A geological sample pressure cutting device and cutting method

Abstract

The present invention discloses a geological sample pressure cutting device and cutting method, wherein a cylindrical high-pressure chamber is formed inside the autoclave; one end of the high-pressure chamber is connected to the outside of the autoclave to form a first mounting port, and the other end of the high-pressure chamber is connected to a pressure regulating interface; a second mounting port connected to the outside of the autoclave is radially opened on the side wall of the high-pressure chamber close to the first mounting port; a cutting mechanism is sealed and connected to the second mounting port, and can realize radial feed cutting into the high-pressure chamber; a rotating mechanism is sealed and connected to the first mounting port, and one end thereof extending into the high-pressure chamber is connected to a sample tube, and a sample is built in the sample tube; the rotating mechanism can drive the sample tube to rotate in the high-pressure chamber. The cutting mechanism and the rotating mechanism of the present invention are connected to the autoclave to form a closed high-pressure chamber, so as to realize segmented cutting of geological samples under high pressure; the present invention realizes accurate segmented cutting of geological samples under pressure by designing reliable pressure cutting mechanisms and rotating mechanisms.

Description

Technical Field

[0001] The present invention relates to the technical field of marine exploration technology and equipment, and more specifically to a sample pressure cutting device and method, which is suitable for sample pressure cutting work in natural gas hydrate exploration on land, lakes, rivers, oceans, etc. and other fidelity sampling construction. Background Art

[0002] Natural gas hydrate is widely considered to be one of the most promising new clean energy sources to replace coal, oil and natural gas in the 21st century, and is also a new energy source with huge reserves that have not yet been developed. The investigation, evaluation and development of natural gas hydrate resources are an important part of the national energy strategic plan.

[0003] In the process of natural gas hydrate resource exploration, in order to better study the properties of hydrate samples, it is necessary to cut and segment the pressurized samples obtained under pressure and transfer them to special storage cylinders to meet the analysis of core samples for different scientific tasks.

[0004] The existing sample pressure cutting devices in China are large in size and complicated in operation, which are not suitable for offshore natural gas hydrate exploration and construction.

[0005] Therefore, it is an urgent problem for technical personnel in this field to develop a set of sample pressure cutting devices and methods with reliable structure, small size and easy operation to promote the progress and development of natural gas hydrate resource exploration technology in my country. Summary of the invention

[0006] In view of this, the present invention provides a geological sample pressure cutting device and cutting method, aiming to solve the above technical problems.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A geological sample pressure cutting device, comprising:

[0009] An autoclave; a cylindrical high-pressure chamber is formed inside the autoclave; one end of the high-pressure chamber is connected to the outside of the autoclave to form a first installation port, and the other end of the high-pressure chamber is connected to a pressure regulating interface; a second installation port connected to the outside of the autoclave is radially opened on the side wall of the high-pressure chamber close to the first installation port;

[0010] Cutting mechanism; the cutting mechanism is sealed and connected to the second mounting port, and can realize radial feeding and cutting into the interior of the high-pressure chamber;

[0011] Rotating mechanism; the rotating mechanism is sealed and connected to the first mounting port, and one end of the rotating mechanism extending into the high-pressure chamber is connected to a sample tube, wherein the sample tube contains a sample; the rotating mechanism can drive the sample tube to rotate in the high-pressure chamber.

[0012] Through the above technical scheme, the cutting mechanism and the rotating mechanism of the present invention are connected to the autoclave to form a closed high-pressure chamber, thereby realizing the segmented cutting of geological samples under a high-pressure environment; the present invention realizes accurate segmented cutting of geological samples under pressure by designing reliable pressure cutting mechanism and rotating mechanism.

[0013] Preferably, in the above-mentioned geological sample pressure cutting device, the cutting mechanism includes a flange tube seat, a nut sleeve, a transmission shaft, a motor, a cutting tool, a floating piston and a bearing group; the flange tube seat is fastened to the outer wall of the autoclave by a first bolt, one end of the flange tube seat is inserted into the second mounting port, and the outer wall of the other end has an external thread; the inner wall of the nut sleeve has an internal thread, and is sleeved on the outer side of the flange tube seat and threadedly connected therewith; the transmission shaft is coaxially arranged inside the flange tube seat and the nut sleeve, and its shaft is fixedly connected to the nut sleeve; the power output shaft of the motor is connected to the top of the transmission shaft through a coupling; the cutting tool is connected to the bottom end of the transmission shaft; the floating piston is sleeved on the transmission shaft, and is rotationally connected to the transmission shaft, and is slidingly connected to the inside of the flange tube seat; the bearing group is sleeved on the transmission shaft and is located between the nut sleeve and the floating piston. The cutting mechanism converts rotational motion into linear motion through threads, and has strong motion stability and high feed accuracy.

