Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province

Chengdu, China

Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province

Chengdu, China
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Dai S.,Southwest Petroleum University | Dai S.,Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province | Liu Y.,Southwest Petroleum University | Zhang J.,Southwest Petroleum University | And 3 more authors.
Composite Interfaces | Year: 2017

The interaction between acrylamide acrylicacid copolymer (PAMAA) and the modified surface of nano-SiO2 is investigated using the molecular dynamic (MD) simulation. The binding energies (Ebinding) of interface, the concentration profiles of PAMAA and functional groups (carboxyl and acylamino) of corresponding model, the mean square displacements (MSD) and diffusion coefficients (D) of PAMAA in four systems with different modifiers are all calculated at 325 K in vacuum. Vinyl trimethoxy silane (VTEOS) shows best modification effect in the systems mentioned above. Furthermore, the effects of temperature on the interaction between VTEOS modified surface of nano-SiO2 and PAMAA are studied at 300, 325, 350, 375 and 400 K in aqueous solution. Interesting results show that, water molecular layer reduces with the increase of temperature, and then improves the interaction between PAMAA and VTEOS modified surface of nano-SiO2. The corresponding Ebinding of interface, the radial distribution functions (RDF) of carbon atoms on the surface and oxygen atoms of water molecules, the concentration profiles of PAMAA on the surface of nano-SiO2, the MSD and D of PAMAA are all studied seriously to find the reason of this counterintuitive phenomenon. © 2017 Informa UK Limited, trading as Taylor & Francis Group


Wang X.,Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province | Wang X.,Drilling and Production Technology Research Institute | Ou X.,Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province | Ou X.,Drilling and Production Technology Research Institute | And 2 more authors.
Drilling Fluid and Completion Fluid | Year: 2017

Waste oil base muds (OBMs) are disposed of presently by burial or reinjection. Potential pollution to environment and waste of large amount of mineral oil are the problems inusing these disposal methods. A study has been conducted on the recycling of waste OBMs from the Platform 202H3. The waste mud had apparent viscosity of 100-120 mPa·s, plastic viscosity (PV) of 80-100 mPa·s, yield point (YP) of 20 Pa, and 10″/10′ gel strengths of 20/35 Pa/Pa The particle sizes of the mud lied between 5.59 μm and 13.74 μm. Studies showed that injection of 2 m3 waste oil base mud back into the well We202H3-3, which penetrated the Longmaxi formation, the final gel strength of the oil base mud in use was increased and the YP/PV ratio became uncontrollable. Use the low quality solids from the waste OBMs, a lost control slurry (LCM muds) was prepared and successfully used in controlling mud losses occurred in the well Changning-H12-3. From these practices, it was concluded that the troubles in recycling waste OBMs lied in the large amount of particles with sizes less than 20 μm, which were difficult to remove with the solids control equipment currently available. Technologies currently available in disposing of waste OBMs will be faced with problems such as safety, large spaces required, energy consumption, transportation, environment protection, and cost. It is thus suggested that the waste OBMs be used in formulating LCM muds, which can be used in controlling mud losses in shale gas drilling, thereby reducing economic losses to some extent. It is also suggested that if supercritical CO2 fluid extraction technology can be used in cost control, it will be an important technology in waste OBMs disposal. © 2017, The Editorial Board of Drilling Fluid & Completion Fluid. All right reserved.


Dai S.,Southwest Petroleum University | Dai S.,Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province | Liu Y.,Southwest Petroleum University | Huang Z.,Southwest Petroleum University | Zhao X.,University of Sichuan
Composite Interfaces | Year: 2017

In this study, nanosilica/crosslinked Polyacrylamide (PAM) microsphere with a core–shell structure is designed to make a functional material, where nanosilica provides the rigidity, stiffness and strength, the crosslinked PAM provides the flexibility and elasticity. The structure mentioned above make the resulting microspheres to be able to enter, expand, shut off and be removed from deep layers of oilfields. A methodology to create the nanosilica/crosslinked PAM microsphere with a core–shell structure has been developed, and molecular dynamic (MD) simulations are applied to successfully study the interaction between the microsphere and water in aqueous solution of nanosilica/crosslinked PAM microsphere and its swelling behavior. Results including the interaction energies (Einter) between nanosilica and crosslinked PAM, Einter between the microsphere and water molecules, radius of gyrations (Rg) of the microsphere, the radial distribution functions of microsphere-water pairs, the mean square displacements and the diffusion coefficients (D) of water are calculated and analyzed in detail. The experimental results of particle diameter tested from dynamic light scattering have been used to verify the simulation results of swelling behavior. © 2017 Informa UK Limited, trading as Taylor & Francis Group


