Rotary automatic flow distribution device in geothermal well for oil well transformation

Abstract

The invention relates to the technical field of geothermal energy development and utilization, in particular to a rotary type automatic flow distribution device in a geothermal well for oil well transformation, which is characterized in that a flow adjusting ring is sleeved outside an adjusting inner ring, and the adjusting inner ring is connected to a heat taking core pipe; an inner ring hole is formed in the adjusting inner ring, and an outer ring hole is formed in the flow adjusting ring. The flow adjusting ring is connected with a driving mechanism used for driving the flow adjusting ring to rotate through the impulsive force of fluid with the flow when the flow of the fluid in the sleeve is larger than the preset flow. The limiting mechanism is connected with the flow adjusting ring and the adjusting inner ring and used for limiting the flow adjusting ring to rotate to the maximum limit and driving the flow adjusting ring to rotate to the initial position. The problems that when an existing oil well is transformed into a geothermal well, the pipe diameter in an oil pipe and the pipe diameter of a heat taking core pipe are decreased due to the fact that a perforation section is blocked in a downward oil pipe hanging mode, the expected flow of fluid is difficult to achieve when pump energy consumption is improved, and the heat recovery capacity of the geothermal well cannot be further improved are solved.

Description

Technical Field

[0001] The invention relates to the technical field of geothermal energy development and utilization, and in particular to a rotary flow automatic distribution device in a geothermal well for oil well transformation. Background Art

[0002] In the process of transforming oil wells into geothermal wells, in order to achieve heat extraction below the perforation section, the perforation section in the casing is blocked by hanging the oil pipe under the packer to prevent crude oil and sewage in the formation from seeping into the heat extraction well through the perforation holes on the casing. After hanging the oil pipe in the casing, the well section below the packer is restricted by the packer and the oil pipe, the well diameter becomes smaller, and the fluid flow that can pass through the oil pipe is relatively small. Correspondingly, the diameter of the heat extraction core pipe inside the oil pipe also becomes smaller. When the flow rate of the fluid in the casing of the geothermal well increases to a certain amount, the resistance along the way also increases exponentially. That is, when the flow rate increases to a certain extent, increasing the pump energy consumption cannot achieve the expected flow rate and cannot meet the heat extraction demand. Summary of the invention

[0003] The present invention proposes a rotary flow automatic distribution device in a geothermal well for oil well transformation, so as to solve the problem that in the existing oil well transformation into a geothermal well, the diameter of the oil pipe and the heat extraction core pipe becomes smaller due to the plugging of the perforation section by hanging the oil pipe, and the energy consumption of the pump is increased but it is difficult to achieve the expected flow rate of the fluid, and the heat extraction of the geothermal well cannot be further increased.

[0004] According to one aspect of the present invention, there is provided a rotary flow automatic distribution device in a geothermal well for oil well transformation, comprising: a driving mechanism, a flow regulating ring, an regulating inner ring and a limiting mechanism;

[0005] The flow regulating ring is sleeved on the outside of the regulating inner ring, and the regulating inner ring is connected to the heat extracting core tube;

[0006] The inner adjustment ring is provided with an inner ring hole, the flow adjustment ring is provided with an outer ring hole, and when the flow adjustment ring is in the initial position, the positions of the inner ring hole and the outer ring hole are staggered;

[0007] The flow regulating ring is connected to the driving mechanism for driving the ring to rotate by the impulse of the fluid at a flow rate when the flow rate of the fluid in the casing is greater than a predetermined flow rate;

[0008] The limiting mechanism is connected to the flow regulating ring and the regulating inner ring respectively, and is used to limit the flow regulating ring to rotate to the maximum limit when the inner ring hole overlaps with the outer ring hole, and to drive the flow regulating ring to rotate to the initial position when the fluid flow in the casing is less than the predetermined value.

[0009] Preferably, the limiting mechanism comprises: a limiting ring and a spring;

[0010] The limiting ring is sleeved outside the adjusting inner ring and is located above the flow adjusting ring;

[0011] A limiting groove is arranged on the side wall of the limiting ring near the bottom, and a protrusion is arranged on the top of the flow regulating ring, and the protrusion is inserted into the limiting groove. When the protrusion contacts one side of the limiting groove, the flow regulating ring is in an initial position, and when the protrusion contacts the other side of the limiting groove, the flow regulating ring rotates to the maximum limit position;

[0012] The spring is located between the limiting ring and the adjusting inner ring, one end of the spring is connected to the limiting ring, and the other end is connected to the flow adjusting ring, and the position of the spring is close to one side of the limiting groove.

