CN115127852A

CN115127852A - Linear cutting device and cutting method for manufacturing rock sample by utilizing freezing shape-preserving technology

Info

Publication number: CN115127852A
Application number: CN202110313198.9A
Authority: CN
Inventors: 唐永强; 崔茂蕾; 肖朴夫; 伦增珉; 王锐; 赵淑霞
Original assignee: China Petroleum and Chemical Corp; Sinopec Exploration and Production Research Institute
Current assignee: China Petroleum and Chemical Corp; Sinopec Exploration and Production Research Institute
Priority date: 2021-03-24
Filing date: 2021-03-24
Publication date: 2022-09-30

Abstract

The application provides a linear cutting device and a cutting method for manufacturing a rock sample by utilizing a freezing shape-preserving technology. The wire cutting device includes: a base; the linear cutting system is fixed on the base and comprises a cutting line, and the cutting line cuts rocks through vertical motion to obtain a rock sample; a sample moving system fixed on the base for moving the rock transversely and longitudinally during the cutting process so that the rock is cut by the cutting line; the refrigeration and heat preservation system comprises a refrigeration assembly and a heat preservation assembly, wherein the refrigeration assembly can spray a refrigerant to the cutting line and the surface of the rock to reduce the temperature; the heat preservation assembly comprises a heat preservation shell used for placing rocks under a freezing shape-preserving condition. The linear cutting device utilizes the freezing shape-preserving technology to cut loose sandstone standard columnar rock samples, the freezing shape-preserving technology is favorable for taking out complete rock samples, the contact surface of a cutting line and rocks is small, the columnar rock samples are not damaged, and the sampling success rate is greatly improved.

Description

Linear cutting device and cutting method for manufacturing rock sample by utilizing freezing shape-preserving technology

Technical Field

The invention relates to a method for manufacturing loose sandstone rock samples, in particular to a linear cutting device and a cutting method for manufacturing rock samples by utilizing a freezing shape-preserving technology.

Background

Unconsolidated sandstone reservoirs are one of the unconventional oil and gas resources. The loose sandstone reservoir usually has good physical properties, and the oil displacement efficiency of the loose sandstone reservoir is usually higher than that of a medium-low permeability reservoir. Unconsolidated sandstone reservoirs are also commonly used as oil and gas reservoirs. But loose sandstone has loose structure and is difficult to form, thereby causing great difficulty for core analysis and indoor experiments.

Particularly, the cementing degree of the high-hole and high-permeability loose sandstone core is poor, so that the coring difficulty is high, and the coring and related experimental researches on the loose sandstone are less. The most common method for making loose sandstone rock samples is to simulate loose sandstone with sand-filled tubes, sand-filled models or artificial cores (wanling, 2019; xu hong guang, etc., 2017). However, the sand-packed pipe is difficult to reflect the characteristics of loose sandstone such as stress sensitivity and anisotropy.

The actual condition of the unconsolidated sandstone reservoir can be more accurately reflected by taking a rock sample in the target reservoir through the coring well. The standard columnar rock sample obtained on the basis can be used for various rock core analysis tests and rock core displacement experiments, and has important significance for analyzing the geological characteristics of the oil reservoir and researching the oil reservoir development technology.

In the prior art, loose sandstone needs to be subjected to shape-preserving coring, and an oil-containing core sample needs to be subjected to wax sealing or freezing shape preservation (cheesemaking, etc., 2018) on an inner coring cylinder. The loose sandstone is difficult to form under the normal temperature condition, and the traditional method for drilling the columnar rock sample at the normal temperature is very easy to damage the rock core and is difficult to take out the complete rock core, so the rock sample is drilled under the condition of freezing shape preservation.

The existing methods for drilling the rock sample by freezing adopt a coring bit to drill a columnar core while manufacturing, wherein a liquid nitrogen freezing drilling technology is adopted to drill the rock sample in the patent (CN201510439121.0), and a low-temperature freezing liquid drilling technology is adopted to drill the rock sample in the patent (CN 201811211041.7).

However, during the process of freeze coring by using a drill bit, oil-bearing rock debris is generated. Because the carrying capacity of liquid nitrogen and refrigerating fluid is relatively poor, and the detritus under the low temperature condition is mixed with oil, water and is great in viscosity together, is difficult for dashing out the detritus from the drill bit, causes the drill bit to block up easily, has increased drill bit resistance, and the resistance of increase produces torsion on acting on the rock core post. When the core bit is operated at high speeds, the torsional forces acting on the core string cause the frozen loose sandstone sample to be very easily twisted off or chipped, resulting in a failed coring operation.

In addition, in the coring process, the friction between the coring bit and the core can generate heat to melt the fluid in the core, the fluid is rapidly solidified after the coring is stopped, the core and the coring bit are bonded together, the core is difficult to take out and is easy to deform and break, and the success rate of freezing and drilling the core is low.

Diamond wire cutters are widely used to cut a variety of metallic and non-metallic composite materials. Because the contact area between the diamond wire and the core is small, the acting force applied on the core is small, and the core is not easy to damage. Some technicians (Nalezny C.L., Cutting rock or free zen soil with a circular saw, 1971; Ahn K.S., Framework for invaginating with a wire saw Cutting,2020) proposed a method of Cutting a core with diamond wire. Patent (CN201810370252.1) proposes cutting soft cores with a wire cutter, and patent (cn201821977830.x, CN201911165493.3) proposes a method and apparatus for cutting conventional cores with a wire cutter. However, since the cutting target is mainly mudstone, shale, or the like, the cutting is performed at normal temperature. Meanwhile, during coring, it is usually flushed with water to flush the debris. However, the sandstone is difficult to form when being conveyed under the normal temperature condition, and the loose sandstone needs to be frozen and shape-preserved to maintain the shape, so the normal-temperature linear cutting method is not suitable for the oil-containing loose sandstone with loose texture.

Therefore, the application provides a method for cutting loose sandstone standard columnar rock samples by using a diamond wire cutting machine on the basis of freezing shape preservation. The contact surface of the carborundum line and the rock core is small, the generated rock debris is directly brought out, the rock debris cannot be accumulated, the columnar rock sample is not damaged, and the sampling success rate is greatly improved. Due to the fact that the success rate of taking the columnar rock sample is improved, the method has positive effects and practical significance on research on physical properties of the loose sandstone core, correct recognition of objective rules of an oil reservoir, guidance of development and production of the oil reservoir and improvement of resource utilization degree.

Disclosure of Invention

In view of the above problems in the prior art, the present application provides a linear cutting device and a cutting method for making a rock sample by using a freezing shape-preserving technique. The method utilizes a freezing shape-preserving technology to cut loose sandstone standard columnar rock samples by adopting a cutting line cutting device, the freezing shape-preserving technology is favorable for taking out complete rock cores, the contact surface between the cutting line and the rock cores is small, the generated rock debris is directly taken out and cannot be accumulated, the columnar rock samples are not damaged, and the sampling success rate is greatly improved. Due to the fact that the success rate of taking the columnar rock sample is improved, the method has positive effects and practical significance on research on physical properties of the loose sandstone core, correct recognition of objective rules of an oil reservoir, guidance of development and production of the oil reservoir and improvement of resource utilization degree.

