Lunar base extreme environment large depth fidelity coring device

Abstract

The present application relates to the technical field of rock drilling, and discloses a lunar base extreme environment large-depth fidelity coring device, which comprises a coring drill bit provided with a mounting cavity and a following fluid channel, a coring barrel sleeved in the mounting cavity, an inner partition layer for forming an annular cavity between the coring barrel, an inner lining sleeve, a film coating mechanism sleeved in the inner lining sleeve, a sealing device hinged to the bottom of the inner lining sleeve and used for sealing the bottom of a rock core, and a following fluid mechanism coaxially installed at the end of the coring drill bit away from the sealing device and used in cooperation with the following fluid channel; the coring barrel is rotationally connected with the coring drill bit; the film coating mechanism is transmissionally matched with the inner lining sleeve and used for controlling the axial movement of the inner lining sleeve. The present application can achieve the hole cementation of a well wall in a lunar vacuum environment with extremely low temperature, take away the heat of the coring drill bit, simultaneously form a film while drilling, protect the internal occurrence material information and layer structure of the rock core by coating the outer side of the rock core, and ensure that the lunar rock core maintains the original and true state.

Description

Technical Field

[0001] This invention relates to the field of rock drilling technology, and more specifically, to a lunar-based extreme environment deep-depth high-fidelity coring device. Background Technology

[0002] Lunar soil and rocks possess abundant resources and energy. Obtaining accurate core samples that reflect lunar information is of great scientific significance, providing guidance for accurate lunar resource exploration and assessment, lunar base construction, and scientific exploration of lunar evolution. However, limitations such as the extreme low temperatures and vacuum environment of the moon, as well as external mechanical disturbances during core extraction, make it difficult to maintain wellbore stability during the extraction process. Furthermore, the heat generated during drilling cannot be effectively dissipated, preventing the acquisition of cores from deeper lunar layers (above 3 meters). In addition, the loss of volatile gases within the core makes it difficult to accurately reflect the in-situ geological sequence structure, physical and mechanical properties, and material resource abundance of the moon, thus reducing the scientific value of lunar-based core extraction. Therefore, it is necessary to develop lunar-based deep-depth, high-fidelity core extraction technology. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a deep, high-fidelity coring device for extreme lunar environments. The present invention can achieve cementation and protection of the borehole wall in the extremely low-temperature vacuum environment of the moon, remove the heat of the coring drill bit, and simultaneously form a film during drilling. By covering the outer surface of the core with a film, the internal material information and bedding structure of the core are protected, ensuring that the lunar core maintains its original and authentic state.

[0004] The solution adopted by this invention to solve the technical problem is:

[0005] A deep, high-fidelity coring device for extreme lunar environments includes a coring drill bit with an installation cavity and a fluid-carrying channel; a coring cylinder coaxially mounted and fitted within the installation cavity; an inner diaphragm fitted within the coring cylinder and forming an annular cavity with it; an inner liner sleeve fitted within the annular cavity; a coating mechanism fitted within the inner liner sleeve for coating the core; a sealing device hinged to the bottom of the inner liner sleeve for sealing the bottom of the core; and a fluid-carrying mechanism coaxially mounted at the end of the coring drill bit away from the sealing device and used in conjunction with the fluid-carrying channel. The coring cylinder is rotatably connected to the coring drill bit. The coating mechanism is drivenly coupled to the inner liner sleeve and is used to control the axial movement of the inner liner sleeve.

[0006] During coring, the entire device is placed vertically on the lunar surface, and the coring drill bit is controlled to extract the core. During the coring process, the coating mechanism will coat the outer and top surfaces of the core to protect them. At the same time, the coating mechanism will drive the support mechanism to deliver its internal support fluid into the support fluid channel, and discharge it through the outlet set on the coring drill bit that is connected to the support fluid channel. This effectively protects the coring drill bit during coring and effectively cools the coring drill bit during operation. At the same time, the discharged support fluid will effectively protect the well wall.

[0007] After coring is completed, the core is broken off, and the entire device and core are lifted. During this process, the coring drill bit will drive the coring cylinder downwards, and the coating mechanism will drive the inner liner sleeve downwards, so that the sealing device protects and seals the bottom of the core. After completion, the entire surface of the core will be coated with a film to protect the internal material information and bedding structure of the core, ensuring that the lunar core maintains its original and authentic state.

