Full-size rock sample making device

Abstract

This invention relates to the field of rock sample preparation and discloses a full-size rock sample preparation device, including a base, an isolation cylinder, a casing, a forming cylinder, and an end cap. The base is provided with a positioning step A, a positioning step B, a positioning groove, and a central through hole for positioning the forming cylinder, the isolation cylinder, and the casing. The casing passes through the central through hole, and the end cap is bolted to the end of the forming cylinder. It can produce hollow cylindrical rock samples with two distinct parts: an inner and outer cement layer and a rock layer, providing simulated formation conditions for conducting complex well completion simulation experiments under high temperature and high pressure.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rock sample making, in particular to a full-size rock sample making device. BACKGROUND

[0002] The completion simulation experiment is an important means to carry out the completion technology research. In order to simulate the formation state in the completion process, the rock sample used for the experiment needs to be prepared according to the requirements. The rock sample preparation process can use natural rock for cutting and shaping, or can use raw materials for mixing, inject liquid raw materials into a mold for shaping, or use high-strength stamping equipment to press the raw materials from powder state into shape. The natural rock cutting and shaping preparation method has the advantages of not needing a mold and being able to make any rock sample into any shape, but has the problems of difficult collection and transportation of raw rock samples, long cutting and polishing time, and some rock samples with the required properties are less and expensive. The powder pressing sample preparation method has the advantages of good isotropy of the prepared rock sample and convenient rock powder material, but also has the disadvantages of needing to make a mold and using a high-pressure punch. At the same time, the stamping sample has certain requirements for the shape of the mold, which makes it difficult to complete the preparation of some rock samples with certain space forms. Relatively, the liquid injection sample has good feasibility, and only needs to reasonably mix the raw materials and make the corresponding mold to prepare.

[0003] Therefore, in view of the above-mentioned shortcomings, it is a technical problem to be solved by those skilled in the art to design a full-size rock sample making device for preparing formation simulation rock samples for completion simulation experiments. SUMMARY

[0004] The present application aims to provide a full-size rock sample making device capable of preparing formation simulation rock samples for completion simulation experiments.

[0005] The present application provides a full-size rock sample making device, comprising a base, an isolation cylinder, a sleeve, a forming cylinder, and an end cover. The base is provided with positioning steps A, B, a positioning groove, and a center through hole for positioning the forming cylinder, the isolation cylinder, and the sleeve. The sleeve passes through the center through hole, and the end cover is fixedly connected to the end of the forming cylinder by bolts.

[0006] Further, the isolation cylinder is composed of three identical isolation cylinder assemblies A and three identical isolation cylinder assemblies B. The isolation cylinder assemblies A and B have the same outer diameter and different inner diameters. The inner diameter of the isolation cylinder assembly B is the same as the outer diameter of the sleeve, and the inner wall thereof is in contact with the outer wall of the sleeve.

[0007] Further, the forming cylinder is divided into three identical forming cylinder assemblies, the forming cylinder assemblies are provided with connecting plates at two circumferential ends, the three forming cylinder assemblies are assembled into the forming cylinder by the connecting plates through bolt connection, the forming cylinder assemblies are provided with flanges at two axial ends, and the forming cylinder assemblies are bolted with the base and the end cover through the flanges.

[0008] Further, the base and the end cover are uniformly provided with 6-12 through holes at the end faces in the circumferential direction, the hole diameters and the hole positions of the 6-12 through holes are the same as those of the through hole positions of the end flanges of the forming cylinder.

[0009] Further, the included angle A of the two side faces of the isolation cylinder assembly A is 20-30°, so that the isolation cylinder assembly A and the isolation cylinder assembly B are convenient to disassemble after the rock sample is made.

[0010] Further, the connecting plates are uniformly provided with 4-8 through holes in the axial direction, and the end faces of the flanges are uniformly provided with 2-4 through holes.

[0011] The present application has the following advantages: the present application belongs to a rock sample preparation device, the combination of the special rock sample mold is used, the simulated formation rock sample meeting the high temperature and high pressure well completion simulation experiment conditions can be made, and the experimental basis for carrying out the well completion simulation experiment under special and complex working conditions is provided. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the device;

[0013] Figure 2 It is a schematic diagram of the base structure;

[0014] Figure 3 It is a schematic diagram of the isolation cylinder installation structure;

[0015] Figure 4 It is a schematic diagram of the forming cylinder part structure;

[0016] Figure 5 It is a schematic diagram of the isolation cylinder arrangement and structure;

[0017] Figures 6-12 It is a schematic diagram of the process of rock sample preparation using the device;

[0018] In the figure: 1-base, 2-isolation cylinder, 3-casing, 4-forming cylinder, 5-end cover, 101-positioning step A, 102-positioning step B, 103-positioning groove, 104-center through hole, 201-isolation cylinder assembly A, 202-isolation cylinder assembly B, 401-forming cylinder assembly, 402-connecting plate, 403-flange. DETAILED DESCRIPTION

[0019] The present application will be further described below in combination with the drawings, and the protection scope of the present application is not limited to the following description:

[0020] As Figures 1-5 shown, the full-size rock sample making device comprises a base 1, a spacer cylinder 2, a sleeve 3, a forming cylinder 4, and an end cover 5. The base 1 is provided with positioning steps A101, positioning steps B102, a positioning groove 103, and a central through hole 104 for positioning the forming cylinder 2, the spacer cylinder 1, and the sleeve 3. The sleeve 3 passes through the central through hole 104, and the end cover 5 is fixed to the end of the forming cylinder 4 by bolt connection.

