CAJ | 학술논문

黄36井区长8目的层水平井钻井施工过程中，针对长7油页岩段长、井斜大，长4+5地层承压能力低，钻井液密度达不到平衡油页岩坍塌压力所需要的密度，导致油页岩易垮塌以及PDC钻头滑动困难、造斜段机械钻速低等问题，从单纯通过防漏堵漏提高钻井液密度转变为降低排量提高钻井液密度，同时通过减小油页岩交变应力、控制油页岩段井斜来提高坍塌压力，使用牙轮钻头造斜等方法，降低了坍塌几率，并有效提高了机械钻速。该水平井快速钻井技术能有效解决窄密度窗口的问题，提高施工效率，降低钻井成本。
황36정구장8목적층수평정찬정시공과정중，침대장7유혈암단장、정사대，장4+5지층승압능력저，찬정액밀도체불도평형유혈암담탑압력소수요적밀도，도치유혈암역과탑이급PDC찬두활동곤난、조사단궤계찬속저등문제，종단순통과방루도루제고찬정액밀도전변위강저배량제고찬정액밀도，동시통과감소유혈암교변응력、공제유혈암단정사래제고담탑압력，사용아륜찬두조사등방법，강저료담탑궤솔，병유효제고료궤계찬속。해수평정쾌속찬정기술능유효해결착밀도창구적문제，제고시공효솔，강저찬정성본。
In regard of the problems of easy collapse of oil shale, dififculty in sliding of PDC drill, and low rate of penetration in delfecting segment, due to long length and steep well delfection of Chang 7 oil shale segment, low load bearing capacity of Chang 4+5 stratum, and failure of drilling lfuid density to meet the required density for balancing collapse pressure of oil shale during drilling for horizontal wells of Chang 8 target stratum of Huang 36 Well Area, density is raised by lowering displacement from pure plugging and leakage prevention, and collapse pressure of oil shale segment is improved by lowering alternating stress of oil shale and controlling well delfection of oil shale segment. In addition, the method of delfecting by roller bit is adopted to lower collapse probability and effectively improve rate of penetration. The method effectively solves the problem of narrow-density windows, facilitates guaranteeing drilling safety, improves construction efifciency and lowers drilling cost.