Study On Optimization Of Horizontal Well In Complex Fault Block Reservoir

Taking horizontal wells in complex fault block reservoirs of Gangdong development area in Dagang Oilfield as a research object, integrated application theoretical research and practical analysis, an optimization method for horizontal well in fluvial reservoir has been summarized during the middle-later period of oilfield development, which not only provide a good example, but also provide research method reference for similar reservoirs.Based on reservoir characteristics of Gangdong development area, the screening and evaluating system of horizontal wells in complex fault block reservoirs and its fine modeling and the quantitative description for its remaining oil have been studied, besides that, with practical examples, applying reservoir engineering analyses and numerical simulation means, optimization method research of horizontal wells in complex fault block reservoirs is carried out, and combination with geological basic research results, by development mechanism analysis and reservoir engineering study, in view of analytical methods and numerical simulation ,the methods of predict and optimize the horizontal wells in complex fault block reservoirs are discussed. Though comprehensive research, the following major understanding are achieved:1. Combination of reservoir characteristics in Gangdong development area, using economic dynamic balance methods ,the related parameters boundary relations between economic effect and the development of horizontal wells reservoirs have been studied, and combination screening and evaluating system studying of the development of horizontal wells in complex fault block reservoirs, the parameters for its target layer have been definited.2. In view of study target layer, integration seismic data, reservoir static and dynamic data, according to lithologic association, the exact calibrate of thin sand is realization though the fine demarcate technology of log-segmental -parvafacies -discretization- synthesization.3. Begin with sedimentary micro-facies, integrated static and dynamic information analysis, though full three-dimensional of multimer interaction of chronohorizon interpretation, reservoir evaluation of using multi-information fusion, and identification and description of channel sand, the quantitative description of single sand body's distribution, density and heterogeneous are implement ,and build up reservoir architecture model. Based on single sand study, combination geological model and reservoir numerical simulation, the exact distribution of remaining oil is quantity researched, which can useful guide the implementation of horizontal wells.4. It proceeds a detail study on optimization and design for different kinds of horizontal wells's orientation, location, the length in complex block fault reserviors, by using the practical examples and the methods of reservoir engineering analyses and numerical simulation means. It also summed up the optimization and design methods for these horizontal wells.5. At the base of collection,arrangement,analysis of the theory of analytical method productivity prediction, it is the first time that lead the phase permeability data into the productivity prediction. It has studied the productivity prediction and optimization methods with examples for bedded sandstone reservoirs,basal water reservoirs and positive rhythm thick oil layer which have interbed when high water cut stage.