Method for correcting and predicting static mechanical parameters of rock under oil reservoir confining pressure condition

Abstract

The invention provides a method for correcting and predicting the static mechanical parameters of rock under an oil reservoir confining pressure condition. The method comprises: 1, dividing the typesof rock phases in a target area according to the lithology data of a cored well; 2, establishing the confining pressure correction charts of the rock static mechanical parameters of different rock phases; 3, establishing rock static mechanical parameter prediction charts under different rock phase confining pressure conditions; 4, establishing the relationship chart between an oil reservoir confining pressure and a burying depth; and 5, correcting and predicting the rock static mechanical parameter confining pressure. According to the present invention, with the method, the mechanical parameters of rock are corrected into the oil reservoir confining pressure condition under the atmospheric pressure condition, and the mechanical parameters under the new area geological body confining pressure condition can be accurately predicted, such that the great application prospects can be provided for the selection of the mechanical parameters in oil reservoir well boring, geomechanical problemsand engineering mechanics problems.

Description

technical field [0001] The invention relates to rock mechanics and geomechanics, in particular to a method for correcting and predicting rock static mechanics parameters under confining pressure conditions of oil reservoirs. Background technique [0002] Laboratory testing of rock mechanics parameters is a destructive experiment that consumes rock samples, and the cost is high, especially for triaxial compression experiments under the conditions of relatively deep buried reservoirs (the buried depth is generally greater than 2000m, and the confining pressure is generally above 35Mpa). , higher requirements for experimental equipment and higher costs. Affected by the experimental equipment and experimental costs of rock mechanics parameters, as well as the limitation of the number of cores taken from coring wells, oilfield companies generally only conduct uniaxial compression experiments on a small number of rock samples under atmospheric pressure, and only a small number of ...

AI Technical Summary

Problems solved by technology

However, rock mechanics parameters under atmospheric pressure cannot accurately reflect the confining pressure conditions of reservoirs due to the large differences in confining pressure conditions for the study of geomechanics and engineering mechanics of oil reservoir geological bodies buried several kilometers underground. The characteristics of mechanical properties cause problems that cannot be solved well, or even go astray

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