CN111999099A - Moon-based fidelity coring device and in-situ self-healing sealing method - Google Patents

Abstract

The invention discloses a moon-based fidelity coring device and an in-situ self-healing sealing method, and relates to the technical field of moon exploration and drilling; the device comprises a controller, a corer outer pipe and a coring bit positioned below the corer outer pipe, wherein a drilling mechanism connected with the coring bit is arranged in the corer outer pipe and used for applying torque and axial bit pressure to the coring bit; the coring device comprises a coring bit, a coring inner cylinder, a core sealer and a self-healing viscoelastic body, wherein the coring bit is internally provided with the coring inner cylinder, the bottom of the coring inner cylinder is provided with the core sealer, and the self-healing viscoelastic body is arranged in the coring inner cylinder, so that the self-healing viscoelastic body can move along an annular gap between the coring inner cylinder and a core in a coring process to cover and wrap the surface of the drilled core; through implementing this technical scheme, aim at solving current month base and get the technical problem that the core is difficult to obtain the fidelity core of normal position, propose in the coring inner tube of month base coring preset the visco-elastic body of self-healing, wrap gradually in the core in order to accomplish chemical seal, realize the complete cladding and the fidelity coring to the core.

Description

Moon-based fidelity coring device and in-situ self-healing sealing method

Technical Field

The invention relates to the technical field of lunar exploration and drilling, in particular to a lunar-based fidelity coring device and an in-situ self-healing sealing method.

Background

The moon drilling has great strategic significance for human to research the problems of material composition on the surface of the moon, origin of the moon, earth climate, flood phenomena of water areas, future resources and the like. But the prior lunar-based coring has the technical bottleneck of 'not getting deep and not getting true'; on one hand, the lithology of the lunar rock stratum is loose, the drilling machine is influenced by loose particles in the drilling process, the phenomena of drill sticking, mechanical disturbance and the like exist, and meanwhile, the drilling machine generates a large amount of heat in the drilling process, so that the drill bit is heated and damaged, the obtained sample is buried shallow, and a deep sample is difficult to obtain; on the other hand, the non-slip soft bag used by the existing lunar-based coring is difficult to realize the bottom sealing of the inner core barrel, so that the change of the obtained rock stratum structure and the distortion of the internal material information are caused, and the true fidelity coring is difficult to realize.

Aiming at the problems that the existing lunar-based coring uses a non-slip soft bag to seal the bottom of an inner coring barrel so as to finish the acquisition of a core, and the non-slip soft bag is commonly used for super-elastic alloy sealing, tightening ring type sealing, tightening guy cable type sealing, torsion type sealing and the like, the inventor of the application finds that the existing lunar-based coring sealing has the following defects in the implementation process of the embodiment of the invention: the problems of large space required during inversion, difficult sealing and low sealing reliability exist; the core is not completely sealed, the sealing effect is poor, the risk that the core leaks from the bottom of the slip bag without slip exists, the fidelity core and the core bedding structure cannot be obtained, and the in-situ fidelity core is difficult to obtain, so that the method is very disadvantageous to the exploration of the in-situ physical and mechanical characteristics of the moon, the accurate evaluation of the moon resource potential, the determination of the existence and state of water resources, the acquisition of special substances such as volatile gas and the like.

Disclosure of Invention

Aiming at the technical problems, the invention aims to provide a lunar-based fidelity coring device, aiming at solving the technical problem that the existing lunar-based coring is difficult to obtain an in-situ fidelity core, and provides a method for presetting a self-healing viscoelastic body in a coring inner cylinder of the lunar-based coring so that the core is contacted with the self-healing viscoelastic body when entering the coring inner cylinder, the self-healing viscoelastic body deforms under the action of the upward force of the core and gradually wraps the core to complete chemical sealing, and the complete wrapping and fidelity coring of the core are realized.

The technical scheme adopted by the invention is as follows:

a lunar-based fidelity coring device comprises a controller, a corer outer tube and a coring bit positioned below the corer outer tube;

a drilling mechanism connected with the coring bit is arranged in the outer tube of the coring device, the drilling mechanism comprises a push rod and a rotating mechanism, and the push rod and the rotating mechanism are respectively connected with the controller; the push rod is used for applying axial weight on bit to the core bit, and the rotating mechanism is used for applying torque to the core bit;

be provided with in the coring bit and get the core inner tube, be provided with the rock core sealer bottom getting the core inner tube, just be equipped with the viscoelastic body of self-healing in getting the core inner tube to the messenger is getting the core in-process, the viscoelastic body of self-healing can along get the annular gap motion between core inner tube and the rock core, get the surface of rock core with the parcel brill.

Aiming at the technical problem that the existing lunar-based coring is 'unreal' in the prior art, researches find that the basic reason of the problem is that the design is difficult to change by adopting mechanical structure sealing, and the weight of the equipment is increased; the technical scheme includes that the self-healing viscoelastic body is applied to the lunar-based coring, and is preset in a coring inner cylinder of the lunar-based coring, so that a rock core is contacted with the self-healing viscoelastic body when entering the coring inner cylinder, the self-healing viscoelastic body deforms under the action of upward force of the rock core and gradually wraps the rock core to complete chemical sealing, and finally the bottom of the coring inner cylinder is completely sealed by combining mechanical structure sealing and chemical sealing, so that the rock core can be completely wrapped, and a drill rock core layer structure is kept; the self-healing viscoelastic body serves as an independent part and is convenient to take out from the core taking device after the core is coated, so that the complete coating and the fidelity coring of the core are realized.

Preferably, in the above technical solution, a bearing is connected to the top of the coring inner cylinder, so that the coring inner cylinder is connected to the coring bit through the bearing. By adopting the structure, the rotation of the extracted rock core along with the coring drill bit can be effectively avoided, and the protection of drilling and coring is facilitated.

