Coring equipment and centralizing tool thereof

Abstract

The embodiment of the invention provides coring equipment and a centralizing tool thereof, the centralizing tool comprises a centralizing main body, a piston part and a plurality of centralizing parts, an overflowing cavity is defined in the centralizing main body, the plurality of centralizing parts are arranged in the circumferential direction of the centralizing main body, each centralizing part can be arranged on the centralizing main body in a sliding mode in the radial direction of the centralizing main body, and the piston part is arranged on the centralizing main body. The piston part can be arranged in the overflowing cavity in the axial direction of the centralizing body in a sliding mode, and a plurality of extrusion blocks corresponding to the centralizing parts in a one-to-one mode are arranged on the piston part. According to the centralizing tool, power of drilling fluid can be ingeniously utilized to promote the piston part to move, then the multiple centralizing parts are promoted to abut against the well wall of a drilled well, the centralizing effect is achieved, the number of parts is small, installation is easy, and the centralizing effect is better.

Description

Technical Field

[0001] This application relates to the field of oil production equipment, and more particularly to a coring device and its straightening tool. Background Technology

[0002] Centralizers are tools used to stabilize downhole drilling tools and prevent deviation. They are widely used in oil, gas and geological exploration drilling projects.

[0003] A centralizer has emerged in the related technology. The centralizer has a centralizer body and multiple centralizing blocks disposed on the centralizer body. The multiple centralizing blocks protrude from the centralizer body and abut against the well wall to achieve a centralizing effect. Multiple springs support the multiple centralizing blocks.

[0004] However, the centralizers in the aforementioned technologies not only require a large number of springs, have many parts and are complex to install, but also have weak supporting force provided by the springs, resulting in unsatisfactory centralizing effect under high-intensity operation during drilling. Summary of the Invention

[0005] This application provides a straightening tool with fewer parts, simpler installation, and more stable straightening effect.

[0006] In a first aspect, embodiments of this application provide a straightening tool for straightening drilling tools, comprising: a straightening body for connecting to the drilling tool, the straightening body defining a flow chamber inside; a plurality of straightening parts arranged circumferentially along the straightening body, each straightening part being slidably disposed on the straightening body radially; a piston part slidably disposed on the flow chamber axially along the straightening body, the piston part being provided with a plurality of extrusion blocks corresponding one-to-one with the plurality of straightening parts; the straightening tool is configured such that: when drilling fluid is introduced into the flow chamber, the drilling fluid causes the piston part to slide axially along the straightening body, thereby using the plurality of extrusion blocks to drive the plurality of straightening parts to slide radially outward along the straightening body, so that the plurality of straightening parts abut against the well wall of the well, thereby straightening the drilling tool inside the well.

[0007] In one possible implementation, a plurality of extrusion blocks are disposed on the outer periphery of the piston portion; and each extrusion block has an extrusion ramp, which is configured to gradually contract toward the outer wall of the piston portion in the direction of the piston portion near the straightening block.

[0008] In one possible implementation, the outer wall of the piston portion is formed with a plurality of limiting grooves, each limiting groove corresponding to a plurality of straightening portions, and each limiting groove extends along the axial direction of the straightening body; at least a portion of the straightening portion is located in the limiting groove; and a plurality of extrusion blocks are respectively disposed in the plurality of limiting grooves.

[0009] In one possible implementation, the straightening body has a plurality of through holes arranged at intervals along the circumference, and the plurality of through holes correspond one-to-one with a plurality of straightening parts; and each straightening part further includes: a driving block, which passes through the through hole; and a straightening block, which is located outside the straightening body and connected to the driving block.

[0010] In one possible implementation, the outer wall of the straightening body is further formed with a plurality of receiving grooves, which are connected one-to-one with a plurality of through holes; at least a portion of the straightening block is located in the receiving groove.

[0011] In one possible implementation, the centering tool further includes a ball-throwing section disposed in the flow chamber, the ball-throwing section including a ball, the ball-throwing section being configured to release the ball into the flow chamber under the impact of drilling fluid, so that the ball enters the drilling tool.

