Geothermal water recharge wellhead sealing device

Abstract

The utility model discloses a geothermal water recharge wellhead sealing device, and particularly relates to the technical field of geothermal water recharge, which comprises a sleeve, a plurality of inclined holes are arranged on the outer surface of the sleeve, limit grooves are further arranged on the inner walls of the inclined holes, and ground inserting rods are slidably mounted on the inner walls of the inclined holes. Two limiting blocks matched with the limiting grooves are fixed to the outer surface of the ground inserting rod, a flow guide plate is further fixed to the end, close to the center shaft of the sleeve, of the ground inserting rod, and a pressure relief assembly is arranged at the upper end of the sleeve. According to the geothermal water recharge wellhead sealing device, the design that the ground inserting rod and the flow guide plate are matched with each other is adopted, the inclined hole inclines upwards, so that the ground inserting rod can be obliquely and upwards inserted into the ground, and when the ground inserting rod is obliquely and upwards inserted into the ground, the ground inserting rod can be provided with a plurality of barbs relative to the outer surface of the sleeve; therefore, the casing pipe cannot be easily pushed out by the pressure of the recharge wellhead, and the device is more stable in use.

Description

Technical Field

[0001] The utility model relates to the technical field of geothermal water recharge, in particular to a geothermal water recharge wellhead sealing device. Background Art

[0002] Recharge wells refer to wells that inject and dispose of corrosive or harmful liquids. Generally, abandoned old oil wells are used to treat oily brine or raw sewage. The disadvantage is that it will pollute groundwater and cause underground soil slippage.

[0003] Chinese patent document CN213775301 U discloses a geothermal water reinjection wellhead sealing device, including a foundation pit, a casing inserted and connected inside the foundation pit, a manhole cover fixedly installed on the top of the casing, a plurality of first through holes are opened on the sides of the top of the manhole cover, bolts are inserted and connected inside the plurality of first through holes, and the plurality of bolts are threadedly connected to the casing through the manhole cover. The utility model provides a geothermal water reinjection wellhead sealing device, an annular placement groove is opened on the side of the bottom end of the manhole cover, a sealing ring is fixedly connected inside the annular placement groove, the sealing ring can increase the sealing strength of the manhole cover, prevent the loss of reinjection liquid from causing pollution to the surrounding environment, and improve the sealing effect of the manhole cover connection, a plurality of oil injection holes are opened on the sides of the casing, and the plurality of oil injection holes can be used to inject butter into the interior of the manhole cover to prevent rust at the connection, so that the reinjection well cover is easy to open when it is used again, thereby ensuring the normal operation of the reinjection well.

[0004] However, the device is not convenient to be fixed in the recharge well during actual use. When the pressure in the recharge well is too high, the device will be flushed out, affecting the normal use of the device. Utility Model Content

[0005] The main purpose of the utility model is to provide a geothermal water reinjection wellhead sealing device, which can effectively solve the problem that when the pressure in the reinjection well is too high, the device will be flushed out, affecting the normal use of the device.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A geothermal water reinjection wellhead sealing device includes a casing, wherein the outer surface of the casing is provided with a plurality of inclined holes, the inner wall of the inclined hole is also provided with a limiting groove, a ground rod is slidably mounted on the inner wall of the inclined hole, two limiting blocks adapted to the limiting groove are fixed on the outer surface of the ground rod, a guide plate is also fixed to the end of the ground rod close to the central axis of the casing, and a pressure relief assembly is provided at the upper end of the casing.

[0008] Preferably, the inclined hole is arranged obliquely upward.

[0009] Preferably, the pressure relief assembly includes a pressure relief pipe, a piston is slidably mounted on the inner wall of the pressure relief pipe, a return spring is fixed to the upper end of the piston, a support plate is fixed to the upper end of the return spring, an adjusting screw is rotatably connected to the pressure relief pipe thread at the upper end of the support plate, and a plurality of pressure relief holes are opened in a ring array on the outer surface of the pressure relief pipe.

[0010] Preferably, the piston fits tightly against the inner wall of the pressure relief pipe.

[0011] Preferably, the pressure relief pipe and the sleeve are connected via a flange, and a sealing gasket is provided at the connection between the two flanges.

[0012] Preferably, the pressure relief hole is arranged to be inclined downward.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The utility model adopts a design in which the ground insertion rod and the guide plate cooperate with each other. The inclined hole is set upward, so that the ground insertion rod can also be inserted into the ground at an angle. When the ground insertion rod is inserted into the ground at an angle, it can have several barbs relative to the outer surface of the casing, so that the casing will not be easily pushed out by the pressure of the recharge wellhead, making the device more stable when used.

