A type of auxiliary equipment for ground source heat pump drilling

Abstract

This invention relates to the field of ground source heat pump drilling technology, and particularly to an auxiliary device for ground source heat pump drilling, comprising a rigid support unit, an elastic support unit, a conversion unit, and an adjustment unit. Through the coordinated operation of the rigid support unit, elastic support unit, conversion unit, and adjustment unit, this invention achieves adaptive switching of working state and contact area under varying well diameter. In the wide diameter section, the inner and outer sleeves rotate relative to each other, and the main and auxiliary support components jointly contact the well wall to form stable support, effectively avoiding excessive scraping of loose formations that could cause diameter expansion, while also reducing frictional resistance with the well wall. In the narrow diameter section, the conversion unit switches the inner and outer sleeves to a synchronous rotation state, and the adjustment unit drives the auxiliary support component to retract, leaving only the main support component in contact with the well wall and rotating to scrape it, significantly reducing frictional resistance while efficiently removing mud cake and eliminating the risk of blockage.

Description

Technical Field

[0001] This invention relates to the field of ground source heat pump drilling technology, and in particular to a ground source heat pump drilling auxiliary device. Background Technology

[0002] Ground source heat pump drilling is a crucial step in the installation of a ground source heat pump system. Its core principle is to utilize underground soil or water as a stable heat source, achieving efficient energy exchange through drilling and laying heat exchange pipes. During the drilling phase, drilling relies on a drill bit for propulsion. To ensure verticality, drill rod stabilizers are used to restrain the radial oscillation of the drill rod, preventing borehole deviation and failure.

[0003] Ground source heat pump drilling typically uses well diameters of 100-200mm, which are considered small-diameter wells. When the formation at the drilling location is uneven (such as soil collapse or weathered rock fissures), well diameter fluctuations are likely to occur. Currently, mainstream drill pipe centralizers can be divided into two types based on their support method: rigid centralizers and flexible centralizers. Rigid centralizers have fixed radial dimensions and high support stiffness, but they cannot adapt to well diameter fluctuations. If hard rock interlayers are encountered, the impact force of drill pipe rotation will be directly transmitted to the centralizer element, which is prone to problems such as cracking and falling off. Flexible centralizers can flexibly expand and contract radial dimensions to adapt to well diameter fluctuations, but their support stiffness is low, which can easily cause drilling trajectory deviations, leading to obstruction when the buried pipe is lowered.

[0004] Furthermore, centralizers can be divided into rotary centralizers and non-rotating centralizers. Rotating centralizers rotate synchronously with the drill pipe throughout the drilling process, resulting in greater friction with the well wall. In small-diameter sections, the rotating scraping action can remove some mud cake and has a certain anti-sticking effect. However, in large-diameter sections, the rotational friction between the centralizer and the well wall can directly scrape loose formations (such as sand layers and silty clay layers), causing excessive enlargement. Non-rotating centralizers do not rotate with the drill pipe and have less friction with the well wall, which can reduce drilling resistance. However, since the centralizer is relatively stationary with the well wall, it can only rely on the slight movement of the drill pipe rotation to scrape the well wall and has no scraping function. Therefore, it cannot remove mud cake and loose rock cuttings, increasing the risk of sticking. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a ground source heat pump drilling auxiliary device to solve the technical problems existing in the prior art, including a rigid support unit and an elastic support unit.

[0006] The rigid support unit includes an inner sleeve and a fixing member. The inner sleeve is fitted onto the outside of the drill rod, and the fixing member is used to fix the inner sleeve to the drill rod.

[0007] The elastic support unit includes an outer sleeve, a main support member, and an auxiliary support member. The outer sleeve is coaxially disposed outside the inner sleeve. The side wall of the outer sleeve is provided with a plurality of main support members and auxiliary support members that are elastically slidably connected along its radial direction. The main support members and auxiliary support members are evenly distributed along the circumference of the outer sleeve.

[0008] It also includes a conversion unit and an adjustment unit. The conversion unit is used to switch the relative motion state between the inner sleeve and the outer sleeve, and the adjustment unit is used to adjust the position of the auxiliary support member radially along the outer sleeve.

