A kind of moving pulley self-driven transporting film-forming fluid type while-drilling film-forming coring device

Abstract

The present invention belongs to the technical field of coring devices, and particularly relates to a moving pulley self-driven transporting film-forming liquid type coring device while drilling and forming a film. The coring device of the present invention includes a coring barrel, a central rod is sleeved inside the coring barrel, a coring barrel steel wire fixing mechanism is fixed at the upper end of the coring barrel, a central rod steel wire fixing mechanism is fixed at the upper end of the central rod, a movable piston is sleeved between the coring barrel and the central rod, a moving pulley is installed on the movable piston, a steel wire bypasses the moving pulley, one end of the steel wire is connected to the coring barrel steel wire fixing mechanism, and the other end of the steel wire is connected to the central rod steel wire fixing mechanism; the lower end of the fixed piston is connected with an A liquid and B liquid mixing mechanism, the A liquid is communicated with the A liquid and B liquid mixing mechanism from the self-isolation storage cavity through the movable piston, the A liquid self-transporting flow channel hose and the fixed piston, and the B liquid is communicated with the A liquid and B liquid mixing mechanism from the self-isolation storage cavity through the fixed piston. The present invention provides a piston self-isolation - moving pulley self-driven transporting film-forming liquid type coring device while drilling and forming a film.

Description

Technical Field

[0001] The present invention belongs to the technical field of coring devices, and particularly relates to a moving pulley self-driven transporting film-forming liquid type coring device while drilling for forming a film Background Art

[0002] Obtaining core samples that accurately reflect the true information of deep in-situ formations has great scientific significance, and can provide guidance for the accurate exploration and evaluation of deep oil and gas resources, the study of the origin of deep oil and gas resources, and the scientific exploration of deep microbial life forms. However, in the whole process of core drilling, transfer, and testing in the existing conventional coring process, there is a lack of effective protection for the core. The core directly contacts the drilling fluid or the sealing fluid, and it is difficult to avoid the diffusion and loss of substances in the core pores, which will lead to the distortion of the core analysis results and the extinction of the original microorganisms, and it is even more impossible to study the mystery of deep life science. Therefore, it is necessary to develop a deep in-situ coring technology for maintaining quality, moisture, and light. Therefore, a deep in-situ coring technology for maintaining quality, moisture, and light has been designed and developed. This technology uses a film-forming liquid, which covers the surface of the core during the dynamic process while drilling, and a dense polymer solid film with high barrier performance grows uniformly on the surface of the core. This layer of film can preserve the volatile oil and gas components in the core, maintain the humidity stability inside the core, and the in-situ dark and lightless environment, so as to truly obtain and preserve the core samples in the deep in-situ true state. The chemical reagents that generate a curing reaction in the film-forming liquid are divided into two components, which are pre-stored in self-isolation respectively and mixed to form a film-forming liquid in the deep in-situ. It is necessary to design a coring device that can realize the full and stable self-isolation storage of the two components of the film-forming liquid before drilling and the uniform and synchronous self-transport of the two components of the film-forming liquid while drilling, so as to achieve full protection of the core in the deep in-situ Summary of the Invention

[0003] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a piston self-isolation - moving pulley self-driven transporting film-forming liquid type coring device while drilling, which can realize the stable storage of the film-forming liquid and the uniform release while drilling, and provide conditions for realizing the film-forming process while drilling for maintaining quality, moisture, and light

[0004] The technical solution adopted by the present invention is as follows

[0005] A kind of self-driven moving pulley type film-forming fluid during coring device for coring while drilling, including a coring barrel, a central rod is sleeved inside the coring barrel, a coring barrel steel wire fixing mechanism is fixed at the upper end of the coring barrel, a central rod steel wire fixing mechanism is fixed at the upper end of the central rod, a movable piston is sleeved between the coring barrel and the central rod, a moving pulley is installed on the movable piston, a steel wire bypasses around the moving pulley, one end of the steel wire is connected to the coring barrel steel wire fixing mechanism, and the other end of the steel wire is connected to the central rod steel wire fixing mechanism; an A liquid self-isolation storage cavity is formed among the coring barrel, the central rod, the movable piston and the coring barrel steel wire fixing mechanism, a fixed piston is fixed at the lower end of the central rod, and a B liquid self-isolation storage cavity is formed among the coring barrel, the central rod, the movable piston and the fixed piston; the lower end of the fixed piston is connected with an A liquid and B liquid mixing mechanism, an A liquid self-moving flow channel hose is connected between the movable piston and the fixed piston, the A liquid self-isolation storage cavity is communicated with the A liquid and B liquid mixing mechanism through the movable piston, the A liquid self-moving flow channel hose and the fixed piston, and the B liquid self-isolation storage cavity is communicated with the A liquid and B liquid mixing mechanism through the fixed piston.

