve-type flow channels (2020) are collinear and tangent to the O-shaped cavity (203); The converging flow channel (215) of the second group of rear Tesla valve-type flow channels (2010) is collinear with the converging flow channel (215) of the first group of lateral Tesla valve-type flow channels (2020) and is tangent to the O-type cavity (203).

5. The Tesla valve type gas well downhole flow control device according to claim 2, characterized in that: The first inlet (201), the phase separation cavity (202), and the Tesla valve type reverse direct current channel (2011) are collinear.

6. A Tesla valve type gas well downhole flow control device according to claim 2, characterized in that: The angle α at the diversion point of the Tesla valve type diverter guide vane (2014) of the tail Tesla valve type flow channel (2010) and the angle β at the diversion point of the Tesla valve type diverter guide vane (2014) of the lateral Tesla valve type flow channel (2020) are both 35° to 60°, and the angle α≠ the angle β.

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