Practice proved that adding chemicals not only decreases the viscosity of crude but also the back pressure of well head decreased.
实践证明，掺污水加药既可以降低原油粘度，又可以有效地降低井口回压。
For high well head pressure, the operation of conventional adding sand fracture treatment tech can not fulfilled.
由于施工井口压力高，常规加砂压裂工艺无法实施作业。
Analysis result of high productivity gas Wells in Luojiazhai shows temperature effect of well bore as the key factor affecting well head pressure.
罗家寨高产气井测试分析结果认为井筒的温度效应是影响井口压力的关键因素。
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