Geothermal recharging well wellhead pressure regulating device

Abstract

The present application relates to the technical field of geothermal fluid recharge, and discloses a geothermal recharge well wellhead pressure regulating device, which comprises a sealed shell, a discharge pipe of the sealed shell extends into the sealed shell, and an adjusting cavity is formed between the discharge pipe and a bottom cavity of the sealed shell, and the discharge pipe is communicated with the adjusting cavity; wherein a plurality of groups of channel plates are arranged on a geothermal fluid flow path in the adjusting cavity in a blocking mode, and the plurality of groups of channel plates separate the adjusting cavity; a flow control fluid is movably arranged in the sealed shell at the top of the adjusting cavity, and the flow control fluid insulates the discharge pipe and the internal space of the sealed shell, so that when the liquid level of the downhole geothermal fluid is low, the intermittent filling of the geothermal fluid in the vertical recharge pump pipe is overcome, the negative pressure pulsation formed by the self-weight causes the vaporization of the recharge pipe, the gas-liquid mixed flow state is formed, the recharge pipe is transmitted to the flow metering section, and the recharge well recharge volume metering data fluctuation is not accurate.

Description

Technical Field

[0001] This invention relates to the technical field of geothermal fluid reinjection, and in particular to a geothermal reinjection wellhead pressure regulating device. Background Technology

[0002] Deep geothermal energy, as a renewable green energy source, is extracted and utilized from groundwater. It is an effective way to conserve energy, reduce emissions, and protect the environment, and has therefore received widespread attention. It is extensively used in geothermal heating, aquaculture, and health and wellness projects. Based on the formulation of regional geothermal development and utilization plans, orderly development and utilization should be ensured to prevent disorderly extraction and achieve stable and sustainable development and utilization. During implementation, the supervision and control of geothermal fluid extraction and reinjection are key tasks, and accurate measurement of geothermal fluid extraction and reinjection volumes is fundamental to this task.

[0003] However, under the current large-scale development and utilization of geothermal resources, there is a common phenomenon of inaccurate fluctuations in the metering data of reinjection wells, causing confusion in the measurement of geothermal resources. The main reason for this is that when the geothermal fluid level in the well is low, the intermittently filling geothermal fluid in the vertical reinjection pump pipe causes negative pressure pulsation due to its own weight, resulting in vaporization in the reinjection pipe and forming a gas-liquid mixed flow state, which is then transmitted to the flow metering section. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is: when the geothermal fluid level in the well is low, the geothermal fluid that is intermittently filled in the vertical reinjection pump pipe will cause the negative pressure pulsation formed by its own weight, resulting in vaporization of the reinjection pipe and forming a gas-liquid mixed flow state. When this is transmitted to the flow metering section, it will cause the reinjection volume measurement data of the reinjection well to fluctuate inaccurately.

[0005] The above-mentioned technical problems are solved by the following technical solution: This invention proposes a geothermal reinjection wellhead pressure regulating device, which includes a sealed shell, a discharge pipe of the sealed shell extending into the sealed shell and forming a regulating cavity between the discharge pipe and the bottom cavity of the sealed shell, and an inlet pipe communicating with the regulating cavity; wherein, a number of channel plates are arranged in the regulating cavity along the geothermal fluid flow path, and the number of channel plates separate the regulating cavity; a control fluid is also movably arranged in the sealed shell at the top of the regulating cavity, and the control fluid isolates the discharge pipe from the internal space of the sealed shell.

[0006] In a preferred embodiment of the geothermal reinjection wellhead pressure regulating device of the present invention: the channel plate includes a first pressure stabilizing plate, a second pressure stabilizing plate, a third pressure stabilizing plate, a fourth pressure stabilizing plate, and a flow passage component arranged coaxially; wherein, the first pressure stabilizing plate, the second pressure stabilizing plate, the third pressure stabilizing plate, the fourth pressure stabilizing plate, and the flow passage component are stacked sequentially from the bottom to the top of the regulating cavity; at least one set of first perforation group, second perforation group, third perforation group, and fourth perforation group are correspondingly formed on the first pressure stabilizing plate, the second pressure stabilizing plate, the third pressure stabilizing plate, and the fourth pressure stabilizing plate.

[0007] In a preferred embodiment of the geothermal reinjection wellhead pressure regulating device of the present invention: the first perforation group includes a plurality of first holes distributed in a circle; if there is more than one first perforation group, each group of first perforation groups is arranged with the same center, and the circumferential trajectories corresponding to different first perforation groups are arranged at intervals in the radial direction.

[0008] In a preferred embodiment of the geothermal reinjection wellhead pressure regulating device of the present invention: the second perforation group includes a plurality of second holes distributed in a circle, the third perforation group includes a plurality of third holes distributed in a circle, and the fourth perforation group includes a plurality of fourth holes distributed in a circle; wherein the arrangement of the second, third and fourth holes is the same as that of the first hole, and the holes in adjacent perforation groups are staggered.

