Hard and brittle mud shale crack opening simulation method
A simulation method and technology of shale, applied in the direction of strength characteristics, preparation of test samples, and the use of applied stable tension/pressure to test the strength of materials, etc., can solve the problem of the inability to effectively study the crack opening speed and law of hard and brittle shale. And other issues
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Embodiment 1
[0041] Embodiment 1 provides a hard and brittle shale fracture opening simulation device, and its structure will be described in detail below.
[0042] refer to Figure 1 to Figure 3 The method for simulating crack opening in hard and brittle shale comprises a container for loading a core column sample, a circumferential pressure device for the core column sample and a pressure applying device above the core column sample.
[0043] Among them, the core column sample is a cylinder, which is derived from hard and brittle mud shale. Before the test, the hard and brittle mud shale needs to be processed. A preferred way is to perform core sampling on the hard and brittle shale to obtain a cylindrical core column as the core column sample 6 . If the hard and brittle shale sample is very small and only the core block 100 can be obtained, the core block 100 needs to be poured to form a cylinder core column sample 6 comprising the core block 100 before the experiment, and the size is ...
Embodiment 2
[0075] Embodiment 2 provides a kind of hard and brittle mud shale fracture opening simulation method, adopts the hard and brittle mud shale crack opening simulation device that embodiment 1 provides, and this method comprises the following steps:
[0076] Core column sample production: core column sample 6 was obtained by drilling core samples of hard and brittle shale samples;
[0077] If the amount of hard and brittle shale samples is sufficient, core sampling is performed on the hard and brittle shale, and a cylindrical core column is obtained as a core column sample.
[0078] Wrapping the core column sample: smear transparent silica gel on the contact surface of the core column cover 41 and the core column sample 6, and wrap the core column cover 41 around the core column sample 6 through the transparent silica gel. A first sealing ring 44 is embedded in the groove;
[0079] Load the core column sample: load the core column cover 41 wrapped with the core column sample 6 i...
Embodiment 3
[0095] On the basis of embodiment 1, embodiment 3 improves the step of installing the pressure device above the core column sample and the step of applying pressure to the core column sample 6 from above the core column sample 6, specifically:
[0096] Install the pressure device above the core column sample:
[0097] The rotating rod 51 is taken out, and the middle part of the upper cover 2 is blocked with a plug 55 for the perforation of the rotating rod 51;
[0098] Install an upper air valve 14 on the upper cover 2;
[0099] Setting the pressure source 54;
[0100] Connect the two ends of the air valve 53 with the upper cavity 11 of the barrel 1 and the pressure source 54 respectively.
[0101] Putting pressure on the core column sample 6 from above the core column sample 6 specifically includes the following steps: start the pressure source 54, pass the nitrogen in the pressure source 54 into the upper cavity 11 of the cylinder body 1 on the top of the piston 52, and pr...
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