Preparation and properties of multilayer assembled polymer gel microsphere profile control agents

2019 ◽  
Vol 59 (7) ◽  
pp. 1507-1516
Author(s):  
Dingjun Zhang ◽  
Wenjin Zhao ◽  
Yanfei Wu ◽  
Zhenbin Chen ◽  
Xianru Li
Keyword(s):  
Polymer Gel ◽  
Profile Control

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.

Effect of Dynamic Gelation of Polymer Gel in Porous Media: Permeability

2014 ◽  
Vol 535 ◽  
pp. 718-724
Author(s):  
Hai Yang Yu ◽  
Xiang Jun Liu ◽  
Wen Juan Ji ◽  
Hai Tao Gao ◽  
Bin Bin Xu
Keyword(s):  
Porous Media ◽  
Apparent Viscosity ◽  
Phenol Formaldehyde ◽  
Gelation Time ◽  
Phenol Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Polymer Gel ◽  
Gelation Process ◽  
Profile Control ◽  
The Relationship

Polymer gel is widely used in water shut-off and profile control. For success of conformance treatment, it is very important to study the dynamic gelation process of polymer gel, especially in porous media. Based on the systems of HPAM/ phenol formaldehyde resin (PFR), the dynamic gelation process in porous media was studied in an unconsolidated sandpack of the circulating device. The results showed that dynamic gelation time was much longer than static gelation time in ampoule bottle and porous media. With permeability increasing or injected speed decreasing, the dynamic initial gelation time increased but the dynamic initial gelation time varied unconspicuously. In dynamic gelation process, the system of HPAM/ PFR could be injected into in-depth of reservoir more easily. The relationship between permeability and apparent viscosity was in accordance with equation y=a (1-e-bx). The apparent viscosity after dynamic gelation was in contrast with linear velocity of b.

Research and Application of Deep Profile Control & Oil Displacement by Polymer Gel - Surfactant in High Salinity Oilfield

2013 ◽  
Vol 318 ◽  
pp. 491-495
Author(s):  
Yue Luo ◽  
Ding Wang ◽  
Lei Bai ◽  
Ke Jian Zha
Keyword(s):  
High Salinity ◽  
Liquid Water Content ◽  
Polymer Gel ◽  
Oil Displacement ◽  
Profile Control ◽  
Displacement Experiments ◽  
Injection Water ◽  
Weak Gel ◽  
Surfactant Composition ◽  
Deep Profile

A polymer gel-surfactant composition profile control technology has been developed, basing on the high salinity, especially high levels of Ca2+, Mg2+ in the injection water of the Hongshanzui oilfield. The construction parameters of deep profile control & oil displacement have been studied by performing core displacement experiments. The results show that the ratio of polymer gel slug and active agents slug is 1:0.3, the best ratio of strong polymer gel, medium polymer gel and weak polymer gel slug is 4:3:3. The way of combination is stronger gel slug + surfactant slug + in strong gel slug + weak gel slug + surfactant slug + strong gel sealing slug. The application effect of this technology in Hongshanzui oilfield is remarkable, the 12 tune flooding group daily oil production rose from 85t to 130t and the liquid water content decreased from 75% to 67%.

Development of Polymer Gel Plugging Removal Agent in Suizhong 361 Oilfield

2013 ◽  
Vol 860-863 ◽  
pp. 1026-1029 ◽  
Author(s):  
Guang Sheng Cao ◽  
Lei Wang ◽  
Gui Long Wang
Keyword(s):  
Oil Recovery ◽  
Control Mechanism ◽  
Practical Significance ◽  
Polymer Gel ◽  
High Permeability ◽  
Special Situation ◽  
Profile Control ◽  
The Cost ◽  
New Formula ◽  
Continuous Injection

Suizhong 361 offshore oilfield has applied polymer gel to profile control operations. With the continuous injection of the polymer gel, packers had not been put down in the whole of profile job because of the special situation of offshore oilfield. It has resulted that the polymer gel not only blocked layer segments of high permeability, but also blocked the rest lays. This situation makes the subsequent construction impossible and fails to reach the purpose of profile control. Therefore an effective blocking remover is necessary to break down reservoirs and open the low permeability layers, so that the polymer gel will be continued injecting into the reservoirs for subsequent construction. The purpose of profile will be achieved. Based on the actual blocking situation of Suizhong 361 oilfield, as well as the blockage removing mechanism of plugging removal agent and the profile control mechanism of polymer gel, a new plugging removal agent formula has been developed by screening and optimizing the type and mass concentration of blocking removal agent. Research shows that degradation rate of the new formula has reached above 90%, which has an important practical significance for enhancing oil recovery and reducing the cost of oil production.

Development and Evaluation of Salt-Resisting Polymer Gel Profile Control Agent

2013 ◽  
Vol 781-784 ◽  
pp. 426-430 ◽  
Author(s):  
Guang Yang ◽  
Jian Zhang ◽  
Xin Sheng Xue ◽  
Ying Xian Cui ◽  
Wen Sen Zhao
Keyword(s):  
High Temperature ◽  
Storage Modulus ◽  
Water Erosion ◽  
Control Agent ◽  
Polymer Gel ◽  
Laboratory Findings ◽  
Water Shutoff ◽  
Profile Control ◽  
Weak Gel

Be aimed at the characteristics of high temperature-salinity and severe heterogeneity of Bohai oilfield. This paper studies three different strength kinds of polymer gel profile control agents. Use storage modulus evaluates strength of polymer gel. the result indicate that the storage modulus of weak gel is between0.1 Pa and 1.0 Pa, the storage modulus of moderate gel is between1.0 Pa and 3.1 Pa, the maximal value of powerful gels storage modulus is11.9 Pa during 90 days. Core laboratory findings indicate that these different strength kinds of polymer gel have well formation sealing quality and endure washing out quality,40PV by water erosion , the formation sealing rate is up 90%.the experiment result of water shutoff and flooding oil indicate that the EOR is13.44% in heterogeneity core.

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