[0014] Preferably, in the above-mentioned geological sample pressure cutting device, the floating piston includes a piston base rotatably connected to the transmission shaft; the two ends of the piston base are fastened to the transmission shaft through clamping nuts; there are two V-shaped seals sleeved on the piston base between the two clamping nuts, the two V-shaped seals are separated by an annular protrusion in the middle of the piston base, and the two V-shaped seals are in contact with the inner wall of the flange pipe seat. The floating piston can achieve stable up and down movement in a sealed state.

[0015] Preferably, in the above-mentioned geological sample pressure cutting device, the transmission shaft is embedded with a first rotary seal that fits with the inner wall of the piston base, which can further improve the sealing effect.

[0016] Preferably, in the above-mentioned geological sample pressure cutting device, the bearing group includes two first thrust bearings; the two first thrust bearings are separated by an annular protrusion on the transmission shaft; the two first thrust bearings are respectively in contact with the nut sleeve and the piston base, which can improve the rotation stability and maintain good radial and axial stability.

[0017] Preferably, in the above-mentioned geological sample pressure cutting device, a first O-ring is embedded in the side wall of the flange pipe seat that cooperates with the second installation opening, which can further improve the sealing effect.

[0018] Preferably, in the above-mentioned geological sample pressure cutting device, the rotating mechanism includes a rotating seat, a rotating shaft, a sample tube joint and a hand wheel; the rotating seat is sealed and installed on the first installation port; the rotating shaft passes through the rotating seat and is rotatably connected to the rotating seat; the sample tube joint is fixed to one end of the rotating shaft located inside the high-pressure chamber and is used to connect with the sample tube end; the hand wheel is connected to the other end of the rotating shaft by a set bolt. This structure can effectively realize the rotation of the sample in a sealed state, and the driving is simple and convenient.

[0019] Preferably, in the above-mentioned geological sample pressure cutting device, the rotating seat includes a sealing flange connected to the side wall of the autoclave through a second bolt, one end of the sealing flange is inserted into the first installation port, and the outer wall is nested with a second O-ring that matches the first installation port, and the rotating shaft is nested with a second rotating seal that matches the inner wall of the sealing flange; the rotating shaft is sleeved with a rolling bearing and a second thrust bearing, the rolling bearing and the second thrust bearing are separated by an annular protrusion on the rotating shaft, and the second thrust bearing is close to the hand wheel; the bearing cover passes through the rotating shaft and is fastened to the outer end face of the sealing flange by a third bolt, and presses against the second thrust bearing. The sealing effect is good and it is easy to disassemble and connect.

[0020] Preferably, in the above-mentioned geological sample pressure cutting device, the sample tube is fastened to the sample tube joint by three circumferentially arranged locking screws, which makes the connection simple, stable and easy to install.

[0021] The present invention also provides a cutting method of a geological sample pressure cutting device, comprising the following steps:

[0022] S1, installing the cutting mechanism on the second installation port;

[0023] S2, connecting the rotating mechanism to the sample tube and then to the first mounting port, so that the sample tube can rotate in the high-pressure chamber;

[0024] S3, filling the high pressure chamber with required pressure through the pressure regulating interface;

[0025] S4, after the cutting mechanism is pushed radially to cut into the required distance, the rotating mechanism drives the sample tube to rotate one circle;

[0026] S5, repeating step S4 until the cutting mechanism reaches the maximum cutting amount and completes one cutting;

[0027] S6, returning the cutting mechanism to the initial position, releasing the pressure through the pressure regulating interface, disassembling the rotating mechanism, and taking out the cut sample;

[0028] S7, repeat steps S2-S6 to achieve multiple sample pressure cutting.

[0029] Through the above method, the cutting device can be quickly installed and cut under pressure, the pressure control can be easily achieved, and the installation and disassembly and removal of the parts are convenient.

