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- Title
超低渗油藏面积波及系数计算新方法.
- Authors
薛永超; 高彦博; 汤继业; 雷艳; 刘宝成; 马明; 蒲保彪
- Abstract
In ultra-low permeability reservoirs, the flow tube method is inadequate for calculating plane sweep efficiency following well pattern adjustments. This study introduces a novel flow tube model tailored for these reservoirs. By integrating the B-L equations with a method that transitions properties from the old flow tube to new ones post-adjustment, using virtual flow and coordinate transformation, this model facilitates swift evaluations of plane sweep efficiency throughout the waterflooding development phase. Utilizing this innovative model, we examined the primary factors influencing the plane sweep coefficient after well pattern adjustments in ultra-low permeability reservoirs and pinpointed the technological constraints of such adjustments. This model has proven effective in field applications. Our findings indicate that optimal results are achieved when well spacing exceeds 200 m, and the anisotropy coefficient is below 5. Furthermore, a larger starting pressure gradient enhances the outcomes of well pattern adjustments. Notably, a typical well group's productivity surged by 47.6% within five years post-adjustment. This novel approach to calculating the area sweep coefficient for ultra-low permeability reservoirs offers valuable insights for assessing the development of the Ordos Basin's ultra-low permeability reservoirs. Additionally, it provides theoretical guidance for adjustments in similar reservoirs.
- Publication
Natural Gas & Oil, 2023, Vol 41, Issue 5, p55
- ISSN
1006-5539
- Publication type
Article
- DOI
10.3969/j.issn.1006-5539.2023.05.009