Research on deep profile control technology of polymer gel with low hydrolytic degree

2019 ◽  
Vol 9 (9) ◽  
pp. 1087-1091 ◽  
Author(s):  
Dong Zhang ◽  
Jianguang Wei ◽  
Runnan Zhou ◽  
Haiqiao Xu
Keyword(s):  
Oil Recovery ◽  
Polymer Concentration ◽  
Gelation Time ◽  
Polymer Gels ◽  
Degree Of Hydrolysis ◽  
Crosslinking Reaction ◽  
Polymer Gel ◽  
Profile Control ◽  
Deep Profile ◽  
Enhance Oil Recovery

Polymer gels have attracted increasing interest as profile control agent to control water content and enhance oil recovery in heterogeneous reservoirs. However, retarding the gel crosslinking reaction of polymer and making it farther in the reservoir has become a difficulty in deep profile control. In this article, polyacrylamide with low degree of hydrolysis was prepared to react slowly with chromium ion to form gel, which was used for adjusting water injection profile. The microstructure of polymer gel was characterized using Fourier transform infrared spectroscopy and scanning electron microscopy. Core displacement experiments were used to evaluate the profile adjustment capability of polymer gels. It was found that the gel prepared by crosslinking the 5% polyacrylamide with chromium acetate can retard gelation time to 30 days in comparison with the conventional polymer gels when the polymer concentration reached to 1500 mg/L. The gel can form a regular spatial network which increases the viscosity from 80.2 to 6578 mPa · s. The results obtained by the core flooding experiment prove that the polymer gel has good profile control ability and further demonstrate the future potential of polymer gel to enhance oil recovery.

scholarly journals Study on the variation of rock pore structure after polymer gel flooding

e-Polymers ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 32-38
Author(s):  
Dong Zhang ◽  
Jianguang Wei ◽  
Xinren Fang
Keyword(s):  
Pore Structure ◽  
Oil Recovery ◽  
Control Mechanism ◽  
Polymer Gels ◽  
Polymer Gel ◽  
Reservoir Water ◽  
The Core ◽  
Profile Control ◽  
Enhance Oil Recovery ◽  
Micro Structures

AbstractPolymer gels have received an increasing attention as profile control agents in the heterogeneous reservoir water-flooded layers. The article focus on the profile control mechanism of polymer gels by plugging macropore. The micro-structures of polymer gel and pore were characterized by scanning electron microscopy (SEM). And the core displacement equipment was used to evaluate the properties of plugging properties. The variation of pore structure is measured by SEM, mercury intrusion meter and nuclear magnetic resonance instrument. Investigation results show that the molecules form a network structure with many dense layers after 15 days of cross-linking reaction, which results in the increase of the viscosity of the system from 15.3 to 6325 mPa‧s. After the polymer gel forms a micelle at the middle end of the core and blocks the pores, the plugging rate of the core reaches 99.2%. The results obtained in this paper reveal the mechanism of plugging characteristics of polymer gels, and further prove the great potential of polymer gels to enhance oil recovery in oilfields.

Study on Influence of Injection Method on the Effect of Oil Displacement of Nanometer Microspheres

2013 ◽  
Vol 734-737 ◽  
pp. 1272-1275
Author(s):  
Ji Hong Zhang ◽  
Zhi Ming Zhang ◽  
Xi Ling Chen ◽  
Qing Bin He ◽  
Jin Feng Li
Keyword(s):  
Oil Recovery ◽  
Experimental Result ◽  
Displacement Efficiency ◽  
Oil Displacement ◽  
Profile Control ◽  
Oil Displacement Efficiency ◽  
Injection Methods ◽  
The One ◽  
Deep Profile ◽  
Enhance Oil Recovery

Nanometer microspheres injection is a new deep profile control technology. Nanometer microspheres could inflate with water, resulting in plugging step by step in reservoirs, which could improve the swept efficiency in the reservoir and enhance oil recovery. By using non-homogeneous rectangular core, oil displacement efficiency experiment was conducted for studying the influence of different injection methods on the effect of injection nanometer microspheres. The experimental result shows that, compared with development effect of single-slug injection or triple-slug injection, the one of double-slug injection is better. Nanometer microspheres can enhance oil recovery significantly in medium and low permeability reservoir.

