勺形水平井在四川长宁页岩气开发中的应用

发布时间：2019-04-24 07:14

【摘要】：随着四川长宁页岩气进入新的开发阶段,丛式水平井平台正下方储层无法动用的问题突显,目前沿用的常规水平井无法有效应对,严重制约了长宁页岩气的高效开发。勺形水平井是解决该问题的有效方法之一。通过研究勺形水平井的技术原理,基于长宁区块地质情况设计了页岩气勺形水平井,并结合长宁区块第1口勺形水平井——CN-S井的试验情况对勺形水平井的应用进行了分析。分析结果表明:勺形水平井通过产生反向位移将入靶点提前,可使水平段增加300 m左右,可使平台下方死气区面积缩小至30 m×800 m,储层动用面积增加95%;钻井摩阻低(实测下钻摩阻为10~15 k N,起钻摩阻为5~10 k N,油层套管下入摩阻为15~20k N),套管下入顺利,具有技术可行性。实例表明,勺形水平井在长宁页岩气应用是可行的,能有效增加储层动用面积,节约钻井成本,对页岩气的经济高效开发具有重要意义。
[Abstract]:With the new development stage of shale gas in Changning, Sichuan Province, the unavailability of reservoirs directly below the cluster horizontal well platform is highlighted, and the conventional horizontal wells used at present cannot be effectively dealt with, which seriously restricts the efficient development of Changning shale gas. The spoon-shaped horizontal well is one of the effective methods to solve this problem. Based on the geological conditions of Changning block, a shale gas spoon horizontal well is designed by studying the technical principle of dipper horizontal well. The application of the first dipper horizontal well-CN-S in Changning block is analyzed in this paper. The results show that the horizontal well can increase the horizontal section by 300 m, reduce the area of the dead gas area below the platform to 30 m 脳 800 m, and increase the reservoir production area by 95% by producing the reverse displacement of the horizontal well. The drilling friction is low (the actual drilling friction is 10 脳 15 kV, the drilling friction is 5 脳 10 kV) and the casing entry resistance is 15 / 20 k N), which has the technical feasibility. The example shows that the application of spoon-shaped horizontal well in Changning shale gas is feasible, can effectively increase reservoir production area and save drilling cost, which is of great significance to the economic and efficient development of shale gas.
【作者单位】：中国石油西南油气田分公司;
【基金】：国家科技重大专项“长宁—威远页岩气开发示范工程”(2016ZX05062)
【分类号】：TE243;TE37

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