In-situ collection drilling equipment based on quick return mechanism

Abstract

The invention discloses in-situ collection drilling equipment based on a quick return mechanism, which comprises a drill rod, the bottom of the drill rod is provided with a drill bit, and a flushing fluid channel and a first pipe body communicated with a wellhead are formed in the middle of the drill rod; a second pipe body which is distributed in the radial direction of the drill rod and connected with the first pipe body is arranged on the drill rod, a collecting assembly is movably installed on the second pipe body, and rock sample chippings on the outer side of the drill rod and close to the drill bit are collected in situ when the collecting assembly is fixed; an annular plugging bag is arranged on the portion, above the collecting assembly, of the drill rod, the plugging bag expands gradually after being pressed and is tightly attached to the well wall so as to change the flowing direction of flushing fluid in an annulus between the drill rod and the rotating hole, and when the collecting assembly is released, the redirected flushing fluid provides pushing force for the collecting assembly. The collecting assembly can return to the wellhead along the first pipe body; according to the invention, the rock sample debris can be directly collected near the drill bit, and the real-time performance, pertinence and accuracy of monitoring are improved.

Description

Technical Field

[0001] This invention relates to the field of drilling equipment technology, and more specifically to an in-situ drilling equipment based on a rapid return mechanism. Background Technology

[0002] Drilling is a crucial part of the exploration and development of oil, natural gas, and mineral resources. However, drilling operations often face complex and variable underground environments, such as formation pressure, rock hardness, and fracture distribution. These uncertainties pose significant risks to the drilling process, including but not limited to blowouts, stuck pipe, and well collapse. To effectively prevent and mitigate these risks, modern drilling technology widely employs risk warning systems, the core of which lies in achieving early warning through real-time monitoring and analysis of key parameters during the drilling process.

[0003] Currently, a common risk warning method involves deploying a series of sensors near the drill bit. These sensors capture and transmit multiple data points, including drill pressure, torque, vibration, and temperature, to the ground control center. By processing and analyzing this data using specialized analysis equipment, the working condition downhole can be preliminarily assessed, and potential risks can be predicted and early warning mechanisms triggered. However, this method has limitations in its direct sensing range, particularly its inability to directly acquire and reflect the true condition of the downhole rock formations, such as lithological changes and fracture development. This, to some extent, limits the accuracy and timeliness of the early warning system.

[0004] Another approach, attempting to indirectly infer downhole rock formation conditions by detecting the properties of drilling mud in the annulus, while mitigating some of the shortcomings of direct monitoring, also has significant drawbacks. Specifically, this method suffers from the following limitations: during drilling, rock fragments generated from the drill bit cutting through the rock formation mix with the flushing fluid and must traverse a considerable annulus path to reach the wellhead for external equipment testing. This process not only introduces a time lag, meaning the test results cannot reflect the actual downhole conditions in real time, but also results in complex mud sample compositions due to the mixing of rock fragments from different depths and lithologies within the annulus. These complexities make accurate differentiation and analysis difficult, thus reducing the accuracy and reliability of the test results. Summary of the Invention

[0005] The purpose of this invention is to provide an in-situ drilling equipment based on a rapid return mechanism to solve the problems of delayed drilling rock sample collection in the prior art, and the mixing of rock debris of different depths and lithologies in the annulus, which makes the final mud sample composition complex, difficult to accurately distinguish and analyze, and other technical problems.

[0006] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution: An in-situ collection drilling device based on a fast return mechanism, comprising: The drill pipe has a drill bit at its bottom and a flushing fluid channel formed in the middle of the drill pipe. The flushing fluid channel has a first pipe body that communicates with the wellhead. The drill rod has a second tube body distributed radially along the drill rod, and the first tube body and the second tube body are connected by an arc-shaped tube body; The second tube is movably equipped with a collection component, which, when fixed, collects rock debris from the outside of the drill rod and near the drill bit in situ. The drill pipe is provided with multiple circumferentially spaced centering seats above the acquisition assembly. The outer surfaces of the multiple centering seats are connected to an annular sealing bladder. When the sealing bladder is pressurized, it gradually expands and adheres tightly to the well wall to change the flow direction of the flushing fluid in the annulus between the drill pipe and the borehole. When the acquisition assembly is released, the flushing fluid enters the second pipe body, the arc-shaped pipe body, and the first pipe body. The redirected flushing fluid provides a driving force for the acquisition assembly, enabling the acquisition assembly to return to the wellhead along the first pipe body, so as to quickly return the collected rock sample debris to the wellhead.