[0012] In one possible implementation, the ball-throwing unit further includes: a ball-throwing body, the interior of which defines a ball-throwing cavity for receiving the ball, the ball-throwing body having a ball-throwing port for connecting the flow cavity and the ball-throwing cavity; the straightening tool is configured such that when drilling fluid is introduced into the flow cavity, at least a portion of the drilling fluid enters the ball-throwing cavity to cause the ball to move to the ball-throwing port and be thrown into the flow cavity from the ball-throwing port.

[0013] In one possible implementation, the pitching unit further includes: a support frame, which is slidably disposed in the pitching cavity toward the pitching opening for supporting the pitch; and a support spring, which is disposed in the pitching cavity and sleeved on the support frame for elastically supporting the support frame.

[0014] In one possible implementation, the ball-throwing body is disposed on the peripheral wall of the flow chamber; the straightening tool further includes: a fluid distribution section disposed in the flow chamber, located upstream of the fluid inlet of the ball-throwing body, the fluid distribution section having a main flow channel and a secondary flow channel, the main flow channel being used to guide the flow chamber upstream and downstream at the fluid distribution section, and the outlet of the secondary flow channel facing the opening of the ball-throwing body, so as to guide at least a portion of the drilling fluid to the ball-throwing chamber.

[0015] Secondly, embodiments of this application provide a core extraction device, including a straightening tool according to any of the above claims.

[0016] The straightening tool provided in this application embodiment has a piston portion that can be slidably disposed in the flow chamber along the axial direction of the straightening body. When drilling fluid is introduced into the flow chamber, the drilling fluid impacts the piston portion, allowing it to slide along the axial direction of the straightening body. The piston portion drives multiple extrusion blocks to abut against multiple straightening portions, squeezing the multiple straightening portions radially outward from the straightening body. This allows the outer ends of the straightening portions to abut against the well wall of the well, thus stably straightening the straightening body within the well. Consequently, the drilling tool connected to the straightening body can also be stably straightened within the well. Compared to related technologies that use springs to support multiple straightening blocks, the straightening tool in this embodiment has fewer parts, is simpler to install, and the drilling fluid can provide a stronger force to the piston, making the straightening blocks more stable and firm, resulting in a better straightening effect. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic cross-sectional view of the straightening tool in one embodiment of this application;

[0019] Figure 2 This is a schematic cross-sectional view of the piston portion in a straightening tool according to one embodiment of this application;

[0020] Figure 3 This is a schematic cross-sectional view of the ball-throwing part of the righting tool in one embodiment of this application.

[0021] Figure label:

[0022] 100. Straightening body; 110. Flow cavity; 120. Through hole; 130. Receiving groove; 200. Straightening part; 210. Drive block; 220. Straightening block; 230. Contact surface; 300. Piston part; 310. Limiting groove; 320. Flow channel; 330. Sleeve ring; 340. Baffle plate; 400. Extrusion block; 410. Extrusion slope; 500. Ball throwing part; 510. Ball throwing; 520. Ball throwing body; 522. Ball throwing cavity; 524. Ball throwing port; 530. Support frame; 540. Support spring; 550. Fastener; 600. Liquid flow distribution part; 610. Main flow channel; 620. Secondary flow channel; 700. Limiting part; 701. Connecting channel; 710. Return spring. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0024] The centralizers in the related technology include a centralizer body and multiple centralizing blocks disposed on the centralizer body. These centralizing blocks protrude from the centralizer body and abut against the wellbore wall to achieve a centralizing effect. Multiple springs support the centralizing blocks. However, the centralizers in the aforementioned related technology not only require a large number of springs, resulting in numerous parts and complex installation, but also provide relatively weak supporting force from the springs, leading to unsatisfactory centralizing effects under high-intensity drilling operations.

[0025] Based on this, this application provides a centering tool. This centering device cleverly utilizes drilling fluid to drive the piston, which in turn drives multiple centering sections to be extruded radially outward from the centering body. This allows the outer ends of the centering sections to abut against the wellbore wall, thus fixing the centering body and stably centering the drilling tool within the well. This centering tool has fewer parts, is easy to install, and the drilling fluid provides a stronger force to the piston, making the centering block more stable and firm, resulting in a better centering effect.