[0008] In some possible implementations, in order to effectively cooperate with the follow-up fluid channel to cool the coring bit during core drilling, disperse the heat generated by the coring bit, improve the drilling life of the coring bit, and prevent premature damage to the bit.

[0009] The accompanying protection mechanism includes a housing with an accompanying protection fluid chamber and coaxially mounted on the side of the coring drill bit away from the sealing device, a drain rod slidably mounted in the accompanying protection fluid chamber and connected to the coating mechanism, an upper cover mounted on the housing and forming a channel between the cover and the top of the housing, and accompanying protection fluid stored in the accompanying protection fluid chamber; the housing is provided with a conveying channel communicating with the accompanying protection fluid channel.

[0010] In some possible implementations, a one-way control valve for opening or closing the delivery channel is provided at the end of the delivery channel away from the protective fluid channel.

[0011] In some possible implementations, in order to effectively coat the outer surface of the core;

[0012] The coating mechanism includes a side coating layer that is fitted inside the inner sleeve and communicates with the inner partition to form a film-forming material cavity, a central rod that is coaxially arranged with the core drill bit and located in the film-forming cavity, and a transmission film material located in the film-forming cavity.

[0013] The central rod slides along the core and axially with the film-forming chamber, with its end away from the sealing device penetrating the core tube; the end of the central rod away from the sealing device extends into the protective liquid installation chamber and is connected to the drain rod.

[0014] In some possible implementations,

[0015] The inner diameter of the cavity of the film-forming material is the same as the outer diameter of the rock core.

[0016] In some possible implementations, in order to enable the center rod to cooperate with the side coating layer and the transmission membrane material to achieve coating of the outside of the core;

[0017] The central rod includes a core piston located inside the film-forming material cavity, a sliding shaft with one end coaxially connected to the core piston and the other end passing through the core drill bit and connected to the drain rod, and the film-forming material is disposed above the core piston; the drain rod includes a drain piston that is driven and coaxially arranged with the sliding shaft, and a sliding shaft installed on the drain piston and sliding vertically, and the sliding shaft passes through the upper cover.

[0018] In some possible implementations, in order to effectively enable the coating mechanism to apply a downward force to the inner liner sleeve;

[0019] The top of the inner partition is provided with a U-shaped channel that allows the film-forming material to exert a downward force on the inner liner sleeve; the U-shaped channel is connected to the cavity of the film-forming material.

[0020] In some possible implementations,

[0021] An annular cavity is formed between the top of the inner liner sleeve and the top of the core-taking cylinder, and the U-shaped channel communicates with the annular cavity;

[0022] After core sampling is completed, the transmission membrane material in the film-forming material cavity will be squeezed downward by the core drill bit, passing through the U-shaped channel and exerting a downward force on the inner liner sleeve. Under this force, the sealing device will seal the bottom of the core.

[0023] In some possible implementations,

[0024] The side coating layer has a cylindrical structure, and its wall thickness is the same as that of the inner partition layer; the two layers are close to each other on one side and abut against each other.

[0025] In some possible implementations,

[0026] An anti-rotation bearing is provided on the top inner side of the mounting cavity, and the top of the core sampler is connected to the anti-rotation bearing; there is a gap between the core sampler and the inner side of the mounting cavity.

[0027] In some possible implementations,

[0028] The sealing device includes multiple sets of sealing flaps evenly arranged along the circumference of the inner liner sleeve and hinged at one end to the bottom of the inner liner sleeve, as well as a bottom film layer disposed on the sealing flaps.

[0029] In some possible implementations,

[0030] The side coating layer, transmission membrane material, and bottom film-forming layer are all made of the same viscoelastic polymer material.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] This invention effectively protects the coring drill bit and wellbore through the accompanying protection mechanism, which can effectively extend the service life of the coring drill bit; it can effectively ensure that the strength of the wellbore is not lost after coring, thus creating conditions for obtaining deep lunar bedrock.

[0033] This invention effectively achieves coating of the outer surface of the rock core through the cooperation of a coating mechanism, a side coating layer, and a sealing device; forming an integrated, uniform, seamless, and completely sealed membrane material on all surfaces of the rock core. The membrane material exerts its barrier properties to effectively prevent the volatilization of gaseous substances in the rock core, protect the original material information inside the rock core, and improve the value of the core.

