A centering device structure with tube-holding function

Abstract

This invention discloses a centering device structure with a pipe-holding function, including a pipe-holding centering device base mounted on a drilling rig. Two left-right swing brackets are symmetrically hinged on the pipe-holding centering device, and two left-right swing supports are hinged opposite each other at their middle portions. Two outer clamping plates are oppositely mounted on the two left-right swing supports. During drilling operations, two internal drilling chucks are oppositely mounted on the two external clamping plates, and a drilling connection frame is located between the ends of the two left-right swing brackets away from the pipe-holding centering device base. When the drilling rig needs to perform casing installation, two internal pipe-holding clamping plates are oppositely mounted on the two external clamping plates, and a pipe-holding cylinder is located between the ends of the two left-right swing brackets away from the pipe-holding centering device base. This invention allows for convenient and timely changes in construction methods according to construction needs, achieving the effects of convenience, speed, improved production efficiency, and reduced labor intensity.

Description

Technical Field

[0001] This invention relates to the field of drilling rig accessories technology, and in particular to a centering device structure with pipe clamping function. Background Technology

[0002] In recent years, due to the increasing demand for water conservancy in industrial and agricultural production, various drilling rigs widely applicable to drilling water wells, ground source heat pump wells, hot spring wells, monitoring wells and other exploratory drilling projects have been applied to a wider range of areas, at greater depths and in more complex geological formations.

[0003] During drilling, in order to ensure the quality of the borehole, the construction technology of simultaneously drilling and installing casing is becoming increasingly widespread. However, the existing casing installation technology mainly relies on the casing eccentric drill bit to install casing while drilling, relying on the weight of the casing itself and the drive of the eccentric drill bit. As the depth increases and the strata change, the coaxiality of the casing and drill rod becomes worse and worse, and the casing installation effect becomes worse and worse, and even the phenomenon of not being able to install casing becomes more and more prominent, which invisibly affects the construction efficiency and the quality of the borehole.

[0004] In existing water well drilling rigs, the casing is first driven to a certain depth using a down-the-hole drill bit, with the upper part of the casing protruding from the borehole opening. Then, the lower end of another casing section is joined to it and welded for reinforcement. Due to existing structural limitations, the end-to-end connection of the casing is difficult, resulting in poor straightness after connection and welding difficulties. Because the coaxiality of the casing and drill pipe cannot be guaranteed, the verticality of the borehole is significantly affected when the casing depth is large. In addition, since the construction is mostly carried out in the field, the environment is harsh and there is a lack of auxiliary lifting equipment. Connecting a single casing often requires multiple people to cooperate and takes a long time, greatly reducing convenience. After construction is completed, the casing needs to be removed one by one, and there is a risk of the lower casing falling off. Therefore, it greatly increases the labor intensity and complexity of the operators, reduces production efficiency, wastes time, manpower and material resources, and increases construction costs.

[0005] like Figure 1 As shown, the centering device in the prior art consists of a positioning seat 1-1, a swing seat 1-2, a limiting seat 1-3, a rotating seat 1-4, an outer chuck 1-5, an inner chuck 1-6, a positioning pin 1-7, and a positioning pin 1-8. Figure 2 As shown, the outer chuck 1-5 has a groove 1-5-1 machined along the circumferential direction on its outer side to mate with the positioning seat 1-1 and the swing seat 1-2. Its inner diameter and upper end face have an end face 1-5-2 and an inner hole 1-5-3 machined to mate with the inner chuck 1-6. The upper end face has limiting grooves 1-5-4 machined on both the upper and lower sides to mate with the inner chuck 1-6. The lower left end face has a groove 1-5-5 machined to mate with the limiting seat 1-3. After machining, it is cut into two pieces along the direction shown in the figure. Figure 3As shown, the inner chuck 1-6 has a stop 1-6-1 that mates with the end face 1-5-2 and inner hole 1-5-3 of the outer chuck 1-5 along the circumferential direction, and a dovetail 1-6-6 that mates with the limiting groove 1-5-4. The lower part has a reinforcing ring 1-6-2 and a reinforcing rib 1-6-3. The inside has a directional sleeve 1-6-4, which has a centering hole that meets the construction requirements. After processing, it is cut into two pieces along the direction shown in the figure.

