陕西科技大学学报2024，Vol.42Issue(6)：105-111,7.
玛湖砾岩油藏油水分布状态与压裂模拟裂缝扩展研究
Study on oil-water distribution state and fracture extension of fracture simulation in Mahu conglomerate reservoirs
摘要
Abstract
In order to solve the problems of strong non-homogeneity and unclear factors influ-encing the production of a single well in the dense conglomerate reservoir of Mahu,Xinjiang,we characterised the micro-scale pore throats and the state of oil-water distribution by means of experimental methods such as ultra-vacuum scanning electron microscopy,XRD,CT scan-ning,etc.,and used full-diameter core-scale fracture physical simulation experiments to ex-plore the fracture extension law under the reservoir conditions.The experimental results show that the crude oil fugacity in micro-and nanospace is very limited,distributed into mov-able oil in large pores and bound oil in clay minerals,and the crude oil is unable to form effec-tive aggregation in micro-and nanospace after secondary transport.Dense conglomerate res-ervoirs contain about 30 wt.％～40 wt.％zeolite-like colluvium,and later dissolution pro-duces dissolution pore throats.There is a big difference in the rock strength of gravels and fillers of different compositions inside the conglomerate reservoir,which is easy to produce ring gravel microfractures during fracturing,and the microstructural surface of the reservoir is more developed,with obvious pressure-breaking points,which can be seen from the fractu-ring curves that the fracture shows a volumetric fracturing pattern with 1～2 main cracks as the main cracks,supplemented by multiple microfractures.Through the toughness shear frac-turing process to form micro-fracture volume fracturing,improve the matrix conductivity in the near-fracture zone,to avoid large displacement,large sand volume to produce a single long fracture,conglomerate reservoir fracturing fluid filtration loss is fast,the net pressure is low,and the stress difference in both directions is large,it is difficult to temporarily block the steering;through the addition of the pressure-breaking agent can improve the success rate of the steering.关键词
致密砾岩/微观尺度/油水分布/水力压裂Key words
dense conglomerate/micro-scale/oil-water distribution/hydraulic fracturing分类
能源科技引用本文复制引用
田辉,郑皓轩,刘嘉康,刘鑫,胡瑞雪,田雨..玛湖砾岩油藏油水分布状态与压裂模拟裂缝扩展研究[J].陕西科技大学学报,2024,42(6):105-111,7.基金项目
国家自然科学基金项目(51904180) （51904180）
