Study and Application of Formation Water Production and Borehole Wall Stability Prediction Technologies in Daqing Gas/Foam Drilling

The practices have shown that the premise for successful implementation of gas drilling is stable borehole wall, formation containing less water or no water, not high pressure formation and clear reservoir bed relation, etc. Therefore, accurately evaluating borehole wall stability, predicting formation water production and selecting reasonable well intervals for gas drilling to effectively prevent occurrence of complex conditions such as blocking, sticking and fracture of drilling tools, etc. caused by formation water production and borehole wall instability are the keys for success of gas drilling.