[0034] In this invention, viscoelastic polymer materials are used to make the side coating layer, transmission membrane material, and bottom film layer, so that the coating on the outside of the rock mass has good self-healing, self-forming and barrier properties; effectively protecting the original bedding and mechanical properties of lunar bedrock. Attached Figure Description

[0035] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0036] Figure 2 This is a schematic cross-sectional view of the core sample taken in this invention, before the sealing device seals the bottom of the core sample.

[0037] Figure 3 This is a schematic diagram of the cross-sectional structure of the sealing device after sealing the bottom of the rock core in this invention;

[0038] Figure 4 for Figure 1 Enlarged view of point A in the middle;

[0039] Figure 5 for Figure 2 Enlarged view of point B in the middle;

[0040] Figure 6 for Figure 3 Enlarged view of point C in the middle;

[0041] Figure 7 This is a schematic diagram showing the connection relationship between the inner liner sleeve, the side coating layer, the sealing device, and the bottom film-forming layer during core sampling in this invention.

[0042] Figure 8 This is a schematic diagram showing the connection relationship between the inner liner sleeve, the side coating layer, the sealing device, and the bottom film-forming layer when the sealing device closes the inner liner sleeve in this invention.

[0043] The components are: 1. Center rod; 2. Core drill bit; 21. Supplementary fluid channel; 22. Outlet; 3. Anti-rotation bearing; 4. Core tube; 5. Transmission membrane material; 6. Inner liner sleeve; 7. Side coating layer; 8. Sealing device; 9. Bottom film-forming layer; 10. Top coating layer; 11. Core; 12. Inner partition; 13. Core piston; 14. Sliding shaft; 15. One-way control valve; 16. Delivery channel; 17. Sliding shaft; 18. Discharge piston; 19. Supplementary fluid. Detailed Implementation

[0044] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. For example, multiple positioning posts refer to two or more positioning posts. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] The present invention will now be described in detail.

[0046] like Figures 1-8 As shown:

[0047] A deep-penetration coring device for extreme lunar environments includes a coring drill bit 2 with an installation cavity and a fluid-carrying channel 21, a coring cylinder 4 coaxially mounted and fitted within the installation cavity, an inner partition 12 fitted within the coring cylinder 4 and forming an annular cavity with the coring cylinder 4, an inner liner sleeve 6 fitted within the annular cavity, a coating mechanism fitted within the inner liner sleeve 6 for coating the core 11, a sealing device 8 hinged to the bottom of the inner liner sleeve 6 for sealing the bottom of the core 11, and a fluid-carrying mechanism coaxially mounted at the end of the coring drill bit 2 away from the sealing device 8 and used in conjunction with the fluid-carrying channel 21; the coring cylinder 4 is rotatably connected to the coring drill bit 2; the coating mechanism is drivenly coupled to the inner liner sleeve 6 and is used to control the axial movement of the inner liner sleeve 6.

[0048] During coring, the entire device is placed vertically on the lunar surface, and the coring drill bit 2 is controlled to perform coring. During the coring process, the coating mechanism will coat the outer and top surfaces of the core 11 to protect them. At the same time, the coating mechanism will drive the follow-up protection mechanism to transport the follow-up protection fluid 19 inside to the follow-up protection fluid channel 21, and discharge it through the outlet 22 on the coring drill bit 2 that is connected to the follow-up protection fluid channel 21. This effectively protects the coring drill bit 2 during coring and effectively cools the coring drill bit 2 during operation. At the same time, the discharged follow-up protection fluid 19 will effectively protect the well wall.

[0049] After coring is completed, the core 11 is broken off, and the entire device and core 11 are lifted. During this process, the coring drill bit 2 will drive the coring cylinder 4 to move downwards. The coating mechanism will drive the inner liner sleeve 6 to move downwards, so that the sealing device 8 protects and seals the bottom of the core 11. After completion, the entire surface of the core 11 will be coated with a film. The coating protects the internal material information and layer structure of the core 11, ensuring that the lunar core maintains its original and authentic state.

[0050] In some possible implementations, in order to effectively cooperate with the follow-up fluid channel 21 to cool the core drill bit 2 during core drilling, disperse the heat generated by the core drill bit 2, improve the drilling life of the core drill bit 2, and prevent premature damage to the drill bit.

[0051] The accompanying protection mechanism includes a housing with an accompanying protection fluid chamber and coaxially mounted on the side of the core drill bit 2 away from the sealing device 8, a drain rod slidably mounted in the accompanying protection fluid chamber and connected to the coating mechanism, an upper cover mounted on the housing and forming a channel between the cover and the top of the housing, and accompanying protection fluid 19 stored in the accompanying protection fluid chamber; the housing is provided with a conveying channel 16 communicating with the accompanying protection fluid channel 21.