[0009] In the initial state, the inner sleeve and the outer sleeve are in a state of relative rotation. The auxiliary support and the main support are in contact with the well wall at the same time and provide support together. During the drilling process, the inner sleeve rotates synchronously with the drill pipe, while the outer sleeve does not rotate.

[0010] When the main support component contacts the narrow section of the well wall, the adjustment unit drives the auxiliary support component to move towards the central axis of the outer sleeve. The main support component contacts and supports the well wall independently. At the same time, the conversion unit switches the inner sleeve and outer sleeve to a synchronous rotation state. The main support component rotates synchronously with the outer sleeve to perform rotational scraping on the narrow section of the well wall.

[0011] Preferably, the conversion unit includes a guide rod fixedly connected to the inner side of the main support member, a guide hole corresponding to the guide rod is opened on the outer sleeve, a guide sleeve is installed in the guide hole, the guide rod and the guide sleeve are slidably sealed, and a mating hole corresponding to the guide rod is opened on the outer side of the inner sleeve. In the initial state, the guide rod is located outside the mating hole.

[0012] Preferably, the guide rod consists of a fixed section fixedly connected to the main support member and an elastic section elastically slidably installed at the end of the fixed section away from the main support member, and a ball bearing is rotatably installed at the end of the elastic section away from the main support member.

[0013] Preferably, the adjustment unit includes an adjustment ring rotatably sleeved on the outer side of the inner sleeve, a connecting rod hinged between the adjustment ring and the fixed end of the guide rod, and an adjustment groove corresponding to the auxiliary support member on the adjustment ring. A sliding rod is slidably connected in the adjustment groove and is rotatably connected to the auxiliary support member.

[0014] Preferably, the adjusting chute consists of a chute 1 and a chute 2 connected end to end. The absolute value of the slope of the chute 1 is less than the absolute value of the slope of the chute 2. In the initial state, the slide rod is located at the end of the chute 1 that is far away from the chute 2.

[0015] Preferably, the main support component includes an arc-shaped spring plate, with a plurality of protruding strips installed along its width direction on the side of the arc-shaped spring plate away from the outer sleeve, and the upper and lower ends of the arc-shaped spring plate being horizontally slidably connected to a limiting ring fixedly mounted on the outer sleeve.

[0016] Preferably, the auxiliary support includes an arc-shaped plate, with a plurality of protruding strips installed along its width on the side of the arc-shaped plate away from the outer sleeve, and a limiting rod fixedly installed on the side of the arc-shaped plate close to the outer sleeve. The outer sleeve has limiting holes corresponding to the limiting rods, and a limiting sleeve is installed in the limiting hole. The limiting rod and the limiting sleeve are elastically slidably sealed together.

[0017] Preferably, the fastener includes two internal threaded rings, which are located at the upper and lower ends of the inner sleeve, respectively. Each internal threaded ring consists of a connecting ring with a threaded groove on its inner wall and a pressure ring fixedly connected to the connecting ring. The outer sides of both the upper and lower ends of the inner sleeve are provided with engagement grooves. The inner wall of the pressure ring fits against the side wall of the engagement groove, and the pressure ring and the engagement groove are fixedly connected by bolts.

[0018] Preferably, the limiting ring has a groove on the side near the bow-shaped spring plate that corresponds to the bow-shaped spring plate. The end of the bow-shaped spring plate is slidably installed in the groove. The outer sleeve has a clearance groove at the upper and lower ends of the bow-shaped spring plate. A sealing plate is fixedly installed at both the upper and lower ends of the bow-shaped spring plate. The end of the sealing plate away from the bow-shaped spring plate is slidably and sealingly connected to the corresponding clearance groove.

