Study of adhesive self-degrading gel for wellbore sealing

Wang, Ying; Liu, Deji; Liao, Ruiquan; Zhang, Guangming; Zhang, Manlai; Li, Xiaohui

doi:10.1016/j.colsurfa.2022.129567

Cited by 16 publications

(6 citation statements)

References 15 publications

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“…When the gel loses moisture, the CK branched chains cannot support the three-dimensional network structure of the gel. Therefore, the mechanical properties of the gel are mainly supported by the internal water, low strength, and high flexibility so that the gel has a certain degree of withstand the bottomhole pressure at the same time has better degradation properties, it is well-known that the higher the strength of the gel degradation is more difficult, which is explained in detail in our previous study …”

Section: Resultsmentioning

confidence: 98%

“…Therefore, the mechanical properties of the gel are mainly supported by the internal water, low strength, and high flexibility so that the gel has a certain degree of withstand the bottomhole pressure at the same time has better degradation properties, it is wellknown that the higher the strength of the gel degradation is more difficult, which is explained in detail in our previous study. 36 Thermogravimetry−Mass Spectrometry. The degradation properties of SDG were investigated by using the TG-MS method.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Prediction of Hydrogel Degradation Time Based on Central Composite Design

Wang,

Liu,

Liao

et al. 2023

ACS Omega

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In this study, a self-degrading hydrogel was formed by free-radical-initiated copolymerization, which can be used for oil and gas well strip pressure operations. Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (1H NMR), scanning electron microscopy (SEM), and thermogravimetry–mass spectrometry (TGA-MS) were used to study the reaction mechanism as well as the microstructure of the gels. Then, the effects of the four factors and their interactions on gel degradation time were determined by central composite design (CCD). Then, the effects of copolymer concentration, cross-linker, initiator, and reaction temperature and their interactions on gel degradation time were determined by central composite design (CCD), and the corresponding second-order polynomial models were generated. Finally, the gelation conditions were optimized by a response surface methodology and verified by degradation experiments. Both FTIR and 1H NMR indicated that the gel was formed by a copolymerization reaction between the monomer and the cross-linker. SEM showed that the gel structure collapsed, which was caused by the poor mechanical properties of the gel, but it was also able to withstand some wellbore pressure and degraded more easily. TGA–MS showed that the gel possessed good degradation properties. In addition, analysis of variance (ANOVA) showed that the second-order polynomial model was highly significant. The results also showed that the expected values of the gelation conditions optimized by the response surface methodology did not differ significantly from the actual values. The degradation model can be used to predict the degradation time of the gel and optimization of gelation conditions. This study can help petroleum engineers in applying self-degrading gels to seal the wellbore pressure.

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Section: Resultsmentioning

confidence: 98%

Section: ■ Results and Discussionmentioning

confidence: 99%

Prediction of Hydrogel Degradation Time Based on Central Composite Design

Wang,

Liu,

Liao

et al. 2023

ACS Omega

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“…The unstable main agent can be chosen to make the gel degrade naturally at a certain temperature. Wang et al 170 synthesized highly viscous and self-degrading gels using AM, acrylic acid (AAm), and unstable cross-linker (SEG). The degradation mechanism is shown in Figure 16; the increase of SEG brings a large number of ester groups, the degradation of the gel is mainly caused by the hydrolysis of ester groups, and the degradation time is about 75−310 h at 60−100 °C.…”

Section: Oxidation Breakingmentioning

confidence: 99%

Section: Improved Gel Performancementioning

confidence: 99%

Progress and Prospects of In Situ Polymer Gels for Sealing Operation in Wellbore and Near-Well Zone

Kang,

Liu,

Jia

et al. 2024

Energy Fuels

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In situ polymer gels have been received as a useful tool for sealing operations such as fluid loss control during well drilling and workover and completion, well stimulation, water shutoff, wellbore integrity, and wellbore pressure management. With the development of deep-sea, deep-earth, and unconventional reservoirs, various harsh conditions such as high temperature, high pressure, and complex working conditions pose great challenges to the performance of gels. This paper first summarizes the application and operating mechanism of in situ polymer gels for sealing operations in wellbore and near-wellbore zones. Then, the in situ polymer gels are categorized into three types, in situ monomer gels, in situ cross-linked gels, and in situ generated foam gels, and the advantages and disadvantages of these three types of gels are introduced. Second, an overview of performance improvement methods for in situ polymer gels is highlighted, including improved temperature resistance and strength, accelerated gelation, retarded gelation, gel-breaking methods, and self-degradation systems. Finally, the challenges and prospects of in situ polymer gels for sealing operation in wellbores and near-well zones are presented, to provide references for the application, formulation, and performance improvement of in situ polymer gels.

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“…ZDDA can be completely degraded in a 3−20% HCl solution, but the plugging strength of this system in the core is weaker than that of the DPPG, only 7.8 MPa. Wang et al 35 used the unstable crosslinker SEG (i.e., neopentyl glycol diacrylate, NGD) as a crosslinker. Then, he conducted free-radical synthesis with monomers such as AM and acrylic acid to obtain highly adhesive self-degrading gels.…”

Section: Introductionmentioning

confidence: 99%

Effect of Crosslinker Types on Temporary Plugging Performance of Degradable Preformed Particle Gels for Unconventional Petroleum Reservoir Development

Zhu

Gong

Wang³

et al. 2022

Energy Fuels

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Temporary plugging agents (TPAs) have been widely used in unconventional petroleum reservoirs to increase the stimulated reservoir volume and generate an easier flow of oil and gas into the production well. The properties of particle-gel-based TPAs include a straightforward injection procedure, excellent deformation, strong plugging strength, and total self-degradation. This study prepared degradable preformed particle gel (DPPG) samples polymerized by two types of crosslinkers (i.e., alcohol ester and alkenoic acid ester) for low-temperature (less than 40 °C) reservoirs. The effects of different crosslinkers in the DPPG compositions on the temporary plugging performance were investigated. Infrared spectrum analysis, differential calorimetry scanning evaluation, static particle gel swelling and degradation performance assessment experiments, and dynamic temporary plugging performance tests were all employed. The results showed that the swelling ratio of DPPGs prepared by the crosslinker containing alcohol ester was larger than that of alkenoate acid ester, but the degradation rate was slower. Among them, when the amount of crosslinker was 0.01 g, the swelling ratio of DPPG prepared using the alcohol ester crosslinker was as high as 40 times, and the complete degradation time could be regulated between 80 and 360 h. When the type of crosslinker was the same, the influence of its molecular weight also significantly affected the performance of the particle gel. The plugging strength of DPPG prepared by different crosslinkers in cores was as high as 20 MPa. The DPPG prepared from the alcohol ester crosslinker caused less damage to the core after being self-degraded and was used as an ideal crosslinker. Infrared spectroscopy and differential scanning calorimetry analysis at the molecular level verified that different types of crosslinkers had apparent effects on the chemical structure stability of the DPPG. In this paper, the influence of the type of crosslinker on the performance of the DPPG was studied, which provides a new idea and theoretical basis for developing a particle gel-based TPA system with programmed self-degradation time at low temperatures.

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Study of adhesive self-degrading gel for wellbore sealing

Cited by 16 publications

References 15 publications

Prediction of Hydrogel Degradation Time Based on Central Composite Design

Prediction of Hydrogel Degradation Time Based on Central Composite Design

Progress and Prospects of In Situ Polymer Gels for Sealing Operation in Wellbore and Near-Well Zone

Effect of Crosslinker Types on Temporary Plugging Performance of Degradable Preformed Particle Gels for Unconventional Petroleum Reservoir Development

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