Method of selecting fractured stratum plugging material based on photoelastic experiment method

A technology of plugging materials and experimental methods, which is applied in the field of oil drilling materials, can solve the problems of unclear selection of plugging materials and needs to be further studied, and achieve good repeatability, simple operation, and short experiment time

Active Publication Date: 2020-04-24
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, the current selection of plugging materials is mostly based on the indoor trial and error method, and the research on its internal theoretical basis still needs to be deepened, and the selection method of plugging materials is still unclear

Method used

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  • Method of selecting fractured stratum plugging material based on photoelastic experiment method
  • Method of selecting fractured stratum plugging material based on photoelastic experiment method
  • Method of selecting fractured stratum plugging material based on photoelastic experiment method

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Embodiment 1

[0027] In order to verify the reliability of the present invention, an oil and gas area in the Kuqa piedmont of the Tarim Basin is taken as an example. In this area, high-angle fractures are developed in the reservoir section, and the leakage problem is prominent. Calcium carbonate granules are often used as plugging material on site. Since there are many manufacturers of calcium carbonate granules on site and their shapes are different, it is difficult to choose. Polycarbonate was chosen as the experimental material, which has the advantages of high optical sensitivity and transparency, and low creep at room temperature. Polycarbonate photoelastic material was made into two shapes with roundness of 0.75 and 0.90 respectively. They are respectively recorded as simulated plugging material 1 and simulated plugging material 2. Since the photoelastic material particle size is too small in the photoelastic experiment, the observation effect will be affected. Leakage material 1 and...

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Abstract

The invention relates to the technical field of petroleum drilling materials, and particularly relates to a method of selecting a fractured stratum plugging material based on a photoelastic experimentmethod. According to the method, a photoelastic material is selected to simulate a rigid plugging material, a photoelastic image and a load curve in the loading process of a plugging layer of the plugging material are obtained, and the plugging material is selected with the structural stability of the plugging layer as the judgment basis. According to the method, the reliability is high on the basis of the relationship between the structure and the performance and the particulate matter mechanics theory; internal stress distribution and evolution in the pressure bearing process of the plugging layer can be observed in real time, the instability mechanism of the plugging layer is revealed, and then the plugging material is optimized in a targeted mode; according to the plugging material selection method based on microstructure characterization of the plugging layer, a new thought is porvided for selection of a plugging material of a deep-layer leakage stratum; and the method has good repeatability, and is simple and convenient to operate and low in economic cost.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling materials, in particular to a method for selecting a plugging material for drilling and completion of fractured formations based on a photoelastic experiment method. Background technique [0002] Fractured oil and gas reservoirs are widely distributed and have huge resources, occupying an extremely important position in the world's oil and gas exploration and development. Developed fractures provide the main seepage channels for fractured oil and gas reservoirs, but the existence of fractures will lead to the loss of working fluid. Working fluid loss is the most serious form of reservoir damage, and it is one of the complex engineering problems that affect safe and efficient drilling in the long term. As exploration and development go deeper, reservoir conditions such as high temperature, high pressure, and high geostress further increase the difficulty of working fluid loss control, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/24G01L1/24G01N21/84
CPCG01L1/241G01N3/08G01N3/24G01N21/84G01N2203/0019G01N2203/0025G01N2203/006G01N2203/0246G01N2203/0647G01N2203/0676C09K8/5045E21B21/003G01B11/18E21B33/13G01L1/24
Inventor 许成元闫霄鹏康毅力经浩然张敬逸林冲游利军
Owner SOUTHWEST PETROLEUM UNIV
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