[0009] In a preferred embodiment of the geothermal reinjection wellhead pressure regulating device of the present invention: a first stabilizing layer is formed between the first and second stabilizing plates, a second stabilizing layer is formed between the second and third stabilizing plates, a third stabilizing layer is formed between the third and fourth stabilizing plates, and a fourth stabilizing layer is formed between the fourth stabilizing plate and the flow-through component. The first, second, third, and fourth stabilizing layers have the same height.

[0010] In a preferred embodiment of the geothermal reinjection wellhead pressure regulating device of the present invention: a first flow stabilizing pipe, a second flow stabilizing pipe, a third flow stabilizing pipe, and a fourth flow stabilizing pipe are fixedly connected to the top of the corresponding positions of the first, second, third, and fourth holes, respectively; a first flow stabilizing hole, a second flow stabilizing hole, a third flow stabilizing hole, and a fourth flow stabilizing hole are symmetrically opened on the sidewalls of the first, second, third, and fourth flow stabilizing pipes, respectively; wherein, the straight line where the symmetrically opened flow stabilizing holes are located is the first direction line, and the straight line where the flow stabilizing pipe where this group of flow stabilizing holes is located and the center of the pressure stabilizing plate are located is the second direction line, and the first direction line is perpendicular to the second direction line.

[0011] In a preferred embodiment of the geothermal reinjection wellhead pressure regulating device of the present invention: the diameters of the second hole, the third hole, the fourth hole and the first hole gradually increase in size; the diameters of the second flow stabilizing hole, the third flow stabilizing hole, the fourth flow stabilizing hole and the first flow stabilizing hole gradually increase in size.

[0012] In a preferred embodiment of the geothermal reinjection wellhead pressure regulating device of the present invention: the flow passage is provided with a plurality of circumferentially distributed flow passages, the diameter of the flow passages being larger than the diameter of the fourth flow stabilizing hole on the fourth flow stabilizing pipe.

[0013] In a preferred embodiment of the geothermal reinjection wellhead pressure regulating device of the present invention: the sealing shell includes a main shell and a sealing cover and an interface flange that are sealed and fixed at its top and bottom ends, and the main shell has an accommodating space; the discharge pipe is fixedly connected to the middle of the interface flange, one end of which extends into the main shell, and the first pressure stabilizing plate, the second pressure stabilizing plate, the third pressure stabilizing plate, the fourth pressure stabilizing plate and the flow passage are fixedly sleeved on the discharge pipe.

[0014] In a preferred embodiment of the geothermal reinjection wellhead pressure regulating device of the present invention: a plurality of negative pressure pads are fixed in a circular shape at the top of the discharge pipe located inside the main shell, and a negative pressure channel is formed between the negative pressure pads; the main shell accommodating space between the negative pressure pads and the interface flange forms the regulating cavity; a discharge cavity is formed between the first pressure stabilizing plate and the interface flange, and the discharge pipe is connected to the discharge cavity.

[0015] In a preferred embodiment of the geothermal reinjection wellhead pressure regulating device of the present invention: a flow control cavity is formed between the negative pressure pad and the sealing cover, and the flow control fluid is slidably disposed in the flow control cavity; a cone is fixedly connected to the middle of the bottom end of the flow control fluid, and the cone can be inserted into the discharge pipe; wherein, when the cone is about to detach from the discharge pipe, the flow control fluid abuts against the sealing cover.

[0016] In a preferred embodiment of the geothermal reinjection wellhead pressure regulating device of the present invention: the flow control fluid is a cylindrical hollow structure with a locking block fixed on its outer wall, and a number of sliding grooves are opened on the circumferential inner wall of the flow control cavity, and the locking block is slidably inserted into the sliding groove.

[0017] In a preferred embodiment of the geothermal reinjection wellhead pressure regulating device of the present invention: the flow control fluid is a spherical hollow structure, and its outer wall is slidably attached to the wall of the flow control cavity.

[0018] In a preferred embodiment of the geothermal reinjection wellhead pressure regulating device of the present invention: a measuring pipe is fixedly connected to the discharge pipe located on the outside, and an observation window is also provided on the main body shell at the corresponding position of the flow control cavity.

[0019] The beneficial effects of this invention are as follows: The geothermal reinjection wellhead pressure regulating device of the present invention can effectively solve the problems of pipeline vaporization and gas-liquid mixing caused by negative pressure pulsation during geothermal reinjection, ensure the accuracy of reinjection volume measurement, and realize automatic and stable regulation of wellhead pressure.

[0020] The device uses staggered perforations in multi-stage channel plates and a flow stabilizing pipe structure to buffer and attenuate fluid negative pressure fluctuations step by step, breaking the conditions for turbulence formation and laying a solid foundation for stable operating conditions for pressure regulation. The flow control, combined with the conical body, can dynamically change the flow area of ​​the discharge pipe to match fluid pressure changes in real time. The negative pressure pad can also prevent the device from shutting off under extreme operating conditions, ensuring the continuity of reinjection. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein: Figure 1 A cross-sectional view of the wellhead pressure regulating device for geothermal reinjection wells is shown.

