Chemical treatment of oilfield wastewater and the effect of temperature on treatment efficiency: A review

Husain, Arafat; Al‐Harthi, Mamdouh A.

doi:10.1016/j.petrol.2022.111089

Cited by 14 publications

(7 citation statements)

References 161 publications

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“…Cationic polymers can destroy the stability of oil droplets in water through electrostatic neutralization and achieve oil–water separation through flocculation. It has the advantages of low dosage and fast flocculation, but it will produce sticky flocs and oil sludge. , Nonionic polyether can destroy the collision stability of oil droplets in water by reducing the strength of the water–oil interface and realizes oil–water separation through demulsification. There is no oil sludge produced when nonionic polyether is used. , Because the oil sludge produced by a nonionic polyether water clarifier is much less than that of a cationic polymer, , it has been increasingly widely used.…”

Section: Introductionmentioning

confidence: 99%

Empirical Relationship among the Parameters in HLD Equation of Block Polyether Water Clarifier

Wang,

Zhang,

et al. 2024

ACS Omega

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In this work, the empirical relationship among three apparent parameters in the hydrophilic−lipophilic deviation (HLD) equation was studied to provide help in using the HLD equation to design a block polyether water clarifier for treating produced water in an oilfield. Ten block polyethers (including six linear polyethers and four branched polyethers) were prepared, and their HLD equations were measured. By curve fitting, the empirical relationship among apparent hydrophobicity characteristic (K), apparent characteristic curvature (Cc n ), and apparent temperature coefficient (c t ) of block polyether were obtained: K = 9.32c t , Cc n = 18e −24.5K (for linear polyether), and Cc n = 3.7e −20.8K (for branched polyether). By introducing these relationships into the HLD equation and combining an empirical relationship between propylene oxide/ethylene oxide (mole ratio) in a block polyether and K/Ccn, a new block polyether was designed to treat the produced water. The treatment result confirmed the reliability of these empirical relationships. The results expand the practical application of HLD theory and are useful for the development of a block polyether water clarifier.

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Section: Introductionmentioning

confidence: 99%

Empirical Relationship among the Parameters in HLD Equation of Block Polyether Water Clarifier

Wang,

Zhang,

et al. 2024

ACS Omega

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“…ASP produced water contains residual oil droplets and chemicals, which has the characteristics of high emulsification, strong stability, and difficult oil-water separation ( Wu D. et al, 2021 ; Wu M. et al, 2021 ), and is a kind of oilfield sewage that is difficult to treat. Because produced water contains many toxic compounds, it will do great harm to the environment and biology if it is discharged into the environment ( Husain and Al-Harthi, 2023 ). With the increasingly strict national environmental laws and regulations and the improvement of environmental awareness of oil companies, in order to meet the environmental laws and regulations and the sustainable development of oil companies, oil companies reuse or re-inject oilfield produced water after treatment ( Mao et al, 2022 ).…”

Section: Introductionmentioning

confidence: 99%

Efficiency and microbial community characteristics of strong alkali ASP flooding produced water treated by composite biofilm system

Dong

Zhang

et al. 2023

Front. Microbiol.

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Strong alkali alkali-surfactant-polymer (ASP) flooding produced water is a by-product of oil recovery, and it is a stable system composed of petroleum, polyacrylamide, surfactant, and inorganic salts. Efficient, green, and safe ASP produced water treatment technology is essential for oilfield exploitation and environmental protection. In this study, an anaerobic/anoxic/moving bed biofilm reactor with a microfiltration membrane was established and assessed for the real strong alkali ASP flooding produced water (pH 10.1–10.4) treatment. The results show that the average removal rates of COD, petroleum, suspended solids, polymers and surfactants in this process are 57, 99, 66, 40, and 44%, respectively. GC-MS results show that most of the organic compounds such as alkanes and olefins in the strong alkali ASP produced water are degraded. Microfiltration membrane can significantly improve the efficiency and stability of sewage treatment system. Paracoccus (AN), Synergistaceae (ANO) and Trichococcus (MBBR) are the main microorganisms involved in the degradation of pollutants. This study reveals the potential and adaptability of composite biofilm system in treating the produced water of strong alkali ASP produced water.

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“…1−3 Water plugging treatment has not only become an economic problem but also affects the environment. 4,5 Tahe oilfield is located in the middle section of the northern Tarim Basin in Northwest China. Its Ordovician carbonate reservoir environment is dominated by fracture type, karst cave type, and fracture−fracture cave type, 6 which belongs to the fractured depression reservoir with strong heterogeneity.…”

Section: Introductionmentioning

confidence: 99%

“…In the operation of the oil and gas industry, many oilfields have entered the middle or late stage, resulting in increased water production problems that have always existed; this leads to a large amount of residual oil in the porous media of reservoirs. − Water plugging treatment has not only become an economic problem but also affects the environment. , Tahe oilfield is located in the middle section of the northern Tarim Basin in Northwest China. Its Ordovician carbonate reservoir environment is dominated by fracture type, karst cave type, and fracture–fracture cave type, which belongs to the fractured depression reservoir with strong heterogeneity .…”

Section: Introductionmentioning

confidence: 99%

Investigation of Polyvinyl Alcohol–Phenolic Aldehyde–Polyacrylamide Gel for the Application in Saline Oil Reservoirs for Profile Modification

Dong,

He,

et al. 2023

Energy Fuels

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Polymer gels are widely used in the oil and gas industry, and high-molecular-weight polymer gels have significant effects on reservoir water plugging operations. Based on nontoxic polyvinyl alcohol (PVA), its stability in solvents containing formation saltwater (Tahe oilfield, NW China) was studied, and the composite gel solution was prepared using saltwater. The polymerization mechanism of PVA with phenolic resin (PF) and polyacrylamide (PAM) was analyzed, using hexamethylenetetramine (HMTA) instead of formaldehyde for cross-linking, and the rheological properties of the prepared gel were tested; the results showed excellent elastic properties. The application value of the gel was evaluated by gelation performance, thermal stability, and indoor simulated core displacement. The gelation time of the PVA/PAM/PF gel at 130 °C was 4 h; after aging at 130 °C for 40 days, the gel strength of the polymer gel remained at the G level, and no dehydration occurred. The simulated core plugging results showed that the breakthrough pressure was 11.79 MPa and the plugging rate was 99.83%. Compared with the PAM/PF gel, the PVA/PAM/PF gel has a higher breakthrough pressure, which is beneficial to reduce the permeability of the porous medium.

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Chemical treatment of oilfield wastewater and the effect of temperature on treatment efficiency: A review

Cited by 14 publications

References 161 publications

Empirical Relationship among the Parameters in HLD Equation of Block Polyether Water Clarifier

Empirical Relationship among the Parameters in HLD Equation of Block Polyether Water Clarifier

Efficiency and microbial community characteristics of strong alkali ASP flooding produced water treated by composite biofilm system

Investigation of Polyvinyl Alcohol–Phenolic Aldehyde–Polyacrylamide Gel for the Application in Saline Oil Reservoirs for Profile Modification

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