While-drilling film-forming coring device capable of generating film-forming liquid through in-situ rotation and mixing

Abstract

The invention belongs to the technical field of scientific rock drilling, and particularly relates to a while-drilling film-forming coring device for generating film-forming liquid through in-situ rotation and mixing. The device comprises a drill column, a core barrel is connected in the drill column, an isolation piston and a bottom piston are sleeved with the core barrel, a second-section center rod is connected to the isolation piston, the other end of the second-section center rod extends out of the top of the core barrel, the upper section of the second-section center rod is sleeved with a first-section center rod, and the lower portion of the second-section center rod is sleeved with a third-section center rod. The lower end of the three-section center rod is rotationally connected with the bottom piston, and stirring fan blades are connected to the three-section center rod; an inner cavity of the rock core barrel is divided into an upper cavity and a lower cavity by the isolation piston, a liquid A is stored in the upper cavity, and a liquid B is stored in the lower cavity; the lower part of the rock core barrel is provided with a rock core claw assembly for breaking a rock core. The invention provides a while-drilling film-forming coring device for generating film-forming liquid through in-situ rotation and mixing so as to achieve in-situ obtaining of the film-forming liquid which is highly and uniformly mixed.

Description

Technical Field

[0001] The invention belongs to the technical field of rock science drilling, and in particular relates to a drilling-based film-forming and coring device for generating film-forming fluid by in-situ rotation and mixing. Background Art

[0002] The key to exploring the laws of deep earth science is to obtain research samples that truly reflect the deep in-situ state, so as to directly obtain accurate physical and mechanical parameters and resource endowment conditions. It is the only way to achieve mineral exploration, safe construction of major projects, and solve scientific mysteries. However, the existing conventional coring process lacks effective protection for the core during the entire process of core drilling, transfer, and testing. The core is in direct contact with drilling fluid or sealing fluid, and it is difficult to avoid the diffusion and loss of materials in the core pores, which will lead to distortion of core analysis results. Therefore, it is necessary to develop deep in-situ quality preservation, moisture retention and light preservation coring technology. Deep in-situ quality preservation, moisture retention and light preservation coring technology has been designed and developed. This technology uses a film-forming fluid to cover the surface of the core during the dynamic process of drilling, and evenly grows a layer of dense polymer solid film with high barrier properties on the surface of the core. This film can preserve the volatile oil and gas components in the core, maintain the humidity stability inside the core, and maintain the in-situ dark and lightless environment, so as to truly obtain core samples that preserve the deep in-situ true state. The chemical reagents that produce the curing reaction in the film-forming liquid are divided into two components, which are pre-stored in a self-isolated manner and mixed in situ at a deep location to form the film-forming liquid.

[0003] In the prior art, the traditional static mixer structure in the drilling film-forming and coring device may have the following problems: Since the static mixer can only mix the incoming precursor liquid A and liquid B at one time, the mixing may be uneven due to the asynchronous inflow ratio of the precursor liquid A and liquid B. The formed film-forming liquid cannot fully undergo a solidification reaction and cannot generate a solid film with optimal barrier properties, resulting in poor sealing effect on the core. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a film-forming and coring device for drilling that generates film-forming liquid by in-situ rotation and mixing, which can ignore the problem of uneven migration ratio of precursor A liquid and B liquid, and realize multiple and continuous stirring and mixing of A liquid and B liquid, so as to ensure that a highly uniformly mixed film-forming liquid is obtained in situ, so as to form a sealing film layer with high barrier performance on the surface of the core, thereby improving the protection effect of the core. The technical solution adopted by the present invention is:

[0005] A film-forming coring device for drilling that generates film-forming liquid by in-situ rotation and mixing, comprising a drill string, a core barrel connected to the drill string, an isolation piston and a bottom piston sleeved in the core barrel, a two-section center rod connected to the isolation piston, the other end of the two-section center rod extending from the top of the core barrel, the upper section of the two-section center rod sleeved with a one-section center rod, the lower section of the two-section center rod sleeved with a three-section center rod, the lower end of the three-section center rod is rotatably connected to the bottom piston, and the three-section center rod is connected to a stirring fan blade; the isolation piston divides the inner cavity of the core barrel into an upper cavity and a lower cavity, liquid A is stored in the upper cavity, and liquid B is stored in the lower cavity; a core claw assembly for clamping the core is provided at the lower part of the core barrel.

