Research on a temporary plugging agent based on polymer gel for reservoir acidification

Zhao, Guang; Dai, Caili; Li, Weitao; Yan, Zhihu; Zhao, Mingwei

doi:10.1007/s13202-015-0206-6

Cited by 19 publications

(6 citation statements)

References 16 publications

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“…After years of development, there are many types of temporary plugging agents, mainly divided into the following four types. They are granular TPA (Liu et al 2020;Shi et al 2020), fiber-type TPA (Zhang et al 2019b, c), gel-type TPA (Nasiri et al 2018;Zhao et al 2016), and compound TPA (Li et al 2020;Liu et al 2020).…”

Section: Edited By Yan-hua Sunmentioning

confidence: 99%

Development of degradable pre-formed particle gel (DPPG) as temporary plugging agent for petroleum drilling and production

et al. 2020

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Temporary plugging agent (TPA) is widely used in many fields of petroleum reservoir drilling and production, such as temporary plugging while drilling and petroleum well stimulation by diverting in acidizing or fracturing operations. The commonly used TPA mainly includes hard particles, fibers, gels, and composite systems. However, current particles have many limitations in applications, such as insufficient plugging strength and slow degradation rate. In this paper, a degradable pre-formed particle gel (DPPG) was developed. Experimental results show that the DPPG has an excellent static swelling effect and self-degradation performance. With a decrease in the concentration of total monomers or cross-linker, the swelling volume of the synthesized DPPG gradually increases. However, the entire self-degradation time gradually decreases. The increase in 2-acrylamide-2-methylpropanesulfonic acid (AMPS) in the DPPG composition can significantly increase its swelling ratio and shorten the self-degradation time. Moreover, DPPG has excellent high-temperature resistance (150 °C) and high-salinity resistance (200,000 mg/L NaCl). Core displacement results show that the DPPG has a perfect plugging effect in the porous media (the plugging pressure gradient was as high as 21.12 MPa), and the damage to the formation after degradation is incredibly minor. Therefore, the DPPG can be used as an up-and-coming TPA in oil fields.

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Section: Edited By Yan-hua Sunmentioning

confidence: 99%

Development of degradable pre-formed particle gel (DPPG) as temporary plugging agent for petroleum drilling and production

et al. 2020

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“…The thickened acid system has a certain viscosity and small friction, which can effectively control the acid–rock reaction rate. However, the insufficient temperature resistance of thickened acid limits its application in the acid fracturing of high-temperature wells [ 14 , 15 , 16 , 17 ]. After investigation, it was found that the temperature resistance of the existing thickened acid was basically below 140 °C [ 18 , 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Two-Level Self-Thickening Mechanism of a Novel Acid Thickener with a Hydrophobic-Associated Structure during High-Temperature Acidification Processes

Li,

Wang,

Lai

et al. 2024

Polymers

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Two acid thickeners, ADMC and ADOM, were prepared by aqueous solution polymerization using acrylamide (AM) and methacryloyloxyethyl trimethyl ammonium chloride (DMC) as raw materials, with or without the introduction of octadecyl polyoxyethylene ether methacrylate (OEMA). It was characterized by FTIR, 1H NMR, and the fluorescence spectra of pyrene. The double-layer thickening mechanism of ADOM was proved by comparing the thickening and rheological properties of ADMC and ADOM tested by a six-speed rotary viscometer and a HAKKE MARSIV rheometer during the acidification process. The results showed that the synthetic product was the target product; the first stage of the self-thickening ADOM fresh acid solution during high-temperature acidification was mainly affected by Ca2+ concentration, and the second stage of self-thickening was mainly affected by temperature. The residual viscosity of the 0.8 wt% ADOM residual acid solution was 250, 201.5, and 61.3 mPa·s, respectively, after shearing at 90, 120, and 150 °C for 60 min at a shear rate of 170 s−1. The thickening acid ADOM with a hydrophobic association structure has good temperature resistance and shear resistance, which can be used for high-temperature deep-well acid fracturing. In addition, no metal crosslinking agent was introduced in the system to avoid damage to its formation, and ADOM exhibited good resistance to Ca2+, which could provide ideas for the reinjection of the acidizing flowback fluid. It also has certain advantages for environmental protection.

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“…For the use of conventional polymer gel temporary plugging agents, the dosage of the crosslinking agent is crucial. A low crosslinking agent dosage leads to considerably low plugging strength, while a high dosage damages the formation. , …”

Section: Introductionmentioning

confidence: 99%

“…A low crosslinking agent dosage leads to considerably low plugging strength, while a high dosage damages the formation. 13,14 Different from the traditional temporary plugging agent, the supramolecular gel temporary plugging agent is based on the theory of supramolecular chemistry. It utilizes the temperature responsiveness of the thermally induced supramolecular gel to avoid the drawbacks of the conventional gel temporary plugging agent.…”

Section: Introductionmentioning

confidence: 99%

Temporary Plugging Agent System for Thermally Induced Phase Change Fracturing in Shale Gas Reservoirs

et al. 2022

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In this study, a temporary plugging agent composed of two different types of guest molecules for thermally induced phase change fracturing was constructed for different shale formation temperature ranges. This agent, which was constructed through the screening of the host, guest, and solvent, is in a uniform solution state at room temperature. The solution became cloudy with increasing temperature, and a stable gel was formed when the respective gelling temperature was reached. However, the gel turned into a solution again upon further heating. The temporary plugging agent system developed in this paper could realize the phase transition of “solution–gel–solution” only by changing the temperature. Characterization and evaluation of the basic performance of the temporary plugging agent show that the components of this agent form a long fibrous gel through supramolecular interactions, the constructed thermally induced phase change fracturing system has good thermal stability, and the filter loss is small. These findings indicate that the temporary plugging agent system for thermally induced phase change fracturing could form an excellent temporary plugging agent suitable for formations at 90–120 °C through the unique temperature responsiveness of supramolecular gels. In addition, the gel formation process was described by the host–guest structure combined with SEM characterization. The results of physical simulation experiments reveal that the temporary plugging agent has low viscosity, good fluidity, and good injectability at room temperature. After being injected into the formation, the temporary plugging agent could form a gel with sufficient strength at the target formation temperature to plug the fractures. After the formation was further heated, the formed gel gradually broke and caused slight damage to the core. The whole temporary plugging process does not require the addition of an additional crosslinking agent and a gel breaker. This new type of temporary plugging agent has a potential application value in shale gas refracturing.

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Research on a temporary plugging agent based on polymer gel for reservoir acidification

Cited by 19 publications

References 16 publications

Development of degradable pre-formed particle gel (DPPG) as temporary plugging agent for petroleum drilling and production

Development of degradable pre-formed particle gel (DPPG) as temporary plugging agent for petroleum drilling and production

Two-Level Self-Thickening Mechanism of a Novel Acid Thickener with a Hydrophobic-Associated Structure during High-Temperature Acidification Processes

Temporary Plugging Agent System for Thermally Induced Phase Change Fracturing in Shale Gas Reservoirs

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