Southwest Petroleum University

Hongmei Ren

Yijian Chen

Ping Guo

Zhouhua Wang

Yisheng Hu

Huang Liu

Jianfen Du

Wanbo Zhang

Shuai Wu

Huimin Zhang

Yuhong Du

A direct method for manufacturing a large model fractured core and maintaining original oil-water saturation, including the following steps: (1) determining the volume V, porosity &#x3c6;, permeability K, oil saturation S, water saturation Sand the like of a fractured core to be manufactured; (2) preparing simulated oil, and determining the used oil mass m=V&#xd7;&#x3c1;; (3) under the circumstance of no consideration of oil saturation, acquiring the mass of the used water, cement and quartz sand; (4) while establishing oil saturation, acquiring the mass mof water for manufacturing the core as m=a&#x2212;V&#xd7;&#x3c1;; (5) mixing oil, water and an emulsifier evenly to prepare an oil-in-water emulsion; (6) adding cement and quartz sand into the emulsion and stirring evenly to obtain cement slurry; (7) when a cement sample is in a semi-solidified state, cutting the cement sample with a steel wire; and (8) solidifying the cement sample to the end.

Direct method for manufacturing large model fractured core and maintaining original oil-water saturation

A manufacturing method of a big-model low-permeability microcrack core includes: (1) determining the size of a microcrack core to be manufactured; (2) placing stones in a baking oven to bake for 24h under 120&#xb0; C., placing the stones into a mixer, mixing and spraying oil, enabling the oil to seep into the stone, evenly forming a thin oil film on stone's surface; (3) mixing the oil sprayed stone with quartz sand and cement, adding water to mix evenly to obtain cement paste; (4) spreading butter on core mold's inner surface to form a thin butter film, pouring the cement paste into the core mold to obtain a cement sample; (5) loading confining pressure outside the core according to the requirements of porosity and permeability of the mold to adjust a pore permeability value; (6) obtaining the big-model core with microcrack after the cement sample is dried and formed.

Manufacturing method of big-model low-permeability microcrack core

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Hongmei Ren