Improvement of Evaluation Methods for Deep Fluid Diverting Agents

2011 ◽  
Vol 402 ◽  
pp. 666-670
Author(s):  
Yi Fei Liu ◽  
Xiao Dan Fang
Keyword(s):  
Evaluation Method ◽  
High Water ◽  
Salt Resistance ◽  
Evaluation Methods ◽  
Practical Significance ◽  
Injection Process ◽  
Profile Control ◽  
High Water Cut ◽  
Water Cut ◽  
Resistance Performance

The main oil fields in China have gone gradually into the high or extra-high water cut production period, and conventional profile control technologies already cannot meet oilfields’ production requirements. The research and application of new fluid diverting technologies has got many new progresses, but their validity term is relatively short in the aspect of improving the high water cut oil reservoir. Based on the capillary bundle model, a comprehensive performance evaluation method of fluid diverting agents has been proposed, through systematical analysis of the fluid diverting agents evaluation methods at home and abroad and their existing problems, and all-sided understanding of the present reservoir situation. The experimental results showed that this method could effectively and comprehensively evaluate the fluid diverting agents’ diverting effect, shear resistance performance, temperature resistance performance and salt resistance performance, and could optimize injection process parameters. It has the important and practical significance to improve the duty validity of the fluid diverting agents.

Research on Production Decrease Regularity for an Extra High Water Cut Stages of Xingnan Development Zone

2014 ◽  
Vol 1010-1012 ◽  
pp. 1654-1664
Author(s):  
Ji Cheng Zhang ◽  
You Lv ◽  
Qi Li ◽  
Xiao Yue Wang
Keyword(s):  
High Water ◽  
Practical Significance ◽  
Type Curve ◽  
Development Zone ◽  
Well Pattern ◽  
Dislocation Type ◽  
Binary Regression Analysis ◽  
High Water Cut ◽  
Water Cut ◽  
Error Method

In recent years, Xingnan development zone have totally gone into high water cut stages and high recovery degree reserves from the partial period, facing with a stern fact that it transitions from a basic injected and produced fluid balance to a serious imbalance. Therefore, it is of important practical significance for predicting the production of remaining oil and improving recovery efficiency that strengthen the research of diminishing prediction of each well pattern. In this paper, by using a series means of graphical method, try and error method, curvilinear dislocation, type curve matching method and binary regression analysis, we comprehensively judged the production decline types of different well patterns, and calculate the production decline rate of each set of well pattern..

Physical simulation on system of deep profile control and flooding on high water cut reservoir

2018 ◽  
Vol 35 (2) ◽  
pp. 179
Author(s):  
Xuedong SHI ◽  
Xiang'an YUE ◽  
Shengcai LING ◽  
Mingda DONG ◽  
Bin KONG
Keyword(s):  
Physical Simulation ◽  
High Water ◽  
Profile Control ◽  
High Water Cut ◽  
Water Cut ◽  
Deep Profile

Interaction between Cationic Nano Microsphere and HPAM

2013 ◽  
Vol 669 ◽  
pp. 208-216 ◽  
Author(s):  
Yue Liang Liu ◽  
Jin Wei Shen ◽  
Guang Hui Li ◽  
Gui Cai Zhang
Keyword(s):  
Electrostatic Interaction ◽  
Electrostatic Force ◽  
High Water ◽  
Control Agent ◽  
Hydrolysis Degree ◽  
Transmission Scan ◽  
Profile Control ◽  
High Water Cut ◽  
Water Cut ◽  
Particle Sizer

This paper intends to deal with one novel profile control agent formed by combination of HPAM and cationic microspheres with different cationic density (CD) by the method of micro-emulsion polymerization. Profile control is of great importance in well stimulation for current oilfield with high water cut. The main profile control agents now are polymer or polymer microspheres. Each of these agents has its own performance advantages. The novel profile control agent is equipped with the advantages of both the agents mentioned above. Analyzed by transmission scan electron microscope (TSEM) and laser particle sizer, the particle size of the original synthesized microsphere and the swelled microsphere in water are 50-100nm and 1-3μm respectively. Analyzed by micro-electrophoresis, the surface potential arrives at its highest value at 30% of the cationic density; aggregation happens when CD is low and the electrostatic force is insufficient to keep the system stable. Due to electrostatic interaction, the synthesized system flocculates at a concentration of 0.02% separately. Measured at varied shear rates, the viscosity of the system can be significantly enhanced by electrostatic interaction. However, this enhancement is not obvious when the salinity is higher than 3%, which indicates that the increasing of viscosity is closely related to the salinity of solution. Moreover, by increasing hydrolysis degree of HPAM, the viscosity of the system can be improved by 20% additionally. Through core displacement test, the synthesized system is proved to have relatively good profile control performance.