In a first aspect, the present invention provides a wire-electrode cutting apparatus for producing a rock sample by using a freezing and shape-retaining technique, the wire-electrode cutting apparatus comprising: a base; the linear cutting system is fixed on the base and comprises a cutting line, and the cutting line cuts rocks through vertical motion to obtain a rock sample; a sample moving system fixed on the base for moving the rock transversely and longitudinally during cutting so that the rock is cut by the cutting line; the refrigeration and heat preservation system comprises a refrigeration component and a heat preservation component, and the refrigeration component can spray a refrigerant to the cutting line and the rock surface to reduce the temperature; the heat preservation assembly comprises a heat preservation shell used for placing the rock in a freezing conformal condition. Utilize above-mentioned wire cutting device, can adopt freezing shape preserving technique to surely get loose sandstone standard columnar rock specimen, freezing shape preserving technique is favorable to taking out complete rock core, and the contact surface of line of cut and rock core is little, and the detritus that produces is directly taken out, can not pile up, does not have the devastation to columnar rock specimen, has increased substantially the sample success rate. Due to the fact that the success rate of taking the columnar rock sample is improved, the method has positive effects and practical significance on research on physical properties of the loose sandstone core, correct recognition of objective rules of an oil reservoir, guidance of development and production of the oil reservoir and improvement of resource utilization degree.

In one embodiment of the first aspect, the wire cutting system further comprises: the upper support driving part comprises an upper shell, an upper reel and an upper guide wheel, wherein the upper reel and the upper guide wheel are arranged in the upper shell, a first end of the cutting line is wound on the upper reel, the cutting line is in contact with the upper guide wheel, and one end of the upper reel is connected with an upper motor to drive the upper reel to rotate so as to drive the cutting line to vertically move; the lower support driving part comprises a lower shell, a lower reel and a lower guide wheel, the lower reel and the lower guide wheel are arranged in the lower shell, the second end of the cutting wire is wound on the lower reel, the cutting wire is in contact with the lower guide wheel, and one end of the lower reel is connected with a lower motor to drive the lower reel to rotate so as to drive the cutting wire to vertically move; and a strut provided between the upper case and the lower case for adjusting a height of the upper support driving part. Through this embodiment, can guarantee that the line of cut only cuts at vertical removal to can utilize the pillar to adjust the height of going up support drive division, with the cutting of the not rock of adaptation co-altitude.

In one embodiment of the first aspect, the wire cutting system further comprises: the upper positioning pulley assembly comprises an upper gear connected with the upper motor, a movable upper idle pulley set and a middle upper idle pulley set, and the upper gear can drive the movable upper idle pulley set to move transversely under the driving of the upper motor so as to control and adjust the transverse position of the cutting wire for winding or withdrawing the upper reel; the middle upper idle wheel group is fixed at the transverse middle part of the upper shell; the cutting line is clamped between the two idler wheels of the movable upper idler wheel set and the two idler wheels of the middle upper idler wheel set; the lower positioning pulley assembly comprises a lower gear connected with the lower motor, a movable lower idle pulley set and a middle lower idle pulley set, and the lower gear can drive the movable lower idle pulley set to move transversely under the driving of the lower motor so as to control and adjust the transverse position of the cutting wire for winding or drawing out the lower reel; the middle lower idler pulley group is fixed in the transverse middle of the lower shell; the cutting line is sandwiched between the two idlers of the moving lower idler set and the two idlers of the middle lower idler set. This embodiment is advantageous for avoiding the detachment of the cutting line and for the regular winding or orderly withdrawal of the cutting line.

In one embodiment of the first aspect, a limit groove is formed in a middle portion of the upper guide wheel; and a limiting groove is formed in the middle of the lower guide wheel and is used for accommodating the cutting line. Through the embodiment, the limiting groove is formed in the middle of the upper guide wheel and the lower guide wheel, so that the cutting line is ensured to bypass from the middle of the guide wheels, and the cutting line can be prevented from falling off.

In one embodiment of the first aspect, the wire cutting system further comprises a wire cutting control assembly for controlling a wire travel speed of the cutting wire, which is communicatively coupled to the upper motor and the lower motor. Through this embodiment, the cutting control assembly coordinates the rotational speed of upper portion motor and lower part motor, guarantees upper portion motor and lower part motor synchronous motion to avoid the emergence of broken string, off-line.

In one embodiment of the first aspect, the wire cutting system further comprises a tensioning wheel assembly comprising a tensioning wheel, a drive link, and a tension adjustment device, wherein adjusting the amount of spring extension of the tension adjustment device via the drive link moves the tensioning wheel to tension the cutting wire in contact with the tensioning wheel. Through this embodiment, can the tensioning with the line of cut of take-up pulley contact to avoid taking place to take off the line, the wire jumper.

In one embodiment of the first aspect, the wire cutting system further comprises a cushion pad, which is disposed under the rock, for preventing the obtained rock sample from falling, and also preventing foreign materials from entering the wire cutting device. Through this embodiment, be favorable to wire cutting device's normal operating, improve the success rate of taking a sample and improve wire cutting device's life.

In one embodiment of the first aspect, the cutting wire is a diamond wire, and the diamond wire is a steel wire having diamond bonded to a surface thereof by plating metal. Through this embodiment, be favorable to improving the life of line of cut, and be difficult for causing broken string and fish tail.

In one embodiment of the first aspect, the sample moving system includes a longitudinal moving stage, a transverse moving stage and a stage stacked in a vertical direction, the longitudinal moving stage is capable of moving longitudinally relative to the base, the transverse moving stage is capable of moving transversely relative to the longitudinal moving stage and is stationary in the longitudinal direction relative to the longitudinal moving stage, and the stage is capable of being stationary relative to the transverse moving stage during cutting, so that the stage can move longitudinally and transversely during cutting to drive the rock fixed on the stage to move longitudinally and transversely. Through this embodiment, can make the objective table drive the rock longitudinal and transverse movement who fixes on the objective table, form the cutting orbit on the rock to make the rock cut by the line of cut, thereby obtain standard columnar rock sample.

In one embodiment of the first aspect, a longitudinal guide rail is arranged on the base, a longitudinal sliding block is fixed below the longitudinal moving table, a nut is fixed inside the longitudinal sliding block, a lead screw is connected between a longitudinal motor and the nut, and the longitudinal motor drives the lead screw to rotate, so that the nut and the longitudinal sliding block slide along the longitudinal guide rail to drive the longitudinal moving table to slide longitudinally; the longitudinal moving platform is provided with a transverse guide rail, a transverse sliding block is fixed below the transverse moving platform, a nut is fixed inside the transverse sliding block, a screw rod is connected between a transverse motor and the nut, and the transverse motor drives the screw rod to rotate, so that the nut and the transverse sliding block slide along the transverse guide rail to drive the transverse moving platform to transversely slide. This embodiment is advantageous in accurately controlling the moving speed of the vertical moving stage and the horizontal moving stage.

In one embodiment of the first aspect, the specimen movement system further comprises a movement control assembly communicatively coupled to the longitudinal motor and the transverse motor to control the coordinate position of the stage during the cutting process. Through the embodiment, the movement control assembly controls the rotating speed of the longitudinal motor and the transverse motor, so that the coordinate position of the object stage is accurately controlled in the cutting process.

In one embodiment of the first aspect, the sample movement system further comprises a rock securing assembly comprising: a rock securing base securable to the stage; the slideway is arranged on the top surface of the rock fixing base; a first fixed slider capable of sliding along the slide way; a second fixed slider capable of sliding along the slide; the position adjusting assembly is used for adjusting the distance between the first fixed slide block and the second fixed slide block so as to clamp or release the rock wrapped in the heat insulation material; in the cutting process, the heat insulation material is arranged in a avoiding cutting area. By this embodiment, the distance between the first and second stationary slides is adjusted to clamp or release rocks wrapped inside the insulation material.

In one embodiment of the first aspect, the refrigeration component of the refrigeration and heat preservation system comprises a liquid nitrogen container, a liquid nitrogen transmission line and a spray head, wherein the liquid nitrogen transmission line transmits liquid nitrogen in the liquid nitrogen container to the spray head so as to spray the cutting line and the rock for cooling. Through this embodiment, can make rock keep freezing conformal state in the cutting process, be favorable to acquireing complete rock specimen.