[0007] As a preferred embodiment of the present invention, the opening of the acquisition component can be opened and closed automatically by pressure drive, and liquid can be introduced into the first tube and discharged in the reverse direction. In this process, after liquid is introduced into the first tube, the opening of the collection component is pushed open to collect rock debris on the outside of the drill rod and close to the drill bit in situ. After the liquid in the first tube is discharged in the reverse direction, the opening of the collection component automatically closes to seal the sample inside the collection component.

[0008] As a preferred embodiment of the present invention, the flushing fluid channel is further provided with a hydraulic line, and the sealing bladder is supplied with fluid by the hydraulic line.

[0009] As a preferred embodiment of the present invention, the acquisition component includes a detection cylinder disposed in the second tube, a slide rod that slides through the detection cylinder, and a spring sleeved on the outside of the slide rod. The section of the detection cylinder facing the outside of the second tube is open, and the other end of the detection cylinder is closed. A sealing plate is fixedly provided at the open end of the slide rod near the detection cylinder, and a limiting seat located outside the detection cylinder is fixed at the other end of the slide rod; The two ends of the spring are respectively fixed to the outside of the slide rod; After fluid is introduced into the first tube, it acts on the limiting seat, pushing the slide rod and the sealing plate to move outward of the second tube, releasing the sealing of the detection cylinder, so as to collect rock debris near the drill bit; After the fluid in the first tube is discharged in the reverse direction, the sealing plate re-seals the detection cylinder under the rebound force of the spring to seal the rock sample debris inside the detection cylinder.

[0010] In a preferred embodiment of the present invention, the slide rod is provided with a limiting ring, the outer side of the limiting ring is fixedly installed on the inner wall of the detection cylinder, and the slide rod can slide in a sealed manner along the central cavity of the limiting ring; One end of the spring is fixedly installed on the limiting ring, and the other end of the spring is fixedly installed on the outside of the slide rod.

[0011] As a preferred embodiment of the present invention, a sealing ring is installed on the outer curved surface of the detection cylinder, and the sealing ring enables the detection cylinder to be slidably and sealed within the second tube body, the arc-shaped tube body, and the first tube body.

[0012] As a preferred embodiment of the present invention, a vibrator is also fixed on the limiting seat, and the vibrating end of the vibrator is in contact with the slide rod; When the vibrator is started, it can vibrate the slide rod and the sealing plate connected to the slide rod, so that the rock sample debris in the detection cylinder is more compactly accumulated in the detection cylinder.

[0013] As a preferred embodiment of the present invention, two symmetrically arranged second hydraulic cylinders are also embedded in the second tube body. The second hydraulic cylinders are used to position the detection cylinder of the acquisition component, and the second hydraulic cylinders can fix and release the detection cylinder. The second hydraulic cylinder is supplied with hydraulic fluid by a hydraulic pipeline, and the hydraulic pipeline is bundled to the first pipe body.

[0014] As a preferred embodiment of the present invention, the drill pipe includes a deflection sub, a detection sub, and a straight drill section that are hinged sequentially from bottom to top; The drill bit is installed at the end of the deflection sub that is away from the detection sub; The deflection section extends integrally into a push-back portion near the inner side of the detection section, and a first hydraulic cylinder is embedded in the detection section, the first hydraulic cylinder being supplied with fluid by the hydraulic pipeline; The output end of the first hydraulic cylinder slides radially along the detection section, and the output end of the first hydraulic cylinder is used to drive the push part.

[0015] As a preferred embodiment of the present invention, the straight drill section includes a plurality of flexible short sections that are hinged in sequence, and there is a deflection limit angle between adjacent flexible short sections, wherein the deflection limit angle is set to 3°-12°. The length of the detection cylinder is set to 0.75-0.85 times the length of the flexible short section.

