水力压裂选井选层的快速评价方法

QUICK EVALUATING METHOD OF SELECTING HYDRAULIC FRACTURING WELLS AND PAYZONES

蒋廷学 汪绪刚 冯兴凯 王霞 周会得

Jiang Tingxue Wang Xugang Feng Xingkai Wang Xia Zhou Huide

中国石油勘探开发研究院廊坊分院, 河北廊坊 065007 华北油田公司, 河北任丘 062552

利用保角变换和Laplace变换法,推导了无限导流能力垂直裂缝井在不同时间的不稳态产量与累积产量公式。在此基础上,以二连油田乌里雅斯太凹陷储层探井压裂为例,研究了压裂井的储层物性下限,该物性下限是一综合性评价指标,包含有效渗透率、有效厚度、生产压差及地下原油粘度等。低于这个物性指标下限的储层,不宜进行压裂。

A specified conformal transformation function and Laplace method are utilized jointly to establish a mathematical model of calculating a hydraulic fracturing well’s oil rate and accumulative oil at various producing time under the condition of infinite conductivity,Which may select fracturing wells and payzones so as to maximize economic profits.After that,the influence of effective permeability,net payzone thickness,fluid viscosity and the pressure difference of initial pore pressure to the bottom flowing pressure on the fracturing result is calculated according to the model put forward in the paper.Consequently,a comprehensive evaluation index which includes above four parameters is put forward on the base of above calculations,and the result indicates that the fracturing well’s oil rate is unchanged with the index kept as a constant while the included four parameters may be changed greatly,so that the index may quickly select the fracturing wells and payzones.Overall,The study may perform formation evaluation,fracturing effect evaluation and selecting the optimal fracture length.

10.3969/j.issn.1000-7393.2003.04.017