海上低渗透油藏低速非线性渗流修正模型及井距优化  

A Modified Low-velocity Nonlinear Flow Model for Offshore Low PermeabilityReservoirs and Well Spacing Optimization

作　　者：张利军 赵林 徐世乾 卢聪[2] ZHANG Li-jun;ZHAO Lin;XU Shi-qian;LU Cong(CNOOC Research Institute,Beijing 100027,China;Southwest Petroleum University,State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Chengdu 610500,China)

机构地区：[1]中海油研究总院有限责任公司,北京100027 [2]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500

出　　处：《科学技术与工程》2024年第34期14641-14648,共8页Science Technology and Engineering

基　　金：中国海洋石油集团有限公司“十四五”重大攻关工程项目(KJGG2022-0701);国家自然科学基金(52304045)。

摘　　要：基于毛管束模型,结合边界层厚度与压力梯度之间的关系,建立了海上低渗透油藏低速非线性渗流修正模型,利用基于嵌入式网格的流固耦合模型与三维压裂井黑油模型,对比了本文研究与传统低速非线性渗流模型对数模求解稳定性影响,优化了海上低渗透油藏五点井网井距。结果表明:与前人研究相比,本文提出的非线性渗流修正模型更加合理,且与实验数据拟合精度更高。与传统低速非线性渗流模型相比,本文提出的修正模型使衰竭开采数模模型降低非线性迭代次数85.7%。同时,使两口压裂井注采数模模型从不能收敛变得稳定收敛。随着井距增加,井组累积产油量呈现先增加后减少的趋势,存在最佳井距。此外,最佳井距随基质渗透率增加而增大。该方法为准确优化海上低渗透油藏井网参数提供了高效工具。Based on the capillary bundle model,combined with the relationship between the boundary layer thickness and the pressure gradient,a modified low-velocity nonlinear flow model for offshore low permeability reservoir was established.By using the fluid-solid coupling model and the 3D fractured well black oil model based on embedded mesh,the stability of numerical simulation was compared with that of traditional and our proposed low-velocity nonlinear flow model.Finally,the well spacing of five points well pattern in offshore low permeability reservoir was optimized.The results show that compared with previous studies,our proposed nonlinear flow model is more reasonable.The accuracy of fitting with experimental data is higher.Compared with the traditional flow model,our proposed low-velocity nonlinear flow model can reduce the number of nonlinear iterations by 85.7%in a numerical simulation model of depletion production.At the same time,in an injection-production numerical model of two fracturing wells,our proposed nonlinear flow model makes it stable convergent from non-convergent.With the increase of well spacing,the cumulative oil production of well group increases first and then decreases.There is an optimal well spacing.In addition,the optimal well spacing increases with increasing matrix permeability.This method provides an efficient tool for accurately optimizing well pattern parameters of offshore low permeability reservoir.

关 键 词：海上低渗透油藏 非线性渗流 边界层 数模稳定性 井距优化 

分 类 号：TE348[石油与天然气工程—油气田开发工程]