[0006] When assembling the existing centering device, remove the positioning pin 1-8, rotate the swing seat 1-2 around the positioning pin 1-7 by a certain angle, install one side of the outer chuck 1-5 with the groove 1-5-5 that mates with the limit seat 1-3 onto the positioning seat 1-1, and install the other side onto the swing seat 1-2. Then, install both sides of the inner chuck 1-6 onto the outer chuck 1-5 respectively, close the swing seat 1-2, and insert the positioning pin 1-8.

[0007] In existing water well drilling rigs, the drill pipe is centered and drilled through the inner hole 1-6-5 of the inner chuck 1-6. When the casing installation process requires follow-up, the inner chuck 1-6 needs to be removed. First, a down-the-hole drill bit is used to drive the casing to a certain depth, with the upper part of the casing protruding from the borehole. Then, the lower end of another casing section is joined to it and welded for reinforcement. Due to the limitations of the existing structure, the lower casing cannot be correctly positioned, the casing end faces are difficult to connect, and the straightness after connection is poor. Because the coaxiality of the casing and drill pipe cannot be guaranteed, when the casing depth is large, it affects the verticality of the borehole. The impact is significant, and the follow-up effect of the casing is getting worse and worse, even to the point of being unable to follow up. The hole-forming problem gradually becomes prominent, which affects the construction efficiency and hole-forming quality. At the same time, since the construction is mostly carried out in the field, the environment is harsh and there is a lack of auxiliary hoisting equipment. Connecting a single casing often requires the cooperation of many people and takes a long time to complete, which greatly reduces the convenience. In addition, after the construction is completed, the casings need to be removed one by one. There is a risk of the lower casing falling off. Therefore, it greatly increases the labor intensity and complexity of the operators, reduces production efficiency, wastes time, manpower and material resources, and increases construction costs. Summary of the Invention

[0008] The purpose of this invention is to provide a centering device structure with a tube-holding function, which solves the problems of traditional centering device structures having a single function, poor straightness after tube connection during tube lowering, and tube detachment during tube pulling.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0010] The present invention provides a centering device structure with pipe-holding function, including a pipe-holding centering device seat disposed on a drilling rig, two left and right swing bracket seats symmetrically hinged on the pipe-holding centering device, two left and right swing brackets hinged at opposite midpoints of the two left and right swing bracket seats, and two outer clamping plates disposed opposite each other on the two left and right swing brackets.

[0011] When the drilling rig is drilling, two drilling chucks are arranged opposite each other on the two outer clamps, and a drilling connecting frame is arranged between the ends of the two left and right swing brackets that are away from the pipe holding centerer.

[0012] When the drilling rig needs to perform follow-up casing installation, two inner casing clamps are provided opposite to each other on the two outer clamps, and a casing clamping cylinder is provided between the ends of the two left and right swing brackets that are away from the casing clamping centering device seat.

[0013] Furthermore, the tube clamping centering device seat includes an upper seat plate and a lower seat plate arranged in parallel. A connecting rib is fixedly arranged between the middle of the upper seat plate and the lower seat plate. Two sets of opposing first connecting sleeves and second connecting sleeves are symmetrically arranged on the upper seat plate and the lower seat plate. Two sets of reinforcing ribs are symmetrically fixedly arranged at the bottom of the lower seat plate.

[0014] Furthermore, each of the left and right swing bracket seats includes two spaced bracket base plates. A third connecting sleeve is provided at one end of each of the two bracket base plates. The third connecting sleeve is hinged to the corresponding first and second connecting sleeves via a first connecting pin. Two reinforcing plates are symmetrically fixed between the two bracket base plates. A reinforcing plate is fixedly provided in the middle of the opposite side of each of the two bracket base plates. A coaxial first connecting hole is opened in the middle of the two reinforcing plates. A fourth connecting sleeve and a fifth connecting sleeve are sequentially provided at the other end of each of the two bracket base plates. A cylinder connecting base plate is fixedly provided on the outer side of each of the two bracket base plates near the fourth and fifth connecting sleeves. Two connecting plates are symmetrically fixed on the side of the cylinder connecting base plate. A sixth connecting sleeve is provided on the part of each of the two connecting plates near the cylinder connecting base plate. Two seventh connecting sleeves are provided opposite each other at the free ends of the two connecting plates.

