New Overseas Methodology of Modern Well Design
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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。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 methodology 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 mathematic 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 principle 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.These trends suggest that modern well design is more scientific,more practical,and safer.This will be valuable and referential for well design in China.
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Keywords:
- drilling design /
- pressure prediction /
- hole stabilization /
- drilling fluid density /
- casing string design /
- spill
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