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公开(公告)号：US11536123B1
公开(公告)日：2022-12-27
申请号：US17694508
申请日：2022-03-14
Applicant: Southwest Petroleum University
Inventor： Wanfen Pu , Lin Sun , Jianyong Xie , Shishi Pang , Yan Shi , Yanjie Chu , Rui Liu , Daijun Du
Abstract: The present invention discloses a method for enhancing the recovery factor of heavy oil by in-situ oil-water emulsion with high phase inversion point, and the method is aimed at the development of heavy oil reservoir by water injection under the condition that the performance parameters of crude oil emulsion meet the following three specific requirements: (A) The viscosity of the crude oil is less than 6,000 mPa·s; (B) At the reservoir temperature, the phase inversion point of the crude oil emulsion is greater than or equal to 70%, and the emulsion viscosity corresponding to the phase inversion point is 2-6 times of the crude oil viscosity; (C) At the reservoir temperature, when the water cut is less than or equal to the phase inversion point, the flow rate ratio of crude oil emulsion to crude oil is 0.2 to 0.9.
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公开(公告)号：US20210115317A1
公开(公告)日：2021-04-22
申请号：US17070943
申请日：2020-10-15
Applicant: Southwest Petroleum University
Inventor： Fayang Jin , Daijun Du , Wanfen Pu , Xiang Li , Ye Ju , Kexing Li , Lin Sun , Rui Liu , Shuyu Song , Mian Wang , Wei Liao , Desheng Qian
Abstract: A particulate profile control agent self-adaptive to a size of formation pore throat and a preparation method thereof include: raw materials and mass fraction for preparing a system including a main agent of 0.04˜0.2%, a nucleating agent of 0.005˜0.01%, a crosslinking agent of 0.002˜0.04%, an additive of 0.005˜0.01% and water. The preparation method includes: adding the main agent in proportion to the water and evenly mixing the mixture of the main agent and the water, and then adding the additive, the crosslinking agent and the nucleating agent in turn so as to form the profile control agent; pumping the profile control agent into the formation to be reacted at a reservoir temperature for a period of time to form colloidal particles on the spot for sealing off a high-permeability layer. The present disclosure is of easy operation and low cost, low initial viscosity and good injectivity.
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公开(公告)号：US11702585B2
公开(公告)日：2023-07-18
申请号：US17900822
申请日：2022-08-31
Applicant: Southwest Petroleum University
Inventor： Daijun Du , Huancai Fan , Wanfen Pu , Rui Liu , Fayang Jin , Lin Sun , Binyang Zou , Bowen Chen
CPC classification number: C09K8/588 , C09K8/594 , C09K2208/10
Abstract: A tight oil reservoir CO2 flooding multi-scale channeling control system and a preparation method, including nanoscale CO2 responsive worm-like micellar systems and micron-scale CO2 responsive dispersion gel, are provided. The nanoscale CO2 responsive worm-like micelle system is prepared by CO2 reactive monomers and organic anti-ion monomers stirred in water. The micron-scale CO2 responsive dispersion gel is made of acrylamide, a responsive monomer, a silane coupling agent modified hydroxylated multi-walled carbon nanotubes as raw materials, cross-linked in water. The tight oil reservoir CO2 multi-scale channel control system, has strong flow control ability during CO2 displacement, and high-strength carbon nanotubes are introduced into the micro-scale CO2 responsive dispersion gel, which effectively improves the strength and long-term stability of the dispersion gel, significantly enhances the sealing effect on cracks, and after displacement of the CO2 of the system, the worm-like micelles revert to spherical micelles with good responsive reversibility.
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公开(公告)号：US11015109B2
公开(公告)日：2021-05-25
申请号：US17070943
申请日：2020-10-15
Applicant: Southwest Petroleum University
Inventor： Fayang Jin , Daijun Du , Wanfen Pu , Xiang Li , Ye Ju , Kexing Li , Lin Sun , Rui Liu , Shuyu Song , Mian Wang , Wei Liao , Desheng Qian
Abstract: A particulate profile control agent self-adaptive to a size of formation pore throat and a preparation method thereof include: raw materials and mass fraction for preparing a system including a main agent of 0.04˜0.2%, a nucleating agent of 0.005˜0.01%, a crosslinking agent of 0.002˜0.04%, an additive of 0.005˜0.01% and water. The preparation method includes: adding the main agent in proportion to the water and evenly mixing the mixture of the main agent and the water, and then adding the additive, the crosslinking agent and the nucleating agent in turn so as to form the profile control agent; pumping the profile control agent into the formation to be reacted at a reservoir temperature for a period of time to form colloidal particles on the spot for sealing off a high-permeability layer. The present disclosure is of easy operation and low cost, low initial viscosity and good injectivity.
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Patent Agency Ranking
公开(公告)号：US11268013B2
公开(公告)日：2022-03-08
申请号：US16961562
申请日：2019-07-30
Applicant: Southwest Petroleum University
Inventor： Rui Liu , Wanfen Pu , Daijun Du , Lin Sun , Shishi Pang
Abstract: An in-situ emulsification and viscosity increase system with controllable viscosity consists of the following components in percentage by weight: 0.3˜1.5% of emulsifier, 0.05˜0.5% of ultrafine colloidal particles, 0.01˜0.1% of suspending agent and the balance of mineralized water. The emulsifier is one of or a combination of petroleum sulfonate, petroleum carboxylate, sodium dodecyl sulfate, sodium dodecyl benzenesulfonate, alkyl glycoside, aliphatic alcohol ether carboxylate, aliphatic alcohol ether sulfonate, hydroxysulfobetaine and alkanolamide. The ultrafine colloidal particles are one of ultrafine silicon dioxide, ultrafine montmorillonoid, ultrafine ferric oxide, ultrafine ferroferric oxide, ultrafine aluminum oxide and ultrafine titanium dioxide. The suspending agent is one of partially hydrolyzed polyacrylamide, amylose, carboxymethyl chitosan, hydroxymethyl cellulose, xanthan gum and sodium alginate. The system is applicable to a water-flooding oil reservoir with the viscosity of lower than 50 mPa·s, has a very broad coverage scope and outstanding economic benefits and can effectively promote efficient development of water-flooding oil reservoirs.
