渗流圆的等效原则  

Study on Equivalent Flow Circle

作　　者：李传亮 邓鹏 朱苏阳 刘东华 LI Chuanliang;DENG Peng;ZHU Suyang;LIU Donghua(School of Petroleum Engineering,Southwest Petroleum University,Chengdu,Sichuan 610599,China;Zhanjiang Branch,CNOOC Ltd,Zhanjiang,Guangdong 524057,China)

机构地区：[1]西南石油大学石油与天然气工程学院,成都610599 [2]中海石油(中国)有限公司湛江分公司,广东湛江524057

出　　处：《新疆石油地质》2018年第6期717-721,共5页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2016ZX05054)

摘　　要：简单的圆形地层和线性地层都有严格的产量计算公式,公式形式与欧姆定律类似,而复杂地层的渗流没有严格的产量计算公式,不方便生产管理。为了研究复杂地层的渗流问题,提出了等值渗流阻力法,把复杂地层等效处理成圆形地层和线性地层的组合,然后按照水电相似原理,计算出复杂地层的渗流阻力,再按照欧姆定律求出地层的产量计算公式。然而,在复杂地层的等效处理过程中,有大渗流圆与小渗流圆的分歧,大渗流圆高估了渗流阻力,低估了油井产量;小渗流圆则低估了渗流阻力,高估了油井产量。渗流圆等效处理方法对水平井的产量计算结果影响较小,对直井的产量计算结果却影响较大。根据研究,小渗流圆的等效处理方法理论上更合理一些,建议今后在进行等值渗流阻力法的研究和应用过程中,废弃大渗流圆等效处理,而采用小渗流圆等效处理。There are strict production calculation formulas for simple round formations or linear formations, and the formulas are similar to Ohm’s law. However, it is difficult to calculate the production of complicated formations because there is no analytical formulas, resulting in the difficulties in production management. In order to study the flow of complicated formations, the paper proposes an equivalent flow resistance method which considers a complicated formation as a combination of round formation and linear formation equivalently, then calculates the flow resistance of the complicated formation according to the principle of water-electricity similarity, finally the production formula is established for the complicated formation based on the Ohm’s law. But during the process, there are still some divergences. Some researchers propose to use a larger flow circle, and some others are likely to use a smaller one. Obviously the larger flow circle overestimates the flow resistance and underestimates the flow rate of wells, while the smaller flow circle underestimates the flow resistance and overestimates the flow rate. The influence of the equivalent circle processing method on the calculated production of horizontal wells is relatively small but is significant on the calculated production of vertical wells. The study shows the equivalent processing method of the smaller flow circle is more reliable than that of the larger one. It is suggested that the equivalent processing method of smaller flow circle should be adopted in the study and application of the equivalent flow resistance method.

关 键 词：圆形地层 线性地层 渗流圆 等值渗流阻力法 水电相似原理 水平井 产量 

分 类 号：TE328[石油与天然气工程—油气田开发工程]