Test and the Monitor Techniques of Waterflood Front and Frature;

Reservoir engineers pay attention to waterflood direction and waterflood front location,which are analyzed and determined by most of reservoir engineers experientially.

However, the dynamic monitoring of dual step horizontal wells is a kind of new task, and it is difficult to diagnose the advancing direction of injected water, the main displacement direction, and the area swept by waterflood front.

through the relation between frontal water cut derivate and pseudo-skin factor caused by derivative of water content ratio of water-flood front and distribution of mobility .

Gas reservoir development indicates that edge water drive gas reservoir is much lower in recovery efficiency compared to fixed volume gas reservoir.

In this paper,techniques of tracer monitoring are successfully applied in development exploitation of edge water drive reservoir,the course and velocity of edge water propulsion are confirmed.

Based on material balance principle and one-dimension two-phase unsteady water drive theory, the water breakthrough model of line well pattern in edge water drive reservoir is established, and the front advance velocity equation is derived at the same time.