[0026] The following will combine Figures 1 to 3 The contents of this application are described in detail so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0027] This application provides a straightening tool that can be used to straighten drilling tools. The straightening tool includes a straightening body 100, a piston portion 300, and a plurality of straightening portions 200. The straightening body 100 is used to connect to the drilling tool, and a flow chamber 110 is defined inside the straightening body 100. The plurality of straightening portions 200 are arranged circumferentially along the straightening body 100, and each straightening portion 200 is slidably disposed on the straightening body 100 radially. The piston portion 300 is slidably disposed on the flow chamber 110 axially along the straightening body 100, and a plurality of compression blocks 400 corresponding one-to-one with the plurality of straightening portions 200 are provided on the piston portion 300.

[0028] The straightening tool is configured such that when drilling fluid is introduced into the flow chamber 110, the drilling fluid causes the piston portion 300 to slide axially along the straightening body 100, thereby using multiple compression blocks 400 to drive multiple straightening portions 200 to slide radially outward along the straightening body 100, so that the multiple straightening portions 200 abut against the well wall of the well, thereby straightening the drilling tool in the well.

[0029] In this embodiment, the straightening body 100 can be a short drill collar. The flow chamber 110 of the straightening body 100 is internally connected. The lower end of the straightening body 100 is connected to the upper end of the drilling tool and is internally connected. In this way, on the one hand, drilling fluid can be transported to the drilling tool below through the flow chamber 110 of the straightening body 100, and on the other hand, the straightening body 100 can play the role of straightening the drilling tool.

[0030] In this embodiment, the piston portion 300 is slidably disposed in the flow chamber 110 along the axial direction of the straightening body 100. When drilling fluid is introduced into the flow chamber 110, the drilling fluid impacts the piston portion 300, allowing the piston portion 300 to slide along the axial direction of the straightening body 100. In this way, the piston portion 300 can drive multiple extrusion blocks 400 to gradually approach multiple straightening portions 200. When the multiple extrusion blocks 400 pass the multiple straightening portions 200, the multiple extrusion blocks 400 abut against the multiple straightening portions 200, squeezing the multiple straightening portions 200 radially outward from the straightening body 100, thereby allowing the outer end of the straightening portion 200 to abut against the well wall of the well. In this way, the straightening body 100 can be stably straightened in the well, and the drilling tools connected to the straightening body 100 can also be stably straightened in the well.

[0031] Therefore, the straightening tool of this embodiment cleverly utilizes the power of the drilling fluid to move the piston 300, thereby causing multiple straightening parts 200 to abut against the well wall, achieving a straightening effect. Compared to related technologies that use springs to support multiple straightening blocks 220, the straightening tool of this embodiment has fewer parts, is simpler to install, and the drilling fluid can provide a stronger force to the piston, making the straightening blocks 220 more stable and firm, resulting in a better straightening effect.

[0032] Furthermore, in this embodiment, the centralizing part 200 of the centralizing tool plays a centralizing role through movable adjustment. Therefore, compared with the rigid centralizer in the prior art that cannot adjust the outer diameter, the centralizing tool of this embodiment can adapt to more sizes and complex irregular oil wells.

[0033] Furthermore, the multiple straightening parts 200 can also be arranged in pairs opposite to each other on the straightening body 100, so that a pair of straightening parts 200 can play a stabilizing role in one diameter direction of the straightening body 100.

[0034] Furthermore, a plurality of extrusion blocks 400 are disposed on the outer periphery of the piston portion 300. Each extrusion block 400 has an extrusion ramp 410, which is configured to gradually taper toward the outer wall of the piston portion 300 in the direction of the piston portion 300 near the straightening block 220.

[0035] With this design, as the piston 300 approaches the centralizing block 220 under the impact of drilling fluid, the constricted end of the extrusion ramp 410 contacts the centralizing block 220 first. As the piston 300 continues to move, the part of the extrusion ramp 410 that contacts the centralizing block 220 expands outward. This enables the centralizing part 200 to slide along the radial outer side of the centralizing body 100 by using the extrusion ramp 410.

[0036] Furthermore, each straightening part 200 may also be provided with a contact surface 230 that matches the extension direction of the extrusion slope 410, which can increase the contact area between the extrusion slope 410 and the straightening part 200, making the driving process more stable.

[0037] In some embodiments, the outer wall of the piston portion 300 is formed with a plurality of limiting grooves 310, each limiting groove 310 corresponding to a plurality of straightening portions 200, and each limiting groove 310 extending axially along the straightening body 100. At least a portion of the straightening portion 200 is located in the limiting groove 310. A plurality of pressing blocks 400 are respectively disposed in the plurality of limiting grooves 310.