[0022] Figure 2 A schematic diagram of the channel plate installation for the geothermal reinjection wellhead pressure regulating device is shown.

[0023] Figure 3 The diagram shows the structure of the first pressure stabilizing plate of the geothermal reinjection wellhead pressure regulating device.

[0024] Figure 4 The diagram shows the structure of the second pressure stabilizing plate of the geothermal reinjection wellhead pressure regulating device.

[0025] Figure 5 The diagram shows the structure of the third pressure stabilizing plate of the geothermal reinjection wellhead pressure regulating device.

[0026] Figure 6 The diagram shows the structure of the fourth pressure stabilizing plate of the geothermal reinjection wellhead pressure regulating device.

[0027] Figure 7 A schematic diagram showing the channel plate spacing height of the geothermal reinjection wellhead pressure regulating device is shown.

[0028] Figure 8 A schematic diagram of the flow passage component of the geothermal reinjection wellhead pressure regulating device is shown.

[0029] Figure 9 A schematic diagram of the internal chamber of the sealed housing of the geothermal reinjection wellhead pressure regulating device is shown.

[0030] Figure 10 A schematic diagram of the negative pressure channel distribution of the geothermal reinjection wellhead pressure regulating device is shown.

[0031] Figure 11 The diagram shows different structural fluid control installation diagrams of the wellhead pressure regulating device for geothermal reinjection wells.

[0032] Figure 12 A schematic diagram of the external structure of the geothermal reinjection wellhead pressure regulating device is shown. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0034] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0035] Example 1

[0036] Reference Figures 1-12 The first embodiment of the present invention provides a geothermal reinjection wellhead pressure regulating device T, which is used to solve the problems of pipeline vaporization and gas-liquid mixing caused by negative pressure pulsation during geothermal reinjection, ensure the accuracy of reinjection volume measurement, and realize automatic and stable regulation of wellhead pressure.

[0037] The device includes a sealed housing 100, a discharge pipe 101 extending into the sealed housing 100 and forming a regulating chamber Q1 between the discharge pipe 102 and the bottom cavity of the sealed housing 100. The discharge pipe 102 is connected to the regulating chamber Q1. The geothermal fluid to be reinjected enters the regulating chamber Q1 through the discharge pipe 102, and after being stabilized and depressurized, it is introduced into the geothermal layer through the discharge pipe 101 to complete the reinjection.

[0038] The regulating chamber Q1 is equipped with several sets of channel plates 200 that block the flow path of the geothermal fluid. The several sets of channel plates 200 separate the regulating chamber Q1 to form a multi-stage stable flow space. By buffering and attenuating the negative pressure fluctuations of the fluid step by step, the fluid is prevented from acting directly on the subsequent structure in a turbulent state, thus providing a stable working condition for pressure regulation.

[0039] Furthermore, a fluid control 300 is movably disposed within the sealing housing 100 at the top of the regulating chamber Q1. The fluid control 300 isolates the discharge pipe 101 from the internal space of the sealing housing 100. By changing the flow area of ​​the discharge pipe 101 through its own up-and-down floating, it dynamically matches the changes in fluid pressure and realizes real-time adjustment of negative pressure.

[0040] Specifically, the channel plate 200 includes a first voltage regulator plate 201, a second voltage regulator plate 202, a third voltage regulator plate 203, a fourth voltage regulator plate 204 and a flow-through component 205 arranged coaxially. The multi-plate stacking design can achieve the gradual attenuation of negative pressure fluctuations and improve the flow stabilization effect.

[0041] The first pressure stabilizing plate 201, the second pressure stabilizing plate 202, the third pressure stabilizing plate 203, the fourth pressure stabilizing plate 204 and the flow passage 205 are stacked sequentially from the bottom to the top of the regulating cavity Q1 to form a fluid flow stabilizing channel from bottom to top, ensuring that the fluid completes multi-stage processing according to the preset path.

[0042] The first pressure stabilizing plate 201, the second pressure stabilizing plate 202, the third pressure stabilizing plate 203, and the fourth pressure stabilizing plate 204 each have at least one set of first perforation group 201a, second perforation group 202a, third perforation group 203a, and fourth perforation group 204a respectively, which are coaxially formed. Adjacent perforation groups are staggered. The staggered layout can extend the fluid flow channel, break the conditions for turbulence formation, and avoid direct fluid impact, further weakening the transmission of negative pressure pulsation.

[0043] Combination Figure 3 The first perforation group 201a includes a first hole 201a-1 distributed in a circular pattern. The circular distribution design can ensure that the fluid diffuses uniformly in the radial direction and avoid pressure sudden changes caused by excessive local flow velocity.