[0030] It can be seen from the above technical solution that, compared with the prior art, the present invention discloses a geological sample pressure cutting device and a cutting method. The cutting mechanism and the rotating mechanism are connected to the autoclave to form a closed high-pressure chamber, thereby realizing the segmented cutting of geological samples under a high-pressure environment. The present invention realizes accurate segmented cutting of geological samples under pressure by designing reliable pressure cutting mechanisms and rotating mechanisms. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0032] Figure 1 The accompanying drawing is a schematic structural diagram of a geological sample pressure cutting device provided by the present invention;

[0033] Figure 2 The accompanying drawing is a schematic diagram of the structure of the autoclave provided by the present invention;

[0034] Figure 3 The accompanying drawing is a schematic structural diagram of a cutting mechanism provided by the present invention;

[0035] Figure 4 The accompanying drawing is a schematic structural diagram of a floating piston provided by the present invention;

[0036] Figure 5 The accompanying drawing is a schematic structural diagram of the rotating mechanism provided by the present invention;

[0037] Figure 6 The accompanying drawing is a schematic structural diagram of the sample tube connection provided by the present invention.

[0038] in:

[0039] 10- Autoclave;

[0040] 100-high pressure chamber; 101-first installation port; 102-pressure regulating interface; 103-second installation port;

[0041] 20- cutting mechanism;

[0042] 200-flange pipe seat; 201-screw nut sleeve; 202-transmission shaft; 203-motor; 204-cutting tool; 205-floating piston; 206-first bolt; 207-coupling; 208-piston base; 209-pressure nut; 210-V-type seal; 211-first rotary seal; 212-first thrust bearing; 213-first O-ring;

[0043] 30-rotating mechanism;

[0044] 300-rotating shaft; 301-sample tube joint; 302-hand wheel; 303-fastening bolt; 304-second bolt; 305-sealing flange; 306-second O-ring; 307-second rotating seal; 308-rolling bearing; 309-second thrust bearing; 310-bearing cover; 311-third bolt; 312-locking screw;

[0045] 40-sample tube;

[0046] 400-sample. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] See attached Figure 1 To Attachment Figure 6 The embodiment of the present invention discloses a geological sample pressure cutting device, comprising:

[0049] The autoclave 10; a cylindrical high-pressure chamber 100 is formed inside the autoclave 10; one end of the high-pressure chamber 100 is connected to the outside of the autoclave 10 to form a first installation port 101, and the other end of the high-pressure chamber 100 is connected to a pressure regulating interface 102; a second installation port 103 connected to the outside of the autoclave 10 is radially opened on the side wall of the high-pressure chamber 100 near the first installation port 101;

[0050] Cutting mechanism 20; the cutting mechanism 20 is sealed and connected to the second mounting port 103, and can realize radial feeding and cutting into the interior of the high-pressure chamber 100;

[0051] The rotating mechanism 30 is sealed and connected to the first mounting port 101 , and one end thereof extending into the high pressure chamber 100 is connected to the sample tube 40 , and the sample tube 40 contains a sample 400 ; the rotating mechanism 30 can drive the sample tube 40 to rotate in the high pressure chamber 100 .

[0052] In order to further optimize the above technical solution, the cutting mechanism 20 includes a flange pipe seat 200, a nut sleeve 201, a transmission shaft 202, a motor 203, a cutting tool 204, a floating piston 205 and a bearing group; the flange pipe seat 200 is fastened to the outer wall of the autoclave 10 by a first bolt 206, one end of the flange pipe seat 200 is inserted into the second installation port 103, and the outer wall of the other end has an external thread; the inner wall of the nut sleeve 201 has an internal thread and is sleeved on the outer side of the flange pipe seat 200 and threadedly connected thereto; the transmission The shaft 202 is coaxially arranged inside the flange pipe seat 200 and the nut sleeve 201, and its shaft body is fixedly connected to the nut sleeve 201; the power output shaft of the motor 203 is connected to the top end of the transmission shaft 202 through the coupling 207; the cutting tool 204 is connected to the bottom end of the transmission shaft 202; the floating piston 205 is sleeved on the transmission shaft 202, and is rotationally connected to the transmission shaft 202, and is slidingly connected to the inside of the flange pipe seat 200; the bearing assembly is sleeved on the transmission shaft 202, and is located between the nut sleeve 201 and the floating piston 205.

[0053] In order to further optimize the above technical solution, the floating piston 205 includes a piston base 208 rotatably connected to the transmission shaft 202; both ends of the piston base 208 are fastened to the transmission shaft 202 by clamping nuts 209; there are two V-shaped seals 210 sleeved on the piston base 208 between the two clamping nuts 209, and the two V-shaped seals 210 are separated by an annular protrusion in the middle of the piston base 208, and the two V-shaped seals 210 are in contact with the inner wall of the flange pipe seat 200.

[0054] In order to further optimize the above technical solution, the transmission shaft 202 is embedded with a first rotary seal 211 that is in contact with the inner wall of the piston base 208 .

