Laboratory study of an anti‐temperature and salt‐resistance surfactant‐polymer binary combinational flooding as EOR chemical

Abstract

Experimental studies were conducted to enhance the oil recovery by a surfactant-polymer binary combinational flooding system. The surfactant-polymer binary combinational flooding was obtained by mixing the surfactants with the poly(AM-NVP-AS)-1 which was an anti-temperature and salt-resistance tercopolymer and successfully synthesized via free radical polymerization using acrylamide (AM), N-vinyl pyrrolidone (NVP), allyl sulfonate (AS) as raw materials. The initiator was redox system including watersoluble azo compound (AIBAÁ2HCl) and sodium bisulfite (NaHSO 3 ). Petroleum carboxylate dodecyl dibasic carbonylic acid sodium (C12DAS) and carboxyl betaine dodecyl dimethyl betaine (C12DB) were selected in this article. Compared with the surfactant-HPAM, the surfactant-poly(AM-NVP-AS)-1 binary combinational system showed higher apparent viscosity and lower interfacial tension at high temperature and salinity conditions as the result of a better capacity of anti-temperature, salt-resistance, and swept volume. The recovery could enhance over 17% based on the core flooding test under the mineralization of 10,000 mg=L at 65 C.

Complexation of Surfactant/β‐Cyclodextrin to Inhibit Surfactant Adsorption onto Sand, Kaolin, and Shale for Applications in Enhanced Oil Recovery Processes. Part III: Oil Displacement Evaluation

“…Extensive research has been conducted related to the evaluation and development of highly effective surfactants for EOR chemical flooding [5,[11][12][13][14]. Nonetheless, the adsorption of surfactant onto reservoir rock is a serious problem that compromises the technical and economic success of surfactant flooding for EOR.…”

“…A suitable surfactant for chemical EOR flooding requires several characteristics besides the capability of lowering the IFT to ultralow values; these properties are thermal stability, in some cases, surfactant tolerance to elevated ionic strength, low adsorption towards the liquidsolid interface, effectiveness in producing the appropriate type of oil-water emulsion, and affordable prices for field applications. Extensive research has been conducted related to the evaluation and development of highly effective surfactants for EOR chemical flooding [5,[11][12][13][14]. Nonetheless, the adsorption of surfactant onto reservoir rock is a serious problem that compromises the technical and economic success of surfactant flooding for EOR.…”

Pore-scale investigation of residual oil displacement in surfactant–polymer flooding using nuclear magnetic resonance experiments

“…Oil was removed, as the emulsion was displaced through the formation, rather than tending to adhere to pore surfaces, resulting in an incremental oil recovery. In summary, the incremental oil recovery was attributed to the synergism between polymer and surfactant (Kendall and Martin 2007;Lai et al 2014). …”

Effect of sodium dodecyl benzene sulfonate to the displacement performance of hyperbranched polymer

“…It because that the reduction of oil-water interfacial tension was actually a dynamic process of surfactants adsorption on the oil-water interface. The added polymer increased the viscosity of SP solution, and increased the surfactants' desorption time on the oil-water interface as well, hence, the t min was increased [29].…”

“…The phenomenon was due to the polymer molecules enriched in the aqueous phase that more active components were brought into the aqueous phase, leading to the change of the surfactant partition coeffi cient in oil phase/aqueous phase. After being added to the solution, the polymer was adsorbed mainly at the oil-water interface, which resulted in the decrease of the surfactants' adsorption area, and increasing the interfacial tension as well [29].…”