公开(公告)号：US12163905B2

公开(公告)日：2024-12-10

申请号：US18167712

申请日：2023-02-10

Applicant: Southwest Petroleum University

Inventor： Ping Guo ,  Zheng Gu ,  Shuoshi Wang ,  Zhouhua Wang ,  Qinglong Xu ,  Shiyong Hu ,  Wenhua Zhao ,  Yisheng Hu ,  Huang Liu ,  Hanmin Tu

IPC: G01N24/08 ,  G01N1/42 ,  G01N1/44

Abstract: A method for determining a phase-state type and saturation of a fluid by an NMR technology includes putting a core to be measured to an NMR phase-state testing device, injecting a heavy water solution from both ends of a gripper at the same time until the core reaches the formation pressure, and stopping; scanning the core to obtain a two-dimensional NMR map, and determining whether the core contains a gas phase; reducing the temperature of the gripper, and collecting an oil phase volume, a gas phase volume and a water phase volume discharged from the core; purge the pipelines out with nitrogen, collecting a water phase volume and an oil phase volume in the pipelines; performing dry distillation on the core to obtain an oil phase volume and a water phase volume; and obtaining the saturations of various phases according to the fluid volumes of multiple phases in the core.

公开(公告)号：US12092558B1

公开(公告)日：2024-09-17

申请号：US18678292

申请日：2024-05-30

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Zhouhua Wang ,  Hanmin Tu ,  Xintong Zhang ,  Ping Guo ,  Shuoshi Wang ,  Huang Liu ,  Zhicheng Yang ,  Xingliang Deng ,  Zhiliang Liu ,  Yisheng Hu ,  Hongnan Yang ,  Ping Le ,  Tongwen Jiang ,  Guangya Zhu ,  Nan Li

IPC: G01N15/08 ,  E21B49/08

CPC classification number: G01N15/0826 ,  E21B49/087 ,  G01N2203/0044

Abstract: The present invention discloses a gas based testing method for a pore volume compressibility of a low-permeability rock. The method comprises the following steps: obtaining a compressibility and an isothermal adsorption-desorption curve of experimental gas under a reservoir condition; performing a physical simulation experiment by using a steel core drilled with a through hole, and obtaining a gas volume collected due to the deformation of an experimental instrument; then repeating the experiment by using an actual core with the same size, and obtaining pore volumes of the reservoir core under the experimental conditions by deducting deformation of the instrument; and finally, obtaining a pore compressibility of the reservoir core under different reservoir conditions according to the pore volumes of the reservoir core under different reservoir conditions. The present invention considers gas adsorption, corrects errors caused by deformation of a physical simulation device.

公开(公告)号：US10364184B2

公开(公告)日：2019-07-30

申请号：US15749780

申请日：2017-02-14

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Ping Guo ,  Shuai Wu ,  Yijian Chen ,  Huimin Zhang ,  Wanbo Zhang ,  Yuhong Du ,  Zhouhua Wang ,  Jianfen Du ,  Yisheng Hu ,  Huang Liu ,  Hongmei Ren

IPC: C04B20/10 ,  C04B28/04 ,  C04B14/04 ,  C04B40/00 ,  G01N1/28 ,  C04B14/06 ,  B28B7/38 ,  C04B111/00 ,  C09K8/46

Abstract: 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° 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.

公开(公告)号：US11459880B2

公开(公告)日：2022-10-04

申请号：US16839692

申请日：2020-04-03

Applicant: Southwest Petroleum University

Inventor： Yisheng Hu ,  Xuan Bai ,  Ping Guo ,  Jianfen Du ,  Zhouhua Wang ,  Huang Liu

IPC: E21B49/00 ,  E21B43/16 ,  E21B47/06 ,  G01V99/00

Abstract: The invention discloses a method for evaluating the difference in gas injection effect of gas injection wells in a carbonate reservoir, aiming at solving the problem that the difference in effect characters of gas injection wells cannot be systematically evaluated in the prior art, and realizing the purposes of systematically and completely evaluating the difference in gas injection effect in the carbonate reservoir and finding out the reason of low efficiency. By means of the invention, reasons for low gas injection efficiency corresponding to different geological classifications are obtained, systematic classification and induction are carried out on the difference in gas injection effect, and gas injection effects are effectively evaluated, so that a sufficient gas injection scheme design basis is provided for subsequent development and production increase, and a significant guiding principle is provided for later-stage gas injection and production increase of the carbonate reservoir.

公开(公告)号：US10746638B2

公开(公告)日：2020-08-18

申请号：US15775391

申请日：2016-12-02

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Ping Guo ,  Shuai Wu ,  Wanbo Zhang ,  Yisheng Hu ,  Yijian Chen ,  Huimin Zhang ,  Zhouhua Wang ,  Jianfen Du ,  Huang Liu ,  Hongmei Ren

IPC: G01N15/08 ,  G01N1/36 ,  G01N33/24 ,  G01N1/28

Abstract: 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 φ, permeability K, oil saturation So, water saturation Sw and the like of a fractured core to be manufactured; (2) preparing simulated oil, and determining the used oil mass mo=Vo×ρo; (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 mw of water for manufacturing the core as mw=a−Vo×ρw; (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.