ArticleACS omega2026
Composite Plug-Removal Technology for Polymer Profile Control Wells in Sandstone Reservoirs.
Article in ACS omega, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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5 authors.
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Abstract
To address the problems of high injection pressure, unclear plugging mechanisms, and poor performance of conventional stimulation and plugging-removal measures in polymer-containing profile-control wells of the Sha-3 reservoir in the Liuzan North Block, the plugging mechanism was investigated by X-ray diffraction, scanning electron microscopy (SEM), and core flooding experiments. The results show that the plugging materials are composite plugging materials formed by the interaction of retained profile-control polymers in the reservoir with heavy components and clay minerals. These plugging materials are characterized by stable structures and complex compositions. Based on the characteristics of the plugging materials, a composite plug-removal agent system was optimized, and the corresponding treatment parameters were determined. The optimized plugging-removal system was composed of 0.5 wt % surfactant as an oil-washing agent, mud acid (12 wt % HCl + 2 wt % HF) as an inorganic dissolution agent, and 5 wt % JD-Y as a polymer degradation agent. This system exhibited high dissolution efficiency for different types of plugging components. After the addition of functional additives, including 1.0 wt % HS-3 corrosion inhibitor, 1.5 wt % EG-13 iron ion stabilizer, and 2.0 wt % LA5 clay stabilizer, the corrosion rate of the acid system decreased to 3.16 g·m
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