Interwell interference analysis and well spacing optimization of tight oil wells based on geological engineering integration

Abstract

With the implementation of infilling new wells and refracturing existing ones, the spacing between wells has decreased, the scale of stimulation for individual wells has expanded, and the level of interference among wells has heightened, significantly impacting fracturing effectiveness and production. Objective Addresses issues related to evaluating and preventing interference between wells, Methods based on an integrated geological engineering workflow, 3D DDM and EDFM technologies have been comprehensively used to establish an integrated geological engineering simulation model for horizontal well groups. Then, the operating range of single wells and well groups following fracturing stimulation was evaluated, and factors affecting the degree of interference between wells were analysed. Results The findings indicate that (1) when the matrix permeability exceeds 0.3×10-3 μm2, the half-length of fractures is greater than 100 m, and the spacing between fractures is less than 40 m, a largerrange of fracturing transformation correlates with an increased degree of interwell interference. (2) As the well spacing increases, the degree of interwell interference diminishes. At a spacing of 400 m, the impact of interwell interference on a single well's EUR can be ignored. (3) It is essential to balance the relationship between the block recovery rate and cumulative production of a single well by optimizing and determining appropriate well spacing. Conclusion The above research results can provide valuable insights for optimizing well spacing and enhancing the effectiveness of repeated fracturing technology.

Keywords

• tight oil reservoir
• horizontal well
• geological engineering integration
• interwell interference
• well spacing optimization