Sample preparation device and method for pore size analyzer of shale nanopores

Abstract

The present invention relates to a sample preparation device and preparation method for an aperture analyzer of shale nanopores. The sample preparation device comprises a fixed frame, a cutting mechanism and a vacuum pump. The fixed frame comprises a base for supporting shale and a frame fixedly mounted on the base, and a leakage hole running through the base is provided; the cutting mechanism comprises a hanging plate, a cutting cylinder rotatably supported on the hanging plate and facing the leakage hole, a rotating drive assembly arranged between the hanging plate and the cutting cylinder and used to drive the cutting cylinder to rotate, and a lifting drive assembly arranged between the frame and the hanging plate and used to drive the hanging plate to lift; the vacuum pump is mounted on the hanging plate, and is rotatably connected to the middle position of the top of the cutting cylinder through a connecting pipe, and is used to perform a vacuum operation on the cutting cylinder during the process of the cutting mechanism cutting the shale sample. The present invention can efficiently prepare shale samples, and remove debris in the pores of the shale samples during the preparation of the shale samples to ensure the infiltration effect.

Description

Technical Field

[0001] The invention relates to the technical field of shale sample preparation, and in particular to a sample preparation device and a preparation method for a shale nanopore pore size analyzer. Background Art

[0002] Energy crisis and greenhouse effect have become major issues facing the world, and are directly related to many fields such as economy, environment, and people's livelihood. The CO2 throughput of shale oil reservoirs can not only improve the recovery rate of shale oil and ensure energy security, but also effectively seal CO2 and achieve the purpose of controlling the greenhouse effect. However, in the process of developing shale oil reservoirs by CO2 huff and puff, the pore pressure field in the shale reservoir will change due to the injection and output of fluids, which will cause changes in adsorption characteristics and pore throat structure. There is a complex coupling and synergy between the pore pressure field, adsorption characteristics and nano-pore throat deformation field. Therefore, instruments such as pore size analyzers are needed to study the influence of shale pore size on adsorption characteristics. The main method of using the pore size analyzer is: the infiltrated sample is placed in a dedicated PSDA test assembly, and compressed gas is introduced into the sample after sealing. Since the sample pores are blocked by liquid, a certain pressure is required to open the pores, and the smaller the pore size, the greater the corresponding opening pressure. As the gas pressure increases, the first pore to be opened is the largest pore of the sample, and the last pore to be opened is the smallest pore. Therefore, the pore size and opening pressure are one-to-one corresponding. By detecting the gas pressure-flow relationship curve of the sample in dry and wet states, the pore size distribution of the shale sample can be calculated. When using the pore size analyzer, shale samples need to be prepared.

[0003] The sample preparation mechanism of the existing shale pore size analyzer is simple, the efficiency of preparing shale samples is low, and it is inconvenient to remove the debris in the pores of the shale samples, which causes the pores of the shale samples to be blocked and affects the infiltration of the shale samples. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a sample preparation device for a shale nanopore pore size analyzer, which can efficiently prepare shale samples and remove debris in the pores of the shale samples during the preparation process to ensure the infiltration effect.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a sample preparation device for a shale nanopore pore size analyzer, which comprises:

[0006] A fixed frame, comprising a base for supporting shale and a frame fixedly mounted on the base, wherein the base is provided with a sample leakage hole penetrating from top to bottom;

[0007] The cutting mechanism comprises a hanging plate, a cutting cylinder rotatably supported on the hanging plate and facing the sample leakage hole, a rotating driving component disposed between the hanging plate and the cutting cylinder and used to drive the cutting cylinder to rotate, and a lifting driving component disposed between the frame and the hanging plate and used to drive the hanging plate to lift;

[0008] A vacuum pump is installed on the hanging plate and is rotatably connected to the middle position of the top of the cutting barrel through a connecting pipe, and is used to perform a vacuum operation on the cutting barrel during the process of the cutting mechanism cutting the shale sample.

[0009] Further, the rotation drive assembly comprises:

[0010] A driven gear fixedly sleeved on the outer peripheral wall of the cutting cylinder;

[0011] A driving gear, rotatably supported on the hanging plate and meshing with the driven gear;

[0012] The first motor is connected to the driving gear and is used to drive the driving gear to rotate.