[0016] Compared with the prior art, the present invention has the following advantages: This invention utilizes a data acquisition component to obtain rock debris samples from the drill bit and, based on a rapid return mechanism, quickly returns the rock debris samples to the wellhead. Furthermore, a detection component reduces the potential risk of mixing and contamination of the rock debris samples during the return process. Moreover, during the sampling process, it reduces the chance of mixing with rock debris samples from different locations, thereby improving the real-time performance, specificity, and accuracy of rock debris analysis, and providing an accurate data foundation for risk warning during the drilling process. Attached Figure Description

[0017] To more clearly illustrate the embodiments of the present invention or the technical solutions in 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 merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the drilling equipment according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the detection cylinder when it is opened to collect rock samples according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the detection cylinder when the rock sample is sealed in a closed manner according to an embodiment of the present invention; The labels in the diagram represent the following: 1. Flexible sub; 2. Detection sub; 3. Deflection sub; 4. Drill bit; 5. First hydraulic cylinder; 6. First tube body; 7. Second tube body; 8. Second hydraulic cylinder; 9. Acquisition assembly; 10. Hydraulic line; 11. Centering seat; 91. Detection cylinder; 92. Limiting ring; 93. Slide rod; 94. Sealing plate; 95. Spring; 96. Limiting seat; 97. Vibrator; 98. Sealing ring. Detailed Implementation

[0019] The technical solutions of 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1 As shown, the present invention provides an in-situ wellbore collection device based on a fast return mechanism, comprising: The drill pipe has a drill bit 4 at its bottom and a flushing fluid channel in the middle of the drill pipe. The flushing fluid channel has a first pipe body 6 that communicates with the wellhead.

[0021] The drill pipe has a second tube 7 distributed radially along the drill pipe, and the first tube 6 and the second tube 7 are connected by an arc-shaped tube.

[0022] The second tube 7 is movably equipped with a collection component 9. When the collection component 9 is fixed, it collects rock debris from the outside of the drill rod and near the drill bit in situ.

[0023] Above the acquisition component 9, the drill pipe is provided with multiple circumferentially spaced centralizing seats 11. The outer surfaces of the multiple centralizing seats 11 are connected to an annular sealing bladder. After being pressurized, the sealing bladder gradually expands and adheres tightly to the well wall to change the flow direction of the flushing fluid in the annulus between the drill pipe and the borehole. When the acquisition component 9 is released, the flushing fluid enters the second pipe body 7, the arc-shaped pipe body, and the first pipe body 6. The redirected flushing fluid provides a driving force for the acquisition component 9, enabling the acquisition component 9 to return to the wellhead along the first pipe body 6, so as to quickly return the collected rock sample debris to the wellhead.

[0024] This embodiment utilizes the acquisition component 9 to obtain rock fragments near the drill bit 4, and based on the rapid return mechanism, it greatly shortens the time from sample acquisition to analysis, improves the real-time performance, targeting and accuracy of monitoring, and enhances the effectiveness of risk warning.

[0025] The fast return mechanism works as follows: When the fixed acquisition component 9 is in use, the acquisition component 9 completes the acquisition of rock debris. When the acquisition component 9 needs to be returned to the wellhead, a hydraulic line 10 is also provided in the flushing fluid channel. The sealing bladder is supplied with fluid by the hydraulic line 10. After the fluid is filled into the sealing bladder by the hydraulic line 10, the sealing bladder is pressurized. The sealing bladder gradually expands and adheres tightly to the well wall. At this time, the flow direction of the flushing fluid in the annulus between the drill pipe and the borehole is changed, and the first pipe body 7 and the second pipe body 6 are adjusted to a negative pressure state. The flushing fluid enters the second pipe body 7, the arc-shaped pipe body and the first pipe body 6. The redirected flushing fluid provides a driving force for the acquisition component 9, so that the acquisition component 9 can return to the wellhead along the first pipe body 6, so as to quickly return the collected rock sample debris to the wellhead.

[0026] This not only improves detection efficiency but also reduces potential mixing and contamination of rock debris during transportation. Because the detection component 9 can return to the wellhead more quickly, the rock debris is better preserved, thus improving the accuracy of subsequent analyses. Furthermore, the reduced chance of mixing with rock debris from different locations results in more reliable detection results.

[0027] Furthermore, vibration sensors are embedded in the drill pipe, which can monitor the vibration of the drill pipe in real time during the drilling process. These vibration data can reflect information such as the interaction between the drill bit 4 and the rock, the flow state of the drilling fluid, and possible mechanical failures.