Jing M.,Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province | Jing M.,Drilling and Production Technology Research Institute | Tao H.,Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province | Tao H.,Drilling and Production Technology Research Institute | And 2 more authors.
Drilling Fluid and Completion Fluid | Year: 2017

A hydrophilically inhibitive water base drilling fluid has been developed to drill shale gas wells penetrating the Longmaxi Formation. This drilling fluid was formulated with a hydrophilically inhibitive agent CQ-SIA and a high performance lubricant CQLSA. CQ-SIA, the core additive of the formulation, is amphoteric in nature, and can render wettability reversal to the surface of rocks. It forms on the surface of rocks a hydrophilic film, thereby encapsulating and inhibiting the rocks from disintegration by water invasion. Hot rolling test results showed that 1% CQ-SIA gave percent cuttings recovery of 83.72%, remarkably higher than that obtained with KPAM, AP-1 and KCl. CQ-LSA, thanks for its special molecular groups and structure, can form lipophilic film on the hydrophilic surfaces of drilling tools, mud cakes and formation rocks, thereby greatly decreasing frictional resistance experienced in drilling. Sticking coefficient of a 5% bentonite slurry treated with 1% CQ-LSA was 0.0507, lower than the 5% bentonite slurries treated with two commonly used lubricants RH-220 and BARALUBE. The formulated drilling fluid had good rheology, high inhibitive capacity and good lubricity that were equivalent to oil base drilling fluid. Addition of 1%-3% anti-sloughing plugging agent, 1%-2% poly glycol and 0.8%-1.6% nano plugging agent rendered the formulation good plugging performance. It also had good contamination resistance. Success has been gained in the first use of this formulated drilling fluid on the well Changning H25-8. Mud properties in the horizontal fourth interval (3, 079 m open hole length and 1, 500 m horizontal section) were all maintained stable. No downhole problems have ever occurred. Tripping, wireline logging, casing running and well cementing were all done smoothly. © 2017, The Editorial Board of Drilling Fluid & Completion Fluid. All right reserved.


Jing X.,Southwest Petroleum University | Lu H.,Southwest Petroleum University | Lu H.,Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province | Wang B.,Southwest Petroleum University | And 3 more authors.
Journal of Applied Polymer Science | Year: 2017

A triblock copolymer, containing a polyethylene glycol (PEG) block and two symmetrical poly(2-(dimethylamino)ethyl methacrylate) (PDM) blocks, was synthesized by using PEG-based macroinitiator with copper-mediated living radical polymerization. The conductivity tests showed that the copolymer exhibited switchable responsiveness to CO2, i.e., a relatively high conductivity of solution can be switched on and off by bubbling and removing of CO2. According to the nuclear magnetic resonance results, the CO2-switchable conductivity variation could be attributed to protonation and deprotonation of tertiary amine groups in PDM blocks. Moreover, at a proper weight concentration 0.5%, the copolymer aqueous solution displayed a CO2-switchable viscosity variation. Scanning electron microscopy, cryogenic transmission electron microscopy, and dynamic light scattering characterization jointly demonstrated that the viscosity variation was the result of a CO2-switchable vesicle-network aggregate structure transition. This structure transition can actually be attributed to a hairpin-line molecular configuration conversion in terms of the reasonable mechanism discussion. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44417. © 2016 Wiley Periodicals, Inc.


Dai S.,Southwest Petroleum University | Dai S.,Oil & gas Field Applied Chemistry Key Laboratory of Sichuan Province | Chen Z.,Southwest Petroleum University | Huang Z.,Southwest Petroleum University
Russian Journal of Applied Chemistry | Year: 2017

Polyacrylamide (PAM)-silica microspheres with core-shell structure are synthesized by inverse microemulsion polymerization in this study for the application of water shut-off due to high strength of nanosilica, crosslinked shell of PAM and strong interaction between PAM and silica. The core-shell microspheres flow into the high permeable layers along with injected water, meanwhile, swell after absorbing water and migrate into the deeper layer under the pressure by deformation, which efficiently increase the pressure of low and medium permeable layers, and decrease the loss of water into high permeable layers. Most resources of crude oil locate in low and medium permeable layers, and this work plays a very important role in the enhancement of recovery ratio of crude oil by new material. Transmission electron microscope (TEM), digital microscopes, dynamic light scattering (DLS), and thermogravimetric analysis (TGA) are used to study the shape, size and high temperature resistant of the microsphere. Moreover, capillary flow experiments, nuclear-pore film filtration, and sand packed tube displacement experiment are applied to analysis the mechanisms of deep profile control. © 2017, Pleiades Publishing, Ltd.


