摘要
水力压裂的地破试验是测量深部原位地应力的有效方法,从完整地破试验曲线可以解释出地应力,但现场地破试验大多得到非完整地破试验曲线,无法从中解释出地应力。利用弹性力学方法,提出了裂缝扩展压力与两个水平主应力的关系,结合裂缝起裂压力与两个水平主应力的关系进行地应力解释。琼002井4 340 m处地应力解释结果表明:由非完整压裂曲线解释地应力方法与传统解释方法得到的最大地应力相差0.53%,最小地应力相差0.15%。由非完整压裂曲线解释地应力的方法具有可靠性与准确性。
Ground-breaking test based on the hydraulic fracturing is an effective method for measuring the earth/in -situ stresses in the deep formations,and the stress can be interpreted by means of the complete breaking test curve.Unfortunately,most curves got from the fields are not complete,so the stress can not be interpreted.With the help of elastic mechanics,the relationship between the fracture propagation pressure and two horizontal principal stresses is proposed;the stress is interpreted by means of the relation between the fracture initiation pressure and two horizontal principal stresses.The interpreted results of the in-situ stresses in 4 340 m deep formation of Well Joan 002 show that the maximal stress difference is 0.53％ between this new method by the field incomplete curve and the traditional interpreting one,and the corresponding minimal stress difference is decreased to 0.15％.The interpreting method by the incomplete fractured curve is characterized by the reliability and accuracy.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2015年第3期87-90,共4页
Petroleum Geology & Oilfield Development in Daqing
基金
国家自然科学基金资助项目(50304010
90510005)
中石油创新基金项目(05E7015)的部分研究成果
关键词
岩石力学
水力压裂
地应力
裂缝扩展压力
裂缝起裂压力
rock mechanics
hydraulic fracturing/frac
earth/terrestrial/in-situ stress
fracture propagation pressure
fracture initiation pressure
