se to zero, the permeability recovery value is greater than 95%, than the domestic and foreign present temporary plugging and reservoir protection technology of the permeability recovery value increased about 25%, in order to realize reservoir ultra low damage or no damage to lay a theoretical and technical foundation.

⑶The new method for evaluating dynamic leak plugging method of ultra low permeability drilling fluid leak plugging the new technology and the simulated downhole conditions. Field application of plugging a success rate of more than 90%, improving ground bearing capacity than the same kind of technique of high 20-30%, leak plugging effect, basically solve the problem of drilling in long open hole more susceptible to pressure layer when the borehole collapse, leakage, sticking and reservoir damage coexist.

      This achievement has authorized 2 national invention patents, 7 utility model patents, positive real instance 2 national invention patents, published 7 books,