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.
出处
《石油钻探技术》
CAS
2004年第2期18-20,共3页
Petroleum Drilling Techniques
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
development well
pore pressure
formation breakdown pressure
hole stabilization
Madong Oilfield
