Stratum rupture pressure prediction method

Abstract

The invention provides a stratum rupture pressure prediction method. The stratum rupture pressure prediction method comprises steps of obtaining a transverse wave curve of a stratum at a single well through earthquake between single wells in a work area; obtaining an elastic parameter of the single well according to the transverse wave curve; obtaining overlaying rock pressure, the stratum formation pore pressure and rock tension resistance strength of the stratum at the single well; obtaining a tectonic stress coefficient of the single well through a fracture micro-earthquake; obtaining the stratum rupture pressure of the stratum at the single well according to the tectonic stress coefficient, the overlaying rock stratum pressure, the stratum pore pressure and the rock tension resistance strength; performing pre-stack elastic parameter inversion on the work area to obtain the elastic parameter of the work area by using the elastic parameter of the stratum of the single well as a constraint condition; and fitting the stratum rupture pressure of the stratum at the single well and the elastic parameter of the work area to obtain the stratum rupture pressure of the work area. The stratum rupture pressure prediction method can improve the prediction accuracy of the stratum rupture pressure.

Description

technical field [0001] The present application relates to the technical field of oil and gas field development, in particular to a method for predicting formation fracture pressure. Background technique [0002] The formation exposed in the well will rupture the formation when the pressure reaches a certain limit. This pressure limit is called the formation fracture pressure. Formation fracture pressure is one of the basic parameters required for drilling and hydraulic fracturing design. Accurate prediction of formation fracture pressure is of great significance for preventing drilling accidents, reducing drilling costs and ensuring successful fracturing. [0003] In conventional reservoir oil drilling engineering, the prediction of formation fracture pressure during the drilling stage can provide formation pressure basis for balanced pressure difference drilling, so as to reasonably select the drilling mud density, prevent blowout and leakage, reduce the occurrence of drill...

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Problems solved by technology

However, traditional logging methods do not measure shear waves, but generally use empirical formulas or models to make indirect predictions. Therefore, the accuracy of shear wave information obtained in this way is not high, which will eventually affect the prediction of formation fracture pressure, that is, easily affect the formation fracture pressure. the accuracy of

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