CO2和地层水、储层配伍性实验研究

针对CO₂驱油方法在近年来得到人们的广泛重视，它在国内尤其在国外应用广泛，取得了良好的驱油效果的实际，研究了注CO₂采油过程中，当CO₂到达储层后，与地层原油、地层水以及储层岩石相互接触，发生一些物理化学性质的变化，使得储层的渗透能力也发生变化的问题。利用中原油田提供的地层水及储层岩石样品进行了CO₂和地层水、储层配伍性的实验研究。测试了注CO₂前后岩芯水测渗透率的变化情况，并进行了原因分析。实验结果表明：注CO₂过程中不会产生碳酸钙沉淀堵塞孔道降低储层渗透率；相反由于CO₂溶解于水中生成碳酸溶蚀了岩石的某些胶结物，使岩石渗透率得到改善。

COMPATIBILITY STUDY OF CO2 WITH FORMATION WATER AND RESERVOIR

CO₂ flooding attracts extesive attention in recent years,it is widely used both home,especially abroad,and good effectiveness is achieved.It is studied that in the process of oil recovery by CO₂ injection,when CO₂ gets into reservoirs,the change in physical and chemical properties occures duo to the contact between CO₂ and crude oil,formation water and reservoir rocks,which makes reservoir permeability change.The compatibility study of CO₂,formation water and reservoir is conducted by using the samples of formation water in core permeability before and after CO₂ injection is tested,and the reason is analyzed.Result indicates that,in the process of CO₂ injection,no calcium carbonate precipitates to plug pore space as to decrease permeability,on the contrary,permeability is improved because CO₂ dissolves in water to form carbonic acid,which dissolves some cement of the rocks.