以乳酸乙酯为主体研制一种温敏型泥饼清除剂（G315）,在此基础上配制温敏型酸性完井液（CF-G315）,通过岩心评价实验、泥饼溶蚀实验和腐蚀性实验,分析G315的泥饼清除性能、CF-G315的泥饼清除效率、CF-G315对井周储层的改造能力、对套管的腐蚀性及水解性能。研究表明：G315中的乳酸乙酯在常温下呈弱酸性,高温下分解出乳酸,与泥饼中的碳酸钙反应产生气泡剥离泥饼,生成可溶性盐随液体流出,泥饼清除功能良好。CF-G315在高效清除泥饼的同时,还可改善井周储层渗透性,同时具有低腐蚀性与环保性能,可有效保障设备安全,简化施工工艺,降低作业风险,在水平井、裸眼完井和砾石充填完井等场景中具有较好的应用潜力。
A temperature-sensitive mud cake remover (G315) was developed using ethyl lactate as the primary component. Based on this, a temperature-sensitive acidic completion fluid (CF-G315) was formulated. Core evaluation tests, mud cake dissolution tests and corrosion tests were conducted to analyze the mud cake removal performance of G315, and the removal efficiency of CF-G315, its ability to modify the near-wellbore reservoirs, corrosion to casing and hydrolysis performance. Results indicate that ethyl lactate in G315 exhibits weak acidity at room temperature and decomposes into lactic acid under high temperatures. The lactic acid reacts with the calcium carbonate in the mud cake, generating bubbles that dislodge the cake and form soluble salts that are subsequently removed by fluid flow, thereby ensuring effective mud cake clearance. CF-G315 removes mud cake efficiently and enhances near-wellbore reservoir permeability. It demonstrates low corrosivity and environmental compatibility, contributing to equipment safety, simplified operational procedures, and reduced operational risks. CF-G315 is promising for application in scenarios such as horizontal wells, open-hole completions, and gravel pack completions.
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