[0028] It should be noted that, in order to cooperate with the first tube 7 and the second tube 6 to adjust to a negative pressure state to complete the automatic sealing of the collection component 9, the opening of the collection component 9 is designed to be able to be opened and closed automatically by pressure drive, and liquid can be introduced into the first tube and discharged in the reverse direction.

[0029] In this process, after liquid is introduced into the first tube 6, the opening of the collection component 9 is pushed open to collect rock debris on the outside of the drill rod and close to the drill bit in situ.

[0030] After the liquid in the first tube is discharged in reverse, the opening of the collection component 9 automatically closes to seal the sample inside the collection component 9.

[0031] In order to adapt the opening switch of the acquisition component 9 to the operation of introducing liquid into the first tube 6 and discharging liquid in the reverse direction, the acquisition component 9 provided in this embodiment has the following structural composition: The acquisition component 9 includes a detection cylinder 91 disposed inside the second tube 7, a slide rod 93 that slides through the detection cylinder 91, and a spring 95 sleeved on the outside of the slide rod 93. The two ends of the spring 95 are respectively fixed to the outside of the slide rod 93. One end of the detection cylinder 91 facing the outside of the second tube 7 is open, and the other end of the detection cylinder 91 is closed.

[0032] A sealing plate 94 is fixedly provided at the open end of the slide rod 93 near the detection cylinder 91, and a limiting seat 96 located outside the detection cylinder 91 is fixed at the other end of the slide rod 93.

[0033] After fluid is introduced into the first tube 6, it acts on the limiting seat 96, pushing the slide rod 93 and the sealing plate 94 to move outward toward the second tube 7, releasing the seal on the detection cylinder 91, so as to collect rock sample debris near the drill bit 4.

[0034] After the fluid in the first tube 6 is discharged in the reverse direction, the sealing plate 94 re-seals the detection tube 91 under the rebound force of the spring 95, so as to seal the rock sample debris inside the detection tube 91.

[0035] Furthermore, a limiting ring 92 is provided on the outer sleeve of the slide rod 93. The outer side of the limiting ring 92 is fixedly installed on the inner wall of the detection cylinder 91, and the slide rod 93 can slide along the central cavity of the limiting ring 92 in a sealed manner. One end of the spring 95 is fixedly installed on the limiting ring 92, and the other end of the spring 95 is fixedly installed on the outer side of the slide rod 93.

[0036] In order to fix and release the acquisition component 9, two symmetrically arranged second hydraulic cylinders 8 are also embedded in the second tube 7. The second hydraulic cylinders 8 are used to position the detection cylinder 91 of the acquisition component 9.

[0037] The second hydraulic cylinder 8 can fix and release the detection cylinder 91. The second hydraulic cylinder 8 is supplied with hydraulic fluid by the hydraulic line 10, which is bundled to the first pipe body 6, reducing the space occupied by the equipment downhole. This is especially important in the space-constrained drilling environment, helping to avoid interference and collisions between the hydraulic line 10 and other components. The bundled hydraulic line 10 is tightly integrated with the first pipe body 6, forming a more stable overall structure. This structure can better resist vibration and impact during drilling, improving the overall stability of the equipment.

[0038] The drilling equipment of this embodiment utilizes the acquisition component 9 to obtain rock fragments near the drill bit 4 and quickly return them to the wellhead for detection. This effectively helps operators understand the downhole rock formations and alleviates the problems of lag and inaccuracy to a certain extent. The specific usage method is as follows: During the initial drilling phase, two second hydraulic cylinders 8 are used to fix the acquisition component 9 inside the second pipe body 7. At the same time, under the action of spring 95, the sealing plate 94 tightly seals the opening of the detection cylinder 91 to prevent flushing fluid and rock debris from entering, and the drill bit 4 drills downward. like Figure 2As shown, when rock samples need to be collected, fluid such as high-pressure gas or liquid is introduced into the first tube 6. This fluid acts on the limiting seat 96 through the flushing fluid channel. Since the detection cylinder 91 is fixed by the second hydraulic cylinder 8, the limiting seat 96 pushes the slide rod 93 and the sealing plate 94 to move to the outside of the detection section 2, releasing the blockage of the detection cylinder 91. At this time, the spring 95 is in a compressed state, and the rock sample debris near the drill bit 4 mixes with the flushing fluid and can quickly enter the detection cylinder 91.

