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%.

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.

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.

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.

scholarly journals The experimental investigation of the HPAM/phenolic resin deep profile system in fractured low-permeability reservoirs

2021 ◽  
Vol 252 ◽  
pp. 02078
Author(s):  
Wei Zhou ◽  
Daiyin Yin ◽  
Yazhou Zhou
Keyword(s):  
Control System ◽  
Control Systems ◽  
Phenolic Resin ◽  
Good Effect ◽  
Low Permeability ◽  
Low Permeability Reservoir ◽  
Shearing Rate ◽  
Profile Control ◽  
Deep Profile ◽  
Low Permeability Reservoirs

The problem of injected water channeling along fractures exists in the process of water injection in fractured low permeability reservoir, aimed at this problem, deep profile control technology applies to plug fractures to improve the recovery of low permeability reservoir. In this paper, partially hydrolyzed polyacrylamide (HPAM) is used as water-plugging/profile-modifying agent and phenolic resin as crosslinker agent. Several profile control systems are tested to find the one which is suitable for fractured low permeability reservoirs. The performances of profile control systems are evaluated, and effects of formation water salinity, that of shearing rate and that of temperature on the performance are studied. Finally, in order to study effects of this profile control system on displacing oil, flowability experiment and core displacement experiment are applied. It shows that with the increase of salinty of prepared water and the increase of the shearing rate, the viscosity of this system decreases. With the increase of temperature, the gelling time shortens, the viscosity increases, but the stability weekens. This kind of profile control system has a good effect on plugging fractures of low permeability cores. After water flooding, this kind of profile control system is injected into cores, the recovery ratio can increase 3.5%. So the profile control system composed of HPAM/ phenolic resin can apply to deep profile control in fractured low permeability reservoir to enhance oil recovery.

Experimental Study on High Temperature-Resistant Gel for Profile Control

2015 ◽  
Vol 733 ◽  
pp. 165-168 ◽  
Author(s):  
Shao Bin Hu ◽  
Peng Wang ◽  
Chang Liang Chen ◽  
Shao Ke Liu ◽  
Zhe Wang
Keyword(s):  
High Temperature ◽  
Oil Recovery ◽  
Volume Fraction ◽  
Crosslinking Agent ◽  
Reservoir Water ◽  
Good Thermal Stability ◽  
Heat Stabilizer ◽  
Profile Control ◽  
Weak Gel ◽  
Gel System

In order to control water and increase oil recovery in reservoir of high temperature (120°C), experiments were carried out to study the impacts of dosage of HPAM, crosslinking agent, delayed crosslinking agent and heat stabilizer on the properties of gel system, and a high temperature-resistant movable weak gel profile control system was presented, whose formula is 2.0g/L HPAM + 0.2% (volume fraction) crosslinking agent + 0.1g/L delayed crosslinking agent + 0.1g/L heat stabilizer. This gel system has good thermal stability at 120°C. It has good flow properties before gelation, and can effectively enter larger pores. After gelation, its viscosity increases so significantly that it can be stranded and the larger pores can be plugged. The plugging rate can be over 93%. Thus, subsequent fluid injection can be redirected into the low-permeability layers, effectively improving the reservoir water absorption profile and oil recovery.

Novel Profile Control Treatment Using Pore-Scale Polymer Elastic Microspheres

2013 ◽  
Vol 716 ◽  
pp. 413-417 ◽  
Author(s):  
Lei Li ◽  
Xue Mei Gao ◽  
Guang Lun Lei ◽  
Xiao Dong Wei
Keyword(s):  
Aqueous Solution ◽  
Oil Recovery ◽  
Water Injection ◽  
Control Agent ◽  
Control Treatment ◽  
Pore Scale ◽  
Swelling Property ◽  
Profile Control ◽  
Heterogeneous Formation ◽  
Deep Profile

In order to solve the deep profile control problem and improve oil recovery of the oilfield, a novel profile control agent pore-scale polymer elastic microspheres (PSPEMs) was synthesized. The swelling property of PSPEMs in aqueous solution was analyzed. Core flow test and double-tube sand pack models were used for studying profile control and flooding performance of PSPEMs in oil formation. The results show that PSPEMs have good swelling property in aqueous solution with high salinity, high temperature and high pressure. Fig 5 and Fig 6 show that PSPEMs are better than polyacrylamide polymer on profile control. Table 1 indicates PSPEMs can improve water injection profile of heterogeneous formation effectively and plug the high permeable layer first. The higher the concentration of PSPEMs, the shorter the time it spends to realize profile control. The results also confirm that use proper concentration of PSPEMs, the profile control efficiency can increase enormously.

The Experimental Research on Combining Binary Compound Flooding and Profile Control Technology to Improve Recovery Efficiency

2014 ◽  
Vol 881-883 ◽  
pp. 1691-1695
Author(s):  
Shao Ning Yuan ◽  
Guang Sheng Cao ◽  
Xiao Wei Duan
Keyword(s):  
Oil Recovery ◽  
Crosslinking Agent ◽  
Oil Production ◽  
Binary Compound ◽  
Compound System ◽  
Production Plant ◽  
Control Technology ◽  
Displacement Effect ◽  
Parallel Displacement ◽  
Profile Control

With the using of binary compound flooding in Jinzhou oil production plant of Liaohe Oilfield, problems like interwell interporosity flow and the unsatisfactory displacement effect occurs. The EOR method of combination of binary compound flooding and profile control technology has been adopted to solve these problems. The JSY crosslinking agent has been selected which has good compatibility with binary compound system by means of experiment of gel strength and gel time. And the formula system of binary compound flooding profile control which can improve the displacement effect of Jinzhou oil production plant has been formed after concentration optimization aim at improving oil recovery. The laboratory core plugging experiments show that the system of binary compound flooding profile control behaves better plugging effect and its plugging rate was greater than 94%. The parallel displacement experiments on low, medium and high permeability cores show that the oil recovery of binary compound flooding profile control system, which can improve the oil recovery more effectively, enhanced about 12% of oil recovery than binary compound flooding.

scholarly journals Dual-Responsive Nanotubes Assembled by Amphiphilic Dendrimers: Controlled Release and Crosslinking

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3479
Author(s):  
Minghui Zhang ◽  
Hui Yang ◽  
Jiazhong Wu ◽  
Siyu Yang ◽  
Danfeng Yu ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Self Assembly ◽  
Crosslinking Agent ◽  
Halloysite Nanotubes ◽  
Release Time ◽  
Layer By Layer ◽  
Stimuli Responsive ◽  
Simple Strategy ◽  
Profile Control ◽  
Amphiphilic Dendrimers

Although stimuli-responsive release systems have attracted great attention in medical applications, there has been no attempt at “precise” deep profile control based on such systems, which is greatly need to improve oil recovery. With this in mind, we provided a facile and simple strategy to prepare stimuli-responsive composite capsules of amphiphilic dendrimers–poly(styrene sulfonic acid) sodium/halloysite nanotubes (HNTs) via layer-by-layer (LbL) self-assembly technique, controlling the release crosslinking agent methenamine under different pH or salinity conditions. The release time of methenamine encapsulated in multilayer shells is about 40 h, which can be prolonged with the introduction of salt or shortened via the addition of acid, which accordingly induces the gelation of polyacrylamide (PAM) solutions, taking from a few hours to a dozen days. This study provided a novel approach for controllable release of chemical agents and controllable crosslinking of deep profiles in many application fields.

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.

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