Abstract: In order to realize the efficient development of the tight oil reservoirs, the multi-media mathematical model of multiple media tight oil reservoir is established on basis of flow equation analysis. The numerical solution of the model is obtained by the Newton-Raphson iteration method, which is used for the validation of the model. Then, the effects of nonlinear flow parameter, cross flow coefficient, elastic storativity ratio, and boundary conditions on well test curves are studied, respectively. Results show that the nonlinear seepage characteristic mainly affects the material exchange between fracture and matrix. When the cross flow ability between large-small fracture and large fracture-matrix is the same, there is only one caviton on the pressure derivative curve. Otherwise, there will be two cavitons. The increase of matrix storativity ratio lead to the increase of the depth of the two concavities at the same time, but the increase of micro fracture storativity ratio only increases the depth of the first caviton.

Key words: tight oil, nonlinear flow, pressure analysis, multiple media, numerical solution