[0013] Preferably, the driving mechanism comprises: a blade;

[0014] Mounting grooves are evenly arranged on the side wall of the flow regulating ring near the bottom, and the blades are fixed in the mounting grooves.

[0015] Preferably, the method for determining the number of blades or spring parameters that can drive the flow regulating ring to rotate when the fluid flow in the casing is greater than a predetermined flow includes:

[0016] Obtaining the area of ​​a single blade, the blade installation angle, and the minimum tension that causes the spring to deform;

[0017] Determine the force bearing area of ​​a single blade according to the area and installation angle of the blade;

[0018] Determining the impact force on the single blade according to the predetermined flow rate and the force-bearing area of ​​the single blade;

[0019] The number of blades to be installed or the spring parameters are determined according to the minimum pulling force and the impact force received by a single blade.

[0020] Preferably, determining the impulse force received by a single blade according to a predetermined flow rate and a force receiving area of ​​the single blade comprises:

[0021] Use the formula to determine the impulse force on the blade;

[0022] F=2ρSν 2 (1);

[0023] Where F is the impact force on the blade, ρ is the density of the fluid, v is the flow velocity of the fluid, and S is the force-bearing area of ​​the blade.

[0024] Preferably, it also includes: a righting mechanism;

[0025] The straightening mechanism is connected to the outer side wall of the regulating inner ring and is located below the flow regulating ring. The straightening mechanism is used to limit the distance between the outer side wall of the regulating inner ring and the inner wall of the casing to a predetermined distance.

[0026] Preferably, the centralizing mechanism comprises: a plurality of centralizers;

[0027] The plurality of centralizers are evenly distributed along the circumference of the outer wall of the adjusting inner ring, and the main body of the centralizer is a fan-shaped body, and the inwardly concave side thereof is connected to the outer wall of the adjusting inner ring;

[0028] The predetermined distance has a value range of 2 to 3 mm.

[0029] Preferably, it also includes: a ball;

[0030] A ball groove is arranged on the top of the centralizer, a ball is arranged in the ball groove, and the top of the ball contacts the bottom surface of the flow regulating ring.

[0031] The present invention has at least the following beneficial effects:

[0032] The present invention proposes a rotary flow automatic distribution device in a geothermal well for oil well transformation. By setting a flow regulating ring, an regulating inner ring, a driving mechanism and a limiting mechanism for driving the movement of the heat core tube above the oil pipe, when the fluid in the casing above the oil pipe increases, part of the fluid that exceeds the maximum heat exchange fluid holding capacity of the oil pipe and the heat core tube below can directly enter the corresponding core heat pipe, so that the flow through the oil pipe and the heat core tube remains stable. While increasing the pump energy consumption and improving the pump efficiency to increase the flow, the fluid resistance along the way is reduced by automatic diversion to achieve the expected flow, optimize the pump energy consumption, meet the heat extraction demand, improve the heat exchange efficiency and ensure the heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings herein are incorporated into and constitute a part of the specification. These drawings illustrate embodiments consistent with the present invention and, together with the specification, are used to explain the technical solutions of the present invention.

[0034] Figure 1 A schematic diagram showing the structure of a rotary flow automatic distribution device in an oil well reconstruction geothermal well according to an embodiment of the present invention;

[0035] Figure 2 A schematic diagram showing the position of a rotary flow automatic distribution device in an oil well reconstruction geothermal well according to an embodiment of the present invention is shown.

[0036] In the figure, 1-flow regulating ring, 2-adjusting inner ring, 3-inner ring hole, 4-outer ring hole, 5-blade, 6-limiting ring, 7-spring, 8-centralizer, 9-protrusion, 10-limiting groove, 11-casing, 12-packer, 13-heat core tube, 14-oil pipe, 15-perforation, 16-rotary flow automatic distribution device. DETAILED DESCRIPTION

[0037] Various exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0038] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0039] The term "and / or" herein is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B may indicate: A exists alone, A and B exist at the same time, and B exists alone. In addition, the term "at least one" herein indicates any combination of at least two of any one or more of a plurality of. For example, including at least one of A, B, and C may indicate including any one or more elements selected from the set consisting of A, B, and C.

[0040] In addition, in order to better illustrate the present invention, numerous specific details are provided in the following specific embodiments. It should be understood by those skilled in the art that the present invention can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present invention.

