当井和一个水池相接时，油通常会从井里上升，因为它与井下的水的密度不同，或者因为停留在它上方的膨胀气体的压力。
When the well reaches a pool, oil usually rises up the well because of its density difference with water beneath it or because of the pressure of expanding gas trapped above it.
陕北油石二开井段遇阻的原因为泥岩的水化膨胀和孔隙性砂岩的泥饼沉积。
The drilling resistance of the Erkaijing well in oil field of north Shanxi is caused by hydration expansion of mud stone and mud cake deposition of porous sandstone.
生产封隔器或者测试封隔器可能下入下套管的井段，而膨胀式封隔器可以在裸眼井段使用，也可以在下套管井段使用。
Production or test packers may be set in cased holes and inflatable packers are used in open or cased holes.
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