定性判别电潜泵剪切作用造成产液乳化的数值模拟方法  

Numerical simulation method for distinguishing qualitatively production fluid emulsification due to ESP shear action

作　　者：郑力会[1] 李光蓉[2] 

机构地区：[1]中国石油大学石油工程教育部重点实验室,北京102249 [2]大港油田公司采油四厂,天津300280

出　　处：《石油钻采工艺》2008年第3期75-78,共4页Oil Drilling & Production Technology

基　　金：国家自然科学基金项目(编号:50304010)部分内容;教育部"长江学者和创新团队发展计划"(编号:IRT0411)资助

摘　　要：地层产液乳化是开采过程中常见的储层伤害类型之一。电潜泵剪切作用有可能造成或加剧产液乳化。产液乳化在流入井筒前产生还是在井筒内造成,判断难度较大。利用多相流连续性方程、动量方程、能量方程,建立考虑剪切作用的井筒多相流动态理论模型。将各相分量代入方程,建立油田产液的井筒多相流动态理论模型。再代入实际生产数据,建立适合油田的数学模型,计算了5口井产液量,与实际产液量相近,表明模型合适。预测该油田5口典型井的原油含水率分别为0、20%、40%、60%、80%时,井深与井内流体压力分布关系。结果表明,将产液提升单位高度消耗的能量,泵前小于泵后,电潜泵加剧了产出液的乳化程度。该研究为较准确地判断是否产液乳化造成储层伤害提供了依据。The production fluid emulsification is a usual type of formation damage. Electrical submersible pump （ESP） shear action may result in or intensify production fluid emulsification. It gets more difficult to determine whether the production fluid emulsification is caused before the production fluid flows into wellbore or when it is in the wellbore. Using the continuity equation, momentum equation, energy equation for oil - gas - water multiphase fluid, a dynamic theory model taking shearing into account is established. After substituting the components of each phase, a multi - phase fluid dynamic model is established for oilfield production fluid. Then the actual production fluid data is substituted, so a mathematic model suitable for oilfields is established. The production fluid of 5 wells is calculated, which approaches to the real production fluid. It indicates that the model is appropIiate. The relationship between the well depth and the well fluid pressure distribution is predicted when the water cut of the five typical wells of the oilfield is 0, 20% , 40% , 60% , and 80%. The result shows that the energy consumption before pump is lower than that after pump when enhancing unit well fluid, that is, emulsification of produced fluid is intensified by ESP. It gets easier to determine whether the formation damage is caused by production fluid emulsification.

关 键 词：电潜泵 产液 剪切 乳化 数值模拟 

分 类 号：TE256[石油与天然气工程—油气井工程]