深水浅层钻井液安全密度窗口研究  

Study on the safety window of drilling fluid density for shallow formations in deep water drilling operations

作　　者：邓嵩[1,2] 樊洪海[2] 牛军[2] 任威严 刘玉含[2] 刁皓玉 祝兆鹏 

机构地区：[1]常州大学石油工程学院,江苏常州213002 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249

出　　处：《中国海上油气》2017年第4期138-144,共7页China Offshore Oil and Gas

基　　金：国家自然科学创新研究群体项目"复杂油气井钻井与完井基础研究(编号:51221003)";国家自然科学基金"深水钻井隔水管-导(套)管力学特性研究与水下井口稳定性分析(编号:51574261)";"十二五"国家科技重大专项"钻井工程设计和工艺软件(编号:2011ZX05021-006)"部分研究成果

摘　　要：深水浅层钻井液安全密度窗口窄,给深水浅层钻井设计和工程安全带来极大挑战。根据深水浅层地层特征,运用四参数流变模型进行了波动压力计算,在此基础上考虑深水浅层隔水管安全余量和浅层地质灾害安全余量建立了深水浅层钻井液安全密度窗口确定方法。以我国南海莺琼盆地YC1井为例,计算分析了深水浅层钻井液安全密度窗口变化规律,结果表明隔水管安全余量、浅层安全余量对深水浅层钻井液安全密度窗口影响较大。根据上述结果,提出了利用双梯度钻井技术(DGD)解决钻井液安全密度窗口窄的方法,可为深水钻井设计提供参考。The narrow safety window of drilling fluid density brings great challenges to the drilling design and project safety for drilling in shallow formations in deep water fields. Based on the characteristics of the formations, a four-parameter rheological model was applied to compute the surge pressure. With the consideration of the safety margins of both the riser and geological hazards of shallow formations, a method for determining the safety window of drilling fluid density were proposed. Taking Well YC1 in Yingqiong basin in South China Sea as an example, the safety window in this scenario was computed, and the variation pattern thereof was analyzed. The results indicated that safety margins of both the riser and shallow formations have a greater influence on the safety window. On the basis of the findings above, a method which uses DGD to solve the problem：the narrow window of drilling fluid density was proposed, which would give reference for deep water drilling design.

关 键 词：深水浅层 钻井液安全密度窗口 波动压力 隔水管安全余量 浅层安全余量 莺琼盆地 

分 类 号：TE254[石油与天然气工程—油气井工程]