Preferably, the core sealer comprises a plurality of petals which can be opened and closed, and the petals are made of metal materials with elasticity and memory so as to be restored to an original state after being stressed and deformed; a plurality of petals are fixed at the bottom of the coring inner cylinder and seal the bottom port of the coring inner cylinder when the coring inner cylinder is closed. So, when the core got into the coring section of thick bamboo, the petal piece of its bottom core sealer opened, and the petal piece is made by the metal material that has good elasticity and memory, can resume original state rapidly after the atress warp to realize automatic opening and shutting and close, need not extra power equipment, have better practicality.

Preferably, the core sealer is in a shape of a circular truncated cone when closed, and can form a disc structure surface adapted to the inner diameter of the coring inner cylinder, and the disc structure surface has a protruding side facing the inner side of the coring inner cylinder, so that after coring, a core positioned in the coring inner cylinder is in contact with the protrusion. By adopting the structure, the core sealer closes and holds the bottom of the core after completely coring so as to enable a gap for accommodating the self-healing viscoelastic body to be formed between the bottom of the core and the petal bulges and enable the self-healing viscoelastic body to form a complete protective film layer at the bottom of the core.

Preferably, the self-healing viscoelastic body is made of polysiloxane, boric acid series acid and lamellar filler; preferably, the polysiloxane is any hydroxyl-terminated polysiloxane or any amino-terminated polysiloxane having a viscosity of 10 to 100000 mpa.s; further, the polysiloxane is one or more of hydroxyl-terminated polydimethylsiloxane, amino-terminated polyphenyl methyl siloxane, hydroxyl-terminated polyphenyl methyl siloxane and amino-terminated polydimethylsiloxane; the boric acid series acid is one or more of boric acid, 4-hydroxyphenylboronic acid, 2-aminophenylboronic acid, 4-carboxyphenylboronic acid and phenylboronic acid; the lamellar filler is one or more of boron nitride, montmorillonite (especially modified montmorillonite), graphene, Mxene and layered double hydroxide.

Preferably, a following protection mechanism is arranged between the drilling mechanism and the core bit, the lower end of the following protection mechanism is fixedly connected with the core bit, and the upper end of the following protection mechanism is connected with the drilling mechanism, so that the following protection liquid arranged in the outer tube of the core device is discharged to a well through the following protection mechanism in the core taking process. The technical scheme is that the following protective liquid is applied to the month-based coring, and in the coring process, the following protective liquid arranged in an outer tube of a coring device is discharged to a well by using a following protective mechanism, so that the following protective liquid can permeate into surrounding rock stratums and quickly volatilize along with a solvent in the protective liquid under the vacuum action of the moon to take away heat; on one hand, the solvent is volatilized to take away a large amount of heat, so that the coring bit can be cooled in real time, the long-term use of the coring bit is facilitated, and the smooth drilling is ensured; on the other hand, the solvent is volatilized to leave the polymer in the pores of the rock stratum, and the polymer and the rock stratum are subjected to solidification and cementation to form a hard stable layer, so that the phenomena of sticking of a drill and the like can be prevented, and the smooth operation of the large-depth fidelity coring is ensured.

Preferably, the following protection mechanism comprises a following protection cylinder and a piston, the piston is arranged between the drilling mechanism and the following protection cylinder and fixedly connected with the drilling mechanism and the following protection cylinder, and the following protection cylinder and the core bit are integrally connected so that the piston can move downwards under the pushing of the drilling mechanism; and a following protective liquid flow channel is arranged in the following protective cylinder, and a liquid storage cavity for containing the following protective liquid is arranged between the following protective cylinder and the outer tube of the core taking device, so that the following protective liquid arranged in the liquid storage cavity can enter the following protective liquid flow channel in the downward moving process of the piston and is discharged outside through a discharge port arranged on a drill bit of the core taking drill.

Preferably, the upper part of the outer tube of the coring device is internally provided with an inflating mechanism fixedly connected with the outer tube of the coring device, and the inflating mechanism is connected with the controller, so that in the coring process, the controller can control the inflating mechanism to expand along the radial direction of the outer tube of the coring device to extrude the well wall, and the outer tube of the coring device is centered in the radial direction and fixed in the axial direction through the friction force between the inflating mechanism and the well wall. According to the technical scheme, the air inflation mechanism arranged on the upper part of the outer pipe of the coring device expands along the radial direction of the outer pipe of the coring device to extrude the well wall, and the outer pipe of the coring device is centered in the radial direction and fixed axially through the friction force between the air inflation mechanism and the well wall, so that the outer pipe of the coring device and the well wall are firmly fixed; and then the core bit is pushed downwards by the drilling mechanism inside the core taking device so as to apply torque and axial bit pressure to the core bit, so that the bit pressure enough to bite into the lunar rock stratum can be applied to the core bit, the technical problem that the existing drilling device is difficult to apply downward bit pressure to the lunar rock stratum under the low gravity environment of the moon is solved, deep lunar rock is drilled, large-depth fidelity coring is realized, and the drilling efficiency and the stability of the drilling device are greatly improved.

Preferably, a hanger and a cable are arranged on the top of the outer tube of the coring device for placing the drilling device at the moon position of the drilled well.

On the other hand, the invention also provides an in-situ self-healing sealing method, which is implemented by utilizing the moon-based fidelity coring device and comprises the following steps:

before coring, firstly preparing a self-healing viscoelastic body, and then placing the prepared self-healing viscoelastic body in a coring inner cylinder of the lunar-based fidelity coring device; finally, the moon-based fidelity coring device is placed to the position where the well is drilled on the moon through the hanger and the cable;

during coring, a core is obtained by breaking rock by using a coring bit, the obtained core upwards jacks up a core sealer at the bottom of the coring inner cylinder, and the self-healing viscoelastic body deforms under the action of the upward moving force of the core and moves along an annular gap between the coring inner cylinder and the core to gradually cover and cover the surface of the drilled core;

after coring, after the core completely enters the coring inner cylinder, the core sealer is recovered to realize mechanical sealing of the bottom of the coring inner cylinder; meanwhile, the self-healing viscoelastic body flows to the bottom of the rock core, and the self-healing viscoelastic body is contacted with the rock core to generate dynamic bonding effect so as to completely cover the drilled rock core and realize in-situ chemical sealing.

