Determination of Reasonable Well Spacing Density and Injection-to-Production-Well Ratio in Waterflooding Field

One of the crucial issues in reservoir engineering study is how to choose pattern well spacing in order to reach the highest re- covery and optimal economic efficiency by waterfooding process for field development project designing and well pattern infill or adjust- ment. Based on the relationship among recovery, well spacing density and injection-to-production-well ration given by Reference [1], inte- grated with other methods such as economic evaluation and injection-production balance analysis, etc., this paper proposes a new method for determination of. reasonable well spacing density and injection-to-production-well ratio in waterflooding field.The case analysis and calculation from QL oilfield shows that there are additional potentials on the primary density and ratio under the rising of current oil price.