文章摘要
依据水驱前缘移动规律优化分层注采压差
Optimization for injection-production pressure defference based on the movement law of water flooding front in two layers
投稿时间:2019-08-29  修订日期:2019-08-29
DOI:
中文关键词: 渗流  纵向非均质性  水驱前缘  层间突进  模型  注采压差
英文关键词: Percolation  profile heterogeneity  waterflooding frontal edge  interlayer breakthrough  model  injection-production pressure difference
基金项目:国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”(2016ZX05050)。
作者单位E-mail
朱圣举 中国石油长庆油田分公司勘探开发研究院 zsj_cq@petrochina.com.cn 
朱洁 中国石油长庆油田分公司第六采气厂 zsj_cq@petrochina.com.cn 
安小平 中国石油长庆油田分公司勘探开发研究院 zsj_cq@petrochina.com.cn 
张皎生 中国石油长庆油田分公司勘探开发研究院 zsj_cq@petrochina.com.cn 
摘要点击次数: 18
全文下载次数: 
中文摘要:
      针对两层层间注采压差的优化问题,依据水驱油藏基本渗流理论,运用数学解析法,推导出了径向渗流两层层间注采压差优化模型。利用鄂尔多斯盆地某实际砂岩油藏进行计算,相对误差为6.28%~7.48%。研究结果表明,上下两层水驱前缘位移跟井筒半径的平方差之比与其相应的注采压差之比成一直线函数关系式,水驱前缘的移动速率与水驱前缘位移成一反比例函数关系式。定义了两层储渗纵向非均质系数,系数越大,储渗纵向非均质程度越严重。解决层间矛盾的有效方法,就是调整分层注采压差。最佳分层注采压差就是满足两层储渗参数之比值与相应注采压差之比值的乘积等于1时的注采压差,只有在这种条件下,上下两层在不同的位移处渗流速率均相等,也才不会发生层间突进现象。该方法在水驱砂岩油藏纵向非均质性评价以及分层压差优化设计等方面均具有推广价值。
英文摘要:
      Aiming to the problem about optimization for injection-production pressure difference of two layers,based on the water flooding theory of oil reservoir, the formula for describing the interlayer pressure difference about radial flow state was deduced by using mathematical analytic method.The interlayer breakthrough time in a block of the Ordos basin is calculated by the method. The result is close to the real time, with a relative error of only 6.28%~7.48%.It is indicated that the ratio about the quadratic difference of displacements of waterflooding frontal edge and wellbore radius in two layers is in a linear functional relationship with the ratio about the corresponding injection-production pressure differences. And the movement velocity of water flooding front is in an inverse proportional functional relationship with the water flooding front. The heterogeneity coefficient of two layers is defined.The larger the coefficient,the more serious the interlayer heterogeneity.The effective way to solve interlayer breakthrough is to adjust the injection-production pressure difference in different layers.The best stratified differential pressure is the one that the product of the ratio of the flow field parameters and ratio of corresponding injection-production differential pressure is equal to 1 in the two layers. Only under this condition can the interlayer breakthough not occur. And the seepage velocities of the upper and lower layers are equal at different displacements in the condition.This method is worth popularizing in evaluation of profile heterogeneity and optimization of stratified injection-production differential pressure in waterflooding sandstone reservoirs.
View Fulltext   查看/发表评论  下载PDF阅读器
关闭

手机扫一扫看 分享按钮