Zhang C.,Southwest Petroleum University | He Y.,Southwest Petroleum University | He Y.,Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province | Li F.,Southwest Petroleum University | And 3 more authors.
Journal of Alloys and Compounds | Year: 2016

A novel hybrid materials Fe3O4 nanoparticles supported by hexagonal boron nitride (h-BN) is successfully prepared via mussel-inspired chemistry of dopamine by hydrothermal synthesis method. The surface modification and microstructure of h-BN-Fe3O4 are characterized by FT-IR, XRD, XPS, SEM and TEM. The nano-Fe3O4 obtain well dispersion supported by h-BN layer platform, and the h-BN-Fe3O4 hybrid materials exhibit a remarkable superiority in enhancing the anticorrosion performance of epoxy coatings. The lamellar structural h-BN and nano-Fe3O4 provide a significant synergistic effect in anticorrosion performance for epoxy composite coatings. In addition, the anticorrosion mechanisms of h-BN-Fe3O4 are tentatively discussed. © 2016 Elsevier B.V.


Zhang Y.,Southwest Petroleum University | Fang S.,Southwest Petroleum University | Fang S.,Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province | Tao T.,Southwest Petroleum University | And 4 more authors.
Journal of Dispersion Science and Technology | Year: 2016

Oil-in-water emulsion is an innovate manner by which heavy crude oil can be transported from producing sites to transforming sites through pipelines. The effect of emulsifier on the interfacial properties and demulsification performance of demulsifier for heavy crude oil–in-water emulsion has been studied by many researchers. However, the influence of asphaltene in heavy crude oil on the interfacial properties of demulsifier has not been investigated yet. In this article, the influence of asphaltene concentration of two typical demulsifiers (straight-chained SP-1 and branch-chained AE-1) was systematically studied in terms of absorption thermodynamics, absorption kinetics, and coalescence kinetics. The results revealed that the demulsifier adsorption was a ΔS controlled spontaneous process. The absolute value of ΔG of SP-1 adsorption was found to decrease with asphaltene concentration, whilst the asphaltene concentration had no significant influence on that of AE-1. With the increase of asphaltene concentration, the demulsifiers’ adsorption rates increased, but the reorganization rates on the interface decreased. Coalescence speed of asphaltene droplet decreased with asphaltene concentration in spite of demulsifier type. Additionally, AE-1 had higher absolute value of ΔG, adsorption speed, and coalescence speed than that of SP-1 at the same condition. © 2016, Copyright © Taylor & Francis Group, LLC.


Li K.,Southwest Petroleum University | Duan M.,Southwest Petroleum University | Duan M.,Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province | Wang H.,Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province | And 3 more authors.
Colloid and Polymer Science | Year: 2015

Demulsifier is widely used in the petroleum industry to remove water from crude oil all over the word. It is believed that demulsifier reduces the stability of the oil-water interface by adsorbing on asphaltene. However, the adsorption kinetic is still unrevealed. Herein, the investigation was carried out to measure the adsorption behavior of triblock copolymer demulsifier poly (propylene oxide)-poly (ethylene oxide)-poly (propylene oxide) (PPO-PEO-PPO, which also named as SP-169 in petroleum industry) on asphaltene. In this paper, the adsorption behaviors of SP-169 on the asphaltene were investigated by dual polarization interferometry (DPI). DPI is a real-time and label-free analytical technique used to measure the structure changes of molecular layers in the solid/liquid interface. First, asphaltene was immobilized onto the silicon oxynitride chip surface by spin coating. Then, different concentrations of SP-169 solution were, respectively, injected onto the immobilized chips. Finally, the real-time mass, thickness, density changes during the adsorption process were accordingly recorded and calculated. The overall results show that the adsorption behavior of SP-169 on asphaltene obeys a two-step process. Concentration and the rearrangement of adsorbed molecule are both contribution to the adsorption of SP-169. Furthermore, the release of monomer from micelle above 300 mg/L results in special adsorption behavior. © 2015 Springer-Verlag Berlin Heidelberg


Yu Z.,Southwest Petroleum University | Yu Z.,Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province | Li F.,Southwest Petroleum University | Li F.,Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province | And 10 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2016

CuSO4·5H2O and Na2S2O3 were used as the copper and sulfur sources which were mixed with the graphene oxide (GO) solution to synthesize rGO–CuS/Cu2S heteronanostructures by a facile one-pot method. Scanning electron microscopy, transmission electron microscope, and X-ray photoelectron spectroscopy observations show the morphology and elemental distribution of the composites, confirming that CuS/Cu2S heteronanostructures are decorated on the GO sheets. The experimental results of photocatalytic degradation also show that the novel composites exhibit remarkable visible-light photocatalytic activities for methylthionine blue dye degradation whose degradation rate is 96 %. The high visible photocatalytic performances are attributed to photoinduced interfacial charge transfer in the heteronanostructures and their further transfer by rGO sheets. This new composition is expected to show considerable potential applications in water purification. © 2016 Springer Science+Business Media New York

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