CAJ | 학술논문

经过三压力研究和实钻邻区资料证实渤海油田某区块中深部地层存在高温高压。在该区块某探井实际钻探中，地层压力系数1.3，最高达1.65，井底温度高达178℃，根据地层压力及地质特征进行井身结构优化，?444.5 mm 大尺寸井眼钻进至馆陶组顶部垂深2700 m，才能减轻中深部高温高压地层的钻探风险，在渤海地区，?444.5 mm 大尺寸井眼钻进至2700 m 尚属首次，通过钻具组合优化与轨迹控制、海水/膨润土浆钻进、优化水泥浆体系和浆柱结构等技术，使得该井大尺寸井眼钻探过程中，在防斜打快、钻井液工艺及固井技术等方面均取得了突破，为钻开高温高压井段，进行地质评价提供了有力保障。
경과삼압력연구화실찬린구자료증실발해유전모구괴중심부지층존재고온고압。재해구괴모탐정실제찬탐중，지층압력계수1.3，최고체1.65，정저온도고체178℃，근거지층압력급지질특정진행정신결구우화，?444.5 mm 대척촌정안찬진지관도조정부수심2700 m，재능감경중심부고온고압지층적찬탐풍험，재발해지구，?444.5 mm 대척촌정안찬진지2700 m 상속수차，통과찬구조합우화여궤적공제、해수/팽윤토장찬진、우화수니장체계화장주결구등기술，사득해정대척촌정안찬탐과정중，재방사타쾌、찬정액공예급고정기술등방면균취득료돌파，위찬개고온고압정단，진행지질평개제공료유력보장。
3D pressure study and the data of drilled wells in vicinity prove that there is high temperature and high pressure in the middle and deep formations in some block of Bohai Oilfield. While drilling some exploration well in this block, the formation pressure coefficient was 1.3, max. 1.65, and bottom temperature was up to 178 ℃. The wellbore configuration was optimized based on formation pressure and geologic features. When the ?444.5 mm large hole was drilled to the top of Guantao Formation with a vertical depth of 2 700 m, the risk in drilling of HTHP formation in the middle and deep formations could be mitigated. In Bohai area, it was the first time that ?444.5 mm hole was drilled to 2 700 m. Through technologies like BHA optimization and trajectory control, drilling with seawater/bentonite fluid, optimized cement slurry system and fluid column structure, etc., breakthroughs were made in deviation control and fast drilling, drilling fluid technology and cementing technology while drilling this large size hole, which provides guarantee for drilling into the HTHP section and for conducting geologic assessment.