Abstract:

Many problems occur such as reducing water flooding degree,interlayer inference and unbalanced vertical sweep in low and ultralow permeability faultblock reservoirs of W2.Based on the research on the limits of the number of perforated Strata,perforated thickness,permeability ratio,oilbearing area and reserve scale,the limits of oilbearing area and reserve scale for fine division of strata is proposed which suits for W2 faultblock reservoirs.The research on reasonable pressure,production rate and producer injector spacing is carried out and the effective limits for production are proposed.Thus,remarkable results,5.8% for recovery efficiency and 33.64×10⁴t for recoverable reserves,have been achieved since fine division of strata in W2 faultblock reservoirs.

Key words: low and ultralow permeability reservoir, fine division of strata, limits of divisions of strata, limits of development strategies, development adjustment