[0006] The coring device is lowered to the bottom of the well. Before coring begins, the second section center rod and the isolation piston are pulled upward to the top of the core barrel by lifting a section center rod, and the precursor A liquid and the precursor B liquid merge in the core barrel. Lower a section center rod so that its bottom end contacts the third section center rod. The wellhead turntable drives the section center rod, and the bottom end of the section center rod is connected to the threaded buckle at the top of the third section center rod as a whole. By continuously rotating a section center rod, the stirring fan blades fully and evenly stir and mix the precursor A liquid and B liquid in the core barrel to form a high-quality film-forming liquid with efficient solidification ability. At the beginning of coring, fix a section center rod, drive the drill string and the coring drill bit to drill downward, and relative movement is formed between the core barrel and the bottom piston to compress the liquid storage space, so that the film-forming liquid is discharged. The core enters the core barrel, and the film-forming liquid covers the surfaces of the drilled core as it is drilled, displacing the external fluid around the core.

[0007] The present invention innovatively designs a film-forming and coring device for drilling that generates film-forming liquid by in-situ rotary mixing, and adopts rotating fans to mix precursor liquid A and liquid B in situ. The device avoids the problems that may occur in the traditional static mixer structure: since the static mixer can only mix the incoming precursor liquid A and liquid B at one time, the mixing may be uneven due to the asynchronous inflow ratio of the precursor liquid A and liquid B, and the formed film-forming liquid cannot fully undergo a solidification reaction, resulting in poor sealing effect on the core. The present invention can ensure that the precursor liquid A and liquid B are continuously and fully stirred and mixed in situ through the in-situ mixing of the rotating fans, forming a high-quality and uniformly mixed film-forming liquid, thereby improving the in-situ sealing effect on the core. At the same time, the device can arbitrarily control the preset ratio of the precursor liquid A and liquid B, increase the preset amount of the precursor liquid, and has high stability in engineering applications.

[0008] As a preferred embodiment of the present invention, an isolation check valve is provided on the isolation piston, and a check valve is provided in the bottom piston. When the second-stage center rod and the isolation piston are pulled upward, the precursor A liquid passes through the isolation check valve and merges with the precursor B liquid in the core barrel. The drill string and the coring drill bit are driven to drill downward, and relative movement is formed between the core barrel and the bottom piston, and the liquid storage space is compressed, so that the film-forming liquid is discharged from the check valve. The isolation check valve and the check valve can prevent the liquid from leaking or flowing in reverse before coring.

[0009] As a preferred solution of the present invention, the drill string and the core barrel are connected via a bearing. Due to the presence of the bearing, the core barrel can only move downward without rotating.

[0010] As a preferred solution of the present invention, the upper and lower ends of the two-stage center rod are both provided with a necking opening, the lower end of the one-stage center rod and the upper end of the three-stage center rod are both provided with a limiting head, the necking opening at the upper end of the two-stage center rod limits the limiting head of the one-stage center rod, and the necking opening at the lower end of the two-stage center rod limits the limiting head of the three-stage center rod. The one-stage center rod and the three-stage center rod can slide in the two-stage center rod, but the sliding stroke can be limited by the necking openings at the top and bottom of the two-stage center rod to the one-stage center rod and the three-stage center rod, so as to prevent the one-stage center rod or the three-stage center rod from slipping out of the two-stage center rod.

[0011] As a preferred solution of the present invention, the lower end of the one-section center rod and the upper end of the three-section center rod are connected by threads. When the one-section center rod is lowered, the outer thread at the bottom thereof contacts the inner thread at the top of the three-section center rod. By driving the wellhead rotary table to drive the one-section center rod, the one-section center rod and the three-section center rod are threadedly buckled and connected as one, so that the core enters the core barrel during drilling.

[0012] As a preferred solution of the present invention, the stirring fan blade is connected to the lower part of the three-section center rod. When coring starts, a section of the center rod is fixed, and the drill string and the coring drill bit are driven to drill downward. The stirring fan blade is connected to the lower part of the three-section center rod, so that the drill string can move a larger distance relative to the three-section center rod, thereby extending the coring distance.

