On the basis of meeting the accurate history matching, summarizing the waterflooding characteristic of different development stages for different sedimentation type and the final recovery ratio of different sedimentation type was forecasted through them.

Using several waterflooding characteristic curves analyze the block,and improvement suggests are presented for water injection development according to the waterflooding effect evaluation.

Seepage flow patterns and water driving characteristics are special in deep low permeability oil layers.

Solution of characteristic equation in eigenvalue problems of spherical Bessel equation by using Matlab algorithm;

Approximation solution of characteristic equation of guide wave in a semicircle tunnel;

Generalization and Application of the Characteristic Equation of Matrix with Applications;

Using characteristic equations and elementary transformation,we present general solution of integrable Riccati differential equations and its application.

The dispersion secular equation and displacement equation of Stoneley waves in infinite\|solid media are obtained in this paper.

The secular equation and displacement equation of Stoneley waves in two infinite fluid solid media are derived in this paper.

The secular equation and displacement equations of Stoneley waves in two infinite fluid solid media are deduced by using analytical method in this paper.