[0041] Figure 1 A schematic diagram showing the structure of a rotary flow automatic distribution device in an oil well reconstruction geothermal well according to an embodiment of the present invention; Figure 2 A schematic diagram showing the well position of a rotary flow automatic distribution device in an oil well transformation geothermal well according to an embodiment of the present invention. Figure 1-2 As shown, a rotary flow automatic distribution device in a geothermal well for oil well transformation comprises: a driving mechanism, a flow regulating ring 1, an regulating inner ring 2 and a limiting mechanism;

[0042] The flow regulating ring 1 is sleeved on the outside of the regulating inner ring 2, and the regulating inner ring 2 is connected to the heat extracting core tube 13;

[0043] The adjusting inner ring 2 is provided with an inner ring hole 3, and the flow adjusting ring 1 is provided with an outer ring hole 4. When the flow adjusting ring 1 is in the initial position, the inner ring hole 3 and the outer ring hole 4 are staggered in position;

[0044] The flow regulating ring 1 is connected to the driving mechanism for driving the ring to rotate by the impulse of the fluid at a flow rate when the flow rate of the fluid in the sleeve 11 is greater than a predetermined flow rate;

[0045] The limiting mechanism is connected to the flow regulating ring 1 and the regulating inner ring 2 respectively, and is used to limit the flow regulating ring 1 to rotate to the maximum limit when the inner ring hole 3 overlaps with the outer ring hole 4, and to drive the flow regulating ring 1 to rotate to the initial position when the fluid flow in the sleeve 11 is less than the predetermined value.

[0046] In the embodiment of the present invention, Figure 1 As shown, the flow regulating ring 1, the driving mechanism and the limiting mechanism are installed on the regulating inner ring 2. The top end of the regulating inner ring 2 is connected to the heat extraction core tube 13, and the bottom end is connected to the reduced diameter lower heat extraction core tube 17. The regulating inner ring 2 is located above the packer 12 at the top of the oil pipe 14 and close to the packer 12. The diameter of the lower heat extraction core tube 17 in the oil pipe 14 is smaller than the diameter of the upper heat extraction core tube 13 in the upper casing 11. After the fluid is injected from the wellhead, it flows from the casing 11 into the oil pipe 14 from top to bottom. After the fluid exchanges heat with the geothermal energy inside the casing 11 and the oil pipe 14, it enters the lower heat extraction core tube 17 from the bottom opening and then returns to the ground. In this process, the heat exchange fluid flow rate that can be accommodated in the oil pipe 14 is generally 5 to 6 m 3 / h; when the fluid injected into the casing 11 increases, the pressure of the fluid in the annulus of the casing 11 above the isolation will increase, and the flow rate of the fluid entering the oil pipe 14 will increase; when the fluid flow rate increases to exceed the predetermined flow rate, the driving mechanism starts to drive the flow regulating ring 1 to rotate counterclockwise through the fluid impulse; when the flow regulating ring 1 rotates to the point where its outer ring hole 4 overlaps with the inner ring hole 3 of the regulating inner ring 2, the limiting mechanism limits the flow regulating ring 1 to stop rotating, and the fluid in the casing 11 enters the heat extraction core tube 13 through the outer ring hole 4 on the flow regulating ring 1 and the inner ring hole 3 on the regulating inner ring 2, thereby reducing the fluid pressure in the casing 11 and ensuring that the flow rate of the fluid entering the oil pipe 14 can be within the predetermined flow rate range, thereby achieving the purpose of reasonable distribution of the flow rates of the fluids exchanging heat in the oil pipe 14 and the casing 11 respectively. Among them, the number and diameter of the inner ring holes 3 and the outer ring holes 4 are determined according to the amount of flow to be diverted. For example, two rows are set, with 6 holes in each row. The inner ring holes 3 and the outer ring holes 4 are evenly distributed along the circumference on the side walls of the flow regulating ring 1 and the regulating inner ring 2.

[0047] When the fluid flow in the casing 11 decreases, the fluid pressure in the casing 11 at the flow regulating ring 1 decreases. When the fluid pressure in the casing 11 is less than a predetermined value, the limit mechanism drives the flow regulating ring 1 to rotate clockwise in the opposite direction and return to the initial position. At this time, the inner ring hole 3 and the outer ring hole 4 are respectively blocked by the flow distributor and the side wall of the regulating inner ring 2. The fluid in the casing 11 cannot enter through the inner ring hole 3 and the outer ring hole 4, thereby ensuring that the fluid flow entering the oil pipe 14 is sufficient.