[0013] As a preferred embodiment of the present invention, the core claw assembly includes a core claw and a bottom sealer. The lower section of the core barrel is the coring section. The coring section is provided with a core claw bevel groove. The core claw is sleeved in the core claw bevel groove. The bottom sealer is connected to the bottom of the coring section. A membrane liquid flow channel is provided on the core claw.

[0014] The core enters the core barrel, the bottom sealer opens, and the film-forming fluid covers the surfaces of the drilled core as it is drilled, displacing the external fluid around the core. After coring is completed, the drill string and a section of the center rod are lifted up, the core claws pull out the core, the bottom sealer rebounds, and the film-forming fluid can cover the bottom of the core, achieving complete coverage and preliminary isolation protection of the core surfaces. After a period of time, the film-forming fluid changes from liquid to a solid film layer. The solid film layer has good barrier sealing performance, achieving complete sealing protection of the core.

[0015] As a preferred solution of the present invention, the core claw inclined groove gradually inclines toward the center of the drill string from top to bottom; a limiting step for limiting the position of the core claw is provided on the upper side of the core claw inclined groove.

[0016] As a preferred solution of the present invention, the bottom sealer is a petal-shaped structure.

[0017] As a preferred embodiment of the present invention, the number of isolation one-way valves on the isolation piston is at least two; the bottom piston is provided with a liquid outlet channel and at least two liquid inlet channels that are interconnected, the liquid inlet channel is connected to the lower cavity, and the one-way valve is arranged in the liquid outlet channel.

[0018] The beneficial effects of the present invention are:

[0019] The present invention innovatively designs a film-forming and coring device for drilling that generates film-forming liquid by in-situ rotation and mixing, and adopts rotating fan blades to mix precursor liquid A and liquid B in-situ. The present invention ensures that the precursor liquid A and liquid B are continuously and fully stirred and mixed in-situ by rotating fan blades for in-situ mixing, forming a high-quality and uniformly mixed film-forming liquid, generating a solid film with high-efficiency barrier properties on the surface of the core, and improving the in-situ sealing effect of the core. At the same time, the device can arbitrarily control the preset ratio of the precursor liquid A and liquid B, increase the preset amount of the precursor liquid, and has high stability in engineering applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0022] Figure 3 It is a schematic diagram of the structure of the present invention after a section of the center rod is lifted;

[0023] Figure 4 It is a partial structural diagram of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the present invention after a section of the center rod is lowered;

[0025] Figure 6 It is a schematic diagram of the structure of the present invention during core drilling;

[0026] Figure 7 yes Figure 6 A partial enlarged view of point B in the middle;

[0027] Figure 8 It is a schematic diagram of the structure of the present invention after coring is completed;

[0028] Fig. 9 yes Figure 8 A partial enlarged view of point C in the middle;

[0029] Fig.10 It is a schematic diagram of the structure of the present invention after the film-forming liquid is solidified.

[0030] In the figure: 1-a center rod; 2-a center rod; 3-drill string; 4-bearing; 5-core barrel; 6-A liquid; 7-a center rod; 8-isolating piston; 9-isolating one-way valve; 10-B liquid; 11-stirring fan blade; 12-center rod bearing; 13-bottom piston; 14-one-way valve; 15-core claw; 16-coring drill bit; 17-bottom sealer; 18-rock formation; 19-film-forming liquid; 20-core; 21-solid film layer; 22-core claw chute. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0033] like Figures 1 to 10 As shown, the in-situ rotary mixing and film-forming fluid generation while drilling film-forming coring device of this embodiment comprises a drill string 3, the uppermost end of the drill string 3 is connected to the top drive or rotary table of the wellhead on the ground, a core barrel 5 is connected to the drill string 3 through a bearing 4, an isolation piston 8 and a bottom piston 13 are sleeved in the core barrel 5, a two-section center rod 2 is connected to the isolation piston 8, the other end of the two-section center rod 2 extends from the top of the core barrel 5, the upper section of the two-section center rod 2 is sleeved with a one-section center rod 1, and the one-section center rod 13 is sleeved in the core barrel 5. The top of the core barrel 5 is connected to the wellhead surface turntable, the lower part of the two-stage center rod 2 is sleeved with a three-stage center rod 7, the lower end of the three-stage center rod 7 is rotatably connected to the bottom piston 13 through the center rod bearing 12, and the three-stage center rod 7 is connected with a stirring fan 11; the isolation piston 8 divides the inner cavity of the core barrel 5 into an upper cavity and a lower cavity, the upper cavity stores liquid A 6, and the lower cavity stores liquid B 10; the lower part of the core barrel 5 is provided with a core claw 15 component for clamping the core 20.