[0013] Furthermore, the lifting drive assembly comprises:

[0014] A bidirectional screw, rotatably supported on the frame;

[0015] Two moving blocks, each of which is threadedly connected to one end of the bidirectional screw and connected to the hanging plate via a transmission rod, and the transmission rod is hinged to the moving block and the hanging plate respectively;

[0016] The second motor is connected to the bidirectional screw and is used to drive the bidirectional screw to rotate.

[0017] Furthermore, it also includes a flat cutting mechanism, and the flat cutting mechanism includes:

[0018] Flush cutter;

[0019] The translation drive assembly is arranged between the frame and the horizontal cutter, and is used for driving the horizontal cutter to translate so as to horizontally cut the shale.

[0020] Furthermore, a buffer sponge pad is fixedly installed on the inner top of the cutting cylinder.

[0021] Furthermore, the sample preparation device for the pore size analyzer of shale nanopores also includes an infiltration tube, which is directly opposite to the sample leakage hole and is used to receive the shale sample falling from the sample leakage hole.

[0022] Furthermore, the sample preparation device for the pore size analyzer of shale nanopores also includes a sampling mechanism, and the sampling mechanism includes:

[0023] A sample guide box, connected to the lower end of the infiltration tube, for receiving the shale sample falling from the infiltration tube;

[0024] The first sliding rod passes through one side surface of the sample guiding box, and a first pushing plate is fixed to an end portion of the first sliding rod located inside the sample guiding box.

[0025] Furthermore, the sampling mechanism further comprises:

[0026] A bottom cylinder, connected to the lower end of the sample guide box, used to receive the shale sample dropped from the sample guide box, wherein the bottom cylinder and the infiltration cylinder are staggered with each other;

[0027] A sample outlet tube is connected to the upper end of the sample guide box and faces the bottom tube, and the upper end of the sample outlet tube is open;

[0028] The second sliding rod passes through the bottom of the bottom tube, and a second push plate is fixed to the end of the second sliding rod located inside the bottom tube.

[0029] The present invention also provides a method for preparing a sample for a pore size analyzer of shale nanopores, the method comprising the following steps:

[0030] First, place the shale on the base and cover the sample hole with the shale;

[0031] Then, the lifting drive assembly drives the hanging plate to descend; during the process of the hanging plate descending, the rotary drive assembly drives the cutting barrel to rotate to cut and drill shale samples; during the process of the cutting barrel cutting the shale sample, the vacuum pump performs a vacuum operation on the cutting barrel to remove debris in the gaps of the shale sample.

[0032] Furthermore, the method steps also include:

[0033] The cut shale sample falls from the sample leakage hole into the infiltration tube or the sample guide box for infiltration, wherein the infiltration tube and the sample guide box are pre-filled with infiltration liquid;

[0034] After the infiltration is completed, the first slide bar is moved to push the shale sample through the first push plate, so that the shale sample falls into the bottom tube, and then the second slide bar is moved to push the sample out of the sample tube through the second push plate.

[0035] After adopting the above technical solution, the present invention has the following beneficial effects:

[0036] 1. In the process of preparing shale samples, shale is first placed on the base and covers the sample leakage hole; then, the lifting drive assembly drives the hanging plate to descend; during the process of the hanging plate descending, the rotary drive assembly drives the cutting barrel to rotate to cut and drill the shale sample; during the process of the cutting barrel cutting the shale sample, the vacuum pump performs a vacuum operation on the cutting barrel to remove the debris in the gap of the shale sample. The present invention improves the preparation efficiency of the shale sample, and conveniently removes the debris in the pores of the shale sample during the preparation process, thereby improving the infiltration effect of the shale sample;

[0037] 2. The present invention can also cut shale flatly through a flat cutting mechanism to ensure the flatness of the surface of the prepared shale sample, facilitating pore size analysis of the sample;

[0038] 3. The present invention can easily take out the infiltrated sample through the sampling mechanism for use, which is convenient and saves trouble, and further improves the preparation efficiency of shale samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of a sample preparation device for a pore size analyzer of shale nanopores according to the present invention from a first perspective;

[0040] Figure 2 It is a structural schematic diagram of a second viewing angle of the sample preparation device for the pore size analyzer of shale nanopores of the present invention;

[0041] Figure 3 It is a schematic structural diagram of a sample preparation device for a pore size analyzer of shale nanopores according to the present invention from a third viewing angle;

[0042] Figure 4 It is a schematic structural diagram of a sample preparation device for a pore size analyzer of shale nanopores according to the present invention from a fourth viewing angle;

[0043] Figure 5 for Figure 1 The main view;

[0044] Figure 6 It is a schematic diagram of the structure inside the sample guide box of the present invention;

[0045] Figure 7 It is a schematic structural diagram of the cutting tube of the present invention.