[0048] In the present invention, the limiting mechanism comprises: a limiting ring 6 and a spring 7;

[0049] The limiting ring 6 is sleeved on the outside of the adjusting inner ring 2 and is located above the flow adjusting ring 1;

[0050] A limiting groove 10 is provided on the side wall of the limiting ring 6 near the bottom, and a protrusion 9 is provided on the top of the flow regulating ring 1, and the protrusion 9 is inserted into the limiting groove 10. When the protrusion 9 contacts one side of the limiting groove 10, the flow regulating ring 1 is in an initial position, and when the protrusion 9 contacts the other side of the limiting groove 10, the flow regulating ring 1 rotates to the maximum limit;

[0051] The spring 7 is located between the limiting ring 6 and the adjusting inner ring 2 , one end of the spring 7 is connected to the limiting ring 6 , and the other end is connected to the flow adjusting ring 1 . The spring 7 is located close to one side of the limiting groove 10 .

[0052] In the embodiment of the present invention, one end of the spring 7 is connected to the limit ring 6, and the other end is connected to the flow regulating ring 1. When the flow regulating ring 1 is in the initial position, the protrusion 9 is close to one side of the limit groove 10. At this time, the inner ring hole 3 and the outer ring hole 4 do not overlap, and the fluid in the casing 11 cannot enter the heat extraction core tube 13 through the flow regulating ring 1 and the regulating inner ring 2. When the flow rate of the fluid injected into the casing 11 increases, the fluid flow rate in the annulus of the casing 11 above the isolation increases. When the fluid flow in the casing 11 is greater than the predetermined flow rate, the blade 5 of the driving mechanism drives the flow regulating ring 1 to rotate counterclockwise; when the flow regulating ring 1 rotates, it drives the protrusion 9 to move from one side to the other side of the limit groove 10; at the same time, the spring 7 is connected to the limit ring 6 and the flow regulating ring 1. When the flow regulating ring 1 rotates counterclockwise, the spring 7 is stretched and deformed.

[0053] When the protrusion 9 is in close contact with the other side of the limiting groove 10, the protrusion 9 is stuck in the limiting groove 10, so that the flow regulating ring 1 stops rotating. At this time, the inner ring hole 3 and the outer ring hole 4 overlap, and the fluid in the casing 11 enters the heat extraction core tube 13 through the inner ring hole 3 and the outer ring hole 4. After a period of time, the flow rate of the fluid injected into the casing 11 decreases. When the fluid flow rate at the casing 11 above the packer 12 is less than the predetermined flow rate, the spring 7 shrinks and rebounds due to elastic force, driving the flow regulating ring 1 to rotate clockwise, and the protrusion 9 moves from the other side of the limiting groove 10 to one side, and the flow regulating ring 1 returns to the initial position, thereby closing the inner ring hole 3 and the outer ring hole 4.

[0054] In the present invention, the driving mechanism comprises: blades 5;

[0055] On the side wall of the flow regulating ring 1, a plurality of mounting grooves are evenly arranged near the bottom, and the blades 5 are arranged inside each of the mounting grooves.

[0056] In the embodiment of the present invention, the mounting grooves are evenly distributed around the circumference of the flow regulating ring 1, and the top of the blade 5 is inclined in the counterclockwise direction of the flow regulating ring 1. When the fluid flow in the sleeve 11 reaches a predetermined value or more, when passing through the blade 5, the blade 5 will be pushed to rotate, and the blade 5 will drive the flow regulating ring 1 to rotate counterclockwise.

[0057] In the present invention, the method for determining the number of blades 5 or the parameters of springs 7 that can drive the flow regulating ring 1 to rotate when the fluid flow in the sleeve 11 is greater than a predetermined flow rate includes:

[0058] Obtaining the area of ​​a single blade 5, the installation angle of the blade 5, and the minimum tension that causes the spring 7 to deform;

[0059] Determine the force-bearing area of ​​a single blade 5 according to the area and installation angle of the blade 5;

[0060] Determine the impact force on the single blade 5 according to the predetermined flow rate and the force-bearing area of ​​the single blade 5;

[0061] The number of blades 5 to be installed or the parameters of the spring 7 are determined according to the minimum pulling force and the impact force on a single blade 5 .

