CAJ | 학술논문

合理注采压力系统优化研究是开发水驱油田关键环节之一。以往采用的算法均存在缺陷：①“吸水、产液指数法”未考虑注采不平衡问题、油水密度差异及体积系数；②“吸水、产液指数及注采比法”未考虑油水密度差异及体积系数；③“吸水、产液指数比及注采压差法”不具有理论和实际意义；④“考虑单井及地层压力变化法”未考虑注水井启动压力、采油井启动压力对油田开发效果的影响。为解决上述问题，基于水驱油田注采压力剖面，提出了优化研究水驱油田注采压力系统的新方法。与以往的算法相比，新方法综合考虑了注采不平衡、油水密度差异、体积系数、注水井启动压力、采油井启动压力梯度等方面的影响因素。结果显示，新方法可适用于水驱油田任何油藏类型、任何油层压力分布状况条件下的合理注采压力系统参数计算。运用新方法对胜坨油田胜一区沙河街组二段1—3砂组油藏进行了合理注采压力系统参数计算，得出了该油藏合理油、水井数比为1.42，合理地层压力保持水平为17.29 MPa，此时合理采液量为14572.41 m3／d，比调整前增加12452.41 m3／d，合理注水量为15906.88 m3／d，比调整前增注13566.88 m3／d，提液增注效果显著。研究结果表明，新方法具有较强的适用性和应用前景。
합리주채압력계통우화연구시개발수구유전관건배절지일。이왕채용적산법균존재결함：①“흡수、산액지수법”미고필주채불평형문제、유수밀도차이급체적계수；②“흡수、산액지수급주채비법”미고필유수밀도차이급체적계수；③“흡수、산액지수비급주채압차법”불구유이론화실제의의；④“고필단정급지층압력변화법”미고필주수정계동압력、채유정계동압력대유전개발효과적영향。위해결상술문제，기우수구유전주채압력부면，제출료우화연구수구유전주채압력계통적신방법。여이왕적산법상비，신방법종합고필료주채불평형、유수밀도차이、체적계수、주수정계동압력、채유정계동압력제도등방면적영향인소。결과현시，신방법가괄용우수구유전임하유장류형、임하유층압력분포상황조건하적합리주채압력계통삼수계산。운용신방법대성타유전성일구사하가조이단1—3사조유장진행료합리주채압력계통삼수계산，득출료해유장합리유、수정수비위1.42，합리지층압력보지수평위17.29 MPa，차시합리채액량위14572.41 m3／d，비조정전증가12452.41 m3／d，합리주수량위15906.88 m3／d，비조정전증주13566.88 m3／d，제액증주효과현저。연구결과표명，신방법구유교강적괄용성화응용전경。
Optimization of rational injection-production pressure system is a key part of developing water flooding oilfield . However,the methods widely used previously have certain disadvantages .The water-absorption and fluid productivity in-dex method does not take into consideration factors such as the imbalance between injection and production fluids ,density difference between oil and water ,and their volume factors .The method of‘water absorption and fluid productivity index and injection-production ratio ’ ignores density difference between oil and water and volume factor .The method of‘index ratio of water-absorption to fluid-productivity and pressure difference between injection and production well ’ has no theo-retical and practical significances .The method of‘considering single well and reservoir pressure variations pays no atten-tion to the influences of start-up pressure of water injection well and start-up pressure of production well on oilfield devel-opment effects .To solve the above-mentioned problems ,a new approach to optimize the injection-production pressure sys-tem in water flooding oilfield was proposed based on the pressure profile of injection-production .Compared with the previ-ous ones,the new method is comprehensive ,taking into account such factors as injection-production imbalance ,density difference between oil and water ,volume factor ,start-up pressure gradient of injection wells and start-up pressure gradient of production wells .Experiments show that it can be applied to parameter calculation of all reservoir types and all reser -voir pressure distributions in a water flooding oilfield .For example,it has been used to calculate the rational pressure sys-tem of injection-production of the No.1 -3 sandstone reservoirs in the 2nd Member of Shahejie Formation of Shengyi block,Shengtuo oilfield.And the result shows that the ratiional ratio of oil to water wells is 1.42,the rational formation pressure-keeping level is 17.29 MPa while the rational fluid-production volume and water-injection are 14 572.41 m3/d and 15 906.88 m3 /d respectively,with 12 452.41 m3 /d and 13566.88 m3 /d more than before,and with a remarkableincrease of fluid production and water injection .