CAJ | 학술논문

随着国内市场对天然气需求量的迅速增长，如何成功开发宁武盆地储量丰富的煤层气资源已成为目前非常规气藏开发的一个重要课题。结合宁武盆地地应力状态、地层孔隙压力、地层强度参数、井斜角和方位角等参数，科学确定适合煤层气井钻进的钻井液密度窗口，成为宁武盆地煤层气项目能够高效、安全实现产业化发展的关键因素之一。通过ANSYS软件对宁武盆地9号煤层建立有限元模型，分别分析了不同地应力方向时不同井斜角钻井液密度对井眼扩大率的影响规律，针对不同方位和井斜得出了适用的钻井液密度窗口，对于下一步宁武盆地煤层气井产业化开发中有效控制煤层坍塌，降低复杂情况，提高钻井效率及提高煤层气开发综合效益提供了技术支撑。
수착국내시장대천연기수구량적신속증장，여하성공개발저무분지저량봉부적매층기자원이성위목전비상규기장개발적일개중요과제。결합저무분지지응력상태、지층공극압력、지층강도삼수、정사각화방위각등삼수，과학학정괄합매층기정찬진적찬정액밀도창구，성위저무분지매층기항목능구고효、안전실현산업화발전적관건인소지일。통과ANSYS연건대저무분지9호매층건립유한원모형，분별분석료불동지응력방향시불동정사각찬정액밀도대정안확대솔적영향규률，침대불동방위화정사득출료괄용적찬정액밀도창구，대우하일보저무분지매층기정산업화개발중유효공제매층담탑，강저복잡정황，제고찬정효솔급제고매층기개발종합효익제공료기술지탱。
With the rapid growth of market demand for natural gas, how to successfully develop the rich CBM reservoir in Ningwu basin becomes an important subject in unconventional gas reservoir development.It is one of the key factors to sci-entifically determine a suitable drilling fluid density window by combining with the crustal stress state, the parameters of formation pore pressure and formation strength, as well as angle of deviation and azimuth angle in order to realize effective and safe coal-bed methane industrialization development in Ningwu basin.The finite element model of No.9 coal seam in Ningwu basin is established by ANSYS software, the influence rule of hole enlargement ratio is analyzed in the conditions of different crustal stress directions and different well inclination, by which the optimized range of mud density is obtained to control coal seam collapse and reduce complex prescription, and the support for research on improvement of drilling effi-ciency and comprehensive benefit of CBM in NingWu basin is found.