各向异性岩体中利用测井资料反演地应力的方法
摘要:地应力场分析在钻井工程中具有重要意义,现代声、电扫描测井技术通过提取井下人工诱导裂缝信息为地应力反演提供了新的技术手段。钻井工程常遇含层理、结构面的岩体,而常规井壁崩落法反演地应力将岩体假设为各向同性与实际情况不符。为考虑井壁围岩的各向异性特征,引入层理弱化面概念建立了利用片壁坍塌崩落资料预测最大水平主应力的模型。计算结果表明:岩体中软弱面方位对井壁坍塌裂缝的位置和规模产生重要影响;随着大小水平主应力比值的增大,井壁坍塌区域产状及位置会发生规律性地变化;通过测井资料提取坍塌裂缝产状及位置信息可较为精确地限定水平最大主应力的取值区间。
Abstract:Knowledge of the in-situ stress underground is of crucial importance for drilling and reservoir development,the widespread use of wellbore imaging devices made it possible to interpret the local stress state more complete and economical.Breakout azimuths revealed by well logs are widely used to determine principle stress directions in traditional method,however strength anisotropic related to bedding planes may affect both breakout azimuths and widths.which can result in misleading in-situ stress interpretations.Based on weak-plane failure model,we analyzed the relationship between in-situ stress and breakout geometry(azimuth,width and depth).The results show that breakout azimuths are controlled by weak planes' azimuths,while steeply dipping bedding planes widen the breakout and make it deeper.For determined strata property,breakout geometry will change regularly with the increase of the principal stress ratio.A breakout observed in well WFSD-2 help introduce the method for constraining the maximum horizontal principle stress.
中文标题：
各向异性岩体中利用测井资料反演地应力的方法
Constraining the In-situ Stress in Anisotropic Rocks from Observations of Drilling-Induced Borehole Failures
作者：
丁立钦,王志乔,王瑜
Ding Liqin,Wang Zhiqiao,Wang Yu
作者简介:丁立钦,男,1990年生,山东寿光人,在读硕士研究生,主要从事岩石力学方面的研究。E-mail:dlq891@163.com
通讯地址：
中国地质大学(北京), 北京 100083
ChinaUniversityofGeosciences,Beijing100083,China
中图分类号:TU443
doi:10.3969/j.issn.1007-2993.2016.05.011
出版物：岩土工程技术
收稿日期:2016-06-16
关键词:测井,各向异性,弱面,井壁坍塌,地应力反演
Key words:well logs,anisotropy,weak plane,wellbore breakout,in-situ stress
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基金项目：
基金项目: 国家自然科学基金项目(11472249,41572360)
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