[0038] Since the centering part 200 can only rotate radially relative to the centering body 100, it cannot rotate circumferentially relative to the centering body 100. Furthermore, since the limiting groove 310 extends axially along the centering body 100, at least a portion of the centering part 200 is located within the limiting groove 310. Thus, by utilizing the cooperation of multiple centering parts 200 and multiple limiting grooves 310, the movement trajectory of the piston part 300 is constrained, allowing it to slide only axially along the centering body 100. This not only prevents the piston part 300 from wobbling but also facilitates the driving of the piston part 300 by the drilling fluid.

[0039] In this embodiment, at least a portion of the straightening part 200 is located in the limiting groove 310, and multiple extrusion blocks 400 are respectively disposed in multiple limiting grooves 310, which facilitates the contact driving between the extrusion blocks 400 and the straightening part 200 within the limiting groove 310.

[0040] In some embodiments, the straightening body 100 has a plurality of through holes 120 arranged circumferentially at intervals, and the plurality of through holes 120 correspond one-to-one with a plurality of straightening parts 200. Each straightening part 200 may further include a driving block 210 and a straightening block 220. The driving block 210 passes through the through hole 120. The straightening block 220 is located outside the straightening body 100 and is connected to the driving block 210.

[0041] In this embodiment, the through hole 120 connects the flow cavity 110 and the external environment of the straightening body 100. The drive block 210 passes through the through hole 120 to facilitate cooperation with the extrusion block 400 on the piston part 300. When drilling fluid is introduced into the flow cavity 110, the piston part 300 slides along the axial direction of the straightening body 100, and the piston part 300 drives the multiple extrusion blocks 400 to move. The multiple extrusion blocks 400 abut against the inner end of the drive block 210, squeezing the drive block 210 radially outward along the through hole 120, thereby allowing the outer end of the straightening block 220 to abut against the well wall of the well, thus straightening the straightening body 100.

[0042] Furthermore, the shape of the drive block 210 can be adapted to the contour of the through hole 120, and a sealing gasket is provided between the drive block 210 and the hole wall of the through hole 120 to seal the gap between them and prevent drilling fluid leakage.

[0043] Furthermore, the outer wall of the straightening body 100 is also formed with a plurality of receiving grooves 130, which are connected one-to-one with a plurality of through holes 120. At least a portion of the straightening block 220 is located in the receiving groove 130.

[0044] In this embodiment, the receiving groove 130 is connected to the through hole 120, and the driving block 210 passes through the through hole 120 and then sets the straightening block 220 in the receiving groove 130.

[0045] In the initial state, the centralizing block 220 can be completely contained within the receiving groove 130, thus preventing the centralizing tool from interfering with the well wall during the process of lowering or raising it downhole.

[0046] When the straightening tool is in operation, the straightening block 220 can protrude at least partially from the receiving groove 130 under the action of the piston part 300 so as to abut against the well wall.

[0047] Furthermore, the straightening tool may also include a limiting part 700 and a return spring 710. The limiting part 700 may be fixedly disposed downstream of the piston part 300, and the return spring 710 may be disposed between the limiting part 700 and the piston part 300. When the piston part 300 is impacted by drilling fluid, the piston part 300 moves toward the limiting part 700, the straightening part 200 protrudes from the straightening body 100, and the piston part 300 compresses the return spring 710. When the drilling fluid pressure decreases, under the restoring force of the return spring 710, the piston part 300 can return to its original position, and the straightening part 200 also returns to its original position, releasing the support on the straightening body 100.

[0048] Furthermore, the piston portion 300 has a through-flow channel 320 defined inside, which allows drilling fluid to flow downwards, facilitating its flow to the drilling tool. The limiting portion 700 also has a through-flow connecting channel 701 defined inside. The lower end of the piston portion 300 has a sleeve ring 330 that extends into the connecting channel 701 of the limiting portion 700. This serves two purposes: firstly, since the limiting portion 700 is fixed to the lower part of the piston portion 300, the sleeve ring 330 guides and limits the piston portion 300; secondly, the sleeve ring 330 connects the flow channel 320 and the connecting channel 701, allowing the drilling fluid to flow efficiently to the drilling tool.