Preparation and Performance Evaluation of Alkali-resistant Gel-type Deep Profile Agent

2016 ◽  
Vol 9 (1) ◽  
pp. 21-27 ◽  
Author(s):  
Yazhou Zhou ◽  
Daiyin Yin
Keyword(s):  
Performance Evaluation ◽  
Oil Recovery ◽  
Crosslinking Agent ◽  
Gelation Time ◽  
Alkaline Condition ◽  
Good Effect ◽  
Chemical Agent ◽  
Asp Flooding ◽  
Profile Control ◽  
Deep Profile

Currently, most profile control agents would be degraded in strong alkaline condition. They could not be applied in ASP (alkaline, surfactant and partially hydrolyzed polyacrylamide) flooding. To solve this problem, a new kind of alkali-resistant gel for deep profile has been studied. Based on the profile control mechanism of profile agent and the crosslinking mechanism of the polymer, the selection of the chemical agent with different type and concentration was carried out in strong alkaline (pH=12), using ordinary polymer as the main agent, organic and inorganic chemical crosslinking agent. The performance evaluation, residual resistance factor and displacement experiment for the prepared profile agent were carried out. The results show that the profile agent weakly affected the interfacial tension of the ASP flooding. The gelation time could be tuned by adjusting the concentration of the delayed coagulant. The alkali-resistant profile agent with good plugging performance was suitable for deep profile control. When this profile agent was applied in the process of ASP flooding, it could adjust the liquid producing profile and improve the oil displacement efficiency, the recovery ratio was about 4% higher than ASP flooding. The field test of alkali-resistant gel-type profile agent shows that, this alkali-resistant profile agent can achieve good effect, it can enhance oil recovery by 3%.

Polymer Gelled Technology to Improve Sweep Efficiency in Enhanced Oil Recovery: A Literature Review

2015 ◽  
Vol 1113 ◽  
pp. 690-694 ◽  
Author(s):  
Norfarisha Achim ◽  
Nur Hashimah Alias ◽  
Nurul Aimi Ghazali ◽  
Miradatul Najwa Muhd Rodhi ◽  
Tengku Amran Tengku Mohd ◽  
...  
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Polymer Gels ◽  
Fluid Injection ◽  
Potential Candidate ◽  
Polymer Gel ◽  
Excellent Performance ◽  
Sweep Efficiency ◽  
Enhance Oil Recovery ◽  
Permeability Modification

This article is an overview of the use of polymer gelled technology to improve sweep efficiency in enhanced oil recovery. Recent progress use polymer types, Polyacrylamide and polysaccharide to be applied in enhanced oil recovery (EOR). A lot of researchers concluded that polymer gel stability must be maintained to ensure excellent performance in sweep efficiency. The application of polymer gels in permeability modification to improve volumetric sweep efficiency of fluid injection processes showed fruitful efforts as it can be a potential candidate to enhance oil recovery as compared to other technologies.

scholarly journals Investigation on the effect of active-polymers with different functional groups for EOR

e-Polymers ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 61-68
Author(s):  
Dong Zhang ◽  
Jian Guang Wei ◽  
Run Nan Zhou
Keyword(s):  
Functional Groups ◽  
Oil Recovery ◽  
Molecular Size ◽  
Type I ◽  
Cleaning Efficiency ◽  
Sweep Efficiency ◽  
Profile Control ◽  
Branched Chain ◽  
Swept Volume ◽  
Enhance Oil Recovery