In one embodiment of the first aspect, the thermal insulation casing is arranged outside the rock fastening assembly, the thermal insulation casing is made of a thermal insulation material, and the thermal insulation casing is provided with a reserved hole for partially accommodating the liquid nitrogen transmission pipeline. Through this embodiment, the heat preservation shell is favorable to making rock keep freezing shape-preserving state in the cutting process, is favorable to acquireing complete rock specimen.

In one embodiment of the first aspect, the thermal enclosure comprises a removable top plate for access of the rock securing assembly to and from the thermal enclosure. Through this embodiment, be favorable to avoiding dismantling the lagging casing frequently, facilitate for the fixed subassembly business turn over lagging casing of rock simultaneously.

In a second aspect, the present invention further provides a cutting method of the wire-electrode cutting device for producing a rock sample by using a freezing and shape-retaining technique according to the first aspect or any one of the embodiments thereof, the cutting method including the steps of: and starting the linear cutting device, setting a moving track of the sample moving system, and cutting the rock, wherein the moving track comprises the periphery of the section of the required columnar rock sample. By utilizing the cutting method, the loose sandstone standard columnar rock sample can be cut by adopting a freezing shape-preserving technology, the freezing shape-preserving technology is favorable for taking out a complete rock core, the contact surface between the cutting line and the rock core is small, the generated rock debris is directly taken out and cannot be accumulated, the columnar rock sample is not damaged, and the sampling success rate is greatly improved. Due to the fact that the success rate of taking the columnar rock sample is improved, the method has positive effects and practical significance for researching physical properties of the unconsolidated sandstone core, correctly knowing objective rules of an oil reservoir, guiding development and production of the oil reservoir and improving resource utilization degree.

In one embodiment of the second aspect, the movement trajectory may be circularly rotated along the outer circumference for 2-3 weeks to repeat the cutting for 2-3 weeks, thereby separating the rock sample from the rock body. Through this embodiment, be favorable to guaranteeing rock specimen and rock mass smooth separation.

In one embodiment of the second aspect, the cutting method further comprises a preliminary step before cutting, the preliminary step comprising: the rock was soaked in liquid nitrogen for 10-20 minutes to ensure the rock was frozen. Through this embodiment, be favorable to guaranteeing that rock is in freezing conformal state in the cutting process, be favorable to acquireing complete rock specimen.

In one embodiment of the second aspect, the preparing step further comprises: and cutting the heat-insulating material to avoid the arrangement of the cutting area. Through this embodiment, be favorable to exempting from the cutting line and the insulation material contact to avoid insulation material to produce the piece, influence the cutting operation.

In one embodiment of the second aspect, the preparing step further comprises: opening a top plate of the heat preservation shell, and putting a rock fixing component clamping rock; adjusting the objective table to enable the rock end face to be in the pre-cutting position; adjusting the spray head to align the spray head with the rock and the cutting line; and closing the top plate of the heat-insulating shell to seal the rock in the heat-insulating shell. Through this embodiment, be favorable to guaranteeing the cutting in-process, the heat preservation shell plays the heat preservation effect to the rock to make the rock be in freezing conformal state.

In one embodiment of the second aspect, the cutting method comprises the steps of sealing the taken rock sample with a metal sleeve after cutting, and freezing and storing the rock sample in an ultra-low temperature freezer. Through the embodiment, the obtained rock sample is favorably stored in a frozen shape-preserving state for subsequent experiment needs.

Compared with the prior art, the linear cutting device and the cutting method for manufacturing the rock sample by using the freezing shape-preserving technology have the following beneficial effects.

1. The linear cutting device provided by the invention can cut loose sandstone standard columnar rock samples by utilizing a freezing shape-preserving technology, the freezing shape-preserving technology is favorable for taking out complete rock samples, the contact surface between the cutting line and rocks is small, the generated rock debris is directly taken out without accumulation, the columnar rock samples are not damaged, and the sampling success rate is greatly improved. Due to the fact that the success rate of taking the columnar rock sample is improved, the method has positive effects and practical significance for researching physical properties of the unconsolidated sandstone core, correctly knowing objective rules of an oil reservoir, guiding development and production of the oil reservoir and improving resource utilization degree.

2. The cutting line can be prevented from falling off, and the cutting line can be neatly wound or orderly drawn out.

3. The tensioning wheel can tension the cutting line, thereby avoiding the occurrence of line disconnection and line breakage.

4. The blotter is used for preventing the rock specimen that obtains from dropping, can also prevent that the foreign matter from getting into the wire-electrode cutting device, is favorable to wire-electrode cutting device's normal operating, improves the sample success rate and improves wire-electrode cutting device's life.

5. The sample moving system is beneficial to accurately controlling the moving speed of the longitudinal moving table and the transverse moving table and the coordinate of the object stage in the cutting process.

6. The refrigeration and heat preservation system can keep the rock in a frozen shape-preserving state in the cutting process, and is favorable for obtaining a complete rock sample.

The features mentioned above can be combined in various suitable ways or replaced by equivalent features as long as the object of the invention is achieved.

Drawings

The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings, in which:

fig. 1 shows a schematic front view of a wire cutting apparatus according to an embodiment of the present invention;

fig. 2 shows a schematic structural diagram of a vertical mobile station according to an embodiment of the present invention;

FIG. 3 shows a schematic bottom view of a wire cutting apparatus according to an embodiment of the present invention;

FIG. 4 shows a schematic top view of an upper support drive according to an embodiment of the present invention;

FIG. 5 shows a schematic perspective view of a rock fastening assembly according to an embodiment of the invention;

fig. 6 shows a schematic diagram of a cutting trajectory of rock according to an embodiment of the invention.

List of reference numerals:

1-a lower housing; 2-a pillar; 3-an upper housing; 4-a lower reel; 5-a lower motor; 6-a cutting line; 7-a tension wheel; 8-lower guide wheels; 9-upper guide wheels; 10-an upper reel; 11-an upper motor; 12-rock; 13-a rock fixation assembly; 14-a heat preservation shell; 15-liquid nitrogen container; 16-a cushion pad; 17-an object stage; 18-a transverse motor; 19-a longitudinal motor; 20-a lateral mobile station; 21-a vertical mobile station; 22-a base; 23-thermal insulation material; 24-a rock fixation base; 25-a slide; 26-a position adjustment assembly; 27-a first fixed slide; 28-cutting track; 29-a second fixed slider; 30-moving the upper set of idlers; 31-a middle upper idler set; 32-moving the lower idler set; 33-middle lower idler set; 34-longitudinal slide block; 35-longitudinal guide rails; 36-lead screw.

In the drawings, like parts are provided with like reference numerals. The drawings are not to scale.

Detailed Description

The invention will be further explained with reference to the drawings.

As shown in fig. 1 to 4, the present embodiment provides a wire-electrode cutting apparatus for producing a rock sample by using a freezing and shape-retaining technique, the wire-electrode cutting apparatus including: a base 22; the linear cutting system is fixed on the base 22 and comprises a cutting line 6, and the cutting line 6 cuts the rock 12 through vertical motion to obtain a rock sample; a sample movement system, secured to the base 22, for moving the rock 12 laterally and longitudinally during cutting so that the rock 12 is cut by the cutting wire 6; the refrigeration and heat preservation system comprises a refrigeration assembly and a heat preservation assembly, wherein the refrigeration assembly can spray a refrigerant to the cutting line 6 and the surface of the rock 12 to reduce the temperature; the insulation assembly includes an insulation housing 14 for placing the rock 12 in a frozen conformal condition.