scholarly journals A novel method for improving recovery of heavy oil reservoirs with high water cut based on polymer gel-assisted CO2 huff and puff

2021 ◽  
Author(s):  
Haiwei Lu ◽  
Zhenyuan Wang ◽  
Tong Peng ◽  
Jiapeng Zheng ◽  
Xiaoliang Yang ◽  
...  
Keyword(s):  
Heavy Oil ◽  
Apparent Viscosity ◽  
Retention Rate ◽  
High Water ◽  
Salt Resistance ◽  
Oil Reservoirs ◽  
Polymer Gel ◽  
Heavy Oil Reservoirs ◽  
High Water Cut ◽  
Water Cut

AbstractA novel enhanced oil recovery (EOR) method based on polymer gel-assisted carbon dioxide (CO2) huff and puff was developed aiming to improve the development effect of heavy oil reservoirs with high water cut. The polymer gel prepared using partially hydrolyzed polyacrylamide (HPAM), hexamethylenetetramine, phenol, resorcinol, oxalic acid, and thiocarbamide as raw materials had a special network structure to overcome the challenge of significant heterogeneity in heavy oil reservoirs. The strength of polymer gel reached the maximum value 20,000 mPa·s within 22 h. The temperature resistance and salt resistance of polymer gel directly determined the plugging effect. The polymer gel was placed for 190 days at 85 ℃, and its apparent viscosity retention rate was 66.4%. The salt resistance experiments showed that the apparent viscosity retention rate of this polymer gel at 1.8 wt % NaCl, 0.045 wt % CaCl2, 0.045 wt % MgCl2 was 71.3%, 78.5%, 71.4%, respectively. Huff and puff experiments confirmed that this method could be used to increase the sweep volume and improve the oil displacement efficiency of heavy oil reservoirs with high water cut. Furthermore, the EOR of this method was better than that of water huff and puff, polymer gel huff and puff or CO2 huff and puff.

scholarly journals Mechanism of Enhanced Oil Recovery for In-Depth Profile Control and Cyclic Waterflooding in Fractured Low-Permeability Reservoirs

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Daiyin Yin ◽  
Wei Zhou
Keyword(s):  
Enhanced Oil Recovery ◽  
Depth Profile ◽  
Oil Recovery ◽  
Water Injection ◽  
High Water ◽  
Low Permeability ◽  
Profile Control ◽  
High Water Cut ◽  
Water Cut ◽  
Low Permeability Reservoirs

When fractured low-permeability reservoirs enter a high water cut period, injected water always flows along fractures, water cut speeds increase rapidly, and oil production decreases quickly in oil wells. It is difficult to further improve the oil recovery of such fractured low-permeability reservoirs. In this paper, based on the advantages of in-depth profile control and cyclic water injection, the feasibility of combining deep profile control with cyclic water injection to improve oil recovery in fractured low-permeability reservoirs during the high water cut stage was studied, and the mechanisms of in-depth profile control and cyclic waterflooding were investigated. According to the characteristics of reservoirs in Zone X, as well as the fracture features and evolution mechanisms of the well network, an outcrop plate fractured core model that considers fracture direction was developed, and core displacement experiments were carried out by using the HPAM/Cr3+ gel in-depth profile control system. The enhanced oil recovery of waterflooding, cyclic water injection, and in-depth profile control, as well as a combination of in-depth profile control and cyclic water injection, was investigated. Moreover, variations in the water cut degree, reserve recovery percentage, injection pressure, fracture and matrix pressure, and water saturation were monitored. On this basis, the mechanism of enhanced oil recovery based on the combined utilization of in-depth profile control and cyclic waterflooding methods was analyzed. The results show that in-depth profile control and cyclic water injection can be synchronized to further increase oil recovery. The recovery ratio under the combination of in-depth profile control and cyclic water injection was 1.9% higher than that under the in-depth profile control and 5.6% higher than that under cyclic water injection. The combination of in-depth profile control and cyclic water injection can increase the reservoir pressure; therefore, the fluctuation of pressure between the matrix and its fractures increases, more crude oil flows into the fracture, and the oil production increases.

