Development of degradable pre-formed particle gel (DPPG) as temporary plugging agent for petroleum drilling and producti
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ORIGINAL PAPER
Development of degradable pre‑formed particle gel (DPPG) as temporary plugging agent for petroleum drilling and production Dao‑Yi Zhu1 · Xing‑Yu Fang1 · Ren‑Xian Sun1 · Zeng‑Hao Xu1 · Yang Liu1 · Ji‑Yang Liu1 Received: 19 August 2020 / Accepted: 9 November 2020 © The Author(s) 2020
Abstract 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. Keywords Temporary plugging agents · Pre-formed particle gel (PPG) · Degradable PPG · Petroleum drilling · Petroleum production
1 Introduction In recent years, temporary plugging technology has been widely used in various fields of petroleum reservoir drilling and production (Kang et al. 2014; Xiong et al. 2018; Zhang et al. 2019a). The design idea of temporary plugging technology is to use plugging agents (usually chemical agents) to plug the flow channels (i.e., layers with higher permeability) (Li et al. 2019; Liu et al. 2018). However, in the subsequent oil and gas production process, it is hoped that the agents sealing in the layers can be effectively removed or self-recovered (Zhang et al. 2020a). In this way, the oil and gas flow channels can be further increased or expanded, and more crude oil and natural gas can be produced. For Edited by Yan-Hua Sun * Dao‑Yi Zhu [email protected] 1
College of Petroleum, China University of Petroleum-Beijing at Karamay, Karamay 834000, Xinjiang, China
example, the use of temporary plugging technology during drilling can shield and protect oil and gas reservoirs during drilling. It can avoid damaging the permeability of the reservoir and ensure that oil and gas can flow easily to the wellbore and be produced. Besides, in the process of oil and gas reservoir devel
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