A multi-stage variable-diameter stabilizing device and method

Abstract

The application discloses a kind of multistage variable-diameter stabilizing device and method, belong to drilling tool technical field, comprising: outer cylinder, the outer cylinder is hollow structure;Inner cylinder, the inner cylinder is located in the hollow structure of the outer cylinder, the inner cylinder is hollow structure;Passage control mechanism, the passage control mechanism is connected with inner cylinder and is communicated inside, for adjusting the passing state of grouting liquid;Steering mechanism, the steering mechanism is located between outer cylinder and inner cylinder;Righting mechanism, the righting mechanism is connected with steering mechanism and outer cylinder, the righting mechanism is used for opening to right in the process of going up to carry out righting after steering mechanism steering.The application realizes the technical effect of multistage variable-diameter by adjusting the diameter of righting block opening.

Description

Technical Field

[0001] This invention relates to the field of drilling tool technology, and more specifically to a multi-stage variable diameter stabilizing device and method. Background Technology

[0002] Stabilizers (also known as centralizers) are typically used in directional wells for oil and gas drilling. The outer diameter of the centralizer is adjusted according to the needs of the site, thereby increasing, stabilizing, or decreasing the inclination during directional drilling.

[0003] Centralizers can be structurally divided into integral and variable diameter types. Integral centralizers are simple in structure and low in cost, but they can only be used once and cannot be reused, resulting in significant waste. Most importantly, in the event of a downhole accident, the connection point of the centralizer is particularly prone to stuck pipe. Variable diameter centralizers, on the other hand, can solve the problem of replacing worn centralizing parts and controlling the opening and retraction of the centralizing blocks as needed during tripping and drilling, greatly reducing drilling risks. However, existing variable diameter centralizers have problems such as complex structure, short lifespan, and high cost. Furthermore, existing variable diameter centralizers can usually only achieve one or two mechanical diameter changes and cannot achieve multiple diameter changes. Summary of the Invention

[0004] To address the above problems, the present invention provides a first aspect of a multi-stage variable diameter stabilizing device, comprising:

[0005] The outer cylinder is a hollow structure.

[0006] An inner cylinder is disposed within the hollow structure of the outer cylinder, and the inner cylinder is a hollow structure.

[0007] A channel control mechanism, which is connected to and internally communicates with the inner cylinder, is used to adjust the flow state of the grouting fluid.

[0008] A steering mechanism is provided between the outer cylinder and the inner cylinder;

[0009] The straightening mechanism is connected to the steering mechanism and the outer cylinder. After being turned by the steering mechanism, the straightening mechanism is used to open up during the upward movement to straighten the cylinder.

[0010] Optionally, the channel control mechanism includes:

[0011] A channel control pipe, which is connected to and internally communicates with the inner cylinder;

[0012] First spring,

[0013] A support tube, wherein the first spring is disposed in the support tube and is connected to the channel control tube.

[0014] Optionally, the middle part of the channel control tube is provided with a ball discharge port and a first locking part that cooperates with the ball discharge port. The first locking part cooperates with the inner wall of the inner cylinder to adjust the position of the steel ball.

[0015] The channel control tube is also provided with a plurality of first through holes on the same horizontal line, the first through holes being located above the ball discharge port;

[0016] The inner cylinder is provided with a third through hole and a fourth through hole from high to low, wherein the third through hole and the fourth through hole are both located below the first through hole;

[0017] The gap between the outer cylinder and the inner cylinder located above the support tube is the ball disposal cavity.

[0018] Optionally, the steering mechanism includes:

[0019] Steering control tube, which is sleeved with the inner cylinder;

[0020] Steering piston, which is sleeved with the steering control tube;

[0021] Steering pin, which is connected to the steering piston;

[0022] The second spring is disposed in the steering piston and sleeved on the outer periphery of the steering control tube.

[0023] Optionally, there is a gap between the steering control pipe and the inner cylinder, and the gap between the steering control pipe and the inner cylinder is a third grouting channel;

[0024] The steering control tube is provided with a fifth through hole;

[0025] The steering piston has a fourth locking part in the middle of its inner side, the steering pin is connected to the fourth locking part, and the fourth locking part abuts against the top of the second spring;

[0026] There is a gap between the outer cylinder and the steering piston, wherein the gap between the outer cylinder and the steering piston is the first piston chamber;

[0027] There is a gap between the steering piston and the steering control tube, wherein the gap above the fourth locking part is the second piston chamber, and the gap below the fourth locking part is the third piston chamber;

[0028] The second piston chamber is connected to the third grouting channel via the fifth through hole;

[0029] There is a gap between the outer cylinder and the steering piston, and the gap between the outer cylinder and the steering piston is the fourth grouting channel.

