基于钻前风险预测的井身结构优化方法  

Borehole structure optimization based on pre-drill risk assessment

作　　者：胜亚楠 管志川[1] 张国辉[2] 叶浪[1] 刘书杰 冯桓榰 

机构地区：[1]中国石油大学(华东)石油工程学院 [2]中国石油勘探开发研究院工程所 [3]中海油研究总院

出　　处：《石油钻采工艺》2016年第4期415-421,共7页Oil Drilling & Production Technology

基　　金：国家科技重大专项课题"西部山前复杂地层安全快速钻完井技术"(编号:2011ZX05021-001);中海石油(中国)有限公司科研项目"海外BD高温高压高含硫气田水平井钻完井关键技术研究"(编号:YXKY-2015-ZY-12)

摘　　要：考虑钻井工程风险、基于钻前风险预测的井身结构设计是钻井施工安全顺利进行的保证。钻井工程风险在实钻过程中的主要表现是:井漏、井喷、井塌、卡钻以及井下工具失效等问题。首先基于邻井资料求取了待钻目标井含可信度的地层压力剖面,再利用钻井风险评价方法对待钻目标井井身结构设计方案进行评价,在钻前预测出可能发生的工程风险,并基于预测结果优化井身结构设计方案,规避钻井风险的发生。新方法为合理规避工程风险、调整施工方案、安全快速钻井提供了科学的依据,可以有效降低钻井工程风险发生的概率和频度,缩短建井周期,对于安全、高效钻井具有重要意义。Borehole structure design based on pre-drill risk assessment and considering risks related to drilling operation is the pre-condition for safe and smooth drilling operation. Major risks related to drilling operation include lost circulation, blowout, sidewall col-lapsing, sticking and failure of drilling tools etc. In the study, data from neighboring wells was used to calculate the profle of formation pressure with credibility in the target well, then the borehole structure design for the target well was assessed by using the drilling risk assessment to predict engineering risks before the start of drilling, fnally, the prediction results were used to optimize borehole structure design to prevent such drilling risks. The newly-developed technique provides a scientifc basis for lowering probability and frequency of drilling engineering risks, and shortening time required to drill a well, which is of great signifcance for safe and high-effcient drilling.

关 键 词：井身结构优化 钻井风险 可信度 压力不确定性 

分 类 号：TE21[石油与天然气工程—油气井工程]