[0062] In the embodiment of the present invention, determining the number of installed blades 5 or the parameters of spring 7 based on the minimum tension and the impact force received by a single blade 5 includes: if the minimum tension of the spring 7 has been determined, the number of installed blades 5 is: number of installed blades 5 = minimum tension of the spring 7 / impact force received by a single blade 5.

[0063] If the minimum tension of the spring has been determined, if the fluid is to be able to push the blades 5 to drive the flow regulating ring 1 to rotate when the predetermined flow rate is reached or above, so that the inner ring hole 3 and the outer ring hole 4 overlap, then the number of installed blades 5 needs to be determined to ensure that under the condition of the number of installed blades 5, when the predetermined flow rate is reached in the sleeve 11, the spring 7 can be stretched and deformed; when the flow rate is lower than the predetermined flow rate, the spring 7 does not deform to the length that makes the inner ring hole 3 and the outer ring hole 4 overlap. Because the distance that the flow regulating ring 1 rotates when the inner ring hole 3 and the outer ring hole 4 overlap is generally shorter, and the distance between the inner ring hole 3 and the outer ring hole 4 is closer when they are staggered, the tension on the spring 7 only needs to slightly exceed the minimum tension that can stretch it to produce deformation (static stiffness of the spring 7).

[0064] The parameter of the spring 7 is the elastic coefficient K. If the number of blades 5 is determined, the method for determining the parameters of the spring 7 is as follows: determine the sum of the impulses of all blades, that is, the sum of the impulses of the blades F impulse = the impulse F exerted on a single blade * the number of blades. The sum of the impulses of the blades is the pulling force F pull applied to the spring, that is, F impulse = F pull; obtain the maximum length X of the deformation of the spring 7, which is: the length (expansion) of the spring 7 stretched when the flow regulating ring 1 rotates to overlap the inner ring hole 3 and the outer ring hole 4; determine the spring elastic coefficient according to the sum of the impulses of the blades F impulse and the stretched length X of the spring using formula (2);

[0065] F pull = KX (2);

[0066] Where: Fpull is the tension on the spring, K is the spring elastic coefficient, and X is the amount of spring expansion and contraction.

[0067] If the number of blades 5 is determined, the sum of the impulses received by all blades 5 under a predetermined flow rate can be calculated, thereby determining the parameters of the spring 7.

[0068] After selecting the size of the blade 5, the upward side of the blade 5 is subjected to the impact of the fluid after installation. At this time, the area of ​​the single blade 5 is the side of the blade 5 subjected to the impact of the fluid, that is, the area of ​​the upward side; the installation angle of the blade 5 is the angle between the blade 5 and the horizontal line, and the value range of the angle is 30 to 60°.

[0069] In the present invention, the determining of the impact force on the single blade 5 according to the predetermined flow rate and the force-bearing area of ​​the single blade 5 includes:

[0070] Use formula (1) to determine the impact force on blade 5;

[0071] F=2ρSν 2 (1);

[0072] Wherein, F is the impact force on the blade 5, ρ is the density of the fluid, v is the flow velocity of the fluid, and S is the force-bearing area of ​​the blade 5.

[0073] In the embodiment of the present invention, according to the momentum theorem in engineering mechanics:

[0074] By the momentum theorem - FΔt = ΔmΔν;

[0075] And Δm=ρSνΔt, Δν=-2ν;

[0076] So -FΔt=-ρSνΔt·2ν;

[0077] That is, we get formula (1): F = 2ρSν 2 ;

[0078] Wherein: F is the impact force on the blade 5, Δm is the mass of water, ρ is the density of the fluid, v is the fluid flow rate, Δv is the velocity difference, S is the force area of ​​the blade 5, and Δt is the unit time.

[0079] The method for determining the force-bearing area of ​​blade 5 is: force-bearing area S of blade 5 = area of ​​blade 5 * cos installation angle of blade 5; for example, if the area of ​​a single blade 5 is 4 cm 2 , the installation angle of blade 5 is 45°, then the force area of ​​blade 5 S = 4*cos45 = 2.828cm 2 The flow rate of the fluid is calculated based on the annular space area between the casing 11 and the lower heat extraction core tube 17 and the predetermined flow rate.

[0080] The impact force on the blade 5 is the pressure exerted by the fluid from top to bottom on the blade 5. If the inner diameter of the casing 11 is 123 mm, the outer diameter of the flow regulating ring 1 is 100 mm, and the area of ​​the annular space is 0.004025 m 2 , the scheduled flow rate is 5m 3 / h, the flow rate is 0.345m / s, and the density of the fluid (water) is 1000kg / m 3 , the area of ​​blade 5 is 0.0002828m 2 , substituting into the above formula (1), the impact force F of a single blade 5 is determined to be 0.135 N. If the minimum tensile force of the spring 7 to produce deformation is designed to be 0.81 N, the number of blades 5 is determined to be 6 according to F.

