Multi-size artificial rock sample preparation device and sample preparation method thereof

Abstract

The invention discloses a multi-size artificial rock sample preparation device and a sample preparation method thereof. The method comprises the following steps: 1, determining the size of a core to be prepared, and selecting a proper core preparation system; 2, determining mineral components and contents according to a physical property analysis result of the target rock core and physical characteristics of the rock, and placing the mineral components and contents into a rock core preparation system; 3, putting an upper cover of the rock core preparation system, and aligning a pressure head on the cover with a pressure head on a compressor; 4, pressing down a pressure head of a compressor through a control system to complete preparation of a rock core sample with the same physical property as an original reservoir; and 5, lifting the pressure head of the compressor through the control system, and taking out the artificial original physical rock core sample. According to the technical scheme, the requirements of different mechanical experiments on the size and shape of the sample can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum geology, and relates to a multi-size artificial rock sample preparation device and a sample preparation method thereof, and specifically relates to a multi-size artificial sample preparation device and a method for preparing artificial samples of different sizes and lithological characteristics, which are suitable for indoor experiments in rock geomechanics. Background Art

[0002] With the continuous development of oil and gas reservoirs, the energy of easily developed reservoirs has gradually become scarce, and there is an urgent need to develop unconventional oil and gas. However, unconventional oil and gas development faces a series of problems such as complex geological conditions, high technical difficulty in development, deep wells, high drilling costs, and difficulty in coring. Downhole coring is expensive and seriously affects the normal drilling progress. Therefore, downhole cores are extremely precious and the number is small. It is difficult for researchers to obtain a certain number of natural cores for indoor experimental research, which seriously restricts the scientific and engineering progress related to the development of unconventional oil and gas reservoirs.

[0003] At present, artificial samples are mainly screened based on rock porosity, uniaxial compressive strength, density and other conditions. This method only considers some properties of the rock and does not consider the parameter changes caused by the rock mineral components in the experiment. At present, the artificial sample device can only prepare samples of a certain size, which cannot meet the requirements of different mechanical experiments for sample size and shape. It is urgent to invent a multi-size artificial sample preparation device and sample preparation method. Summary of the invention

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the object of the present invention is to provide a multi-size artificial rock sample preparation device and a sample preparation method thereof, which can meet the requirements of different mechanical experiments on sample size and shape.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: A multi-size artificial rock sample preparation device and sample preparation method thereof, characterized in that it comprises the following steps: Step 1: Take a 120mm*120mm*120mm cubic iron block 1; Step 2: Take out cube 2 with a length of 100 mm, a width of 100 mm, and a height of 110 mm from the bottom of cube 1 at a distance of 10 mm, and keep the inner wall flat; Step 3: Take out a central column 1 with a diameter of 50 mm and a height of 110 mm from the bottom center of the cube 2, and keep the inner wall flat; Step 4: Take out the central cylinder 2 with a diameter of 25 mm and a height of 55 mm from the bottom of the cylinder 1 at a distance of 55 mm, and keep the inner wall intact; Step 5: Use the same material to make top cover 1 with a side length of 100 mm and a thickness of 10 mm, top cover 2 with a diameter of 50 mm and a thickness of 10 mm, and top cover 3 with a diameter of 25 mm and a thickness of 5 mm; Step 6: Install a 20mm diameter pressure head at the center of top covers 1, 2, and 3; Step 7: Select PLC as the control system of the multi-size artificial sample preparation device, and set four control modes including motor start, shut down, rise and fall; Step 8: Assemble the control system, pressure head and multi-size core preparation system parts.

[0006] The friendly effects of the present invention are: The technical solution of the present invention can realize the requirements of different mechanical experiments on the size and shape of the specimen. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a flow chart of the steps for preparing multi-size artificial original physical specimens; Figure 2 This is the appearance diagram of the system for preparing multi-size artificial original material specimens; Figure 3 This is the appearance diagram of the control system for multi-size artificial original property samples; Figure 4 Process diagram of manual sample preparation for the small cylindrical standard core sample preparation device; Figure 5 The process of removing the artificial sample from the mold after preparation. Specific implementation plan

[0008] The present invention is further described below in conjunction with the accompanying drawings and implementation modes.

[0009] like Figures 1 to 5 As shown, a multi-size artificial rock sample preparation device and a sample preparation method thereof are characterized by comprising the following steps: Step 1: Take a 120mm*120mm*120mm cubic iron block 1; Step 2: Take out cube 2 with a length of 100 mm, a width of 100 mm, and a height of 110 mm from the bottom of cube 1 at a distance of 10 mm, and keep the inner wall flat; Step 3: Take out a central column 1 with a diameter of 50 mm and a height of 110 mm from the bottom center of the cube 2, and keep the inner wall flat; Step 4: Take out the central cylinder 2 with a diameter of 25 mm and a height of 55 mm from the bottom of the cylinder 1 at a distance of 55 mm, and keep the inner wall intact; Step 5: Use the same material to make top cover 1 with a side length of 100 mm and a thickness of 10 mm, top cover 2 with a diameter of 50 mm and a thickness of 10 mm, and top cover 3 with a diameter of 25 mm and a thickness of 5 mm; Step 6: Install a 20mm diameter pressure head at the center of top covers 1, 2, and 3; Step 7: Select PLC as the control system of the multi-size artificial sample preparation device, and set four control modes including motor start, shut down, rise and fall; Step 8: Assemble the control system, pressure head and multi-size core preparation system parts.

[0010] How to use: Step 1: Determine the size of the core to be prepared and select the appropriate core preparation system; Step 2: Determine the mineral composition and content based on the physical property analysis results and rock physical characteristics of the target core, and place it into the core preparation system; Step 3: Put the upper cover of the core preparation system into place and align the upper pressure head of the cover with the upper pressure head of the compressor; Step 4: Press down the compressor head through the control system to complete the preparation of core samples with the same physical properties as the original reservoir; Step 5: Raise the compressor pressure head through the control system and take out the artificial original physical core sample.

Claims

1. A multi-size artificial rock sample preparation device and sample preparation method, characterized in that: The steps include: Step 1: Take a 120mm*120mm*120mm cubic iron block 1; Step 2: Take out cube 2 with a length of 100 mm, a width of 100 mm, and a height of 110 mm from the bottom of cube 1 at a distance of 10 mm, and keep the inner wall flat; Step 3: Take out a central column 1 with a diameter of 50 mm and a height of 110 mm from the bottom center of the cube 2, and keep the inner wall flat; Step 4: Take out the central cylinder 2 with a diameter of 25 mm and a height of 55 mm from the bottom of the cylinder 1 at a distance of 55 mm, and keep the inner wall intact; Step 5: Use the same material to make top cover 1 with a side length of 100mm and a thickness of 10mm, top cover 2 with a diameter of 50mm and a thickness of 10mm, and top cover 3 with a diameter of 25mm and a thickness of 5mm; Step 6: Install a 20mm diameter pressure head at the center of top covers 1, 2, and 3; Step 7: Select PLC as the control system of the multi-size artificial sample preparation device, and set four control modes including motor start, shut down, rise and fall; Step 8: Assemble the control system, pressure head and multi-size core preparation system parts.

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