[0052] During core extraction, the coating mechanism will move upward, causing the side of the drain rod connected to the coating mechanism away from the core 11 to move. The drain rod will squeeze the protective fluid 19 in the protective fluid chamber, causing it to flow into the channel and enter the protective fluid channel 21 after passing through the conveying channel 16 connected to the channel.

[0053] Throughout the core drilling process, the coating mechanism applies force to the discharge rod, thereby ensuring that the protective fluid 19 in the protective fluid chamber is continuously transported into the protective fluid channel 21, thus achieving cooling of the core drill bit. The used protective fluid 19 is discharged from the outlet 22 on the core drill bit 2, and the discharged protective fluid 19 will protect the well wall.

[0054] It should be noted that the protective solution 19 is an organic mixed solution, which includes a solvent and a solution. The organic solvent and solute are mixed and completely dissolved in a certain proportion. The solvent is dichloromethane, ethanol, acetone, benzene, toluene, pentane, hexane, diethyl ether, ethyl acetate, acetone, carbon tetrachloride, etc.; the solute is cellulose polymers such as hydroxymethyl cellulose, methyl cellulose, ethyl cellulose, cellulose acetate butyrate, carboxymethyl cellulose, microcrystalline cellulose, polysulfone, polyethersulfone, polyvinylidene fluoride, etc. The applicable temperature of the protective solution 19 needs to be greater than -40℃ to ensure that the organic solvent has a high solubility.

[0055] During use, the protective fluid 19 will be discharged from outlet 22 and coated on the well wall to protect it. After being sprayed onto the well wall, the protective fluid 19 will quickly penetrate the pores, the organic solvent will evaporate rapidly, and the organic solute will remain in the pores to cement and protect the pores, thereby increasing the strength of the well wall and creating conditions for obtaining deep lunar bedrock. At the same time, through the coating mechanism during the drilling process, a dense polymer solid film with high barrier properties will be uniformly grown on the surface of the core 11. This film can preserve the volatile gas components in the core 11 and maintain the core bedding and mechanical properties, so as to truly obtain and preserve the sample in the true state of the deep in situ.

[0056] In some possible implementations, the end of the delivery channel 16 away from the protective fluid channel 21 is provided with a one-way control valve 15 for opening or closing the delivery channel.

[0057] A one-way control valve 15 is set so that the support fluid 19 in the support fluid chamber will only enter the support fluid channel 21 during core drilling. The support fluid 19 is stored in the support fluid chamber, and the one-way control valve 15 has a certain opening pressure to prevent the support fluid 19 from leaking before drilling. During core drilling, the core 11 will exert a force on the film covering mechanism, which will transmit the force to the drain rod. The drain rod will squeeze the support fluid 19, causing it to flow into the channel. At this time, the one-way control valve 15 will open due to the force provided by the support fluid 19, thereby allowing the support fluid 19 to enter the delivery channel 16 and leaving the support fluid channel 21.

[0058] During core drilling, the coring drill bit 2 generates a large amount of heat as it drills into the lunar bedrock. This heat is conducted to the fluid chamber and the coating mechanism, heating the fluid 19 in the fluid chamber and the coating material inside the coating mechanism to above -40°C. This gives the fluid 19 high solubility and fluidity, allowing the coating material to exhibit its self-forming and self-healing properties. Simultaneously, it disperses the heat generated in the coring drill bit 2, increasing its drilling life and preventing premature damage.

[0059] In some possible implementations, in order to effectively coat the outer surface of the core 11;

[0060] The coating mechanism includes a side coating layer 7 that is fitted inside the inner sleeve 6 and communicates with the inner partition 12 to form a film-forming material cavity, a central rod 1 that is coaxially arranged with the core drill bit 2 and located in the film-forming cavity, and a transmission film material 5 located in the film-forming cavity.

[0061] The central rod 1 is arranged along the axial direction of the core drill bit 2 and slides in fit with the film-forming material cavity, and its end away from the sealing device 8 passes through the core tube 4;

[0062] When covering the top of the core 11 with a film, the top film layer 10 can be set at the bottom of the core piston 13 and then drilling can be carried out; or the top film layer 10 can be set at the sampling position and then drilling can be carried out. Both of these methods can achieve the covering of the top of the core 11.