[0006] During the coring process, the coring barrel moves downward to drill the core, and the central rod remains stationary. By limiting the moving pulley and the movable piston with the steel wire, the displacement of the movable piston relative to the central rod is half of the displacement of the coring barrel relative to the central rod, so the compressed distances of the A liquid self-isolation storage cavity and the B liquid self-isolation storage cavity are always the same. The self-driven A liquid and B liquid are uniformly and synchronously transported into the A liquid and B liquid mixing mechanism to be mixed to form a film-forming liquid, which covers the surface of the core.

[0007] The present invention uses a moving pulley to drive the movable piston to move, which can ensure that the A liquid and the B liquid are always mixed at the same conveying speed, ensuring the quality of the film-forming liquid. During the coring process, the coring barrel moves relative to the central rod, and the movable piston moves automatically without other driving mechanisms and control mechanisms.

[0008] Since the space between the central rod and the coring barrel can be fully utilized for self-isolation storage of the film-forming liquid, no additional liquid storage container is required, and the liquid storage capacity is greatly improved, which can improve the in-situ film-forming stability.

[0009] The structure of the moving pulley piston self-isolation liquid storage type device is simple, it can withstand the harsh deep in-situ environment, has a high integration degree with the coring device, can realize stable self-isolation and self-transport of the film-forming liquid, and is suitable for the implementation of deep in-situ film-forming engineering during coring while drilling.

[0010] The components of the moving pulley piston self-isolation liquid storage type device occupy a small space, and the saved space can be used to take longer core samples, greatly improving the efficiency of the coring operation.

[0011] As a preferred embodiment of the present invention, the steel rope passes through the steel rope fixing mechanism of the core barrel. A steel rope sealing ring is arranged between the steel rope and the steel rope fixing mechanism of the core barrel, and a sealing ring pressing nut is connected to the upper end of the steel rope fixing mechanism of the core barrel. The steel rope sealing ring is located inside the steel rope fixing mechanism of the core barrel and fills the cavity below the sealing ring pressing nut. The steel rope will penetrate upward through the cavity of the steel rope sealing ring and the sealing ring pressing nut. Through the compaction effect of the sealing ring pressing nut on the multiple steel rope sealing rings below it, the steel rope sealing ring will expand radially and fill the gap between the steel rope and the steel rope sealing ring. In this way, the requirement of sealing the A liquid self-isolation storage cavity will be achieved.

[0012] As a preferred embodiment of the present invention, a first pressure gauge is connected to the steel rope fixing mechanism of the core barrel. An A liquid hydraulic channel communicating with the A liquid self-isolation storage cavity is arranged inside the steel rope fixing mechanism of the core barrel, and the first pressure gauge is communicated with the A liquid hydraulic channel. By using the first pressure gauge, the pressure value inside the A liquid self-isolation storage cavity can be measured in real time.

[0013] As a preferred embodiment of the present invention, a second pressure gauge is connected to the central rod. A B liquid hydraulic channel communicating with the B liquid self-isolation storage cavity is arranged inside the central rod, and the second pressure gauge is communicated with the B liquid hydraulic channel. By using the second pressure gauge, the pressure value inside the B liquid self-isolation storage cavity can be measured in real time.

[0014] As a preferred embodiment of the present invention, a first A liquid migration channel is arranged inside the movable piston, and a second A liquid migration channel is arranged on the fixed piston. The A liquid self-isolation storage cavity, the first A liquid migration channel, the A liquid self-migration flow channel hose, the second A liquid migration channel and the A liquid B liquid mixing mechanism are communicated in sequence; a B liquid migration channel is also arranged on the fixed piston, and the B liquid self-isolation storage cavity, the B liquid migration channel and the A liquid B liquid mixing mechanism are communicated in sequence.