[0049] Furthermore, the piston portion 300 defines a baffle plate 340 inside the flow channel 320. The baffle plate 340 can block a part of the flow channel 320. In this way, on the one hand, when the drilling fluid impacts the baffle plate 340, it can effectively impact the piston portion 300. On the other hand, the baffle plate 340 can reduce the flow area, increase the pressure of the drilling fluid, and thus increase the pressure of the drilling fluid applied to the piston portion 300.

[0050] In some embodiments, the righting tool may further include a ball-throwing section 500 disposed in the flow chamber 110, the ball-throwing section 500 being configured to release a ball 510 into the flow chamber 110 under the impact of drilling fluid, so that the ball 510 enters the drilling tool.

[0051] The use of drop balls (510) is very common in drilling tools. Their function is to block the flow channels of the drilling tool, causing localized pressure buildup in the drilling fluid. Typically, drop balls are deployed from the surface using mechanical tools after the drilling tool is secured downhole. However, in some special operational scenarios, it is inconvenient to deploy drop balls from the surface.

[0052] In this embodiment, since the centralizing tool is connected to the drilling tool and their interiors are interconnected, the ball-dropping part 500 is pre-installed in the flow chamber 110 of the centralizing tool. Thus, when the centralizing tool and the drilling tool are lowered into the well together, when the ball-dropping part 510 is needed, it is released into the flow chamber 110 under the impact of the drilling fluid, and then enters the interior of the drilling tool through the flow chamber 110.

[0053] Furthermore, the pitching part 500 may also include a pitching body 520, the interior of which defines a pitching cavity 522 for accommodating the pitch 510, and the pitching body 520 has a pitching port 524 for connecting the flow cavity 110 and the pitching cavity 522.

[0054] The straightening tool is configured such that when drilling fluid is introduced into the flow chamber 110, at least a portion of the drilling fluid enters the ball-throwing chamber 522, causing the ball-throwing device 510 to move to the ball-throwing port 524 and be thrown into the flow chamber 110 from the ball-throwing port 524.

[0055] In this embodiment, the ball-throwing body 520 can be fixed inside the flow chamber 110, and the inlet of the ball-throwing chamber 522 faces the inlet of the flow chamber 110. This facilitates at least a portion of the drilling fluid from the inlet of the flow chamber 110 to flow into the ball-throwing chamber 522, impacting the ball-throwing body 510 and thus facilitating the movement of the ball-throwing body 510 to the ball-throwing port 524. Therefore, pre-installing the ball-throwing body 510 not only enables rapid ball-throwing operations but also addresses special site conditions such as when surface ball-throwing is not possible or when the core sample is fine in a large well.

[0056] Furthermore, during the use of drilling tools, drilling fluid may need to be maintained at all times, while the ball 510 needs to be released at a specific time. The ball 510 needs to be released under the impact of drilling fluid. Therefore, the ball release unit 500 can be configured such that the drilling fluid can only push the ball 510 towards the ball release port 524 under a specific pressure, so as to control the timing of the release of the ball 510.

[0057] Furthermore, the pitching section 500 may also include a support frame 530 and a support spring 540. The support frame 530 is slidably disposed in the pitching cavity 522 toward the pitching port 524 to support the pitch 510. The support spring 540 is disposed in the pitching cavity 522 and sleeved on the support frame 530 to elastically support the support frame 530.

[0058] During use, the drilling fluid entering the ball-feeding chamber 522 impacts the support frame 530 and the ball 510 on it. When the drilling fluid pressure is low, it cannot overcome the elastic support of the support spring 540 on the support frame 530, and the support frame 530 and the ball 510 on it remain stationary. When the drilling fluid pressure is increased to overcome the elastic support of the support spring 540 on the support frame 530, the support frame 530 and the ball 510 on it slide to the ball-feeding port 524, eventually causing the ball 510 to fall from the ball-feeding port 524 into the flow chamber 110, where it is flushed into the drilling tool along with the drilling fluid.

[0059] Furthermore, the interior of the piston section 300 can define a through flow channel 320, which on the one hand allows drilling fluid to flow through it, thereby facilitating the flow of drilling fluid to the downstream drilling tools, and on the other hand, allows the ball 510 to pass through, thereby facilitating the ball 510 to fall into the downstream drilling tools.