[0019] As can be seen from the above technical solutions, the ground source heat pump drilling auxiliary equipment designed in this invention has the following beneficial effects: Through the coordinated cooperation of the rigid support unit, the elastic support unit, the conversion unit, and the adjustment unit, this invention achieves adaptive switching of working state and contact area under changes in well diameter. In the wide diameter section, the inner and outer sleeves rotate relative to each other, and the main and auxiliary support components jointly contact the well wall to form stable support, effectively avoiding excessive scraping of loose formations that could cause diameter expansion, while reducing frictional resistance with the well wall. In the narrow diameter section, the conversion unit switches the inner and outer sleeves to a synchronous rotation state, and the adjustment unit drives the auxiliary support component to retract, so that only the main support component contacts the well wall and rotates to scrape the wall, greatly reducing frictional resistance while efficiently removing mud cake and eliminating the risk of jamming. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0022] Figure 2 This is the front view of the present invention.

[0023] Figure 3 It is a three-dimensional structural diagram of the inner sleeve and the fastener.

[0024] Figure 4 This is a top sectional view of the conversion unit and the adjustment unit in their initial state.

[0025] Figure 5This is a top sectional view of the conversion unit and the adjustment unit in another state.

[0026] Figure 6 It is a three-dimensional structural diagram of the inner sleeve, outer sleeve, adjusting ring, and adjusting groove.

[0027] Figure 7 This is a partial three-dimensional structural diagram of the elastic support unit.

[0028] Figure 8 It is a partial three-dimensional structural diagram of the inner sleeve, outer sleeve, etc.

[0029] Figure 9 yes Figure 3 Enlarged view of point A in the middle.

[0030] Reference numerals: 1. Rigid support unit; 2. Elastic support unit; 3. Conversion unit; 4. Adjustment unit; 11. Inner sleeve; 12. Fixing component; 21. Outer sleeve; 22. Main support component; 23. Auxiliary support component; 24. Limiting ring; 31. Guide rod; 32. Guide sleeve; 33. Mating hole; 41. Adjusting ring; 42. Connecting rod; 43. Adjusting groove; 44. Sliding rod; 121. Connecting ring; 122. Pressing ring; 221. Bow-shaped spring plate; 222. Protrusion 1; 223. Closing plate; 231. Arc plate; 232. Protrusion 2; 233. Limiting rod; 234. Limiting sleeve; 311. Fixed section; 312. Elastic section; 431. Inclined groove 1; 432. Inclined groove 2. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] See Figure 1 , Figure 2 and Figure 4 A ground source heat pump drilling auxiliary device includes a rigid support unit 1, an elastic support unit 2, a conversion unit 3, and an adjustment unit 4.

[0033] See Figure 1 The rigid support unit 1 includes an inner sleeve 11 and a fixing member 12. The inner sleeve 11 is sleeved on the outside of the drill rod (not shown in the figure), and the fixing member 12 is used to fix the inner sleeve 11 to the drill rod.

[0034] See Figure 2 and Figure 4The elastic support unit 2 includes an outer sleeve 21, a main support member 22, and an auxiliary support member 23. The outer sleeve 21 is coaxially disposed outside the inner sleeve 11. The side wall of the outer sleeve 21 is provided with a plurality of main support members 22 and auxiliary support members 23 that are elastically slidably connected along its radial direction. The main support members 22 and auxiliary support members 23 are evenly distributed along the circumference of the outer sleeve 21. The conversion unit 3 is used to switch the relative motion state between the inner sleeve 11 and the outer sleeve 21, and the adjustment unit 4 is used to adjust the position of the auxiliary support member 23 along the radial direction of the outer sleeve 21.

[0035] The number of elastic support units 2 can be selected according to actual needs. When multiple elastic support units 2 are required, the multiple elastic support units 2 are evenly distributed along the axial direction of the inner sleeve 11, and the upper and lower adjacent elastic support units 2 do not interfere with each other.

[0036] In the initial state, the inner sleeve 11 and the outer sleeve 21 are in a state of relative rotation. The auxiliary support 23 and the main support 22 are in contact with the well wall at the same time and provide support together. During the drilling process, the inner sleeve 11 rotates synchronously with the drill pipe, while the outer sleeve 21 does not rotate.