[0015] As a preferred embodiment of the present invention, an A liquid collecting channel, a B liquid collecting channel and an A liquid B liquid mixing channel which are communicated with each other are arranged inside the A liquid B liquid mixing mechanism. The A liquid collecting channel is communicated with the second A liquid migration channel, and the B liquid collecting channel is communicated with the B liquid migration channel.

[0016] As a preferred embodiment of the present invention, check valves are connected inside both the A liquid collecting channel and the B liquid collecting channel.

[0017] As a preferred embodiment of the present invention, a static mixer is connected inside the A liquid B liquid mixing channel.

[0018] As a preferred embodiment of the present invention, a bottom sealing mechanism is connected to the bottom of the core barrel. During the process of the core entering the core barrel, the bottom sealing mechanism with a petal-shaped structure can automatically open and fit the core, align the core in the center, and at the same time seal the bottom of the core barrel to prevent a large amount of film-forming liquid from leaking.

[0019] As a preferred embodiment of the present invention, core claws are provided on the inner wall of the lower end of the core barrel. After sufficient core drilling footage is achieved, the core barrel and the central rod are lifted upwards, and the core claws break off the core.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. The present invention uses a movable pulley to drive the movement of the movable piston, which can ensure that liquid A and liquid B are always mixed at the same conveying speed, guaranteeing the quality of the film-forming liquid. During the core-taking process, the core barrel moves relative to the central rod, and the movable piston moves automatically without the need for other driving mechanisms and control mechanisms.

[0022] 2. Since the space between the central rod and the core barrel can be fully utilized for self-isolated storage of the film-forming liquid, without the need for an additional liquid storage container, the liquid storage capacity is greatly increased, and the in-situ film-forming stability can be improved.

[0023] 3. The structure of the movable pulley piston self-isolated liquid storage device is simple, can withstand the harsh deep in-situ environment, has a high integration degree with the core sampler, can achieve stable self-isolation and self-transport of the film-forming liquid, and is suitable for the implementation of deep in-situ drilling with film-forming engineering.

[0024] 4. The components of the movable pulley piston self-isolated liquid storage device occupy a small space, and the saved space can be used to take longer core samples, greatly improving the efficiency of the core-taking operation. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of the present invention before core-taking;

[0026] Figure 2 is Figure 1 a partial enlarged view of part A in

[0027] Figure 3 is Figure 1 a partial enlarged view of part B in

[0028] Figure 4 is Figure 1 a partial enlarged view of part C in

[0029] Figure 5 is a schematic structural diagram of the present invention during the core-taking process;

[0030] Figure 6 is a schematic structural diagram of the present invention when the core-taking is completed.

[0031] In the figure: 1 - First pressure gauge; 2 - Central rod wire fixing mechanism; 3 - Central rod; 4 - Wire rope; 5 - Seal ring compression nut; 6 - Wire rope seal ring; 7 - Core barrel wire rope fixing mechanism; 8 - B liquid hydraulic channel; 9 - Core barrel; 10 - A liquid self - isolation storage cavity; 11 - Movable pulley; 12 - Movable piston; 13 - First A liquid migration channel; 14 - A liquid self - migration flow path hose; 15 - B liquid self - isolation storage cavity; 16 - Fixed piston; 17 - B liquid migration channel; 18 - A liquid and B liquid mixing mechanism; 19 - Check valve; 20 - Static mixer; 21 - Core gripper; 22 - Bottom sealing mechanism; 23 - Core; 24 - Top film - forming space; 25 - Side film - forming space; 26 - Bottom film - forming space; 27 - Second pressure gauge; 28 - A liquid hydraulic channel; 29 - Second A liquid migration channel. Detailed implementation manners

