Rock strength parameter testing method based on rock debris nano-micron indentation experiment

Abstract

The invention relates to a rock strength parameter testing method based on a rock debris nano-micron indentation experiment, and belongs to the technical field of oil exploration and development. According to the rock strength parameter testing method based on the rock debris nano-micron indentation experiment, the rock debris nano-micron indentation experiment is carried out, and an indentation load-depth curve under the nano-micron scale is obtained; the triangular pyramid Berkov indentation hardness, the rectangular pyramid cubic corner indentation hardness, the internal friction angle, the cohesive force, the uniaxial strength and the tensile strength of the rock are obtained, and prediction of rock strength parameters is achieved. The rock debris nanometer or micrometer press-in experiment is carried out, a press-in load-depth curve under the nanometer or micrometer scale is obtained, the relationship among the hardness, the internal friction angle, the cohesive force, the uniaxial strength and the tensile strength of the rock is obtained through calculation, and prediction of rock strength parameters is achieved. Basic parameter basis can be provided for oil and gas well drilling, well completion and hydraulic fracturing, and well drilling, well completion and hydraulic fracturing design and construction can be effectively guided.

Description

technical field [0001] The invention relates to a method for testing rock strength parameters based on cuttings nano-micron intrusion experiments, belonging to the technical field of petroleum exploration and development. Background technique [0002] In the process of oil and gas exploration and development, the mechanical properties of reservoir rock are the key factors affecting the safe, efficient and economical extraction of oil and gas. The whole process of exploration and development requires the mastery of rock mechanical properties and distribution rules: cohesion, internal friction angle, uniaxial strength, and tensile strength are important strength parameters that characterize the compressive and shear strength of rocks, and are also important parameters for wellbore stability analysis, drill bit The important basic parameters of type selection, fracability evaluation, and hydraulic fracturing design play an important role in the prevention of downhole complex ac...

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Problems solved by technology

However, for reservoir rocks, affected by mineral components, tectonic stress, formation pressure, and various micro-fractures, the dispersion of formation rock cohesion and internal friction angle is relatively high, which brings great difficulties to logging interpretation. Moreover, the previous logging interpretation seldom considered the nonlinear transformation of the shear fracture curve in the rock triaxial test, and the obtained parameters could hardly reflect the actual mechanical characteristics of the rock; in addition, although the through-bit logging technology can take into account the cable and transmission The advantages of well logging, but it is still in the research and development stage in China, and has not yet been popularized and applied

[0006] Therefore, it is not difficult to see that the petroleum industry has developed a series of rock mechanical property characterization methods based on uniform continuum mechanics, such as laboratory experiments and logging methods; It is still difficult to obtain strength parameters such as cohesion, internal friction angle, uniaxial strength, and tensile strength, especially the rock mechanics parameter profile that meets engineering requirements.

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