During cutting, the cutting line 6 remains stationary in the longitudinal and transverse directions, and it moves only at a high speed in the vertical direction to perform the cutting. In order for the cutting line 6 to form a cutting trajectory 28 as shown in fig. 6, the sample movement system moves the rock 12 laterally and longitudinally during the cutting process. The refrigeration and heat preservation system comprises a refrigeration component and a heat preservation component, wherein the refrigeration component can spray a refrigerant to the surfaces of the cutting line 6 and the rock 12 so as to reduce the temperature; the insulating assembly includes an insulating housing 14 for holding the rock 12 in a frozen conformal condition, preferably with a cryogen being liquid nitrogen.

Preferably, the rock sample is a standard columnar rock sample which can be used for various development investigations and geological experiments, in particular for displacement experiments. The actual situation of a unconsolidated sandstone reservoir can be more accurately reflected by a displacement experiment, so that the displacement experiment needs to be carried out by taking a standard columnar rock sample.

The refrigerating and heat-insulating system makes the whole cutting process be carried out under the condition of freezing and shape-preserving. The loose sandstone is difficult to form under the normal temperature condition, and the traditional method for drilling the columnar rock sample at the normal temperature is very easy to damage the rock sample, so that the freezing shape-preserving technology is applied to obtain the complete rock sample.

Cutting with the cutting line 6 can avoid the use of a drill bit, thereby avoiding the generation of a large amount of oil-bearing rock debris. If use the drill bit to cut under freezing conformal condition, because the carrying capacity of liquid nitrogen and cryogenic fluid is relatively poor, and the detritus under the low temperature condition is great with oil, water mixture viscosity together, is difficult for dashing out the detritus from the drill bit, causes the drill bit to block up easily, has increased the drill bit resistance, and the resistance of increase produces torsion on acting on the rock core post. When the core bit is operated at high speeds, the torsional forces acting on the core string cause the frozen loose sandstone sample to be very easily twisted off or chipped, resulting in a failed coring operation. Through using the line of cut 6, the line of cut 6 is little with the contact surface of rock 12, and the detritus of production directly takes out, can not pile up, does not have the destruction effect to cylindric rock sample, has increased substantially the sample success rate.

This wire cutting device utilizes freezing shape preserving technique to surely get loose sandstone standard columnar rock specimen, and freezing shape preserving technique is favorable to taking out complete rock specimen, and the contact surface of line of cut 6 and rock 12 is little, and the detritus of production is directly taken out, can not pile up, does not have the devastation to columnar rock specimen, has increased substantially the sample success rate. Due to the fact that the success rate of taking the columnar rock sample is improved, the method has positive effects and practical significance for researching physical properties of the unconsolidated sandstone core, correctly knowing objective rules of an oil reservoir, guiding development and production of the oil reservoir and improving resource utilization degree.

In one embodiment, the wire cutting system further comprises: an upper supporting driving part, as shown in fig. 4, including an upper housing 3, and an upper reel 10 and an upper guide wheel 9 provided in the upper housing 3, a first end of the cutting wire 6 being wound around the upper reel 10, the cutting wire 6 being in contact with the upper guide wheel 9, one end of the upper reel 10 being connected to an upper motor 11 for driving the upper reel 10 to rotate so as to drive the cutting wire 6 to move vertically; a lower support driving part, as shown in fig. 3, including a lower housing 1, and a lower reel 4 and a lower guide wheel 8 disposed in the lower housing 1, wherein a second end of the cutting wire 6 is wound on the lower reel 4, the cutting wire 6 is in contact with the lower guide wheel 8, and one end of the lower reel 4 is connected to a lower motor 5 to drive the lower reel 4 to rotate so as to drive the cutting wire 6 to move vertically; and a support column 2 provided between the upper case 3 and the lower case 1 for adjusting the height of the upper support driving part.

The first end of the cutting wire 6 is wound on the upper reel 10, the second end of the cutting wire 6 is wound on the lower reel 4, and the upper reel 10 and the lower reel 4 can be driven to rotate by the upper motor 11 and the lower motor 5, so that the cutting wire 6 is driven to move.

The upper guide wheel 9 and the lower guide wheel 8 keep the cutting line 6 in a stationary state in the transverse and longitudinal directions and keep the movement direction of the cutting line 6 in a vertical direction.

The output shaft of the upper motor 11 is fixedly connected with the central shaft of the upper reel 10, so that the upper motor 11 is driven, the upper reel 10 rotates, and the cutting line 6 is driven to vertically move. Similarly, the output shaft of the lower motor 5 is fixedly connected to the central shaft of the lower reel 4, so that driving the lower motor 5, the lower reel 4 rotates and in turn drives the cutting line 6 to move vertically. The upper motor 11 and the lower motor 5 move synchronously, so that the occurrence of wire breakage and wire falling is avoided.

As shown in fig. 1 and 2, the mast 2 can be used to adjust the height of the upper support drive to accommodate cutting of rocks 12 of different heights.

This embodiment ensures that the cutting line 6 cuts only in a vertical movement and that the height of the upper support drive can be adjusted by means of the pillar 2 to adapt to the cutting of rocks 12 of different heights.

In one embodiment, the wire cutting system further comprises: an upper positioning pulley assembly comprising an upper gear connected to the upper motor 11, a moving upper set of idlers 30 and a middle upper set of idlers 31, the upper gear being capable of driving the moving upper set of idlers 30 to move laterally under the drive of the upper motor 11 to control, adjust the lateral position of the cutting line 6 to wind or pull the upper reel 10; the middle upper idler pulley group 31 is fixed in the transverse middle of the upper shell 3; the cutting line 6 is sandwiched between the two idlers of the moving upper idler group 30 and the two idlers of the middle upper idler group 31; and a lower positioning pulley assembly comprising a lower gear connected to the lower motor 5, a movable lower idle pulley set 32 and a middle lower idle pulley set 33, the lower gear being capable of driving the movable lower idle pulley set 32 to move laterally under the driving of the lower motor 5 to control and adjust the lateral position of the cutting line 6 to wind or pull the lower reel 4; the middle lower idler pulley group 33 is fixed at the transverse middle part of the lower shell 1; the cutting line 6 is sandwiched between the two idlers of the moving lower set of idlers 32 and the two idlers of the intermediate lower set of idlers 33.

As shown in fig. 4, the moving upper set of idlers 30 includes two idlers, and the intermediate upper set of idlers 31 also includes two idlers, and the cutting line 6, after going out from the upper reel 10, passes first between the two idlers of the moving upper set of idlers 30, and then between the two idlers of the intermediate upper set of idlers 31, to reach the upper guide pulley 9. The two idler wheels of the upper idler wheel group 30 are moved to clamp the cutting line 6 between the two idler wheels for limiting, so that the cutting line 6 is prevented from being separated; likewise, the two idlers of the group 31 of idler-wheels on the middle sandwich the cutting line 6 between them to limit the same and avoid the cutting line 6 from coming off.

The upper gear is capable of moving the upper idler set 30 laterally under the drive of the upper motor 11 to control, adjust the lateral position at which the cutting string 6 is wound on or drawn out of the upper reel 10, so that the cutting string 6 is wound neatly on the upper reel 10 or is drawn out orderly from the upper reel 10.

As shown in FIG. 3, the moving lower set of idler pulleys 32 includes two idler pulleys, and the intermediate lower set of idler pulleys 33 also includes two idler pulleys, and the cutting line 6, after it has been unwound from the lower reel 4, passes between the two idler pulleys of the moving lower set of idler pulleys 32, then between the two idler pulleys of the intermediate lower set of idler pulleys 33, to the lower guide pulley 8. The two idler wheels of the lower idler wheel group 32 are moved to clamp the cutting line 6 between the two idler wheels for limiting, so that the cutting line 6 is prevented from being separated; likewise, the two idler wheels of the lower middle idler wheel group 33 sandwich the cutting line 6 between them to limit the position thereof, avoiding the detachment of the cutting line 6.

