为探索玛湖地区致密油藏多层系立体井网整体压裂效果,提高油藏采出程度,在构建三维地质模型和地应力模型的基础上,通过地质工程一体化方法,开展了地应力参数三维空间展布特征研究,分析井间、簇间的应力相互干扰对整体压裂效果的影响,确定了最优簇距、缝长、布缝方式及作业顺序,确定了小井距水平井立体井网开发整体压裂优化参数。研究表明:采用立体井网模式开发,优化簇距、单簇裂缝规模,采用拉链式交叉布缝的方式,能够显著提高储层改造效果,研究区缝控储量动用程度由70%提升至90%。该研究为油层厚度大、连续性较好的叠置储层区块开发提供了借鉴。
In order to explore the overall fracturing effect of the multi-layered system vertical well network in tight oil reservoirs in the Mahu area and to improve the recovery degree of reservoir, a study on the three-dimensional spatial distribution characteristics of the ground stress parameters was conducted through an integrated geological engineering approach based on the construction of a three-dimensional geological model and a ground stress model, and the influence of inter-well and inter-cluster stress interference on the overall fracturing effect was analyzed, the optimal cluster distance, fracture length, fracture layout method and operation sequence were determined, and the optimized parameters for the development of vertical well pattern for small-well spacing horizontal wells were identified. The study shows that the vertical well pattern mode is adopted for development to optimize the cluster distance and a single cluster fracture scale. The zipper crossed arrangement of fractures can significantly improve the reservoir stimulation effect. The production degree of fracture-controlled reserves in the study area was increased from 70% to 90%. This study provides a reference for the development of stacked reservoir blocks with large oil thickness and good continuity.
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