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1.发明申请公开(公告)号：US20200300082A1
公开(公告)日：2020-09-24
申请号：US16899546
申请日：2020-06-11
发明人： Pingli Liu , Xiang Chen , Heng Xue , Honglan Zou , Liqiang Zhao , Nianyin Li , Daocheng Wang , Zhifeng Luo , Juan Du , Chong Liang , Mingyue Cui , Fei Liu , Changlin Zhou , Rong Zeng
摘要： The invention discloses a calculation method for dynamic fluid loss of acid-etched fracture considering wormhole propagation, which is applied to pad acid fracturing process, comprising the following steps: Step 1: dividing the construction time T of injecting acid fluid into artificial fracture into m time nodes at equal intervals, then the time step Δt=T/m and tn=nΔt, where, n=0, 1, 2, 3, . . . , m, and to is the initial time; Step 2: calculating the fluid loss velocity vl(0) in the fracture at t0; Step 3: calculating the flowing pressure distribution P(n) in the fracture at tn; Step 4: calculating the width wa(n) of acid-etched fracture at tn; Step 5: calculating the wormhole propagation and the fluid loss velocity vl(n) at tn; Step 6: substituting the fluid loss velocity vl(n) into Step 3, and repeating Step 3 to Step 6 in turn until the end of acid fluid injection.
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公开(公告)号：US10301919B2
公开(公告)日：2019-05-28
申请号：US15775384
申请日：2016-09-20
发明人： Liqiang Zhao , Yong Yang , Zhifeng Luo , Donghe Yu , Juan Du , Guohua Liu , Hang Che , Guangyan Du , Yuxin Pei , Nianyin Li , Pingli Liu , Kun Xu , Bingxiao Liu
摘要： A phase-change hydraulic fracturing process, including the following steps: (1) injecting clean water or conventional fracturing fluid to a formation, so that the formation fractures; (2) placing non-phase-change liquid and phase-change liquid in different liquid mixing tanks and injecting into a shaft at the same time, an injection volume ratio of the non-phase-change liquid to the phase-change liquid is (0-0.7):(0.3-1); (3) injecting a displacement fluid into the shaft, so that the non-phase-change liquid and the phase-change liquid in the shaft completely enter a reservoir; (4) performing well shut-in and pressure-out for 30-200 min, so that solid-phase matters generated by the phase-change liquid are laid in the fracture; and (5) relieving pressure to finish the construction.
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公开(公告)号：US11781062B1
公开(公告)日：2023-10-10
申请号：US17844731
申请日：2022-06-21
发明人： Pingli Liu , Jun Li , Jian Yang , Jianfa Wu , Shang Gao , Xingwu Guo , Jian Zou , Xitang Lan , Liping Zhang , Zhifeng Luo , Lan Ren , Changlong Liu , Juan Du , Xiang Chen , Nianyin Li , Peng Wang
CPC分类号： C09K8/80 , C09K8/605 , C09K8/608 , C09K8/68 , C09K2208/08 , C09K2208/10 , C09K2208/28
摘要： The present invention relates to a bionics-based efficiently transported and packed proppant and preparation method thereof, comprising enhanced fracturing fluid and biomimetic dandelion proppant; the mass ratio of the enhanced fracturing fluid and the biomimetic dandelion is: 1-2:100-400; the 100 pbw of enhanced fracturing fluid includes 0.1-1 pbw of drag reducing agent, 0.01-0.1 pbw of cleanup additive, 0.2-0.8 pbw of clay stabilizer, 0.01-0.05 pbw of bactericide, 0.01-0.2 pbw of nanoparticle enhancer, and water; the biomimetic dandelion proppant consists of modified proppant and modified fiber, and the mass ratio between the modified proppant and the modified fiber is 99-99.9:0.1-1.
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公开(公告)号：US11187250B2
公开(公告)日：2021-11-30
申请号：US17344952
申请日：2021-06-11
发明人： Ruyi Gou , Weiyu Chen , Liqiang Zhao , Pingli Liu , Zhifeng Luo , Juan Du
摘要： The present invention relates to an automatic cleaning device for suction port of electric submersible pump. The pipe string joint is connected between the oil pipe and the electric submersible pump. A plurality of oil drain passage inlets, steel balls, return springs, sealing plugs and oil drain passage outlets are evenly distributed in circumferential direction of a boss. The upper end of the connecting pipe is connected with the outlet of the oil drain passage, and the lower end is connected with the nozzle. The retaining ring secures the connecting pipe on the housing of the electric submersible pump. A high-pressure fluid ejected from the nozzle directly acts on the suction port of the electric submersible pump. The present invention can automatically clean the suction port of the electric submersible pump by relying on the pressure difference between the outlet and the suction port of the electric submersible pump.
