METHOD FOR EVALUATING PERFORMANCE OF MULTISTAGE HYDRAULIC JET FRACTURING STRING

摘要

A method for evaluating performance of a multistage hydraulic jet fracturing string. A "stress intensity safety factor" mechanical analysis method is mainly adopted. Before jet fracturing construction, combination, load, stress and deformation analyses on a multistage hydraulic jet fracturing string under "static" and "dynamic" working conditions are performed according to well-completion production technical requirement specifications, mechanical performance of the multistage hydraulic jet fracturing string under various working conditions is accurately evaluated, and thus, suggestions on parameters suitable for jet fracturing pumping of each layer section are put forward, so as to achieve the purposes of evaluating the string safety in one time and guaranteeing the construction safety. The method is suitable for the evaluation on performance of multistage hydraulic jet fracturing fixed (or dragged) strings of a vertical well and a horizontal well, the optimization of string combinations and preferred oil testing fracturing construction design parameters can be guided, and true and effective reference data is provided for underground string performance detection, thereby improving the string stress safety factor, and reducing the occurrence of string accidents.