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公开(公告)号：US11618847B2
公开(公告)日：2023-04-04
申请号：US17235903
申请日：2021-04-20
Applicant: SOUTHWEST PETROLEUM UNIVERSITY
Abstract: The present disclosure discloses methods for preparing an in-situ nano emulsifier. The preparation method may include obtaining a solution by dissolving hydrated ferric chloride (or ferric chloride) and hydrated ferrous sulfate (or ferrous sulfate) into deionized water at a first temperature; obtaining an ethanol solution dissolved with an oil-soluble surfactant by dissolving an oil-soluble surfactant into ethanol at a second temperature; and adding a certain volume of ammonia water and the ethanol solution dissolved with the oil-soluble surfactant in the solution to obtain an in-situ nano emulsifier. The in-situ nano emulsifier may be applied to development of the oil reservoir through an application process. The application process may include preparing a nano emulsifier solution and a surfactant solution; sequentially injecting the surfactant solution and the nano emulsifier solution into a formation; and injecting a spacer liquid slug into the formation for replacement.
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公开(公告)号：US11473005B2
公开(公告)日：2022-10-18
申请号：US16961192
申请日：2019-07-30
Applicant: Southwest Petroleum University
Inventor： Wanfen Pu , Rui Liu , Shishi Pang , Lin Sun , Daijun Du
Abstract: The present invention discloses an in-situ emulsification and viscosity increase system with a high phase change point. The system consists of the following components in percentage by weight: 0.2˜0.5% of water-soluble surfactant, 0.2˜1.5% of oil-soluble surfactant, 0.02˜0.5% of lipophilic colloidal particles, 0.02˜0.2% of carrying agent and the balance of mineralized water. The water-soluble surfactant is one of or a combination of petroleum sulfonate, cocamidopropyl betaine, fatty alcohol ether sulfonate, alkanolamide and alkyl glycoside; the oil-soluble surfactant is one of or a combination of propylene glycol monostearate, fatty glyceride, polyoxyethylene sorbitan monostearate, polyoxyethylene fatty alcohol ether, oleic diethanolamide, dodecylamine, octadecyl primary amine, sodium oleate and petroleum acid; the lipophilic colloidal particles are one of liquid paraffin, graphite powder and polyhedral oligomeric silsesquioxane; the carrying agent is one of carboxymethyl-β-cyclodextrin, chitosan quaternary ammonium salt, chitosan hydrochloride, xanthan gum and guar gum. The system is used for water-flooding oil reservoirs and can significantly improve the development effect of water-flooding heavy oil reservoirs.
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公开(公告)号：US11279621B1
公开(公告)日：2022-03-22
申请号：US17408511
申请日：2021-08-23
Applicant: Southwest Petroleum University
IPC: C01B32/198 , C09K8/58 , B82Y40/00 , B82Y30/00
Abstract: An amphoteric two-dimensional nanosheet and a preparation method thereof are provided. The amphoteric two-dimensional nanosheet is prepared by the following steps: uniformly dispersing few-layered graphene oxide into toluene and then adding alkylamine coupling agent to a mixture of the few-layered graphite oxide and the toluene for reaction; amine terminated graphite oxide dispersion that has been prepared is fully dispersed in toluene-dimethylformamide mixed solvent, and then, alkyl glycidyl ether is added into the above solution for reaction, so as to obtain the amphoteric two-dimensional nanosheet. The amphoteric two-dimensional nanosheet of the present disclosure can be prepared by modifying two-dimensional graphite oxide, to spontaneously form water-in-oil Pickering emulsion at an oil-water interface, compared with emulsion of conventional surfactants, the present disclosure can effectively stabilize the waterflooding front, improve the sweep volume of waterflooding, have a simple synthesis process for convenient large-scale production, and be widely used in waterflooding development reservoirs.
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公开(公告)号：US10889745B1
公开(公告)日：2021-01-12
申请号：US17020854
申请日：2020-09-15
Applicant: SOUTHWEST PETROLEUM UNIVERSITY
Inventor： Fa Yang Jin , Wan Fen Pu , Wen Ge Hu , Hai Yang Zhao , Long He , Dai Jun Du , Ke Xing Li , Bao Lei Jiao , Bo Ren , Lin Sun , Zhen Qian , En Long Zhen , Rui Liu , Xiao Qing He
Abstract: A plugging agent with temperature-resistant, salt-resistant and high-expansion for plugging large fractures and a preparation method thereof of the present disclosure are provided, the plugging agent system consists of the following components: main agent: 6%˜10%, cross-linking agent: 0.6%˜1%, initiator: 0.006%˜0.01%, additive: 6%˜14%, and the rest being water; the preparation method includes the following steps: adding montmorillonite to water to prepare a montmorillonite dispersion system; adding the main agent, the cross-linking agent and the initiator to the montmorillonite dispersion system to prepare a main agent solution; putting the main agent solution into an oven with a temperature range with 90˜20° C. for 9˜48 h to obtain gelation, the adhesive strength of the agent system can reach grade H, with 50˜80 expansion multiple, good strength after being expanded and good water plugging effect under the condition of a temperature of 140° C. and 250,000 degree of mineralization.
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