Experimental study of degradable preformed particle gel (DPPG) as temporary plugging agent for carbonate reservoir matrix acidizing to improve oil recovery

Zhao, Shuda; Zhu, Daoyi; Bai, Baojun

doi:10.1016/j.petrol.2021.108760

Cited by 47 publications

(16 citation statements)

References 19 publications

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“…PPGs based on 2-acrylamido-2-methyl-1-propanesulfonate (AMPS) and poly(ethylene glycol)diacrylate were synthesized with the purpose of being stable in an acid medium and selfdegrading little by little into a low-viscosity solution without causing reservoir damage. Often, gels placed in wells after the acid cleaning process degrade forming residues that damage the formation, but in this case, this type of PPGs can be used as temporary plugging agents in acidizing operations [63].…”

Section: Ppgsmentioning

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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Section: Ppgsmentioning

confidence: 99%

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

et al. 2022

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“…For example, the chemically degradable gels may be used in applications including zonal isolation in enhanced oil recovery (EOR), loss circulation, wellbore strengthening treatments, and reservoir application such as in controlling the permeability of the formation, etc. − Moreover, a self-degradable thermal gel has been manufactured by introducing a thermally degradable crosslinking structure such as polyethylene glycol diacrylate (PEGDA) into a conventional gel for flexible application and preventing damage to the reservoir. Meanwhile, this kind of gel is not suitable for use in the wellbore because its degradation process relies on the decomposition of ester bonds and an acid is produced in this process, which greatly affects the gel’s adhesive ability to the wall of the well, resulting in poor pressure performance. − …”

Section: Introductionmentioning

confidence: 99%

Development of a High-Strength and Adhesive Polyacrylamide Gel for Well Plugging

Cheng

Qin

Su³

et al. 2022

ACS Omega

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Addition of melamine formaldehyde (MF) as a crosslinker containing hydroxymethyl to partially hydrolyzed poly(acrylamide) (HPAM) generated covalently crosslinked in situ gels through chemically nucleophilic attack by hydroxymethyl groups to amide in an HPAM backbone, which was demonstrated by FTIR spectrum analysis and rheological studies. NH4Cl could act as a catalyst to reduce the gelation time from 7 days in dilute water to 8 h in the presence of 0.8 wt % NH4Cl. Compared to high-temperature HPAM/phenol/formaldehyde and HPAM/Cr3+ gel systems, this gel has better adhesion and higher strength over a broad range of temperature from 60 to 100 °C under reservoir conditions with a denser and hook-like three-dimensional microstructure. Pressure-bearing capacity experiments demonstrated that the gel could efficiently plug high pressure from underneath to seal the wellbore, attributing to its high strength and good adhesion. This study could aid petroleum engineers in applying soft materials on controlling the pressure via polymer gels.

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“…To reduce excessive water production and to improve sweep efficiency, many technologies, including polymer flooding and foam flooding, have been widely applied over the past several decades [ 1 ]. One of the most popular treatment methods is to inject gels to reduce the flow capacity of channels or fractures and divert the following fluid (i.e., water) to un-swept oil zones [ 2 , 3 , 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

A Novel Numerical Model of Gelant Inaccessible Pore Volume for In Situ Gel Treatment

Leng

Sun

Wei

et al. 2022

Gels

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Inaccessible pore volume (IAPV) can have an important impact on the placement of gelant during in situ gel treatment for conformance control. Previously, IAPV was considered to be a constant factor in simulators, yet it lacked dynamic characterization. This paper proposes a numerical simulation model of IAPV. The model was derived based on the theoretical hydrodynamic model of gelant molecules. The model considers both static features, such as gelant and formation properties, and dynamic features, such as gelant rheology and retention. To validate our model, we collected IAPV from 64 experiments and the results showed that our model fit moderately into these lab results, which proved the robustness of our model. The results of the sensitivity test showed that, considering rheology and retention, IAPV in the matrix dramatically increased when flow velocity and gelant concentration increased, but IAPV in the fracture maintained a low value. Finally, the results of the penetration degree showed that the high IAPV in the matrix greatly benefited gelant placement near the wellbore situation with a high flow velocity and gelant concentration. By considering dynamic features, this new numerical model can be applied in future integral reservoir simulators to better predict the gelant placement of in situ gel treatment for conformance control.

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Experimental study of degradable preformed particle gel (DPPG) as temporary plugging agent for carbonate reservoir matrix acidizing to improve oil recovery

Cited by 47 publications

References 19 publications

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

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

Development of a High-Strength and Adhesive Polyacrylamide Gel for Well Plugging

A Novel Numerical Model of Gelant Inaccessible Pore Volume for In Situ Gel Treatment

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