宝浪油田地应力和裂缝特征研究与应用

RESEARCH AND APPLICATION OF FORMATION STRESS AND FRACTURE FEATURE IN BAOLANG OILFIELD

采用井孔崩落、差应变分析等测试技术及三维有限元数值模拟方法研究了宝浪油田的地应力大小、方向及分布特征 ;水平最小主应力为 5 0～ 5 5MPa ,宝中、宝北区块水平最大主应力方向分别为北东 6 5°～ 84°和 46°～5 9 6°。基于岩心的系统观测统计和裂缝测井响应研究宝浪油田的天然裂缝特征 ,裂缝系统发育不均匀 ;以倾角为0°～ 2 0°之间的低角度潜在裂缝为主 ,中低角度剪切裂缝普遍存在 ,也有大于 6 0°的高角度剪切裂缝 ;岩石裂缝走向较为复杂 ,断层附近裂缝较发育。分析了宝浪油田地应力场特征和天然裂缝特征对开发井网布局、斜度井方向、优化射孔、压裂、注采方案设计等的影响 ,提出了系统而具体的建议 。

The magnitude,direction and distribution feature of formation stress of Baolang Oilfield are studied by using test techniques of borehole sloughing and differential strain analysis etc.,and 3D finite element numerical-analog methods.Minimum horizontal major stress is 50～55MPa.Maximum horizontal major stress direction of center Baolang and north Baolang is N 65°～84°E and N 46°～59 6°E.In this paper,natural fracture feature of Baolang Oilfield is studied on the basis of systematic observation statistics of core and fracture log response.Its fracture phylozone is nonuniform.Tfrend of rock fracture is very complex.The paper analyses the effect of stress field feature and natural fracture feature on distribution of development well,inclined well direction,and optimizing perforation,fracturing and injection-production project design etc..In order to develop rationally Baolang Oilfield,some suggestions are proposed.