[0015] Furthermore, the third connecting sleeve is internally provided with a first self-lubricating alloy sleeve.

[0016] Furthermore, each of the left and right swing brackets includes a swing base plate. Two positioning blocks are symmetrically arranged on the swing base plate near the end. An upper reinforcing sleeve and a lower reinforcing sleeve are respectively fixedly arranged on the upper and lower surfaces of the middle part of the swing base plate near the corresponding left and right swing bracket seat. A second self-lubricating alloy sleeve is provided on both the upper and lower reinforcing sleeves. The second self-lubricating alloy sleeve is hinged to the corresponding first connecting hole by a second connecting pin. A limit block is fixedly arranged at the other end of the middle part of the swing base plate.

[0017] Furthermore, each of the outer clamping plates has a locking groove on its outer side along the circumferential direction that is adapted to the swing seat plate, and a first limiting groove adapted to the limiting block of the corresponding left and right swing bracket is opened on the outer side of the middle part of each of the outer clamping plates. The upper end face of the outer clamping plate is a mating end face and has a mating inner hole. The two ends of the mating end face have a second limiting groove adapted to the inner clamping plate of the tube or the inner chuck of the drill hole.

[0018] Furthermore, each of the inner chucks in the borehole has a first stop on its outer side along the circumferential direction that is adapted to the mating end face and the mating inner hole, and two first dovetails that are adapted to the two second limiting grooves are symmetrically arranged; an directional sleeve is provided on the inner side of the inner chuck in the borehole, and a directional hole is formed between the two directional sleeves of the two inner chucks in the borehole; a plurality of first reinforcing ribs are uniformly arranged on the outer circumferential wall of the directional sleeve, and the other ends of the plurality of first reinforcing ribs are fixedly connected to the inner wall of the reinforcing ring.

[0019] Furthermore, the drilling connection frame includes an upper connection plate and a lower connection plate arranged in parallel. The upper connection plate and the lower connection plate are fixedly connected by a connecting plate. The two ends of the upper connection plate and the lower connection plate are respectively provided with coaxial second connection holes. Each second connection hole is hinged to the fifth connection sleeve on the left and right swing bracket seat at the corresponding end by a third connection pin.

[0020] Furthermore, each of the inner clamping plates has a second stop on its outer side along the circumferential direction that matches the mating end face and the mating inner hole, and two second dovetails that match the two second limiting grooves respectively are symmetrically arranged; a clamping sleeve is provided on the inner side of the inner clamping plate, and a clamping inner hole is formed between the two clamping sleeves of the two inner clamping plates, and annular or serrated grooves are uniformly arranged on the peripheral wall of the clamping inner hole; a plurality of second reinforcing ribs are uniformly arranged on the outer peripheral wall of the clamping sleeve.

[0021] Furthermore, each of the aforementioned pipe-holding cylinders is a bidirectional cylinder, with each of its two telescopic ends provided with an earring pin hole. The earring pin hole is hinged to the seventh connecting sleeve on the corresponding end of the left and right swing bracket via a fourth connecting pin.

[0022] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0023] The casing-holding function of the centering device structure of this invention ensures the centering and positioning of the casing during drilling, effectively guaranteeing the straightness of the casing after docking and the coaxiality of the casing and drill rod during drilling, thus greatly improving the construction accuracy of casing drilling.

[0024] After drilling is completed, the casing needs to be removed one by one. By adjusting the oil inlet pressure (i.e., the clamping force of the casing sleeve on the casing), the casing is clamped tightly while preventing deformation. At this time, the upper casing is removed to prevent the lower casing from falling into the hole. By repeating this process, all casings can be removed.

