Borehole Wall Stability Mechanism Analysis and Evaluation Technology Exploration of Foam Drilling Fluid

During the drilling process of using foam fluid,it's easily to cause borehole wall instability.Even so,the foam drilling fluid with good performance has certain positive effect on the borehole wall stability.At present,there are few means of evaluation towards borehole wall stability of foam drilling fluid.A set of methods were formed on borehole wall stability evaluation through foam drilling fluid inhibition and sealing properties evaluation experiment.This method can provide some technical reference for the borehole wall stability evaluation of foam drilling fluid.Results show that this foam drilling fluid has good inhibition and sealing properties.Formed certain borehole wall stability property by the combination of chemical inhibition and physical sealing.Finally,the mechanism of foam drilling fluid borehole wall stability is expounded.