[0060] Furthermore, the ball-throwing body 520 is disposed on the peripheral wall of the flow chamber 110. The centering tool may also include a fluid distribution section 600, which is disposed in the flow chamber 110, located upstream of the fluid inlet of the ball-throwing section 500. The fluid distribution section 600 has a main flow channel 610 and a secondary flow channel 620. The main flow channel 610 is used to guide the flow chamber 110 upstream and downstream at the fluid distribution section 600. The outlet of the secondary flow channel 620 faces the opening of the ball-throwing body 520 to guide at least a portion of the drilling fluid to the ball-throwing chamber 522.

[0061] In this embodiment, the ball-throwing body 520 can be mounted on the peripheral wall of the flow chamber 110 using fasteners 550. A secondary flow channel 620 is provided on the fluid distribution section 600, with its outlet facing the opening of the ball-throwing body 520. This increases the flow rate of drilling fluid entering the ball-throwing body 520, thereby facilitating the impact of the ball-throwing device 510.

[0062] When the drilling fluid pressure is low, the drilling fluid guided to the ball-throwing body 520 through the secondary flow channel 620 of the fluid distribution section 600 is insufficient to overcome the elastic support of the support spring 540 on the support frame 530. At this time, the support frame 530 and the ball 510 on it are stationary. When the drilling fluid pressure is increased, the drilling fluid guided to the ball-throwing body 520 through the secondary flow channel 620 of the fluid distribution section 600 overcomes the elastic support of the support spring 540 on the support frame 530, causing the support frame 530 and the ball 510 on it to slide to the ball-throwing port 524. Finally, the ball 510 falls from the ball-throwing port 524 into the flow chamber 110 and is flushed into the drilling tool along with the drilling fluid in the flow chamber 110.

[0063] This application also provides a coring device, which may include drilling tools and the centering tool in any of the above embodiments.

[0064] A core sampling device is a tool used to extract core samples from rock formations for analysis and research. The device involves drilling into the formation using drilling tools, extracting the core, transporting it into the barrel of the drilling tool, breaking it off, and returning it to the surface.

[0065] In this embodiment, the drilling tool can be connected to the lower end of the centering tool. During use, both can be lowered into the well, and drilling fluid is injected into the flow chamber 110 of the centering body 100. On one hand, the drilling fluid can flow continuously to the drill bit of the drilling tool to assist in drill bit operation. On the other hand, as the drilling fluid flows through the flow chamber 110 of the centering body 100, it pushes the piston 300 to slide axially along the centering body 100. The piston 300 drives multiple extrusion blocks 400 to extrude multiple centering parts 200, causing the multiple centering parts 200 to be squeezed radially outward from the centering body 100. This allows the outer ends of the centering parts 200 to abut against the well wall, thus centering the centering body 100 and consequently the drilling tool. This ensures the stability of the drilling tool during core drilling and downhole safety during tripping, preventing core breakage due to axial vibration, which could lead to core blockage, loss of core, or core grinding, as after core drilling is completed.

[0066] After the operation is completed, the pressure of the drilling fluid decreases. Under the restoring force of the return spring 710, the piston part 300 returns to its original position, and the multiple centering parts 200 also return to their original positions, releasing the support on the centering body 100, which facilitates smooth tripping out of the hole.

[0067] Furthermore, the coring device of this application is applicable to various coring tools that require ball-dropping operations. During drilling tool operation, when it is necessary to release the ball 510, the pressure of the drilling fluid can be increased, so that the drilling fluid entering the ball-dropping body 520 can overcome the elastic support of the support spring 540 on the support frame 530, causing the ball 510 to move to the ball-dropping port 524, so that the ball 510 is released into the flow chamber 110, and then falls into the drilling tool along with the drilling fluid.

