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Investigating the Compatibility of Enzyme with Chelating Agents for Calcium Carbonate Filter Cake Removal

机译:研究酶与螯合剂的兼容性,以去除碳酸钙滤饼

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摘要

Removal of water-based filter cake formed during drilling and hydraulic fracturing operations is a difficult task. Conventional acids, such as hydrochloric acid, organic acid, or a mixture of these acids, can be used to remove the filter cake. The common issues of these acids are rapid and uncontrolled reaction rate and corrosion to well tubulars, especially in horizontal and deep wells. Chelating agents were introduced in the oil industry to solve the problems associated with the conventional acids. Up to the authors' knowledge, the reaction of chelating agents with starch, which is a major component of the filter cake, was not investigated in the literature. The objectives of this study are to (1) assess the reaction of starch with different chelating agents, namely ethylenediaminetetraacetic acid (EDTA), glutamic acid diacetic acid (GLDA), and diethylene triamine penta-acetic acid (DTPA), at different conditions of pH and temperature, (2) evaluate the compatibility of chelating agents with enzyme [high thermally stable -amylase enzymes (HTA)], (3) assess the reaction of enzyme with starch and xanthan gum, and (4) design the best scenario for calcium carbonate filter cake removal. The obtained results showed that EDTA (20 wt%, pH 7, and 12), DTPA (20 wt%, pH 7, and 12), and GLDA (20 wt%, pH 4, 7, and 12) were not able to break the starch after hot rolling for different time periods at . Different chelating agents were found to be incompatible with -amylase enzyme (HTA enzyme that should be used to remove the starch). The two-stage scenario was found to be the best practice to remove the calcium carbonate filter cake in 22 h with 100% removal efficiency and 100% retained permeability. Computer tomography confirmed that external and internal filter cake was completely removed, and no formation damage was existing.
机译:去除在钻井和水力压裂操作中形成的水​​基滤饼是一项艰巨的任务。可以使用常规酸,例如盐酸,有机酸或这些酸的混合物来去除滤饼。这些酸的常见问题是反应速率过快且不受控制,并且会腐蚀管井,特别是在水平井和深井中。螯合剂被引入石油工业以解决与常规酸有关的问题。据作者所知,文献中没有研究螯合剂与淀粉的反应,淀粉是滤饼的主要成分。这项研究的目的是(1)在不同的条件下评估淀粉与不同的螯合剂,即乙二胺四乙酸(EDTA),谷氨酸二乙酸(GLDA)和二亚乙基三胺五乙酸(DTPA)的反应。 pH和温度,(2)评估螯合剂与酶的相容性[高热稳定淀粉酶(HTA)],(3)评估酶与淀粉和黄原胶的反应,(4)设计最佳方案去除碳酸钙滤饼。获得的结果表明EDTA(20 wt%,pH 7和12),DTPA(20 wt%,pH 7和12)和GLDA(20 wt%,pH 4,7和12)不能在25℃的不同时间内热轧后破碎淀粉。发现不同的螯合剂与-淀粉酶(应用于去除淀粉的HTA酶)不相容。发现两阶段方案是在22小时内以100%的去除效率和100%的保留渗透率去除碳酸钙滤饼的最佳实践。计算机断层扫描证实,内部和外部的滤饼已完全清除,并且没有地层损坏。

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