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塔里木轮南地区碳酸盐岩裂缝性油气藏地层压力系数与地层破裂压力系数相近，钻井液安全密度窗口小于循环压耗，钻井过程中井漏和溢流经常同时发生，无法进行正常钻进和起下钻作业。针对喷漏共存以及碳酸盐岩不能实现稳产等难题，通过对解放１２８水平井和轮古２大斜度井的欠平衡钻井实践，总结分析了水平井、大斜度井欠平衡钻井的准备及其相关钻井技术。采用了环空打一个重“泥浆帽”，关井，钻具内用清水作为冷却液边漏边钻，顺利地完成了一口造斜点５０６０ｍ，斜深５７５０．３０ｍ（垂深５３４１．７３ｍ），水平段长２５９．４７ｍ的水平井；使用边喷边钻钻井工艺，成功地钻成了一口造斜点５１０２ｍ，斜深５５００ｍ（垂深５３６８．１３ｍ），水平位移２７７．２ｍ的大斜度井（井斜６６°）。利用“吊罐”起下钻技术，解决了井漏情况下的换钻头、测斜、中测、电测、完井等作业。
The formation pressure coefficient of carbonate fractured reservoirs in Lunnan area of Tarim Basin is similar to that of formation fracture pressure. The window of safe density of drilling fluid is less than the cycle pressure loss, and the well leakage and overflow often occur at the same time during the drilling process. Drill homework. In view of the coexistence of spouting and leakage and the difficulty of stable production of carbonate rocks, the preparation of horizontal well and high-deviated well for underbalanced drilling are summarized and analyzed through the underbalanced drilling practice of 128 horizontal well and 2 ancient well. And its related drilling technology. Using the annulus to play a heavy “mud cap”, shut-in, drill with water as the coolant side edge drilling, successfully completed a forge point 5060m, oblique depth 5750.30m (vertical depth 5341.73m) , The horizontal section of 259.47m long horizontal well; the use of side edge drilling drilling technology, successfully drilled into a 5102m incline, oblique depth 5500m (vertical depth 5368.13m), the horizontal displacement of 277.2m of the large gradient Well (deviation 66 °). The use of “hanging pot” from drilling technology to solve the situation under the bit for drilling, inclinometer, measuring, electrical measurement, completion and other operations.