Inversion method of crack parameter

Abstract

The invention discloses an inversion method of fracture parameters, which belongs to the technical field of oil and gas reservoir development. The inversion method has a large convergence area and is less dependent on initial values. The inversion method of the fracture parameters includes: obtaining the ground tilt field data measured by the inclinometer located on the ground; using the simulated annealing method to invert the azimuth and dip angle of the fracture according to the ground tilt field data; The downhole tilt field data obtained by the inclinometer measurement; according to the downhole tilt field data, the azimuth angle and dip angle of the fracture, the length, width and height of the fracture are obtained by inversion using simulated annealing method.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir development, in particular to a fracture parameter inversion method. Background technique [0002] Hydraulic fracturing is the use of surface high-pressure pumps to inject high-viscosity fracturing fluid into oil and gas reservoirs through the wellbore. When the rate of injection of fracturing fluid exceeds the absorption capacity of the formation, a very high pressure is formed at the bottom of the well. When the fluid pressure exceeds the fracture pressure of the formation, the formation is pushed open and fractures with a certain shape are formed at the same time. [0003] One of the currently emerging fracture monitoring techniques is based on inclinometers. This fracture monitoring technology uses a high-sensitivity inclinometer to measure the tilt field changes on the ground and the formation around the monitoring well caused by hydraulic fracturing, and uses the inversion met...

AI Technical Summary

Problems solved by technology

If this method is used for inversion calculation, when the initial value given by the technician is outside the convergence area, the objective function may fall into a local extremum, resulting in the failure of the solution

Although the Bayesian inversion method prevents the possibility of the objective function falling into a local extremum, it needs to pre-estimate the fracture volume and orientation during inversion, and this information cannot be obtained in most cases.

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