[0037] When the main support member 22 contacts the narrow section of the well wall, the adjustment unit 4 drives the auxiliary support member 23 to move towards the central axis of the outer sleeve 21. The main support member 22 contacts the well wall alone and provides support. At the same time, the conversion unit 3 switches the inner sleeve 11 and the outer sleeve 21 to a synchronous rotation state. The main support member 22 rotates synchronously with the outer sleeve 21 to rotate and scrape the narrow section of the well wall, reducing jamming. This achieves automatic wall scraping and anti-jamming in the narrow section and automatic friction reduction and anti-expansion in the wide section.

[0038] See Figure 1 and Figure 3 The fixing member 12 includes two internal threaded rings, which are located at the upper and lower ends of the inner sleeve 11 respectively. The internal threaded ring is composed of a connecting ring 121 with a threaded groove on its inner wall and a pressing ring 122 fixedly connected to the connecting ring 121. The outer sides of the upper and lower ends of the inner sleeve 11 are provided with engagement grooves. The inner wall of the pressing ring 122 fits against the side wall of the engagement groove. The pressing ring 122 and the engagement groove are fixedly connected by bolts.

[0039] Before drilling, the inner sleeve 11 is fitted onto the outside of the drill pipe. Then, two internal threaded rings are fitted onto the upper and lower ends of the inner sleeve 11 respectively, and the connecting ring 121 is threadedly fixed to the drill pipe. After fixing, the upper and lower positions of the inner sleeve 11 are limited by the two internal threaded rings. Then, the pressure ring 122 is fixedly connected to the inner sleeve 11 by bolts, so that during the subsequent drilling process, the drill pipe can drive the inner sleeve 11 to rotate synchronously through the internal threaded rings.

[0040] See Figure 4 , Figure 5 and Figure 9The conversion unit 3 includes a guide rod 31 fixedly connected to the inner side of the main support member 22. The outer sleeve 21 has guide holes corresponding to the guide rod 31. A guide sleeve 32 is installed in the guide hole. The guide rod 31 and the guide sleeve 32 are slidably sealed together. The outer side of the inner sleeve 11 has mating holes 33 corresponding to the guide rod 31. In the initial state, the guide rod 31 is located outside the mating hole 33. The guide rod 31 does not rotate with the inner sleeve 11, that is, the outer sleeve 21 does not rotate. The outer side of the inner sleeve 11 has multiple annular grooves for accommodating the conversion unit 3. The annular grooves are connected to the mating holes 33.

[0041] When the main support member 22 contacts the narrow section of the well wall, the main support member 22 drives the guide rod 31 to move towards the central axis of the outer sleeve 21, so that the end of the guide rod 31 away from the main support member 22 extends into the mating hole 33. At this time, the inner sleeve 11 can drive the main support member 22 to rotate through the guide rod 31. Even if the inner sleeve 11 and the outer sleeve 21 rotate synchronously, during the rotation, the main support member 22 rotates and scrapes the narrow section of the well wall to remove the mud cake attached to the well wall and eliminate the risk of jamming.

[0042] See Figure 4 and Figure 5 The guide rod 31 consists of a fixed section 311 fixedly connected to the main support member 22 and an elastic section 312 elastically slidably installed at the end of the fixed section 311 away from the main support member 22. Specifically, the elastic section 312 is connected to the fixed end by a helical spring. A ball bearing is rotatably installed at the end of the elastic section 312 away from the main support member 22 to reduce the friction force on the inner sleeve 11 when it rotates, in the state where the elastic rod is in contact with the inner sleeve 11.

[0043] In the initial state, the elastic section 312 of the guide rod 31 is far away from the main support member 22, and the overall length of the guide rod 31 is at its longest. When the narrow section of the well wall squeezes the main support member 22, causing the main support member 22 to drive the guide rod 31 to move towards the central axis of the outer sleeve 21, if the end of the guide rod 31 away from the main support member 22 does not correspond to the mating hole 33 on the inner sleeve 11, then under the pressure of the inner sleeve 11, the elastic section 312 of the guide rod 31 moves towards the main support member 22, that is, the overall length of the guide rod 31 is shortened, so as to avoid interference with the rotation of the inner sleeve 11.

