“硬关井”水击压力计算及其应用

Calculation and Application of Suger Pressure for“Hard Closing”

根据气侵后环空气液两相流分布特点及水击压力在气液两相流及单相流中传播特点，计算了“硬关井”情况下的水击压力变化情况。研究表明：对于气侵情况，硬关井引起的水击压力对井眼中下部影响很小，主要作用于井口装置；如果并口流速不太大，可以采用硬关并，以便减少地层流体进一步侵入。

Based on the two-phase gas-liquid fluid patterns after gas kick in annulus and the propagation of water hammer in the two-phase gasliquid fluid and mud along the wellbore,the propagations of water hammer were calculated for hard shut-in. For gas kick,this analysis shows that pressure pulse amplitude generated due to water hammer is large in the surface casing and small in the well-bore.If the mud or gas liquid mixture velocity is not too large to damage hop, hard shutin should be recommended to avoid the ...