Progress of polymer gels for conformance control in oilfield

Kang, Wanli; Kang, Xin; Lashari, Zeeshan Ali; Zhou, Bobo; Yang, Hongbin; Sarsenbekuly, Bauyrzhan; Aidarova, Saule

doi:10.1016/j.cis.2021.102363

Cited by 86 publications

(43 citation statements)

References 106 publications

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“…Microgels are particles of cross-linked polymers (gels) 0.1–100 μm in size (according to the IUPAC Gold book) having a three-dimensional structure and capable of swelling in a solvent [ 33 ]. The swelling process is caused by conformational changes of the cross-linked polymer network [ 34 ]. The interest in microgels is due to their unique properties, as they combine the properties of three groups of compounds: colloidal substances, polymers, and surfactants (see Figure 4 ) by compiling the unique properties of each class, including structural integrity, functionalization, softness, deformability, permeability, and others [ 35 ].…”

Section: Methodsmentioning

confidence: 99%

“…Microgels are particles of cross-linked polymers (gels) 0.1-100 µm in size (according to the IUPAC Gold book) having a three-dimensional structure and capable of swelling in a solvent [33]. The swelling process is caused by conformational changes of the crosslinked polymer network [34]. The interest in microgels is due to their unique properties, It is known that the effectiveness of PPG macrogels is limited by the high permeability of the reservoir.…”

Section: Microgels For Reservoir Conformance Controlmentioning

confidence: 99%

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Review of Microgels for Enhanced Oil Recovery: Properties and Cases of Application

Ketova

Burin

Galkin

et al. 2022

Gels

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In todays’ world, there is an increasing number of mature oil fields every year, a phenomenon that is leading to the development of more elegant enhanced oil recovery (EOR) technologies that are potentially effective for reservoir profile modification. The technology of conformance control using crosslinked microgels is one the newest trends that is gaining momentum every year. This is due to the simplicity of the treatment process and its management, as well as the guaranteed effect in the case of the correct well candidate selection. We identified the following varieties of microgels: microspheres, thermo- and pH-responsible microgels, thin fracture of preformed particle gels, colloidal dispersed gels. In this publication, we try to combine the available chemical aspects of microgel production with the practical features of their application at oil production facilities. The purpose of this publication is to gather available information about microgels (synthesis method, monomers) and to explore world experience in microgel application for enhanced oil recovery. This article will be of great benefit to specialists engaged in polymer technologies at the initial stage of microgel development.

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Section: Methodsmentioning

confidence: 99%

Section: Microgels For Reservoir Conformance Controlmentioning

confidence: 99%

Review of Microgels for Enhanced Oil Recovery: Properties and Cases of Application

Ketova

Burin

Galkin

et al. 2022

Gels

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“…Bulk hydrogels are permeability blockers that plug pore spaces, preventing fluid movement. Their goal is to seal multiple connected fractures, microfractures, and the thief zones leading water to the producing interval from a nearby aquifer or when there is conification [76,77]. Bulk hydrogel systems can be applied for two main purposes.…”

Section: In-situ Bulk Hydrogelsmentioning

confidence: 99%

Water Control with Gels Based on Synthetic Polymers under Extreme Conditions in Oil Wells

et al. 2022

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A bibliographic review of research works dealing with gels based on synthetic polymers and their application in water control under harsh conditions was compiled. The extreme conditions were defined to be above 100 °C with 100 000 ppm of total dissolved solids, including divalent ions. Works describing laboratory experiments and oilfield implementations were also considered. According to current literature, some gels based on synthetic polymers have displayed desirable properties for water control, but in many cases, research is still at laboratory level. Therefore, further studies are required to understand the mode of action and stability of gels and polymers submitted to hard conditions in order to produce high‐performance prototypes.

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“…However, currently, most gel‐plugging agent is based on acrylamide polymers, which has poor thermal stability and are unlikely to have high structural strength after gelation. Moreover, polymer solution usually has high viscosity and is sensitive to shearing, which results in poor pumpability and the shearing during pumping may destroy the gelation process 24–26 …”

Section: Introductionmentioning

confidence: 99%

“…Moreover, polymer solution usually has high viscosity and is sensitive to shearing, which results in poor pumpability and the shearing during pumping may destroy the gelation process. [24][25][26] Water-based gels plugging agents play an important role in solving lost circulations, while these gels cannot gelatinize in oil-based drilling fluid, or even make its rheological properties worse. The existing oil-based gels have been broadly used in fracturing fluid and are mainly composed of phosphates as gelling agents, however, it is because it's low bearing capacity and poor thermal stability that it cannot be used as a plugging agent in high temperature fractured formations.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on an oil‐based polymer gel for lost circulation control in high‐temperature fractured formation

Qiu

Bai

Sun

et al. 2021

J of Applied Polymer Sci

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Aiming at the lack of plugging agent for oil‐based drilling fluid leakage in fractured formation, an oil‐based gel‐plugging agent with high structural strength and strong thermal stability was synthesized based on monomer polymerization and crosslinking. According to the preparation experiment, when the total concentration of methyl methacrylate (MMA) and butyl acrylate (BA) is 30% and the ratio is 6:4, the oil‐based gel solution can be completely gelatinized from 80 to 200°C, which has high gel strength and controllable gelation time. The effects of total concentration of BA and MMA, the ratio of BA and MMA, synthesis temperature, oil‐based drilling fluid invasion, shear effect, and fiber concentration on gelling performance were systematically studied. Fourier transform infrared molecular structure analysis showed that the oil‐based gel contained benzene ring group and ester characteristic group. From the rheological properties of oil‐based gel with 30% gelling agent at 160°C, it could be seen that the elastic modulus G′ of 10 Hz is 232 kPa, which is much larger than the storage modulus G″ is 99 kPa, which reflects the solid properties and has good elasticity and high strength. The displacement experiment of sand filling pipe and dynamic and static plugging experiment of high temperature and high pressure shows that the oil‐based gel has high bearing capacity in fractures and sand filling pipe. The bearing pressure is 3.01 MPa in 6 mm fractures, and the bearing pressure gradient is 0.602 MPa/cm.

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Progress of polymer gels for conformance control in oilfield

Cited by 86 publications

References 106 publications

Review of Microgels for Enhanced Oil Recovery: Properties and Cases of Application

Review of Microgels for Enhanced Oil Recovery: Properties and Cases of Application

Water Control with Gels Based on Synthetic Polymers under Extreme Conditions in Oil Wells

Experimental study on an oil‐based polymer gel for lost circulation control in high‐temperature fractured formation

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