Further, the preparation of the self-healing viscoelastic body comprises the following steps: mixing polysiloxane and boric acid series acid at room temperature in vacuum, stirring uniformly, adding lamellar filler, continuously mixing and stirring at room temperature in vacuum until the mixed solution is homogeneous and has no obvious particle agglomeration, and standing at room temperature; taking out the film after the film is changed from the liquid state to the solid state, placing the film in a vacuum oven, slowly heating to 120-150 ℃, maintaining for 3-4h, finally slowly cooling to room temperature, and after the film is placed for a period of time, forming the self-healing viscoelastic body.

As described above, the present invention has at least the following advantages over the prior art:

1. the moon-based fidelity coring device mainly aims at the technical problem that the existing moon-based coring is not true, and provides the application of a self-healing viscoelastic body in the moon-based coring; the self-healing viscoelastic body serves as an independent part and is convenient to take out from the core taking device after the core is coated, so that the complete coating and the fidelity coring of the core are realized.

2. The core sealer configured by the lunar-based fidelity coring device adopts the petals which are made of metal materials with good elasticity and memory, and can be quickly restored to the original state after being stressed and deformed so as to realize automatic opening and closing without additional power equipment; by adopting the structural design of the rock core sealer, the rock core sealer is closed to hold the bottom of the rock core after complete coring, and a gap for accommodating the self-healing viscoelastic body can be formed between the bottom of the rock core and the petal bulges, so that the self-healing viscoelastic body can form a complete protective film layer at the bottom of the rock core.

3. The self-healing viscoelastic body prepared by the lunar-based fidelity coring device has good plasticity, can be recycled continuously, and reduces the drilling cost; when the core enters the coring inner cylinder to be contacted with the self-healing viscoelastic body, the self-healing viscoelastic body deforms under the action of the upward force of the core, the drilled core is gradually coated, the self-healing viscoelastic body is contacted with the surface of the core under the constraint of the sealing petals at the bottom, and the self-healing effect is generated by reversible bonding of molecular dynamic bonds at the bottom of the core, so that complete sealing is realized, the physical structure of the core and the core is guaranteed, and a better foundation is laid for scientific exploration and research of lunar-based fidelity coring.

4. Aiming at the technical problem that the conventional month-based coring is not deep, a following protection mechanism is arranged between a drilling mechanism and a coring bit, and is applied to the month-based coring, and the following protection fluid can permeate into surrounding rock strata, quickly volatilizes with a solvent in the protection fluid under the action of vacuum and takes away heat; on one hand, the solvent is volatilized to take away a large amount of heat, so that the coring bit is cooled in real time, the long-term use of the coring bit is facilitated, and the smooth drilling is ensured; on the other hand, the solvent is volatilized to leave the polymer in the pores of the rock stratum, and the polymer and the rock stratum are subjected to solidification and cementation to form a hard stable layer, so that the phenomena of sticking of the drill and the like are prevented, and the smooth operation of the large-depth fidelity coring is ensured.

5. The self-healing viscoelastic body disclosed by the invention is made of materials including polysiloxane, boric acid series acid and lamellar filler, and has the capability of deforming at low temperature, better tensile property and difficulty in breaking compared with the phenomena of brittle fracture and the like of other high polymer materials at extremely low temperature; meanwhile, the self-healing viscoelastic body made of the material takes polysiloxane as a main body material, and has the advantages of radiation ozone resistance, environmental adaptation and the like.

6. According to the inflating mechanism arranged on the upper part of the outer pipe of the core taker of the lunar-based fidelity coring device, the wall of a well is extruded by the radial expansion of the inflating mechanism along the outer pipe of the core taker, the outer pipe of the core taker is radially centered and axially fixed through friction force between the outer pipe and the core taker, the outer pipe of the core taker and the wall of the well are firmly fixed, and then the core bit is pushed downwards through a drilling mechanism inside the core taker to apply bit pressure, so that bit pressure enough to eat a lunar rock stratum can be applied to the core bit; the core drill bit is cooled by the protective liquid discharged into the well and the rock stratum forms a solid and stable solidified layer, so that the drilling efficiency and the drilling depth can be greatly improved, the technical problem that the existing drilling device is difficult to apply downward drilling pressure to the lunar layer due to the low gravity environment of the lunar is solved, deep lunar rock is drilled, and powerful technical support is provided for quality-guaranteeing coring on the spot.

Drawings

The invention will be described by way of specific embodiments and with reference to the accompanying drawings, in which

FIG. 1 is a schematic illustration of a month-based fidelity coring device provided by an embodiment of the present invention prior to coring;

FIG. 2 is a schematic view of one embodiment of the core sealer of FIG. 1 in accordance with embodiments of the present invention;

FIG. 3 is a schematic view of another embodiment of the core sealer of FIG. 1 in accordance with embodiments of the present invention;

FIG. 4a is a graph of the healing efficiency of a self-healing viscoelastic at 1 wt% smectite content provided by an example of the present invention;

FIG. 4b is a graph of the healing efficiency of a self-healing viscoelastic at 2 wt% smectite content provided by an example of the present invention;

FIG. 4c is a graph of the healing efficiency of a self-healing viscoelastic at 4 wt% smectite content provided by an example of the present invention;

FIG. 4d is a graph of the healing efficiency of a self-healing viscoelastic at 8 wt% smectite content provided by an example of the present invention;

FIG. 5 is a schematic cross-sectional view taken along the direction A-A in FIG. 1 according to an embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view taken along the direction B-B in FIG. 1 according to an embodiment of the present invention;

FIG. 7 is a schematic view of a month-based fidelity coring device provided by an embodiment of the present invention during coring;

FIG. 8 is a schematic diagram of a month-based fidelity coring device provided by an embodiment of the present invention after coring.

