Analysis of Production Dynamics of Fractured Horizontal Well with CO2 Huff and Puff in Shale Reservoirs

In view of the current situation lack suitable calculation models for analysis production dynamics fractured horizontal well with CO2 huff and puff in shale reservoirs，based on process mechanism puff, an analytical model reservoirs was proposed, which took into account changes crude oil viscosity volume caused by difference concentration at different locations formation after soaking adsorption desorption matrix. The solution performed Laplace transform factors affecting pressure rate during were analyzed. results show that seepage flow included seven stages: wellbore storage, hydraulic fracture radial flow, linear laminar to matrix unsteady two-three-four zone transition boundary control flow; bedding had a significant effect early, greater inflow capacity, smoother derivative, higher rate; amount adsorbed matrix, slower front propagates, lower required differential pressure, well, longer stable time; diffusion coefficient mainly affected fracture, larger coefficient, smaller constant production, increase throughput rounds, increased, but decreased.