[0063] During the core sampling process, the core drill bit 2 rotates and drills towards the lunar base. The core 11 will be subjected to force by the central rod 1, and the top coating layer 10 will immediately contact the core 11 and cover the top of the core 11. During the movement, the central rod 1 cuts the side coating layer 7, so that the side coating layer 7 can cover the outside of the core 11.

[0064] In some possible implementations,

[0065] The inner diameter of the cavity of the film-forming material is the same as the outer diameter of the rock core 11. That is, the inner diameter of the side coating layer 7 is the same as the outer diameter of the rock core 11;

[0066] Preferably, the film-forming material cavity and the protective liquid cavity are arranged coaxially.

[0067] In some possible implementations, in order to effectively achieve the coating on the outside of the core 11;

[0068] The central rod 1 includes a core piston 13 located in the film-forming material cavity, a sliding shaft 14 with one end coaxially connected to the core piston 13 and the other end passing through the core drill bit 2 and connected to the drain rod, and the film-forming material is disposed above the core piston 13.

[0069] The drain rod includes a drain piston 18 that is driven and coaxially arranged with the sliding shaft 14, and a sliding shaft 17 that is mounted on the drain piston 18 and slides vertically, the sliding shaft 17 passing through the upper cover;

[0070] The space between the top of the drain piston 18 and the bottom of the top cover is used to store the protective fluid 19;

[0071] The diameter of the drain piston 18 is larger than the diameter of the sliding shaft 17.

[0072] Preferably, the outer diameter of the core piston 13 is the same as the outer diameter of the core 11;

[0073] When the side coating of the core 11 is carried out, the core piston 13 scrapes the side coating layer 7 during the core extraction process, and modifies the shape of the side coating layer 7 so that the side coating layer 7 is formed to the same diameter as the core 11, thereby reducing the resistance of the core 11 entering the core extraction cylinder 4.

[0074] The drain piston 18 is coaxially arranged and connected to the sliding shaft 14. When the sliding shaft 14 is subjected to force and moves away from the rock core 11, it will drive the drain piston 18 to move away from the rock core 11, thereby squeezing the protective fluid 19 in the protective fluid chamber, causing it to move upward and enter the channel. Preferably, the bottom of the drain piston 18 is screwed to one end of the sliding shaft 14.

[0075] In some possible implementations, in order to effectively enable the coating mechanism to apply a downward force to the inner liner sleeve 6;

[0076] The top of the inner partition 12 is provided with a U-shaped channel that allows the film-forming material to exert a downward force on the inner liner sleeve 6; the U-shaped channel is connected to the cavity of the film-forming material.

[0077] In some possible implementations,

[0078] An annular cavity is formed between the top of the inner liner sleeve 6 and the top of the core-taking cylinder 4, and the U-shaped channel communicates with the annular cavity;

[0079] After coring is completed, the core 11 is broken off, and the core drill bit 2 is controlled to continue drilling downwards, so that the bottom of the core 11 is completely inside the inner sleeve 6, and the bottom of the core 11 is above the sealing device 8. The entire device and the core 11 are lifted upwards. During the lifting process, the core piston 13 and the core sleeve 4 work together to continuously squeeze the transmission membrane material 5 above it, so that the transmission membrane material 5 passes through the U-shaped channel and enters the annular cavity, applying a downward force to the inner sleeve 6. This causes the sealing device 8, which is hinged to the bottom of the inner sleeve 6, to rotate around the hinge point, thereby protecting and sealing the bottom of the core 11. At this time, the transmission membrane material 5 above the core piston 13 will be completely squeezed into the annular cavity, and the top of the core piston 13 will abut against the top of the inner sleeve 6.

[0080] In some possible implementations,

[0081] The side coating layer 7 has a cylindrical structure, and its wall thickness is the same as that of the inner partition layer 12; the two are close to each other on one side and abut against each other.

[0082] This setup effectively ensures that the core piston 13 can move vertically in a straight line within the film-forming material cavity, allowing for the trimming of the side coating layer 7.

[0083] In some possible implementations,

[0084] An anti-rotation bearing 3 is provided on the top inner side of the mounting cavity, and the top of the core-taking cylinder 4 is connected to the anti-rotation bearing 3; there is a gap between the core-taking cylinder 4 and the inner side of the mounting cavity.

