Investigation on Polymer Reutilization Mechanism of Salt-Tolerant Modified Starch on Offshore Oilfield

Dai, Caili; Yang, Shuai; Wu, Xuepeng; Liu, Yifei; Peng, Dongxu; Wang, Kai; Wu, Yining

doi:10.1021/acs.energyfuels.6b00840

Cited by 12 publications

(11 citation statements)

References 27 publications

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“…the crosslinked gel maintained mechanical integrity over the extended timescale of 1800 s in our rheological measurements. The sample showed constant elasticity of ~ 10 KPa in the range of 1800 s, which is similar to the gel strength at the shorter time period of 150 s. Compared to gellike conglomeration prepared from salt tolerant modified starch and hydrolyzed poly(acrylamide) with viscosity of less than 1000 mP.S having in-situ gel features, the re-crosslinked gels showed superior mechanical behavior with elasticity of 10 KPa [27]. In addition, the re-crosslinking ability and gel strength of the re-crosslinkable gels were independent of the gel concentration in brine, which was in stark contrast to the mechanical properties of in-situ gel as determined by gelant concentration.…”

mentioning

confidence: 66%

Mechanically robust re-crosslinkable polymeric hydrogels for water management of void space conduits containing reservoirs

Wang

Long

Ding

et al. 2017

Chemical Engineering Journal

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A unique preformed particle gel with re-crosslinkable ability to reform bulk gel for chemical enhanced oil recovery of void space conduits containing reservoir is described herein. The formation of the bulk gel was achieved by reversible ionic crosslinks of the preformed particle gels as induced by brine under reservoir conditions. The re-crosslinked hydrogel with ionic features showed rubber-like mechanical behaviors, a critical parameter of the particle gels to increase plugging efficiency. The re-crosslinking ability of the preformed particle gels under different salinity could be controlled by tuning the ionic interactions within the hydrogel. In addition, the long-term thermal stability of the re-crosslinked bulk gel has been demonstrated. Furthermore, the re-crosslinked bulk gels could significantly reduce permeability of large fractures as demonstrated by core flooding experiments compared with traditional preformed particle gels. The re-crosslinkable bulk gel with robust mechanical properties could offer the candidate to block void space conduits containing reservoirs for enhanced oil recovery.

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mentioning

confidence: 66%

Mechanically robust re-crosslinkable polymeric hydrogels for water management of void space conduits containing reservoirs

Wang

Long

Ding

et al. 2017

Chemical Engineering Journal

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“…The limiting conditions include reservoir temperature, permeability, temperature, reservoir crude oil viscosity, water salinity, and so forth. [6][7][8] As one example, the salinity of the prepared polymer aqueous solution is too high, which seriously hinders the application of polymer flooding technology, 9,10 because most of the water sources for polymer preparation are groundwater or produced from sewage. [11][12][13] Different metal cations in aqueous solution exert different effects on polymers.…”

Section: Introductionmentioning

confidence: 99%

Effect of micro‐aggregation behavior on the salt tolerance of polymer solutions

Zhu

Shi

et al. 2020

J of Applied Polymer Sci

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Polymer solution for oil displacement is mostly used in the middle and late stage of water flooding reservoir development, and reservoir groundwater conditions are often one of the main conditions restricting polymer application. Therefore, it is necessary to develop salt tolerance of polymer solutions with different aggregation behaviors, so as to facilitate the synthesis and optimization of suitable polymer systems. The differences in the micro‐aggregation behavior of three polymers with different molecular structures were explored. On this basis, the effects of divalent metal cations on the properties of the polymer solutions were analyzed by assessing the micro‐aggregation behavior, apparent viscosity, hydrodynamic size, and shear rheological characteristics. The results showed that the linear partially hydrolyzed polyacrylamide (HPAM) was seriously affected by divalent cations, and the viscosity decreased obviously. The aggregation behavior of the polymer changed by hydrophobic association can enhance the salt tolerance of the solution. The hydrophobically modified partially hydrolyzed polyacrylamide (HMPAM) with “chain beam” aggregation behavior has strong intermolecular connection, which enables it to withstand the content of calcium and magnesium ions of 1100 mg l−1. When the content of calcium and magnesium ions exceeds 600 mg l−1, dendritic hydrophobically associating polymer (DHAP) will destroy the interaction between molecular chains, resulting in the decrease of apparent viscosity and hydrodynamic size. For polymer flooding in high‐salinity reservoir, salt tolerant polymer system can be constructed by optimizing molecular weight and hydrophobic group content.

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“…However, most Chinese oil field reservoirs are continental deposits with serious heterogeneity and prominent interlayer contradictions. Under the traditional injection method, 7 ASP solution is injected into high‐permeability reservoirs in large amounts, 8‐10 while it is injected into low‐permeability reservoirs in small amounts, and the compatibility of low‐permeability reservoirs with ASP solution is poor, 11‐13 resulting in a poor production degree and low total oil recovery in low‐permeability reservoirs. Therefore, in order to improve the total oil recovery of heterogeneous oil layers, a layered injection method which is for the different levels of oil permeability is proposed for Daqing Oilfield, and the method is shown in Figure 1 14,15 .…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of ASP flooding to improve oil recovery in heterogeneous reservoirs by layered injection approach

Huang

et al. 2020

Energy Science & Engineering

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To improve the oil displacement effect of ASP (alkali/surfactant/polymer) solution in heterogeneous oil reservoirs, layered injection technology is proposed for the first time for Daqing Oilfield. The technology uses partial pressure tools to control the injection amount of ASP solution in high‐permeability oil layers and uses a partial quality tool in low‐permeability oil layers. To study the experimental effect of this layered injection technology, the relationships between the different permeability, molecular weight, and concentration of the ASP solution, as well as the resistance coefficient and residual resistance coefficient, are first established, and then, a layered injection experimental model is established to carry out experimental research on injection capacity and oil displacement capacity. The experimental results show that the smaller the range of the core permeability is, the larger the molecular weight and concentration of the ASP solution are, and the poorer the injection capacity of the ASP solution is. After the action of a partial pressure tool and a partial quality tool, the injection capacity of ASP solution is improved to different degrees, and the oil displacement effect of low‐permeability cores is significantly improved, while the total oil recovery is increased, and the total oil recovery of heterogeneous cores under different conditions is increased by 1.4%‐4.05%. This experiment is of great significance to the study of improving the oil recovery of heterogeneous reservoirs.

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Investigation on Polymer Reutilization Mechanism of Salt-Tolerant Modified Starch on Offshore Oilfield

Cited by 12 publications

References 27 publications

Mechanically robust re-crosslinkable polymeric hydrogels for water management of void space conduits containing reservoirs

Mechanically robust re-crosslinkable polymeric hydrogels for water management of void space conduits containing reservoirs

Effect of micro‐aggregation behavior on the salt tolerance of polymer solutions

Experimental evaluation of ASP flooding to improve oil recovery in heterogeneous reservoirs by layered injection approach

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