[0044] If there is more than one first perforation group 201a, the several first perforation groups 201a are coaxially and concentrically arranged with the same center as the reference. The first holes 201a-1 of each first perforation group 201a are evenly distributed along the circumference of different radii. The distribution trajectory of all first holes 201a-1 is concentric with the reference center, and the circumferential trajectories corresponding to different first perforation groups 201a are arranged in a spaced manner in the radial direction. The spaced arrangement can enable the fluid to achieve layered flow in the radial layer, further improve the flow field uniformity, and reduce pressure fluctuations.

[0045] In this embodiment, two sets of first perforation groups 201a are preferably provided, with radii of R1 and R2 respectively, where R1 is greater than R2, forming two sets of first perforation groups 201a distributed in concentric circles.

[0046] Furthermore, in combination Figures 3-6 The second perforation group 202a includes a second hole 202a-1 distributed in a circle, the third perforation group 203a includes a third hole 203a-1 distributed in a circle, and the fourth perforation group 204a includes a fourth hole 204a-1 distributed in a circle.

[0047] The second hole 202a-1, the third hole 203a-1 and the fourth hole 204a-1 are arranged in the same way as the first hole 201a-1, and the holes in the two adjacent perforation groups are staggered. The uniform arrangement ensures the continuity of fluid flow, and the staggered arrangement of adjacent holes continuously enhances the flow stabilization effect and avoids the superposition of fluctuations.

[0048] Figure 4 In the process, the second perforation group 202a is preferably provided in three groups, and the radii of the three groups of second perforation groups 202a are R3, R4 and R5 in ascending order. Among them, the two groups of first perforation groups 201a are located in the gap between the three groups of second perforation groups 202a, and the first hole 201a-1 and the second hole 202a-1 are misaligned.

[0049] Furthermore, Figure 5 In the middle, the third perforation group 203a is preferably provided in two groups, and the radii of the two groups of third perforation groups 203a are R6 and R7 respectively, wherein R6 is less than R4 and R7 is greater than R4, and the second hole 202a-1 and the third hole 203a-1 in the three groups of second perforation groups 202a are staggered.

[0050] Furthermore, Figure 6 In the process, the fourth perforation group 204a is preferably provided in two groups, with the radii of the two groups of fourth perforation groups 204a being R8 and R9 respectively, where R8 is greater than R9. The fourth hole 204a-1 is staggered from the third hole 203a-1.

[0051] A first stabilizing layer A1 is formed between the first voltage regulator 201 and the second voltage regulator 202; a second stabilizing layer A2 is formed between the second voltage regulator 202 and the third voltage regulator 203; a third stabilizing layer A3 is formed between the third voltage regulator 203 and the fourth voltage regulator 204; and a fourth stabilizing layer A4 is formed between the fourth voltage regulator 204 and the flow-through component 205. The first stabilizing layer A1, the second stabilizing layer A2, the third stabilizing layer A3, and the fourth stabilizing layer A4 have the same height. Figure 7 As shown, the height of the first stabilizing layer A1, the second stabilizing layer A2, the third stabilizing layer A3, and the fourth stabilizing layer A4 is all H. The design of the same layer height can ensure that the buffer capacity of each stabilizing layer is consistent, ensuring that the negative pressure fluctuation is uniformly attenuated in each stabilizing layer and avoiding local insufficient buffering.

[0052] The top of the corresponding holes of the first hole 201a-1, the second hole 202a-1, the third hole 203a-1, and the fourth hole 204a-1 are respectively fixedly connected to the first flow stabilizing tube 201a-2, the second flow stabilizing tube 202a-2, the third flow stabilizing tube 203a-2, and the fourth flow stabilizing tube 204a-2. The flow stabilizing tubes can guide and constrain the fluid passing through the perforations, prevent the fluid from spreading disorderly in the stable layer, and improve the stability of the flow field.

[0053] The first flow stabilizing pipe 201a-2, the second flow stabilizing pipe 202a-2, the third flow stabilizing pipe 203a-2 and the fourth flow stabilizing pipe 204a-2 are respectively provided with a first flow stabilizing hole K1, a second flow stabilizing hole K2, a third flow stabilizing hole K3 and a fourth flow stabilizing hole K4 symmetrically opened on the side walls. The symmetrically opened flow stabilizing holes can make the fluid flow out uniformly from the side of the flow stabilizing pipe, further breaking the turbulent state and realizing secondary flow stabilization.

[0054] Among them, the straight line where the symmetrically opened flow stabilizing holes are located is the first direction line X1, and the straight line where the center of the flow stabilizing pipe and the pressure stabilizing plate of this group of flow stabilizing holes are located is the second direction line X2. The first direction line X1 and the second direction line X2 are perpendicular. The perpendicular setting can make the fluid form a radial diffusion flow after flowing out of the flow stabilizing pipe, and form a cross flow with the perforation of the subsequent pressure stabilizing plate, further weakening the energy of negative pressure fluctuation.