[0044] When the inner sleeve 11 rotates to the position corresponding to the mating hole 33 and the elastic section 312, the pressure of the inner sleeve 11 on the elastic section 312 disappears, and the elastic section 312 moves away from the main support member 22, extending into the mating hole 33. At this time, the inner sleeve 11 can drive the outer sleeve 21 and the main support member 22 to rotate synchronously through the guide rod 31. In order to facilitate the rapid docking of the elastic section 312 and the mating hole 33, the end of the mating hole 33 or the end of the elastic section 312 can be chamfered.

[0045] When moving from the narrow diameter section to the wide diameter section of the well wall, the pressure exerted by the well wall on the main support member 22 decreases. The main support member 22 drives the guide rod 31 to reverse and reset, causing the elastic section 312 to move out of the mating hole 33. The inner sleeve 11 and the outer sleeve 21 return to a state of relative rotation. The outer sleeve 21 does not rotate with the inner sleeve 11, thereby reducing the friction between the outer sleeve 21 and the well wall during the movement and avoiding excessive scraping of the well wall that would cause the diameter to expand.

[0046] See Figure 4 , Figure 5 and Figure 6 The adjustment unit 4 includes an adjustment ring 41 rotatably sleeved on the outside of the inner sleeve 11. A connecting rod 42 is hinged between the adjustment ring 41 and the fixed end of the guide rod 31. An adjustment groove 43 corresponding to the auxiliary support member 23 is opened on the adjustment ring 41. A sliding rod 44 is slidably connected in the adjustment groove 43. The sliding rod 44 is rotatably connected to the auxiliary support member 23.

[0047] See Figure 6 The adjusting sloping groove 43 is composed of a first sloping groove 431 and a second sloping groove 432 connected end to end. The absolute value of the slope of the first sloping groove 431 is less than the absolute value of the slope of the second sloping groove 432. In the initial state, the sliding rod 44 is located at the end of the first sloping groove 431 that is away from the second sloping groove 432.

[0048] When the main support member 22 contacts the well wall at different positions, it will generate corresponding elastic deformation, which will cause the guide rod 31 to slide along the guide sleeve 32. When the guide rod 31 moves, it will drive the adjusting ring 41 to rotate through the connecting rod 42, thereby changing the relative position of the slide rod 44 and the adjusting groove 43. Setting the slide rod 44 to be rotatably connected to the auxiliary support member 23 can reduce the resistance when the slide rod 44 slides in the adjusting groove 43.

[0049] When the slide rod 44 slides in the inclined groove 431 (i.e. when the well wall is relatively wide), the radial displacement of the auxiliary support 23 is the same as the radial displacement of the main support 22. The auxiliary support 23 and the main support 22 work together to provide support and ensure the stability of the support.

[0050] When the slide rod 44 slides in the inclined groove 432 (i.e., when the well wall is narrow), the radial displacement of the auxiliary support 23 is greater than the radial displacement of the main support 22. The outer wall of the auxiliary support 23 does not contact the well wall and only plays a supporting role through the main support 22. This reduces the contact area between the elastic support unit 2 and the well wall, reduces frictional resistance, avoids drilling jamming due to excessive contact area and excessive friction, and ensures that the drill rod can pass through the narrow diameter section smoothly at normal speed.

[0051] It should be noted that the slopes of inclined groove 1 431 and inclined groove 2 432 were determined by those skilled in the art through calculation.

[0052] See Figure 1 , Figure 4 , Figure 5 and Figure 7 The main support member 22 includes an arc-shaped spring plate 221. Several protrusions 222 are installed on the side of the arc-shaped spring plate 221 away from the outer sleeve 21 along its width direction. The upper and lower ends of the arc-shaped spring plate 221 are horizontally slidably connected to the limiting ring 24 fixedly set on the outer sleeve 21.