[0046] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0047] 1-base, 101-infiltration cylinder, 102-leakage hole, 103-pillar, 104-frame, 105-bidirectional screw, 106-moving block, 107-transmission rod, 108-hanging plate, 109-cutting cylinder, 110-driven gear, 111-driving gear, 112-vacuum pump, 113-first motor, 114-second motor, 115-screw, 116-sliding block, 117-hanging rod, 118-flat cutter, 119-third motor, 120-sample guide box, 121-first sliding rod, 122-first push plate, 123-bottom cylinder, 124-second sliding rod, 125-second push plate, 126-sample outlet cylinder. DETAILED DESCRIPTION

[0048] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0049] like Figures 1 to 7 As shown, a sample preparation device for a pore size analyzer of shale nanopores comprises:

[0050] The fixed frame includes a base 1 for supporting shale and a frame 104 fixedly mounted on the base 1, wherein the base 1 is provided with a sample leakage hole 102 penetrating from top to bottom;

[0051] The cutting mechanism includes a hanging plate 108, a cutting cylinder 109 rotatably supported on the hanging plate 108 and facing the sample leakage hole 102, a rotating driving component provided between the hanging plate 108 and the cutting cylinder 109 and used to drive the cutting cylinder 109 to rotate, and a lifting driving component provided between the frame 104 and the hanging plate 108 and used to drive the hanging plate 108 to move up and down;

[0052] The vacuum pump 112 is installed on the hanging plate 108 and is rotatably connected to the middle position of the top of the cutting barrel 109 through a connecting pipe, and is used to perform a vacuum operation on the cutting barrel 109 during the process of the cutting mechanism cutting the shale sample.

[0053] In this embodiment, a plurality of pillars 103 are fixed on the upper surface of the base 1 , and the frame 104 is installed on the upper ends of the pillars 103 .

[0054] In the process of preparing shale samples, shale is first placed on the base 1, and the shale covers the sample leakage hole 102; then, the lifting drive assembly drives the hanging plate 108 to descend; during the descent of the hanging plate 108, the rotary drive assembly drives the cutting cylinder 109 to rotate to cut and drill the shale sample; during the cutting cylinder 109 cutting the shale sample, the vacuum pump 112 performs a vacuum operation on the cutting cylinder 109 to remove the debris in the pores of the shale sample. The present invention improves the preparation efficiency of shale samples, and conveniently removes the debris in the pores of the shale samples during the preparation process, thereby improving the infiltration effect of the shale samples.

[0055] like Figure 1 , 2 As shown in , 3, 4, 5, and 6, the sample preparation device for the pore size analyzer of shale nanopores further includes an infiltration tube 101, which is directly opposite to the sample leakage hole 102 and is used to receive the shale sample falling from the sample leakage hole 102. The infiltration tube 101 is installed at the bottom end of the base 1.

[0056] In this embodiment, a buffer sponge pad is fixedly installed on the inner top of the cutting barrel 109. The vacuum pump 112 makes the inside of the cutting barrel 109 in a vacuum state through the connecting pipe, so that the cutting barrel 109 sucks the shale sample upward, and the shale sample presses upward on the buffer sponge pad on the inner top of the cutting barrel 109, thereby sucking out the debris in the pores of the shale sample, and the buffer sponge pad can play a buffering role.

[0057] like Figure 4 , 7 As shown, the rotary drive assembly includes:

[0058] A driven gear 110 is fixedly mounted on the outer peripheral wall of the cutting cylinder 109;

[0059] A driving gear 111 is rotatably supported on the hanging plate 108 and meshes with the driven gear 110;

[0060] The first motor 113 is connected to the driving gear 111 and is used to drive the driving gear 111 to rotate.

[0061] like Figure 1 , 2 As shown in , 3, 4, and 5, the lifting drive assembly includes:

[0062] A bidirectional screw 105, rotatably supported on the frame 104;

[0063] Two moving blocks 106, each moving block 106 is threadedly connected to one end of the bidirectional screw 105, and connected to the hanging plate 108 through a transmission rod 107, and the transmission rod 107 is hinged to the moving block 106 and the hanging plate 108 respectively;

[0064] The second motor 114 is connected to the bidirectional screw 105 and is used to drive the bidirectional screw 105 to rotate.

