The mathematical simulation method of migration of fines and clay swell in elastic porous medium
The mathematical simulation method of migration of fines and clay swell in elastic porous medium
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作者：
Ju Bing
孔隙变形、粘土膨胀、孔隙介质中原位微粒的释放、运移和滞留以及注入流体携带的外来颗粒侵入是引起孔隙度和渗透率变化的主要因素。在油田注水过程中，由于孔隙变形、粘土膨胀、微粒运移和滞留等原因造成的储层损害是一种常见的现象。在简要介绍孔隙变形、粘土膨胀、微粒在孔隙介质中的释放、运移和滞留以及微粒在孔隙体表面吸附和孔喉堵塞造成的储层损害机理的基础上，建立了描述储层损害过程的综合数学模型，并采用有限差分法进行了求解。并通过多次试验研究了外来颗粒和原位微粒运移引起的孔隙度和渗透率变化的动态特征。
The pore deformation, clay swelling, the release, migration and retention of in situ fines in the porous medium and the invasion of external particles carried by injected fluids are major factors to bring about change in porosity and permeability. It is a common phenomenon of formation damage caused by pore deformation, clay swelling, migration and retention of fines in the process of water injection in oilfields. Following a brief review of the mechanism of pore deformation, clay swelling, fine release, migration and retention in porous medium and formation damage result from adsorption of fine on the surface of pore bodies and blocking at pore throats, a comprehensive mathematical model to describe the process of formation damage was developed and solved by the finite difference method. And a number of runs were used to study the dynamic characteristics of porosity and permeability changes caused by the migration of external particles and in situ fines.