[0039] like Figure 3 As shown, after the rock sample is collected, the fluid flow into the first tube 6 is stopped, and the residual fluid in the first tube 6 is extracted. The slide bar 93 and the sealing plate 94 re-seal the opening end of the detection cylinder 91 under the rebound force of the spring 95. Subsequently, the fluid supply to the second hydraulic cylinder 8 is adjusted through the hydraulic pipeline 10, causing the second hydraulic cylinder 8 to contract, thereby releasing the fixation on the collection component 9. Under the natural flow of the flushing fluid in the annulus, the collection component 9, together with the rock sample debris therein, quickly returns to the wellhead along the path of the second tube 7, the arc-shaped tube, and the first tube 6, so as to realize the active collection of the rock sample.

[0040] This embodiment significantly shortens the time from sample collection to analysis by directly collecting rock fragments near drill bit 4 and designing a rapid return mechanism, enabling real-time detection of drilling rock samples. Since the rock fragments are collected close to drill bit 4 and quickly sealed and transported, the chance of mixing with rock fragments from different locations is reduced, thereby improving the accuracy of the detection results.

[0041] Furthermore, a vibrator 97 is fixed on the limiting seat 96, and the vibrating end of the vibrator 97 is in contact with the slide rod 93. When the vibrator 97 is started, it can vibrate the slide rod 93 and the sealing plate 94 connected to the slide rod 93, so that the rock sample debris in the detection cylinder 91 is more compactly accumulated inside the detection cylinder 91.

[0042] During rock sample collection, the vibrator 97 drives the slide bar 93 and the sealing plate 94 connected to the slide bar 93 to vibrate. This vibration promotes a more compact accumulation of rock sample debris inside the detection cylinder 91, reducing gaps and air bubbles between the rock sample debris, thereby improving the sample density and representativeness. Compacted rock sample debris is more conducive to subsequent analysis and testing, improving the accuracy of the test results. During prolonged use, rock sample debris may accumulate at the inlet or inside the detection cylinder 91, causing blockage. The periodic vibration of the vibrator 97 effectively prevents this blockage, ensuring the smooth operation of the collection component 9.

[0043] Furthermore, a sealing ring 98 is installed on the outer curved surface of the detection cylinder 91, which enables the detection cylinder 91 to be slidably disposed in the second tube body 7, the arc-shaped tube body, and the first tube body 6.

[0044] By constructing a sealing ring 98, the contact area between the acquisition component 9, particularly the detection cylinder 91, and the second pipe body 7, the arc-shaped pipe body, and the first pipe body 6 is significantly reduced. During retrieval after rock sample collection, this structure reduces frictional resistance during sliding, thereby improving the throughput of the acquisition component 9 within these pipe bodies (second pipe body 7, arc-shaped pipe body, and first pipe body 6). Furthermore, the sealing ring 98 fits tightly against the inner wall of the pipe, forming an effective seal. Additionally, the increased throughput means the acquisition component 9 can return to the wellhead more quickly, thus shortening the detection cycle. This is particularly important for drilling operations requiring frequent rock formation detection, as it significantly improves operational efficiency.

[0045] The drill pipe consists of a deflection sub 3, a detection sub 2, and a straight drill section, which are hinged together from bottom to top. The drill bit 4 is installed at the end of the deflection sub 3 away from the detection sub 2.

[0046] The deflection section 3 extends integrally to the inner side of the detection section 2 to form a push part, and the detection section 2 has a first hydraulic cylinder 5 embedded in it. The first hydraulic cylinder 5 is supplied with hydraulic fluid by the hydraulic line 10.

[0047] The output end of the first hydraulic cylinder 5 slides radially along the detection section 2, and the output end of the first hydraulic cylinder 5 is used to drive the push part.

[0048] The push section is a structure integrally formed by extending the deflection sub 3 close to the inner side of the detection sub 2. Its main function is to control the deflection of the deflection sub 3 through contact with the wellbore wall, thereby adjusting the drilling direction of the drill bit 4. Specifically: 1. During the drilling process, the pusher is driven by the first hydraulic cylinder 5 to push against the well wall, generating a reaction force that causes the deflection sub 3 to deflect.

[0049] 2. This deflection mechanism allows the equipment to actively control the drill bit trajectory in directional drilling, adapting to wellbore curvature or changes, thereby improving drilling accuracy and efficiency.

