Abstract
Low permeability reservoirs has characteristics of difficult exploitation and low productivity. As a new technology in recent years, horizontal well can effectively improve oil recovery, it has been applied to all kinds of reservoirs successfully. Application of horizontal well to develop low permeability reservoirs, can effectively improve single well productivity and increased recoverable reserves. Based on thorough investigation and relevant theory of horizontal productivity prediction, the horizontal well productivity of low permeability reservoirs is studied in this thesis. First of all, some seepage parameters were analyzed under the condition of low permeability reservoirs, such as flow velocity, pressure. The redefined productivity is the function of threshold pressure gradient. Then using law of equivalent percolation resistance and conformal transformation, horizontal well stable seepage productivity formula for conditions of the threshold pressure gradient were derived and partial productivity influential factors were analyzed. In chapter three, horizontal well non-darcy steady flow productivity formula for two different reservoir’ conditions were derived.
