天然气勘探与开发2025，Vol.48Issue(4)：98-106,9.DOI:10.12055/gaskk.issn.1673-3177.2025.04.010
川渝地区大斜度井长段低压采空区阻卡防控与安全钻井优化技术
Technologies for sticking prevention and safe drilling optimization of highly deviated wells penetrating long low-pressure depleted zones in Sichuan-Chongqing area
摘要
Abstract
Oil and gas exploration and development in the Sichuan-Chongqing area has extended into deep and ultra-deep horizons,and the upper reservoirs have become depleted due to significant decrease of formation pressure after years of production.When a highly deviated well penetrates a long depleted zone,the combination of long extended well section and low formation pressure coefficient frequently triggers severe lost circulation.This in turn causes downhole problems such as pressure-differential-induced sticking and collapse-induced sticking,prolonging the drilling cycle and raising single well costs.To solve these problems,a comprehensive study was carried out covering drilling fluid property,bottom hole assembly(BHA),borehole cleaning,and fine design and operation.Guided by the philosophy of"potent plugging,minimal contact,efficient cleaning,precise operation,and rapid response",a set of supporting technologies were developed for sticking prevention and safe drilling optimization in depleted zones.Study results show that,(i)"potent plugging"is achieved through optimized drilling-fluid system and properties,and safe operation density;(ii)"minimal contact"is achieved by optimized BHA and timely addition of glass microspheres;(iii)"efficient cleaning"is achieved via variable displacement drilling and high-efficiency circular sand carrying;(iv)"precise operation"is achieved by wellbore trajectory design and control in depleted formations;(v)"rapid response"is achieved through targeted technical measures for lost circulation and pipe sticking;and(vi)the technologies have been successfully applied in 4 wells in high-sulfur gas reservoirs of the northeastern Sichuan Basin and 22 shale-gas well operations in the southern Sichuan Basin.It is concluded that the technologies have efficiently solved the severe lost circulation and pipe sticking problems encountered while drilling highly deviated wells through long low-pressure depleted zones,and thus provide a reference for similar situations.关键词
川渝地区/长井段/大斜度井段/低压储层/采空区/强封堵/少接触/强清洁/快处理Key words
Sichuan-Chongqing area/Long section/Highly deviated section/Low-pressure reservoir/Depleted zone/Potent plugging/Minimal contact/Efficient cleaning/Rapid response分类
能源科技引用本文复制引用
黄彦发,敬婧,唐晓明,唐毅,贺立勤,卓云,黄兵,马骁..川渝地区大斜度井长段低压采空区阻卡防控与安全钻井优化技术[J].天然气勘探与开发,2025,48(4):98-106,9.基金项目
中国石油集团川庆钻探工程有限公司科研项目"川东北高含硫区域安全钻井关键技术与提速技术深化研究"(编号:CQ2024B-5-Z1-3). （编号:CQ2024B-5-Z1-3）