[0085] Preferably, the anti-rotation bearing 3 includes an outer ring connected to the core drill bit 2 and an inner ring fitted inside the outer ring and rotating with the outer ring. The top of the inner ring is connected to the top of the core cylinder 4. The sliding shaft 14 in the central rod 1 passes through the inner ring and extends out of the top of the core drill bit 2. During the core extraction process, the central rod 1 and the inner sleeve 6 do not rotate with the rotation of the core drill bit 2. The central rod 1 and the core cylinder 4 only move in a straight line along their axis. The central rod 1 moves away from the rock core 11, and the core cylinder 4 moves towards the rock core 11. This allows the side coating layer 7 inside the inner sleeve 6 to be scraped and trimmed, so that the coating can be applied to the outside of the rock core 11.

[0086] The anti-rotation bearing 3 is installed to prevent the core tube 4 from rotating, thereby reducing damage to the core 11 and the outer coating of the core 11.

[0087] In some possible implementations,

[0088] The sealing device 8 includes multiple sets of sealing flaps evenly arranged around the circumference of the inner liner sleeve 6 and hinged at one end to the bottom of the inner liner sleeve 6, as well as a bottom film layer 9 disposed on the sealing flaps.

[0089] Preferably, the sealing petal is petal-shaped, with one end hinged to the bottom of the inner liner sleeve 6; multiple sets of sealing petals cooperate to seal the bottom of the inner liner sleeve 6; during the core extraction process, the film-forming material on the sealing petal will be on the same inner side as the side coating layer 7; when sealing is performed after core extraction, the sealing petal rotates around the hinge point toward the side closer to the inner liner sleeve 6, so that the bottom film-forming layer 9 is located at the bottom of the core 11 and covers the bottom of the core 11;

[0090] Furthermore, the outer side of the sealing flap is inclined and slopes from top to bottom toward the side closer to the rock core 11. At the bottom of the inner liner sleeve 6, there is an inclined surface that cooperates with the sealing flap. The cooperation of the two inclined surfaces makes it easier for the sealing flap to seal the bottom of the rock core 11 during sealing.

[0091] In some possible implementations,

[0092] The top coating layer 10, the side coating layer 7, the transmission membrane material 5, and the bottom film-forming layer 9 are all made of the same material, namely viscoelastic polymer material.

[0093] The viscoelastic polymer materials described herein can be one or more of the following: polyborosiloxane, organosilicon, rubber, polyether thiourea, polyurethane, polyurethane urea, epoxy resin, polyvinyl acetate, and polycaprolactone; possessing self-forming properties, exhibiting the characteristic of creeping and stretching to form a specific shape under directional external force; possessing self-healing properties, exhibiting the characteristic of reversibly and dynamically bonding and recombining to form a complete integrated membrane after the fractured surfaces are brought into contact with external force when the coating breaks; and possessing barrier properties, capable of blocking the passage of gas molecules. These top coating layer 10, side coating layer 7, transmission membrane material 5, and bottom film-forming layer 9 can maintain their structural stability in the extreme environment of the lunar base (average lunar daytime temperature of approximately 107°C, average lunar nighttime temperature of approximately -153°C, and vacuum), but the molecular chains must maintain high activity at at least above -40°C to stably exert their self-forming and self-healing properties.

[0094] During coring, the coring drill bit 2 generates a large amount of heat, which is conducted to the fluid chamber and the coring cylinder 4, heating the fluid 19 in the fluid chamber and the film material (side coating layer 7, transmission film material 5, and bottom film-forming layer 9) inside the coring cylinder 4 to above -40°C, enabling it to exert its self-forming and self-healing properties. Simultaneously, the fluid 19 disperses the heat generated in the drill bit during coring, increasing the drilling life of the coring drill bit 2 and preventing premature drill bit damage. After coring, the film material (side coating layer 7, transmission film material 5, and bottom film-forming layer 9), and the junction points between the outer side of the core 11 and the coating layers on the top and bottom surfaces, undergo self-healing and remodeling. Ultimately, an integrated, uniform, seamless, and completely sealed film material is formed on all surfaces of the core 11. This film material exerts its barrier properties, effectively preventing the volatilization of gaseous substances from the core 11, protecting the original material information within the core 11, and enhancing the value of the coring.

[0095] Furthermore, the side coating layer 7, the bottom film-forming layer 9, and the transmission film material 5 have equal thicknesses, ranging from 1 to 3 mm.

[0096] Example:

[0097] Before core sampling using this invention, a top coating film 10 is first attached to the bottom of the core piston 13, and the device is vertically installed on the surface of the lunar rock; then drilling and core sampling are performed.

