天然气工业2025，Vol.45Issue(11)：83-93,11.DOI:10.3787/j.issn.1000-0976.2025.11.007
深层、超深层页岩气井层内W型布井关键技术
Intraformational W-shaped well placement technology for deep and ultra-deep shale gas wells:A case study of the Yang 101 well area in Luzhou Block,Sichuan Basin
杨照娜 1杨成 1李立 1魏胜 1李亚丁 2黎菁 1高智 1唐田1
作者信息
- 1. 中国石油集团川庆钻探工程有限公司地质勘探开发研究院
- 2. 四川页岩气勘探开发有限责任公司
- 折叠
摘要
Abstract
Inter-well frac-hit occurs frequently in the development of deep shale gas in the Silurian Longmaxi Formation in the Luzhou Block,Sichuan Basin.To address this problem,by taking the Yang 101 well area as an example,this paper analyzes the geological and engineering characteristics of the shale gas reservoirs in the lower part of the first submember of the first member of the Silurian Longmaxi Formation(Long1,11).Based on the"well pattern-fracture network"numerical simulation method,the optimization of development technology was comprehensively investigated,forming a intraformational W-shaped well placement technology for shale gas wells.The following results are obtained.First,in the presence of horizontal fractures and low-angle fractures,when the vertical spacing between adjacent well targets within the platform is controlled at 3 to 5 meters,the induced fracture distribution pattern can effectively transform from an"overlapping"to a"stepped"interlaced arrangement.This not only significantly alleviates the interference between wells,but also effectively enhances the employment rate of resources in place.Second,the intraformational W-shaped well placement technology is applicable to Long111 in the study area.The rational well spacing is determined as:300-350 m for the development area of reticular fractures,and 350-400 m for the dominant area of unidirectional fractures.Third,the double-target structure with the Long111 to lower part of Long112 interval as the lower target and the upper part of Long112 as the upper target can effectively address the problem of inter-well interference.Fourth,the optimized phased development mode can effectively prevent malignant frac-hit,thereby reducing the risk of engineering complexity while increasing the EUR of new wells by approximately 9％compared to old wells.In conclusion,the proposed intraformational W-shaped well placement technology is an effective solution to frac-hit in deep and ultra-deep shale gas wells,and it can significantly improve the shale gas development efficiency and has a great engineering guiding significance for the efficient development of shale gas in deep,complex structures.关键词
四川盆地泸州区块/龙马溪组/页岩气/靶体/井间距/层内W型布井/压窜/应力Key words
Luzhou Block/Sichuan Basin/Longmaxi Formation/Shale gas/Target/Well spacing/Intraformational W-shaped well placement/Frac-hit/Stress分类
能源科技引用本文复制引用
杨照娜,杨成,李立,魏胜,李亚丁,黎菁,高智,唐田..深层、超深层页岩气井层内W型布井关键技术[J].天然气工业,2025,45(11):83-93,11.