[0081] If the scheduled flow rate is adjusted to 6m 3 / h, the flow rate is 0.414m / s, and the number of blades 5 is determined to be 6. According to formula (1), the sum of the impact forces borne by the 6 blades 5 is calculated to be 1.163N, so the parameters of the spring 7 are determined to be: elastic coefficient = 0.353N / cm.

[0082] In actual experimental application, if the predetermined flow rate is 5m 3 / h, the total flow rate of the fluid in the casing 11 is less than 5m 3 / h, flow regulating loop 1 is not started, the injected water does not flow directly downward, and the flow rate is greater than 5m 3 / h, flow regulating loop 1 is just started, and the total flow rate of the fluid is 10m 3 / h, the flow rate in the downward diverted oil pipe is 6m 3 / h, rotary flow automatic distribution device 16 diversion 4m 3 / h, total outlet flow 10m 3 / h, at this time the maximum design working condition is reached and the spring 7 rebounds to the maximum position of the limiter.

[0083] The deformation length of spring 7 = the impact force F on blade 5 and the rotation distance L of the adjusting ring driven by blade 5, the area of ​​blade 5 is 4cm 2 , the annular space area of ​​the casing 11 is known, and the impact force on the blade 5 is substituted by the above formula (1), and the minimum starting flow rate (predetermined flow rate) is 5m 3 / h, spring 7 just started, F pull = 0.81N (minimum), when the total flow reaches 10m 3 / h, spring 7 is restrained by the limiter, and the F pull on spring 7 = 1.163N (maximum). At this time, spring 7 receives the maximum flow impact, and the flow rate in the downward oil pipe is 6m 3 / h, when the inner ring hole 3 and the outer ring hole 4 overlap, the flow is split by 4m 3 / h, total outlet flow 10m 3 / h. Due to the action of the limiter, the maximum deformation of the spring 7 in the whole process is 1cm (expansion and contraction). After calculation, the spring 7 with a parameter of 0.353N / mm can meet the operation of the device.

[0084] The present invention further includes: a righting mechanism;

[0085] The straightening mechanism is connected to the outer wall of the adjusting inner ring 2 and is located below the flow adjusting ring 1. The straightening mechanism is used to limit the distance between the outer wall of the adjusting inner ring 2 and the inner wall of the sleeve 11 to a predetermined distance.

[0086] In the embodiment of the present invention, the straightening mechanism is used to keep the inner regulating ring 2 and the flow regulating ring 1 in the middle position in the casing 11, so as to prevent the unstable flow velocity of the fluid in the casing 11 from disturbing the flow regulating ring 1 and the inner regulating ring 2, so that they deviate from the center in the casing 11 and affect the subsequent flow distribution. At the same time, the straightening mechanism is located below the flow regulating ring 1 and can support it, so as to prevent the flow regulating ring 1 from sliding downward due to the impact of the fluid.

[0087] In the present invention, the centralizing mechanism comprises: a plurality of centralizers 8;

[0088] The plurality of centralizers 8 are evenly distributed along the outer wall of the adjusting inner ring 2. The main body of the centralizer 8 is a fan-shaped body, and the inwardly concave side thereof is connected to the outer wall of the adjusting inner ring 2.

[0089] The predetermined distance has a value range of 2 to 3 mm.

[0090] In the embodiment of the present invention, the number of centralizers 8 is 4, which are evenly distributed on the outer wall of the adjusting inner ring 2. When the fluid in the casing 11 reaches the centralizers 8 downward, it can enter the inside of the oil pipe 14 downward through the gap between each centralizer 8. When the heat extraction core tube is lowered into the casing 11, the centralizer 8 can ensure that the adjusting inner ring 2 is in the middle position, so that the narrowed diameter portion can be smoothly inserted into the oil pipe 14 with a narrower diameter. At the same time, the thickness of the centralizer 8 must exceed the width of the blade 5, so as to ensure that the blade 5 does not touch the inner wall of the casing 11.

[0091] The present invention further includes: a ball;

[0092] A ball groove is provided at the top of the centralizer 8 , and a ball is provided in the ball groove. The top of the ball contacts the bottom surface of the flow regulating ring 1 .

