Optimization Design of Horizontal Wells Development in Low Permeability Gas Reservoir in Su 53-4 Well Area

Su Lige gas field is a large gas field which is discovered in China in recent years. It has the poor reservoir properties, low permeability and low efficiency in the process of using vertical wells development. Using horizontal wells development has a large oil and gas drainage area and high production capacity under the unit pressure. In this paper, according to the reservoir characteristics of the typical block Su 53-4 well area, by using numerical simulation method, we studied the optimization design problem of using horizontal wells development in detail. Mainly it includes the reasonable relationship between the extension direction of the horizontal wells in gas reservoir and the principal permeability orientation, the reasonable length and the location of the horizontal wells in the gas layer. We also studied the fracturing parameter optimization design of the horizontal wells. It includes the length, the number and diversion capacity of the fracture under the fixed horizontal wells length and the relationship between the direction of the fracture and the horizontal well extension direction, etc. It is very significance for the results to guide oil-gas field development.