A rock-like material for simulating reservoir rock heterogeneity and preparation method of specimen

A technology of heterogeneity and rock materials, which is applied in the preparation of test samples, the application of stable tension/pressure to test the strength of materials, and the analysis of materials, etc. It can solve problems such as artificial disturbance, structural surface damage, and complex conditions. Achieve the effect of meeting the test accuracy requirements, simple production and simple method

Active Publication Date: 2021-07-13
SHANDONG UNIV
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AI Technical Summary

Problems solved by technology

[0007] (1) Since the general reservoir rocks have undergone long-term geological tectonic action and the conditions are complex, the crystal particle size inside the original rock cannot be artificially controlled and sampling is difficult
On the other hand, defects such as primary fractures and joints in the reservoir rock will have an impact on the hydraulic fracturing test results of the reservoir rock.
[0008] (2) When studying the influence of reservoir rock joints, natural fractures and other factors on hydraulic fracturing tests, due to the complex structure of natural rock mass and various structural surface shapes, it is necessary to collect natural rock mass specimens containing joints, natural cracks, etc. Very difficult and susceptible to damage to structural surfaces due to artificial disturbance
However, the specimens processed by manpower into structures including joints or prefabricated cracks are not only complicated in workmanship, but also difficult to meet the accuracy requirements of the test.
[0009] (3) The hydraulic fracturing test based on the original rock is difficult to monitor the mechanical response of the rock during the fracturing process, which limits the analysis and research on the crack propagation mechanism, and the test results based on real rock samples are difficult to repeat, which limits the Study on the damage pattern of the specimen under the influence of different factors
[0010] (4) Reservoir rocks are highly heterogeneous, which has a great impact on hydraulic fracturing and other experimental research, and is not a homogeneous form as considered by traditional rock-like materials research
The rock-like specimens prepared so far have not considered the influence of reservoir rock heterogeneity, and there is a lack of clear standards to characterize the degree of heterogeneity of rock-like materials
[0011] To sum up, the existing rock-like materials cannot truly reflect the differences in the heterogeneity of reservoir rocks in actual hydraulic fracturing engineering. How to accurately and conveniently prepare rock-like specimens that can reflect the actual rock heterogeneity has become an important and urgent issue. Research topics that need to be solved urgently

Method used

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  • A rock-like material for simulating reservoir rock heterogeneity and preparation method of specimen
  • A rock-like material for simulating reservoir rock heterogeneity and preparation method of specimen
  • A rock-like material for simulating reservoir rock heterogeneity and preparation method of specimen

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preparation example Construction

[0039] A rock-like material for simulating reservoir rock heterogeneity and a preparation method thereof, comprising the following steps:

[0040] Step 1: Measurement of reservoir rock heterogeneity, particle size distribution and mechanical parameters;

[0041] Collect sandstone and other common reservoir rock samples, first test the particle size distribution and heterogeneity of the processed samples through high-pressure mercury intrusion test, and test the mechanical parameters of sandstone and other reservoir rock samples through corresponding physical tests , and then combined with the research data of numerical simulation, select a representative particle size interval to qualitatively simulate the heterogeneity characteristics of reservoir rocks. The main mechanical parameters measured include uniaxial compressive strength, tensile strength, elastic modulus, Poisson's ratio, etc., and combined with the description of the main mechanical parameters of the reservoir roc...

Embodiment 1

[0056] This example explains the preparation steps of a rock-like specimen with a moderate degree of heterogeneity. like figure 1 As shown, a method for preparing a rock-like material simulating the heterogeneity of hydraulic fracturing reservoir rocks, the method comprises the steps of:

[0057] Step 1: Measurement of reservoir rock heterogeneity, particle size distribution and mechanical parameters;

[0058] Collect commonly used samples of sandstone and other reservoir rocks, first test the particle size distribution and heterogeneity of sandstone and other samples through high-pressure mercury injection test, and then measure their uniaxial compressive strength, tensile strength and so on through relevant physical tests. Strength, elastic modulus, Poisson's ratio and other main mechanical parameters. Finally, combined with the description of the main mechanical parameters of reservoir rocks in Wang Weiming - "Rock Mechanics", Liang Tiancheng - "Multistage Circulating Pum...

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Abstract

The invention relates to a rock-like material for simulating reservoir rock heterogeneity and a method for preparing a test piece, belonging to the field of rock-like material preparation. Including: measuring reservoir rock heterogeneity, particle size distribution and mechanical parameters; analyzing the influence of particle size ratio on reservoir rock heterogeneity and the sensitivity of mechanical parameters of rock-like materials. Quartz sand particles The particle size is used as an index, and the gradation model and mathematical relationship curve of rock-like materials with different degrees of heterogeneity under the condition of different particle size ratios are established; Schematic diagram of aggregate particle size distribution of rock specimens, select quartz sand particles of corresponding particle size for aggregate proportioning; use quartz sand particles as aggregates to prepare rock-like specimens, cure and demould, and the product is ready. The heterogeneous rock-like material of the invention can better reflect the control effect of particle size on rock heterogeneity, and can more accurately describe the heterogeneity characteristics of complex lithology formations.

Description

technical field [0001] The invention belongs to the field of preparation of rock-like materials, and in particular relates to a rock-like material for simulating reservoir rock heterogeneity and a method for preparing a test piece. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Through the observation of the fracture system formed by the tectonic activities of tight reservoir rocks and many phenomena such as topography, landform, and geological structure, as well as the research on the correlation between neotectonic activities and oil and gas accumulation, it is shown that the heterogeneity of reservoir rocks is the cause of rock formation. One of the main reasons for t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/12G01N1/38G01N1/36G01N1/28
CPCG01N1/286G01N1/36G01N1/38G01N3/12G01N2001/366G01N2203/0017G01N2203/0019G01N2203/0048G01N2203/0252
Inventor 段抗王路超张强勇姜日华李雪剑周新宇
Owner SHANDONG UNIV
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