Starch graft copolymer and polymer gel applied in Bohai oilfield for water plugging and profile control and their mechanisms

Cao, Weijia; Xie, Kongliang; Wang, Xiaoyan; Lu, Xiaofeng; He, Xin; Xu, Guorui; Li, Xiang

doi:10.1080/12269328.2020.1732838

Cited by 18 publications

(7 citation statements)

References 17 publications

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“…Artificial homogeneous cores cemented by quartz sands (4.5 cm × 4.5 cm × 30 cm) were used in this study to investigate the plugging ratio of the composite gel. , The permeabilities of these cores were approximately 9000, 5000, and 2000 mD, respectively, and their pore structures and permeabilities were similar to those of reservoir cores in the Bohai oilfield. The procedures to prepare the artificial cores can be found in the Chinese patent “Quartz sand epoxy resin cementation heterogeneity model making method”, , and the picture of the entire core coated with epoxy resin is shown in Figure .…”

Section: Methodsmentioning

confidence: 99%

Synthesis and Performance Evaluation of an Organic/Inorganic Composite Gel Plugging System for Offshore Oilfields

Xie

Liu³

et al. 2022

ACS Omega

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In this article, we developed a new composite gel for plugging dominant fluid flow channels in offshore oilfields. The composite gel was synthesized by organic and inorganic gel networks interpenetrating into a compact three-dimensional spatial network structure, resulting in a good plugging effect. The performance of the composite gel was evaluated from the aspects of gelling characteristics and gel microstructure, while the plugging effect was evaluated through core experiments. The results showed that the influencing order of each component on gelling was acrylamide > cross-linking agent > urea > initiator > polyaluminum chloride. The initial viscosity of the composite gel was about 5–6 mPa·s, and it had good plugging abilities in different permeability cores. In comparison with inorganic gels (plugging ratio of 77.2%) or organic gels (84.8%), the composite gel system has a plugging ratio of up to 99.5% using a core with water permeability of 4300 mD. Besides, the reservoir applicability of the composite gel was studied, and the results suggested that the composite gel system had good resistance to dilution, mechanical shear, oil corrosion, and aging and could be quickly removed after plugging.

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Section: Methodsmentioning

confidence: 99%

Synthesis and Performance Evaluation of an Organic/Inorganic Composite Gel Plugging System for Offshore Oilfields

Xie

Liu³

et al. 2022

ACS Omega

Self Cite

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“…Some oil wells are prone to water problems due to formation heterogeneity, different fluid flows, long-term water flooding and casing damage, all of which have severe effects on the economic benefits and production life of oil wells [ 87 ]. Profile control and water shutoff are common methods for enhancing the oil recovery in water flooding oil fields.…”

Section: Polymer Gels For Oil–gas Productionmentioning

confidence: 99%

Polymer Gels Used in Oil–Gas Drilling and Production Engineering

Han

Sun

et al. 2022

Gels

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Polymer gels are widely used in oil–gas drilling and production engineering for the purposes of conformance control, water shutoff, fracturing, lost circulation control, etc. Here, the progress in research on three kinds of polymer gels, including the in situ crosslinked polymer gel, the pre-crosslinked polymer gel and the physically crosslinked polymer gel, are systematically reviewed in terms of the gel compositions, crosslinking principles and properties. Moreover, the advantages and disadvantages of the three kinds of polymer gels are also comparatively discussed. The types, characteristics and action mechanisms of the polymer gels used in oil-gas drilling and production engineering are systematically analyzed. Depending on the crosslinking mechanism, in situ crosslinked polymer gels can be divided into free-radical-based monomer crosslinked gels, ionic-bond-based metal cross-linked gels and covalent-bond-based organic crosslinked gels. Surface crosslinked polymer gels are divided into two types based on their size and gel particle preparation method, including pre-crosslinked gel particles and polymer gel microspheres. Physically crosslinked polymer gels are mainly divided into hydrogen-bonded gels, hydrophobic association gels and electrostatic interaction gels depending on the application conditions of the oil–gas drilling and production engineering processes. In the field of oil–gas drilling engineering, the polymer gels are mainly used as drilling fluids, plugging agents and lost circulation materials, and polymer gels are an important material that are utilized for profile control, water shutoff, chemical flooding and fracturing. Finally, the research potential of polymer gels in oil–gas drilling and production engineering is proposed. The temperature resistance, salinity resistance, gelation strength and environmental friendliness of polymer gels should be further improved in order to meet the future technical requirements of oil–gas drilling and production.

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“…Polymer flooding technology has been gradually popularized in tertiary recovery industrialization in onshore oilfields, and has achieved good economic and social benefits [1][2][3][4][5][6][7][8]. Since firstly application of polymer flooding in the Bohai Oilfield, offshore polymer flooding has achieved significant results [9][10][11][12]. Polymer dissolution process is obviously different from a low-molecular substance, because exists swelling and dissolves process.…”

Section: Introductionmentioning

confidence: 99%

Optimization of a High-pressure Water-Powder Mixing Prototype for Offshore Platforms

Zheng¹,

Yaln²,

Xia³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

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A new device is designed to promote the mixing of high-pressure water jets and powders in typical industrial applications. The water and powder mixing devices traditionally used on offshore platforms are detrimentally affected by the geometrical configuration of the water nozzle and the powder spraying pipe, which are parallel, resulting in small intersecting volumes of liquid and powder. By allowing the related jets to intersect, in the present work the optimal horizontal distance, vertical distance and intersection angle are determined through a parametric investigation. It is also shown that such values change if the number of water layers is increased from one to two. In such a case, the water and powder intersection volume can be greatly increased because the trajectory of the dry powder particles becomes more chaotic.

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Starch graft copolymer and polymer gel applied in Bohai oilfield for water plugging and profile control and their mechanisms

Cited by 18 publications

References 17 publications

Synthesis and Performance Evaluation of an Organic/Inorganic Composite Gel Plugging System for Offshore Oilfields

Synthesis and Performance Evaluation of an Organic/Inorganic Composite Gel Plugging System for Offshore Oilfields

Polymer Gels Used in Oil–Gas Drilling and Production Engineering

Optimization of a High-pressure Water-Powder Mixing Prototype for Offshore Platforms

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