[0093] In the embodiment of the present invention, the number of balls can be multiple, which is specifically set according to the number that the ball groove can accommodate. When the flow regulating ring 1 rotates clockwise or counterclockwise, its bottom surface contacts and slides with the balls. The balls not only support the flow regulating ring 1, but also reduce the friction force of the flow regulating ring 1 directly contacting the centralizer 8 when rotating, thereby reducing resistance.

[0094] The rotary flow automatic distribution device 16 for geothermal wells in oil well transformation of the present invention is composed of two parts from top to bottom: a limit ring 6, which is installed on the outer wall of the regulating inner ring 2 and is used to limit the positions of the openings of the flow regulating ring 1 and the openings of the regulating inner ring 2; the regulating inner ring 2 is connected to the core tube at the upper part and the reduced diameter core tube at the lower part, the regulating inner ring 2 is provided with an inner ring hole 3, and the outer wall receives the limit ring 6, the flow regulating ring 1 and the limiter; a spring 7 is placed on the inner side of the flow regulating ring 1 and is used to rebound the flow regulating ring 1; the flow regulating ring 1 is placed on the outer wall of the regulating inner ring 2, the flow regulating ring 1 is provided with an outer ring hole 4, and a blade 5 is installed on the side wall, When the blade 5 drives the flow regulating ring 1 to rotate to the maximum limit position of the limit ring 6, the inner ring hole 3 and the outer ring hole 4 just coincide, and the injected fluid enters the heat core tube 13 to achieve the purpose of diversion; the ball is placed in the groove at the top of the stabilizer 8, which supports the flow regulating ring 1 and effectively reduces the friction between the two; the blade 5 is obliquely inserted into the mounting groove at the lower part of the flow regulating ring 1, and is used to drive the flow regulating ring 1 to rotate, convert the kinetic energy of the injected fluid into the mechanical energy of the blade 5, and then drive the flow regulating ring 1 to rotate; the stabilizer 8 is installed on the outer wall of the adjusting inner ring 2, one is used to support the upper flow regulating ring 1, and the other is to limit the distance between the heat core tube 13 and the casing 11, to ensure that the blade 5 does not touch the inner wall of the casing, so that the device operates within a safe range.

[0095] During the test, the present invention adopts a test well casing 11 with an inner diameter of 123 mm, a hot core pipe 13 with an outer diameter of 75 mm, and after the packer 12 is hung with an oil pipe 14 to plug the perforation 15 layers, the lower hot core pipe 17 begins to shrink above the packer 12; the design requires a total flow rate of 10m 3 When the rotary flow automatic distribution device 16 of the present invention is not installed, the maximum flow rate is 7m 3 / h, after installing the rotary flow automatic distribution device 16 of the present invention, the flow rate of the casing 11 in the well reaches the design flow rate requirement of 10m 3 / h, and the flow rate in the oil pipe 14 is maintained at 5-6m 3 / h.

[0096] It can be understood that the above-mentioned various embodiments mentioned in the present invention can be combined with each other to form a combined embodiment without violating the principle logic. Due to space limitations, the present invention will not go into details.

[0097] The present invention proposes a rotary flow automatic distribution device for geothermal wells in oil well transformation. By setting a flow regulating ring 1 on the regulating inner ring 2 above the oil pipe 14, when the fluid flow in the casing 11 above the oil pipe 14 increases, the flow regulating ring 1 is automatically opened by the blade 5, so that the fluid in the casing 11 directly enters the core heat pipe. When the flow in the casing 11 decreases, the flow regulating ring 1 is reset by the spring 7 of the limit mechanism, thereby achieving the purpose of automatic diversion. The present invention has a simple structure, good stability, simple manufacturing and installation, low production and maintenance costs, is not affected by the reduction in diameter, ensures the circulation and heat exchange of the fluid in the wellbore, has high geothermal energy utilization efficiency, consumes less power, and is suitable for promotion and application.

