Experimental Study on Water - Flooding Development of Horizontal Wells in Tight Oil Reservoirs

Abstract

Based on the similarity of pore permeability as well as pore throat structure, nonlinear seepage characteristics and clay mineral content, the outcrop cores are selected to make large-scale physical models. These experiments of staged fracturing horizontal wells are carried out about Madong 2 well area with natural energy exploitation and supplementary energy exploitation. The experimental results show that: (1) the parts of the horizontal well that are easy to water out lie in the wellhead end and the fracture communication area of the horizontal well, the heel end of the horizontal well is easy to water out, and the toe end is difficult to use; (2) The spindle fracture network formed by staged fracturing is easier to control water outflow; (3) For the seven point injection production well pattern staggered by vertical wells and staged fracturing horizontal wells, the heel should be injected early, the middle should be controlled, and the toe should be injected more.