孔翠龙,邓静静,李伟,莫祥伟,吕放,乐世豪
KONG Cuilong,DENG Jingjing,LI Wei,MO Xiangwei,L?? Fang,LE Shihao

• 1:多资源协同陆相页岩油绿色开采全国重点实验室
• 2:黑龙江省油气藏增产增注重点实验室
• 3:中国石油大庆油田有限责任公司采油工艺研究院

摘要(Abstract)：

为表征古龙页岩油储层在强非均质性、层理发育及力学各向异性影响下的压裂后渗流机制，构建了耦合地质力学与渗流力学的压裂后渗流数值模型，形成变形-损伤-渗流动态耦合计算框架，通过三维数值模拟分析3类典型储层的裂缝扩展与渗流规律。结果表明：上油组（Q_8—Q_9）储层夹层弹性模量为20 GPa时裂缝可穿透夹层、渗流通畅度高，达到30 GPa时裂缝受限于界面并形成“砂岩层/界面→裂缝→基质”阶梯式渗流；中油组（Q_5—Q_7）受高弹性模量夹层制约形成界面-页理交织缝网，产能呈3阶段衰减；下油组（Q_1—Q_4）依赖“基质→页理→裂缝”二次渗流路径，产能后期显著下降；提高排量可增加改造体积，变黏度压裂液体系能协同优化缝高与缝长扩展。按储层类型差异化优化工艺后，试验井区25口井稳定生产，平均日产油量为24.5 t，预测单井EUR（最终可采储量）超3.5×10~4 t。研究成果对古龙页岩油效益开发具有重要指导意义。
To characterize post-fracturing flow mechanism of Gulong shale oil reservoir under the influence of high heterogeneity, well-developed lamellation and mechanical anisotropy, a post-fracturing flow numerical model coupling geomechanics and fluid flow mechanics is established, developing a dynamic coupling calculation framework of deformation-damage-flow. Through three-dimensional numerical simulation, fracture propagation and flow patterns in 3 types of typical reservoirs are analyzed. The results show that, for reservoirs in upper formation(Q_8-Q_9), when the interlayer elastic modulus is 20 GPa, fractures can penetrate the interlayer with high flow conductivity; at 30 GPa, fractures are confined to the interface, forming a “sandstone layer/interface → fracture → matrix” stepwise flow pattern. Reservoirs in middle formation(Q_5-Q_7) are constrained by high-modulus interlayers, developing an interface-lamellation interwoven fracture network and exhibiting a three-stage productivity decline. Reservoirs in lower formation(Q_1-Q_4) relies on the secondary flow path of “ matrix → lamellation → fracture”, showing significant productivity decline in the later stage. Furthermore, increasing displacement rates can increase stimulated reservoir volume, and variable-viscosity fracturing fluid system can synergistically optimize the extension of fracture height and length. After differential process optimization based on reservoir types, 25 test wells achieved stable production, with an average daily oil production of 24.5 t and predicted single-well estimated ultimate recovery(EUR) of >3.5×10~4 t. The research provides significant guidance for beneficial development of Gulong shale oil.

关键词(KeyWords)： 渗流数值模拟;古龙页岩;压裂;动态耦合;渗流规律;参数优化
fluid flow numerical simulation;Gulong shale;fracturing;dynamic coupling;flow patterns;parameters optimization

Abstract:

Keywords:

基金项目(Foundation): 新型油气勘探开发国家科技重大专项“松辽盆地白垩系陆相页岩油勘探开发技术与集成示范”（2024ZD1404902）;; 中国石油天然气股份有限公司非常规储层改造重大专项“多类型页岩油个性化压裂技术与试验”（2023ZZ28YJ04）

作者(Author): 孔翠龙,邓静静,李伟,莫祥伟,吕放,乐世豪
KONG Cuilong,DENG Jingjing,LI Wei,MO Xiangwei,L?? Fang,LE Shihao

DOI: 10.19597/J.ISSN.1000-3754.202508021

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