Description of reference numerals: 1-core drill bit; 2-core sealer; 3-a helix; 4-a drain port; 5-coring the inner cylinder; 6-a bearing; 7-the outer tube of the corer; 8-a liquid following flow channel; 9-a one-way valve; 10-a piston; 11-a rotation mechanism; 12-a coupling; 13-inflation expansion ring; 14-an air reservoir; 15-a controller; 16 a hanger; 17-a cable; 18-a core; 19-a push rod; 20-a liquid storage cavity; 21-a disposable protective sleeve; 22-petal pieces; a-a self-healing viscoelastic body; b-a follow-up liquid.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

Example one

This embodiment is substantially as shown in fig. 1 to 8: the embodiment provides a month-based fidelity coring device, which mainly aims at solving the technical problem that the existing month-based coring is not true, and comprises a controller 15, a corer outer tube 7 and a coring bit 1 positioned below the corer outer tube 7, wherein a drilling mechanism connected with the coring bit 1 is arranged in the corer outer tube 7, the drilling mechanism comprises a push rod 19 and a rotating mechanism 11, and the push rod 19 and the rotating mechanism 11 are respectively connected with the controller 15; the push rod 19 is used for applying axial bit pressure to the core bit 1, the rotating mechanism 11 is used for applying torque to the core bit 1 so as to ensure that the core bit 1 drills fast, specifically, the push rod 19 can be an electric push rod or a pneumatic push rod, and the rotating mechanism 11 can specifically adopt a rotating mechanism used in the existing drilling field; preferably, the controller 15 may be built into the upper inside of the outer corer tube 7 to facilitate access to the drilling mechanism for connection of the controller 15 to the drilling mechanism by a cable 17.

The key point of this embodiment lies in being provided with coring inner tube 5 in coring drill bit 1, is provided with the rock core sealer 2 in coring inner tube 5 bottom, and is equipped with the viscoelastic body a of self-healing in coring inner tube 5 to make in coring process, the viscoelastic body a of self-healing can be along the annular clearance motion between coring inner tube 5 and the rock core 18, in order to cover the surface of parcel brill rock core 18.

Therefore, the implementation principle of the basic scheme of the embodiment is as follows: the self-healing viscoelastic body a is applied to the lunar-based coring, and particularly the self-healing viscoelastic body a is preset in the coring inner cylinder 5 of the lunar-based coring, so that the core 18 is contacted with the self-healing viscoelastic body a when entering the coring inner cylinder 5, the self-healing viscoelastic body a deforms under the action of upward force of the core 18, the drilled core 18 is gradually coated, the self-healing viscoelastic body a is completely contacted with the surface of the extracted core 18 under the constraint of the bottom core sealer 2, the bottom of the core 18 is reversibly bonded through molecular dynamic bonds to generate self-healing action on the core 18 so as to complete chemical sealing, and finally the bottom of the inner cylinder 5 is completely sealed through combining mechanical structure sealing and chemical sealing, so that the core 18 can be completely coated, and the layer structure of the drilled core 18 is kept; the self-healing viscoelastic body a serves as an independent part and is convenient to take out from the core taking device after the core 18 is coated, so that the core 18 can be completely coated and subjected to fidelity coring.

The self-healing viscoelastic body a may be a viscoelastic body having a self-healing effect in the prior art.

Further, a bearing 6 is connected to the top of the coring inner cylinder 5, so that the coring inner cylinder 5 is connected to the coring bit 1 via the bearing 6. By adopting the structure, the rotation of the extracted rock core 18 along with the coring bit 1 can be effectively avoided, and the protection of drilling the extracted rock core 18 is facilitated.

Referring to fig. 2 and 3, the core sealer 2 provided in this embodiment includes a plurality of petal pieces 22 capable of opening and closing, fig. 2 shows that the core sealer 2 has six petal pieces 22 capable of opening and closing, fig. 3 shows that the core sealer 2 has eight petal pieces 22 capable of opening and closing, in this embodiment, the core sealer 2 is provided with eight petal pieces 22 capable of opening and closing, specifically, the eight petal pieces 22 are made of metal material with elasticity and memory, such as titanium alloy or spring steel in the prior art, so as to be able to return to the original state after being deformed by a force; eight petals 22 are fixed at the bottom of the coring inner cylinder 5 and seal the bottom port of the coring inner cylinder when the coring inner cylinder is closed; preferably, the core sealer 2 provided by the embodiment has an extension end which is in threaded fit connection with the bottom of the coring inner barrel 5 at the side where the petal pieces 22 are concave. So, when core 18 got into the coring section of thick bamboo, the petal piece 22 of its bottom core sealer 2 opened, and petal piece 22 is made by the metal material that has good elasticity and memory, can resume original state rapidly after the atress warp to realize automatic opening and shutting and close, need not extra power equipment, have better practicality.

Further, the core sealer 2 is integrally in a circular truncated cone shape when closed, and can form a disc structure surface matched with the inner diameter of the coring inner cylinder 5, and one side of the disc structure surface with a bulge faces the inner side of the coring inner cylinder 5, so that after coring, the core 18 in the coring inner cylinder 5 is in contact with the bulge; by adopting the structure, the core sealer 2 closes and holds the bottom of the core 18 after the core is completely cored, so that a gap for accommodating the self-healing viscoelastic body a is formed between the bottom of the core 18 and the petal bulges, and the self-healing viscoelastic body a can form a complete protective film layer at the bottom of the core 18.

