China University of Petroleum

Southwest Petroleum University

China University of Petroleum (east China)

Yingrui Bai

Jinsheng Sun

Kaihe Lv

Jingping Liu

Jintang Wang

Jiafeng Jin

Xianbin Huang

Jian Li

Meichun Li

Shenglong Shi

Guancheng Jiang

Ren Wang

Chengyuan Xu

Bo Liao

Yang Bai

Fan Liu

Chuan Liu

Xiaohui Sun

Rongchao Cheng

Jingyi Zhang

Ling Lin

Lijun You

Yili Kang

Weian Huang

Xiaosen Shang

He Li

Xinglin Yang

Jiaqi Xu

Jingbin Yang

Mei-Chun Li

Ziyan Li

Junjie Zheng

A polycarboxylate thinner for a carbonate/bicarbonate contamination resistant water-based drilling fluid is prepared from the following raw materials in part by mass: 5 to 10 parts of acrylic acid, 1 to 5 parts of N-vinylpyrrolidone, 5 to 10 parts of sodium methallyl sulfonate, 40 to 50 parts of isopentenyl polyethylene glycol ether, 0.02 to 0.6 part of oxidizing agent, 45 to 55 parts of reducing agent, and 40 to 60 parts of water. The thinner can solve problems caused by HCOand COcontamination in a drilling fluid, such as fluid thickening, increased viscosity and shear force, and elevated fluid loss. When applied to the drilling fluid contaminated with HCOand CO, the thinner can effectively reduce viscosity, shear force, and fluid loss of the drilling fluid.

Polycarboxylate thinner for carbonate/bicarbonate contamination resistant water-based drilling fluid and preparation method and application thereof

A phase change microcapsule for drilling fluid cooling and its preparation method and application, belonging to the field of oilfield chemistry technology; the preparation method of the phase change microcapsule of the invention includes the steps as follows: the core materials of NaNOand KNOare dried, heated, melted, cooled and ground to obtain a phase change material mixture; added emulsifier into the linseed oil, then heated and stirred to obtain the oil phase; the phase change material mixture were added into the suspension of cellulose nanofibers (CNFs), then stirred followed by adding ammonium hydroxide to obtain the water phase; mixed the water phase with the oil phase, heated and stirred to form water-in-oil (W/O) emulsion; then added shell prepolymer material (tetraethyl silicate) into the emulsion, after centrifugation, washing and drying, the phase change microcapsule for cooling drilling fluid was obtained.

Phase change microcapsule for drilling fluid cooling and its preparation method and application

A high-temperature and high-salt resistant hyperbranched lubricant for a water-based drilling fluid, and preparation and application thereof are provided, belonging to the technical field of oilfield chemistry. The preparation method includes the steps of: mixing tetraethyl orthosilicate (TEOS), diethanolamine (DEA), and triethanolamine (TEA) for a transesterification and polycondensation reaction to obtain highly reactive hyperbranched polysiloxane; adding an acrylamide (AM) monomer, an anionic monomer, and a polar ester monomer into deionized water to obtain a monomer solution; adjusting the pH of the monomer solution to 5-9, and then adding highly reactive hyperbranched polysiloxane; introducing nitrogen to remove oxygen, adding an initiator, and thermally initiating a polymerization reaction; and after the reaction is completed, vacuum-drying and crushing an obtained product to obtain the high-temperature and high-salt resistant hyperbranched lubricant for a water-based drilling fluid.

High-temperature and high-salt resistant hyperbranched lubricant for water-based drilling fluid, and preparation and application thereof

A resin slurry for a fractured-vuggy formation and the preparation and use thereof, which belong to the field of drilling fluid lost circulation control. The resin slurry plugging system is composed of the following raw materials in mass percentage: 20%-40% of composite resin plugging agent, 0.5%-5.0% of consolidating agent, 0.5%-5.0% of flow pattern regulator, 0.3%-1.2% of cross-linking agent, 0.3%-1.2% of retarder, 3%-12% of filling agent, and the balance of water. The plugging system has a certain fluidity under low-temperature conditions, is easy to be injected into the formation, and can fill a lose channel of a fractured-vuggy reservoir. The consolidating time of the plugging system is controllable, and the construction conditions are safe. The plugging system forms a three-dimensional cross-linked network structure consolidation after cross-linking and consolidating under high-temperature conditions of the formation.

Resin slurry plugging system suitable for fractured-vuggy formation and preparation and use thereof

Disclosed is a bio-enzyme degradable temporary plugging material and a preparation method and application thereof in the technical field of natural gas hydrate drilling and production; the preparation method of the bio-enzyme degradable temporary plugging material includes the following steps: mixing the ceramsite with an aqueous solution of 3-aminopropyl trimethoxysilane before a stirring reaction and drying to obtain modified ceramsite; and fully dispersing the modified ceramsite, ethyl cellulose, and epoxy resin in dichloromethane to obtain an oil phase; adding the oil phase into a gelatin aqueous solution and mixing uniformly; after a stirring reaction, evaporating an organic solvent, filtering, washing, and drying, to obtain the bio-enzyme degradable temporary plugging material.