AbstractActive-polymer attracted increasing interest as an enhancing oil recovery technology in oilfield development owing to the characteristics of polymer and surfactant. Different types of active functional groups, which grafted on the polymer branched chain, have different effects on the oil displacement performance of the active-polymers. In this article, the determination of molecular size and viscosity of active-polymers were characterized by Scatterer and Rheometer to detect the expanded swept volume ability. And the Leica microscope was used to evaluate the emulsifying property of the active-polymers, which confirmed the oil sweep efficiency. Results show that the Type I active-polymer have a greater molecular size and stronger viscosity, which is a profile control system for expanding the swept volume. The emulsification performance of Type III active-polymer is more stable, which is suitable for improving the oil cleaning efficiency. The results obtained in this paper reveal the application prospect of the active-polymer to enhance oil recovery in the development of oilfields.

scholarly journals Delayed Crosslinking Amphiphilic Polymer Gel System with Adjustable Gelation Time Based on Competitive Inclusion Method

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 381 ◽  
Author(s):  
Bin Xu ◽  
Huiming Zhang ◽  
He Bian
Keyword(s):  
Gelation Time ◽  
Salt Resistance ◽  
Amphiphilic Polymer ◽  
Polymer Gel ◽  
Polymer Backbone ◽  
Temperature Resistance ◽  
Inclusion Method ◽  
Profile Control ◽  
Resistance Performance ◽  
Gel System

Delayed crosslinking polymer gel systems are widely utilized in deep profile control processes for water production control in oilfields. In this paper, a kind of delayed crosslinking amphiphilic polymer gel system with adjustable gelation time based on competitive inclusion was prepared and its delayed crosslinking gelling properties were studied. The amphiphilic polymer of P(acrylamide (AM)–sodium acrylate (NaA)–N-dodecylacrylamide (DDAM)) was synthesized and it showed much better salt resistance, temperature resistance, and shear resistance performance compared with hydrolyzed polyacrylamide (HPAM). Phenol can be controlled released from the the cavity of β-cyclodextrin (β-CD) ring in the presence of the hydrophobic group used as the competitive inclusion agent in the amphiphilic polymer backbone. Accordingly, the gelation time of the delayed crosslinking amphiphilic polymer gel system is closely related to release rate of the crosslinker from the the cavity of β-CD ring. This study screened an amphiphilic polymer with good salt resistance and temperature resistance performance, which can be used in high temperature and high salinity reservoirs, and provided a feasible way to control the gelation time of the polymer gel system by the competitive inclusion method.

Improvement Research of Organic Phenolic Gel being Used to be an Organic Deep Profile Control Agent

2014 ◽  
Vol 908 ◽  
pp. 46-50
Author(s):  
Yu Li Liu ◽  
Yi Qin
Keyword(s):  
Crosslinking Agent ◽  
Gelation Time ◽  
High Water ◽  
Salt Resistance ◽  
Control Agent ◽  
Water Soluble ◽  
Water Control ◽  
Profile Control ◽  
Weak Gel ◽  
Deep Profile

Organic phenolic gel is commonly used to be a deep profile control agent which applies to use in the high water cut oilfields where heterogeneity is severe, improve the contradiction of inter-reservoir layer and inner layer, expand water sweeping zone, and achieve the purpose of stable oil production and water control. Organic phenolic weak gel is mainly affected by the concentration of each component and reaction temperature. In this paper, formaldehyde was replaced by urotropin, which is not only delaying the gelation time, but also avoiding pollution. In addition, a water-soluble phenolic resin oligomer has been synthesized by the method of two-step alkali catalysis with appropriate mole ratio as an auxiliary crosslinking agent. Considering the concentration of each reactant as the factor, the orthogonal experiments have been designed to optimize the traditional organic HPAM-phenolic weak gel. We have found that the optimized weak gel has a better stability, longer gelation time, better salt resistance and environment friendly. It can better meet the needs of oilfield deep profile control.

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