Investigation on Circulating Path of Injected Water for High Water-Cut Oilfield

2014 ◽  
Vol 1073-1076 ◽  
pp. 2201-2204
Author(s):  
Sui Ting Zhao ◽  
Qi Li ◽  
Xiao Ru He ◽  
Kao Ping Song ◽  
Ji Cheng Zhang
Keyword(s):  
Mathematical Model ◽  
Fuzzy Theory ◽  
Water Injection ◽  
High Water ◽  
Water Flooding ◽  
Profile Control ◽  
Production Wells ◽  
High Water Cut ◽  
Water Cut ◽  
Swept Volume

In this paper, the indexes have been determined for identifying ineffective injection-production circulation and corresponding mathematical model was constructed with fuzzy theory. Application examples show that this method is simple, fast and accurate. For high and extra-high water cut oilfields, because of the long-term erosion of injected water, there are some high penetrative channels between the injection and production wells, resulting in most injected water along the channel to cause the invalid injection and production, for which it is hard to increase water flooding swept volume, causing flooding and high water cut well and reducing oil production. To improve the effectiveness of water injection to achieve stable yields, it is important to take the measures of ineffective injection-production wells profile control, plugging and so on for fast and accurate identifying ineffective injection-production wells. To that end, this paper applied fuzzy theory to establishing the mathematical model for identifying ineffective injection-production wells.

The Application of Multistage Fuzzy Comprehensive Evaluation Mathematics Method for the Analysis of Determining the Remaining Oil in Ultra-High Water-Cut Oilfield

2014 ◽  
Vol 926-930 ◽  
pp. 4429-4432 ◽  
Author(s):  
Chun Mei You ◽  
Jia Chun Wang ◽  
Xiao Jun Sun ◽  
Xian Hu Lv ◽  
Shao Ming Song
Keyword(s):  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
High Water ◽  
Water Flooding ◽  
Oil Distribution ◽  
Remaining Oil ◽  
High Water Cut ◽  
Water Cut ◽  
Mathematics Method

After the water flooding sandstone oilfield entering the ultra-high water-cut developing phase, the remaining oil distribution has become increasingly fragmented, how to quantitative distinguish the remaining oil potential is the key to influence oilfield development, using multilevel fuzzy comprehensive evaluation mathematics method, comprehensive analyzed the classification reservoir’s producing conditions during the ultra-high water-cut developing phase, established a quantitative evaluation method from geological and develop factors, solved the problem of analyzing remaining oil in deferent kinds of reservoirs, realized the quantitative characterization of remaining oil in the ultra-high water-cut oilfield.

A Fuzzy Method to Judge Water Passages with Ineffective Injection-Production for Heterogeneous Sandstone Reservoir

2012 ◽  
Vol 524-527 ◽  
pp. 1306-1309 ◽  
Author(s):  
Peng Xiao Sun
Keyword(s):  
Mathematical Model ◽  
Fuzzy Theory ◽  
Water Injection ◽  
High Water ◽  
Water Flooding ◽  
Profile Control ◽  
Production Wells ◽  
High Water Cut ◽  
Water Cut ◽  
Swept Volume

In this paper, the indexes have been determined for identifying ineffective injection production circulation and corresponding mathematical model was constructed with fuzzy theory. Application examples show that this method is simple, fast and accurate. For high and superhigh water cut oilfields, because of the long-term erosion of injected water, there are some high penetrative channels between the injection and production wells, resulting in most injected water along the channel to cause the invalid injection and production, for which it is hard to increase water flooding swept volume, causing flooding and high water cut well and reducing oil production. To improve the effectiveness of water injection to achieve stable yields, it is important to take the measures of ineffective injection-production wells profile control, plugging and so on for fast and accurate identifying ineffective injection-production wells. To that end, this paper applied fuzzy theory to establishing the mathematical model for identifying ineffective injection-production wells.

Preventing Proppant and Formation-Sand Production in High Water Cut, Heavy-Oil Wells: A Field Study from Argentina

2009 ◽  
Author(s):  
Daniel Daparo ◽  
Luis Soliz ◽  
Eduardo Roberto Perez ◽  
Carlos Iver Vidal Saravia ◽  
Philip Duke Nguyen ◽  
...  
Keyword(s):  
Field Study ◽  
Heavy Oil ◽  
High Water ◽  
Oil Wells ◽  
Sand Production ◽  
High Water Cut ◽  
Water Cut
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