[0030] Optionally, the steering mechanism further includes:

[0031] A closed tube, the bottom of which has an opening and is sleeved with the outer cylinder, is used to close the first piston chamber;

[0032] The fifth grouting channel is located at the top of the second piston chamber and is used to connect the second piston chamber with the fourth grouting channel.

[0033] Optionally, a steering slide is provided on the outer wall of the steering control tube, and the steering slide is used to connect with the steering pin to enable the steering control tube to turn;

[0034] The steering slide includes two sets of vertically arranged sliding sections, and a steering section located between the sliding sections;

[0035] The steering section is tilted;

[0036] The steering pin in the steering piston can only move up and down, not rotate.

[0037] Optionally, the righting mechanism includes:

[0038] The first adjusting sleeve is connected to the outer cylinder.

[0039] The second adjusting sleeve is adapted to the first adjusting sleeve and is connected to the steering control tube;

[0040] The third spring, the two ends of which are respectively connected to the first adjusting sleeve and the second adjusting sleeve;

[0041] A straightening component, which is connected to a second adjusting sleeve;

[0042] The first adjusting sleeve has multiple adjusting slots;

[0043] The second adjusting sleeve is provided with multiple adjusting keys, which are adapted to the adjusting groove.

[0044] Optionally, the straightening component includes a straightening block, a straightening key disposed on the straightening block, and limiting seats respectively connected to the top and bottom of the straightening block;

[0045] The limiting seat includes a first limiting seat and a second limiting seat, which are respectively connected to the top and bottom of the straightening block. The first limiting seat is rotatably connected to the second adjusting sleeve.

[0046] The second limiting seat is connected to the closed tube;

[0047] The center of the straightening block is provided with a raised straightening key;

[0048] The outer cylinder is provided with a straightening opening that is adapted to the straightening block;

[0049] The center of the straightening opening is provided with an inclined groove, which is a straightening groove. The straightening groove is adapted to the straightening key so that the straightening block opens when it moves upward.

[0050] A second aspect of the present invention provides a multi-stage variable diameter stabilization method, which uses the multi-stage variable diameter stabilization device described in the above scheme for stabilization, and includes the following steps:

[0051] S1. Steel balls are inserted into the inner cylinder. The steel balls enter the second grouting channel through the first grouting channel and block the second grouting channel after contacting the first locking part.

[0052] S2. Drilling fluid is added to the first grouting channel. The drilling fluid accumulates in the second grouting channel. The first spring is compressed. The channel control pipe descends to the point where the first through hole and the third through hole are aligned.

[0053] S3. Drilling fluid enters the third grouting channel through the first and third through holes, and then enters the second piston chamber through the fifth through hole;

[0054] S4. The drilling fluid entering the second piston chamber presses downwards against the fourth locking part, and the steering pin moves downwards with the fourth locking part. The steering pin cooperates with the steering slide to make the steering control tube and the second adjusting sleeve connected to the steering control tube turn.

[0055] S5. Continue to add drilling fluid to the first grouting channel. The drilling fluid continues to accumulate in the second grouting channel. The first spring continues to be compressed. The channel control pipe descends to the alignment of the first through hole and the fourth through hole. The drilling fluid enters the third piston chamber through the first through hole and the fourth through hole.

[0056] S6. Drilling fluid enters the third piston chamber and squeezes the fourth locking part upward. The fourth locking part moves upward, and the steering pin moves upward with the fourth locking part. The steering pin cooperates with the steering slide to make the steering control tube and the second adjusting sleeve connected to the steering control tube turn, aligning the adjusting groove of the first adjusting sleeve with the adjusting key of the second adjusting sleeve.

[0057] S7. Drilling fluid continues to be added to the first grouting channel. The drilling fluid accumulates in the second grouting channel. The first spring continues to be compressed. The channel control pipe continues to descend until the inner wall of the inner cylinder loses its sealing effect on the channel control pipe. The drilling fluid enters the ball disposal chamber and flows into the first piston chamber through the fourth grouting channel. An upward hydraulic pressure is applied to the sealing pipe. When the hydraulic pressure is greater than the restoring force of the third spring, it pushes the second limit seat and the straightening block to move upward, and the straightening block opens.

