薄层低渗透油藏水平井产能计算程序设计

Deliverability Calculation Program Design of The Horizontal Well in Thin and Low Permeability Rrservoir

低渗透油藏的开发已日益成为石油界主题,水平井在开发薄层低渗透油藏方面有其独到的优势,研究薄层低渗透油藏中水平井的产能,有助于开发经济效益的提高。针对上下封闭边界油藏,建立了物理模型和数学模型。数学模型通过把水平井分成数个微元段来实现,分渗流模型和管流模型。渗流模型通过势理论建立,管流模型借助微元段内压降损失来实现。然后将渗流模型和管流模型耦合迭代求解,通过VB程序实现并进行了计算。最后通过实例计算,一方面显示了该方法的优势,另一方面得出在薄层低渗透油藏条件下,摩阻系数所起的作用微乎其微。

The development of low permeability reservoir gradually becomes the topic of the world.The horizontal well has the special advantage in developing reservoir of this type.Research into the deliverability of the horizontal well,will help us enhance the economic benefit.Focusing on the reservoir with closed boundary,this paper establishes the physical and mathematical model.The mathematical model which includes seepage and tube flow model divides horizontal well into several micro-segment.The seepage model is established by potential theory,and the tube flow model is fulfilled with pressure decline in micro-segment.Then coupling the seepage and tube flow model to solve the equation iteratively.The calculation work is done by VB program.Finally,by instance calculation,two conclusion are obvious：this method has its own advantage in error comparision;friction factor influences tinily in thin and low permeability reservoir.