[0034] The A liquid 6 in the upper cavity is epoxy resin, silicone rubber glue crosslinking agent, etc., and the B liquid 10 in the lower cavity is epoxy resin curing agent, silicone rubber catalyst, etc.

[0035] The coring device is lowered to the bottom of the well. Before coring begins, the second-stage center rod 2 and the isolation piston 8 are pulled upward to the top of the core barrel 5 by lifting the first-stage center rod 1, and the precursor A liquid 6 and the precursor B liquid 10 merge in the core barrel 5. Lower the first-stage center rod 1 so that its bottom end contacts the third-stage center rod 7. The first-stage center rod 1 is driven by the wellhead turntable, and the first-stage center rod 1 is buckled and connected to the third-stage center rod 7 as a whole. By continuously rotating the first-stage center rod 1, the stirring fan blades 11 make the precursor A liquid 6 and B liquid 10 in the core barrel 5 fully and evenly stirred and mixed to form a film-forming liquid 19 with curing ability. At the beginning of coring, fix the first-stage center rod 1, drive the drill string 3 and the coring drill bit 16 to drill downward, and due to the presence of the bearing 4, the core barrel 5 only moves downward without rotating. Relative movement is formed between the core barrel 5 and the bottom piston 13, and the liquid storage space is compressed, so that the film-forming liquid 19 is discharged. The core 20 enters the core barrel 5 , and the film-forming fluid 19 covers the surfaces of the drilled core 20 as it is drilled, displacing the external fluid around the core 20 .

[0036] Among them, the isolation piston 8 is provided with an isolation check valve 9, and the bottom piston 13 is provided with a check valve 14. When the second-stage center rod 2 and the isolation piston 8 are pulled upward, the precursor A liquid 6 passes through the isolation check valve 9 and merges with the precursor B liquid 10 in the core barrel 5. The drill string 3 and the coring drill bit 16 are driven to drill downward, and a relative movement is formed between the core barrel 5 and the bottom piston 13, and the liquid storage space is compressed, so that the film-forming liquid 19 is discharged from the check valve 14. The isolation check valve 9 and the check valve 14 can prevent liquid leakage or reverse flow.

[0037] In order to prevent the one-stage center rod 1 or the three-stage center rod 7 from slipping out of the two-stage center rod 2, the upper and lower ends of the two-stage center rod 2 are both provided with necking openings, and the lower end of the one-stage center rod 1 and the upper end of the three-stage center rod 7 are both provided with limiting heads, the necking opening at the upper end of the two-stage center rod 2 limits the limiting head of the one-stage center rod 1, and the necking opening at the lower end of the two-stage center rod 2 limits the limiting head of the three-stage center rod 7. The one-stage center rod 1 and the three-stage center rod 7 can slide in the two-stage center rod 2, but the sliding stroke can be limited by the necking openings at the top and bottom of the two-stage center rod 2 to the one-stage center rod 1 and the three-stage center rod 7, so as to prevent the one-stage center rod 1 or the three-stage center rod 7 from slipping out of the two-stage center rod 2.

[0038] Specifically, the lower end of the one-stage center rod 1 and the upper end of the three-stage center rod 7 are connected by threads. When the one-stage center rod 1 is lowered, the outer thread at the bottom thereof contacts the inner thread at the top of the three-stage center rod 7. By driving the wellhead rotary table to drive the one-stage center rod 1, the one-stage center rod 1 and the three-stage center rod 7 are threadedly buckled and connected as one, so that the core 20 can enter the core barrel 5 during drilling.

[0039] It should be noted that the stirring blade 11 is connected to the lower part of the three-section center rod 7. When coring begins, a section of the center rod 1 is fixed, and the drill string 3 and the coring drill bit 16 are driven to drill downward. The stirring blade 11 is connected to the lower part of the three-section center rod 7, so that the drill string 3 can move a greater distance relative to the three-section center rod 7, thereby extending the coring distance.