[0098] Film formation at the top of the core:

[0099] like Figure 1 As shown, during core drilling, the core drill bit 2 drills in, and the rock core 11 will enter the film-forming material cavity. The top coating film layer 10 at the bottom of the rock core piston will automatically adhere to the top of the rock core 11, forming a complete film on the top of the rock core.

[0100] Film formation on the side of the core:

[0101] like Figure 2 As shown, during the coring process, the drain rod and center rod 1 remain stationary, while the coring drill bit 2 undergoes a combined rotational and linear drilling motion. The coring drill bit 2 generates a large amount of heat as it drills into the lunar bedrock. This heat is conducted to the inside of the coring cylinder 4, heating the membrane material inside the cylinder 4 to above -40°C, enabling the membrane material to exhibit its self-forming and self-healing properties. Simultaneously, this disperses the heat generated in the drill bit, improving its drilling life and preventing premature damage.

[0102] During coring, the discharge rod remains stationary while the coring drill bit 2 rotates and performs a combined linear drilling motion. The discharge rod moves relative to the fluid chamber, causing the discharge piston 18 to compress the stored liquid space within the fluid chamber, increasing the fluid pressure to the level required to activate the one-way control valve 15. This opens the delivery channel 16, leaving a fluid channel 21, from which the fluid is sprayed out from the outlet 22. The fluid sprayed at outlet 22 undergoes a phase change at the point where the drill bit generates concentrated heat during cutting, causing the solvent to evaporate and carrying away a significant amount of heat, thus cooling the drill bit. The fluid sprayed onto the wellbore rapidly penetrates, the organic solvent evaporates quickly, and the organic solutes remain in the pores to cement and protect the borehole, increasing the wellbore strength and preventing wellbore collapse due to diameter reduction, thus creating conditions for obtaining deeper lunar bedrock laterally.

[0103] Simultaneously, during coring, the drain rod keeps the central rod 1 stationary, while the coring drill bit 2 rotates and performs a combined linear drilling motion. Through the anti-rotation bearing 3, the coring cylinder 4 can move linearly downwards without rotation, reducing damage to the lunar core 11 and the membrane material. During drilling, the central rod 1, the coring cylinder 4, and the pre-formed membrane material 7 on the side of the core generate relative movement. The core piston 13 of the central rod 1 has the same diameter as the core 11. During drilling, the side coating layer 7 is scraped and applied, shaping the side coating layer 7 of the core 11 to achieve the same diameter as the core 11, reducing the resistance of the core 11 entering the coring cylinder 4. Because the membrane material has soft, self-forming properties, it can effectively adhere to the side of the core 11 to form a uniform and complete film. Through soft contact buffering, it cushions the mechanical interference of the coring drill bit 2's impact drilling, effectively protecting the original bedding and mechanical properties of the lunar bedrock.

[0104] Film formation on the bottom surface of the rock core:

[0105] like Figure 3 As shown, after coring is completed, the bottom of the core 11 is cut off, and the core drill bit 2 and the core tube 4 continue to drill downwards for a while, while the center rod 1 remains stationary; this ensures that the bottom of the core 11 is completely inside the inner sleeve 6, and the bottom of the core 11 is above the sealing device 8.

[0106] The entire device and core 11 are lifted upwards. During this lifting process, the core piston 13 moves in opposite directions with the core drill bit 2 and the core cylinder 4, squeezing the transmission membrane material 5. This causes the transmission membrane material 5 to self-form and flow into the annular space between the core cylinder 4 and the inner partition 12, pushing the top of the inner liner sleeve 6 and forcing it to move downwards. The inner liner sleeve 6 drives the bottom sealing petal 8 of the core cylinder 4 to move downwards. The bottom of the bottom sealing petal 8 of the core cylinder 4 contacts the inclined surface of the bottom of the core cylinder 4. Under the interaction force, the bottom sealing petal 8 of the core cylinder 4 contracts inwards around the hinge support, forming a mechanical closure at the bottom of the core 11. The core bottom pre-formed membrane material 9, attached to the bottom sealing petal 8 of the core cylinder 4, also completes its closing under the mechanical assistance, adhering to the bottom of the core 11.