The lower gear is capable of moving the lower idler set 32 laterally under the drive of the lower motor 5 to control, adjust the lateral position at which the cutting string 6 is wound on or drawn out of the lower reel 4, so that the cutting string 6 is wound on the lower reel 4 neatly or drawn out of the lower reel 4 orderly.

This embodiment is advantageous in that the separation of the cutting line 6 is avoided and the cutting line 6 is wound neatly or drawn out orderly.

In one embodiment, as shown in fig. 4, the middle of the upper guide wheel 9 is formed with a stopper groove; as shown in fig. 3, the lower guide wheel 8 is formed at its middle portion with a stopper groove for receiving the cutting line 6.

In the embodiment, the limiting grooves are formed in the middle parts of the upper guide wheel 9 and the lower guide wheel 8, so that the cutting line 6 is ensured to bypass from the middle part of the guide wheels, and the cutting line 6 can be prevented from being separated.

In one embodiment, the wire cutting system further comprises a wire cutting control assembly for controlling the speed of the wire travel of the cutting wire 6, which is communicatively connected to the upper motor 11 and the lower motor 5.

The cutting control assembly of the embodiment coordinates the rotating speeds of the upper motor 11 and the lower motor 5, and ensures that the upper motor 11 and the lower motor 5 synchronously move, thereby avoiding the occurrence of wire breakage and wire disconnection.

Preferably, the upper motor 11 and the lower motor 5 are both servo motors to achieve precise positioning.

In one embodiment, optionally, as shown in fig. 1-3, the wire cutting system further comprises a tensioner 7 assembly, the tensioner 7 assembly comprising a tensioner 7, a drive link, and a tension adjustment device, the tension adjustment device having a spring that is adjustable by the drive link to move the tensioner 7 to tension the cutting wire 6 in contact with the tensioner 7.

Preferably, the tensioner 7 assembly is provided in the lower support drive to facilitate adjustment.

This embodiment can tension the cutting line 6 in contact with the tension pulley 7, thereby avoiding the occurrence of wire disconnection and wire jumping.

Optionally, an electric steering engine can be used for replacing the tensioning wheel 7 assembly, and the purpose of tensioning the cutting line 6 is also achieved, so that the line is prevented from being disconnected and jumped.

In one embodiment, as shown in fig. 1 and 2, the wire cutting system further comprises a cushion 16, cushioned below the rock 12, for preventing the captured rock sample from falling and also for preventing foreign objects from entering the wire cutting apparatus.

The cushion 16 is located below the rock 12, above the lower housing 1, for preventing the falling of the cut rock sample, and also for preventing foreign matter from entering the wire cutting device, which affects the normal operation of the wire cutting device, wherein the foreign matter is mainly sand and oil carried on the cutting wire 6.

This embodiment is favorable to wire cutting device's normal operating, improves the success rate of taking a sample and improves wire cutting device's life.

In one embodiment of the first aspect, the cutting wire 6 is a diamond wire, which is a steel wire having diamond bonded to the surface thereof by plating metal.

The coating of the diamond-sand wire and the steel wire are metallurgically bonded, the consolidation strength is high, and the diamond is not easy to fall off in the cutting process, and the wire breakage and scratch are not easy to cause.

This embodiment is favorable to improving the life of line 6, and is difficult for causing the broken string and fish tail.

In one embodiment, as shown in fig. 1 and 2, the sample moving system includes a longitudinal moving stage 21, a transverse moving stage 20 and an object stage 17 stacked in a vertical direction, the longitudinal moving stage 21 can move longitudinally relative to a base 22, the transverse moving stage 20 can move transversely relative to the longitudinal moving stage 21 and is stationary relative to the longitudinal moving stage 21 in the longitudinal direction, and the object stage 17 can be stationary relative to the transverse moving stage 20 during the cutting process, so that the object stage 17 can move longitudinally and transversely during the cutting process to drive the rock 12 fixed on the object stage 17 to move longitudinally and transversely.

The longitudinal movement of the stage 17 is controlled by a longitudinal movement stage 21, and the lateral movement of the stage 17 is controlled by a lateral movement stage 20. By moving the longitudinal moving stage 21 and the transverse moving stage 20, the stage 17 can move the rock 12 fixed on the stage 17 longitudinally and transversely, and a cutting track 28 is formed on the rock 12, so that the rock 12 is cut by the cutting line 6.

As shown in fig. 1 and 5, the central axis of the rock 12 is disposed longitudinally. Fig. 6 is a vertical plan view. Figure 6 shows a cutting trajectory 28 of the cutting line 6 on the rock 12. The cutting trajectory 28 includes the peripheral circle of the desired columnar rock sample cross-section to obtain a standard cylindrical rock sample.

In the present embodiment, by moving the longitudinal moving stage 21 and the transverse moving stage 20, the stage 17 can drive the rock 12 fixed on the stage 17 to move longitudinally and transversely, and a cutting track 28 is formed on the rock 12, so that the rock 12 is cut by the cutting line 6, thereby obtaining a standard columnar rock sample.

In one embodiment, the base 22 is provided with a longitudinal guide rail 35, a longitudinal sliding block 34 is fixed below the longitudinal moving platform 21, a nut is fixed inside the longitudinal sliding block 34, a lead screw 36 is connected between the longitudinal motor 19 and the nut, and the longitudinal motor 19 drives the lead screw 36 to rotate so that the nut and the longitudinal sliding block 34 slide along the longitudinal guide rail 35 to drive the longitudinal moving platform 21 to longitudinally slide; the longitudinal moving platform 21 is provided with a transverse guide rail, a transverse sliding block is fixed below the transverse moving platform 20, a nut is fixed in the transverse sliding block, a screw rod 36 is connected between the transverse motor 18 and the nut, and the transverse motor 18 drives the screw rod 36 to rotate so that the nut and the transverse sliding block slide along the transverse guide rail to drive the transverse moving platform 20 to transversely slide.

As shown in fig. 2, the longitudinal slide block 34 can slide longitudinally relative to the longitudinal guide rail 35 to drive the longitudinal moving table 21 to slide along the longitudinal guide rail 35, and the longitudinal motor 19 drives the longitudinal slide block 34 to slide through the screw 36 and the nut structure. The screw 36 and the nut are used as a driving structure, which is beneficial to accurately controlling the moving speed of the longitudinal moving table 21. In order to further accurately control the moving speed of the vertical movement stage 21, it is preferable that the vertical motor 19 is a servo motor.

Similarly, the transverse slide block can slide transversely relative to the transverse guide rail so as to drive the transverse moving table 20 to slide along the transverse guide rail, and the transverse motor 18 drives the transverse slide block to slide through the screw rod 36 and the nut structure. The screw 36 and the nut are used as a driving structure, which is beneficial to accurately controlling the moving speed of the transverse moving table 20. In order to further accurately control the moving speed of the traverse table 20, it is preferable that the traverse motor 18 is a servo motor.

This embodiment is advantageous for accurately controlling the moving speeds of the vertical moving stage 21 and the horizontal moving stage 20.

In one embodiment, the sample movement system further comprises a movement control assembly communicatively coupled to the longitudinal motor 19 and the transverse motor 18 to control the coordinate position of the stage 17 during the cutting process.

The movement control assembly controls the rotating speed of the longitudinal motor 19 and the transverse motor 18, so that the transverse coordinate position and the longitudinal coordinate position of the object stage 17 are accurately controlled in the cutting process, and the transverse coordinate position and the longitudinal coordinate position of the object stage 17 are controlled because the object stage 17 is kept static in the vertical direction in the cutting process, so that the spatial coordinate position of the object stage 17 is controlled.