[0053] See Figure 1 , Figure 4 , Figure 5 and Figure 7 The auxiliary support member 23 includes an arc-shaped plate 231. Several protrusions 232 are installed on the side of the arc-shaped plate 231 away from the outer sleeve 21 along its width direction. A limit rod 233 is fixedly installed on the side of the arc-shaped plate 231 close to the outer sleeve 21. A limit hole corresponding to the limit rod 233 is opened on the outer sleeve 21. A limit sleeve 234 is installed in the limit hole. The limit rod 233 and the limit sleeve 234 are elastically slidably sealed. Specifically, the end of the limit rod 233 away from the arc-shaped plate 231 is connected to the limit sleeve 234 through a support spring.

[0054] When the slide rod 44 slides in the inclined groove 431, the second protrusion 232 contacts the well wall. While cooperating with the main support 22 to provide support, it reduces the frictional resistance between the well wall and the auxiliary support 23. When the slide rod 44 slides in the inclined groove 432, the second protrusion 232 does not contact the well wall, thereby further reducing the contact area in the narrow section of the well wall and reducing the frictional resistance a second time.

[0055] As the well wall gradually increases, the slide bar 44 reverses and resets. During the reset process, the elastic force of the support spring assists and also plays a certain role in buffering and protection.

[0056] See Figure 7 and Figure 8 The limiting ring 24 has a sliding groove on the side near the bow-shaped spring plate 221 that corresponds to the bow-shaped spring plate 221. The end of the bow-shaped spring plate 221 is slidably installed in the sliding groove. The outer sleeve 21 has a clearance groove at the upper and lower ends of the bow-shaped spring plate 221. A sealing plate 223 is fixedly installed at both the upper and lower ends of the bow-shaped spring plate 221. The end of the sealing plate 223 away from the bow-shaped spring is slidably and sealed to the corresponding clearance groove.

[0057] During drilling, the elastic force of the bow-shaped spring plate 221 causes the protrusion 222 to contact the well wall, thereby providing support while reducing the friction between the well wall and the main support member 22. The end of the bow-shaped spring plate 221 slides in the corresponding groove as the diameter of the well wall changes. During the sliding process, the sealing plate 223 always seals the groove to prevent mud or stones from entering the groove and causing jamming.

[0058] When the outer sleeve 21 rotates together with the inner sleeve 11, the well wall is scraped by the rotating convex strip 222. The strip-shaped convex strip 222 has a smaller contact area with the well wall, thus achieving a better scraping effect under the same pressure, effectively removing mud cake and preventing jamming.

[0059] In summary, this invention addresses the challenges of caliper fluctuations and the single-function limitations of centralizers in small-diameter ground source heat pump drilling. Through a core design that combines rigid and elastic support, automatic state switching, and adaptive adjustment of contact area, it solves the technical difficulties of traditional centralizers in simultaneously addressing anti-jamming and anti-diameter expansion, as well as the inability to balance support stability and caliper compatibility. This makes it suitable for the actual engineering needs of ground source heat pump drilling. Furthermore, the device has a simple structure, composed of conventional mechanical parts, making it easy to process and assemble, highly versatile, and directly compatible with existing drill pipes and drilling equipment. Damaged parts are easily replaceable, significantly reducing manufacturing and maintenance costs. It meets the batch operation requirements of ground source heat pump drilling, providing reliable assurance for subsequent underground pipe installation and heat exchange efficiency, and possesses significant engineering and economic value.

