The developed effect of field test with high concentration polymer flooding in Daqing oilfield

The field test of high-concentration displacement is implemented in Lamadian Oilfield North West Block. The value of enhanced oil recovery in the central area is up to 20 percent or more. In order to explore the reason of good stimulation effect of high concentration polymer flooding in Lamadian Oilfield, the mechanism of high concentration polymer systems for EOR is conducted in this paper. The high concentration is characterized by the viscosity and elasticity of polymer in this article. The results showed that: the concentration of polymer with 25 million molecular weight reach to 3000mg/L, the increases value of viscoelasticity is the largest. So high-concentration polymer is defined as 3000mg/L. Compared with conventional polymer flooding, high concentration polymer has a greater ability to expand swept volume and effectiveness of wash oil.

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Response surface methodology approach for the optimisation of adsorption of hydrolysed polyacrylamide from polymer-flooding wastewater onto steel slag: a good option of waste mitigation

Water Science & Technology ◽

10.2166/wst.2017.245 ◽

2017 ◽

Vol 76 (4) ◽

pp. 776-784 ◽

Cited By ~ 2

Author(s):

Mijia Zhu ◽

Jun Yao ◽

Zhonghai Qin ◽

Luning Lian ◽

Chi Zhang

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Removal Efficiency ◽

Contact Time ◽

Interactive Effect ◽

Steel Slag ◽

Oxygen Demand ◽

Polymer Flooding ◽

High Concentration ◽

Adsorbent Dosage

Wastewater produced from polymer flooding in oil production features high viscosity and chemical oxygen demand because of the residue of high-concentration polymer hydrolysed polyacrylamide (HPAM). In this study, steel slag, a waste from steel manufacturing, was studied as a low-cost adsorbent for HPAM in wastewater. Optimisation of HPAM adsorption by steel slag was performed with a central composite design under response surface methodology (RSM). Results showed that the maximum removal efficiency of 89.31% was obtained at an adsorbent dosage of 105.2 g/L, contact time of 95.4 min and pH of 5.6. These data were strongly correlated with the experimental values of the RSM model. Single and interactive effect analysis showed that HPAM removal efficiency increased with increasing adsorbent dosage and contact time. Efficiency increased when pH was increased from 2.6 to 5.6 and subsequently decreased from 5.6 to 9.3. It was observed that removal efficiency significantly increased (from 0% to 86.1%) at the initial stage (from 0 min to 60 min) and increased gradually after 60 min with an adsorbent dosage of 105.2 g/L, pH of 5.6. The adsorption kinetics was well correlated with the pseudo-second-order equation. Removal of HPAM from the studied water samples indicated that steel slag can be utilised for the pre-treatment of polymer-flooding wastewater.

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Pressure Transient Behavior for Alternating Polymer Flooding in a Three-zone Composite Reservoir

Polymers and Polymer Composites ◽

10.1177/096739111702500101 ◽

2017 ◽

Vol 25 (1) ◽

pp. 1-10 ◽

Cited By ~ 1

Author(s):

Changyu Zhu ◽

Shiqing Cheng ◽

Youwei He ◽

Engao Tang ◽

Xiaodong Kang ◽

...

Keyword(s):

History Matching ◽

Petroleum Industry ◽

Composite Model ◽

Polymer Flooding ◽

Analysis Model ◽

High Concentration ◽

Pressure Derivative ◽

Type Curves ◽

Formation Evaluation ◽

Pressure Analysis

Alternating polymer flooding has achieved great attractions recently in oil industry, however, the research of pressure analysis in alternating polymer flooding reservoir is rare. This work presents a numerical pressure analysis method of three-zone composite model for formation evaluation. A new numerical pressure analysis model (three-zone composite model) is established by considering diffusion, convection, shear, and inaccessible pore volume, which is based on the rheology experiments. Based on this model, the type curves are then developed and sensitivity analysis is further conducted. The type curves have seven regimes in three-zone composite model. The characteristic is the obvious upturn of pressure derivative curve in transient regime between low concentration and high concentration polymer solution. Formation parameters can be interpreted by history matching and formation evaluation can be conducted based on this model. As an important part of formation evaluation, formation damage as a result of adsorption of polymers in porous media is evaluated by comparing the interpreted permeability with the original value before polymer flooding. The field test data proves that this proposed method can accurately evaluate reservoir characteristics in alternating polymer flooding reservoirs, which emphasizes the potential application of this method in petroleum industry.