The movement control assembly of the present embodiment controls the rotation speed of the longitudinal motor 19 and the transverse motor 18, thereby accurately controlling the coordinate position of the stage 17 during the cutting process.

In one embodiment, the sample moving system further comprises a rock securing assembly 13, as shown in fig. 5, the rock securing assembly 13 comprising: a rock fixation mount 2422 that can be secured to stage 17; a slide 25 opening on the top surface of the rock fixation pedestal 2422; a first fixed slider 27, which can slide along the slide 25; a second fixed slider 29, which can slide along the slide 25; and a position adjusting assembly 26 for adjusting the distance between the first fixed slide 27 and the second fixed slide 29 to clamp or release the rock 12 wrapped inside the thermal insulation material 23; during the cutting process, the insulation material 23 is set up avoiding the cutting zone.

As shown in fig. 1 and 5, the rock fastening assembly 13 is arranged longitudinally and one end of the rock fastening base 2422 in the longitudinal direction is fixed to the stage 17. To improve stability, the fixture preferably includes multiple rows of threaded rods so that stage 17 provides more secure support for rock fastening base 2422.

The first fixed slide 27 and the second fixed slide 29 are both slidable along the slide 25. By means of the position adjustment assembly 26, the distance between the first fixed slide 27 and the second fixed slide 29 can be adjusted to clamp or release the rock 12 wrapped inside the insulation 23. Optionally, the position adjustment assembly 26 includes a jackscrew.

The insulating material 23 facilitates the rock 12 in a frozen conformal state.

In the cutting process, as shown in fig. 6, the heat insulating material 23 is arranged to avoid the cutting area, so that the cutting line 6 can be prevented from contacting with the heat insulating material 23, and the heat insulating material 23 is prevented from generating chips to influence the cutting operation.

The present embodiment clamps or releases the rock 12 wrapped inside the thermal insulation material 23 by adjusting the distance between the first stationary slider 27 and the second stationary slider 29.

In one embodiment, the refrigeration component of the refrigeration and insulation system comprises a liquid nitrogen container 15 and a liquid nitrogen delivery line and a spray head, wherein the liquid nitrogen delivery line delivers liquid nitrogen in the liquid nitrogen container 15 to the spray head to spray and cool the cutting line 6 and the rock 12.

The liquid nitrogen as a common refrigerant has the advantages of economical price, easy acquisition, easy storage and the like. Therefore, the refrigerant of the present embodiment is liquid nitrogen.

The liquid nitrogen container 15 is provided with a valve, the valve is opened, the spray head sprays liquid nitrogen, the valve is closed, and the spray head stops spraying the liquid nitrogen.

The liquid nitrogen can keep the rock 12 in a frozen shape-preserving state in the cutting process, and is beneficial to obtaining a complete rock sample.

The embodiment can keep the rock 12 in a frozen shape-preserving state in the cutting process, and is beneficial to obtaining a complete rock sample.

In one embodiment, the insulated shell 14 is disposed outside the rock securing assembly 13, the insulated shell 14 is made of a thermally insulating material, and the insulated shell 14 is provided with a pre-determined hole for partially receiving the liquid nitrogen delivery line.

The thermal insulation shell 14 of the embodiment is beneficial to keeping the rock 12 in a frozen and shape-preserving state in the cutting process, and is beneficial to obtaining a complete rock sample.

In one embodiment, the insulated housing 14 includes a removable top plate for the rock securing assembly 13 to enter and exit the insulated housing 14.

The thermal insulation shell 14 is fixed between the upper shell 3 and the lower shell 1 of the linear cutting device, so that the thermal insulation shell 14 is prevented from being frequently detached in order to facilitate the access of the rocks 12, and the detachable top plate is arranged on the thermal insulation shell 14, thereby being beneficial to the rock fixing component 13 to enter and exit the thermal insulation shell 14.

This embodiment is advantageous in avoiding frequent disassembly of the thermal shell 14 while facilitating access of the rock securing assembly 13 to and from the thermal shell 14.

The embodiment also provides a cutting method of the linear cutting device for manufacturing the rock sample by using the freezing shape-preserving technology, which comprises the following steps: and starting the linear cutting system, setting the movement track of the sample moving system, and cutting the rock 12, wherein the movement track comprises the peripheral circle of the section of the required columnar rock sample.

The starting linear cutting device comprises a starting linear cutting system, a sample moving system and a refrigeration and heat preservation system. The wire cutting system is started, and the cutting wire 6 is started to move in the vertical direction to cut. Actuating the sample movement system includes actuating the traverse motor 18 and the longitudinal motor 19 to move the stage 17 laterally and longitudinally. Activating the cold-thermal insulation system involves spraying a cryogen with a spray head onto the surface of the cutting wire 6 and rock 12 to reduce the temperature.

This embodiment can adopt freezing shape-preserving technique to surely get loose sandstone standard columnar rock specimen, and freezing shape-preserving technique is favorable to taking out complete rock core, and the contact surface of line of cut 6 and rock core is little, and the detritus that produces is directly taken out, can not pile up, does not have the devastating action to columnar rock specimen, has increased substantially the sample success rate. Due to the fact that the success rate of taking the columnar rock sample is improved, the method has positive effects and practical significance for researching physical properties of the unconsolidated sandstone core, correctly knowing objective rules of an oil reservoir, guiding development and production of the oil reservoir and improving resource utilization degree.

In one embodiment, the movement track can be circularly rotated for 2-3 weeks along the outer circumference to repeatedly cut for 2-3 weeks, thereby separating the rock sample from the rock body.

This embodiment is favorable to guaranteeing rock specimen and rock mass smooth separation.

In one embodiment, the cutting method further comprises a preliminary step before cutting, the preliminary step comprising: the rock 12 is soaked in liquid nitrogen for 10-20 minutes to ensure that the rock 12 freezes.

The embodiment is beneficial to ensuring that the rock 12 is in a frozen shape-preserving state in the cutting process and is beneficial to obtaining a complete rock sample.

In one embodiment, the preparing step further comprises: the insulating material 23 is cut so as to be set avoiding the cutting area.

This embodiment is favorable to exempting from cutting line 6 and insulation material 23 to contact to avoid insulation material 23 to produce the piece, influence the cutting operation.

In one embodiment, the preparing step further comprises: opening the top plate of the heat preservation shell 14, and placing the rock fixing component 13 clamping the rock 12; adjusting the stage 17 to bring the end face of the rock 12 into its pre-cutting position; adjusting the spray head to be directed at the rock 12 and the cutting line 6; and closing the top panel of the insulated housing 14 to enclose the rock 12 within the insulated housing 14.

This embodiment is advantageous to ensure that the insulating casing 14 can insulate the rock 12 during the cutting process, thereby keeping the rock 12 in a frozen shape-retaining state.

In one embodiment, the cutting method comprises the steps of sealing the taken rock sample with a metal sleeve after cutting, and placing the rock sample into an ultra-low temperature freezer for freezing and storing.

The embodiment is beneficial to the preservation of the obtained rock sample in a frozen shape-preserving state for subsequent experiment needs.

Example one

And starting the wire cutting device to cut. The starting linear cutting device comprises a starting linear cutting system, a sample moving system and a refrigeration and heat preservation system. The wire cutting system is started, and the cutting wire 6 is started to move vertically to cut. Actuating the sample movement system includes actuating the traverse motor 18 and the longitudinal motor 19 to move the stage 17 laterally and longitudinally. Activating the cold-thermal insulation system involves spraying a cryogen with a spray head onto the surface of the cutting wire 6 and rock 12 to reduce the temperature.