[0058] By adopting the above technical solution, the present invention mainly has the following technical effects:

[0059] By setting a channel control mechanism to adjust the flow state of the grouting fluid, the drilling fluid accumulation steering pin drives the steering control pipe for steering, and the steering control pipe drives the second adjusting sleeve for steering, so that the adjusting key of the second adjusting sleeve is aligned with the adjusting groove of the first adjusting sleeve. The hydraulic pressure of the drilling fluid pushes the centralizing block to open during the upward movement, so as to realize the centralizing effect of the centralizer. On the other hand, by adjusting the depth of the adjusting groove in the first adjusting sleeve and adjusting the length of the adjusting key in the second adjusting sleeve, the upward distance of the centralizing block is adjusted. By adjusting the opening diameter of the centralizing block, the technical effect of multi-stage diameter change is achieved. Attached Figure Description

[0060] Figure 1 This is a schematic diagram of the structure of a multi-stage variable diameter stabilizing device (Embodiment 1) according to the present invention;

[0061] Figure 2 This is a schematic diagram of the structure of a multi-stage variable diameter stabilizing device according to the present invention (from another perspective);

[0062] Figure 3 for Figure 2 Enlarged view of section A;

[0063] Figure 4 for Figure 2 Enlarged view of section B;

[0064] Figure 5 for Figure 4 Enlarged view of section C;

[0065] Figure 6 This is a schematic diagram showing the relative positions of the first adjusting sleeve and the second adjusting sleeve in a multi-stage variable diameter stabilizing device according to the present invention.

[0066] Figure 7 This is a schematic diagram of the structure of a multi-stage variable diameter stabilizing device (another state) according to the present invention;

[0067] Figure 8 for Figure 7 Enlarged view of section D;

[0068] Figure 9 This is a schematic diagram showing the relative positions of the first adjusting sleeve and the second adjusting sleeve (in another state) in a multi-stage variable diameter stabilizing device of the present invention.

[0069] Figure 10 This is a schematic diagram of the structure of a multi-stage variable diameter stabilizing device (another state) according to the present invention;

[0070] Figure 11 for Figure 10Enlarged view of section E in the middle;

[0071] Figure 12 This is a schematic diagram showing the relative positions of the first adjusting sleeve and the second adjusting sleeve (in another state) in a multi-stage variable diameter stabilizing device of the present invention.

[0072] Figure 13 This is a schematic diagram of the structure of a multi-stage variable diameter stabilizing device (other states) according to the present invention;

[0073] Figure 14 This is a schematic diagram of the drilling fluid flow channel of a multi-stage variable diameter stabilizing device (when the centralizing block is deployed) according to the present invention;

[0074] Figure 15 This is an exploded structural diagram of a multi-stage variable diameter stabilizing device according to the present invention;

[0075] Figure 16 This is a schematic diagram of the structure of a multi-stage variable diameter stabilizing device (Example 3) of the present invention.

[0076] The meanings of the reference numerals in the attached figures are as follows:

[0077] 1. Outer cylinder; 11. Straightening inlet; 111. Straightening groove; 12. Ball disposal chamber; 13. Sixth grouting channel;

[0078] 2. Inner cylinder; 21. First grouting channel; 22. Third through hole; 23. Fourth through hole; 24. Sixth through hole; 25. Seventh through hole; 26. Eighth through hole; 27. Ninth through hole; 28. Fourth piston chamber;

[0079] 3. Channel control mechanism; 31. Channel control pipe; 311. Second grouting channel; 312. Ball discharge port; 313. First locking part; 314. First through hole; 315. Second locking part; 32. Support pipe; 321. Second through hole; 33. First spring;

[0080] 4. Steering mechanism; 41. Steering control pipe; 411. Third grouting channel; 412. Fifth through hole; 413. Steering slide; 4131. Sliding section; 4132. Steering section; 42. Steering piston; 421. Fourth locking part; 422. Fifth locking part; 43. Steering pin; 44. Second spring; 45. First piston chamber; 451. Sealing pipe; 46. Second piston chamber; 461. Fifth grouting channel; 47. Third piston chamber; 48. Fourth grouting channel;

[0081] 5. Straightening mechanism; 51. First adjusting sleeve; 511. Adjusting groove; 512. Sixth locking part; 52. Second adjusting sleeve; 521. Adjusting key; 522. Seventh locking part; 53. Third spring; 54. Straightening assembly; 541. Straightening block; 542. Straightening key; 543. Limiting seat; 5431. First limiting seat; 5432. Second limiting seat. Detailed Implementation

[0082] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. 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.

[0083] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. Example

[0084] Please see Figures 1-15 The first aspect of this invention provides a multi-stage variable diameter stabilizing device. In practical application, this device is installed in a directional well and includes an outer cylinder 1, an inner cylinder 2 disposed within the outer cylinder 1, a channel control mechanism 3 connected to the inner cylinder 2, a steering mechanism 4 connected to the channel control mechanism 3, and a straightening mechanism 5 connected to the outer cylinder 1. It should be noted that in this embodiment, the axial direction refers to the direction of the cylinder's rotational center axis, i.e., the direction common to the center axis.

[0085] Furthermore, the outer cylinder 1 is a cylindrical hollow structure, the hollow part of which is used to accommodate the components disposed in the outer cylinder 1, and the outer cylinder 1 has a certain mechanical strength and rigidity, which can prevent mechanical collision damage to the internal structure of the stabilizing device, thereby playing a good protective role.