[0050] 3. The articulated design of the push-fit section and the flexible short section 1 ensures the flexibility and stability of the equipment downhole and reduces the risk of jamming.

[0051] The first hydraulic cylinder 5 is embedded in the detection section 2 and is supplied with hydraulic fluid by the hydraulic line 10. Its specific functions include: Drive pusher: The output end of the first hydraulic cylinder 5 slides radially along the detection sub 2, directly pushing the pusher to contact or disengage from the well wall. By controlling the hydraulic supply, the pushing force and position of the pusher can be precisely adjusted, thereby achieving deflection control of the deflection sub 3.

[0052] Assisted directional drilling: By adjusting the state of the pusher, the first hydraulic cylinder 5 helps the equipment maintain the predetermined drilling direction or correct trajectory deviation in complex formations, enhancing its adaptability to the downhole environment.

[0053] Integrated hydraulic control: The first hydraulic cylinder 5 is connected to the hydraulic pipeline 10, sharing the hydraulic system, which simplifies the equipment structure and improves reliability and maintenance convenience.

[0054] In summary, the pusher and the first hydraulic cylinder 5 work together to realize the active guidance function of the drilling equipment, thereby improving the control capability of the drilling process and the accuracy of rock sample collection.

[0055] The straight drill section includes multiple flexible short sections 1 that are hinged together in sequence. There is a deflection limit angle between adjacent flexible short sections 1, which is set to 3°-12°. The length of the detection cylinder 91 is set to 0.75-0.85 times the length of the flexible short section 1.

[0056] In this embodiment, the deflection limit angle between adjacent flexible sections 1 is set to 3° to 12°, allowing the entire acquisition assembly 9 to adapt more flexibly to the curvature and changes in the wellbore during downhole operations. This adaptability helps reduce jamming caused by wellbore irregularities, thereby improving throughput.

[0057] In addition, in this embodiment, the length of the detection cylinder 91 is set to 0.75-0.85 times the length of the flexible short section 1 based on the deflection limit angle. This proportional design helps optimize the throughput of the acquisition component 9 in the pipeline. An excessively long detection cylinder 91 may increase the frictional resistance with the inner wall of the pipeline, while an excessively short detection cylinder 91 may not be able to accommodate enough rock sample debris. Through a reasonable length ratio design, the throughput of the acquisition component can be improved while ensuring the detection effect.

[0058] Therefore, this invention significantly shortens the time from sample collection to analysis and improves the real-time performance of monitoring by directly collecting rock debris near drill bit 4 and designing a rapid return mechanism. Because the rock debris is collected close to drill bit 4 and rapidly transported in a sealed manner, the chance of mixing with rock debris from different locations is reduced, thereby improving the accuracy of the detection results.

[0059] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. An in-situ collection drilling device based on a fast return mechanism, characterized in that, include: The drill pipe has a drill bit (4) at its bottom and a flushing fluid channel is formed in the middle of the drill pipe. The flushing fluid channel is provided with a first pipe (6) that communicates with the wellhead. The drill rod is provided with a second tube (7) distributed radially along the drill rod, and the first tube (6) and the second tube (7) are connected by an arc-shaped tube. The second tube (7) is movably equipped with a collection component (9), which, when fixed, collects rock debris on the outside of the drill rod and close to the drill bit in situ; The drill pipe is provided with multiple circumferentially spaced centering seats (11) above the acquisition assembly (9). The outer surfaces of the multiple centering seats (11) are connected to an annular sealing bladder. After being pressurized, the sealing bladder gradually expands and adheres tightly to the well wall to change the flow direction of the flushing fluid in the annulus between the drill pipe and the borehole. When the acquisition assembly (9) is released, the flushing fluid enters the second pipe body (7), the arc-shaped pipe body and the first pipe body (6). The redirected flushing fluid provides a driving force for the acquisition assembly (9), enabling the acquisition assembly (9) to return to the wellhead along the first pipe body (6) to quickly return the collected rock fragments to the wellhead.

2. The in-situ collection drilling equipment based on a fast return mechanism according to claim 1, characterized in that, The opening of the acquisition component (9) can be opened and closed automatically by pressure drive, and liquid can be introduced into the first tube and discharged in the reverse direction; Among them, after liquid is introduced into the first tube, the opening of the collection component (9) is pushed open to collect rock debris on the outside of the drill rod and close to the drill bit in situ. After the liquid in the first tube is discharged in reverse, the opening of the collection component (9) automatically closes to seal the sample inside the collection component (9).