[0025] This invention allows for timely and convenient changes to construction methods according to construction needs, achieving the effects of convenience, speed, improved production efficiency, and reduced labor intensity. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] Figure 1 This is a schematic diagram of a centering device structure in the prior art;

[0028] Figure 2 A schematic diagram of the external chuck structure of a prior art centering device;

[0029] Figure 3 A schematic diagram of the internal chuck structure of a prior art centering device;

[0030] Figure 4 This is a schematic diagram of the structure of the present invention during drilling;

[0031] Figure 5 for Figure 4 A schematic diagram of a cross-section;

[0032] Figure 6 for Figure 4 A longitudinal partial sectional view;

[0033] Figure 7 for Figure 4 Connection diagram of the drilling connection frame;

[0034] Figure 8 This is a schematic diagram of the structure of the present invention during the lowering of the sleeve;

[0035] Figure 9 for Figure 8 A schematic diagram of a cross-section;

[0036] Figure 10 for Figure 8 A longitudinal partial sectional view;

[0037] Figure 11 This is a front view of the tube-holding centerer base;

[0038] Figure 12 This is a top view of the tube-holding centering device base;

[0039] Figure 13 This is a cross-sectional view of the tube clamp centering device seat;

[0040] Figure 14 A top view of a single left-right swing support.

[0041] Figure 15 for Figure 14 A schematic diagram of a longitudinal stepped section;

[0042] Figure 16 for Figure 15 A schematic diagram of a horizontal stepped section;

[0043] Figure 17 A top view of a single left-right swinging bracket;

[0044] Figure 18 for Figure 17 The left view;

[0045] Figure 19 for Figure 17 A schematic diagram of a cross-section;

[0046] Figure 20 This is a top view of the two outer card plates;

[0047] Figure 21 This is a longitudinal sectional view of a single outer card plate;

[0048] Figure 22 This is a schematic diagram of the horizontal cross-section of the two outer card plates;

[0049] Figure 23 This is a top view of the two drilled holes with internal clamping plates;

[0050] Figure 24 for Figure 23 A schematic diagram of a cross-section;

[0051] Figure 25 This is a top view of the drilling connection bracket;

[0052] Figure 26 for Figure 25 A schematic diagram of the transverse section;

[0053] Figure 27 This is a top view of the two inner clamping plates of the pipe;

[0054] Figure 28 Bit Figure 27 A schematic diagram of a cross-section;

[0055] Explanation of reference numerals in the attached figures:

[0056] 1. Pipe clamping centering device seat; 101. Upper seat plate; 102. Lower seat plate; 103. Connecting stiffener plate; 104. First connecting sleeve; 105. Second connecting sleeve; 106. Reinforcing stiffener plate;

[0057] 2. Left and right swing bracket seat; 201. Bracket seat plate; 202. Third connecting sleeve; 203. Reinforcing plate; 204. Reinforcing plate; 205. Fourth connecting sleeve; 206. Fifth connecting sleeve; 207. Hydraulic cylinder connecting seat plate; 208. Connecting plate; 209. Sixth connecting sleeve; 210. Seventh connecting sleeve; 211. First self-lubricating alloy sleeve;

[0058] 3. Left and right swing bracket; 301. Swing seat plate; 302. Positioning block; 303. Upper reinforcing sleeve; 304. Lower reinforcing sleeve; 305. Second self-lubricating alloy sleeve; 306. Limiting block;

[0059] 4. Outer clamping plate; 401. Engaging groove; 402. First limiting groove; 403. Mating end face; 404. Mating inner hole; 405. Second limiting groove;

[0060] 5. Drilling chuck; 501. First stop; 502. First dovetail; 503. Orientation sleeve; 504. Reinforcing rib; 505. Reinforcing ring; 5001. Orientation hole;

[0061] 6. Drilling connection bracket; 601. Upper connecting plate; 602. Lower connecting plate; 603. Connecting plate; 604. Second connecting hole;

[0062] 7. Inner clamp of the tube; 701. Second stop; 702. Second dovetail; 703. Tube sleeve; 704. Slot; 705. Second reinforcing rib; 7001. Inner hole of the tube;

[0063] 8. Pipe-holding hydraulic cylinder;

[0064] 9. First connecting pin;

[0065] 10. Second connecting pin;

[0066] 11. Third connecting pin;

[0067] 12. Fourth connecting pin. Detailed Implementation

[0068] A centering device structure with pipe-holding function includes a pipe-holding centering device seat 1 installed on a drilling rig. Two left and right swing bracket seats 2 are symmetrically hinged on the pipe-holding centering device 1. Two left and right swing brackets 3 are hinged on opposite sides of the middle of the two left and right swing bracket seats 2. Two outer clamping plates 4 are installed opposite each other on the two left and right swing brackets 3.

