Wellhead device special for rock-soil energy storage heat exchange hole

Abstract

The utility model discloses a special wellhead device for rock-soil energy storage heat exchange holes, which relates to the technical field of wellhead devices and comprises a sleeve and an inner pipe, the top of the sleeve is connected with a lower flange, the bottom of the outer wall of the inner pipe is connected with an upper flange, and the upper flange is connected with the lower flange through a bolt. A water inlet head and a temperature measuring head are connected to the outer wall of the sleeve, a connector is connected to the inner wall of the temperature measuring head, an extrusion joint is connected to the interior of the connector, temperature measuring lines are arranged in the extrusion joint and the connector in a sleeved mode, and an end cover is connected to one end of the extrusion joint. According to the wellhead device special for the rock-soil energy storage heat exchange hole, installation and later maintenance of the temperature measuring line are facilitated, the geothermal condition in a geothermal well can be detected in real time through the temperature measuring line, and meanwhile the problems such as pipeline leakage and blockage or abnormal flowing of geothermal fluid in a well way can be detected according to the temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of wellhead devices, and more specifically to a special wellhead device for rock and soil energy storage and heat exchange holes. Background Art

[0002] A heat exchange geothermal well is a system that uses underground heat energy for heat exchange. It is mainly used for the development and utilization of geothermal energy, especially in the fields of heating, hot water supply and power generation. This type of geothermal well is designed to extract heat from underground reservoirs efficiently and sustainably while reducing the impact on the environment.

[0003] In order to conduct long-term monitoring and research on the heat exchange efficiency of geothermal wells and the thermal properties of the formation, a temperature measuring optical cable will be installed between the casing and the inner tube. For example, the Chinese patent with application number 202322941765.2 discloses a wellhead device for medium-deep geothermal buried pipe heat exchange wells, and the temperature measuring optical cable crossing mechanism includes a ferrule connector body, a ferrule assembly and a compression nut. The wellhead device for medium-deep geothermal buried pipe heat exchange wells achieves the sealing effect of the temperature measuring cable by squeezing the first ferrule and the second ferrule by the compression nut. During the installation process, the cable will be slightly deformed, but the slight physical deformation may change the resistance value of the cable, thereby affecting the accuracy of the temperature reading. For high-precision temperature measurement, even a very small error may lead to unreliable measurement results. At the same time, the temperature measuring cable must be slightly smaller than the ferrule connector body, the first ferrule and the second ferrule before it can be used. When the gap between the two is too large, the sealing and fixing ability will fail.

[0004] Therefore, it is necessary to propose a special wellhead device for geotechnical energy storage heat exchange holes to solve the above problems. Utility Model Content

[0005] In view of the above problems, the utility model provides a special wellhead device for rock and soil energy storage heat exchange holes; it facilitates the installation and maintenance of the temperature measuring line, and at the same time improves the stability of the temperature measuring line during use through a double sealing and fixing structure.

[0006] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0007] A special wellhead device for geotechnical energy storage heat exchange holes, comprising a casing and an inner tube, the top of the casing is connected with a lower flange, the bottom of the outer wall of the inner tube is connected with an upper flange, the upper flange and the lower flange are connected by bolts, the outer wall of the casing is connected with a water inlet head and a temperature measuring head, the inner wall of the temperature measuring head is connected with a connector, the interior of the connector is connected with an extrusion joint, the extrusion joint and the inner sleeve of the connector are provided with a temperature measuring line, and one end of the extrusion joint is connected with an end cap;

[0008] The connector includes a fixing plate, an outer ring and an inner ring. The inner ring is sleeved inside the outer ring. One ends of the outer ring and the inner ring are connected to the fixing plate. The inner circumferential surface of the inner ring is provided with an internal thread and a groove. The groove is located at the end far from the fixing plate. A first sealing ring is sleeved in the groove. The inner circumferential surface of the first sealing ring is in contact with the temperature measuring wire.

[0009] One end of the extrusion joint is installed on the inner circumferential surface of the inner ring by a thread. The other end of the extrusion joint is threadedly connected to the end cover. An extrusion part is provided on the inner circumferential surface of the end cover. A second sealing ring is provided between the extrusion joint and the extrusion part. The inner circumferential surface of the second sealing ring is in contact with the temperature measuring wire.