3. The in-situ collection drilling equipment based on a fast return mechanism according to claim 1, characterized in that, The flushing fluid channel is also equipped with a hydraulic line (10), and the sealing bladder is supplied with fluid by the hydraulic line (10).

4. The in-situ collection drilling equipment based on a fast return mechanism according to claim 1, characterized in that, The acquisition component (9) includes a detection cylinder (91) disposed inside the second tube (7), a slide rod (93) that slides through the detection cylinder (91), and a spring (95) sleeved on the outside of the slide rod (93). One end of the detection cylinder (91) facing the outside of the second tube (7) is open, and the other end of the detection cylinder (91) is closed. A sealing plate (94) is fixedly provided at the open end of the slide rod (93) near the detection cylinder (91), and a limiting seat (96) located outside the detection cylinder (91) is fixed at the other end of the slide rod (93). The two ends of the spring (95) are respectively fixed to the outside of the slide rod (93); After fluid is introduced into the first tube (6), it acts on the limiting seat (96), pushing the slide rod (93) and the sealing plate (94) to move towards the outside of the second tube (7), releasing the sealing of the detection cylinder (91) to collect rock fragments near the drill bit (4); After the fluid in the first tube (6) is discharged in the reverse direction, the sealing plate (94) re-seals the detection tube (91) under the rebound force of the spring (95) to seal the rock fragments inside the detection tube (91).

5. The in-situ collection drilling equipment based on a fast return mechanism according to claim 4, characterized in that, The slide rod (93) is fitted with a limiting ring (92), the outer side of the limiting ring (92) is fixedly installed on the inner wall of the detection cylinder (91), and the slide rod (93) can slide along the central cavity of the limiting ring (92) in a sealed manner; One end of the spring (95) is fixedly installed on the limiting ring (92), and the other end of the spring (95) is fixedly installed on the outside of the slide rod (93).

6. The in-situ collection drilling equipment based on a fast return mechanism according to claim 4, characterized in that, The outer curved surface of the detection cylinder (91) is equipped with a sealing ring (98), which enables the detection cylinder (91) to be sealed and slidably disposed in the second tube body (7), the arc-shaped tube body, and the first tube body (6).

7. The in-situ collection drilling equipment based on a fast return mechanism according to claim 4, characterized in that, A vibrator (97) is also fixed on the limiting seat (96), and the vibrating end of the vibrator (97) is in contact with the slide rod (93); When the vibrator (97) is started, it can vibrate the slide rod (93) and the sealing plate (94) connected to the slide rod (93) so that the rock sample debris in the detection cylinder (91) is more compactly piled up in the detection cylinder (91).

8. The in-situ collection drilling equipment based on a fast return mechanism according to claim 1, characterized in that, The second tube (7) also contains two symmetrically arranged second hydraulic cylinders (8), which are used to position the detection cylinder (91) of the acquisition component (9). The second hydraulic cylinders (8) can fix and release the detection cylinder (91). The second hydraulic cylinder (8) is supplied with hydraulic fluid by a hydraulic line (10), and the hydraulic line (10) is tied to the first pipe body (6).

9. The in-situ collection drilling equipment based on a fast return mechanism according to claim 1, characterized in that, The drill pipe includes a deflection section (3), a detection section (2), and a straight drill section, which are hinged from bottom to top. The drill bit (4) is installed at the end of the deflection sub (3) away from the detection sub (2); The deflection section (3) extends integrally with a push-back part near the inner side of the detection section (2), and a first hydraulic cylinder (5) is embedded in the detection section (2), which is supplied with liquid by the hydraulic line (10). The output end of the first hydraulic cylinder (5) slides radially along the detection section (2), and the output end of the first hydraulic cylinder (5) is used to drive the push part.

10. An in-situ collection drilling device based on a fast return mechanism according to claim 9, characterized in that, The straight drill section includes a plurality of flexible short sections (1) that are hinged together in sequence. There is a deflection limit angle between adjacent flexible short sections (1), and the deflection limit angle is set to 3°-12°. The length of the detection cylinder (91) is set to 0.75-0.85 times the length of the flexible short section (1).

Images