[0069] like Figures 4-7 As shown, when the drilling rig is performing drilling operations, two drilling chucks 5 are installed opposite each other on the two outer clamping plates 4, and a drilling connecting frame 6 is installed between the ends of the two left and right swinging support seats 2 that are away from the pipe holding centering device seat 1.

[0070] like Figures 8-10 As shown, when the drilling rig needs to perform follow-up casing operation, two inner casing clamping plates 7 are installed opposite each other on the two outer clamping plates 4, and a casing clamping cylinder 8 is installed between the ends of the two left and right swinging support seats 2 away from the casing clamping centering device seat 1.

[0071] like Figures 11-13 As shown, the tube clamping centering device 1 includes an upper seat plate 101 and a lower seat plate 102 arranged in parallel. A connecting rib 103 is fixedly arranged between the middle of the upper seat plate 101 and the lower seat plate 102. Two sets of opposing first connecting sleeves 104 and second connecting sleeves 105 are symmetrically arranged on the upper seat plate 101 and the lower seat plate 102. Two sets of reinforcing ribs 106 are symmetrically fixedly arranged at the bottom of the lower seat plate 102.

[0072] like Figures 14-16As shown, each of the left and right swing bracket seats 2 includes two spaced bracket seat plates 201. A third connecting sleeve 202 is provided at one end of both bracket seat plates 201, and a first self-lubricating alloy sleeve 211 is provided inside the third connecting sleeve 202. The third connecting sleeve 202 is hinged to the corresponding first connecting sleeve 1-4 and second connecting sleeve 105 via a first connecting pin 9. Two reinforcing plates 203 are symmetrically fixed between the two bracket seat plates 201. A reinforcing plate 204 is fixedly provided in the middle of the opposite sides of the two bracket seat plates 201, and a coaxial first connecting hole 2001 is formed in the middle of the two reinforcing plates 204. The other ends of the two bracket base plates 201 are provided with a fourth connecting sleeve 205 and a fifth connecting sleeve 206 in sequence. The outer sides of the two bracket base plates 201 near the fourth connecting sleeve 205 and the fifth connecting sleeve 206 are provided with a cylinder connecting base plate 207. The side of the cylinder connecting base plate 207 is symmetrically provided with two connecting plates 208. The two connecting plates 208 near the cylinder connecting base plate 207 are provided with a sixth connecting sleeve 209. The free ends of the two connecting plates 208 are provided with two seventh connecting sleeves 210 facing each other.

[0073] like Figures 17-19 As shown, each of the left and right swing brackets 3 includes a swing base plate 301. Two positioning blocks 302 are symmetrically fixedly arranged on the swing base plate 301 near its end. An upper reinforcing sleeve 303 and a lower reinforcing sleeve 304 are respectively fixedly arranged on the upper and lower surfaces of the middle part of the swing base plate 301 near the corresponding left and right swing bracket seat 2. A second self-lubricating alloy sleeve 305 is provided on both the upper reinforcing sleeve 303 and the lower reinforcing sleeve 304. The second self-lubricating alloy sleeve 305 is hinged to the corresponding first connecting hole 2001 by a second connecting pin 10. A limit block 306 is fixedly arranged at the other end of the middle part of the swing base plate 301.

[0074] like Figures 20-22 As shown, the outer sides of the two outer clamping plates 4 are provided with engaging grooves 401 that are adapted to the swing seat plate 301 along the circumferential direction. The outer sides of the middle part of each outer clamping plate 4 are provided with first limiting grooves 402 that are adapted to the limiting blocks 306 of the corresponding left and right swing brackets 3. The upper end face of the outer clamping plate 4 is a mating end face 403 and is provided with a mating inner hole 404. The two ends of the mating end face 403 are provided with second limiting grooves 405 that are adapted to the inner clamping plate 7 of the tube clamping plate or the inner chuck of the drill hole 5.

[0075] like Figures 23-24As shown, each of the drilling chucks 5 has a first stop 501 on its outer side along the circumferential direction, which is adapted to the mating end face 403 and the mating inner hole 404, and two first dovetails 502 are symmetrically arranged, each adapted to the two second limiting grooves 405. An directional sleeve 503 is provided on the inner side of each drilling chuck 5, and a directional hole 5001 is formed between the two directional sleeves 503 of the two drilling chucks. Multiple first reinforcing ribs 504 are evenly arranged circumferentially on the outer peripheral wall of the directional sleeve 503, and the other ends of the multiple first reinforcing ribs 504 are commonly and fixedly connected to the inner wall of the reinforcing ring 505.

