水平井早期试井公式

水平井早期流动是指水平井从开始生产起到压力降传播波尚达到储藏边界的阶段。在已有献中早期阶段被视为径向流，早期结束时间也存在各种计算公式，不同公式的结果相差甚大，并且皆缺少理论依据。根据早期时刻的等势面是以水平井两端点焦点的旋转椭球面，并应用质量守恒定律导出早期试井公式和早期结束时间的算法，理论和实例皆表明所推导的公式更能描述早期渗流规律，计算结果更符合实际情况。

Early Well Testing Formulation of the Horizontal Well

The phase was regarded as the radius flow in the published literature, there are various formulations to calculate the early end time, the results of different equations have big errors, and some of them lacked theoretical supports. According to the early iso?potential surface, that is the revolved ellipse surface with the two ends of the horizontal well, the early well testing equations and the calculating method of the early end time were derived in light of the mass conversation. The theory and practice have shown that the equation derived out in the paper more described the early fluid flow law, the calculated results were more reasonable than those before.