[0086] Further, please refer to Figure 2 and Figure 4 The inner cylinder 2 is located in the hollow structure of the outer cylinder 1. The inner cylinder 2 is a hollow tubular structure, and its hollow part is the first grouting channel 21.

[0087] Further, please refer to Figures 2-4The channel control mechanism 3 is located in the hollow structure of the outer cylinder 1 and connected to the bottom of the inner cylinder 2. It is used to adjust the flow state of the grouting fluid in the multi-stage variable diameter stabilizing device. Specifically, the channel control mechanism 3 includes a channel control pipe 31, a support pipe 32 connected to the channel control pipe 31, and a first spring 33 located in the support pipe 32. The channel control pipe 31 is hollow, and its hollow part is the second grouting channel 311. The channel control pipe 31 is connected to the inner cylinder 2 and has internal communication, that is, the second grouting channel 311 is connected to the first grouting channel 21.

[0088] In a preferred embodiment, the inner diameter of the channel control pipe 31 is the same as the inner diameter of the inner cylinder 2. Specifically, the bottom of the inner cylinder 2 is provided with a cavity that is adapted to the channel control pipe 31. The inner cylinder 2 and the channel control pipe 31 are connected and internally communicated by fitting the inner cylinder 2 and the channel control pipe 31 together.

[0089] Furthermore, the channel control tube 31 has a notch in the middle, which is a ball discharge port 312. On the other hand, the channel control tube 31 has a protrusion in the middle that cooperates with the ball discharge port 312. The protrusion in the middle of the channel control tube 31 is a first locking part 313. The first locking part 313 cooperates with the inner wall of the inner cylinder 2 to adjust the position of the steel ball. Specifically, when the inner cylinder 2 is sleeved with the channel control tube 31, due to the sealing effect of the inner wall of the inner cylinder 2, the steel ball put into the inner cylinder 2 will be locked in the channel control tube 31 under the action of the locking part 313 and the inner wall of the inner cylinder 2. When the inner wall of the inner cylinder 2 loses its sealing effect on the channel control tube 31 and the ball discharge port 312 is exposed, the steel ball put into the inner cylinder 2 can leave the channel control tube 31 through the ball discharge port 312.

[0090] Furthermore, the channel control tube 31 has multiple first through holes 314 located above the ball discharge port 312, wherein the multiple first through holes 314 are on the same horizontal line. On the other hand, the bottom of the channel control tube 31 is also provided with an annular protrusion, which is a second locking part 315. The second locking part 315 is connected to the outer periphery of the channel control tube 31 and abuts against the top of the first spring 33. By placing the first spring 33 in the support tube 32 and connecting the support tube 32 to the outer cylinder 1, the channel control tube 31 is placed in the outer cylinder 1.

[0091] Furthermore, the support tube 32 is a hollow cylindrical structure with an opening at the top, and its bottom is provided with a second through hole 321 through which the channel control tube 31 can pass. By connecting the support tube 32 to the outer cylinder 1, the channel control tube 31 is supported by the support tube 32 and the first spring 33. On the other hand, by providing the second through hole 321 at the bottom of the support tube 32, the channel control tube 31 can reciprocate along the axial direction on the first spring 33 under the action of external force.

[0092] Furthermore, the inner cylinder 2 is provided with a third through hole 22 and a fourth through hole 23 from high to low, wherein the third through hole 22 and the fourth through hole 23 are both located below the first through hole 314. On the other hand, there is a gap between the outer cylinder 1 and the inner cylinder 2, wherein the gap located above the support tube 32 is the ball disposal cavity 12.

[0093] Please see Figures 2-5 The steering mechanism 4 is located between the outer cylinder 1 and the inner cylinder 2, and includes a steering control pipe 41, a steering piston 42, a steering pin 43 connected to the steering piston 42, and a second spring 44 located in the steering piston 42. The steering control pipe 41 is sleeved on the outer periphery of the inner cylinder 2. Specifically, the outer wall of the inner cylinder 2 is provided with an annular protrusion, which is the third locking part 24. By sleeved with the third locking part 24, the steering control pipe 41 is sleeved with the inner cylinder 2. It can be understood that by setting the third locking part 24 to sleeve with the steering control pipe 41, there is a gap between the steering control pipe 41 and the inner cylinder 2 below the third locking part 24. The gap is the third grouting channel 411. On the other hand, the steering control pipe 41 is also provided with a fifth through hole 412 in the middle, which is located below the third locking part 24.

