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1.发明授权公开(公告)号：US11692423B1
公开(公告)日：2023-07-04
申请号：US17694527
申请日：2022-03-14
Applicant: Southwest Petroleum University
Inventor： Xiyu Chen , Yitao Huang , Yongming Li , Huibo Wen , Yu Peng , Youshi Jiang , Jinzhou Zhao
IPC: E21B43/267 , E21B43/26
CPC classification number: E21B43/261 , E21B43/267 , E21B2200/20
Abstract: The present invention discloses a method for realizing uniform stimulation for the oil and gas well by low-cost multi-stage fracturing, comprising the following steps: first calculate and predict the inlet widths of the fracture created in the planned hydraulic fracturing; then design the plugging scheme for blocking the fracture inlet after each fracturing treatment; the selected plugging particles are composed of filling particles and skeleton particles, with designed plugging scheme; after complete the design of plugging scheme, perform the fracturing treatment to create hydraulic fracturing in the reservoir; skeleton particles and filling particles are added into the fractures successively according to plan. The present invention provides a multi-stage single-cluster fracturing method, with the advantages of controllable fracture sizes and low cost. The present invention can realize a good uniformity of stimulation for the oil and gas wells.
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公开(公告)号：US11280172B2
公开(公告)日：2022-03-22
申请号：US17513923
申请日：2021-10-29
Applicant: SOUTHWEST PETROLEUM UNIVERSITY
IPC: E21B49/00 , E21B43/26 , E21B43/267 , E21B49/08 , G01N3/08
Abstract: The present invention discloses a method for evaluating and preventing creep damage to conductivity of hydraulic fracture in gas reservoirs, comprising: (1) selecting a rock sample of target reservoir for creep experiment, and plotting ε-t curve of the rock sample during creep; (2) fitting the fractional Kelvin model with the ε-t curve of the rock sample during creep; (3) calculating the conductivity and permeability of hydraulic fracture considering creep damage; (4) numerically solving the productivity model, calculating the cumulative gas production of the gas well produced up to time t, and calculating the creep damage rate for cumulative production of the gas well; (5) repeating Steps (3) to (4), calculating the creep damage rate for cumulative production for the cases of hydraulic fracture sanding concentration N of 5 kg/m2, 7.5 kg/m2, 10 kg/m2, 12.5 kg/m2 and 15 kg/m2 respectively, plotting the creep damage chart of cumulative production.
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3.发明授权公开(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
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.
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4.发明授权公开(公告)号：US11614561B1
公开(公告)日：2023-03-28
申请号：US17859240
申请日：2022-07-07
Applicant: Southwest Petroleum University
Inventor： Yongming Li , Tai Chang , Yu Peng , Huohai Yang , Guowei Deng , Juhui Zhu , Cheng Chang
Abstract: A glass clamping model based on microscopic displacement experiment, including a frame, a transparent silicone sleeve having a horizontal through hole, a piston, a piston cap arranged on the frame, a connecting plate, a screw compression bracket, a clamp support, a glass sheet entirety placed in the transparent silicone sleeve, a boss, a light source and a microscope. The transparent silicone sleeve is sheathed on the piston cap, the piston penetrates through the horizontal penetration hole; the connecting plate and the clamp support are respectively connected to both ends of the frame, the end of the screw compression bracket is clamped between the frame and the connecting plate, and the piston and the frame are connected with the clamp support; an emptying channel and an inlet passage are respectively arranged at both ends of the piston, and an outlet passage is arranged at an end of the piston.
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5.发明申请公开(公告)号：US20210047925A1
公开(公告)日：2021-02-18
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
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.