[0032] To make the objectives, 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 with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0034] As Figures 1 to 6As shown in the figure, the moving pulley self-driven transporting and film-forming liquid while-drilling film-forming coring device of this embodiment includes a coring barrel 9. A central rod 3 is sleeved inside the coring barrel 9. A coring barrel steel wire fixing mechanism 7 is fixed at the upper end of the coring barrel 9. A central rod steel wire fixing mechanism 2 is fixed at the upper end of the central rod 3. A movable piston 12 is sleeved between the coring barrel 9 and the central rod 3. A moving pulley 11 is installed on the movable piston 12. A steel wire 4 bypasses around the moving pulley 11. One end of the steel wire 4 is connected to the coring barrel steel wire fixing mechanism 7, and the other end of the steel wire 4 is connected to the central rod steel wire fixing mechanism 2. An A-liquid self-isolation storage cavity 10 is formed among the coring barrel 9, the central rod 3, the movable piston 12 and the coring barrel steel wire fixing mechanism 7. A fixed piston 16 is fixed at the lower end of the central rod 3. A B-liquid self-isolation storage cavity 15 is formed among the coring barrel 9, the central rod 3, the movable piston 12 and the fixed piston 16. The lower end of the fixed piston 16 is connected with an A-liquid and B-liquid mixing mechanism 18. An A-liquid self-transporting flow channel hose 14 is connected between the movable piston 12 and the fixed piston 16. The A-liquid self-isolation storage cavity 10 is communicated with the A-liquid and B-liquid mixing mechanism 18 through the movable piston 12, the A-liquid self-transporting flow channel hose 14 and the fixed piston 16. The B-liquid self-isolation storage cavity 15 is communicated with the A-liquid and B-liquid mixing mechanism 18 through the fixed piston 16.

[0035] During the coring process, the coring barrel 9 moves downward to drill the core 23, and the central rod 3 remains stationary. The steel wire 4 is pulled through the moving pulley 11. The displacement of the movable piston 12 relative to the central rod 3 is half of the displacement of the coring barrel 9 relative to the central rod 3. Then the compressed distances of the A-liquid self-isolation storage cavity 10 and the B-liquid self-isolation storage cavity 15 are always the same. The A-liquid and the B-liquid enter the A-liquid and B-liquid mixing mechanism 18 to be mixed to form a film-forming liquid, which covers the surface of the core 23.

[0036] The present invention uses the moving pulley 11 to drive the movable piston 12 to move, which can ensure that the A-liquid and the B-liquid are always mixed at the same conveying speed, ensuring the quality of the film-forming liquid. During the coring process, the coring barrel 9 moves relative to the central rod 3, and the movable piston 12 moves automatically without other driving mechanisms and control mechanisms.

[0037] Since the space between the central rod 3 and the coring barrel 9 can be fully utilized for self-isolation storage of the film-forming liquid, no additional liquid storage containers are required, and the liquid storage capacity is greatly improved, which can improve the in-situ film-forming stability.

[0038] The structure of this moving pulley piston self-isolation liquid storage device is simple, can withstand the harsh deep in-situ environment, has a high integration degree with the coring device, can realize stable self-isolation and self-transportation of the film-forming liquid, and is suitable for the implementation of deep in-situ while-drilling film-forming projects.

[0039] The components of this moving pulley piston self-isolation liquid storage device occupy a small space. The saved occupied space can be used to take longer-sized core 23 samples, greatly improving the efficiency of the coring operation.

[0040] Among them, the self-isolation storage cavity 10 of liquid A is an annular space formed by enclosing the core barrel 9, the central rod 3, the core barrel steel wire fixing mechanism 7, and the movable piston 12. The self-isolation storage cavity 15 of liquid B is an annular space formed by enclosing the core barrel 9, the central rod 3, the movable piston 12, and the fixed piston 16. A first liquid A migration channel 13 is arranged inside the movable piston 12, and a second liquid A migration channel 29 is arranged on the fixed piston 16. The self-isolation storage cavity 10 of liquid A, the first liquid A migration channel 13, the liquid A self-migration flow channel hose 14, the second liquid A migration channel 29, and the liquid A and liquid B mixing mechanism 18 are connected in sequence; a liquid B migration channel 17 is also arranged on the fixed piston 16, and the self-isolation storage cavity 15 of liquid B, the liquid B migration channel 17, and the liquid A and liquid B mixing mechanism 18 are connected in sequence.

[0041] The chemical reagents that generate curing reactions in the film-forming liquid are divided into two components, liquid A (such as silicone rubber / epoxy resin, etc.) and liquid B (such as silicone rubber cross-linking agent / epoxy resin curing agent, etc.), which are respectively pre-stored in isolation in the self-isolation storage cavity 10 of liquid A and the self-isolation storage cavity 15 of liquid B isolated by the movable piston 12; before coring, liquid A and liquid B do not come into contact and do not undergo cross-linking and curing reactions.

