粘土矿物水化效应对防砂管挡砂介质微观堵塞机理研究

Based on real simulation of loose sandstone reservoir porosity osmosis characteristics, characteristics of particle size distribution and clay mineral composition of full size sand control pipe plugging mechanism under the condition of physical model experiment and theoretical analysis in the term of downhole temperature and pressure. Clay mineral composition of hydration effect is firstly introduced into reservoir micro particles hydration expansion effect in the sieve block sand clogging mechanism, micro crack permeability change rules ,cased by migration, accumulation and congestion, have been carried out in micro particles research of different types of screen to block sand medium before and after the hydration of micro cracks in. Based on the fluid and solid coupling method, starting from the micro particle mechanics migration and hydration expansion ,we have built the modol which has the characteristics of the content of the micro-particles , the component with screens of different block sand medium micro slits shape and size, to find out the accuracy of different sand retention media as well as different sand control pipe plugging mechanism of precision. Besides we have also established a set of sand control pipe selection criterias and mechanism of sand control pipe blocking sand accurately,which provide theoretical basis for the optimization design method.

基于真实模拟井下温压条件、疏松砂岩储层高孔高渗特性、粒度分布特性及粘土矿物组分水化效应等条件下的全尺寸防砂管堵塞机理物模实验与理论分析，首次引入储层粘土矿物组份水化效应在筛管挡砂介质堵塞中的作用机理，研究粘土矿物组份水化前后在不同类型筛管挡砂介质微缝隙中的运移、堆积与堵塞造成的微缝隙渗透率变化规律；基于流固耦合的方法，从微颗粒力学运移与水化膨胀两个角度，建立微颗粒含量、组份与筛管不同挡砂介质微缝隙形状、尺寸的内在相关性模型，从而摸清不同挡砂介质以及不同挡砂精度的防砂管堵塞机理，为建立一套防砂管优选标准及防砂管挡砂精度优化设计方法提供理论依据。

本课题针对目前海上砂泥岩互层储层开发以及高含泥质的储层机械防砂过程中出现了防砂筛管堵塞的问题，深入的开展了基于黏土矿物水化膨胀效应防砂管挡砂介质微观堵塞机理研究。在黏土矿物组构及化学特征分析的基础上，明确了黏土矿物类型的水化强弱特征，在此基础上通过室内实验定量评价了不同溶液介质、矿化度、蒙脱石含量、温度和压力等因素影响下的膨胀率；根据现场实际工况对现有的防砂实验装置进行了改造，形成了一套“多层系可旋转出砂模拟实验装置”，建立了一套实验评价方法及评价标准，并在此基础上通过大量不同条件下的防砂物理模拟实验，从而研究了防砂筛管的堵塞机理；结合海上油田储层特征，通过室内出砂模拟实验，考虑完全挡砂和适度挡砂两种防砂理念，建立了防砂参数优化设计图版。项目资助发表中文核心论文3 篇； 授权软件著作权 1 项。培养硕士研究生6 名。