Discussion on Development Parameter Optimization and Limit Determination of Horizontal Wells in Low Permeability Thin Reservoir

The regional structure of an oil field is located in the south of Z sag in the central depression of the northern Songliao Basin. It is a typical low permeability thin reservoir. Since 2002, horizontal well development test has been carried out in T reservoir. The initial and cumulative production of horizontal well is more than 3 times of that of vertical well, at present, it has become one of the main technologies for the effective development of peripheral low permeability reservoirs. In this paper, horizontal Wells in T reservoir are taken as the research object, and combined with the production status of horizontal Wells that have been put into production, the parameters of horizontal well type, length, pattern and spacing are optimized to provide guidance for the development of horizontal Wells in similar reservoirs. The limits of sand body size, effective thickness and reservoir physical property are determined according to the economic limit production limit of single well and the relationship between effective thickness, reservoir physical property and horizontal well production.