[0015] 2. The utility model adopts the design of a pressure relief component. Through the mutual cooperation between the support plate and the adjusting screw, the device can adjust the elasticity of the reset spring when in use, thereby allowing the device to adjust the pressure relief pressure of the pressure relief component when in use, increasing the applicability of the device when in use, and through the downward slanted setting of multiple pressure relief holes, it can prevent dust or impurities from entering the pressure relief pipe through the pressure relief holes during normal use of the device, making the device more stable when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a cross-sectional view of the sleeve of the utility model;

[0018] Figure 3 For the utility model Figure 2 Enlarged view of point A in the middle;

[0019] Figure 4 It is a plan view of the pressure relief assembly of the present utility model;

[0020] Figure 5 It is a partial structural schematic diagram of the device of the utility model when in use.

[0021] In the figure: 1. sleeve; 2. inclined hole; 3. limit groove; 4. ground plug rod; 5. limit block; 6. guide plate; 7. pressure relief assembly; 71. pressure relief pipe; 72. piston; 73. return spring; 74. support plate; 75. adjusting screw; 76. pressure relief hole. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0023] Example 1

[0024] like Figure 1 - Figure 3 As shown, a geothermal water reinjection wellhead sealing device includes a casing 1, a plurality of inclined holes 2 are opened on the outer surface of the casing 1, the inclined holes 2 are arranged obliquely upward, and a limiting groove 3 is further opened on the inner wall of the inclined hole 2. A ground plug rod 4 is slidably installed on the inner wall of the inclined hole 2, and two limiting blocks 5 adapted to the limiting groove 3 are fixed on the outer surface of the ground plug rod 4, wherein the limiting groove 3 is used to limit the limiting block 5, so that the ground plug rod 4 can only move along the axis of the inclined hole 2 when in use and cannot rotate. At the same time, due to the upward inclined design of the inclined hole 2, the ground plug rod 4 also moves obliquely upward, thereby being inserted into the ground (such as Figure 5 As shown), the device is not likely to slip out of the recharge port when in use. (When the ground rod 4 is inserted into the ground at an angle upward, it can have several barbs relative to the outer surface of the casing 1. Compared with the horizontal setting of the ground rod 4, the upward setting has greater resistance, so that the casing 1 will not be easily pushed out by the pressure of the recharge wellhead, making the device more stable when in use).

[0025] In addition, a guide plate 6 is fixed to one end of the ground rod 4 close to the central axis of the casing 1. Due to the inclined design of the ground rod 4, the guide plate 6 is also inclined relative to the casing 1. Figure 2 and Figure 5 It can be seen that when the liquid in the pipeline is discharged from the sleeve 1, the liquid will push the multiple guide plates 6 to move to the side away from the central axis of the sleeve 1, so that the multiple ground rods 4 can be inserted into the ground a longer distance (the figure only shows the working principle. In actual use, the wall thickness of the sleeve 1 and the length of the ground rod 4 can be adjusted according to different needs. In order to prevent the ground rod 4 from falling off from the inclined hole 2 during transportation of the equipment, the ground rod 4 can be limited by a clamp or a limit ring. No more details will be given in this embodiment). A pressure relief assembly 7 is provided at the upper end of the sleeve 1.

[0026] The specific implementation of this embodiment is as follows: when the device is in use, the casing 1 is placed in the recharge wellhead, and then grouting is performed into the recharge well through the casing 1. During grouting, the slurry can impact the multiple guide plates 6, causing the multiple guide plates 6 to move toward the side close to the central axis of the casing 1. When there is too much liquid in the recharge well and it needs to be discharged from the casing 1, the liquid will push the multiple guide plates 6 to move toward the side away from the central axis of the casing 1, thereby allowing the multiple ground rods 4 to be inserted into the ground for a longer distance. When the pressure in the recharge well is too high when the device is in use, the casing 1 will not be easily pushed out of the recharge wellhead by the pressure, making the device more stable when in use.

[0027] Example 2

[0028] This embodiment further improves the pressure relief component 7 on the basis of the first embodiment, so that the device can adjust the pressure relief pressure when in use, thereby increasing the applicability of the device when in use.

