Fracturing Horizontal Well Productivity Evaluation And Well Pattern Optimization Method Research In Tight Gas Reservoirs

The main characteristics of low permeability gas reservoir is low porosity, low permeability and low abundance,besides the complex depositional environment make it difficult to extract. But because the low permeability gas reservoir has rich natural gas resources, wide branch area, it has a huge proportion in natural gas production and the proportion is still increasing. Tight gas reservoir accounts for the majority part in low permeability gas reservoir, is the key of exploration and development. Low production and pressure sensitive effect cause it difficult to explore tight gas reservoir. Recently, along with the mature horizontal technology, it takes large advantage in tight gas reservoir, especially combined with the fracturing technology in horizontal well, achieve wonderful development effect in sulige gas reservoir. But various parameters of fracturing horizontal well including formation parameters and fracture parameters did not make system theory research.Based on existing production data and development experience, using numerical simulation tools and orthogonal test design methods test different parameters which affect horizontal well productivity, At the same time study various parameters influence on horizontal well productivity and comprehensive effect. At last, using numerical simulation software study combined well parttern,considering dynamic characteristics in vertical well pattern, horizontal well pattern and mix well pattern, different well spacing, initial gas velocity and pressure sensitive effect influence features of different geology, and using orthogonal test design analyses different well pattern parameters affect on gas well productivity. By a comprehensive research on the fractured horizontal wells and different well patterns in the developing of tight gas reservoir, the effects of different parameters on development index and the performances under various types of well patterns are obtained. Therefore, a systemic method for determining parameters of fractured horizontal wells is designed, which can provide a theoretical direction and foundation for developing tight gas reservoir with horizontal wells.