一旦到达油层，石油就会由于地下巨大压力涌到地面上来，这种巨大压力来自地下天然气或水。
Once we get down to the oil, it usually flows to surface because great pressure, either from gas or water, is pushing it.
且常发生井漏、气侵、坍塌性卡钻、井涌与井喷等井下复杂问题，导致机械钻速低与钻井事故频发。
Low penetration as well as drilling incidents of high frequency resulted from problems caused by leakage, gas migration, collapsing sticking, well kick, blowout and so forth.
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