[0094] Furthermore, the steering piston 42 has a hollow structure, with its hollow portion sleeved with the steering control tube 41. The steering piston 42 has annular protrusions at its center and bottom. The annular protrusion at the center of the steering piston 42 is the fourth locking part 421, and the annular protrusion at the bottom is the fifth locking part 422. The fifth locking part 422 is fixedly connected to the bottom of the steering piston 42 to support the second spring 44. The fourth locking part 421 is sleeved with the steering control tube 41 and is movably disposed within the steering piston 42, with its bottom abutting against the top of the second spring 44. The fifth through hole 412 is located above the fourth locking part 421.

[0095] Furthermore, the top of the steering piston 42 has a stepped structure. By connecting the outer cylinder 1 to the steering piston 42 and by connecting the fourth locking part 421 to the steering control pipe 41, there are gaps between the outer cylinder 1 and the steering piston 42, and between the steering piston 42 and the steering control pipe 41. The gap between the outer cylinder 1 and the steering piston 42 located above the steering piston 42 is the first piston chamber 45. The gap between the steering piston 42 and the steering control pipe 41 located above the fourth locking part 421 is the second piston chamber 46. The gap between the steering piston 42 and the steering control pipe 41 located below the fourth locking part 421 is the third piston chamber 47. By opening a fifth through hole 412 on the steering control pipe 41, the third grouting channel 411 is connected to the second piston chamber 46. On the other hand, in order to keep the top of the first piston chamber 45 closed, the top of the first piston chamber 45 is also provided with a sealing tube 451. The top center of the sealing tube 451 is provided with a through hole through which the inner cylinder 2 can pass, and the bottom is provided with an opening. The sealing tube 451 is sleeved with the outer cylinder 1 to seal the first piston chamber 451.

[0096] It is understood that there is a gap between the outer cylinder 1, which is sleeved on the outer periphery of the steering piston 42, and the steering piston 42. The gap is the fourth grouting channel 48. It should be noted that the connection relationship between the outer cylinder 1 and the steering piston 42 can be explained by opening a groove on the outer cylinder 1 and setting a key on the steering piston 42 to connect the outer cylinder 1 and the steering piston 42 by keyway. At the same time, the first piston chamber 45 and the ball discarding chamber 12 can be connected by opening a through hole on the key.

[0097] It should be noted that further reading is required. Figure 8 The top of the second piston chamber 46 is provided with a fifth grouting channel 461. By setting the fifth grouting channel 461, the second piston chamber 46 is connected to the fourth grouting channel 48, so that when the closed pipe 451 rises, the drilling fluid in the second piston chamber 46 can leave the second piston chamber 46 through the fifth grouting channel 461.

[0098] Please see Figure 5 and Figure 6 The steering pin 43 is disposed on the fourth locking part 421 and is used to turn the steering control tube 41. Specifically, the outer wall of the steering control tube 41 is provided with a steering slide 413. The steering slide 413 is used to connect with the steering pin 43 to turn the steering control tube 41. The turning process will be further described below.

[0099] Please refer to further information. Figure 6The steering slide 413 includes two sets of vertically arranged sliding sections 4131 and a steering section 4132 disposed between the sliding sections 4131, wherein the steering section 4132 is inclined. It is understood that the steering pin 43 disposed in the steering piston 42 can only move up and down and cannot rotate. For example, the fourth locking part 421 is connected to the inner wall of the steering piston 42 by a keyway connection. By connecting the steering pin 43 to the steering slide 413, the steering pin 43 slides on the steering slide 413. The design of the steering pin 43, which can only move up and down and cannot rotate, allows the steering control tube 41 to turn when passing through the steering section 4132.

[0100] Please see Figure 2 , Figure 3 and Figure 15 The straightening mechanism 5 is connected to the steering mechanism 4. After being turned by the steering mechanism 4, the straightening mechanism 5 is used to open up and straighten during the upward movement. Specifically, the straightening mechanism 5 includes a first adjusting sleeve 51, a second adjusting sleeve 52 that cooperates with the first adjusting sleeve 51, a third spring 53 that is connected to the second adjusting sleeve 52, and a straightening component 54 that is connected to the second adjusting sleeve 52. The first adjusting sleeve 51 is a hollow tubular structure that is connected to the outer cylinder 1 through a sleeve. The bottom of the first adjusting sleeve 51 is regularly provided with a plurality of concave adjusting grooves 511.

[0101] Furthermore, the second adjusting sleeve 52 is also a hollow tubular structure. Multiple protruding adjusting keys 521 are regularly spaced on the top of the second adjusting sleeve 52, and the shape of the adjusting keys 521 is adapted to the adjusting groove 511. Specifically, the second adjusting sleeve 52 can be connected to the first adjusting sleeve 51 by inserting the adjusting keys 521 into the adjusting groove 511, or the second adjusting sleeve 52 can be connected to the first adjusting sleeve 51 by abutting the adjusting keys 521 against the non-recessed part of the bottom of the first adjusting sleeve 51.

