Electrical behavior, inhibition, wall stability and reservoir protection;

The modified positive polyglycols anti-sloughing agent was developed by cationic reaction and metal salt catalytic degradation and it presented favorable inhibition and slight viscosifying negative effect.

The laboratory experiment results show that the optimal formulation have good rheology,inhibition,high tolerance to contaminations.

The characteristics, bore hole stabilization mechanism, composition and the use of the mud additives, the evaluation of the shale inhibitive capacity, and the field application of the HPWBM will be discussed in this .

An evaluation procedure was required to understand the inhibitive capacity of the inhibitor used.

Based on optimizing of frequently used polymers,the orthogonal test method has been adopted to determine the recipe of solid free polymer drilling fluid with strong rejection capability,mainly polyvinyl alcohol(PVA) and compound of inorganic and organic polymers,which can be applied to practical production.

The results of soak test,shale expansion test and shale's rolled recovery showed the good rejection capability and anti-collapsing.

Associative item“Research on strong rejection capability of solid free polymeric drilling fluid system”of the Geology Reconnaissance Station (in short of“GRS”), Jilin province, the purpose of this paper is to triturate dril.

Results showed that NM drilling fluid presented excellent rheology,high inhibitive,well l.

The system has stable performance,good inhibitive,sticking prevention and hole sloughing prevention,and can meet the requirement of drilling operation.

Through drilling fluid performance test and rolling recovery test,the paper evaluates the performance of polymer fluid loss additive with compound lon,discusses the relation of molecular structure with fluid loss result and inhibitive at ordinary temperature.