国外现代油气井设计的一些新进展.docx

第41卷第1期 2013年1月Vol.41 No. I Jan.,2013石 油 第41卷第1期 2013年1月 Vol.41 No. I Jan.,2013 PETROLEUM DRILLING TECHNIQUES 专家视点 doi:10.3969/j.issn.1001-0890.2013.01.001 国外现代油气井设计的一些新进展 李自俊 (长江大学石油工程学院，湖北荆州434023) 摘 要：现行油气井设计方法20多年前从国外引进并沿用至今，虽已较为成熟，也基本能满足一般工作需要， 但20多年间国外在该方面又取得了一些进展，值得学习、借鉴。通过调研、分析和对比，认为国外油气井设计在近 20多年主要取得了如下发展：运用数学方法，从检测到的数据中找出规律，提高压力预测的精度；根据地质力学理 论，着眼于井眼稳定，应用中线原理设计全井钻井液密度，能有效保持井眼稳定；以动态控制溢流的观点，按照允许 的最大溢流量准则，正确选择各层套管柱的下入深度，能满足不同条件下的井完整性要求；全面考虑比较设计井工 作期间各层套管柱的受力情况，选择确定最为现实的设计条件并考虑多种因素的影响，进行套管柱的强度设计，可 以做到比较符合设计井的实际情况。该系列新进展使现代油气井设计更为科学，更符合实际，也更安全。研究内 容对国内油气井设计具有一定的借鉴价值和指导意义。 关键词：钻井设计压力预测井眼稳定钻井液密度套管柱设计溢流 中图分类号：TE22 文献标识码：A 文章编号：1001-0890(2013)01-0001-07 New Overseas Methodology of Modern Well Design Li Zijun (Petroleum Engineering College,Yangtze University,Jingzhou,Hubei,434023,China) Abstract: The prevailing well design methodology in China was imported more than twenty years ago. It has been proven to be a mature method applicable to conventional projects. In past years,this methodolo- gy further evolved in its source countries. Through investigation,analysis and comparison,we find that the overseas well design methodology is advanced additionally in following aspects:(1)extensive use of math- ematic models in data mining allows more accurate prediction of pressure;(2)the borehole stability can be effectively maintained using median line principle to design mud weight according to geomechanical theory; (3)setting depth of casing strings is correctly selected based on maximum allowable spill under the princi- ple of dynamic spill control, which can ensure the well integrity in different environments;(4)by comparing the loads on casing strings in the operation of well, the most realistic conditions and several other factors are considered in strength design of casing strings.