摘要
为研究异常高压中高渗油藏的应力敏感特征,以S油田为例,在基于岩心覆压孔渗实验的基础上,通过改变有效应力的方法,对异常高压中高渗油藏储集层的孔隙度、渗透率与不同净上覆压力的变化进行了研究。研究表明:孔隙度的损失引起渗透率的下降,中高渗油藏岩心具有一定的压敏,低渗岩心压敏效应更明显,压敏最终形成不可逆、永久的伤害;由于存在多次加压-卸压过程,异常高压中高渗储集层室内岩心实验压敏效应较小;考虑到压敏叠加效应,异常高压中高渗油藏实际开发过程中压敏效应较大。研究成果对异常高压中高渗油藏的合理开发、合理生产制度的确定等具有指导意义。
In order to study the stress sensitivity characteristics of abnormal high pressure and medium-high permeability reservoirs, taking S Oilfield as an example, based on the experiment of overburden pressure with core porosity and permeability, the changes of porosity and permeability of reservoirs with abnormal high pressure and medium-high permeability and different net overburden pressure were studied by changing effective stress.The results show that the loss of porosity causes the decline of permeability, the core of medium- high permeability reservoir has a certain pressure sensitivity, the pressure sensitivity effect of low permeability core is more obvious, and the pressure sensitivity eventually forms irreversible and permanent damage. Due to the process of multiple pressurization- pressure relief, the pressure sensitivity effect of laboratory core experiments for abnormal high pressure and medium-high permeability reservoirs is small. Considering the additive effect of pressure sensitivity, the pressure sensitivity effect is greater in the actual development process of abnormal high pressure and medium-high permeability reservoirs. The research results are of guiding significance to the rational development of abnormal high pressure and medium-high permeability reservoirs and the determination of reasonable production system.
作者
王永凯
李炼民
Wang Yongkai;LiLianmin
出处
《录井工程》
2019年第1期131-135,142,共6页
Mud Logging Engineering
关键词
异常高压
中高渗
压敏效应
有效应力
应力敏感
叠加效应
abnormal high pressure
medium-high permeability,pressure sensitivity effect
stress sensitivity
additiveeffect
