钻井风险主要包括井漏风险、井塌风险、井涌风险、卡钻风险。
Drilling risks include the risk of lost circulation, well fall risk, the risk of Wells flow, and sticking risk.
该气田地层裂缝发育，钻井过程中井漏和井塌问题非常严重，钻井作业十分困难。
Very severe problems during drilling were circulation loss and borehole collapse because of formation fracture growing, and drilling operation was very difficult.
钻遇地层复杂，井壁稳定性差，井漏、井涌、井塌、缩径、卡钻等井下复杂情况频发；
Drilled formations are complex with unstable wall. Lost circulation, well kick, borehole collapse, diameter shrinkage, sticking and other complex situations often occur.
二连油田阿南区块，由于长期注水，油气层出现明显的异常高压，地层原始压力遭到破坏，造成了井涌、井塌、井漏等复杂事故。
Abnormal high pressure systems have formed in Anan Block of Erlian oilfield due to long time of water flooding, kicks, lost circulation and hole collapse are frequently encountered.
经现场应用表明，该体系舱有效地解决堂古5井四开井段盐膏层易溶解、易垮塌造成的井壁不稳定问题，满足了堂古5井的钻井施工要求。
The application in the wellsite shows that the new drilling fluid system effectively solves the problems of bore-hole stability and satisfies for the drilling operation of Tanggu 5 well.
2004年新钻的4口裸眼完成井，投产时出现了油层严重垮塌，井下堵塞，油井报废。
The oil layers of four open hole Wells drilled in 2004 occurred serious collapse to result in downhole plugging and oil well fail when oil well put into production.
为解释直径很大的塌井，提出“组合塌井”概念。
For explanation of the col-lapse well with large calibre, a concept of combined collapse well is presented.
为解释直径很大的塌井，提出“组合塌井”概念。
For explanation of the col-lapse well with large calibre, a concept of combined collapse well is presented.
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