孔隙压力变化对地应力的影响研究  

The Effects of Pore Pressure Alterations on the In-situ Stress

作　　者：梁何生[1] 闻国峰[2] 王桂华[3] 张永忠[1] 程远方[3] 赵俊华[1] 

机构地区：[1]大港油田集团公司钻采工艺研究院,天津大港300280 [2]大港油田分公司油田开发事业部,天津大港300280 [3]石油大学华东石油工程学院,山东东营257061

出　　处：《石油钻探技术》2004年第2期18-20,共3页Petroleum Drilling Techniques

摘　　要：在开发井的生产过程中,地层孔隙压力降低的同时,地层的破裂压力也在降低,这是由地层孔隙压力的变化导致地应力,特别是两个水平主地应力产生了变化引起的。推导出了两个水平主应力随地层孔隙压力变化的理论公式和地层破裂压力、坍塌压力的预测公式,计算了大港油田马东区块开发前后的两个水平主应力、地层破裂压力、坍塌压力,证明了这些公式的可靠性。During production in development wells,it is found th at the formation fracture pressure decreases with the formation pore pressure in the different hydrocarbon fracture workovers. For example:the Gangshen10- 18 Well in the Madong Oilfield have ever fracture the same formation (Banshen) t wice, On 28th,7, 1999,the wellbore bottom formation fracture pressure is 78.4MPa whil e that on 16th,6, 2000, is 73MPa. The cause is that the change of the formation pore pressure affect greatly the in-situ stress, especially the two horizontal s tresses. The problem is discussed in this paper and analysed with the insite exa mples of the Madong area in the Dagang Oilfield.

关 键 词：地层孔隙压力 地应力 地层破裂压力 井眼稳定 坍塌压力 

分 类 号：TE22[石油与天然气工程—油气井工程] TE28