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Visco-Elastic Property Studies on Polymer Flooding Systems with High Concentrations

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.550-553.834 ◽

2012 ◽

Vol 550-553 ◽

pp. 834-837

Author(s):

Ji Gang Wang ◽

Quan Qing Du ◽

Peng Wu ◽

Shao Li Hu ◽

Pan Niu

Keyword(s):

Elastic Property ◽

Oil Recovery ◽

Elastic Characteristic ◽

Polymer Flooding ◽

Oil Field ◽

High Concentration ◽

Improved Oil Recovery ◽

High Molecular Weight Polymer ◽

Molecular Weight Polymer ◽

Asp Flooding

Keywords: Visco-elastic property; polymer flooding; oil recovery Abstract. Polymer flooding and ASP flooding has improved oil recovery a lot in Daqing oil field. In ASP flooding, the existence of alkali decreases the visco-elastic characteristic of polymer, which decreases the oil recovery of polymer flooding. The aim of this paper was to study the visco-elastic characteristic, shear resistance in high concentration and high molecular weight polymer flooding, and analyzed the suitable parameter of it .They can provide the theory of polymer flooding development and application research.

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A Computer Simulation Study of High Concentration Polymer Flooding

2010 International Conference of Information Science and Management Engineering ◽

10.1109/isme.2010.89 ◽

2010 ◽

Author(s):

Daiyin Yin ◽

Weiming Huang ◽

Xueqing Xu

Keyword(s):

Computer Simulation ◽

Simulation Study ◽

Polymer Flooding ◽

High Concentration ◽

Computer Simulation Study

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The Effect of Well Site and interlayer permeability on Recovery Factor of Horizontal Well-High Concentration Polymer Flooding in Lateral Accretion Layer

Proceedings of the International Conference on Advances in Energy, Environment and Chemical Engineering ◽

10.2991/aeece-15.2015.55 ◽

2015 ◽

Author(s):

Taoping Chen ◽

Qiang Li

Keyword(s):

Horizontal Well ◽

Polymer Flooding ◽

Recovery Factor ◽

High Concentration

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Study on Formulation with Lower Initial Viscosity Gel/Alkali/Surfactant/Polymer After Polymer Flooding and Scenario Design of Field Test

10.2118/205164-ms ◽

2021 ◽

Author(s):

Cheng Jie Cheng ◽

Bo Hai Liu ◽

Qian Gao ◽

Wei Yan ◽

Lin Wen Chen ◽

...

Keyword(s):

Field Test ◽

Oil Recovery ◽

Laboratory Experiments ◽

Polymer System ◽

Polymer Flooding ◽

High Permeability ◽

Injection Parameters ◽

Scenario Design ◽

Enhance Oil Recovery ◽

Initial Viscosity

Abstract The blocks of polymer flooding have gradually entered into the stage of chase water flooding after polymer flooding in Daqing Oilfield and the comprehensive water cut is close to the exploitation limit of 98%. So it is urgent to develop some new technologies to further enhance oil recovery after polymer flooding. On the basis of laboratory research, a field test of alkali/surfactant/polymer flooding was carried out after polymer flooding in Daqing Oilfield in 2015, which achieved good development effect, but the polymer concentration was relatively large. Based on the field test of alkali/surfactant/polymer flooding, a new technology of the lower initial viscosity gel/alkali/surfactant/polymer flooding has further been studied according to the technical route combining plugging, adjusting and displacing, which can reduce the polymer dosage greatly under the premise of ensuring good oil displacing effect. In this paper, some laboratory studies are carried out, which realize significant technology breakthrough. Firstly, the adjusting and plugging agent of lower initial viscosity gel is screened out, which can be injected into the high permeability layers of low flow resistance like the water and migrate to the deep location of the high permeability layers and then gelatinize on spot. Therefore it can plug high permeability layers effectively and does not pollute the middle and low permeability layers at the same time. Secondly, the injection parameters of lower initial viscosity gel/alkali/surfactant/polymer system are optimized. The results of laboratory experiments show that the lower initial viscosity gel/alkali/surfactant/polymer system can enhance oil recovery by 13.5% OOIP under the optimal injection parameters, which is 1.2% OOIP more than that of the alkali/surfactant/polymer flooding and can save polymer dosage by 17.8%. In view of the good results obtained in laboratory experiments, the scenario design of field test is carried out and the incremental oil recovery is 10.1% OOIP predicted by numerical simulation. The field test is expected to start chemical flooding in 2021.

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