分散型调驱体系在高温高盐油藏多孔介质内的匹配性研究

Matchability of Dispersive Drive Systems Within Porous Media in High Temperature and High Salt Reservoirs

储层条件复杂、压力的高低只能宏观表示注入性的难易程度,微观上很难展示出药剂体系与储层渗透率的匹配关系。为满足油田深部液流转向技术需求,以WZ低孔低渗油藏为模拟对象,针对4种不同组分设计的分散调驱体系,对其微观聚集态、溶胀性能和压缩形变能力进行研究;同时考察了微球与人造岩心孔喉的匹配关系。结果表明:A和B具有低膨胀特性,主要依靠地层吸附产生封堵;C、D含有较多亲水性的官能团,微球内外能够形成有效的渗透压差,二者粒径膨胀7倍左右,具有良好的水化溶胀效果;C的杨氏模量均值1.5 GPa,在低孔低渗中易发生形变,易通过储层孔隙喉道,D的杨氏模量均值4.5 GPa,适合中高渗的调剖/封堵应用;最后确定了调驱体系颗粒在岩心内达到初步运移时的渗透率下限。

Complexity of reservoir conditions and the level of pressure can only macroscopically indicate the difficulty of injectivity,and microscopically it is difficult to demonstrate the matching relationship between the pharmaceutical system and reservoir permeability.In order to meet the needs of deep fluid steering technology in oilfield,taking WZ low porosity and low permeability reservoir as the simulation object,the microscopic aggregation state,swelling property and compression deformation ability of the dispersed conditioning system designed for four different components were studied;and the matching relationship between the microspheres and the pore throats of the artificial rock cores was examined.The results showed that,A and B had low swelling characteristics,mainly relying on stratum adsorption to produce blockage;C and D contained more hydrophilic functional groups,and effective osmotic pressure difference could be formed inside and outside the microspheres,and the particle size of both of them swelled by about 7 times,which had a good hydration and swelling effect;the average value of Young's modulus for C was 1.5 GPa,which was prone to deformation in low porosity and low seepage,and easy to pass through the pore throats of reservoir,while that of D was 4.5 GPa,which was suitable for medium and high permeability for the conditioning/blocking application.Finally,the lower limit of permeability when the particles of the conditioning and driving system can reach the initial transport within the core was determined.