In addition, a hanger 16 and a cable 17 are provided at the top of the outer tube 7 of the corer for placing the moon-based fidelity coring device at the moon location of the drilled well; the installation of the lunar-based fidelity coring device is only a preferred solution of the present embodiment, and is not particularly limited thereto, and all existing drilling application equipment capable of installing the lunar-based fidelity coring device at the lunar position of a drilled well is included in the protection scope of the present invention.

In order to make the self-healing viscoelastic body a provided by this embodiment have good plasticity, the material selected for the self-healing viscoelastic body a provided by this embodiment includes polysiloxane, boric acid series acid, and lamellar filler; preferably, the polysiloxane is any hydroxyl-terminated polysiloxane or any amino-terminated polysiloxane having a viscosity of 10 to 100000 mpa.s; further, the polysiloxane is one or more of hydroxyl-terminated polydimethylsiloxane, amino-terminated polyphenyl methyl siloxane, hydroxyl-terminated polyphenyl methyl siloxane and amino-terminated polydimethylsiloxane; further, the mass ratio of the polysiloxane to the boric acid series acid is 100: 1-100: 100, respectively; the boric acid series acid is one or more of boric acid, 4-hydroxyphenylboronic acid, 2-aminophenylboronic acid, 4-carboxyphenylboronic acid and phenylboronic acid; the lamellar filler is one or more of boron nitride, montmorillonite (especially modified montmorillonite), graphene, Mxene and layered double hydroxide, wherein the boron nitride is particularly preferably polyhydroxy boron nitride subjected to ultrasonic treatment; the montmorillonite is particularly preferably organic montmorillonite modified by trimethyl hexadecyl ammonium bromide or L-cystine; further, the mass ratio of the polysiloxane to the filler is preferably 100: 0-100: 20.

for the selection of the material of the self-healing viscoelastic body a, fig. 4a of this embodiment shows a healing efficiency chart of the self-healing viscoelastic body with a smectite content of 1 wt%; fig. 4b shows a graph of healing efficiency for a self-healing viscoelastic at 2 wt% smectite content; fig. 4c shows a graph of healing efficiency for a self-healing viscoelastic at 4 wt% smectite content; fig. 4d shows a plot of healing efficiency for a self-healing viscoelastic at 8 wt% smectite content; according to the invention, a self-healing viscoelastic body formed by polysiloxane, boric acid and montmorillonite is selected for carrying out healing experiments, and the healing efficiency is calculated to be 100 percent (the integral value of a stress-strain curve of a healed sample/the integral value of a stress-strain curve of an original sample). It can be seen that when the montmorillonite clay is 1 wt% (fig. 1), the healing efficiency is 93.98%; when the montmorillonite clay is 2 wt% (fig. 2), the healing efficiency is 85.86%; when the montmorillonite clay is 4 wt% (fig. 3), the healing efficiency is 86.90%; when the montmorillonite clay is 8 wt% (fig. 4), the healing efficiency is 23.64%, which indicates that the low content of montmorillonite clay provides the self-healing viscoelastic body with better healing efficiency.

Of course, the specific components and the proportion range of the polysiloxane, the boric acid series acid and the lamellar filler are only selected as the preferable scheme of the self-healing viscoelastic body a in the embodiment, and compared with the phenomena of brittle fracture and the like of other high polymer materials at an extremely low temperature, the self-healing viscoelastic body has the capability of deforming at a low temperature; meanwhile, the self-healing viscoelastic body made of the material takes polysiloxane as a main body material, and has the advantages of radiation ozone resistance, environmental adaptation and the like; however, in particular, and without limitation, all viscoelastic bodies that can be used in lunar-based coring and have a self-healing effect are included in the scope of the present invention.

On the other hand, the invention also provides an in-situ self-healing sealing method, which is implemented by utilizing the moon-based fidelity coring device and comprises the following steps:

before coring, firstly preparing a self-healing viscoelastic body a, and then placing the prepared self-healing viscoelastic body a in a coring inner cylinder 5 of a lunar-based fidelity coring device; finally, the moon-based fidelity coring device is placed to the position where the well is drilled on the moon through the hanger 16 and the cable 17;

further, the preparation of the self-healing viscoelastic body comprises the following steps: mixing polysiloxane and boric acid series acid at room temperature in vacuum, stirring uniformly, adding lamellar filler, continuously mixing and stirring at room temperature in vacuum until the mixed solution is homogeneous and has no obvious particle agglomeration, and standing at room temperature; taking out the film after the film is changed from a liquid state to a solid state, placing the film in a vacuum oven, slowly heating to 150 ℃ and maintaining for 3 hours, finally slowly cooling to room temperature, and after placing for a period of time, forming the self-healing viscoelastic body;

during coring, the core bit 1 is utilized to break rock to obtain the core 18, the obtained core 18 upwards jacks up eight petal pieces 22 assembled by spring steel at the bottom of the inner core cylinder 5, the core 18 enters the inner core cylinder 5, and the inner core cylinder 5 is connected with the bearing 6 so as not to rotate along with the core bit 1; the self-healing viscoelastic body a deforms under the action of the upward movement of the rock core 18, moves along the annular gap between the coring inner cylinder 5 and the rock core 18, and gradually covers and wraps the surface of the drilled rock core 18 to realize fidelity coring;

after coring, after the core 18 completely enters the coring inner cylinder 5, the core sealer 2 is recovered by eight petal pieces 22 to realize mechanical sealing of the bottom of the coring inner cylinder 5; the core sealer 2 supports the bottom of the core 18 to prevent the core 18 from falling off, a gap for accommodating the self-healing viscoelastic body a is formed at the bottom of the core 18, the self-healing viscoelastic body a can flow into the bottom of the core 18 to be mutually contacted and generate dynamic bonding action so as to completely cover the drilled core 18, and the bottom of the core 18 is sealed by utilizing the specific self-healing capacity of the self-healing viscoelastic body a material to realize in-situ chemical sealing;

finally, the moon-based fidelity coring device is returned to the initial state by raising the push rod 19 up through the controller 15, raising the device and the acquired core 18 to the lunar surface for storage by means of the winch and cable 17.

