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Zhang J.,State Key Laboratory of Offshore Oil Exploitation | Zhang J.,China National Offshore Oil Corporation
Advanced Materials Research | Year: 2013

A novel kind of activated polymer flooding (APF) composing activated agent and polymer components designed for the target reservoir is studied for the first time. Interactions between the activated agent and natural surfactant from heavy oil, and the synergistic effect between the activated agent and polymer are existed. APF could enhance more oil recovery with less investment, compare to polymer-surfactant flooding (PSF) in the offshore heavy oilfield. The optimum formulation of APF is 1200mg/L polymer + 500mg/L activated agent. Experimental results implies that (1) the contained amide groups and sulfonic groups in APF can form hydrogen bonds with -NH2 groups contained in PM, (2) the apparent viscosity of APF was higher than PM along with the increase of shear rate, (3) the viscoelasticity, deformation capability and solubility of APF were much better than PM. © (2013) Trans Tech Publicutions, Switzerland. Source


Liu L.,State Key Laboratory of Offshore Oil Exploitation | Zhang J.,China National Offshore Oil Corporation
Xinan Shiyou Daxue Xuebao/Journal of Southwest Petroleum University | Year: 2012

The effect of equipment of rapid dissolution of polymer on the dissolution time of the hydrophobic association water-soluble polymer (AP-P4) is studied. Experimental results indicate that stretching device would shorten the dissolution time of the hydrophobic association water-soluble polymer (AP-P4). Moreover, the best spacing of the stretching device is 200 μm, at which the shortest dissolution time of the hydrophobic association water-soluble polymer (AP-P4) is 25 mins. The hydrophobic association water-soluble polymer (AP-P4) after treatment with equipment of rapid dissolution of polymer would dissolve in 30 mins. And the dissolution time of the hydrophobic association water-soluble polymer (AP-P4)decrease with water temperature increasing. Source


Zhao H.,Yangtze University | Kang Z.,Sinopec | Sun H.,Yangtze University | Zhang X.,State Key Laboratory of Offshore Oil Exploitation | Li Y.,Yangtze University
Petroleum Exploration and Development | Year: 2016

In view of the limitations that the current connectivity model can only forecast the fluid production dynamic change, can't calculate the dynamics of oil and water phases, and can't analyze the connectivity between wells layer by layer, this study establishes a new interwell connectivity model for multilayer reservoirs which can simulate dynamics of oil and water between wells. The model hierarchically separates the reservoir system into a series of interwell connecting units characterized by parameters such as conductivity and control volume, and by using the material balance equation, the pressure and interwell flow at constant liquid production or constant pressure mode is calculated regarding the connecting unit as a simulation object, which are combined with the frontal advance theory to establish interwell saturation tracking calculation, and finally water production dynamics of every layer at well points can be worked out. On this basis, using simultaneous perturbation stochastic approximation method and gradient projection method, a model parameter inversion method is set up by dynamic fitting. The application cases show that the model has good dynamic fitting and prediction effect, inversed model parameters coincide with the actual geological parameters, verifing the validity of the method. Compared with the current connectivity method, it can obtain the real-time model of hierarchical interwell flow rate distribution coefficient, liquid production of single well and oil split coefficient and other information, and reflect the reservoir horizontal and vertical oil-water flow relation more accurately, providing guidance for production measure adjustment in oilfield. © 2016 Research Institute of Petroleum Exploration & Development, PetroChina. Source


Li R.,State Key Laboratory of Offshore Oil Exploitation | Li R.,China National Offshore Oil Corporation
Applied Mechanics and Materials | Year: 2013

The solvent flotation technique adopts organic solvent with low volatility as the second liquid phase, which could dissolve the components including emulsified crude oil, surfactant in the water. The modification of pH value, ion intensity, temperature, speed of air flow, and species of solvent could improve the efficiency of the flotation. The proposed method has been successfully applied to produced water treatment, the pharmaceutical industry sewage disposal and so on. It also has potential usage in sewage disposal of offshore oil field. © (2013) Trans Tech Publications, Switzerland. Source


Hu J.,South China University of Technology | Li S.,South China University of Technology | Wang Y.,South China University of Technology | Lang X.,South China University of Technology | And 2 more authors.
Journal of Natural Gas Chemistry | Year: 2012

In oil and gas field, the application of kinetic hydrate inhibitors (KHIs) independently has remained problematic in high subcooling and high water-cut situation. One feasible method to resolve this problem is the combined use of KHIs and some synergists, which would enhance KHIs' inhibitory effect on both hydrate nucleation and hydrate crystal growth. In this study, a novel kind of KHI copolymer poly(N-vinyl-2-pyrrolidone-co-2-vinyl pyridine)s (HGs) is used in conjunction with TBAB to show its high performance on hydrate inhibition. The performance of HGs with different monomer ratios in structure II tetrahydrofuran (THF) hydrate is investigated using kinetic hydrate inhibitor evaluation apparatus by step-cooling method and isothermal cooling method. With the combined gas hydrate inhibitor at the concentration of 1.0 wt, the induction time of 19 wt THF solution could be prolonged to 8.5 h at a high subcooling of 6°C. Finally, the mechanism of HGs inhibiting the formation of gas hydrate is proposed. © 2012 CAS/DICP. Source

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