[0055] In order to further optimize the above technical solution, the bearing group includes two first thrust bearings 212; the two first thrust bearings 212 are separated by an annular protrusion on the transmission shaft 202; the two first thrust bearings 212 are respectively abutted against the nut sleeve 201 and the piston base 208.

[0056] In order to further optimize the above technical solution, a first O-ring 213 is embedded in the side wall of the flange pipe seat 200 that cooperates with the second installation opening 103 .

[0057] In order to further optimize the above technical solution, the rotating mechanism 30 includes a rotating seat, a rotating shaft 300, a sample tube connector 301 and a handwheel 302; the rotating seat is sealingly installed on the first mounting port 101; the rotating shaft 300 passes through the rotating seat and is rotatably connected to the rotating seat; the sample tube connector 301 is fixed to one end of the rotating shaft 300 located inside the high-pressure chamber 100, and is used to connect with the end of the sample tube 40; the handwheel 302 is connected to the other end of the rotating shaft 300 through a tightening bolt 303.

[0058] In order to further optimize the above technical solution, the rotating seat includes a sealing flange 305 connected to the side wall of the autoclave 10 through a second bolt 304, one end of the sealing flange 305 is inserted into the first installation port 101, and the outer wall is nested with a second O-ring 306 that cooperates with the first installation port 101, and the rotating shaft 300 is nested with a second rotating seal 307 that cooperates with the inner wall of the sealing flange 305; the rotating shaft 300 is sleeved with a rolling bearing 308 and a second thrust bearing 309, the rolling bearing 308 and the second thrust bearing 309 are separated by an annular protrusion on the rotating shaft 300, and the second thrust bearing 309 is close to the handwheel 302; the bearing cover 310 passes through the rotating shaft 300, and is fastened to the outer end face of the sealing flange 305 by a third bolt 311, and presses the second thrust bearing 309.

[0059] In order to further optimize the above technical solution, the sample tube 40 is fastened to the sample tube connector 301 by three locking screws 312 arranged circumferentially.

[0060] The cutting method of the geological sample pressure cutting device provided in this embodiment comprises the following steps:

[0061] S1, the cutting mechanism 20 is fastened to the autoclave 10 by four first bolts 206, and the first O-ring 213 forms a seal with the inner hole wall of the autoclave 10;

[0062] S2. Install the sample tube 40 containing the geological sample on the sample tube connector 301, and fix the sample tube 40 to the sample tube connector 301 by three locking screws 312. The locking screws 312 can achieve the function of fixing and transmitting torque, so that the sample tube connector 301 and the sample tube 40 can rotate synchronously;

[0063] S3, the rotating mechanism 30 is fastened to the autoclave 10 by means of six second bolts 304, and the second O-ring 306 forms a seal with the inner hole wall of the autoclave 10;

[0064] S4, charging the required pressure into the autoclave 10 through the pressure regulating interface 102, and starting the motor 203;

[0065] S5, rotate the nut sleeve 201 clockwise for four turns. Here, the number of feed turns can be appropriately adjusted according to the hardness of the sample;

[0066] S6, rotating the sample clockwise by one circle using the hand wheel 302;

[0067] S7, repeat steps S5 and S6 until the nut sleeve 201 is completely screwed into place;

[0068] S8, rotating the nut sleeve 201 counterclockwise to return to the initial position;

[0069] S9, repeat steps S2-S8 to achieve multiple sample pressure cutting.

