页岩气水平井轨迹调控技术及方法--以四川盆地W区五峰组-龙马溪组为例  

Technologies to control shale-gas horizontal-well trajectory:An example from Wufeng Formation-Longmaxi Formation,W block,Sichuan Basin

作　　者：朱红涛 ZHU Hongtao(Southwest Logging Branch,SINOPEC Jingwei Co.,Ltd.,Mianyang,Sichuan 621000,China)

机构地区：[1]中国石化经纬有限公司西南录井分公司,四川绵阳621000

出　　处：《天然气技术与经济》2021年第2期39-45,共7页Natural Gas Technology and Economy

摘　　要：为了提高页岩气井水平段优质储层钻遇率,以四川盆地W区上奥陶统五峰组—下志留统龙马溪组页岩气水平井轨迹调控为研究对象,分析总结并形成了一套包含着陆段A靶预测及轨迹分段调控、轨迹相对储集层空间位置判断、水平段复杂构造轨迹调控等的技术方法。研究结果表明:①通过小层精准定位及判别技术能够准确识别、判断出钻头与储层空间位置的距离及动态变化情况;②通过井轨迹的分段调控技术能够对轨迹进行有效的动态调控,是成功着陆、中取A靶的关键;③运用轨迹相对储层空间位置分析判断与调控技术方法能够及时发现钻头与储层空间位置的动态变化和偏离情况,从而可以实时对水平段轨迹进行优化调控;④通过对复杂构造形态及类型的识别、判断技术的运用,在复杂构造区块页岩气水平井导向中能够提高优质储层钻遇率。结论认为,运用所形成的页岩气水平井轨迹调控技术方法后,W区五峰组—龙马溪组页岩气水平井优质储层钻遇率提高,特别是对复杂构造区块井的轨迹优化调控力度加强。At present,the development of shale-gas horizontal wells in China is gradually increasing.So,in order to effi⁃ciently develop the quality reservoirs in shale-gas horizontal wells and improve the drilling rate,to control the well trajecto⁃ry in Wufeng Formation-Longmaxi Formation,W Block,Sichuan Basin,was analyzed.And a set of control technologies were developed,including the target A prediction and segmented well-trajectory control in landing section,the determina⁃tion of the relative spatial position of the trajectory to the reservoir,and the trajectory control of horizontal section in com⁃plex structures.After these technologies were applied to the Wufeng Formation-Longmaxi Formation in the shale-gas hori⁃zontal wells,the drilling rate in quality reservoirs was improved,especially trajectory optimization control in complex struc⁃tural blocks was strengthened.Results show that(1)the application of the precise sublayer positioning and distinguishing technology can accurately determine and judge the distance between bit and reservoirs and their dynamic variation;(2)the adoption of the segmented trajectory technology can ensure effectively dynamic control and is also the key to successful landing and target A hitting;(3)by virtue of the relative spatial position analysis along with the control technologies,the dynamic variation of both bit and reservoirs and their deviation can be figured out in time,so that the trajectory in horizon⁃tal section can be optimized and controlled in real time;and(4)after the application of the recognition and judging tech⁃nology to some complex structural morphology,the drilling rate of quality reservoirs can be effectively improved under hori⁃zontal-well geosteer in complex structural blocks.

关 键 词：页岩气水平井 优质储集层钻遇率 小层精准定位 轨迹分段调控 钻头位置判断 复杂构造识别 

分 类 号：TE21[石油与天然气工程—油气井工程]