Recognition And Evaluation Of Low Resistance Flow-path In H Block

The injected water does long-term ineffective or inefficient circulation along the low resistance flow path. So the oil production declined and water cut increased so fast. In order to improve the water flooding development effect and stabilize oil production and control water cut, it is necessary to identify and evaluate the low-resistance flow path.This article is aimed at the problem that the low permeability-fracture type reservoir of H block. Applying the method of dynamic analysis to classify the level of the water cut, at last,we confirm the 39 extra high water-cut oil wells. Through the mthod of dynamic splitting, we confirm the extra high water cut layers. Through the correlation analysis, we confirm the water coming direction and the layers of high water cut wells. Through the method of technology pressure index decision, we identify 19 wells of the low-resistance path. There are103 oil wells and 27 water wells of H block used to comprehensive identify and evaluate the low-resistance path by multi-index comprehensive evaluation. There are 56 oil wells and 12 water wells have the low-resistance path, and 41 layers with the low-resistance path are also identified. Through the method of comprehensive dynamic analysis, pressure index decision and multi-index comprehensive evaluation, the result of the low-resistance path of H block are identified and the distribution laws are all summed up.Based on the precipitation facie, reservoir anisotropy and fracture of H block, the main controlling factor of the low-resistance path can be confirmed. The feather of reservoir precipitation facie would be analyzed to calculate permeability contrast, permeability variation coefficient and permeability coefficient of dart. The testing data of earth tremor and front detection by tracer agent would be analyzed. The influence for formation and distribution of the low-resistance path would be evaluated by feather of reservoir, reservoir anisotropy and the situation of fracture.This article combined the three methods, including dynamic analysis, pressure index decision and multi-index comprehensive evaluation to identify the low-resistance path. The results will more reliable. The conclusions have important guiding significance for oilfield development.