[0076] like Figures 25-26 As shown, each of the drilling connection frames 6 includes an upper connecting plate 601 and a lower connecting plate 602 arranged in parallel, and the upper connecting plate 601 and the lower connecting plate 602 are fixedly connected by a connecting plate 603. Each end of the upper connecting plate 601 and the lower connecting plate 602 has a coaxial second connecting hole 6001, and each second connecting hole 6001 is hinged to the fifth connecting sleeve 206 on the corresponding end of the left and right swing bracket seat 2 by a third connecting pin 11.

[0077] like Figures 27-28 As shown, each of the inner clamping plates 7 has a second stop 701 on its outer side along the circumferential direction, which is adapted to the mating end face 403 and the mating inner hole 404, and two second dovetails 702 are symmetrically arranged, which are adapted to the two second limiting grooves 405 respectively. A clamping sleeve 703 is provided on the inner side of the inner clamping plate 7, and a clamping inner hole 7001 is formed between the two clamping sleeves 703 of the two inner clamping plates 7. The peripheral wall of the clamping inner hole 7001 is uniformly provided with annular or sawtooth grooves 704; and a plurality of second reinforcing ribs 705 are uniformly provided on the outer peripheral wall of the clamping sleeve 703.

[0078] Each of the pipe-holding cylinders 8 is a bidirectional cylinder, and both of its telescopic ends are provided with earring pin holes. The earring pin holes are hinged to the seventh connecting sleeve 210 on the corresponding end of the left and right swing bracket 2 through the fourth connecting pin 12.

[0079] In this embodiment:

[0080] The assembly method of the drilling centering device is as follows:

[0081] Step 1: Use the first connecting pin 9 to pass through the corresponding first connecting sleeve 1-4 and second connecting sleeve 105 to hinge the tube centering device seat 1 and the left and right swing bracket seat 2.

[0082] Step 2: Use the second connecting pin 10 to pass through the corresponding second self-lubricating alloy sleeve 305 and the first connecting hole 2001 to hinge the left and right swing bracket seat 2 and the corresponding left and right swing bracket 3.

[0083] Step 3: Position the outer chuck 4 onto the left and right swing brackets 3 by using the engaging groove 401 on the outer clamping plate 4 that is compatible with the swing seat plate 301 and the first limiting groove 402 that is compatible with the limiting block 306 of the corresponding left and right swing brackets 3.

[0084] Step 4: Position the drilling chuck 5 by using the first stop 501 that matches the mating end face 403 and mating inner hole 404 on the inner chuck 5 and the first dovetail 502 that matches the second limiting groove 405, and install the drilling chuck 5 onto the outer clamping plate 4.

[0085] Step 5: Use the third connecting pin 11 to pass through the second connecting hole 6001 on the drilling rig connecting frame and the fifth connecting sleeve 206 on the two left and right swing bracket seats 2 respectively, and connect the drilling connecting frame 6 and the two left and right swing bracket seats 2 together.

[0086] The assembly method for the pipe clamp is as follows:

[0087] Step 1: Use the first connecting pin 9 to pass through the corresponding first connecting sleeve 1-4 and second connecting sleeve 105 to hinge the tube centering device seat 1 and the left and right swing bracket seat 2.

[0088] Step 2: Use the second connecting pin 10 to pass through the corresponding second self-lubricating alloy sleeve 305 and the first connecting hole 2001 to hinge the left and right swing bracket seat 2 and the corresponding left and right swing bracket 3.

[0089] Step 3: Position the outer chuck 4 onto the left and right swing brackets 3 by using the engaging groove 401 on the outer clamping plate 4 that is compatible with the swing seat plate 301 and the first limiting groove 402 that is compatible with the limiting block 306 of the corresponding left and right swing brackets 3.

[0090] Step 4: Position the inner clamping plate 7 onto the outer clamping plate 4 using the second stop 701 on the inner clamping plate 7 that is adapted to the mating end face 403 and the mating inner hole 404, and the second dovetail 702 that is adapted to the second limiting groove 405.

