RESEARCH AND APPLICATION OF IMPROVING POSTFRACTURE RESPONSE IN HUBUZAI GASFIELD

Reservoir of Hubuzai gasfield has some characteristics,such as:poorer physical property,lower porosity,lower permeability and low pressure etc.,so that fracture treatment is difficult to perform .Therefore,the resarch on reservoir damage mechanism of fracture treatment in Hubuzai gasfield and reservoir protection technology is carried out.Optimization of the lower damage fracture fluid and analysis of geologic parameter have increased the accuracy of fracturing design parameters and eliminated the formation damage.New fracturing technology requires adding proppant slug into pad fluid and applying staged gel breaking technique,fracture processing technique and forced closure technique in fracturing operation,the fracturing success ratio and postfracture response is increased.Result of field tests in 4 wells indicates new technology has been increasing gas production per well to 2 475×10 4 m 3/d and cumulative stimulation ratio has been reached to 457×10 4 m 3