Example two

The second embodiment is substantially the same as the first embodiment, except that: the present embodiment provides a lunar-based following device while drilling, as a preferred scheme of the first embodiment, as shown in fig. 5 and 6, in combination with the design of the sealing structure of the inner core barrel 5 of the first embodiment, the key point of the present embodiment is that a following mechanism is arranged between a drilling mechanism and a core bit 1, the lower end of the following mechanism is fixedly connected with the core bit 1, and the upper end of the following mechanism is connected with the drilling mechanism, so that a following liquid b built in an outer tube 7 of a core device is discharged to a well through the following mechanism in the coring process.

Therefore, the implementation principle of the basic scheme of the embodiment is as follows: in the month-based coring, the following protective liquid b arranged in the outer tube 7 of the coring device is discharged to a well by using a following protective mechanism in the coring process, so that the following protective liquid b can permeate into surrounding rock stratums and quickly volatilize with a solvent in the protective liquid b under the vacuum action of the moon to take away heat; on one hand, the solvent is volatilized to take away a large amount of heat, so that the coring bit 1 can be cooled in real time, the long-term use of the coring bit 1 is facilitated, and the smooth drilling is ensured; on the other hand, the solvent is volatilized to leave the polymer in the pores of the rock stratum, and the polymer and the rock stratum are subjected to solidification and cementation to form a hard stable layer, so that the phenomena of sticking of the drill and the like can be prevented, and the lunar-based coring drilling is ensured to be smoothly carried out.

The follow-up fluid b can be the follow-up fluid b applied to the technical field of drilling in the prior art, and mainly comprises a solvent for volatilizing and taking away heat of the core bit 1 and a polymer capable of performing a solidification and cementation effect with a rock stratum.

Specifically, the following protection mechanism provided by the embodiment includes a following protection cylinder 21 and a piston 10, the piston 10 is arranged between the drilling mechanism and the following protection cylinder 21 and is fixedly connected with the drilling mechanism and the following protection cylinder 21, the upper end of the piston 10 is fixedly connected with a rotating mechanism 11 in the drilling mechanism, the lower end of the piston 10 is fixedly connected with the following protection cylinder 21, and the following protection cylinder 21 and the core bit 1 are integrally connected, so that the piston 10 can move downwards under the pushing of the drilling mechanism; a follow-up protection fluid flow channel 8 is arranged in the follow-up protection cylinder 21, and a fluid storage cavity 20 for containing a follow-up protection fluid b is arranged between the follow-up protection cylinder 21 and the outer tube 7 of the core taking device, so that the follow-up protection fluid b arranged in the fluid storage cavity 20 can enter the follow-up protection fluid flow channel 8 and is discharged outside through a discharge port 4 arranged on a drill bit of the core taking drill in the downward moving process of the piston 10; by adopting the structure, the following protection mechanism provided by the embodiment has a simple structure and is ingenious in design, and the following protection liquid b which is arranged in the liquid storage cavity 20 in the process of applying the drilling pressure on the core bit 1 by utilizing the drilling mechanism can naturally enter the following protection liquid flow channel 8 through the matching design of the piston 10 and the following protection cylinder 21 and is discharged to a well through the discharge port 4 arranged on the core bit 1 without additional power equipment; the protective liquid b is discharged to a position close to the core bit 1 in a simple and convenient manner.

One end of the slave cylinder 21 close to the piston 10 is provided with a one-way valve 9, so that the slave liquid b arranged in the liquid storage cavity 20 can enter the slave liquid flow channel 8 through the one-way valve 9 in the process that the piston 10 moves downwards; therefore, the liquid in the liquid following and protecting channel 8 can not flow back to the liquid storage cavity 20, so as to be beneficial to protecting the liquid following and protecting b in the liquid storage cavity 20; combine the design of earning bit 1 upward discharge mouth 4, as the preferred of this embodiment, 1 surface at the coring bit is equipped with helix 3, so that discharge from earning mouth 4 in the well along with protecting liquid b direct by locating 3 even paintings on the wall of a well on the helix on coring bit 1 surface, this structural design is ingenious reasonable, can make along with protecting more even the painting on the wall of a well of liquid b, in order to reach the mesh of quick cooling coring bit 1, leave the polymer in making loose rock grain clearance simultaneously and take place to glue and solidify fast, reduce the drill bit temperature in real time when improving wall of a well intensity from this, the drill bit life is prolonged.

The servo protection liquid b provided by the embodiment comprises a solvent, a polymer and a filler; wherein, preferably, the solvent can be one or more of methylamine, dimethylamine, diethyl ether, pentane, dichloromethane, carbon disulfide, acetone, chloroform, methanol, tetrahydrofuran, hexane and cyclohexane; preferably, the polymer comprises one or more of cellulose diacetate, cellulose triacetate, cellulose acetate propionate, cellulose nitrate, regenerated cellulose, aromatic polyamide, nylon-66, aromatic polyamide hydrazide, polyphenylsulfone terephthaloyl, polybenzimidazole, polyimide, polysulfone, polyethersulfone, sulfonated polysulfone, polysulfonamide, polyvinyl alcohol, polyvinyl chloride, polyvinylidene fluoride, polycarbonate; further, the mass ratio of the solvent to the polymer is preferably 100: 1-100: 50; preferably, the filler may be one or more of a lamellar nanofiller, a fibrous nanofiller or a particulate filler; further, the solvent to filler ratio is preferably 100: 0-100: 100, respectively;

wherein, the lamellar nano-filler can be boron nitride, montmorillonite graphene, Mxene, layered double hydroxide and the like; the fibrous nano-filler can be cellulose nano-crystal, carbon nano-tube and the like; the granular filler can be nano calcium carbonate, nano zinc oxide, nano ferric oxide, gold granules and silver granules.

