水平井开发异常高压低渗底水油藏采油速度研究

STUDY OF RECOVERY RATE OF HORIZONTAL WELLS IN SURPRESSURE, LOW-PERMEABILITY WITH BASAL WATER RESERVOIR

邱凌 梁俊 李云娟 范子菲 张力庆 麻丽莉

Qiu Ling Liang Jun Li Yunjuan Fan Zifei Zhang Liqing Ma Lili

中国石油勘探开发研究院, 北京 100083 华北油田公司第二采油厂, 河北霸州 065703 河南油田公司勘探开发研究院, 河南南阳 473132

针对肯基亚克盐下石炭系双重介质油藏特低渗异常高压的特点,借助数值模拟手段,在单井双重介质地质模型基础上,考虑应力敏感、底水驱动,研究了水平井衰竭式开采的合理采油速度和开采特征。结果表明,影响采出程度的因素包括地层压力、底水能量和应力敏感等。采用衰竭式开发,有限底水将有助于获得较高的阶段采出程度;应力敏感程度越强,阶段采出程度越低;不同采油速度下阶段采出程度存在一个极大值。综合考虑阶段采出程度、地层压力和含水变化,肯基亚克盐下油田石炭系油藏的合理采油速度为2%~3%。

In order to reasonably develop the unusual low-permeability and high pressure dual-porosity reservoir of Pre-salt carbonatite in Kenkiyak oil field, In this paper takes into account the factors such as pressure sensitization and bottom aquifer drive and studies the production characteristics of horizontal well and reasonable oil recovery rates by the numerical simulation of single well with dual-porosity model. The results show that the effective factors include the formation pressure, the energy of basal water, the pressure sensitivity and etc. In the natural depletion development, small bottom aquifer can improve recovery, and more sensitivity the stress of the reservoir is and less the degree of reserve recovery will be, and there is a maximum degree of reserve recovery in various producing rates. Therefore, account for recovery ratio, formation pressure and water cut, the proper oil recovery rate of Pre-salt carbonate reservoir of Kenkiyak field is 2%-3%.

10.3969/j.issn.1000-7393.2005.03.017