[0107] After coring is completed, the heat generated by the drilling of the coring brick 2 raises the temperature of the membrane material inside the coring cylinder 3 to above -40℃, giving the membrane material self-healing capabilities. The membrane material re-bonds at the points where it was previously cored, such as the top coating layer 10 at the bottom of the central rod 1 and the top of the side coating layer 7 on the inner wall of the inner liner sleeve 6, resulting in self-healing re-reconciliation; the bottom of the side coating layer 7 on the inner wall of the inner liner sleeve 6 and the bottom film layer 9 on the sealed bottom petal 8 of the coring cylinder, resulting in self-healing re-reconciliation; and the bottom film layer 99 on the bottom of the core 11 on the sealed bottom petal 8 of the coring cylinder, after closure, coming into contact with each other, resulting in self-healing re-reconciliation. Ultimately, an integrated, uniform, seamless, and completely sealed membrane material is formed on all surfaces of the core 11. This membrane material effectively prevents the volatilization of gaseous substances from the core 11, protecting the original material information within the core 11 and enhancing the value of the coring.

[0108] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A lunar-based extreme environment deep-depth high-fidelity coring device, characterized in that, The system includes a coring bit with an installation cavity and a protective fluid channel; a coring cylinder coaxially mounted and fitted within the installation cavity; an inner partition fitted within the coring cylinder and forming an annular cavity with it; an inner liner sleeve fitted within the annular cavity; a coating mechanism fitted within the inner liner sleeve for core coating; a sealing device hinged to the bottom of the inner liner sleeve for sealing the bottom of the core; and a protective fluid channel coaxially mounted on the end of the coring bit away from the sealing device and used in conjunction with the protective fluid channel. The coring cylinder is rotatably connected to the coring bit. The coating mechanism is driven by the inner liner sleeve and used to control the liner sleeve's axial movement. The protective fluid channel includes a housing with a protective fluid cavity coaxially mounted on the side of the coring bit away from the sealing device; a drain rod slidably mounted within the protective fluid cavity and connected to the coating mechanism; a top cover mounted on the housing and forming a channel with the top of the housing; and protective fluid stored in the protective fluid cavity. The housing has a conveying channel communicating with the protective fluid channel. The coating mechanism includes a side coating layer that is fitted inside the inner sleeve and communicates with the inner partition to form a film-forming material cavity, a central rod that is coaxially arranged with the core drill bit and located in the film-forming cavity, and a transmission film material located in the film-forming cavity. The central rod slides axially with the film-forming chamber and its end away from the sealing device passes through the core-taking cylinder; the end of the central rod away from the sealing device extends into the protective liquid installation chamber and is connected to the drain rod. The top of the inner liner is provided with a U-shaped channel that allows the film-forming material to exert a downward force on the inner liner sleeve; the U-shaped channel is connected to the cavity of the film-forming material; an annular cavity is formed between the top of the inner liner sleeve and the top of the core-taking cylinder, and the U-shaped channel is connected to the annular cavity; After core sampling is completed, the transmission membrane material in the film-forming material cavity is squeezed downward by the coring drill bit, passing through the U-shaped channel and exerting a downward force on the inner liner sleeve. Under this force, the sealing device will seal the bottom of the core.

2. The lunar-based extreme environment deep-depth high-fidelity coring device according to claim 1, characterized in that, The end of the delivery channel away from the protective fluid channel is equipped with a one-way control valve for opening or closing the delivery channel.

3. The lunar-based extreme environment deep-sea coring device according to claim 1, characterized in that, The central rod includes a core piston located inside the film-forming material cavity and a sliding shaft with one end coaxially connected to the core piston and the other end passing through the core drill bit and connected to the drain rod. The film-forming material is disposed above the core piston. The drain rod includes a drain piston that is driven and coaxially arranged with the sliding shaft, and a sliding shaft that is mounted on the drain piston and slides vertically, the sliding shaft passing through the upper cover.

4. The lunar-based extreme environment deep-sea coring device according to claim 1, characterized in that, The side coating layer has a cylindrical structure, and its wall thickness is the same as that of the inner partition layer; the two layers are close to each other on one side and abut against each other.

5. The lunar-based extreme environment deep-sea coring device according to claim 1, characterized in that, The sealing device includes multiple sets of sealing flaps evenly arranged along the circumference of the inner liner sleeve and hinged at one end to the bottom of the inner liner sleeve, as well as a bottom film layer disposed on the sealing flaps.

6. A lunar-based extreme environment deep-sea coring device according to claim 5, characterized in that, The side coating layer, transmission membrane material, and bottom film-forming layer are all made of the same viscoelastic polymer material.

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