[0042] The movable piston 12 is installed in the annular space between the central rod 3 and the core barrel 9 and can slide relative to the central rod 3 and the core barrel 9; it is located in the middle position of the core barrel 9, so that the liquid storage spaces of the self-isolation storage cavity 10 of liquid A and the self-isolation storage cavity 15 of liquid B are equal. Its uppermost end is an embedded movable pulley 11, and this movable pulley 11 can be connected to 4 or more steel wires 4. One end of the steel wire 4 is fixed to the core barrel steel wire fixing mechanism 7 and forms a binding connection with the core barrel 9; the other end passes through the core barrel steel wire fixing mechanism 7 and is fixed to the central rod steel wire fixing mechanism 2 and forms a binding connection with the central rod 3. In this way, when the central rod 3 is stationary and the core barrel 9 undergoes displacement, the movable piston 12, the steel wire 4, the core barrel 9, and the central rod 33 will form a movable pulley mechanism.

[0043] During the coring process, the core barrel 9 moves downward to drill the core 23, and the central rod 3 remains stationary. The relative movement between the core barrel 9 and the central rod 3 reduces the liquid storage space in the core barrel 9, increases the liquid pressure, and triggers the automatic migration of liquid A and liquid B. This system controls the uniform and synchronous compression of the spaces of the self-isolation storage cavity 10 of liquid A and the self-isolation storage cavity 15 of liquid B through a certain mechanical structure and migrates liquid A and liquid B to ensure the in-situ uniform mixing of liquid A and liquid B and generate a high-quality film-forming liquid, so as to achieve the in-situ and efficient preservation of the core 23. The implementation method is as follows:

[0044] Set the downward movement speed of the core barrel 9 as v. The movable piston 12 moves downward under the frictional force of the inner wall of the core barrel 9, and its speed is between 0 and v. The movable piston 12 is located between the A-liquid self-isolation storage cavity 10 and the B-liquid self-isolation storage cavity 15, controlling the synchronous and uniform compression of the A-liquid self-isolation storage cavity 10 and the B-liquid self-isolation storage cavity 15, which is equivalent to controlling the downward movement speed of the movable piston 12 as 1 / 2v.

[0045] Control the downward movement speed of the movable piston 12 as 1 / 2v through two steps:

[0046] 1) By setting the viscosity of liquid A much greater than that of liquid B, the migration viscous resistance of liquid B is smaller than that of liquid A and it is easier to migrate. The B-liquid self-isolation storage cavity 15 will have a faster compression trend than the A-liquid self-isolation storage cavity 10. At this time, the movable piston 12 has a tendency to move downward with a speed ≥ 1 / 2v.

[0047] 2) By setting multiple sets of movable pulley 11 structures, the steel rope 4 bypasses the movable pulley 11 on the movable piston 12, and the two ends are respectively bound and connected to the core barrel 9 and the central rod 3. According to the principle of the movable pulley 11, under the traction of the steel rope 4, the downward movement speed of the movable piston 12 cannot exceed 1 / 2v.

[0048] Through the above steps, the downward movement speed of the movable piston 12 can be limited to exactly 1 / 2v. The movable piston 12 will always remain in the middle position between the A-liquid self-isolation storage cavity 10 and the B-liquid self-isolation storage cavity 15, ensuring the uniform and synchronous compression of the A-liquid self-isolation storage cavity 10 and the B-liquid self-isolation storage cavity 15, and the uniform and synchronous migration of liquid A and liquid B.

[0049] Furthermore, the steel rope 4 passes through the core barrel steel rope fixing mechanism 7. A steel rope sealing ring 6 is arranged between the steel rope 4 and the core barrel steel rope fixing mechanism 7. The upper end of the core barrel steel rope fixing mechanism 7 is connected with a sealing ring pressing nut 5. The steel rope sealing ring 6 is located inside the core barrel steel rope fixing mechanism 7 and fills the cavity below the sealing ring pressing nut 5. The steel rope 4 will penetrate upward through the cavity of the steel rope sealing ring 6 and the sealing ring pressing nut 5. Through the pressing action of the sealing ring pressing nut 5 on the multiple steel rope sealing rings 6 below it, the steel rope sealing ring 6 will generate radial expansion and fill the gap between the steel rope 4 and the steel rope sealing ring 6. In this way, the sealing requirement of the A-liquid self-isolation storage cavity 10 will be achieved.

