Research on damage evaluation method and application of tight reservoir based on pressure oscillation method
Dense reservoirs such as shale gas,coalbed gas and tight gas are characterized by extremely low porosity and permeability and incomplete compliance with Darcy's law in seepage process.Traditional reser-voir damage assessment methods have many limitations in terms of timeliness and accuracy.In order to study the damage evaluation method suitable for tight reservoir,the steady state method,pressure pulse method and pressure oscillation method were compared from the test principle,and pressure oscillation method was select-ed as the best method for damage evaluation of tight reservoirs.Based on the pressure oscillation method,a set of simulation and evaluation equipment for dense reservoir damage with the functions of aggregate working flu-id pollution,permeability test and sensitivity analysis had been developed.Reservoir sensitivity evaluation and damage degree evaluation of working fluid to tight gas reservoirs were carried out for coalbed methane and tight gas reservoirs.Laboratory experiments showed that this method had certain advantages in experimental accura-cy and timeliness.The field application results showed that the optimized working fluid system was well ap-plied in the field.
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