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公开(公告)号：US11174425B2
公开(公告)日：2021-11-16
申请号：US16910807
申请日：2020-06-24
发明人： Weiyu Chen , Liqiang Zhao , Zhifeng Luo , Juan Du , Pingli Liu , Nianyin Li , Kun Xu
摘要： The present invention relates to a carbonate reservoir filtration-loss self-reducing acid fracturing method. The carbonate reservoir filtration-loss self-reducing acid fracturing method comprises the steps: (1) calculating a fracture pressure and a fracture extension pressure of a reconstructed reservoir; (2) injecting an agent A into a stratum under a pressure higher than the stratum fracture pressure, so that fractures are generated on the stratum; (3) injecting an agent B into the stratum under a pressure higher than the stratum fracture pressure, such that the agent B extends the fractures and communicates with a natural fracture net; (4) pumping an acid liquor system agent C with a high etching power into the stratum under a pressure higher than the extension pressure but lower than the fracture pressure to improve the conductivity of the fractures; (5) injecting a displacing liquid agent D under a pressure lower than the stratum fracture pressure to jack acid liquor in a well casing into the stratum; and (6) shutting down a well and performing flow-back. The agent A is a gel acid or VES acid, the agent B is a filtration-loss self-reducing gel acid or filtration-loss self-reducing VES acid, the agent C is closed acid, and the agent D is a displacing liquid. According to the method of the present invention, precipitation type solid filter cakes are formed on wall surfaces of the fractures by utilizing a filtration-loss self-reducing system, so as to perform temporary blocking to reduce the filtration loss. The technology is simple with easy injection, and the filtration-reducing agent is easy to disperse and flow back, and the method is safe and environment-friendly.
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公开(公告)号：US20210301835A1
公开(公告)日：2021-09-30
申请号：US17344952
申请日：2021-06-11
发明人： Ruyi Gou , Weiyu Chen , Liqiang Zhao , Pingli Liu , Zhifeng Luo , Juan Du
摘要： The present invention relates to an automatic cleaning device for suction port of electric submersible pump. The pipe string joint is connected between the oil pipe and the electric submersible pump. A plurality of oil drain passage inlets, steel balls, return springs, sealing plugs and oil drain passage outlets are evenly distributed in circumferential direction of a boss. The upper end of the connecting pipe is connected with the outlet of the oil drain passage, and the lower end is connected with the nozzle. The retaining ring secures the connecting pipe on the housing of the electric submersible pump. A high-pressure fluid ejected from the nozzle directly acts on the suction port of the electric submersible pump. The present invention can automatically clean the suction port of the electric submersible pump by relying on the pressure difference between the outlet and the suction port of the electric submersible pump.
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公开(公告)号：US10364388B2
公开(公告)日：2019-07-30
申请号：US15775009
申请日：2016-09-20
发明人： Liqiang Zhao , Yong Yang , Guangyan Du , Donghe Yu , Juan Du , Hang Che , Zhifeng Luo , Guohua Liu , Yuxin Pei , Nianyin Li , Pingli Liu , Kun Xu
摘要： The present invention discloses a phase change fracturing fluid system for phase change fracturing, including the following components in percentage by weight: 10%-40% of supramolecular construction unit, 0-40% of supramolecular function unit, 0.5%-2% of surfactant, 0-5% of inorganic salt, 0.5%-2% of oxidizing agent, 0-2% of cosolvent and the remaining of solvent. The supramolecular construction unit is melamine, triallyl isocyanurate, or a mixture thereof. The supramolecular function unit is vinyl acetate, acrylonitrile, or a mixture thereof. The solvent is methylbenzene, ethylbenzene, o-xylene, m-xylene or p-xylene. In the fracturing construction process, a conventional fracturing fluid is used for fracturing a formation first; the phase change fracturing fluid is then injected into the formation, or the phase change fracturing fluid and other fluids which cannot be subjected to phase change are injected into the formation together.
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公开(公告)号：US12116437B1
公开(公告)日：2024-10-15
申请号：US18590881
申请日：2024-02-28
发明人： Pingli Liu , Chengjie Wang , Jinzhou Zhao , Juan Du , Xiang Chen , Xianyu Song , Guan Wang
IPC分类号： C08F220/38 , C10G75/04
CPC分类号： C08F220/387 , C10G75/04 , C10G2300/4075
摘要： The present invention provides an asphaltene dispersion stabilizer and a preparation method therefor, and relates to the technical field of oilfield additives. The asphaltene dispersion stabilizer is prepared by the following method: taking iminodisuccinic acid or salt thereof, and performing Michael addition reaction on the iminodisuccinic acid or the salt thereof and unsaturated sulfonate to prepare a first intermediate; taking the first intermediate, and performing amidation reaction on the first intermediate and a first monomer under the action of a catalyst to obtain a second intermediate; and preparing a dendrimer by taking the second intermediate as a core and taking a second monomer and a third monomer as raw materials, wherein the dendrimer is the asphaltene dispersion stabilizer, and the generation number of the dendrimer is 0.5 generations, 1.5 generations or 2.5 generations. The asphaltene dispersion stabilizer of the present invention has a good dispersion stabilization effect on asphaltene.
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公开(公告)号：US10982131B2
公开(公告)日：2021-04-20
申请号：US16365765
申请日：2019-03-27
发明人： Shubao Hu , Yong Yang , Liqiang Zhao , Guohua Liu , Mengmeng Ning , Kun Xu , Juan Du , Ning Li , Lina Zhang , Yuanzhao Jia
摘要： Provided are a phase transition material fluid and a proppant formed therefrom, wherein the components for preparing the phase transition material fluid comprise in percentages by mass: a supramolecular building block 10 to 60 wt %, a supramolecular functional unit 20 to 50 wt %, a dispersant 0.1 to 2 wt %, an inorganic co-builder 0.1 to 1 wt %, an initiator 0.1 to 1 wt %, the balance being a solvent. The supramolecular building block comprises a melamine-based substance and/or a triazine-based substance; the supramolecular functional unit comprises a dicyclopentadiene resin; and the dispersant includes a hydroxyl-bearing polysaccharide substance and a surfactant. After the phase transition material fluid enters the reservoir, it may form a solid substance to prop the fracture under the action of supramolecular chemistry and physics.
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