Optimal and Fast Drilling Technologies for Stereoscopic Development of the Fuling Shale Gas Field
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摘要:
为了进一步提高涪陵页岩气田的采收率，首次探索实践了下部小层加密、中部小层评价和上部地层开发的立体开发技术，但钻井过程中面临压力系统多变、压裂干扰严重、防碰绕障难度大和精准导向及钻井提速挑战多等难题。为此，开展了立体开发井组工程设计、钻井提速、基于随钻前探的轨迹控制、页岩低成本高性能钻井液及页岩气井长效密封固井技术研究，形成了以涪陵页岩气田立体开发优快钻井技术。涪陵页岩气田185口井应用了该技术，与应用该技术前相比，机械钻速提高25.5%，钻井周期降低27.8%。涪陵页岩气田立体开发优快钻井技术对国内其他区块页岩油气勘探开发具有借鉴和指导作用。
Abstract:In order to further improve the recovery of the Fuling Shale Gas Field, stereoscopic development technologies, i.e. infill drilling in lower layers, appraising middle layers, and developing upper layers, were first studied and practiced. However, many problems were encountered during drilling, such as pressure system changing, serious fracturing interference, difficult anti-collision and obstacle bypassing, and the challenge of precise steering control and rate of penetration(ROP) increase. Therefore, researches on the engineering design of stereoscopic well group development, ROP increase, trajectory control based on logging while drilling(LWD), low-cost and high-performance shale drilling fluids, and long-term sealing and cementing technologies for shale gas wells were carried out, and the optimal and fast drilling technologies for stereoscopic development of the Fuling Shale Gas Field was developed, which was successfully applied in 185 wells in the field. Compared with previous wells, the ROP was increased by 25.5%, and the drilling duration was reduced by 27.8%. The optimal and fast drilling technologies for the stereoscopic development of the Fuling Shale Gas Field can serve as reference and instruction to the exploration and development of shale in other blocks in China.
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