Influence of Perforation on Formation Fracturing Pressure

作     者：张广清 陈勉 王学双 赵冲 ZHANG Guangqing;CHEN Mian;WANG Xueshuang;ZHAO Chong

作者机构：石油大学石油天然气工程学院中国北京昌平102249 吉林油田钻井服务公司中国吉林省松原市138001 大港油田钻井工程公司中国天津大港300280 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2004年第1卷第3期

页      码：56-61页

摘      要：Hydraulic fracturing treatments of oil wells are greatly affected by the perforation parameters selected. The three-dimensional finite element model together with the tensile criterion of rock materials is employed to systematically investigate the influence of perforation parameters, such as perforation density, perforation orientation, perforation diameter, and perforation length as well as wellbore ellipticity, in vertical wells on the formation fracturing pressure. Based on a six-month simulation research in the University of Petroleum, China, several conclusions are drawn for the first time. Perforation density and perforation orientation angle are the most important parameters controlling the formation fracturing pressure. As the perforation density increases, the fracturing pressure decreases, not linearly but progressively. The fracturing pressure increases with the perforation orientation angle only when the angle is less than 45 degrees, and the relationship becomes very flat when the angle is 45 degrees. However, with regards to the perforation diameter and perforation length, their influences are much slighter. The wellbore ellipticity has a significant effect on the formation fracturing pressure. It is obvious that fracturing pressure increases linearly with the ellipticity of the wellbore.

主 题 词：Fracturing pressure three-dimensional finite element perforation parameter 

学科分类：0820[工学-航空航天类] 082001[082001] 08[工学] 

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