[0010] Preferably, a fixing ring is connected to the end of the extrusion joint located inside the inner ring. A contact plate is rotatably connected to the fixing ring. The contact plate is in contact with the first sealing ring.

[0011] Preferably, an extrusion cavity is provided inside the first sealing ring. Support rings are connected to both sides of the extrusion cavity. The inner circumferential surface of the support ring is smaller than the inner circumferential surface of the extrusion cavity.

[0012] Preferably, an extrusion cavity and an extension cavity are formed inside the second sealing ring. The extension cavity is located on the inner circumferential surface of the extrusion cavity. The two sides of the extrusion cavity and the thin wall on the side close to the axis of the extension cavity are provided.

[0013] Preferably, the bottom of the casing is connected to a heat exchange casing arranged in a geothermal well by a thread. A plastic-steel adapter is connected to the water inlet head.

[0014] Preferably, plastic-steel adapters are connected to the upper and lower ends of the inner pipe. The plastic-steel adapter at the bottom is connected to the inner pipe arranged in the geothermal well.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] 1. By providing a separate temperature measuring head interface on the casing, the present device facilitates the installation and later maintenance of the temperature measuring wire. Through the temperature measuring wire, the geothermal situation in the geothermal well can be detected in real time, and at the same time, problems in the wellbore, such as pipeline leakage, blockage or abnormal flow of geothermal fluid, can be detected according to the temperature.

[0017] 2. By providing a double-layer sealing structure, the present device can achieve double fixing and sealing capabilities, avoiding the leakage of heat exchange medium and the shaking of the temperature measuring wire. At the same time, extrusion cavities are provided inside the first sealing ring and the second sealing ring. After being extruded, they can generate large deformations to adapt to temperature measuring wires of different diameters, improving the scope of use. Description of the Drawings

[0018] Figure 1Schematic diagram of the sleeve and inner tube structures in the present utility model;

[0019] Figure 2 Exploded view of the sleeve and inner tube structures in the present utility model;

[0020] Figure 3 Exploded view of the connector and extrusion joint structures in the present utility model;

[0021] Figure 4 Cross-sectional view of the connector and extrusion joint structures in the present utility model;

[0022] Figure 5 Cross-sectional view of the first sealing ring structure in the present utility model;

[0023] Figure 6 Cross-sectional view of the second sealing ring structure in the present utility model.

[0024] Reference numerals:

[0025] 101, sleeve; 102, inner tube; 103, water inlet head; 104, temperature measuring head; 105, connector; 106, extrusion joint; 107, temperature measuring wire; 108, end cap; 109, fixing plate; 110, outer ring; 111, inner ring; 112, first sealing ring; 113, extrusion part; 114, second sealing ring; 115, fixing ring; 116, contact plate; 117, extrusion cavity; 118, support ring; 119, extension cavity; 120, plastic-steel adapter. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] Please refer to Figure 1-6, including a casing 101 and an inner pipe 102. The inner pipe 102 is connected to the inner pipe 102 located in the heat exchange well through a plastic-steel adapter 120 at the bottom. The bottom of the casing 101 is connected to the casing 101 located in the heat exchange well. A lower flange is connected to the top of the casing 101, and an upper flange is connected to the bottom of the outer wall of the inner pipe 102. The upper flange and the lower flange are connected by bolts. An inlet head 103 and a temperature measuring head 104 are connected to the outer wall of the casing 101. The inlet head 103 is connected to the inlet pipe through the plastic-steel adapter 120. A connector 105 is connected to the inner wall of the temperature measuring head 104. The connector 105 is used to fix the extrusion joint 106 to the temperature measuring head 104. The connector 105 is installed on the temperature measuring head 104 through the thread of the outer ring 110. An extrusion joint 106 is connected inside the connector 105. A temperature measuring wire 107 is arranged inside the extrusion joint 106 and the inner sleeve of the connector 105. The temperature measuring wire 107 is a cable extending into the geothermal well casing 101 for temperature detection. One end of the extrusion joint 106 is connected to an end cap 108;