[0050] Further, a first pressure gauge 1 is connected to the core barrel wire fixing mechanism 7. An A - liquid hydraulic channel 28 communicating with the A - liquid self - isolation storage cavity 10 is arranged inside the core barrel wire fixing mechanism 7, and the first pressure gauge 1 is communicated with the A - liquid hydraulic channel 28. By using the first pressure gauge 1, the pressure value inside the A - liquid self - isolation storage cavity 10 can be measured in real time. A second pressure gauge 27 is connected to the central rod 3. A B - liquid hydraulic channel 8 communicating with the B - liquid self - isolation storage cavity 15 is arranged inside the central rod 3, and the second pressure gauge 27 is communicated with the B - liquid hydraulic channel 8. By using the second pressure gauge 27, the pressure value inside the B - liquid self - isolation storage cavity 15 can be measured in real time.

[0051] An A - liquid and B - liquid mixing mechanism 18 is provided with an A - liquid collecting channel, a B - liquid collecting channel and an A - liquid and B - liquid mixing channel which are communicated with each other. The A - liquid collecting channel is communicated with the second A - liquid migration channel 29, and the B - liquid collecting channel is communicated with the B - liquid migration channel 17. One - way valves 19 are connected in both the A - liquid collecting channel and the B - liquid collecting channel. A static mixer 20 is connected in the A - liquid and B - liquid mixing channel.

[0052] The bottom of the core barrel 9 is connected with a bottom sealing mechanism 22. During the process of the core 23 entering the core barrel 9, the bottom sealing mechanism 22 with a petal - like structure can automatically open and fit the core 23, align the core 23 in the center, and at the same time seal the bottom of the core barrel 9 to prevent a large amount of film - forming liquid from leaking. Core claws 21 are arranged on the inner wall at the lower end of the core barrel 9. After drilling enough core - taking footage, the core barrel 9 and the central rod 3 are lifted upwards, and the core claws 21 break off the core 23.

[0053] Working process:

[0054] 1) State before core - taking (as Figures 1 to 4 shown):

[0055] The A - liquid and the B - liquid are respectively pre - stored in isolation in the A - liquid self - isolation storage cavity 10 and the B - liquid self - isolation storage cavity 15.

[0056] 2) State during core - taking (as Figure 5 shown):

[0057] When starting the coring operation, the central rod 3 is connected to the coring tool fixing component and remains stationary, while the core barrel 9 drills downward to obtain the core 23. A relative movement occurs between the central rod 3 and the core barrel 9, causing the volume of liquid A in the isolation storage cavity 10 and the volume of liquid B in the isolation storage cavity 15 to decrease. Under the action of the movable pulley 11 on the movable piston 12, the volume reduction rates of the two are the same. During the coring drilling process, liquid A and liquid B film-forming liquids are gradually released into the core barrel 9 through the second liquid A migration channel 29 and the liquid B migration channel 17 on the fixed piston 16 at the bottom end of the central rod 3 and the one-way valve 19, displacing the formation fluid in-situ and covering the surface of the core 23. During the process of the core 23 entering the core barrel 9, the bottom sealing mechanism 22 has a petal-like structure, which can automatically open and fit the core 23, aligning the core 23 in the center, and at the same time closing the bottom of the core barrel 9 to prevent a large amount of film-forming liquid from leaking.

[0058] 3) State after coring (as Figure 6 shown):

[0059] After drilling a sufficient coring footage, the core barrel 9 and the central rod 3 are lifted upward, and the core gripper 21 breaks off the core 23. The petal-like structure of the bottom sealing mechanism 22 automatically rebounds and closes, sealing the bottom of the core barrel 9. The liquid A and liquid B film-forming liquids released during drilling fill the inside of the core barrel 9, covering the top film-forming space 24, the side film-forming space 25, and the bottom film-forming space 26 of the core 23. After a period of time, a cross-linking and curing reaction occurs, forming a solid sealing film with high barrier performance to completely isolate and protect the core 23, achieving in-situ sealing, moisture preservation, and light preservation of the core 23.

[0060] The present invention is not limited to the above optional embodiments. Any person can obtain other various forms of products under the inspiration of the present invention. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the present invention, they are all within the protection scope of the present invention.