[0091] Step 5: Connect the pipe-holding cylinder 8 and the left and right swing bracket seat 2 together by passing the fourth connecting pin 12 through the ear pin holes at both ends of the pipe-holding cylinder 8 and the seventh connecting sleeve 210 on the left and right swing bracket 2.

[0092] The specific working method of this invention is as follows:

[0093] During normal drilling operations, the centering device is in the drilling centering device state, and the drill rod performs centering drilling operations through the centering hole 5001, which is consistent with the requirements of the construction drill rod, via the chuck 5 inside the borehole.

[0094] When it is necessary to follow up on the construction process of the casing, pull out the third connecting pin 11 and remove the drilling connecting bracket 6 from the left and right swing bracket seat 2.

[0095] Then remove the chuck 5 inside the borehole and install the inner clamp 7 that is compatible with the casing.

[0096] Use the fourth connecting pin 12 to connect the pipe-holding cylinder 8 and the left and right swing bracket seat 2 together.

[0097] When oil enters the large chamber of the hydraulic cylinder, the piston rod extends, and the left and right swing bracket 2 drives the left and right swing bracket 3, the outer clamping plate 4, and the inner clamping plate 7 of the tube to swing outward around the first connecting pin 9, ensuring that the sleeve can easily pass through the center of the centerer.

[0098] Then oil enters the small chamber of the cylinder, the piston rod retracts, and the left and right swing bracket 2 drives the left and right swing bracket 3, the outer clamping plate 4, and the inner clamping plate 7 of the tube to swing around the first connecting pin 9 toward the center of the centerer.

[0099] When the inner clamp 7 of the casing contacts the casing, the inner clamp 7 drives the outer clamp 4, which in turn drives the left and right swing bracket 3 to swing around the second connecting pin 10, achieving the effect of automatic centering and positioning the casing at the center of the drill pipe.

[0100] At this point, the piston rod of the micro-motion cylinder allows the casing to slide naturally to the ground, and then casing follow-up construction can begin. Due to the casing holding function of this structure, the centering and positioning of the casing is ensured during the drilling process, which effectively guarantees the straightness after casing docking and the coaxiality of the casing and drill rod during construction, greatly improving the construction accuracy of casing drilling.

[0101] After drilling is completed, the casings need to be removed one by one. When the casing is raised to an appropriate height, the lifting is stopped. Then, oil is introduced into the small chamber of the hydraulic cylinder, and the piston rod retracts, allowing the multiple annular or sawtooth grooves 704 on the inner clamping plate 7 of the casing to contact the casing. By adjusting the oil inlet pressure (i.e., the clamping force of the clamping sleeve 703 on the casing), the clamping effect on the casing is achieved (while preventing the casing from being clamped and deformed). At this time, the upper casing can be removed to prevent the lower casing from falling into the hole. By repeating the process, all casings can be removed.

[0102] This invention solves the problems of poor straightness after casing connection, coaxiality of casing and drill pipe during construction, and the risk of lower casing falling off when casing is removed sequentially. At the same time, it can change the construction method in a timely and convenient manner according to construction needs, so as to achieve the effects of convenience, speed, improved production efficiency and reduced labor intensity.