[0028] The following provides a structure that facilitates the fixing and sealing of the temperature measuring wire 107: Refer to Figure 4 and Figure 5 , the connector 105 includes a fixing plate 109, an outer ring 110 and an inner ring 111. The inner ring 111 is sleeved inside the outer ring 110. The outer ring 110 is used to connect to the temperature measuring head 104, and the inner ring 111 inside is used for threaded connection with the extrusion joint 106. One ends of the outer ring 110 and the inner ring 111 are connected to the fixing plate 109. The middle parts of the fixing plate 109 and the extrusion joint 106 are set to be hexagonal, which is convenient for installation with a hex wrench. The inner ring surface of the inner ring 111 is provided with internal threads and a groove. The groove is located at the end far from the fixing plate 109. A first sealing ring 112 is sleeved in the groove. The groove is used to place the first sealing ring 112. The first sealing ring 112 and the second sealing ring 114 are made of rubber. The inner ring surface of the first sealing ring 112 is in contact with the temperature measuring wire 107. When the extrusion joint 106 is installed into the inner ring 111, the contact plate 116 at one end of the extrusion joint 106 will come into contact with the side wall of the first sealing ring 112, thereby extruding it. Since the outer ring surface and both sides of the first sealing ring 112 are restricted, it can only expand towards the inner ring surface, thereby extruding the internal temperature measuring wire 107 to play a role in sealing and fixing;

[0029] The following provides a structure for secondary sealing and fixing: Refer to Figure 4 and Figure 6, one end of the extrusion joint 106 is installed on the inner ring surface of the inner ring 111 by threads, the other end of the extrusion joint 106 is threadedly connected to the end cover 108, and an extrusion portion 113 is provided on the inner ring surface of the end cover 108. When the end cover 108 is installed on the extrusion joint 106, the extrusion portion 113 will approach one end of the extrusion joint 106, thereby squeezing the second sealing ring 114 therebetween. A second sealing ring 114 is provided between the extrusion joint 106 and the extrusion portion 113, and the inner ring surface of the second sealing ring 114 is in contact with the temperature measuring wire 107. When the extrusion portion 113 and one end of the extrusion joint 106 approach each other, refer to Figure 6 , the extrusion cavity 117 near the outer ring will be squeezed, and then the internal air flow will move towards the inner ring surface of the thin wall through the extension cavity 119, so that the inner ring surface will come into contact with the temperature measuring wire 107, thereby playing a role in sealing and fixing the cable.

[0030] Specifically, refer to Figure 4 , a fixing ring 115 is connected to one end of the extrusion joint 106 located inside the inner ring 111, and the contact plate 116 can rotate around the fixing ring 115. When the extrusion joint 106 is installed into the inner ring 111, the contact plate 116 will come into contact with the side wall of the first sealing ring 112. When the extrusion joint 106 rotates, it will not affect the connection between the first sealing ring 112 and the contact plate 116, avoiding the situation where the extrusion joint 106 generates rotational friction on the outer wall of the first sealing ring 112. The contact plate 116 is rotatably connected to the fixing ring 115, and the contact plate 116 is in contact with the first sealing ring 112.

[0031] Specifically, refer to Figure 5 , an extrusion cavity 117 is provided inside the first sealing ring 112, and support rings 118 are connected to both sides of the extrusion cavity 117. The support rings 118 are made of rigid materials and play a supporting role to avoid the situation where the first sealing ring 112 is deformed due to extrusion. When the first sealing ring 112 is squeezed, the support rings 118 on both sides will move towards the middle, so that the internal gas can move towards the inner ring surface and come into contact with the temperature measuring wire 107. The inner ring surface of the support ring 118 is smaller than the inner ring surface of the extrusion cavity 117.

[0032] Specifically, refer to Figure 6 , an extrusion cavity 117 and an extension cavity 119 are provided inside the second sealing ring 114. When the extrusion cavity 117 is squeezed, the internal air flow will enter the extension cavity 119, so that the thinner side of the inner wall of the extension cavity 119 expands outward. The extension cavity 119 is located on the inner ring surface of the extrusion cavity 117, and both sides of the extrusion cavity 117 and the thin wall on the side of the extension cavity 119 close to the axis are provided.

[0033] Specifically, refer to Figure 1 and Figure 2, the bottom of the casing 101 is connected to the heat exchange casing 101 disposed in the geothermal well through threads. A plastic-steel adapter 120 is connected to the water inlet head 103, and the plastic-steel adapter 120 is used for connecting different pipes.

[0034] Specifically, referring to Figure 1 and Figure 2 , plastic-steel adapters 120 are connected to the upper and lower ends of the inner pipe 102. The plastic-steel adapter 120 at the top is connected to the geothermal water outlet pipe, and the plastic-steel adapter 120 at the bottom is connected to the inner pipe 102 disposed in the geothermal well.