Of course, the selection of the solvent, the polymer and the filler components and the proportion range are only preferred schemes of the secondary protecting liquid b, and all the secondary protecting liquid b can be applied to the month-based coring, and the secondary protecting liquid b contains the heat-dissipating solvent and the polymer which can be solidified and cemented with the rock stratum, and the secondary protecting liquid b is included in the protection scope of the invention.

EXAMPLE III

The third embodiment is substantially the same as the first embodiment, except that: the embodiment provides a lunar-based fidelity coring device, as a preferred scheme of the first embodiment, as shown in fig. 7 and 8, in combination with the design of the sealing structure of the coring inner cylinder 5 of the first embodiment, the key point of the embodiment is that an inflation mechanism fixedly connected with the outer tube 7 of the coring device is further arranged on the upper portion of the outer tube 7 of the coring device, and the inflation mechanism is connected with the controller 15, so that during coring, the controller 15 can control the inflation mechanism to radially expand along the outer tube 7 of the coring device to press the well wall, and the outer tube 7 of the coring device is radially centered and axially fixed through friction between the inflation mechanism and the well wall.

Therefore, the implementation principle of the basic scheme of the embodiment is as follows: the air inflation mechanism arranged on the upper part of the outer tube 7 of the coring device expands along the radial direction of the outer tube 7 of the coring device to extrude the well wall, and the outer tube 7 of the coring device is centered in the radial direction and fixed axially through the friction force between the air inflation mechanism and the well wall, so that the outer tube 7 of the coring device is firmly fixed with the well wall; the coring bit 1 is pushed downwards by a drilling mechanism inside the coring device to apply torque and axial bit pressure to the coring bit 1, bit pressure enough to drill into a lunar rock stratum can be applied to the coring bit 1, the coring bit 1 is cooled by combining with a protective fluid b discharged into a well, and the stratum forms a solid and stable solidified layer, so that the drilling efficiency and the drilling depth can be greatly improved, the technical problem that the existing drilling device is difficult to apply downward bit pressure to the lunar layer due to the low gravity environment of the moon is solved, deep lunar rock is drilled, further, high-depth fidelity coring is achieved, and the technical problem that the existing lunar-based coring is not deep is solved.

Specifically, the inflation mechanism provided by the embodiment comprises an air storage cylinder 14 and an inflation expansion ring 13, wherein the air storage cylinder 14 is filled with nitrogen or inert gas and is communicated with the inflation expansion ring 13 through a controller 15, so that the controller 15 can control the nitrogen or inert gas in the air storage cylinder 14 to be discharged into the inflation expansion ring 13, the controller 15 can specifically control the valve between the air storage cylinder 14 and the inflation expansion ring 13 to be opened, after the drilling device is lowered to the well bottom, the nitrogen or inert gas in the air storage cylinder 14 is discharged into the inflation expansion ring 13, the inflation expansion ring 13 extrudes the well wall of the solidified layer after radially expanding along the outer tube 7 of the coring device, and the outer tube 7 of the coring device is radially centered and axially fixed through the friction force between the inflation expansion ring 13 and the well wall, and the structure is simple in design but ingenious and reasonable; the inflation expansion ring 13 may be made of silicon rubber or fluororubber, which has good ductility and is resistant to high and low temperature and radiation cosmic rays, and certainly, other materials which have ductility and are resistant to high and low temperature and radiation cosmic rays may be selected, and all of them are within the protection scope of the present invention.

As a preferable scheme of the air inflation mechanism, in the embodiment, the air storage cylinder 14 is arranged along the axial line of the outer tube 7 of the core taking device, and the air inflation expansion ring 13 is arranged circumferentially around the outer side of the air storage cylinder 14, so that the air inflation expansion ring 13 can expand outwards along the radial direction of the outer tube 7 of the core taking device after being inflated; by adopting the structure, the air storage cylinder 14 is arranged in the middle in the outer tube 7 of the coring device, and the inflation expansion ring 13 which is circumferentially arranged around the outer side of the air storage cylinder 14 can be expanded outwards and firmly attached to the well wall after being filled with nitrogen or inert gas, so that the drilling mechanism can apply torque and axial drilling pressure to the coring bit 1; further, the air storage cylinder 14 is configured with a plurality of inflation expansion rings 13, in this embodiment, four inflation expansion rings 13 are provided as an example, and the four inflation expansion rings 13 are uniformly arranged along the outer side of the air storage cylinder 14 in the axial direction, wherein one end of the inflation expansion ring 13 close to the air storage cylinder 14 is an inflation end, and one end of the inflation expansion ring 13 far away from the air storage cylinder 14 is an outward expansion end; the outer expanding end extends out of the outer tube 7 of the coring device and is pressed with the well wall to form surface contact after being inflated and expanded, so that the outer tube 7 of the coring device can be firmly fixed on the well wall.

On the other hand, the push rod 19 provided by the drilling mechanism of the present embodiment is preferably a pneumatic push rod 19, and the air storage cylinder 14 is communicated with the air storage cavity of the push rod 19 through the controller 15, so that the inert gas in the air storage cylinder 14 can be controlled by the controller 15 to be discharged into the air storage cavity of the push rod 19, and the push rod 19 is driven to apply axial bit pressure to the coring bit 1. Certainly, the push rod 19 is not limited to this, and the push rod 19 may also be an electric push rod 19, the push rod 19 is fixed on the inner wall of the outer tube 7 of the coring device through the coupling 12, and the electric push rod 19 is connected with the controller 15 through the cable 17 and the power supply, so that the controller 15 controls the push rod 19 to operate, and the axial bit pressure is applied to the coring bit 1.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The utility model provides a month base fidelity coring device which characterized in that: the coring device comprises a controller, a corer outer tube and a coring bit positioned below the corer outer tube;

a drilling mechanism connected with the coring bit is arranged in the outer tube of the coring device, the drilling mechanism comprises a push rod and a rotating mechanism, and the push rod and the rotating mechanism are respectively connected with the controller; the push rod is used for applying axial weight on bit to the core bit, and the rotating mechanism is used for applying torque to the core bit;

be provided with in the coring bit and get the core inner tube, be provided with the rock core sealer bottom getting the core inner tube, just be equipped with the viscoelastic body of self-healing in getting the core inner tube to the messenger is getting the core in-process, the viscoelastic body of self-healing can along it flows to get the annular gap between core inner tube and the rock core, gets the surface of rock core with the parcel brill.