[0021] The spacer cylinder 2 is composed of three identical spacer cylinder assemblies A201 and three identical spacer cylinder assemblies B202. The spacer cylinder assemblies A201 and B202 have the same outer diameter but different inner diameters. When assembled, the three spacer cylinder assemblies A201 are evenly distributed along the positioning groove 103, and then the spacer cylinder assemblies B202 are embedded in the gaps between the three spacer cylinder assemblies A201 to form the spacer cylinder 2. The inner diameter of the spacer cylinder assembly B202 is the same as the outer diameter of the sleeve 3, and the inner wall of the spacer cylinder assembly B202 is in contact with the outer wall of the sleeve 3.

[0022] The forming cylinder 4 is divided into three identical forming cylinder assemblies 401. The forming cylinder assemblies 401 are provided with connecting plates 402 at both ends of the circumference. The three forming cylinder assemblies 401 are assembled into the forming cylinder 4 by bolt connection through the connecting plates 402. The forming cylinder assemblies 401 are provided with flanges 403 at both axial ends. The forming cylinder assemblies 401 are fixed to the base 2 and the end cover 5 by bolt connection through the flanges 403.

[0023] The connecting plates 402 are evenly distributed with 4-8 through holes in the axial direction, and the flanges 403 are evenly distributed with 2-4 through holes in the end face.

[0024] The base 1 and the end cover 5 are evenly distributed with 6-12 through holes in the circumferential direction. The hole diameter and hole position are the same as the through hole position of the end flange 403 of the forming cylinder 4.

[0025] As Figures 6-12 , the steps for making the rock sample using the rock sample making device are as follows:

[0026] S1: Assemble the spacer cylinder assemblies A201 and B202 along the positioning steps B102 and the positioning groove 103 in the circumferential direction.

[0027] S2: Assemble the forming cylinder 4 and the end cover 5 in sequence and fasten them using bolt connection.

[0028] S3: Inject rock mixing material into the device and wait for the material to solidify.

[0029] S4: After the rock material solidifies, remove the spacer cylinder assemblies B202 and A201 in sequence.

[0030] S5: connecting end cap 5, injecting cement material into it, waiting for the material to solidify;

[0031] S6: disassembling base 1, forming cylinder 4 and end cap 5, and the required rock sample is obtained.

[0032] The above only is the preferred embodiment of the present application, and is not used to limit the present application, for the person skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A full-size rock sample making device, characterized by: It comprises a base (1), an isolation cylinder (2), a sleeve (3), a forming cylinder (4) and an end cover (5); The base (1) is provided with a positioning step A (101), a positioning step B (102), a positioning groove (103) and a center through hole (104), the positioning step A (101) is used for positioning the forming cylinder (4), the positioning step B (102) and the positioning groove (103) are used for positioning the isolation cylinder (2); The sleeve (3) passes through the center through hole (104), the end cover (5) is fixedly connected with the end of the forming cylinder (4) by bolt connection, and the base (1) and the end cover (5) are located at two ends of the forming cylinder (4) respectively; The isolation cylinder (2) is composed of three identical isolation cylinder assemblies A (201) and three identical isolation cylinder assemblies B (202), the isolation cylinder assembly A (201) and the isolation cylinder assembly B (202) have the same outer diameter and different inner diameters; the inner diameter of the isolation cylinder assembly A (201) is the same as the outer diameter of the sleeve (3), the inner wall of the isolation cylinder assembly A (201) is in contact with the outer wall of the sleeve (3), and the inner diameter of the isolation cylinder assembly A (201) is smaller than the inner diameter of the isolation cylinder assembly B (202); during assembly, the three isolation cylinder assemblies A (201) are uniformly distributed along the positioning groove (103) first, and then the isolation cylinder assembly B (202) is embedded into the gap between the three isolation cylinder assemblies A (201), so as to assemble into the isolation cylinder (2); The forming cylinder (4) is divided into three identical forming cylinder assemblies (401), the forming cylinder assembly (401) is provided with a connecting plate (402) at the circumferential two ends, and the three forming cylinder assemblies (401) are assembled into the forming cylinder (4) by bolt connection through the connecting plate (402); the forming cylinder assembly (401) is provided with a flange (403) at the axial two ends, and the flanges (403) between the forming cylinder assemblies (401) are bolted with the base (1) and the end cover (5); The steps for making the required rock sample by using the full-size rock sample making device are as follows: S1: the isolation cylinder assembly A (201) and the isolation cylinder assembly B (202) are assembled along the positioning step B (102) and the positioning groove (103) in the circumferential direction; S2: the forming cylinder (4) and the base (1) are assembled in sequence, and are fastened by bolt connection; S3: rock mixed materials are injected into the device, the end cover (5) is connected, and the materials are allowed to solidify; S4: after the rock materials solidify, the end cover (5) is disassembled, and then the isolation cylinder assembly B (202) and the isolation cylinder assembly A (201) are taken out in sequence; S5: cement materials are injected into the device, the end cover (5) is connected, and the materials are allowed to solidify; S6: the base (1), the forming cylinder (4) and the end cover (5) are disassembled, and the required rock sample can be obtained.

2. The full-size rock sample making device according to claim 1, wherein: The end faces of the base (1) and the end cover (5) are uniformly distributed with 6-12 through holes in the circumferential direction, the hole diameters and hole positions of the 6-12 through holes are the same as the through hole positions of the end flange (403) of the forming cylinder (4).

3. The full-size rock sample making device of claim 1, wherein: The included angle A of the two side faces of the isolation cylinder assembly A (201) is 20-30°, facilitating the disassembly of the isolation cylinder assembly A (201) and the isolation cylinder assembly B (202) after the rock sample is made.

4. The full-size rock sample making device of claim 1, wherein: The connecting plate (402) is uniformly provided with 4-8 through holes in the axial direction, and the flange (403) is uniformly provided with 2-4 through holes in the end face.

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