[0065] like Figure 1 , 2 As shown in 3, the sample preparation device for the pore size analyzer of shale nanopores also includes a flat cutting mechanism, and the flat cutting mechanism includes:

[0066] Flat cutter 118;

[0067] The translation drive assembly is disposed between the frame 104 and the flat cutter 118 and is used to drive the flat cutter 118 to translate so as to flatly cut the shale.

[0068] In this embodiment, the translation drive assembly includes two screw rods 115, two sliders 116, two suspension rods 117 and two third motors 119. The two screw rods 115 are arranged in parallel and are respectively rotatably supported on the frame 104. Each slider 116 is threadedly connected to a screw rod 115. The upper end of each suspension rod 117 is connected to a slider 116, and the lower end is connected to the horizontal cutter 118. The third motor 119 is connected to a screw rod 115 to drive the screw rod 115 to rotate.

[0069] Specifically, before the flat cutting mechanism is actuated, the moving block 106 brings the hanging plate 108 down through the transmission rod 107, and the hanging plate 108 brings the cutting cylinder 109 down and presses on the shale, fixing the shale on the base 1, and then the third motor 119 brings the slider 116 to move horizontally through the screw rod 115, and the slider 116 brings the flat cutting knife 118 to move horizontally through the hanging rod 117, so that the flat cutting knife 118 cuts the shale, and then the shale is manually turned over and placed on the leakage hole 102 of the base 1, so that the flat cutting knife 118 cuts the shale again, thereby ensuring the flatness of the surface of the prepared shale sample, facilitating the pore size analysis of the shale sample, having a high degree of automation, facilitating sample preparation, and improving the shale preparation efficiency.

[0070] like Figure 1 , 2 As shown in , 3, 4, 5, and 6, the sample preparation device for the pore size analyzer of shale nanopores also includes a sampling mechanism, and the sampling mechanism includes:

[0071] A sample guide box 120 is connected to the lower end of the infiltration tube 101 and is used to receive the shale sample falling from the infiltration tube 101;

[0072] The first sliding rod 121 passes through one side surface of the sample guiding box 120 , and a first pushing plate 122 is fixed to the end of the first sliding rod 121 located inside the sample guiding box 120 .

[0073] like Figure 1 ,2 As shown in , 3, 4, 5, and 6, the sampling mechanism also includes:

[0074] A bottom cylinder 123 is connected to the lower end of the sample guide box 120 and is used to receive the shale sample dropped from the sample guide box 120. The bottom cylinder 123 and the infiltration cylinder 101 are staggered with each other.

[0075] The sample outlet tube 126 is connected to the upper end of the sample guide box 120 and faces the bottom tube 123. The upper end of the sample outlet tube 126 is open.

[0076] The second sliding rod 124 passes through the bottom of the bottom tube 123 , and a second push plate 125 is fixed to the end of the second sliding rod 124 located inside the bottom tube 123 .

[0077] Specifically, the cut shale sample falls from the sample leakage hole 102 into the infiltration tube 101 or the sample guide box 120 for infiltration. The infiltration tube 101 and the sample guide box 120 are pre-filled with infiltration liquid; after the infiltration is completed, the first slide bar 121 is actuated, and the shale sample is pushed by the first push plate 122, so that the shale sample falls into the bottom tube 123, and then the second slide bar 124 is actuated, and the sample is pushed out of the sample outlet tube 126 by the second push plate 125, so that the infiltrated shale sample can be easily taken out.

[0078] The vacuum pump 112 , the first motor 113 , the second motor 114 , and the third motor 119 are electrically connected to the existing PLC controller via wires, respectively, and all electricity is provided by an external power supply.