[0070] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0071] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A geological sample pressure cutting device, characterized in that: include: An autoclave (10); a cylindrical high-pressure chamber (100) is formed inside the autoclave (10); one end of the high-pressure chamber (100) is connected to the outside of the autoclave (10) to form a first installation port (101), and the other end of the high-pressure chamber (100) is connected to a pressure regulating interface (102); a second installation port (103) connected to the outside of the autoclave (10) is radially opened on a side wall of the high-pressure chamber (100) close to the first installation port (101); A cutting mechanism (20); the cutting mechanism (20) is sealingly connected to the second mounting port (103) and is capable of radially feeding and cutting into the interior of the high-pressure chamber (100); A rotating mechanism (30); the rotating mechanism (30) is sealedly connected to the first mounting port (101), and one end of the rotating mechanism (30) extending into the interior of the high-pressure chamber (100) is connected to a sample tube (40), wherein the sample tube (40) contains a sample (400); the rotating mechanism (30) is capable of driving the sample tube (40) to rotate in the high-pressure chamber (100); The cutting mechanism (20) comprises a flange tube seat (200), a screw-nut sleeve (201), a transmission shaft (202), a motor (203), a cutting tool (204), a floating piston (205) and a bearing assembly; the flange tube seat (200) is fastened to the outer wall of the autoclave (10) via a first bolt (206); one end of the flange tube seat (200) is inserted into the second mounting port (103), and the outer wall of the other end has an external thread; the inner wall of the screw-nut sleeve (201) has an internal thread and is sleeved on the outer side of the flange tube seat (200) and threadedly connected thereto; the transmission shaft (202) is coaxially arranged on the flange tube seat The flange socket (200) is provided inside the flange socket (200) and the nut sleeve (201), and its shaft is fixedly connected to the nut sleeve (201); the power output shaft of the motor (203) is connected to the top end of the transmission shaft (202) through a coupling (207); the cutting tool (204) is connected to the bottom end of the transmission shaft (202); the floating piston (205) is sleeved on the transmission shaft (202), is rotationally connected to the transmission shaft (202), and is slidably connected to the inside of the flange socket (200); the bearing assembly is sleeved on the transmission shaft (202), and is located between the nut sleeve (201) and the floating piston (205); The floating piston (205) includes a piston base (208) rotatably connected to the transmission shaft (202); both ends of the piston base (208) are fastened to the transmission shaft (202) via clamping nuts (209); two V-shaped seals (210) sleeved on the piston base (208) are provided between the two clamping nuts (209); the two V-shaped seals (210) are spaced apart by an annular protrusion in the middle of the piston base (208), and the two V-shaped seals (210) are in contact with the inner wall of the flange pipe seat (200); The rotating mechanism (30) comprises a rotating seat, a rotating shaft (300), a sample tube joint (301) and a hand wheel (302); the rotating seat is sealingly mounted on the first mounting port (101); the rotating shaft (300) passes through the rotating seat and is rotatably connected to the rotating seat; the sample tube joint (301) is fixed to one end of the rotating shaft (300) located inside the high-pressure chamber (100) and is used to be connected to the end of the sample tube (40); the hand wheel (302) is connected to the other end of the rotating shaft (300) via a set bolt (303); The rotating seat comprises a sealing flange (305) connected to the side wall of the autoclave (10) via a second bolt (304); one end of the sealing flange (305) is inserted into the first mounting port (101), and a second O-ring (306) matching the first mounting port (101) is embedded in the outer wall; a second rotating seal (307) matching the inner wall of the sealing flange (305) is embedded on the rotating shaft (300); a rolling bearing (308) and a second thrust bearing (309) are sleeved on the rotating shaft (300); the rolling bearing (308) and the second thrust bearing (309) are separated by an annular protrusion on the rotating shaft (300), and the second thrust bearing (309) is close to the hand wheel (302); a bearing cover (310) passes through the rotating shaft (300) and is fastened to the outer end surface of the sealing flange (305) via a third bolt (311), and presses against the second thrust bearing (309).

2. A geological sample pressure cutting device according to claim 1, characterized in that: The transmission shaft (202) is embedded with a first rotating seal (211) that is in contact with the inner wall of the piston base (208).

3. A geological sample pressure cutting device according to claim 1 or 2, characterized in that: The bearing group comprises two first thrust bearings (212); the two first thrust bearings (212) are separated by an annular protrusion on the transmission shaft (202); and the two first thrust bearings (212) are respectively in contact with the nut sleeve (201) and the piston base (208).

4. The geological sample pressure cutting device according to claim 1, characterized in that: A first O-type sealing ring (213) is embedded in the side wall of the flange pipe seat (200) that cooperates with the second installation opening (103).

5. The geological sample pressure cutting device according to claim 1, characterized in that: The sample tube (40) is fastened to the sample tube connector (301) via three circumferentially arranged locking screws (312).

6. A cutting method for a geological sample under pressure cutting device according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Installing the cutting mechanism (20) on the second installation opening (103); S2, connecting the rotating mechanism (30) to the sample tube (40) and then to the first mounting port (101), so that the sample tube (40) can rotate in the high-pressure chamber (100); S3, filling the high pressure chamber (100) with required pressure through the pressure regulating interface (102); S4, after the cutting mechanism (20) is pushed forward to radially cut a required distance, the rotating mechanism (30) drives the sample tube (40) to rotate one circle; S5, repeating step S4 until the cutting mechanism (20) reaches the maximum cutting amount, completing one cutting; S6, returning the cutting mechanism (20) to an initial position, releasing pressure through the pressure regulating interface (102), disassembling the rotating mechanism (30), and taking out the cut sample (400); S7, repeat steps S2-S6 to achieve multiple sample pressure cutting.

Images