砾石尺寸评价与优选方法研究

砾石尺寸的选择是砾石充填防严重的砂侵,小的砾石尺寸挡砂效果好但对油井产能的影响较大.分析和研究了地层砂侵入砾石层的特性和砾石层压降计算方法,评价了其挡砂效果及对产能的影响,建立了砾石尺寸综合评价方法.采用Saucier、Depriester和Schwartz 3种常规选择方法得到3种砾石尺寸结果,分别对其进行综合评价,优选出最佳砾石尺寸.

A New Model for Gravel Size Evaluation and the Optimization

The gravel size decision is the key step of successful gravel-packing sand control. Coarse gravels are helpful to obtain higher productivity, but it maybe leads to serious formation sand invasion. Fine gravel size can block formation sand well, but it has passive influence on well productivity. The sand blocking effect and Influence on productivity are evaluated by analyzing the invasion characteristic of formation sand into gravel pack and the calculation of pressure drop across gravel pack. Then a new integrated evaluation method for gravel size is evolved. The optimum gravel size is decision by comparing the three gravel size results, which are obtained by three normal gravel size decision methods, that is, Saucier, Depriester and Schwartz.