[0102] Furthermore, the top of the first adjusting sleeve 51 and the bottom of the second adjusting sleeve 52 are provided with matching annular protrusions, namely the sixth locking part 512 and the seventh locking part 522, respectively. By abutting the two ends of the third spring 53 with the sixth locking part 512 and the seventh locking part 522, the third spring 53 is connected to the first adjusting sleeve 51 and the second adjusting sleeve 52, and the third spring 53 is sleeved on the outer periphery of the inner cylinder 2. On the other hand, the second adjusting sleeve 52 is connected to the steering control pipe 41, so that the steering control pipe 41 can be used to drive the second adjusting sleeve 52 to turn.

[0103] Please see Figure 3 , Figure 4 and Figure 15The straightening assembly 54 includes a straightening block 541, a straightening key 542 disposed on the straightening block 541, and limiting seats 543 respectively connected to the top and bottom of the straightening block 541. The limiting seats 543 include a first limiting seat 5431 and a second limiting seat 5432, which are respectively connected to the top and bottom of the straightening block 541. The first limiting seat 5431 is rotatably connected to a second adjusting sleeve 52. Specifically, the second adjusting sleeve 52 can rotate within the first limiting seat 5431 and can rise or fall with the first limiting seat 5431. On the other hand, the second limiting seat 5432 is connected to the top of the closed tube 451.

[0104] Furthermore, the center of the straightening block 541 is provided with a strip-shaped protrusion, which is an inclined straightening key 542. On the other hand, the outer cylinder 1 is provided with a square notch that matches the straightening block 541. The notch on the outer cylinder 1 is a straightening opening 11. The center of the straightening opening 11 is provided with an inclined groove, which is a straightening groove 111. The straightening groove 111 matches the straightening key 542, so that when the straightening block 541 rises, it will rise along the setting direction of the straightening groove 111, thereby realizing the opening process of the straightening block 541.

[0105] Example 2

[0106] A second aspect of the present invention provides a multi-stage variable diameter stabilization method, which includes the following steps in the stabilization process:

[0107] S1. Steel balls are inserted into the inner cylinder 2. The steel balls enter the second grouting channel 311 through the first grouting channel 21 and block the second grouting channel 311 after contacting the first locking part 313.

[0108] S2. Drilling fluid is added to the first grouting channel 21. The drilling fluid accumulates in the second grouting channel 311. The first spring 33 is compressed. The channel control pipe 31 descends to the first through hole 314 and aligns with the third through hole 22.

[0109] S3. Drilling fluid enters the third grouting channel 411 through the first through hole 314 and the third through hole 22, and then enters the second piston chamber 46 through the fifth through hole 412.

[0110] S4. The drilling fluid entering the second piston chamber 46 presses down into the fourth locking part 421. The steering pin 43 moves downward with the fourth locking part 421. The steering pin 43 cooperates with the steering slide 413 to make the steering control tube 41 and the second adjusting sleeve 52 connected to the steering control tube 41 turn.

[0111] S5. Continue to add drilling fluid to the first grouting channel 21. The drilling fluid continues to accumulate in the second grouting channel 311. The first spring 33 continues to be compressed. The channel control pipe 31 descends to the first through hole 314 and the fourth through hole 23 are aligned. The drilling fluid enters the third piston chamber 47 through the first through hole 314 and the fourth through hole 23.

[0112] S6. Drilling fluid enters the third piston chamber 47 and pushes the fourth locking part 421 upward. The fourth locking part 421 moves upward, and the steering pin 43 moves upward with the fourth locking part 421. The steering pin 43 cooperates with the steering slide 413 to make the steering control pipe 41 and the second adjusting sleeve 52 connected to the steering control pipe 41 turn, and align the adjusting groove 511 of the first adjusting sleeve 51 with the adjusting key 521 of the second adjusting sleeve 52.

[0113] S7. Drilling fluid is added to the first grouting channel 21. The drilling fluid accumulates in the second grouting channel 311. The first spring 33 continues to be compressed. The channel control pipe 31 continues to descend until the inner wall of the inner cylinder 2 loses its sealing effect on the channel control pipe 31. After the drilling fluid enters the ball disposal chamber 12, it flows into the first piston chamber 45 through the fourth grouting channel 48. An upward hydraulic pressure is applied to the sealing pipe 451. When the hydraulic pressure is greater than the restoring force of the third spring 53, it pushes the second limit seat 5432 and the straightening block 541 to move upward. The straightening block 541 opens.

