According to oil and gas reserve layer character , mineral
component of Zhongyuan Oilfield , latency damage factors to deep
oil and gas layer were analyzed. Protected deep2seated gas
drilling fluid and completion fluid was studied. This drilling fluid
has lower filtrate , higher inhibition , stability high temperature
and high pressure character , and reduce filtrate tensile force
between filterer and layer gas , and depress water locking effect
and water sensitivity effect , and reduce damage of drilling fluid to
reserve layer. It has high infiltration ratio recovery value and low
cost.
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