Solutions of Long-Chain Alcohols and Surfactants for Enhanced Oil Recovery in High-Temperature Low-Permeability Reservoirs

Li, Yueyang; Zhao, Jinzhou; Pu, Wanfen; Zhao, Tong

doi:10.1007/s10553-014-0529-x

Cited by 4 publications

(1 citation statement)

References 14 publications

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“…Secondly, the forming of the micro-nano structure hydrophobic layer on the surface of quartz sand may reduce the adhesion force between water and proppant. On the other hand, it can decrease the thickness of hydration film and expand the pore radius effectively, then the flow resistance of injection water through the pores will decrease obviously and the injection water will flow smoothly [29][30][31].…”

Section: Laboratory Displacement Testsmentioning

confidence: 99%

Improving water-injection performance of quartz sand proppant by surface modification with surface-modified nanosilica

Liu

Guo

Lian

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Section: Laboratory Displacement Testsmentioning

confidence: 99%

Improving water-injection performance of quartz sand proppant by surface modification with surface-modified nanosilica

Liu

Guo

Lian

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Preparation and Characterization of Chemical Agents for Augmenting Injectivity in Low Permeability Reservoirs

Zhao

Yang

2018

Journal of Energy Resources Technology

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In this paper, experimental techniques have been developed to prepare and characterize chemical agents for augmenting injectivity in low permeability reservoirs. First, chemical agents are selected, formulated, and optimized on the basis of interfacial tension (IFT), scale inhibition ratio, and clay particle size distribution and specific surface area. The spinning drop method is utilized to measure the IFT between crude oil and the formulated solution, while contact angle between brine and rock surface is measured to examine effect of the chemical agents on the rock wettability. Also, scale inhibition ratio and antiswelling ratio are, respectively, measured by performing static-state scale inhibition experiments and centrifugation experiments. Then, displacement experiments are conducted to evaluate injectivity improvement after one pore volume (PV) of such formulated chemical agents has been injected into a core plug. It is found that the optimized solution consists of 0.15 wt % fluorocarbon surfactant FC-117, 4.00 wt % isopropanol, 1.20 × 10−3 wt % scale inhibitor 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA), and 1.50 wt % clay stabilizer diallyl dimethyl ammonium chloride (DMDAAC). The IFT between crude oil and the optimized solution can be reduced to 5.36 × 10−3 mN/m within a short time, while the scale inhibition ratio and antiswelling ratio are measured to be 94.83% and 86.96%, respectively. It is found from comprehensive evaluation experiments that such a formulated and optimized solution can not only alter the rock surface from oil-wet to water-wet but also reduce the scale formation of the reservoir brine. In addition, it is shown from displacement experiments that the pressure is decreased by 34.67% after the injection of such formulated solution. When the formulated solution contains 0–300,000 mg/L sodium chloride (NaCl) and 0–5000 mg/L calcium chloride (CaCl2) at 50–90 °C, the IFT between crude oil and the formulated solution can be reduced to lower than 10−2 mN/m.

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pH-Responsive Supramolecular Gelling Agents Used in EOR and Their Potential as Fracking Fluids

Yegin

Temizel²,

Yegin

et al. 2017

Day 1 Mon, November 13, 2017

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Hydraulic fracturing is an important method to recover shale oil and gas that has drastically increased U.S. energy production in recent decades. Shales are low permeability formations where natural resources are trapped, and require a well-planned hydraulic fracturing process and a highly developed fracturing (fracking) fluid for efficient oil/gas recovery. In this study, a pH-responsive solution synthesized by supramolecular assembly of maleic acid and an amino-amide in an aqueous media is described as a potential fracking fluid owing to its mobility control, proppant carrying and settling capacities. Previous investigations on this solution system had shown its large potential to replace displacement fluids in EOR due to pH-tunable and reversible viscosity behavior. The main working mechanism is that; the initial viscosity of injected solution is kept at moderate/high values to easily transport proppants and easily inject the fluid; and then decreased when the solution reaches a position near fissures for settling of proppants. It has been reported by rheology tests of the developed fracking fluid, which consists of the supramolecular solution and proppants (silica sand), viscosity can be changed about 1600 times from pH 3.8 to pH 8.3 in a reversible fashion at only 2 wt.% concentration. On the other hand, sedimentation studies indicated that the sedimentation speed of the silica proppants decreased around five orders of magnitude from pH 4 to pH 8, again in a reversible way. Furthermore, experimental studies revealed that the developed supramolecular solutions have both reversible pH-responsive properties, and tolerance against high salinities and elevated temperatures. Another outstanding property of these supramolecular solutions is their self-healing feature which enables them to disassemble and reassemble upon exposure to extreme shear stresses, while polymer viscosifying agents the fracking fluids degrade and break up under similar conditions. The supramolecular assembly system discussed in this study has a promising potential to become next-generation fracking fluids with its outstanding properties including but not limited to pH-sensitivity, reversible viscosity, high proppant transfer capacity, tolerance to high temperatures and salinity, self-healing behavior, environmental friendliness and sustainability.

show abstract

Solutions of Long-Chain Alcohols and Surfactants for Enhanced Oil Recovery in High-Temperature Low-Permeability Reservoirs

Cited by 4 publications

References 14 publications

Improving water-injection performance of quartz sand proppant by surface modification with surface-modified nanosilica

Improving water-injection performance of quartz sand proppant by surface modification with surface-modified nanosilica

Preparation and Characterization of Chemical Agents for Augmenting Injectivity in Low Permeability Reservoirs

pH-Responsive Supramolecular Gelling Agents Used in EOR and Their Potential as Fracking Fluids

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