摘要
地层主应力纵向连续剖面及平面分布结果对油田套损预测起重要作用.研究认为,综合利用各类井资料信息建立系统的地层主应力计算方法,可有效地提供纵向和平面上的地应力分布.重点涉及以下5方面工作:1)以全井段密度测量数据为基础,建立垂向地应力与岩层深度的计算公式;2)以试油测试地层压力数据为约束,声波时差测量数据为基础,建立地层孔隙压力公式;3)以水力压裂的闭合压力为约束,优化模型参数,建立最小水平应力计算公式;4)由多臂井径曲线提供的椭圆井眼形状推算最大水平应力,并以此为约束,优化最大水平应力计算公式的系数;5)在最大和最小水平应力计算的基础上,给出破裂压力计算公式.以卫星油田葡I油层组为例,以区域地质特征为约束,综合利用国内外相关研究成果,系统地给出了由常规测井资料计算地层主应力的方法和步骤,有效实现了地层主应力平面及纵向分布的合理计算.应力的平面分布对注水井套损预测有非常好的效果.
The vertical continuous profiles and the results of horizontal distribution of main stress play an important role in predicting the casing damage in the oil-field. Research shows that the vertical and horizontal distribution of the main stress can be effectively provided by using a method of calculating the main stress systematically by making use of the various data of well. There are 5aspects in the process of research. Firstly,a formula for calculating the vertical stress with the depth is being built,which is based on the density data of the full well section; Secondly,with the strata pressure data from formation testing as a constraint and based on the data of AC logging,the formula of formation pore pressure is being built; Thirdly, with the closure pressure of hydrofracture as a constraint,and then do the optimization of model parameters,a formula for calculating minimum horizontal stress is being established; Fourthly, the maximum horizontal stress is derived from the shape of the elliptical hole provided by the multi-armed caliper curve,and it is a constraint to obtain the optimizational parameters of the formula; Fifthly, based on the calculation of maximum and minimum horizontal stress,we＇ve got the formula of fracture pressure. Based on the Putaohua I reservoir in the Weixing oil-field,with the regional geological features as constraints and comprehensive utilization of domestic and foreign related researched results,this paper provides the method and process of calculating the main stress by the conventional logging data. The reasonable calculation of the main stress in the horizontal and vertical distribution is realized. And the horizontal distribution of stress is very effective for predicting casing damage of water injection well.
出处
《地球物理学进展》
CSCD
北大核心
2016年第3期1281-1288,共8页
Progress in Geophysics
基金
国家自然科学基金项目(41274132)
东北石油大学研究生创新科研项目(YJSCX2016-004NEPU)联合资助
关键词
地层主应力
常规测井
井壁坍塌
优化约束
套损预测
main crustal stress
conventional well logging
side-wall collapse
optimization constraint
casing damage prediction