[0098] Embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the marketplace, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A rotary flow automatic distribution device in a geothermal well for oil well transformation, characterized in that: include: A driving mechanism, a flow regulating ring (1), an regulating inner ring (2) and a limiting mechanism; The flow regulating ring (1) is sleeved on the outside of the regulating inner ring (2), and the regulating inner ring (2) is connected to the heat extracting core tube (13); The adjusting inner ring (2) is provided with an inner ring hole (3), the flow adjusting ring (1) is provided with an outer ring hole (4), and when the flow adjusting ring (1) is in an initial position, the inner ring hole (3) and the outer ring hole (4) are staggered in position; The flow regulating ring (1) is connected to the driving mechanism for driving the ring to rotate when the flow rate of the fluid in the sleeve (11) is greater than a predetermined flow rate, by the impulse of the fluid at the flow rate; The limiting mechanism is connected to the flow regulating ring (1) and the regulating inner ring (2) respectively, and is used to limit the flow regulating ring (1) to rotate to the maximum limit when the inner ring hole (3) overlaps with the outer ring hole (4), and to drive the flow regulating ring (1) to rotate to the initial position when the fluid flow in the sleeve (11) is less than the predetermined value.

2. The rotary flow automatic distribution device for geothermal wells in oil well transformation according to claim 1 is characterized in that: The limiting mechanism comprises: a limiting ring (6) and a spring (7); The limiting ring (6) is sleeved on the outside of the adjusting inner ring (2) and is located above the flow adjusting ring (1); A limiting groove (10) is arranged on the side wall of the limiting ring (6) near the bottom, and a protrusion (9) is arranged on the top of the flow regulating ring (1), and the protrusion (9) is inserted into the limiting groove (10). When the protrusion (9) contacts one side of the limiting groove (10), the flow regulating ring (1) is in an initial position, and when the protrusion (9) contacts the other side of the limiting groove (10), the flow regulating ring (1) rotates to the maximum limit position; The spring (7) is located between the limiting ring (6) and the adjusting inner ring (2); one end of the spring (7) is connected to the limiting ring (6), and the other end is connected to the flow adjusting ring (1); the spring (7) is located close to one side of the limiting groove (10).

3. The rotary flow automatic distribution device in the oil well transformation geothermal well according to claim 2 is characterized in that: The driving mechanism comprises: a blade (5); Mounting grooves are evenly arranged on the side wall of the flow regulating ring (1) near the bottom, and the blades (5) are fixed in the mounting grooves.

4. The rotary flow automatic distribution device for geothermal wells in oil well transformation according to claim 3 is characterized by: The method for determining the number of blades (5) to be installed or the parameters of the spring (7) capable of driving the flow regulating ring (1) to rotate when the flow rate of the fluid in the sleeve (11) is greater than a predetermined flow rate comprises: Obtaining the area of ​​a single blade (5), the installation angle of the blade (5), and the minimum tension that causes the spring (7) to deform; Determining the force-bearing area of ​​a single blade (5) according to the area and installation angle of the blade (5); Determining the impact force received by the single blade (5) according to the predetermined flow rate and the force-bearing area of ​​the single blade (5); The number of blades (5) to be installed or the parameters of the spring (7) are determined based on the minimum pulling force and the impact force received by a single blade (5).

5. The rotary flow automatic distribution device in the oil well transformation geothermal well according to claim 4 is characterized in that: Determining the impact force exerted on the single blade (5) according to the predetermined flow rate and the force-bearing area of ​​the single blade (5) comprises: Use formula (1) to determine the impact force on blade (5); F=2ρSν 2 (1); Wherein, F is the impact force on the blade (5), ρ is the density of the fluid, v is the flow velocity of the fluid, and S is the force-bearing area of ​​the blade (5).

6. The rotary flow automatic distribution device in a geothermal well for oil well transformation according to any one of claims 1 to 5, characterized in that: Also includes: Righting institutions; The straightening mechanism is connected to the outer wall of the regulating inner ring (2) and is located below the flow regulating ring (1). The straightening mechanism is used to limit the distance between the outer wall of the regulating inner ring (2) and the inner wall of the sleeve (11) to a predetermined distance.

7. The rotary flow automatic distribution device in the oil well transformation geothermal well according to claim 6 is characterized in that: The centralizing mechanism comprises: a plurality of centralizers (8); The plurality of centralizers (8) are evenly distributed along the circumference of the outer wall of the adjusting inner ring (2); the main body of the centralizer (8) is a fan-shaped body, and the inwardly concave side thereof is connected to the outer wall of the adjusting inner ring (2); The predetermined distance has a value range of 2 to 3 mm.

8. The rotary flow automatic distribution device in the oil well transformation geothermal well according to claim 7 is characterized in that: Also includes: Ball bearings; A ball groove is arranged at the top of the centralizer (8), a ball is arranged in the ball groove, and the top of the ball contacts the bottom surface of the flow regulating ring (1).

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