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Patent Agency Ranking
公开(公告)号：US12060519B1
公开(公告)日：2024-08-13
申请号：US18603436
申请日：2024-03-13
Applicant: Southwest Petroleum University
Inventor： Yu Peng , Jiandu Ye , Yongming Li , Pengfei Chen , Pengjun Shi
IPC: C09K8/42
CPC classification number: C09K8/426
Abstract: The present invention discloses a plant-based self-degradable gel diverting agent and a preparation method therefor. The preparation method comprises the following steps: adjusting a pH of a formaldehyde solution, adding urea in three batches, heating and stirring, adding furfural in the process of adding a second batch of urea until a plant-based urea-formaldehyde resin is obtained through the reaction, completely dissolving starch in water, uniformly stirring to obtain a gelatinized starch solution, adding the plant-based urea-formaldehyde resin, adding a curing agent, and uniformly stirring, mixing and curing to obtain a product. The resin plugging agent is a liquid homogeneous system and has a low initial viscosity; the system is particle-free, can enter tiny slits; and the gel temporary plugging agent does not need to be added with a gel breaker at a temperature of 100-180° C., the temporary plugging agent can be completely degraded.
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7.发明授权公开(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.
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公开(公告)号：US11767746B2
公开(公告)日：2023-09-26
申请号：US17512684
申请日：2021-10-28
Applicant: Southwest Petroleum University
Inventor： Yongming Li , Tai Chang , Yu Peng , Yibo Li , Ang Luo , Shuxuan Li
CPC classification number: E21B43/34 , B01D46/62 , B01D53/48 , B01D53/62 , B01D2257/104 , B01D2257/30 , B01D2257/504
Abstract: An integrated wellhead device for filtering injected and produced gases is provided. The wellhead device comprises a horizontal tank body that is internally provided with an injected gas filtering system and a produced gas filtering system. The injected gas filtering system is internally provided with an oxygen removal chamber. A gas inlet of the injected gas filtering system is connected with an injected high-pressure gas source, and a gas outlet of the injected gas filtering system is connected with a gas injection well casing of Christmas tree. The produced gas filtering system is internally equipped with an oxygen removal chamber, a sulfur removal chamber and a carbon dioxide removal chamber. A gas inlet of the produced gas filtering system is connected with a gas production tubing of the Christmas tree, and a gas outlet of the produced gas filtering system is connected with a produced gas transmission pipe.
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公开(公告)号：US11604132B1
公开(公告)日：2023-03-14
申请号：US17837499
申请日：2022-06-10
Applicant: Southwest Petroleum University
Inventor： Yu Peng , Yitao Huang , Yongming Li , Ang Luo , Pengjun Shi
Abstract: The present invention discloses a testing device and evaluation method for sensitivity damage of core permeability tensor, comprising the following steps: first, obtain the cubic experimental rock samples and calculate the formation pressure distribution based on the reservoir geological data; then simulate the true stress and strain state of core in formation through triaxial stress loading, design the acid liquor, alkali liquor, inorganic salt solution, formation water and different displacement rates for displacement experiments, realize the determination of core three-directional permeability tensor under the same experimental conditions through three-directional sequential displacement, process the experimental data through Darcy's law, and calculate the damage degree of core permeability tensor under different sensitivity conditions of triaxial stress state; finally, identify the real-time flow state of fluid through permeability tensor synthesis, and realize the accurate and efficient testing and evaluation on permeability tensor sensitivity of reservoirs.
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10.发明授权公开(公告)号：US11598205B1
公开(公告)日：2023-03-07
申请号：US17837545
申请日：2022-06-10
Applicant: Southwest Petroleum University
Inventor： Yu Peng , Ang Luo , Yongming Li , Pengjun Shi , Hu Jia , Cheng Chang
Abstract: The present invention discloses a method for comprehensive evaluation of shale fracability under the geology-engineering “double-track” system, comprising the following steps: S1: Divide the target horizontal fracturing interval into multiple sampling sections; S2: Establish the reservoir property evaluation factor of each sampling section, and calculate the geological evaluation index of the target horizontal fracturing interval according to the reservoir property evaluation factor of each sampling section; S3: Establish the brittleness factor, natural fracture factor and natural fracture opening factor of each sampling section, and then establish the engineering evaluation index of each sampling section according to these factors; S4: Calculate the engineering evaluation index of the target horizontal fracturing interval according to the engineering evaluation factor of each sampling section; S5: Evaluate the fracability of the target horizontal fracturing interval according to the geological evaluation index and the engineering evaluation index.
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