[0103] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A centering device structure with a tube-holding function, characterized in that: It includes a pipe gripping centering device seat installed on a drilling rig, on which two left and right swing bracket seats are symmetrically hinged, and two left and right swing brackets are hinged at the middle of the two left and right swing bracket seats, and two outer clamping plates are arranged opposite each other on the two left and right swing brackets. When the drilling rig is drilling, two drilling chucks are arranged opposite each other on the two outer clamps, and a drilling connecting frame is arranged between the ends of the two left and right swing brackets that are away from the pipe holding centerer. When the drilling rig needs to perform follow-up casing installation, two inner casing clamps are provided opposite to each other on the two outer clamps, and a casing clamping cylinder is provided between the ends of the two left and right swing brackets that are away from the casing clamping centering device. The tube clamping centering device includes an upper seat plate and a lower seat plate arranged in parallel. A connecting rib is fixedly arranged between the middle of the upper seat plate and the lower seat plate. Two sets of opposing first connecting sleeves and second connecting sleeves are symmetrically arranged on the upper seat plate and the lower seat plate. Two sets of reinforcing ribs are symmetrically fixedly arranged at the bottom of the lower seat plate. Each of the left and right swing brackets includes two spaced bracket plates. A third connecting sleeve is provided at one end of each bracket plate. The third connecting sleeve is hinged to the corresponding first and second connecting sleeves via a first connecting pin. Two reinforcing plates are symmetrically fixed between the two bracket plates. A supplementary reinforcing plate is fixedly provided at the middle of the opposite sides of each of the two bracket plates. A coaxial first connecting hole is formed in the middle of the two supplementary reinforcing plates. A fourth connecting sleeve and a fifth connecting sleeve are sequentially provided at the other end of each of the two bracket plates. A cylinder connecting plate is fixedly provided on the outer side of each of the two bracket plates near the fourth and fifth connecting sleeves. Two connecting plates are symmetrically fixed on the side of the cylinder connecting plate. A sixth connecting sleeve is provided on the part of each of the two connecting plates near the cylinder connecting plate. Two seventh connecting sleeves are provided opposite each other at the free ends of the two connecting plates. Each of the left and right swing brackets includes a swing base plate. Two positioning blocks are symmetrically arranged on the swing base plate near the end. An upper reinforcing sleeve and a lower reinforcing sleeve are respectively fixedly arranged on the upper and lower surfaces of the middle part of the swing base plate near one end of the corresponding left and right swing bracket seat. A second self-lubricating alloy sleeve is provided on both the upper and lower reinforcing sleeves. The second self-lubricating alloy sleeve is hinged to the corresponding first connecting hole by a second connecting pin. A limit block is fixedly arranged at the other end of the middle part of the swing base plate. Each of the outer clamping plates has a locking groove on its outer side along the circumferential direction that is adapted to the swing seat plate. The outer side of the middle part of each of the outer clamping plates has a first limiting groove adapted to the limiting block of the corresponding left and right swing bracket. The upper end face of the outer clamping plate is a mating end face and has a mating inner hole. The two ends of the mating end face have a second limiting groove adapted to the inner clamping plate of the tube or the inner chuck of the drill hole.

2. The centering device structure with tube-holding function according to claim 1, characterized in that: The third connecting sleeve is internally provided with a first self-lubricating alloy sleeve.

3. The centering device structure with tube-holding function according to claim 1, characterized in that: Each of the aforementioned drilling chucks has a first stop on its outer side along the circumferential direction, which is adapted to the mating end face and the mating inner hole, and two first dovetails are symmetrically arranged, which are adapted to the two second limiting grooves respectively; an directional sleeve is provided on the inner side of the drilling chuck, and a directional hole is formed between the two directional sleeves of the two drilling chucks; a plurality of first reinforcing ribs are uniformly arranged on the outer circumferential wall of the directional sleeve, and the other end of the plurality of first reinforcing ribs is fixedly connected to the inner wall of the reinforcing ring.

4. The centering device structure with tube-holding function according to claim 3, characterized in that: The drilling connection frame includes an upper connection plate and a lower connection plate arranged in parallel. The upper connection plate and the lower connection plate are fixedly connected by a connecting plate. The two ends of the upper connection plate and the lower connection plate are respectively provided with coaxial second connection holes. Each second connection hole is hinged to the fifth connection sleeve on the left and right swing bracket at the corresponding end by a third connection pin.

5. The centering device structure with tube-holding function according to claim 1, characterized in that: Each of the inner clamping plates has a second stop along the circumferential direction on its outer side, which is adapted to the mating end face and the mating inner hole, and two second dovetails adapted to the two second limiting grooves are symmetrically arranged; a clamping sleeve is provided on the inner side of the inner clamping plate, and a clamping inner hole is formed between the two clamping sleeves of the two inner clamping plates, and annular or serrated grooves are uniformly arranged on the peripheral wall of the clamping inner hole; a plurality of second reinforcing ribs are uniformly arranged on the outer peripheral wall of the clamping sleeve.

6. The centering device structure with tube-holding function according to claim 5, characterized in that: Each of the aforementioned pipe-holding cylinders is a bidirectional cylinder, and both of its telescopic ends are provided with earring pin holes. The earring pin holes are hinged to the seventh connecting sleeve on the left and right swing brackets at the corresponding ends via a fourth connecting pin.

Images