Deep optimization technology of the casing program and its application in Xihu Sag， East China Sea
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摘要: 东海西湖地区深部地层具有研磨性强，可钻性差，机械钻速低，且存在异常高温高压等特点。通过不断探索、实践井身结构优化技术，形成了东海近几年较为固定的探井井身结构。但表层?444.5 mm井眼再加速遭遇“瓶颈”，常压深井井身结构仍有优化空间。随着东海钻井技术的不断进步及油气资源勘探开发的需求，水平井及大斜度井的数量在不断增多，而开发井?215.9 mm井眼水平段?177.8 mm尾管下入困难。因此，需要进一步对东海西湖凹陷区域井身结构进行深度优化。针对以上难点，研究形成了表层井眼尺寸优化技术、深井井身结构简化技术及开发井尾管尺寸优化技术。现场试验应用表明，钻井提速效果明显，为后续井的井身结构继续优化奠定了基础。同时也降低了深部井段复杂情况出现的概率，增大了探井套管和井眼环空间隙，为后续作业提供了便利，也为复杂地质条件下深井和超深井的井身结构的设计提供了新的思路。Abstract: Deep formations in the Xihu area of East China Sea are characterized by strong abrasiveness， poor drillability， low ROP and abnormal high temperature and pressure. Through continuous exploration and practice of casing program optimization technology， a relatively fixed exploration casing program has been formed for the East China Sea in recent years. However， further increasing of drilling rate for 444.5mm surface hole has encountered a bottleneck， and there is still room for optimization of casing program for atmospheric deep wells. With the continuous progress on drilling technology and the need for oil and gas exploration and development in the East China Sea， the number of highly deviated wells and horizontal wells is increasing， while it is difficult to run 177.8mm liner in 215.9mm horizontal section of the development well. Therefore， it is necessary to further optimize the casing program in Xihu Sag of East China Sea. To overcome these difficulties， the surface hole size optimization technology， the liner size optimization technology of the development well and the casing program simplification technology of the deep well have been studied and formed. The field application indicated that the drilling speed was improved significantly， which lays a foundation for further optimization of the casing program in subsequent wells. It also reduced the probability of complex conditions in the deep well section， increased the annulus clearance of exploration wells between casing and wellbore， and provided convenience for subsequent operation； meanwhile， it can feed new thought for the well structure design of deep and ultra-deep wells under complex geological conditions.
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Key words:
- Xihu Sag /
- casing program /
- deep optimization /
- drilling speed improving
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