[0055] The diameters of the second hole 202a-1, the third hole 203a-1, the fourth hole 204a-1, and the first hole 201a-1 gradually increase. This progressively larger diameter design, combined with the staggered perforation group, enables a step-by-step buffering of "throttling and expansion," avoiding sudden changes in fluid pressure, effectively suppressing the transmission of negative pressure pulsations, and ensuring that fluid flow efficiency is not affected.

[0056] Specifically, considering the flow path of geothermal fluid reinjection, the perforation diameter on each pressure stabilizing plate in this scheme adopts a stepped design with the largest diameter at the bottom, the smallest diameter in the middle, and gradually increasing upwards without exceeding the bottom diameter.

[0057] The specific order is as follows: the first hole 201a-1 of the bottom first voltage regulator 201 has the largest diameter, the second hole 202a-1 of the second voltage regulator 202 above it has the smallest diameter, the third hole 203a-1 of the third voltage regulator 203 has a diameter slightly larger than the second hole 202a-1, and the fourth hole 204a-1 of the fourth voltage regulator 204 has a diameter slightly larger than the third hole 203a-1, but still smaller than the first hole 201a-1.

[0058] The orifice design is adapted to the fluid flow characteristics and the target depth for steady flow and pressure reduction. Its core advantages are as follows: First, it ensures smooth initial flow. When the fluid enters the first hole 201a-1 at the bottom from the discharge chamber Q2, the maximum orifice diameter can reduce the initial inflow resistance of the fluid and avoid a sudden drop in local pressure caused by excessive throttling at the inlet, thus laying the foundation for subsequent steady flow.

[0059] Then, it can enhance the core throttling and flow stabilization effect. When the fluid flows from the largest first hole 201a-1 into the smallest second hole 202a-1 above, the hole diameter suddenly narrows to form a strong throttling effect, which can quickly attenuate the negative pressure pulsating energy carried in the fluid, and at the same time force the turbulent fluid to be re-ordered, greatly improving the uniformity of the flow field.

[0060] Finally, the gradual expansion design from the second hole 202a-1 to the third hole 203a-1 and the fourth hole 204a-1 enables a smooth pressure transition. This design avoids sudden pressure changes caused by the fluid abruptly entering the wide channel from the narrow channel after throttling. It allows the fluid pressure to rise slowly along the flow direction and the flow velocity to transition smoothly, effectively preventing the generation of secondary turbulence. At the same time, the diameter of the fourth hole 204a-1 is still smaller than that of the first hole, which can maintain a certain flow resistance and ensure that the negative pressure fluctuation attenuation effect is not weakened. Ultimately, it provides a stable force environment for the upper fluid control 300, ensuring the accuracy and stability of pressure regulation.

[0061] Furthermore, the diameters of the second flow stabilizing orifice K2, the third flow stabilizing orifice K3, the fourth flow stabilizing orifice K4, and the first flow stabilizing orifice K1 gradually increase in sequence, consistent with the changing trend of the perforation orifice diameter, forming a synergistic buffering effect, ensuring a smooth transition of fluid velocity in each level of the flow stabilizing pipe, and further improving the flow stabilization and pressure reduction effect.

[0062] The flow-through component 205 has several sets of flow-through holes 205a arranged in a circular pattern. The diameter of the flow-through holes 205a is larger than that of the fourth flow-stabilizing hole K4 opened on the fourth flow-stabilizing pipe 204a-2. The large diameter design of the flow-through component 205 provides a final smooth flow channel for the fluid, ensuring that the fluid acts upward on the control fluid at a uniform flow rate after passing through multiple stages of flow stabilization, thus providing a basis for the stable floating of the control fluid.

[0063] The sealing housing 100 includes a main housing 103 and a sealing cover 104 and an interface flange 105 that are fixed to its top and bottom ends. The main housing 103 has an accommodating space. The sealing structure design can prevent fluid leakage and ensure the pressure stability of the housing cavity, providing a sealed environment for pressure regulation.

[0064] The discharge pipe 101 is fixedly connected to the middle of the interface flange 105, with one end extending into the main body shell 103. The first pressure stabilizing plate 201, the second pressure stabilizing plate 202, the third pressure stabilizing plate 203, the fourth pressure stabilizing plate 204 and the flow-through component 205 are fixedly sleeved on the discharge pipe 101. The fixed sleeve connection ensures that each channel plate is coaxial with the discharge pipe, avoids fluid deviation caused by eccentricity, ensures uniform flow stabilization, and improves the connection stability of the overall structure.

[0065] Furthermore, several sets of negative pressure pads 101a are circumferentially fixed at the top of the discharge pipe 101 located inside the main shell 103. Negative pressure channels 101b are formed between the negative pressure pads 101a. The negative pressure pads provide support and positioning for the top of the discharge pipe and form a backup flow channel under extreme negative pressure conditions through the negative pressure channels. This ensures that even if the discharge pipe is blocked by the controlled fluid, the geothermal fluid can still enter the discharge pipe through the negative pressure channels, avoiding interruption of the device flow and ensuring the continuity of reinjection.

