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 Optimization of development mode of asphalt profile control based on numerical simulation and study of its mechanism

2020 ◽  
Vol 75 ◽  
pp. 30
Author(s):  
Fulin Wang ◽  
Tao Yang ◽  
Yunfei Zhao ◽  
Yanjun Fang ◽  
Fuli Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Oil Recovery ◽  
Evaluation System ◽  
Injection Rate ◽  
Injection System ◽  
Injection Timing ◽  
High Concentration ◽  
Development Mode ◽  
Displacement Effect ◽  
Profile Control

Asphalt profile control is an effective method, which can further improve oil recovery of reservoir polymer flooded, it has a lot of advantages including high strength profile control, seal strata formation efficiency, low cost and no pollution, but there has not a perfect evaluation system for its development mode. The effect of different concentration, injection rate, radius of profile control, the timing of profile and segment combination way on the oil displacement effect of the asphalt profile control were researched using numerical simulation method on actual typical well area in Daqing oilfield, and the mechanism of asphalt profile control was studied in detail. According to the results of laboratory test, the largest Enhanced Oil Recovery (EOR) of asphalt was obtained at injection concentration 4000 mg/L, and the best combination was “high–low–high” concentration slug mode. According to the results of numerical simulation, the best concentration, injection rate, radius of profile control and injection timing were 4000 mg/L, 0.15 PV/a (Pore Volume [PV], m3), 1/2 of well spacing and 96% water cut in single slug of asphalt injection system, when the injection condition was multiple slug, the “high–low–high” slug combination mode was the best injection mode. These results could provide effective development basis for asphalt profile control after polymer flooding in thick oil layers.

Experimental Research on Profile Control Technology Using Sewage Flowed Back from Injecting-Polymer Wells

2012 ◽  
Vol 550-553 ◽  
pp. 2112-2116
Author(s):  
Zhi Feng Cai ◽  
Guang Sheng Cao ◽  
Shao Wei Cheng
Keyword(s):  
Experimental Research ◽  
Oil Recovery ◽  
Economic Benefits ◽  
Gelling Agent ◽  
Cross Linking ◽  
Control Technology ◽  
Use Of Resources ◽  
Profile Control ◽  
Ph Modifier ◽  
Gelling Time

With the amount of injecting-polymer wells in Xingnan SS block of Daqing Oilfield increasing gradually, a lot of problems, such as the treatment and use of sewage flowed back from injecting-polymer wells, need to be solved. The concentrations of gelling agent, cross-linking agent, and regulators have been optimized by measuring gelling strength and gelling time. The additives about pH modifier and deoxidizer have been selected. As a result, the formula system of profile control using sewage flowed back from injecting-polymer wells has been formed, realizing reuse of sewage, reaching the goal of improving oil recovery. The research in this paper not only solves the problem of re-injecting sewage flowed back from injecting-polymer wells, making full use of resources, but saves costs, improving economic benefits.

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.

scholarly journals Nuclear Magnetic Resonance Evaluation Study for Effect of Foam flooding in Heterogeneous Cores

2020 ◽  
Vol 213 ◽  
pp. 01025
Author(s):  
Shuai Hua ◽  
Yuan Li ◽  
Qinfeng Di
Keyword(s):  
Oil Recovery ◽  
Foam Stability ◽  
Dynamic Change ◽  
Water Flooding ◽  
Sweep Efficiency ◽  
Displacement Effect ◽  
Oil Displacement ◽  
Profile Control ◽  
Foam Flooding ◽  
Heterogeneous Cores

Foam flooding demonstrated the ability to solve the viscous fingering problem of gas flooding and increase the sweep efficiency in enhancing oil recovery. It is commonly used in development of heterogeneous reservoirs. While the characteristics of fluid migration in pores and between layers were still unclear. In this paper, Dynamic change of oil and water with different foam quality was tested during foam flooding by NMR method. Oil displacement effect of water flooding and foam flooding was compared. The results showed the foam quality affected the foam stability and profile control effect. Compared with water flooding, the foam could increase the recovery rate of the low-permeability layer, and the foam system with high stability had a high sweep efficiency and a high oil displacement efficiency in the heterogeneous cores.