Bio-enzyme degradable temporary plugging material and preparation method and application thereof

An oil-soluble thermosensitive resin lost circulation material for protecting a reservoir includes the following raw materials in parts by weight: 40-60 parts of resin matrix, 15-40 parts of modified asphalt, 5-12 parts of viscosity modifier, 2-5 parts of cross-linking agent, 6-15 parts of softening point modifier, and 1-3 parts of dispersant; it further provides a method for preparing the resin lost circulation material; the resin lost circulation material can melt and adhere in different temperature ranges, rapid plugging is realized, and the plugging time is long; the oil-soluble thermosensitive resin lost circulation material can be dissolved by oil flow during oil well production, so that the reservoir permeability is recovered, so as to achieve the purpose of protecting the hydrocarbon reservoir.

Oil-soluble thermosensitive resin lost circulation material for protecting a reservoir as well as preparation method and application thereof

A high temperature and high salinity-resistant complementarily rigid-flexible plugging agent, a method for preparing the same, and a water-based drilling fluid and a use thereof.

High temperature and high salinity-resistant complementarily rigid-flexible plugging agent and method for preparing the same and water-based drilling fluid and use thereof

A nano-organosilicon film-forming and hydrophobic shale surface hydration inhibitor is obtained by performing hydrophobic modification for nano-particles through long-chain organosilicon together with a surface-active agent. A preparation method of the said hydrophobic shale surface hydration inhibitor comprises steps as follows: nano-particles are added to the solvent under stirring conditions, and then an ultrasonic dispersion is performed; upon the end of the ultrasonic dispersion, the reaction system is adjusted to a pH of 9-11 to obtain mixed solution A; a long-chain organosilicon solution is then dropwise added to the mixed solution A for reaction under stirring conditions to obtain mixed solution B; a surface-active agent is added to the mixed solution B for reaction under stirring conditions; upon the reaction is finished, part of the solvent is removed to obtain the inhibitor.

Nano-organosilicon film-forming and hydrophobic shale surface hydration inhibitor and its preparation method and application

The present disclosure to a cementitious plugging wall solidifier for water-based drilling fluid and a preparation method thereof and a water-based drilling fluid.

Cementitious plugging wall solidifer for water-based drilling fluid, and a preparation method thereof and a water-based drilling fluid

The present discloses a water-based gel-consolidation type lost circulation material system suitable for fractured lost circulation formation, preparation method and use thereof.

Water-based gel-consolidation type lost circulation material system suitable for fractured lost circulation formation, preparation method and use thereof

A high-temperature resistant, high-strength, and thixotropic gel plugging agent is composed of 8-20% of acrylamide monomer, 0.05-0.5% of reactive polymer, 0.1-1.0% of organic polymer cross-linker, 3.0-8.0% of resin toughening agent, 1.0-5.0% of flow pattern regulator, 0.01-0.5% of cross-linking regulator by the weight in the water. The gel solution shows a low apparent viscosity during the shear flow and is easy to be pumped into the wellbore and then into the formation leakage layer; after the pumping stops, the gel solution shows rapidly increased viscosity and strong adhesive force, and form a high-strength barrier between the wellbore and the formation, preventing the drilling fluid from further leaking.

High-temperature resistant, high-strength, and thixotropic gel plugging agent and its preparation method and application

The invention relates to a dynamic fracture width calculation method for drilling fluid loss in a fractured formation, which belongs to the field of loss control of drilling and well completion engineering, and includes the following steps: selecting a model according to seismic data and fracture development characteristics and calculating a static hydraulic width of a formation fracture; substituting the static hydraulic width of the formation fracture into a deformation formula of a fracture hydraulic width, to obtain a dynamic hydraulic width of a wellbore fracture; converting the dynamic hydraulic width of the wellbore fracture into an average mechanical width of the wellbore fracture, according to a conversion relational formula of a mechanical width; and solving a mechanical width distribution range of the fracture according to a standard deviation of a mechanical width distribution of a natural fracture.

Dynamic fracture width calculation method for drilling fluid loss in fractured formation

A high temperature-resistant and high oil-absorption resin particle plugging agent suitable for oil-based drilling fluid and its preparation method is prepared from raw materials in parts by mass as follows: 15-30 parts of reaction monomers, 5-12 parts of linear high polymers, 0.1-1.5 parts of cross-linking agents, 0.1-0.5 parts of initiators, 1-3 parts of modified starches, 1-5 parts of filler particles and 1-5 parts of dispersing agents; it has high oil absorption capacity under a high-temperature condition and high toughness after oil-absorbing expansion.

High temperature-resistant and high oil-absorption resin particle plugging agent suitable for oil-based drilling fluid and its preparation method

The present disclosure provides a preparation method of an environment-friendly high-temperature resistant water-based drilling fluid plugging anti-sloughing agent, the preparation method comprises the following steps: mixing and emulsifying a styrene monomer, an acrylic monomer and an emulsifier MS-1 aqueous solution to prepare a pre-polymerization emulsion; dispersing hydrophilic monomer, cationic monomer and an emulsifier MS-1 in water, adjusting the pH to be within a range of 6.5-8.5, then adding mixed monomers of the styrene monomer and acrylic monomer to blend and emulsify to prepare a post-polymerization emulsion; adding a first cross-linking agent and a first initiator into the pre-polymerization emulsion, uniformly dispersing the mixture and carrying out reaction; subsequently dropwise adding the post-polymerization emulsion, adding a second cross-linking agent and a second initiator, uniformly dispersing the mixture and then continuously carrying out reaction, drying and crushing the reaction product to prepare the plugging anti-sloughing agent.

Environment-friendly high-temperature resistant water-based drilling fluid plugging anti-sloughing agent, preparation method thereof and the water-based drilling fluid

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Qingdao, China

Yingrui Bai