2. The month-based fidelity coring device of claim 1, wherein: the top of the coring inner cylinder is connected with a bearing, so that the coring inner cylinder is connected with the coring bit through the bearing.

3. The month-based fidelity coring device of claim 1, wherein: the rock core sealer comprises a plurality of petal pieces capable of being opened and closed, and the petal pieces are made of metal materials with elasticity and memory so as to be capable of being restored to an original state after being stressed and deformed; a plurality of petals are fixed at the bottom of the coring inner cylinder and seal the bottom port of the coring inner cylinder when the coring inner cylinder is closed.

4. The month-based fidelity coring device of claim 3, wherein: the whole round platform form that is of core sealer when closed to can form and get the disc structural plane of core inner tube internal diameter size looks adaptation, disc structural plane has bellied one side and gets the core inner tube inboard towards, so that after getting the core, be located get the core in the core inner tube with the arch contacts.

5. The month-based fidelity coring device of any of claims 1-4, wherein: the self-healing viscoelastic body is made of polysiloxane, boric acid series acid and lamellar filler; preferably, the polysiloxane is any hydroxyl-terminated polysiloxane or any amino-terminated polysiloxane having a viscosity of 10 to 100000 mpa.s; further, the polysiloxane is one or more of hydroxyl-terminated polydimethylsiloxane, amino-terminated polyphenyl methyl siloxane, hydroxyl-terminated polyphenyl methyl siloxane and amino-terminated polydimethylsiloxane; the boric acid series acid is one or more of boric acid, 4-hydroxyphenylboronic acid, 2-aminophenylboronic acid, 4-carboxyphenylboronic acid and phenylboronic acid; the lamellar filler is one or more of boron nitride, montmorillonite, graphene, Mxene and layered double hydroxide.

6. The month-based fidelity coring device of claim 5, wherein: be provided with along with protecting the mechanism between drilling mechanism and the coring bit, just along with protecting mechanism lower extreme and coring bit fixed connection, along with protecting the upper end of mechanism and being connected with drilling mechanism to the messenger is in coring process, arranges the interior along with protecting the liquid of placing in the corer outer tube outside the well through along with protecting the mechanism.

7. The month-based fidelity coring device of claim 6, wherein: the following protection mechanism comprises a following protection cylinder and a piston, the piston is arranged between the drilling mechanism and the following protection cylinder and fixedly connected with the drilling mechanism and the following protection cylinder, and the following protection cylinder and the core bit are integrally connected so that the piston can move downwards under the pushing of the drilling mechanism; and a following protective liquid flow channel is arranged in the following protective cylinder, and a liquid storage cavity for containing the following protective liquid is arranged between the following protective cylinder and the outer tube of the core taking device, so that the following protective liquid arranged in the liquid storage cavity can enter the following protective liquid flow channel in the downward moving process of the piston and is discharged outside through a discharge port arranged on a drill bit of the core taking drill.

8. The month-based fidelity coring device of claim 5, wherein: the coring device outer tube upper portion embeds there is the mechanism of aerifing with coring device outer tube fixed connection, aerify the mechanism with the controller is connected to the messenger is coring in-process, and the controller can control aerify the mechanism and extrude the wall of a well along the radial inflation of coring device outer tube to make the coring device outer tube radially placed in the middle and axial fixity through aerifing frictional force between mechanism and the wall of a well.

9. An in-situ self-healing sealing method is characterized by comprising the following steps: an in-situ self-healing seal is achieved using the month-based fidelity coring device as defined in any of claims 1-8, the method comprising the steps of:

before coring, firstly preparing a self-healing viscoelastic body, and then placing the prepared self-healing viscoelastic body in a coring inner cylinder of the lunar-based fidelity coring device; finally, the moon-based fidelity coring device is placed to the position where the well is drilled on the moon through the hanger and the cable;

during coring, a core is obtained by breaking rock by using a coring bit, the obtained core upwards jacks up a core sealer at the bottom of the coring inner cylinder, and the self-healing viscoelastic body deforms under the action of the upward moving force of the core and moves along an annular gap between the coring inner cylinder and the core to gradually cover and cover the surface of the drilled core;

after coring, after the core completely enters the coring inner cylinder, the core sealer is recovered to realize mechanical sealing of the bottom of the coring inner cylinder; meanwhile, the self-healing viscoelastic body moves to the bottom of the rock core, and the self-healing viscoelastic body is contacted with the rock core to generate dynamic bonding effect so as to completely cover the drilled rock core and realize in-situ chemical sealing.

10. An in-situ self-healing sealing method is characterized by comprising the following steps: the preparation method of the self-healing viscoelastic body comprises the following steps: mixing polysiloxane and boric acid series acid at room temperature in vacuum, stirring uniformly, adding lamellar filler, continuously mixing and stirring at room temperature in vacuum until the mixed solution is homogeneous and has no obvious particle agglomeration, and standing at room temperature; taking out the film after the film is changed from the liquid state to the solid state, placing the film in a vacuum oven, slowly heating to 120-150 ℃, maintaining for 3-4h, finally slowly cooling to room temperature, and after the film is placed for a period of time, forming the self-healing viscoelastic body.

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