基于薄差储层砂体特征的对应压裂参数设计

Design of Corresponding Fracturing Parameters Based on Thin Sand Reservoir Characteristics

我国陆上油田进入开发后期,而薄差层的储量在剩余可采储量中占有很大的比重,薄差储层的开发已经成为一项重要的挖潜方向。采用数值模拟的方法对薄差注采系统对应压裂的裂缝半径进行了优化。优化结果表明,对水油井压裂裂缝穿透比在35%~45%之间的薄差储层来说,当裂缝半径没有突破渗透率边界时,油井裂缝半径大小对最终累积产油以及采收率影响较大;在油井处于高渗区域、水井处于低渗区域时,水井裂缝半径以及油井周围区域动用情况对最终产油影响较大。

China's onshore oil fields have entered the late stage of development,while the reserves of thin-poor layers account for a large proportion of the remaining recoverable reserves.The development of thin-poor reservoirs has become an important potential for tapping potential.In this paper,the numerical simulation method is used to optimize the crack radius corresponding to the fracturing of the thin-poll injection-production system.The optimization results show that the fracture radius of the well has a greater impact on the final cumulative oil production and recovery when the fracture radius does not break the permeability boundary for a thin reservoir with a fracture penetration ratio of water and oil wells between 35%and 45%.When the oil well is in the high permeability area and the water well is in the low permeability area,the fracture radius of the well and the surrounding area of the oil well are used.The situation has a greater impact on the final oil production.