[0066] The space between the negative pressure pad 101a and the interface flange 105 in the main shell 103 forms the adjustment cavity Q1.

[0067] A discharge chamber Q2 is formed between the first pressure stabilizing plate 201 and the interface flange 105. The discharge chamber Q2 is part of the regulating chamber Q1. The discharge pipe 102 is connected to the discharge chamber Q2. The discharge chamber Q2 provides an initial buffer space for the fluid, so that the fluid is evenly distributed after entering from the discharge pipe and then flows smoothly to the perforation of the first pressure stabilizing plate 201, avoiding local pressure fluctuations caused by direct impact of the fluid.

[0068] A flow control cavity Q3 is formed between the negative pressure pad 101a and the sealing cover 104. The flow control fluid 300 is slidably disposed in the flow control cavity Q3. The flow control cavity provides dedicated space for the up and down floating of the flow control fluid, avoiding interference from other structures with the adjustment action of the flow control fluid and ensuring the sensitivity of pressure regulation.

[0069] A conical body 301 is fixedly connected to the middle of the bottom end of the fluid control device 300. The conical body 301 can be inserted into the discharge pipe 101. The conical body and the discharge pipe 101 adopt a conical surface sealing design, which can not only tightly seal the discharge pipe when the negative pressure is large, reducing the fluid flow area to suppress the increase of negative pressure, but also smoothly disengage under the action of fluid thrust, increasing the flow area to alleviate negative pressure and ensuring the accuracy of pressure regulation.

[0070] When the cone 301 is about to detach from the discharge pipe 101, the control fluid 300 abuts against the sealing cover 104. This abutting design limits the maximum upward stroke of the control fluid, avoids the fluid channel from getting out of control due to excessive upward movement, and at the same time prevents structural damage caused by hard collision between the control fluid and the sealing cover, thus ensuring the service life of the device.

[0071] The flow control fluid 300 can have, but is not limited to, the following two structures. The first type is a cylindrical hollow structure with a locking block 302 fixed on its outer wall. The inner wall of the flow control cavity Q3 is provided with several sets of sliding grooves 103a. The locking block 302 is slidably inserted into the sliding groove 103a. The sliding cooperation between the locking block and the sliding groove not only restricts the circumferential rotation of the flow control fluid, ensuring that the cone is always coaxially aligned with the discharge pipe to avoid sealing failure, but also provides guidance for the up and down sliding of the flow control fluid, improving the smoothness of the adjustment action and avoiding adjustment errors caused by lateral offset.

[0072] The second type: The flow controller 300 has a spherical hollow structure, and its outer wall slides and fits against the wall of the flow controller cavity Q3. The spherical hollow structure has both lightweight and good buoyancy characteristics, and can quickly respond to changes in fluid pressure. The sliding fit design between its outer wall and the wall of the flow controller cavity can reduce the lateral impact force of fluid flow on the flow controller, further improving the stability of pressure regulation. At the same time, the spherical structure has better sealing performance and can effectively isolate the space between the discharge pipe 101 and the flow controller cavity Q3.

[0073] Furthermore, a measuring tube 101c is fixedly connected to the external discharge pipe 101. The measuring tube 101c is used to connect to a level gauge or pressure sensor to monitor parameters such as fluid level and pressure in the discharge pipe in real time, providing data support for the operation status of the device and facilitating timely adjustments by operators.

[0074] Furthermore, an observation window 103b is provided on the main shell 103 at the corresponding position of the flow control cavity Q3. The observation window 103b allows the operator to visually observe the floating state of the flow control fluid in the flow control cavity, promptly detect abnormalities, and ensure the reliable operation of the device.

[0075] Example 2

[0076] Reference Figures 1-12 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that this embodiment verifies the actual application effect of the geothermal reinjection wellhead pressure regulating device T in the above embodiment, and clarifies the pressure regulating capability and stability of the device under different reinjection volume conditions.

[0077] In this embodiment, the geothermal reinjection wellhead pressure regulating device T is made of stainless steel. A negative pressure gauge with a maximum measurement range of -0.1MPa is selected for negative pressure measurement, and an electromagnetic flowmeter is used to measure the reinjection volume.

[0078] Furthermore, a reinjection well was selected as the test well location. The test process was as follows: geothermal water was extracted from the production well, treated by an exhaust tank and a filter device, and then injected into the test reinjection well through a reinjection pipeline. The reinjection volume was monitored in real time by an electromagnetic flow meter, and a negative pressure gauge was used to detect the negative pressure state in the pipeline.

