涪陵页岩气田江东区块优快钻井技术研究与应用

Research and application of fast drilling technology in Jiangdong Block of Fuling Shale Gas Field

摘要:

涪陵页岩气田江东区块地质构造复杂、地层倾角大，存在机械钻速低、定向钻井托压严重、水平井轨迹控制困难等问题，给该地区优快钻井作业带来了挑战。本文通过总结现场施工作业及技术攻关实践，分析总结了江东区块复杂地质条件下相适应的钻井新工艺、新工具，形成了一套适用于涪陵页岩气田江东区块的优快钻井技术。江东区块钻井周期从开发前期的235 d缩短至9033 d，机械钻速、储层钻遇率不断提高的同时，定向钻井托压、钻头提前失效等工况逐渐减少。通过4年发展，涪陵页岩气田江东区块优快钻井集成技术逐渐成熟，基本满足了深层页岩气的开发需要。

Abstract:

The Jiangdong Block of the Fuling Shale Gas Field is featured of complex geological structures and large dip angles. Problems such as low mechanical drilling rate, severe drag force and difficult horizontal trajectory control are encountered, which brings drilling problems to the fast drilling operations in this area. By summarizing the field operations and technical problem solving practices, this paper presents a set of fast drilling techniques through analysis of drilling processes, new tools, bit selection and speedincreasing tools suitable for the complicated geological conditions of Jiangdong Block. Comparison of the fast drilling technology with the conventional drilling method at the Jiangdong Block of the Fuling Shale Gas Field shows that the drilling duratiom in Jiangdong Block has been shortened from 235 days to 9033 days in the early stage of development. While the drilling rate and the reservoir intersection rate have been continuously improved, the working conditions such as drag forces, premature bit failures have been gradually reduced. Over three years of development, the fast drilling technology at Jiangdong Block of Fuling Gas Field has gradually matured, and the results have been applied significantly.