[0040] Specifically, the core claw 15 assembly includes a core claw 15 and a bottom sealer 17 with a petal-shaped structure. The lower section of the core barrel 5 is the coring section, and the coring section is provided with a core claw inclined groove 22. The core claw 15 is sleeved in the core claw inclined groove 22, and the bottom sealer 17 is connected to the bottom of the coring section; the core claw 15 is provided with a membrane liquid 19 flow channel.

[0041] The core 20 enters the core barrel 5, the bottom sealer 17 opens, and the film-forming liquid 19 covers the surfaces of the drilled core 20 while drilling, displacing the external fluid around the core 20. After the coring is completed, the drill string 3 and a section of the center rod 1 are lifted, the core claw 15 pulls off the core 20, and the bottom sealer 17 rebounds. The film-forming liquid 19 can cover the bottom of the core 20, achieving complete coverage and preliminary isolation protection of the surfaces of the core 202. After a period of time, the film-forming liquid 19 changes from liquid to a solid film layer 21. The solid film layer 21 has good barrier sealing performance, achieving complete sealing protection of the core 20.

[0042] The core claw inclined groove 22 gradually inclines toward the center of the drill string 3 from top to bottom; a limiting step for limiting the core claw 15 is provided on the upper side of the core claw inclined groove 22 .

[0043] Furthermore, the number of the isolation one-way valves 9 on the isolation piston 8 is at least two; the bottom piston 13 is provided with a liquid outlet channel and at least two liquid inlet channels that are interconnected, the liquid inlet channel is connected to the lower cavity, and the one-way valve 14 is arranged in the liquid outlet channel.

[0044] The operation process of the present invention:

[0045] like Figure 3 and Figure 4 As shown, the coring device is lowered to the bottom of the well. Before coring begins, the first section center rod 1 is lifted, and the second section center rod 2 and the isolation piston 8 are pulled upward to the top of the core barrel 5. The precursor A liquid 6 passes through the isolation check valve 9 and merges with the precursor B liquid 10 in the core barrel 5. Figure 5 As shown, a section of the center rod 1 is lowered so that the outer thread at the bottom end contacts the inner thread at the top of the three-section center rod 7. By driving the wellhead rotary table to drive the section of the center rod 1, the section of the center rod 1 and the three-section center rod 7 are threadedly buckled and connected as one. By continuously rotating the section of the center rod 1, the stirring fan blades 11 can fully and evenly stir and mix the precursor A liquid 6 and B liquid 10 in the core barrel 5 to form a film-forming liquid 19 with curing ability. Figure 6 and Figure 7 As shown, at the beginning of coring, a section of the center rod 1 is fixed, and the drill string 3 and the coring drill bit 16 are driven downward to drill. The core barrel 5 and the bottom piston 13 form a relative movement and compress the liquid storage space, so that the film-forming liquid 19 is discharged from the one-way valve 14. The core 20 enters the core barrel 5, and the bottom sealer 17 opens. The film-forming liquid 19 covers the surfaces of the drilled core 20 while drilling, displacing the external fluid around the core 20. Figure 8 and Fig. 9 As shown, after coring is completed, the drill string 3 and a section of the center rod 1 are lifted, the core claw 15 pulls out the core 20, the bottom sealer 17 rebounds, and the film-forming liquid 19 can cover the bottom of the core 20, achieving complete coverage and preliminary isolation protection of the surfaces of the core 20. Fig.10 As shown, after a period of time, the film-forming liquid 19 changes from a liquid state to a solid film layer 21. The solid film layer 21 has good barrier and sealing properties, and achieves complete sealing protection for the core 20.

[0046] The present invention innovatively designs a film-forming and coring device for drilling that generates film-forming liquid by in-situ rotary mixing, and adopts rotating fans to mix precursors A liquid 6 and B liquid 10 in situ. The device avoids the problems that may occur in the traditional static mixer structure: since the static mixer can only mix the inflowing precursors A liquid 6 and B liquid 10 at one time, the mixing may be uneven due to the asynchronous inflow ratio of the precursors A liquid 6 and B liquid 10, and the formed film-forming liquid 19 cannot fully undergo a solidification reaction, resulting in a poor sealing effect on the core 20. The present invention can ensure that the precursors A liquid 6 and B liquid 10 are continuously and fully stirred and mixed in situ through the in-situ mixing of the rotating fans, forming a high-quality and uniformly mixed film-forming liquid 19, and improving the in-situ sealing effect on the core 20. At the same time, the device can arbitrarily control the preset ratio of the precursors A liquid 6 and B liquid 10, increase the preset amount of the precursors, and has high stability in engineering applications.