Claims

1. A moving pulley self-driven film-forming fluid type coring device while drilling, characterized in that: It includes a core barrel (9). A central rod (3) is sleeved inside the core barrel (9). A core barrel steel wire fixing mechanism (7) is fixed at the upper end of the core barrel (9). A central rod steel wire fixing mechanism (2) is fixed at the upper end of the central rod (3). A movable piston (12) is sleeved between the core barrel (9) and the central rod (3). A movable pulley (11) is installed on the movable piston (12). A steel wire (4) bypasses around the movable pulley (11). One end of the steel wire (4) is connected to the core barrel steel wire fixing mechanism (7), and the other end of the steel wire (4) is connected to the central rod steel wire fixing mechanism (2); between the core barrel (9), the central rod (3), the movable piston (12) and the core barrel steel wire fixing mechanism (7), an A-liquid self-isolation storage cavity (10) is formed. A fixed piston (16) is fixed at the lower end of the central rod (3). Between the core barrel (9), the central rod (3), the movable piston (12) and the fixed piston (16), a B-liquid self-isolation storage cavity (15) is formed; a lower end of the fixed piston (16) is connected to an A-liquid and B-liquid mixing mechanism (18). An A-liquid self-transporting flow channel hose (14) is connected between the movable piston (12) and the fixed piston (16). The A-liquid self-isolation storage cavity (10) is communicated with the A-liquid and B-liquid mixing mechanism (18) through the movable piston (12), the A-liquid self-transporting flow channel hose (14) and the fixed piston (16). The B-liquid self-isolation storage cavity (15) is communicated with the A-liquid and B-liquid mixing mechanism (18) through the fixed piston (16); A first pressure gauge (1) is connected to the core barrel steel wire fixing mechanism (7). An A-liquid hydraulic channel (28) communicated with the A-liquid self-isolation storage cavity (10) is arranged inside the core barrel steel wire fixing mechanism (7). The first pressure gauge (1) is communicated with the A-liquid hydraulic channel (28); A second pressure gauge (27) is connected to the central rod (3). A B-liquid hydraulic channel (8) communicated with the B-liquid self-isolation storage cavity (15) is arranged inside the central rod (3). The second pressure gauge (27) is communicated with the B-liquid hydraulic channel (8); A first A-liquid transporting channel (13) is arranged inside the movable piston (12). A second A-liquid transporting channel (29) is arranged on the fixed piston (16). The A-liquid self-isolation storage cavity (10), the first A-liquid transporting channel (13), the A-liquid self-transporting flow channel hose (14), the second A-liquid transporting channel (29) and the A-liquid and B-liquid mixing mechanism (18) are communicated in sequence; a B-liquid transporting channel (17) is also arranged on the fixed piston (16). The B-liquid self-isolation storage cavity (15), the B-liquid transporting channel (17) and the A-liquid and B-liquid mixing mechanism (18) are communicated in sequence; Inside the A-liquid and B-liquid mixing mechanism (18), an A-liquid collecting channel, a B-liquid collecting channel and an A-liquid and B-liquid mixing channel which are communicated with each other are arranged. The A-liquid collecting channel is communicated with the second A-liquid transporting channel (29), and the B-liquid collecting channel is communicated with the B-liquid transporting channel (17).

2. The self-driven moving film-forming fluid type core sampling device while drilling with a movable pulley according to claim 1, characterized in that: The steel rope (4) passes through the coring barrel steel rope fixing mechanism (7), a steel rope sealing ring (6) is arranged between the steel rope (4) and the coring barrel steel rope fixing mechanism (7), and a sealing ring pressing nut (5) is connected to the upper end of the coring barrel steel rope fixing mechanism (7).

3. The self-driven moving pulley type film-forming fluid while-drilling film-forming core-taking device according to claim 1, wherein: One-way valves (19) are connected in both the A liquid collecting channel and the B liquid collecting channel.

4. A self-driven moving pulley for transporting film-forming fluid and a core sampling device while drilling with film formation according to claim 1, characterized in that: A static mixer (20) is connected in the A liquid and B liquid mixing channel.

5. A self-driven moving and film-forming fluid type core sampling device while drilling with a movable pulley according to claim 1, characterized in that: A bottom sealing mechanism (22) is connected to the bottom of the coring barrel (9).

6. A kind of moving pulley self-driven transporting film-forming fluid type coring device while drilling according to any one of claims 1 to 5, characterized in that: Core claws (21) are arranged on the inner wall at the lower end of the coring barrel (9).

Images