[0114] It should be noted here that you would like to refer to [link / reference]. Figure 14 There is also a gap between the support pipe 32 and the outer cylinder 1, which is the sixth grouting channel 13. After the sixth grouting channel 13 is set, the drilling fluid leaving the support pipe 32 can enter the ball disposal chamber 12 through the sixth grouting channel 13, and then enter the first piston chamber 45 through the fourth grouting channel 48, applying upward hydraulic pressure to the closed pipe 451. On the other hand, the inner cylinder 2 is provided with a sixth through hole 24, which connects the first grouting channel 21 and the ball disposal chamber 12, so that the drilling fluid can enter the ball disposal chamber 12.

[0115] It is understandable that by adjusting the depth of the adjustment groove 511 in the first adjustment sleeve 51 and adjusting the length of the adjustment key 521 in the second adjustment sleeve 52, the upward distance of the straightening block 541 can be adjusted. By adjusting the upward distance of the straightening block 541, the opening diameter of the straightening block 541 can be adjusted, thereby realizing the multi-stage diameter change process of the stabilizing device.

[0116] Example 3

[0117] Please see Figure 16A third aspect of the present invention provides a multi-stage variable diameter stabilizing device, comprising an outer cylinder 1, an inner cylinder 2 disposed within the outer cylinder 1, a channel control mechanism 3 connected to the inner cylinder 2, a steering mechanism 4 connected to the channel control mechanism 3, and a straightening mechanism 5 connected to the outer cylinder 1. The channel control mechanism 3 adjusts the flow of the grouting fluid in the same manner as in Embodiment 1; similarly, the straightening mechanism 5 is steered via the steering mechanism 4 in the same manner as in Embodiment 1.

[0118] It is understood that the inner cylinder 2 has three sets of through holes, namely the seventh through hole 25, the eighth through hole 26, and the ninth through hole 27. By aligning the seventh through hole 25 with the through hole on the second piston chamber 46, drilling fluid can be injected into the second piston chamber 46 to make the steering pin 43 move downward. By aligning the eighth through hole 26 with the through hole in the third piston chamber 47, drilling fluid can be injected into the third piston chamber 47. At the same time, the bottom of the third piston chamber 47 is provided with a flow channel for discharging drilling fluid. By setting the flow rate of drilling fluid injected into the third piston chamber 47 to be greater than the flow rate discharged from the third piston chamber 47, the steering pin 43 moves upward.

[0119] In this embodiment, the straightening mechanism 5 is located below the ball-discarding chamber 12. The inner cylinder 2 is also provided with a fourth piston chamber 28 that is connected to the first grouting channel 21 through the ninth through hole 27. The drilling fluid injected into the first grouting channel 21 can enter the fourth piston chamber 28 to push the straightening mechanism 5 located above the fourth piston chamber 28 upward, thereby unfolding the straightening mechanism 5 during the upward movement.

[0120] Finally, it should be noted that the embodiments disclosed in this invention are merely preferred embodiments of this invention and are only used to illustrate the technical solutions of this invention, not to limit it. Although this invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this invention.

Claims

1. A multi-stage variable diameter stabilizing device, characterized in that, include: The outer cylinder is a hollow structure. An inner cylinder is disposed within the hollow structure of the outer cylinder. The inner cylinder is a hollow structure, and its hollow portion serves as a first grouting channel. A channel control mechanism, which is connected to and internally communicates with the inner cylinder, is used to adjust the flow state of the grouting fluid. A steering mechanism is provided between the outer cylinder and the inner cylinder; A straightening mechanism is connected to a steering mechanism and an outer cylinder. After being turned by the steering mechanism, the straightening mechanism is used to open up during the upward movement to straighten the cylinder. The channel control mechanism includes: The channel control pipe is connected to the inner cylinder and has internal communication. The channel control pipe has a hollow structure, and the hollow part is a second grouting channel. The second grouting channel is connected to the first grouting channel. First spring; support tube, the first spring is disposed in the support tube, and the first spring is connected to the channel control tube; The middle part of the channel control tube is provided with a ball discharge port and a first locking part that cooperates with the ball discharge port. The first locking part cooperates with the inner wall of the inner cylinder to adjust the position of the steel ball. The channel control tube is also provided with a plurality of first through holes on the same horizontal line, the first through holes being located above the ball discharge port; The inner cylinder is provided with a third through hole and a fourth through hole from high to low, wherein the third through hole and the fourth through hole are both located below the first through hole; The gap between the outer cylinder and the inner cylinder located above the support tube is the ball disposal cavity.

2. The multi-stage variable diameter stabilizing device according to claim 1, characterized in that, The steering mechanism includes: Steering control tube, which is sleeved with the inner cylinder; Steering piston, which is sleeved with the steering control tube; Steering pin, which is connected to the steering piston; The second spring is disposed in the steering piston and sleeved on the outer periphery of the steering control tube.