During cutting, the cutting line 6 moves vertically, and the stage 17 moves along with the longitudinal moving stage 21 and the transverse moving stage 20, so as to change the abscissa and ordinate of the rock 12 to form a cutting track 28 as shown in fig. 6. The cutting trajectory 28 may be circularly rotated for 2-3 weeks along the outer circumference of the desired columnar rock sample cross-section to repeat the cutting for 2-3 weeks, thereby separating the rock sample from the rock mass.

The refrigeration and heat preservation system comprises a spray head for spraying a refrigerant to the cutting line 6 and the surface of the rock 12 to reduce the temperature, and meanwhile, the rock 12 is wrapped by the heat preservation shell 14 and the heat preservation material 23 layer by layer so as to ensure that the rock 12 is in a frozen shape-preserving state in the cutting process.

Example two

Installation of the cutting line 6.

One end of the cutting wire 6 is wound on the upper reel 10, passes through the upper idler set 30, the upper idler set 31, and reaches the upper guide wheel 9, and then the cutting wire 6 is vertically wound downward through the lower guide wheel 8, the lower idler set 33, and the lower idler set 32 onto the lower reel 4.

The first end of the cutting line 6 is wound on the upper reel 10, the second end of the cutting line 6 is wound on the lower reel 4, and the upper reel 10 and the lower reel 4 can be driven to rotate by the upper motor 11 and the lower motor 5, so that the cutting line 6 is driven to move.

The output shaft of the upper motor 11 is fixedly connected to the central shaft of the upper reel 10, so that the upper motor 11 is driven, the upper reel 10 rotates, and the cutting line 6 is driven to move vertically. Similarly, the output shaft of the lower motor 5 is fixedly connected to the central shaft of the lower reel 4, so that driving the lower motor 5, the lower reel 4 rotates and in turn drives the cutting line 6 to move vertically. The upper motor 11 and the lower motor 5 move synchronously, so that the occurrence of wire breakage and wire falling is avoided.

The moving upper set of idler wheels 30 comprises two idler wheels and the intermediate set of idler wheels 31 also comprises two idler wheels, the cutting line 6 passing between the two idler wheels of the moving upper set of idler wheels 30, then between the two idler wheels of the intermediate set of idler wheels 31, to the upper guide wheel 9 after having been wound from the upper reel 10. The two idler wheels of the upper idler wheel group 30 are moved to clamp the cutting line 6 between the two idler wheels for limiting, so that the cutting line 6 is prevented from being separated; likewise, the two idlers of the group 31 of idler-wheels on the middle sandwich the cutting line 6 between them to limit the same and avoid the cutting line 6 from coming off.

The upper gear is capable of moving the upper idler gear set 30 laterally under the drive of the upper motor 11 to control, adjust the lateral position at which the cutting string 6 is wound on or drawn out of the upper reel 10, so that the cutting string 6 is wound on or drawn out of the upper reel 10 in order.

The moving lower set of idler wheels 32 comprises two idler wheels and the intermediate lower set of idler wheels 33 also comprises two idler wheels, the cutting line 6 passing between the two idler wheels of the moving lower set of idler wheels 32, then between the two idler wheels of the intermediate lower set of idler wheels 33, after having been wound off the lower reel 4, to the lower guide wheel 8. The two idler wheels of the lower idler wheel group 32 are moved to clamp the cutting line 6 between the two idler wheels for limiting, so that the cutting line 6 is prevented from being separated; likewise, the two idle wheels of the lower middle idle wheel group 33 clamp the cutting line 6 therebetween to limit the position, avoiding the detachment of the cutting line 6.

EXAMPLE III

During cutting, the sample movement system controls the coordinate position of the rock 12 to form a cutting trajectory 28 to complete the cutting operation.

A longitudinal guide rail 35 is arranged on the base 22, a longitudinal sliding block 34 is fixed below the longitudinal moving platform 21, a nut is fixed inside the longitudinal sliding block 34, a lead screw 36 is connected between a longitudinal motor 19 and the nut, and the longitudinal motor 19 drives the lead screw 36 to rotate so that the nut and the longitudinal sliding block 34 slide along the longitudinal guide rail 35 to drive the longitudinal moving platform 21 to longitudinally slide; the longitudinal moving platform 21 is provided with a transverse guide rail, a transverse sliding block is fixed below the transverse moving platform 20, a nut is fixed in the transverse sliding block, a screw rod 36 is connected between the transverse motor 18 and the nut, and the transverse motor 18 drives the screw rod 36 to rotate so that the nut and the transverse sliding block slide along the transverse guide rail to drive the transverse moving platform 20 to transversely slide.

The longitudinal sliding block 34 can slide longitudinally relative to the longitudinal guide rail 35 so as to drive the longitudinal moving table 21 to slide along the longitudinal guide rail 35, and the longitudinal motor 19 drives the longitudinal sliding block 34 to slide through the screw rod 36 and the nut structure. The screw 36 and the nut are used as a driving structure, which is beneficial to accurately controlling the moving speed of the longitudinal moving table 21. In order to further accurately control the moving speed of the longitudinal moving stage 21, it is preferable that the longitudinal motor 19 is a servo motor.

Similarly, the transverse sliding block can slide transversely relative to the transverse guide rail so as to drive the transverse moving table 20 to slide along the transverse guide rail, and the transverse motor 18 drives the transverse sliding block to slide through the screw rod 36 and the nut structure. The screw 36 and the nut are used as a driving structure, which is beneficial to accurately controlling the moving speed of the transverse moving table 20. In order to further accurately control the moving speed of the traverse table 20, it is preferable that the traverse motor 18 is a servo motor.

Example four

The preliminary steps before cutting include: soaking the rock 12 in liquid nitrogen for 10-20 minutes to ensure that the rock 12 is frozen; cutting the heat-insulating material 23 to avoid the arrangement of a cutting area; opening the top plate of the thermal insulation shell 14, and placing the rock fixing component 13 clamping the rock 12; adjusting the stage 17 to bring the end face of the rock 12 into its pre-cutting position; adjusting the spray head to be directed at the rock 12 and the cutting line 6; and closing the top plate of the insulated shell 14 to enclose the rock 12 in the insulated shell 14, thereby ensuring that the rock 12 is in a frozen conformal state during the cutting process.

EXAMPLE five

After the cutting operation is completed, the valve of the refrigerant container is closed, the top plate of the thermal insulation shell 14 is opened, the rock 12 is taken out, and the cut columnar rock sample is taken out. If the columnar rock sample does not fall on the cushion pad 16, the columnar rock sample can be ejected by using a pseudocore; if the columnar rock sample is not jacked, the rock 12 around the columnar rock sample can be cut off by a cutter until the columnar rock sample can be taken out. And (4) after the rock sample is taken out, the taken rock sample is packaged by a metal sleeve and then is put into an ultralow temperature freezer for freezing and storing.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inner", "outer", "left", "right", and the like, are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.

Claims

1. A wire cutting device for manufacturing a rock sample by utilizing a freezing shape-preserving technology is characterized by comprising:

a base;

the linear cutting system is fixed on the base and comprises a cutting line, and the cutting line cuts rocks through vertical motion to obtain a rock sample;

a sample moving system fixed on the base for moving the rock transversely and longitudinally during cutting so that the rock is cut by the cutting line; and the number of the first and second groups,

the refrigeration and heat preservation system comprises a refrigeration component and a heat preservation component, wherein the refrigeration component can spray a refrigerant to the cutting line and the rock surface to reduce the temperature; the heat preservation assembly comprises a heat preservation shell used for placing the rock under the freezing shape-preserving condition.