[0035] In this embodiment, the inner pipe 102 and the casing 101 are connected through upper and lower flanges and fixed with bolts. The water inlet head 103 is connected to the water supply pipe through the plastic-steel adapter 120. When installing the temperature measurement wire 107, the temperature measurement wire 107 is sequentially passed through the end cap 108, the second sealing ring 114, the extrusion joint 106 and the connector 105. Then the connector 105 is installed on the temperature measurement head 104 through threads, and then the extrusion joint 106 is installed on the connector 105 through threads. At this time, the internal first sealing ring 112 is squeezed to fix the temperature measurement wire 107 and play a sealing role. Then the end cap 108 is installed on the extrusion joint 106 through threads. At this time, the extrusion part 113 will squeeze the second sealing ring 114, so that the second sealing ring 114 plays a role of re-sealing and fixing.

[0036] The above-mentioned implementation manner is only the preferred implementation manner of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention belong to the protection scope required by the present invention.

Claims

1. Special wellhead device for geotechnical energy storage heat exchange holes, comprising a casing (101) and an inner pipe (102). A lower flange is connected to the top of the casing (101), and an upper flange is connected to the bottom of the outer wall of the inner pipe (102). The upper flange and the lower flange are connected by bolts, and it is characterized in that: An inlet head (103) and a temperature measuring head (104) are connected to the outer wall of the casing (101). A connecting head (105) is connected to the inner wall of the temperature measuring head (104). An extrusion joint (106) is connected inside the connecting head (105). A temperature measuring wire (107) is arranged inside the extrusion joint (106) and the connecting head (105). One end of the extrusion joint (106) is connected to an end cap (108). The connecting head (105) includes a fixing plate (109), an outer ring (110) and an inner ring (111). The inner ring (111) is sleeved inside the outer ring (110). One ends of the outer ring (110) and the inner ring (111) are connected to the fixing plate (109). The inner ring surface of the inner ring (111) is provided with internal threads and a groove. The groove is located at the end far from the fixing plate (109). A first sealing ring (112) is sleeved inside the groove. The inner ring surface of the first sealing ring (112) is in contact with the temperature measuring wire (107). One end of the extrusion joint (106) is installed on the inner ring surface of the inner ring (111) by threads. The other end of the extrusion joint (106) is threadedly connected to the end cap (108). An extrusion part (113) is arranged on the inner ring surface of the end cap (108). A second sealing ring (114) is arranged between the extrusion joint (106) and the extrusion part (113). The inner ring surface of the second sealing ring (114) is in contact with the temperature measuring wire (107).

2. The dedicated wellhead device for geotechnical energy storage heat exchange holes according to claim 1, characterized in that: One end of the extrusion joint (106) located inside the inner ring (111) is connected to a fixing ring (115). A contact plate (116) is rotatably connected to the fixing ring (115). The contact plate (116) is in contact with the first sealing ring (112).

3. The dedicated wellhead device for geotechnical energy storage heat exchange holes according to claim 2, characterized in that: An extrusion cavity (117) is arranged inside the first sealing ring (112). Support rings (118) are connected to both sides of the extrusion cavity (117). The inner ring surface of the support ring (118) is smaller than the inner ring surface of the extrusion cavity (117).

4. The dedicated wellhead device for geotechnical energy storage heat exchange holes according to claim 1, characterized in that: An extrusion cavity (117) and an extension cavity (119) are formed inside the second sealing ring (114). The extension cavity (119) is located on the inner ring surface of the extrusion cavity (117). The two sides of the extrusion cavity (117) and the thin wall on the side close to the axis of the extension cavity (119) are provided.

5. The dedicated wellhead device for geotechnical energy storage heat exchange holes according to claim 1, characterized in that: The bottom of the casing (101) is connected to a heat exchange casing (101) arranged in a geothermal well by threads. A plastic-steel conversion head (120) is connected to the inlet head (103).

6. The dedicated wellhead device for geotechnical energy storage heat exchange holes according to claim 5, characterized in that: Plastic-steel conversion heads (120) are connected to the upper and lower ends of the inner pipe (102). The plastic-steel conversion head (120) at the bottom is connected to the inner pipe (102) arranged in the geothermal well.

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