3. The multi-stage variable diameter stabilizing device according to claim 2, characterized in that, There is a gap between the steering control pipe and the inner cylinder, and the gap between the steering control pipe and the inner cylinder is the third grouting channel; The steering control tube is provided with a fifth through hole; The steering piston has a fourth locking part in the middle of its inner side, the steering pin is connected to the fourth locking part, and the fourth locking part abuts against the top of the second spring; There is a gap between the outer cylinder and the steering piston, wherein the gap between the outer cylinder and the steering piston is the first piston chamber; There is a gap between the steering piston and the steering control tube, wherein the gap above the fourth locking part is the second piston chamber, and the gap below the fourth locking part is the third piston chamber; The second piston chamber is connected to the third grouting channel via the fifth through hole; There is a gap between the outer cylinder and the steering piston, and the gap between the outer cylinder and the steering piston is the fourth grouting channel.

4. The multi-stage variable diameter stabilizing device according to claim 3, characterized in that, The steering mechanism further includes: A closed tube, the bottom of which has an opening and is sleeved with the outer cylinder, is used to close the first piston chamber; The fifth grouting channel is located at the top of the second piston chamber and is used to connect the second piston chamber with the fourth grouting channel.

5. The multi-stage variable diameter stabilizing device according to claim 4, characterized in that, The outer wall of the steering control tube is provided with a steering slide, which is used to connect with the steering pin to enable the steering control tube to turn. The steering slide includes two sets of vertically arranged sliding sections, and a steering section located between the sliding sections; The steering section is tilted; The steering pin in the steering piston can only move up and down, not rotate.

6. The multi-stage variable diameter stabilizing device according to claim 5, characterized in that, The corrective mechanism includes: The first adjusting sleeve is connected to the outer cylinder. The second adjusting sleeve is adapted to the first adjusting sleeve and is connected to the steering control tube; The third spring, the two ends of which are respectively connected to the first adjusting sleeve and the second adjusting sleeve; A straightening component, which is connected to a second adjusting sleeve; The first adjusting sleeve has multiple adjusting slots; The second adjusting sleeve is provided with multiple adjusting keys, which are adapted to the adjusting groove.

7. A multi-stage variable diameter stabilizing device according to claim 6, characterized in that, The straightening component includes a straightening block, a straightening key disposed on the straightening block, and limiting seats respectively connected to the top and bottom of the straightening block; The limiting seat includes a first limiting seat and a second limiting seat, which are respectively connected to the top and bottom of the straightening block. The first limiting seat is rotatably connected to the second adjusting sleeve. The second limiting seat is connected to the closed tube; The center of the straightening block is provided with a raised straightening key; The outer cylinder is provided with a straightening opening that is adapted to the straightening block; The center of the straightening opening is provided with an inclined groove, which is a straightening groove. The straightening groove is adapted to the straightening key so that the straightening block opens when it moves upward.

8. A multi-stage variable diameter stabilization method, characterized in that, Stabilization using the multi-stage variable diameter stabilizing device as described in claim 7 includes the following steps: S1. Steel balls are inserted into the inner cylinder. The steel balls enter the second grouting channel through the first grouting channel and block the second grouting channel after contacting the first locking part. S2. Drilling fluid is added to the first grouting channel. The drilling fluid accumulates in the second grouting channel. The first spring is compressed. The channel pipe control pipe descends to the alignment of the first through hole and the third through hole. S3. Drilling fluid enters the third grouting channel through the first and third through holes, and then enters the second piston chamber through the fifth through hole; S4. The drilling fluid entering the second piston chamber presses downwards against the fourth locking part, and the steering pin moves downwards with the fourth locking part. The steering pin cooperates with the steering slide to make the steering control tube and the second adjusting sleeve connected to the steering control tube turn. S5. Continue to add drilling fluid to the first grouting channel. The drilling fluid continues to accumulate in the second grouting channel. The first spring continues to be compressed. The channel pipe control pipe descends to the alignment of the first through hole and the fourth through hole. The drilling fluid enters the third piston chamber through the first through hole and the fourth through hole. S6. Drilling fluid enters the third piston chamber and squeezes the fourth locking part upward. The fourth locking part moves upward, and the steering pin moves upward with the fourth locking part. The steering pin cooperates with the steering slide to make the steering control tube and the second adjusting sleeve connected to the steering control tube turn, aligning the adjusting groove of the first adjusting sleeve with the adjusting key of the second adjusting sleeve. S7. Drilling fluid continues to be added to the first grouting channel. The drilling fluid accumulates in the second grouting channel. The first spring continues to be compressed. The channel control pipe continues to descend until the inner wall of the inner cylinder loses its sealing effect on the channel control pipe. The drilling fluid enters the ball disposal chamber and flows into the first piston chamber through the fourth grouting channel. An upward hydraulic pressure is applied to the sealing pipe. When the hydraulic pressure is greater than the restoring force of the third spring, it pushes the second limit seat and the straightening block to move upward, and the straightening block opens.

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