[0068] When different sizes of ball droppers (510) need to be deployed, only the size of the turbulence block and the ball dropper notch needs to be adjusted. This avoids the drawback of having to lift the drill string to the coupling before ball dropper deployment can be carried out, and prevents problems such as core loss and low core recovery rate caused by lifting the drill string.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A straightening tool for straightening drilling tools, characterized in that, include: A centering body (100) is used to connect to the drilling tool, and the interior of the centering body (100) defines a flow cavity (110); Multiple straightening parts (200) are arranged circumferentially along the straightening body (100), and each straightening part (200) is slidably disposed on the straightening body (100) radially. A piston section (300) is slidably disposed in the flow cavity (110) along the axial direction of the straightening body (100), and the piston section (300) is provided with a plurality of extrusion blocks (400) corresponding one-to-one with the plurality of straightening sections (200); The straightening tool is configured such that when drilling fluid is introduced into the flow chamber (110), the drilling fluid causes the piston portion (300) to slide axially along the straightening body (100), thereby using the plurality of extrusion blocks (400) to drive the plurality of straightening portions (200) to slide radially outward along the straightening body (100), so that the plurality of straightening portions (200) abut against the well wall of the well, thereby straightening the drilling tool in the well.

2. The straightening tool according to claim 1, characterized in that, Multiple extrusion blocks (400) are disposed on the outer periphery of the piston portion (300); and, Each of the extrusion blocks (400) has an extrusion ramp (410) which is configured to gradually taper toward the outer wall of the piston portion (300) in the direction of the piston portion (300) near the straightening block (220).

3. The straightening tool according to claim 1, characterized in that, The outer wall of the piston part (300) is formed with a plurality of limiting grooves (310), and the plurality of limiting grooves (310) correspond one-to-one with the plurality of straightening parts (200), and each limiting groove (310) extends along the axial direction of the straightening body (100); At least a portion of the straightening part (200) is located in the limiting groove (310); The plurality of extrusion blocks (400) are respectively disposed in the plurality of limiting grooves (310).

4. The straightening tool according to claim 1, characterized in that, The straightening body (100) has a plurality of through holes (120) arranged at intervals along the circumference, and the plurality of through holes (120) correspond one-to-one with the plurality of straightening parts (200); and Each of the aforementioned straightening parts (200) also includes: A drive block (210) is provided through the through hole (120); The straightening block (220) is located outside the straightening body (100) and is connected to the drive block (210).

5. The straightening tool according to claim 4, characterized in that, The outer wall of the straightening body (100) is also formed with a plurality of receiving grooves (130), and the plurality of receiving grooves (130) are connected to the plurality of through holes (120) in a one-to-one correspondence; At least a portion of the straightening block (220) is located in the receiving groove (130).

6. The straightening tool according to any one of claims 1 to 5, characterized in that, Also includes: A ball-throwing section (500) is disposed in the flow chamber (110). The ball-throwing section (500) includes a ball (510). The ball-throwing section (500) is configured to release the ball (510) into the flow chamber (110) under the impact of drilling fluid, so that the ball (510) enters the drilling tool.

7. The straightening tool according to claim 6, characterized in that, The pitching section (500) also includes: The pitching body (520) has a pitching cavity (522) defined inside for accommodating the pitch (510), and the pitching body (520) has a pitching port (524) for connecting the flow cavity (110) and the pitching cavity (522); The straightening tool is configured such that when drilling fluid is introduced into the flow chamber (110), at least a portion of the drilling fluid enters the ball-throwing chamber (522) to cause the ball-throwing device (510) to move to the ball-throwing port (524) and be thrown into the flow chamber (110) through the ball-throwing port (524).

8. The straightening tool according to claim 7, characterized in that, The pitching section (500) also includes: A support frame (530) is slidably disposed in the ball-throwing cavity (522) toward the ball-throwing port (524) to support the ball (510); A support spring (540) is disposed in the ball-throwing cavity (522) and sleeved on the support frame (530) to elastically support the support frame (530).

9. The straightening tool according to claim 7, characterized in that, The ball-throwing body (520) is disposed on the peripheral wall of the flow cavity (110); The straightening tool also includes: A fluid distribution section (600) is disposed in the flow chamber (110) and located upstream of the ball-throwing section (500). The fluid distribution section (600) has a main flow channel (610) and a secondary flow channel (620). The main flow channel (610) is used to connect the flow chamber (110) upstream and downstream at the fluid distribution section (600). The outlet of the secondary flow channel (620) faces the opening of the ball-throwing body (520) to guide at least a portion of the drilling fluid to the ball-throwing chamber (522).

10. A core extraction device, characterized in that, Including the righting tool according to any one of claims 1 to 9.

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