[0079] First, without this device installed, a negative pressure gauge was installed at the transverse reinjection pipeline near the reinjection wellhead. Reinjection tests were conducted at constant flow rates of 46.6 m³ / h and 64.7 m³ / h, respectively. The test results showed that the negative pressure gauge registered a reading immediately after the reinjection began, and the readings exceeded the -0.1 MPa range of the gauge, indicating a significant negative pressure at this location. Specific data are shown in Table 1 below. Table 1

[0080] Furthermore, the reinjection rate of the geothermal reinjection wellhead pressure regulating device T in this embodiment was determined. Specifically, a negative pressure gauge was installed at the same location as the initial measurement on the transverse reinjection pipeline. After starting the pump for reinjection, the device was checked for leaks, and the negative pressure gauge reading was 0 MPa. Within the reinjection rate range of less than 60 m³ / h, when the reinjection rate was adjusted down or up, the entire component of the fluid control unit 300 could automatically float up and down, the device operated normally, and the negative pressure gauge reading remained stable at 0 MPa.

[0081] Furthermore, when the recharge rate was increased to over 60 m³ / h, the recharge water overflowed from the top of the device, indicating that the maximum recharge rate that the device of this size and material can automatically adjust is approximately 60 m³ / h.

[0082] Furthermore, firstly check and adjust the smoothness of the fluid control 300 track to ensure that the fluid control 300 moves smoothly within the track. Then, start the pump for backfilling. The negative pressure gauge reading is 0 MPa, and the device is operating normally.

[0083] The geothermal water was continuously reinjected at a constant flow rate of 60.3 m³ / h for 8 hours. The negative pressure gauge reading remained stable at 0 MPa without any fluctuation, indicating that the geothermal water reinjection was normal.

[0084] When the reinjection rate was increased again, the reinjection water overflowed from the top of the device, consistent with the initial test results after installation. This verifies that the device can automatically adjust the maximum reinjection rate of approximately 60 m³ / h. The continuous reinjection test data are shown in Table 2 below: Table 2

[0085] Based on Tables 1 and 2, when this device is not installed, with a stable reinjection rate of 46.6 m³ / h and 64.7 m³ / h, the negative pressure readings at the pipeline near the wellhead all exceed the -0.1 MPa range, indicating that there is a significant negative pressure state and negative pressure pulsation at this location.

[0086] After installation, when the reinjection rate is stable at ≤60m³ / h, the device can operate normally continuously, and the negative pressure value in the pipeline is stable at 0MPa, effectively blocking negative pressure fluctuations and realizing automatic pressure regulation.

[0087] When the recharge rate is greater than 60 m³ / h, the recharge water overflows from the top of the device, indicating that the device of this size and material can automatically adjust the maximum recharge rate to approximately 60 m³ / h.

[0088] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A geothermal reinjection wellhead pressure regulating device (T), characterized in that: include, A sealed housing (100) has an outlet pipe (101) extending into the sealed housing (100) and forming an adjustment chamber (Q1) between it and the bottom cavity of the sealed housing (100). An inlet pipe (102) communicates with the adjustment chamber (Q1). The regulating cavity (Q1) is provided with several sets of channel plates (200) that block the flow path of geothermal fluid, and the several sets of channel plates (200) separate the regulating cavity (Q1). A control fluid (300) is also movably disposed inside the sealing housing (100) at the top of the regulating cavity (Q1), and the control fluid (300) isolates the discharge pipe (101) from the internal space of the sealing housing (100).

2. The geothermal reinjection wellhead pressure regulating device according to claim 1, characterized in that: The channel plate (200) includes a first voltage regulator plate (201), a second voltage regulator plate (202), a third voltage regulator plate (203), a fourth voltage regulator plate (204), and a flow-through component (205) arranged coaxially. The first voltage stabilizer (201), the second voltage stabilizer (202), the third voltage stabilizer (203), the fourth voltage stabilizer (204), and the flow-through component (205) are stacked sequentially from the bottom to the top of the regulating cavity (Q1); At least one set of first perforation group (201a), second perforation group (202a), third perforation group (203a) and fourth perforation group (204a) are respectively opened on the first voltage stabilizer plate (201), the second voltage stabilizer plate (202), the third voltage stabilizer plate (203a) and the fourth voltage stabilizer plate (204a).

3. The geothermal reinjection wellhead pressure regulating device according to claim 2, characterized in that: The first perforation group (201a) includes a plurality of first holes (201a-1) distributed in a circular pattern. If there is more than one first perforation group (201a), each first perforation group (201a) is set at the same center, and the circumferential trajectories corresponding to different first perforation groups (201a) are arranged at intervals in the radial direction.

4. The geothermal reinjection wellhead pressure regulating device according to claim 3, characterized in that: The second perforation group (202a) includes a plurality of second holes (202a-1) arranged in a circle, the third perforation group (203a) includes a plurality of third holes (203a-1) arranged in a circle, and the fourth perforation group (204a) includes a plurality of fourth holes (204a-1) arranged in a circle. The second hole (202a-1), the third hole (203a-1), and the fourth hole (204a-1) are arranged in the same way as the first hole (201a-1), and the holes in the two adjacent perforation groups are staggered.

