苏里格气田水平井随钻地质导向技术及应用

Geosteering technology of horizontal well and its application in Sulige Gas Field

苏里格气田是典型的低渗、低压、低丰度的强非均质性致密岩性气田。水平井开发对于提高单井产量作用显著,然而水平井随钻地质导向难度大是制约其高效开发的瓶颈。针对地质导向过程中微幅构造难判断、井底岩性难识别以及易钻遇泥岩隔夹层等问题,在水平井部署与设计的基础上,通过分析水平段钻遇泥岩时的具体情况,并结合砂体垂向叠置关系及储层内部构型分析,总结了一套适合苏里格气田盒8段气藏的水平段导向调整措施,并以AH井实钻为例加以说明。多年的水平井开发实践表明,采用水平井随钻地质导向技术进行水平井开发,平均砂岩钻遇率达85.7%,平均有效储层钻遇率达62.5%,水平井单井产量是直井的3~5倍。

Sulige Gas Field is a typical tight gas reservoir characterized by low permeability, low pressure, low abundance and strong heterogeneity. Horizontal well development is significant for well production increase. However, horizontal well drilling Geosteering difficulty is the bottleneck restricting the development of efficient technologies. There are problems such as mudstone interlayers, difficulties for judging structure and bottom lithology during the process of drilling geosteering. On the basis of deployment and design of horizontal well technology, by analyzing the specific circumstances of the horizontal section drilling mud, combined with the analysis of vertical stacking sand relations and internal reservoir, this paper summarized a set of adjustment measures of horizontal section guiding suitable for gas reservoirs of He 8 member, and illustrated by taking the actual drilling from AH well as an example. The development of horizontal wells for many years proved that by using geosteering technology for horizontal well development, the average sandstone drilled rate can reach 85.7%, the average effective reservoir drilled rate is 62.5%, and horizontal well production is 3 to 5 times than that of vertical well.