Modular geothermal well bore wall support structure

Abstract

The utility model belongs to the ground source heat well construction technical field, concretely relates to a modularization ground source heat well well wall support structure, including a plurality of casing, the casing lateral wall left and right symmetry is from top to bottom and is set with a plurality of recess, all be provided with support subassembly in the recess, a plurality of casing are mutually butted, the casing lateral wall all are provided with pumping unit. Support subassembly includes movable plate that is movably connected in recess lateral wall near the middle part, the movable plate lateral wall is provided with locking piece, the recess lateral wall is located the bolt that is screwed on movable plate upside. The locking piece includes the stud that is screwed in movable plate lateral wall, the recess lateral wall is set up two threaded holes away from movable plate, the stud is matched with threaded hole. The utility model can be fast with the casing under the position of a section of position after drilling and digging certain depth, prevent the well wall from being affected by the flow or the soil quality and cause the collapse, effectively support the well wall.

Description

Technical Field

[0001] This utility model belongs to the field of geothermal well construction technology, specifically relating to a modular geothermal well wall support structure. Background Technology

[0002] Wellbore support for geothermal wells is a key measure to prevent wellbore collapse and deformation during drilling or after well completion, ensure well structure stability, and guarantee the long-term effective operation of the heat exchange system.

[0003] Most existing geothermal wells lack wellbore support technology during drilling. Some drilling operations use metal sleeves for support, but the sleeves are often placed after drilling to a certain depth. When the drill bit is drilling downwards, the wellbore without sleeves is easily affected by water flow, causing the soil to loosen and collapse, which affects the subsequent movement of the sleeves. This makes it difficult to move the sleeves down quickly, which is not conducive to practical construction applications. Utility Model Content

[0004] The purpose of this invention is to provide a modular geothermal well support structure that can quickly move the casing down a certain position after drilling to a certain depth, preventing the well wall from collapsing due to water flow or soil conditions, and effectively supporting the well wall.

[0005] The specific technical solution adopted by this utility model is as follows:

[0006] A modular geothermal well support structure includes multiple casings. The sidewalls of the casings are symmetrically provided with multiple grooves from top to bottom. Each groove is provided with a support component. The multiple casings are connected to each other. Each sidewall of the casing is provided with a pumping component.

[0007] Furthermore, the support assembly includes a movable plate movably connected to the sidewall of the groove near the middle, the sidewall of the movable plate being provided with a locking element, and the sidewall of the groove being threadedly connected to the upper side of the movable plate with a bolt.

[0008] Furthermore, the locking component includes a stud threaded to the side wall of the movable plate, and two threaded holes are provided on the side wall of the groove away from the movable plate, with the stud matching the threaded holes.

[0009] Furthermore, a threaded ring is fixedly connected to the bottom end face of the sleeve, and a threaded groove is opened on the top end face of the sleeve, with the threaded ring and the threaded groove being threadedly connected.

[0010] Furthermore, the pumping assembly includes an annular groove formed inside the casing, the annular groove having multiple flow channels on its sidewall, the bottom of the flow channels passing through a threaded ring, the top of the flow channels passing through a threaded groove, the sidewall of the flow channels having multiple water inlet holes, and a connector fixedly connected to the uppermost sidewall of the casing, the connector communicating with the annular groove.

[0011] Furthermore, the water inlet hole has a submerged hole structure, and the sidewalls of the water inlet hole are all equipped with filter screens.

[0012] Furthermore, when the sleeves on both sides are in the docked state, the flow channels on both sides are connected.

[0013] The technical effects achieved by this utility model are as follows:

[0014] This utility model discloses a modular geothermal well support structure. Through the cooperation of casing, groove, movable plate, locking parts, etc., the casing adopts a modular design. When drilling to a certain depth, the casing can be spliced ​​down one by one. After drilling to a certain depth, the downsliding depth of the casing can be controlled, shortening the distance between the drill bit and the casing, preventing well wall collapse, and ensuring stable support. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present invention;

[0016] Figure 2 This is a cross-sectional structural schematic diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of a single sleeve of this utility model;

[0018] Figure 4 This is a structural schematic diagram of the movable plate of this utility model in its unfolded state;

[0019] Figure 5 This is a structural diagram of the movable panel of this utility model in its stored state;

[0020] Figure 6 This is a utility model Figure 2 Enlarged view of point A in the image.

[0021] The attached diagram lists the components represented by each number as follows:

[0022] 1. Sleeve; 2. Groove; 3. Movable plate; 4. Bolt; 5. Stud; 6. Threaded hole; 7. Threaded ring; 8. Threaded groove; 9. Annular groove; 10. Flow channel; 11. Water inlet hole; 12. Connector; 13. Filter screen. Detailed Implementation

[0023] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0024] like Figures 1-6 As shown, a modular geothermal well support structure includes multiple casings 1. Multiple grooves 2 are symmetrically opened from top to bottom on the sidewalls of the casings 1. Each groove 2 is equipped with a support component. The multiple casings 1 are connected to each other. Each casing 1 is equipped with a pumping component on its sidewall.

[0025] like Figure 1 and Figure 4 As shown, the support assembly includes a movable plate 3 that is movably connected to the side wall of the groove 2 near the middle. The side wall of the movable plate 3 is provided with a locking element, and the side wall of the groove 2 is threadedly connected to the upper side of the movable plate 3 with a bolt 4.

[0026] like Figure 4 As shown, the locking component includes a stud 5 threadedly connected to the side wall of the movable plate 3, and two threaded holes 6 are opened on the side wall of the groove 2 away from the movable plate 3, with the stud 5 and the threaded holes 6 being adapted to each other.