[0079] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A sample preparation device for a pore size analyzer of shale nanopores, characterized in that: It includes: A fixed frame, comprising a base (1) for supporting shale and a frame (104) fixedly mounted on the base (1), wherein the base (1) is provided with a sample leakage hole (102) penetrating vertically; The cutting mechanism comprises a hanging plate (108), a cutting cylinder (109) rotatably supported on the hanging plate (108) and facing the sample leakage hole (102), a rotation driving component provided between the hanging plate (108) and the cutting cylinder (109) and used to drive the cutting cylinder (109) to rotate, and a lifting driving component provided between the frame (104) and the hanging plate (108) and used to drive the hanging plate (108) to move up and down; a vacuum pump (112), mounted on the hanging plate (108), rotatably connected to the middle position of the top of the cutting barrel (109) through a connecting pipe, and used for performing a vacuum operation on the cutting barrel (109) during the process of the cutting mechanism cutting the shale sample; An infiltration tube (101), the infiltration tube (101) facing the sample leakage hole (102) and used for receiving the shale sample falling from the sample leakage hole (102); Sampling agencies, including: A sample guide box (120) connected to the lower end of the infiltration tube (101) and used for receiving the shale sample falling from the infiltration tube (101); The first sliding rod (121) passes through a side surface of the sample guiding box (120), and a first pushing plate (122) is fixed to an end portion of the first sliding rod (121) located inside the sample guiding box (120).

2. The sample preparation device for shale nanopore pore size analyzer according to claim 1, characterized in that: The rotary drive assembly comprises: A driven gear (110) fixedly sleeved on the outer peripheral wall of the cutting cylinder (109); A driving gear (111) is rotatably supported on the hanging plate (108) and meshes with the driven gear (110); The first motor (113) is connected to the driving gear (111) and is used to drive the driving gear (111) to rotate.

3. The sample preparation device for shale nanopore pore size analyzer according to claim 1, characterized in that: The lifting drive assembly comprises: A bidirectional screw (105) rotatably supported on the frame (104); Two moving blocks (106), each moving block (106) is threadedly connected to one end of the bidirectional screw rod (105), and is connected to the hanging plate (108) via a transmission rod (107), and the transmission rod (107) is hinged to the moving block (106) and the hanging plate (108) respectively; The second motor (114) is connected to the bidirectional screw (105) and is used to drive the bidirectional screw (105) to rotate.

4. The sample preparation device for shale nanopore pore size analyzer according to claim 1, characterized in that: It also includes a flat cutting mechanism, the flat cutting mechanism comprising: Flat cutter (118); A translation drive assembly is provided between the frame (104) and the flat cutter (118), and is used to drive the flat cutter (118) to translate so as to flatly cut the shale.

5. The sample preparation device for shale nanopore pore size analyzer according to claim 1, characterized in that: A buffer sponge pad is fixedly mounted on the inner top of the cutting cylinder (109).

6. The sample preparation device for shale nanopore pore size analyzer according to claim 1, characterized in that: The sampling mechanism also includes: A bottom cylinder (123) connected to the lower end of the sample guide box (120) and used for receiving the shale sample dropped from the sample guide box (120); the bottom cylinder (123) and the infiltration cylinder (101) are staggered with each other; A sample outlet tube (126) is connected to the upper end of the sample guide box (120) and is directly opposite to the bottom tube (123); the upper end of the sample outlet tube (126) is open; The second sliding rod (124) passes through the bottom of the bottom tube (123), and a second push plate (125) is fixed to the end of the second sliding rod (124) located inside the bottom tube (123).

7. A method for preparing a sample for a pore size analyzer of shale nanopores, characterized in that: The sample preparation device for pore size analyzer of shale nanopores according to any one of claims 1 to 5 comprises the following steps: First, place shale on the base (1) and make the shale cover the sample leakage hole (102); Then, the lifting drive assembly drives the hanging plate (108) to descend; during the process of the hanging plate (108) descending, the rotation drive assembly drives the cutting barrel (109) to rotate so as to cut and drill shale samples; during the process of the cutting barrel (109) cutting the shale sample, the vacuum pump (112) performs a vacuum operation on the cutting barrel (109) to remove debris in the gaps of the shale sample.

8. The method for preparing a sample for a pore size analyzer of shale nanopores according to claim 7, characterized in that: The sample preparation device for the pore size analyzer of shale nanopores according to claim 6 further comprises the following steps: The cut shale sample falls from the sample leakage hole (102) into the infiltration tube (101) or the sample guide box (120) for infiltration, wherein the infiltration tube (101) and the sample guide box (120) are pre-filled with infiltration liquid; After the infiltration is completed, the first slide bar (121) is actuated to push the shale sample through the first push plate (122) so that the shale sample falls into the bottom tube (123), and then the second slide bar (124) is actuated to push the sample out of the sample outlet tube (126) through the second push plate (125).

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