5. The geothermal reinjection wellhead pressure regulating device according to any one of claims 2 to 4, characterized in that: A first stabilizing layer (A1) is formed between the first voltage regulator (201) and the second voltage regulator (202), a second stabilizing layer (A2) is formed between the second voltage regulator (202) and the third voltage regulator (203), a third stabilizing layer (A3) is formed between the third voltage regulator (203) and the fourth voltage regulator (204), and a fourth stabilizing layer (A4) is formed between the fourth voltage regulator (204) and the flow-through component (205). The first stabilizing layer (A1), the second stabilizing layer (A2), the third stabilizing layer (A3) and the fourth stabilizing layer (A4) have the same layer height.

6. The geothermal reinjection wellhead pressure regulating device according to claim 4, characterized in that: The top of the corresponding holes of the first hole (201a-1), the second hole (202a-1), the third hole (203a-1), and the fourth hole (204a-1) are respectively fixedly connected with the first flow stabilizer (201a-2), the second flow stabilizer (202a-2), the third flow stabilizer (203a-2), and the fourth flow stabilizer (204a-2); The first flow stabilizing tube (201a-2), the second flow stabilizing tube (202a-2), the third flow stabilizing tube (203a-2) and the fourth flow stabilizing tube (204a-2) are respectively symmetrically provided with a first flow stabilizing hole (K1), a second flow stabilizing hole (K2), a third flow stabilizing hole (K3) and a fourth flow stabilizing hole (K4) on their side walls. Among them, the straight line where the symmetrically opened flow stabilizing holes are located is the first direction line (X1), and the straight line where the flow stabilizing pipe where this group of flow stabilizing holes is located and the center of the pressure stabilizing plate are located is the second direction line (X2). The first direction line (X1) and the second direction line (X2) are perpendicular.

7. The geothermal reinjection wellhead pressure regulating device according to claim 6, characterized in that: The diameters of the second hole (202a-1), the third hole (203a-1), the fourth hole (204a-1), and the first hole (201a-1) gradually increase in sequence; The diameters of the second flow stabilizing orifice (K2), the third flow stabilizing orifice (K3), the fourth flow stabilizing orifice (K4), and the first flow stabilizing orifice (K1) gradually increase in sequence.

8. The geothermal reinjection wellhead pressure regulating device according to claim 6 or 7, characterized in that: The flow-through component (205) has several sets of circumferentially distributed flow-through holes (205a), the diameter of which is larger than the diameter of the fourth flow-stabilizing hole (K4) on the fourth flow-stabilizing pipe (204a-2).

9. The geothermal reinjection wellhead pressure regulating device according to claim 8, characterized in that: The sealed housing (100) includes a main housing (103) and a sealing cap (104) and an interface flange (105) that are sealed and fixed at its top and bottom ends. The main housing (103) has an accommodating space inside. The discharge pipe (101) is fixedly connected to the middle of the interface flange (105), with one end extending into the main body shell (103). The first pressure stabilizing plate (201), the second pressure stabilizing plate (202), the third pressure stabilizing plate (203), the fourth pressure stabilizing plate (204), and the flow-through component (205) are fixedly sleeved on the discharge pipe (101).

10. The geothermal reinjection wellhead pressure regulating device according to claim 9, characterized in that: The top of the discharge pipe (101) located inside the main shell (103) is fixed with several sets of negative pressure pads (101a) in a circular shape, and a negative pressure channel (101b) is formed between the negative pressure pads (101a). The main shell (103) between the negative pressure pad (101a) and the interface flange (105) forms the regulating cavity (Q1). A discharge cavity (Q2) is formed between the first pressure stabilizing plate (201) and the interface flange (105), and the discharge pipe (102) is connected to the discharge cavity (Q2).

11. The geothermal reinjection wellhead pressure regulating device according to claim 10, characterized in that: A flow control cavity (Q3) is formed between the negative pressure pad (101a) and the sealing cover (104), and the flow control fluid (300) is slidably disposed within the flow control cavity (Q3); A cone-shaped body (301) is fixedly connected to the middle of the bottom end of the fluid control device (300), and the cone-shaped body (301) can be inserted into the discharge pipe (101); When the cone (301) is about to detach from the discharge pipe (101), the fluid control (300) comes into contact with the sealing cap (104).

12. The geothermal reinjection wellhead pressure regulating device according to claim 11, characterized in that: The flow control fluid (300) is a cylindrical hollow structure with a locking block (302) fixed on its outer wall. The flow control cavity (Q3) has several sets of sliding grooves (103a) on its circumferential inner wall, and the locking block (302) is slidably inserted into the sliding groove (103a).

13. The geothermal reinjection wellhead pressure regulating device according to claim 11, characterized in that: The flow control fluid (300) is a spherical hollow structure, and its outer wall is slidably attached to the cavity wall of the flow control cavity (Q3).

14. The geothermal reinjection wellhead pressure regulating device according to claim 12 or 13, characterized in that: A measuring tube (101c) is connected and fixed to the discharge pipe (101) located on the outside, and an observation window (103b) is also provided on the main body shell (103) at the corresponding position of the flow control cavity (Q3).

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