[0047] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A film-forming and coring device for in-situ rotating mixing to generate film-forming liquid, characterized in that: The invention comprises a drill string (3), wherein a core barrel (5) is connected to the drill string (3), wherein an isolation piston (8) and a bottom piston (13) are sleeved in the core barrel (5), wherein a two-stage center rod (2) is connected to the isolation piston (8), wherein the other end of the two-stage center rod (2) extends from the top of the core barrel (5), wherein the upper section of the two-stage center rod (2) is sleeved with a one-stage center rod (1), wherein the lower section of the two-stage center rod (2) is sleeved with a three-stage center rod (7), wherein the lower end of the three-stage center rod (7) is rotatably connected to the bottom piston (13), and wherein a stirring fan (11) is connected to the three-stage center rod (7); wherein the isolation piston (8) divides the inner cavity of the core barrel (5) into an upper cavity and a lower cavity, wherein a liquid A (6) is stored in the upper cavity, and a liquid B (10) is stored in the lower cavity; and wherein a core claw assembly for clamping a core (20) is arranged at the lower part of the core barrel (5).

2. The film-forming and coring-while-drilling device for generating film-forming liquid by in-situ rotation and mixing according to claim 1, characterized in that: The isolation piston (8) is provided with an isolation one-way valve (9), and the bottom piston (13) is provided with a one-way valve (14).

3. The film-forming and coring-while-drilling device for generating film-forming liquid by in-situ rotation and mixing according to claim 1, characterized in that: The drill string (3) and the core barrel (5) are connected via a bearing (4).

4. The film-forming and coring-while-drilling device for generating film-forming liquid by in-situ rotation and mixing according to claim 1, characterized in that: The upper and lower ends of the two-stage center rod (2) are both provided with necking openings, the lower end of the one-stage center rod (1) and the upper end of the three-stage center rod (7) are both provided with limiting heads, the necking opening at the upper end of the two-stage center rod (2) limits the limiting head of the one-stage center rod (1), and the necking opening at the lower end of the two-stage center rod (2) limits the limiting head of the three-stage center rod (7).

5. The film-forming and coring-while-drilling device for generating film-forming liquid by in-situ rotation and mixing according to claim 1, characterized in that: The lower end of the one-section central rod (1) and the upper end of the three-section central rod (7) are connected via threads.

6. The film-forming and coring-while-drilling device for generating film-forming liquid by in-situ rotation and mixing according to claim 1, characterized in that: The stirring blades (11) are connected to the lower part of the three-section center rod (7).

7. The film-forming and coring-while-drilling device for generating film-forming liquid by in-situ rotation and mixing according to claim 1, characterized in that: The core claw assembly comprises a core claw (15) and a bottom sealer (17); the lower section of the core barrel (5) is a coring section, the coring section is provided with a core claw inclined groove (22), the core claw (15) is sleeved in the core claw inclined groove (22), and the bottom sealer (17) is connected to the bottom of the coring section; the core claw (15) is provided with a membrane liquid flow channel.

8. The film-forming and coring-while-drilling device for generating film-forming liquid by in-situ rotation and mixing according to claim 7, characterized in that: From top to bottom, the core claw inclined groove (22) gradually inclines toward the center of the drill string (3); and a limiting step for limiting the position of the core claw (15) is provided on the upper side of the core claw inclined groove (22).

9. The film-forming and coring-while-drilling device for generating film-forming liquid by in-situ rotation and mixing according to claim 7, characterized in that: The bottom sealer (17) is a petal-shaped structure.

10. The film-forming and coring-while-drilling device for generating film-forming liquid by in-situ rotation and mixing according to any one of claims 1 to 9, characterized in that: The number of the isolation one-way valves (9) on the isolation piston (8) is at least two; the bottom piston (13) is provided with a liquid outlet channel and at least two liquid inlet channels that are interconnected, the liquid inlet channel is connected to the lower cavity, and the one-way valve (14) is provided in the liquid outlet channel.

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