[0029] like Figure 4 As shown, the pressure relief assembly 7 includes a pressure relief pipe 71, which is connected to the casing 1 through a flange. A sealing gasket is provided at the connection between the two flanges. The sealing gasket can prevent leakage at the connection between the pressure relief pipe 71 and the casing 1, making the device more stable when used. A piston 72 is slidably installed on the inner wall of the pressure relief pipe 71. The piston 72 fits tightly against the inner wall of the pressure relief pipe 71, so that the liquid in the casing 1 can push the piston 72 to move upward. A return spring 73 is fixed to the upper end of the piston 72, and a support plate 74 is fixed to the upper end of the return spring 73. An adjusting screw 75 threadedly connected to the pressure relief pipe 71 is rotatably provided on the upper end of the support plate 74. A plurality of pressure relief holes 76 are provided in an annular array on the outer surface of the pressure relief pipe 71. The pressure relief holes 76 are arranged obliquely downward, so that when the liquid pressure in the recharge well is too high, the liquid is sprayed downward through the pressure relief holes 76. Compared with direct upward spraying, the spraying area can be reduced, which is convenient for cleaning. It can also prevent dust or impurities from entering the pressure relief pipe 71 through the pressure relief holes 76 during normal use, thereby affecting the normal operation of the device.

[0030] In addition, since the height of the inner surface of the pressure relief tube 71 is a fixed value, the return spring 73 is in its longest state when the piston 72 is at the bottom, and since the adjusting screw 75 is threadedly connected to the pressure relief tube 71 and the adjusting screw 75 is rotatably connected to the support plate 74, the adjusting screw 75 can drive the support plate 74 to move upward or downward when it rotates, thereby allowing the support plate 74 to adjust the elasticity of the return spring 73, and further allowing the pressure relief pressure of the pressure relief assembly 7 to be adjusted (when the pressure in the sleeve 1 is too high, the liquid in the sleeve 1 will push the piston 72 to move upward, wherein the speed and distance of the upward movement of the piston 72 are related to the elasticity of the return spring 73 and the pressure of the liquid in the sleeve 1).

[0031] When the support plate 74 moves downward, the return spring 73 is compressed, thereby increasing the thrust of the return spring 73 on the piston 72, so that the piston 72 can be pushed up only when the liquid pressure in the sleeve 1 is relatively high. When the support plate 74 moves upward, the return spring 73 is released, thereby reducing the thrust of the return spring 73 on the piston 72, so that the piston 72 can be pushed up only when the liquid pressure in the sleeve 1 is relatively low. By adjusting the elastic design of the return spring 73, the device can adjust the pressure relief pressure of the pressure relief assembly 7 when in use, thereby increasing the applicability of the device when in use.

[0032] The specific implementation of this embodiment is as follows: when the device is in use, the adjusting screw 75 is rotated according to different reinjection wellheads, and the support plate 74 is moved upward or downward by rotating the adjusting screw 75, so that the support plate 74 compresses or releases the reset spring 73, thereby adjusting the pressure relief pressure of the pressure relief assembly 7. When the pressure of the liquid in the casing 1 increases, it will push the piston 72 to move upward. When the piston 72 moves to above the pressure relief hole 76, the liquid will be discharged through the pressure relief hole 76, thereby achieving the purpose of pressure relief.

[0033] It should be noted that the specific installation methods and control methods of the ground rod 4, the piston 72 and the return spring 73 in the present invention are all conventional designs and will not be elaborated in detail in the present invention.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A geothermal water recharge wellhead sealing device, comprising a casing (1), characterized in that: The outer surface of the sleeve (1) is provided with a plurality of inclined holes (2), the inner wall of the inclined hole (2) is also provided with a limiting groove (3), the inner wall of the inclined hole (2) is slidably mounted with a ground plug (4), the outer surface of the ground plug (4) is fixed with two limiting blocks (5) adapted to the limiting groove (3), the end of the ground plug (4) close to the central axis of the sleeve (1) is also fixed with a guide plate (6), and the upper end of the sleeve (1) is provided with a pressure relief assembly (7).

2. The geothermal water reinjection wellhead sealing device according to claim 1, characterized in that: The inclined hole (2) is arranged obliquely upward.

3. The geothermal water reinjection wellhead sealing device according to claim 1, characterized in that: The pressure relief assembly (7) includes a pressure relief pipe (71), a piston (72) is slidably mounted on the inner wall of the pressure relief pipe (71), a return spring (73) is fixed to the upper end of the piston (72), a support plate (74) is fixed to the upper end of the return spring (73), an adjusting screw (75) threadedly connected to the pressure relief pipe (71) is rotatably mounted on the upper end of the support plate (74), and a plurality of pressure relief holes (76) are provided in an annular array on the outer surface of the pressure relief pipe (71).

4. The geothermal water reinjection wellhead sealing device according to claim 3, characterized in that: The piston (72) is tightly fitted to the inner wall of the pressure relief pipe (71).

5. The geothermal water reinjection wellhead sealing device according to claim 3, characterized in that: The pressure relief pipe (71) and the sleeve (1) are connected via a flange, and a sealing gasket is provided at the connection between the two flanges.

6. The geothermal water reinjection wellhead sealing device according to claim 3, characterized in that: The pressure relief hole (76) is arranged to be inclined downward.

Images