公开(公告)号：US11747260B2

公开(公告)日：2023-09-05

申请号：US17087647

申请日：2020-11-03

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Yonggang Duan ,  Zhenglan Li ,  Quantang Fang ,  Mingqiang Wei ,  Yu Peng ,  Shihao Wei ,  Zijian Wu ,  Shuyao Sheng

IPC: G01N15/08 ,  E21B49/08 ,  E21B49/02 ,  G06T17/05 ,  G06T17/00

CPC classification number: G01N15/088 ,  E21B49/02 ,  E21B49/0875 ,  G01N15/0826 ,  G06T17/00 ,  G06T17/05 ,  G01N2015/0846

Abstract: The invention discloses a digital imaging technology-based method for calculating relative permeability of tight core, comprising the following steps: step S1: preparing a small column sample of tight core satisfying resolution requirements; step S2: scanning the sample by MicroCT-400 and establish a digital core; step S3: performing statistical analysis on parameters reflecting the characteristics of rock pore structure and shape according to the digital core; step S4: calculating tortuosity fractal dimension DT and porosity fractal dimension Df by a 3D image fractal box dimension algorithm; step S5: performing statistical analysis on maximum pore equivalent diameter λmax and minimum pore equivalent diameter λmin by a label. The present invention solves the problems of time consumption of experiment, instrument accuracy, incapability of repeated calculation simulations and resource waste by repeated physical experiment.

公开(公告)号：US12180409B1

公开(公告)日：2024-12-31

申请号：US18824209

申请日：2024-09-04

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Yu Peng ,  Pengjun Shi ,  Yongming Li ,  Zhenglan Li ,  Jiandu Ye ,  Jinzhou Zhao

IPC: C08F220/06 ,  C08F220/20 ,  C08F220/58 ,  C09K5/06 ,  C09K8/00 ,  C08K3/34 ,  C08K3/38 ,  C09K8/24 ,  C09K8/512

Abstract: The present invention discloses a double-crosslinked thermal phase transition gel temporary plugging agent and an application thereof, and relates to the technical field of oil and gas field development. The gel temporary plugging agent comprises the following components in percentage by weight: 5.8-18.3% of acrylic acid, 2.8-6.5% of 2-acrylamide-2-methylpropanesulfonic acid, 2.8-7.0% of hydroxyethyl acrylate, 0.2-1.0% of a degradable crosslinking agent, 0.4-1.2% of borax or boric acid, 0.2-0.8% of a high-temperature initiator, 2.6-4.5% of palygorskite attapulgite, 1.5-3.1% of a urea-formaldehyde resin, and the balance of water, wherein the gel temporary plugging agent is formed by underground gelation. The gel temporary plugging agent is applied to oil and gas reservoirs with a temperature of 100-150° C., can automatically be subjected to gelation and degradation, and has a low filtration loss before gelation.

公开(公告)号：US12092592B2

公开(公告)日：2024-09-17

申请号：US18148661

申请日：2022-12-30

Applicant: Southwest Petroleum University

Inventor： Zhenglan Li ,  Yonggang Duan ,  Mingqiang Wei ,  Quantang Fang ,  Le Luo ,  Keyi Ren ,  Lei Meng ,  Shuxin Li ,  Zhihong Nie

IPC: G01N15/08 ,  G01N23/046 ,  G01N23/083 ,  G01N33/24

CPC classification number: G01N23/046 ,  G01N15/0806 ,  G01N15/082 ,  G01N23/083 ,  G01N33/24 ,  G01N2223/04 ,  G01N2223/419 ,  G01N2223/616

Abstract: The present invention discloses a device and method for measuring the relative permeability of propped fractures in shale considering probability distribution, comprising a gas cylinder, a water pump, a booster pump, a rock slab holder, a differential pressure sensor, a directional X-ray source, an X-ray detector, an X-ray shielding box, a tee, a liquid meter, a gas meter, an electronic balance, and a vacuum pump; the inlet of rock slab holder is respectively connected with the gas cylinder and the water pump by the pipe, the outlet is connected with the liquid meter and the vacuum pump by the tee, and the differential pressure sensor is connected with both ends of the rock slab holder; the booster pump is connected with the rock slab holder by the pipe; the inlet of the gas meter is connected with the liquid meter, and the outlet is connected to the external atmosphere.

公开(公告)号：US11513051B1

公开(公告)日：2022-11-29

申请号：US17854415

申请日：2022-06-30

Applicant: Southwest Petroleum University

Inventor： Mingqiang Wei ,  Yonggang Duan ,  Quantang Fang ,  Zhenglan Li ,  Le Luo ,  Keyi Ren ,  Xin Wang ,  Shuxin Li ,  Zhihong Nie

IPC: G01N15/08 ,  G01N33/24

Abstract: The present invention discloses a shale stress sensitivity testing device and method. The testing device comprises a support table. The left and right ends of the upper surface of the support table are respectively provided with a left side plate and a right side plate. The top of the left and right side plates are connected with the left and right ends of the top plate. The chucks of the clamps are capable of reciprocating motion in the horizontal direction and circular motion in the front-rear direction. The present invention can change the intensity and direction of the effective stress of the rock sample, and determine the permeability of the rock sample under different effective stresses, thus enabling comprehensive testing of the stress sensitivity of shale in different directions and enhancing the accuracy of shale stress sensitivity testing.