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Hao H.-R.,Yulin University | Xue C.-H.,Yulin University | Chen G.,Xian Shiyou University | Zhao J.-R.,Shaanxi Yanchang Petroleum Oilfield Chemical Technology Co. | Hong L.,Jiangsu Santacc Co.
Open Petroleum Engineering Journal | Year: 2015

Methylglucoside (MEG) has been used in the water-based mud with fine montmorillonite (MMT) swelling inhibition, but it still has such shortages as large concentration and low thermostability. In this work, carboxymethyl glucoside (CMG) was synthesized with glucose and sodium chloroacetate and used as swelling inhibitor. The inhibition of CMG against clay swelling was investigated by MMT linear expansion test, mud ball immersing test and bentonite inhibition test. The results showed that the CMG has a good inhibition to the hydration swelling and dispersion of MMT. Under lower concentrations, the linear expansion rate of MMT in CMG solution is much lower than that of MEG, and the hydration expansion degree of the mud ball in the CMG solution was significantly inhibited. The characterizations of physicalchemical properties of particle, analysized by thermogravimetric analysis and scanning electron microscopy revealed that CMG plays a great role in preventing water from absorbing and keeps MMT in large particle size. © Hao et al.; Licensee Bentham Open. Source


Hao H.-R.,Yulin University | Su H.-J.,Yulin University | Chen G.,Xian Shiyou University | Zhao J.-R.,Shaanxi Yanchang Petroleum Oilfield Chemical Technology Co. | Hong L.,Jiangsu Santacc Co.
Open Fuels and Energy Science Journal | Year: 2015

To seek for new catalysts for the aquathermolysis of crude oil under relatively low temperature, in this paper, a series of Mannich base-transit metal coordination complexes was synthesized and used in aquathermolysis of heavy oil as catalyst. The results show an evident viscosity reduction by 84.2% for the heavy oil reacted at 180 oC for 24 h catalyzed by the Ni(II) coordination complex. The group compositions, the element content of the heavy oil and paraffin crystal morphology before and after the aquathermolysis reaction were analyzed, which are consistent with the viscosity reduction of the heavy oil. Besides the catalysts were also found to be widely applicable. © Hao et al.; Licensee Bentham Open. Source


Zhang J.,Xian Shiyou University | Zhang Q.,Xian Shiyou University | Chen G.,Xian Shiyou University | Zhao J.-R.,Shaanxi Yanchang Petroleum Oilfield Chemical Technology Co. | Tang D.-Y.,Shaanxi Yanchang Petroleum Oilfield Chemical Technology Co.
Applied Mechanics and Materials | Year: 2014

The pomegranate husk extract is modified by formaldehyde and diethylamine, the products have been investigated as corrosion inhibitors for Q235A steel used in oil fields. The inhibition efficiency of products have been measured by weight loss method with the concentration range from 10 mg/L to 1,000 mg/L in 1wt% HCl at different temperture. The inhibition efficiency of the modification product shows good inhibition efficiency after modified by formaldehyde and diethylamine, which is up to 89.31% at 60°C. The inhibitory effect of modification products is in accord with Langmuir adsorption equation. © (2014) Trans Tech Publications, Switzerland. Source


Zhang J.,Xian Shiyou University | Cai D.,Xian Shiyou University | Chen G.,Xian Shiyou University | Tang D.,Shaanxi Yanchang Petroleum Oilfield Chemical Technology Co. | Zhao J.,Shaanxi Yanchang Petroleum Oilfield Chemical Technology Co.
Natural Gas Industry | Year: 2014

Borehole instability caused by mudstone hydrous disintegration has always been a technical difficulty in drilling operation, so it is necessary to improve the inhibitive capability of water-based drilling fluid used in shale formation drilling to minimize the incidence of downhole problems. For this purpose, dicarboxylic acids and amines were used as raw materials to synthesize the polyamine shale inhibitor, of which the inhibitive capability was evaluated through clay-swelling test, anti-expansion test, mud-making inhibition experiment, drilling fluid property evaluation, and other experiments. The evaluation results indicate that the product from oxalic acid, succinic acid, adipic acid and tetraethylenepentamine with a mole ratio of acid and amine at 1:2 shows the best inhibitive capability, and the inhibitive capability of the solution with a concentration of 0.1% is equal to the potassium chloride solution with a concentration of 4.0%; the dynamic shear value will be significantly reduced after selected inhibition is added into the drilling fluid and the value change will be more obvious if the soil volume is larger. The linear bentonite swelling ratio in 0.1% dicarboxylic acid-tetraethylenepentamine solution within 90 min is similar to that in the 4.0% potassium chloride solution under the same conditions, and the anti-swelling rate also reaches up to 34.41%. The polyamine inhibitor enhances the viscosity of water-based drilling fluid with low dosage and shows a strong inhibitive capability to bentonite hydration swelling and dispersion at room temperature. Source


Jie Z.,Xian Shiyou University | Lili L.,Xian Shiyou University | Gang C.,Xian Shiyou University | Ying T.,Xian Shiyou University | And 2 more authors.
Journal of the Chemical Society of Pakistan | Year: 2015

Melamine and sodium chloroacetate were used as raw materials to synthesize a kind of quaternary ammonium salt (QAS) as potential clay swelling inhibitor and water-based drilling fluid additive, and the reaction conditions were screened based on the linear expansion rate of bentonite. The inhibitive properties of QASs were investigated by various methods, including montmorillonite (MMT) linear expansion test, mud ball immersing test, particle distribution measurement, thermogravimetric analysis and scanning electron microscopy etc. The results indicate that QAS can inhibit expansion and dispersion of clay in water effectively. At the same condition, the bentonite linear expansion rate in QAS-2 solution is much lower than those of others, and the hydration expansion degree of the mud ball in 0.5% QAS-2 solution is appreciably weaker than the control test. The compatibility test indicates QAS-2 could be compatible with the conventional additives in water-based drilling fluids, and the temperature resistance of modified starch was improved effectively. Meanwhile, the inhibitive mechanism was discussed through the particle distribution measurement, thermogravimetric analysis and scanning electron microscopy. Source

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