[0060] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0061] In the description of this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0062] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0063] The above provides a detailed description of a ground source heat pump drilling auxiliary device provided by the present invention. For those skilled in the art, based on the ideas of the embodiments of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A ground source heat pump drilling auxiliary device, characterized in that: The system includes a rigid support unit and an elastic support unit. The rigid support unit includes an inner sleeve and a fixing component. The inner sleeve is fitted onto the outside of the drill pipe, and the fixing component securely connects the inner sleeve to the drill pipe. The elastic support unit includes an outer sleeve, a main support component, and an auxiliary support component. The outer sleeve is coaxially positioned outside the inner sleeve. Multiple main and auxiliary support components are provided on the sidewall of the outer sleeve, elastically slidingly connected radially. The main and auxiliary support components are evenly spaced along the circumference of the outer sleeve. The system also includes a conversion unit and an adjustment unit. The conversion unit switches the relative motion state between the inner and outer sleeves, and the adjustment unit adjusts the position of the auxiliary support component radially along the outer sleeve. Initially, the inner and outer sleeves rotate relative to each other, and the auxiliary and main support components simultaneously contact the wellbore for support. During drilling, the inner sleeve rotates synchronously with the drill pipe, while the outer sleeve does not rotate. When the main support component contacts the narrow section of the well wall, the adjustment unit drives the auxiliary support component to move towards the central axis of the outer sleeve. The main support component contacts the well wall alone and provides support. At the same time, the conversion unit switches the inner sleeve and outer sleeve to a synchronous rotation state. The main support component rotates synchronously with the outer sleeve to perform rotational scraping on the narrow section of the well wall. The conversion unit includes a guide rod fixedly connected to the inner side of the main support member. The outer sleeve has guide holes corresponding to the guide rods. A guide sleeve is installed in the guide hole. The guide rod and the guide sleeve are slidably sealed together. The outer side of the inner sleeve has mating holes corresponding to the guide rods. In the initial state, the guide rod is located outside the mating hole.

2. The ground source heat pump drilling auxiliary equipment according to claim 1, characterized in that, The guide rod consists of a fixed section that is fixedly connected to the main support member and an elastic section that is flexibly installed on the fixed section at the end away from the main support member. A ball bearing is rotatably installed on the end of the elastic section away from the main support member.

3. The ground source heat pump drilling auxiliary equipment according to claim 2, characterized in that, The adjustment unit includes an adjustment ring rotatably sleeved on the outer side of the inner sleeve. A connecting rod is hinged between the adjustment ring and the fixed end of the guide rod. An adjustment groove corresponding to the auxiliary support is opened on the adjustment ring. A sliding rod is slidably connected in the adjustment groove and is rotatably connected to the auxiliary support.

4. The ground source heat pump drilling auxiliary equipment according to claim 3, characterized in that, The adjusting chute consists of two chutes connected end to end, namely chute one and chute two. The absolute value of the slope of chute one is less than the absolute value of the slope of chute two. In the initial state, the slide rod is located at the end of chute one that is far away from chute two.

5. The ground source heat pump drilling auxiliary equipment according to claim 1, characterized in that, The main support component includes an arc-shaped spring plate. Several protruding strips are installed on the side of the arc-shaped spring plate away from the outer sleeve along its width direction. The upper and lower ends of the arc-shaped spring plate are horizontally slidably connected to the limiting rings fixed on the outer sleeve.

6. The ground source heat pump drilling auxiliary equipment according to claim 1, characterized in that, The auxiliary support includes an arc-shaped plate. Several protruding strips are installed on the side of the arc-shaped plate away from the outer sleeve along its width direction. A limit rod is fixedly installed on the side of the arc-shaped plate close to the outer sleeve. Limiting holes corresponding to the limit rods are opened on the outer sleeve. Limiting sleeves are installed in the limiting holes. The limit rods and limit sleeves are elastically slidably sealed together.

7. The ground source heat pump drilling auxiliary equipment according to claim 1, characterized in that, The fastener includes two internal threaded rings, which are located at the upper and lower ends of the inner sleeve, respectively. Each internal threaded ring consists of a connecting ring with a threaded groove on its inner wall and a pressure ring that is fixedly connected to the connecting ring. The outer sides of both the upper and lower ends of the inner sleeve are provided with engagement grooves. The inner wall of the pressure ring fits against the side wall of the engagement groove. The pressure ring and the engagement groove are fixedly connected by bolts.

8. The ground source heat pump drilling auxiliary equipment according to claim 5, characterized in that, The limiting ring has a groove on the side near the bow-shaped spring plate that corresponds to the bow-shaped spring plate. The end of the bow-shaped spring plate is slidably installed in the groove. The outer sleeve has clearance grooves at the upper and lower ends of the bow-shaped spring plate. A sealing plate is fixedly installed at both the upper and lower ends of the bow-shaped spring plate. The end of the sealing plate away from the bow-shaped spring plate is slidably and sealingly connected to the corresponding clearance groove.

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