The Lab Experiment Comparison of Converting into Different Chemical Flooding after Water Flooding in the Stage of Different Water Cut in Untabulated Reservoirs

2012 ◽  
Vol 524-527 ◽  
pp. 1921-1924
Author(s):  
Yan Fu Pi ◽  
Li Liu ◽  
Li Jun Bao ◽  
Kao Ping Song ◽  
Tao Zhang
Keyword(s):  
Molecular Weight ◽  
Oil Recovery ◽  
Mass Concentration ◽  
Binary Compound ◽  
Water Flooding ◽  
Polymeric Surfactant ◽  
Compound System ◽  
Chemical Agent ◽  
Weight Content ◽  
Water Cut

In order to optimize chemical displacing agents for untabulated reservoirs in Daqing oilfield, the natural cores were taken to conduct the physical simulation displacement experimental research with four displacing agents, which included active water with the weight content 0.1%, polymer solution with mass concentration 500mg/L and molecular weight 5 million, polymeric surfactant solution with mass concentration 500mg/L and molecular weight 5 million, binary compound system ( polymer with mass concentration 500mg/L and molecular weight 5 million , surfactant with weight content 0.1%). At different water cut stage of water flooding, the converting displacing agents were injected. The results showed that active water, polymer, polymeric surfactant, binary compound flooding all can enhance oil recovery to some extent; and for the same chemical agent, the earlier of the converting injection time, the higher of the degree of enhancing oil recovery. From displacement efficiencies of four kinds of displacing agents we can conclude that the effect of 0.8 PV polymeric surfactant is the best, following as that of 0.6875 PV binary compound system, that of 0.8 PV polymer and that of 0.5 PV active water. The experimental results of this paper can be used to direct oilfield exploitation practice.

scholarly journals The Reservoir Adaptability and Oil Displacement Mechanism of Polymer Microspheres

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 885 ◽  
Author(s):  
Jianbing Li ◽  
Liwei Niu ◽  
Wenxiang Wu ◽  
Meifeng Sun
Keyword(s):  
Oil Recovery ◽  
Polymer Microspheres ◽  
Polymer Microsphere ◽  
Displacement Effect ◽  
Heterogeneous Reservoirs ◽  
Oil Displacement ◽  
Profile Control ◽  
Reservoir Conditions ◽  
Rational Combination ◽  
Core Permeability

Polymer microsphere profile control is a promising approach for the profile control of heterogeneous reservoirs. Matching between polymer microspheres and the reservoir pore throat is crucial for profile control. In this study, the range of the optimal matching factor Ra between polymer microspheres and core porosity was divided through core permeability limit experiments, and the dynamic migration laws and shut-off patterns of microspheres were studied using 9-m-long cores and microscopic models. The oil displacement effect and mechanism of microspheres were analyzed using three cores in parallel. The “injectability limit” and “in-depth migration limit” curves were divided by Ra into three zones: blockage (Ra < 1.09 ± 0.10), near-well profile control (1.09 ± 0.10 < Ra < 5.70 ± 0.64), and in-depth fluid diversion (Ra > 5.70 ± 0.64). During migration in porous media, the microspheres gradually enlarged in size and thus successively shut off in four forms: multi-microsphere bridging shut-off, few-microsphere bridging shut-off, single-microsphere shut-off, and elastic shut-off. Microspheres with a rational combination of sizes versus those with a single particle size further enhanced reservoir oil recovery under certain reservoir conditions. Through “temporary shut-off–breakthrough–temporary shut-off,” the polymer microspheres were able to change the fluid flow rate and streamlines, mobilize residual oils, and enhance the oil recovery rates.

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%.

scholarly journals Mixed scaling control technology of produced water in different layers of the Dingbian oil production plant

2021 ◽  
Vol 859 (1) ◽  
pp. 012033
Author(s):  
Liang Liu ◽  
Long Zhang ◽  
Gang Zhang ◽  
Lei Han ◽  
Tao Yu ◽  
...  
Keyword(s):  
Produced Water ◽  
Oil Production ◽  
Production Plant ◽  
Control Technology

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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