The Numerical Simulation Study And Optimization Design Of Horizontal Wellon LG Block Of Liaohe Oil Field

LG block is a common thin oil reservoir in the Liaohe Oilfield,characterized by complicated geological condition,large amplitude of structure. The total area is about 1.02km2. Since 1988 March, the block is exploited,there are 24 wells by the end of October 2012. the total recovery ratio is 16%,All kinds of reasons such as complicated geological condition, the block sealing process,large amplitude of structure and so on result in that the distribution of the remaining oil is not even in the main oil-layers. The numerical simulation and Parameter optimization of horizontal well are used to develop the main reservoir,to enhance oil recovery. Four horizontal wells are drilled in this block.Petrel is used to build a geological model of LG block. Eclipse is used to finish waterflood history matching and evaluate residual oil potential. Furthermore,effect,such as resevoir’s heterogeneity, fault sealing and unreasonability of structure and injection production well pattern, on distribution of the remaining oil is analyzed.The best position and direction of the horizontal wells is optimalized, by ways of Eclipse(numerical simulating software),in the actual simulation model of LG block. The optimalized results show that the best position is located in the zone among conings between Lei24-10 and Lei25-11. According to the optimalizing standard that the maximum cumulative production,the best direction of the horizontal well must be parallel to structure contours, and the horizontal segment of the wells must be in the main channel,optimalize vertical thickness of the horizontal segment is located in the 15 m under bottom water according as the optimalizing standard of input-output ratio,the best length of the horizontal sengment in the bottom water oil-layer without any interlayer is 300 m according as the optimalizing standard of economic value,the best pattern of perforated completion is 60% of opening degree according as the optimalizing standard that the maximum cumulative production.The above optimalized results of parameters are used to guide deployment of 4 horizontal wells.The research results of the thesis can guide horizontal wells deployment of LG block in Liaohe Oilfield,moreover,provide technical support to raise production capacity of the horizontal wells,which is of great scientific significance for the sustainable development of Liaohe Oilfiekld.