[0027] Specifically, the number of grooves 2 on the surface of a single sleeve 1 is several, which can be evenly distributed. The movable plate 3 is deployed at the corresponding position according to the drilling depth to support the sleeve 1 inside the drill hole. The deployment angle of the movable plate 3 is 80°-90° and is limited by bolts 4. In addition, when the movable plate 3 is retracted downwards, the stud 5 can be connected to the lower threaded hole 6. When the movable plate 3 is about to descend inside the drill hole, the stud 5 can be removed, the movable plate 3 can be flipped upwards for storage, and the stud 5 can be screwed into the upper threaded hole 6 through the movable plate 3.

[0028] like Figure 2 and Figure 3 As shown, a threaded ring 7 is fixedly connected to the bottom end face of the sleeve 1, and a threaded groove 8 is opened on the top end face of the sleeve 1. The threaded ring 7 is threadedly connected to the threaded groove 8.

[0029] Multiple casings 1 are connected by threads, which not only provides a seal but also enables convenient and quick docking. Furthermore, during well wall protection, soil structures will not enter the interior of the casing 1, effectively improving its efficiency.

[0030] like Figure 2 river Figure 6As shown, the pumping assembly includes an annular groove 9 formed inside the sleeve 1. Multiple flow channels 10 are formed on the sidewall of the annular groove 9. A threaded ring 7 passes through the bottom of each flow channel 10, and a threaded groove 8 passes through the top of each flow channel 10. Multiple water inlet holes 11 are formed on the sidewall of each flow channel 10. A connector 12 is fixedly connected to the sidewall of the uppermost sleeve 1, and the connector 12 communicates with the annular groove 9. The water inlet holes 11 are countersunk structures, and filter screens 13 are fitted to the sidewalls of each water inlet hole 11. When the two sleeves 1 are connected, the flow channels 10 on both sides are in a connected state.

[0031] During drilling, to prevent excessive water flow from affecting the wellbore soil structure, the uppermost casing 1 with connector 12 needs to be removed each time casing 1 is connected. The newly added casing 1 is then installed between the lower casing 1 and the casing 1 with connector 12, and connector 12 is connected to an external pump. During drilling, the pump can be started, allowing excess water in the borehole to flow into the guide channel 10 through the inlet hole 11 and then be extracted through connector 12. Simultaneously, the filter screen 13 can filter out impurities such as stones, particles, and mud from the water.

[0032] The working principle of this utility model is as follows: When the drill bit digs to a depth that allows a single casing 1 to be placed halfway, the drill bit and drill rod are first removed, and the casing 1 is placed in the borehole. At this time, the movable plates 3 on both sides are unfolded so that the movable plates 3 can fit against the ground or the drill rod support to support the casing 1. Then, the drill bit and drill rod are placed inside the casing 1 to continue drilling. When drilling to a certain depth, when connecting the drill rod, one casing 1 is first selected and screwed into the threaded groove 8 through the threaded ring 7. Then, the casing 1 with the drive connector 12 is screwed onto the lower casing 1. The bolts 4 on the upper side of the movable plate 3 are loosened and the movable plate 3 at the corresponding position on the upper side is opened. After the casing 1 descends, the upper movable plate 3 is used to continue to provide support. Then, the drill rod is connected and drilling continues. By repeating the above steps, continuous support for the well wall can be achieved.

[0033] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A modular geothermal wellbore support structure, characterized in that: It includes multiple sleeves (1), and the sidewalls of the sleeves (1) are symmetrically provided with multiple grooves (2) from top to bottom. Each groove (2) is provided with a support component. The multiple sleeves (1) are connected to each other, and each sidewall of the sleeves (1) is provided with a pumping component.

2. The modular geothermal wellbore support structure according to claim 1, characterized in that: The support assembly includes a movable plate (3) movably connected to the side wall of the groove (2) near the middle. The side wall of the movable plate (3) is provided with a locking element, and the side wall of the groove (2) is threadedly connected to the upper side of the movable plate (3) with a bolt (4).

3. The modular geothermal wellbore support structure according to claim 2, characterized in that: The locking component includes a stud (5) threaded to the side wall of the movable plate (3), and two threaded holes (6) are opened on the side wall of the groove (2) away from the movable plate (3), and the stud (5) is adapted to the threaded holes (6).

4. The modular geothermal wellbore support structure according to claim 1, characterized in that: A threaded ring (7) is fixedly connected to the bottom end face of the sleeve (1), and a threaded groove (8) is opened on the top end face of the sleeve (1). The threaded ring (7) is threadedly connected to the threaded groove (8).

5. The modular geothermal wellbore support structure according to claim 4, characterized in that: The pumping assembly includes an annular groove (9) inside the sleeve (1). The annular groove (9) has multiple flow channels (10) on its sidewall. The bottom of the flow channel (10) is penetrated by a threaded ring (7), and the top of the flow channel (10) is penetrated by a threaded groove (8). The sidewall of the flow channel (10) has multiple water inlet holes (11). The uppermost sidewall of the sleeve (1) is fixedly connected to a connector (12), which communicates with the annular groove (9).

6. The modular geothermal wellbore support structure according to claim 5, characterized in that: The water inlet (11) has a submerged hole structure, and the sidewalls of the water inlet (11) are all equipped with filter screens (13).

7. A modular geothermal wellbore support structure according to claim 5, characterized in that: When the sleeves (1) on both sides are in the docking state, the flow channels (10) on both sides are in the connected state.

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