2. The wire-electrode cutting device for making rock samples by using freezing conformal technology according to claim 1, wherein the wire-electrode cutting system further comprises:

the upper support driving part comprises an upper shell, an upper reel and an upper guide wheel, wherein the upper reel and the upper guide wheel are arranged in the upper shell, a first end of the cutting line is wound on the upper reel, the cutting line is in contact with the upper guide wheel, and one end of the upper reel is connected with an upper motor to drive the upper reel to rotate so as to drive the cutting line to vertically move;

the lower support driving part comprises a lower shell, a lower reel and a lower guide wheel, wherein the lower reel and the lower guide wheel are arranged in the lower shell, the second end of the cutting line is wound on the lower reel, the cutting line is in contact with the lower guide wheel, and one end of the lower reel is connected with a lower motor to drive the lower reel to rotate so as to drive the cutting line to vertically move; and (c) a second step of,

and a strut provided between the upper housing and the lower housing for adjusting a height of the upper support driving part.

3. The wire-electrode cutting device for making rock samples by using freezing conformal technology according to claim 2, wherein the wire-electrode cutting system further comprises:

an upper positioning pulley assembly which comprises an upper gear connected with the upper motor, a movable upper idle pulley set and a middle upper idle pulley set, wherein the upper gear can drive the movable upper idle pulley set to move transversely under the driving of the upper motor so as to control and adjust the transverse position of the cutting wire for winding or drawing out the upper reel; the middle upper idler group is fixed at the transverse middle part of the upper shell; the cutting line is clamped between the two idler wheels of the movable upper idler wheel set and the two idler wheels of the middle upper idler wheel set; and the number of the first and second groups,

the lower positioning pulley assembly comprises a lower gear connected with the lower motor, a movable lower idle pulley set and a middle lower idle pulley set, and the lower gear can drive the movable lower idle pulley set to move transversely under the driving of the lower motor so as to control and adjust the transverse position of the cutting wire for winding or drawing out the lower reel; the middle lower idler pulley group is fixed in the transverse middle of the lower shell; the cutting line is sandwiched between the two idlers of the moving lower idler set and the two idlers of the middle lower idler set.

4. The wire-electrode cutting device for making a rock sample by using the freezing conformal technology according to claim 2, wherein a limiting groove is formed in the middle of the upper guide wheel; and a limiting groove is formed in the middle of the lower guide wheel and is used for accommodating the cutting line.

5. The wire cutting apparatus for making a rock sample using frozen conformal technology as claimed in claim 2, wherein the wire cutting system further comprises a wire cutting control assembly for controlling a wire traveling speed of a cutting wire, which is communicatively connected to the upper motor and the lower motor.

6. The wire cutting apparatus for making a rock sample using a freezing conformal technique according to claim 1, wherein the wire cutting system further comprises a tension wheel assembly, the tension wheel assembly comprising a tension wheel, a transmission rod, and a tension adjusting means, wherein adjusting an amount of spring expansion of the tension adjusting means through the transmission rod can move the tension wheel to tension the cutting wire in contact with the tension wheel.

7. The wire-electrode cutting device for making rock samples by using the freezing conformal technology as claimed in claim 1, wherein the wire-electrode cutting system further comprises a buffer cushion which is arranged below the rock and used for preventing the obtained rock sample from falling off and preventing foreign matters from entering the wire-electrode cutting device.

8. The wire cutting device for making a rock sample by using a freezing conformal technology according to claim 1, wherein the cutting wire is a diamond wire, and the diamond wire is a steel wire with diamond bonded on the surface by electroplating metal.

9. The apparatus according to claim 1, wherein the sample moving system comprises a longitudinal moving stage, a transverse moving stage and an object stage stacked in a vertical direction, the longitudinal moving stage can move longitudinally relative to the base, the transverse moving stage can move transversely relative to the longitudinal moving stage and is stationary relative to the longitudinal moving stage in a longitudinal direction, the object stage can be stationary relative to the transverse moving stage during cutting, so that the object stage can move longitudinally and transversely during cutting to drive the rock fixed on the object stage to move longitudinally and transversely.

10. The wire-electrode cutting device for making rock samples by utilizing the freezing conformal technology as claimed in claim 9, wherein a longitudinal guide rail is arranged on the base, a longitudinal slide block is fixed below the longitudinal moving platform, a nut is fixed in the longitudinal slide block, a screw rod is connected between a longitudinal motor and the nut, the longitudinal motor drives the screw rod to rotate, so that the nut and the longitudinal slide block slide along the longitudinal guide rail to drive the longitudinal moving platform to slide longitudinally;

the longitudinal moving platform is provided with a transverse guide rail, a transverse sliding block is fixed below the transverse moving platform, a nut is fixed inside the transverse sliding block, a screw rod is connected between a transverse motor and the nut, and the transverse motor drives the screw rod to rotate, so that the nut and the transverse sliding block slide along the transverse guide rail to drive the transverse moving platform to transversely slide.

11. The apparatus of claim 10, wherein the sample moving system further comprises a motion control assembly communicatively coupled to the longitudinal motor and the transverse motor to control the coordinate position of the stage during the cutting process.

12. The wire-cutting apparatus for making a rock sample using cryo-conformal techniques of claim 9, wherein the sample moving system further comprises a rock securing assembly, the rock securing assembly comprising:

a rock securing base securable to the stage;

the slideway is arranged on the top surface of the rock fixing base;

a first fixed slider capable of sliding along the slide;

a second fixed slider capable of sliding along the slide; and the number of the first and second groups,

the position adjusting assembly is used for adjusting the distance between the first fixed sliding block and the second fixed sliding block so as to clamp or release the rock wrapped in the heat insulation material; in the cutting process, the heat insulation material is arranged in a avoiding cutting area.

13. The wire-electrode cutting device for making the rock sample by utilizing the freezing conformal technology according to claim 12, wherein a refrigerating assembly of the refrigerating and heat-preserving system comprises a liquid nitrogen container, a liquid nitrogen transmission pipeline and a spray head, and the liquid nitrogen transmission pipeline transmits liquid nitrogen in the liquid nitrogen container to the spray head so as to spray the cutting wire and the rock for cooling.

14. The wire-electrode cutting device for making rock samples according to the frozen shape-preserving technology of claim 13, wherein the thermal insulation casing is arranged outside the rock fixing component, the thermal insulation casing is made of thermal insulation material, and the thermal insulation casing is provided with a reserved hole for partially accommodating the liquid nitrogen transmission pipeline.

15. The apparatus according to claim 13 or 14, wherein the thermal enclosure comprises a removable top plate for access of the rock fastening assembly to and from the thermal enclosure.

16. A cutting method using the wire cutting apparatus for making a rock sample using the frozen shape-retaining technique according to any one of claims 1 to 15, comprising the steps of:

and starting a linear cutting device, setting a movement track of the sample moving system, and cutting the rock, wherein the movement track comprises the periphery of the section of the required columnar rock sample.

17. A method as claimed in claim 16, wherein the path of travel is circularly around the outer circumference for 2 to 3 cycles to repeat the cut for 2 to 3 cycles to separate the rock sample from the rock mass.

18. The cutting method according to claim 16, further comprising a preliminary step before cutting, the preliminary step comprising: the rock was soaked in liquid nitrogen for 10-20 minutes to ensure the rock was frozen.

19. The cutting method according to claim 18, wherein the preliminary step further comprises: and cutting the heat-insulating material to avoid the arrangement of the cutting area.

20. The cutting method according to claim 18, wherein the preliminary step further comprises:

opening a top plate of the heat preservation shell, and putting a rock fixing component clamping rock;

adjusting the objective table to enable the rock end face to be in the pre-cutting position;

adjusting the spray head to align the spray head with the rock and the cutting line; and the number of the first and second groups,

and closing a top plate of the heat-insulating shell, and sealing the rock in the heat-insulating shell.

21. The cutting method according to claim 16, wherein after the cutting, the removed rock sample is enclosed with a metal sheath and then frozen in an ultra-low temperature freezer.