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Effect of Treatment Conditions on Matrix Stimulation of Carbonate Rocks with Chelating Agents
Arabian Journal for Science and Engineering ( IF 2.9 ) Pub Date : 2021-04-12 , DOI: 10.1007/s13369-021-05633-4
Assad A. Barri , Amjed M. Hassan , Murtada Saleh Aljawad , Mohamed Mahmoud

This study aimed to optimize the acidizing efficiency during stimulation treatments with chelating agents. The performance of hydroxylethylethylenediaminetriacetic acid (HEDTA), diethylenetriaminepentaacetic acid (DTPA), and ethylenediaminetetraacetic acid (EDTA) in stimulating carbonate rocks were investigated. In this paper, the effect of injection rate, chemical type, pH, and concentration on the stimulation performance was studied. Also, the optimum treatment conditions were identified utilizing the acid volume and treatment time. Different measurements were carried out, including solubility tests, coreflooding experiments, and CT scan analysis. Solubility tests were performed to study the impact of solution concentration and pH on the performance of the chelating agent. Coreflooding experiments were carried out at high-pressure, high-temperature conditions to assess the performance of chelating agents in different treatment situations. In addition, CT scan analysis was carried out before and after the acid injections to capture the changes induced in the carbonate matrix due to the stimulation treatment. The success of acidizing treatment was identified by the creation of the dominant wormholes. The pressure-drop profiles and the CT scan analysis were used to confirm the generation of wormholes. Finally, the normalized volume and time to breakthrough were utilized to identify the optimum treatment conditions. In this work, chelating agents successfully created dominant wormholes (WHs) in carbonate rocks at different injection rates and treatment conditions. However, applying an injection rate between 0.7 and 1 cm3/min significantly improved the acidizing performance and reduced the acid volume that was required to create wormholes. EDTA and HEDTA chelating agents showed better performance at low pH. Using a solution pH of 4.5 resulted in reducing the acid volume by 30% compared to using a solution pH of 10 at the same conditions. However, DTPA chelating agent showed better performance at high pH, and dominant WHs were created at a pH of 12 using less acid volume. Finally, the optimum acidizing treatment can be achieved by using EDTA chelating agent with a concentration of 9.25 wt.% and pH of 4.5. Applying the optimum treatment parameters can reduce the acid volume by 40% and the chemical cost by a factor of 6, on average. Overall, this study indicates that chelating agents’ solution can be injected at optimum conditions in terms of chemical concentration, pH, and injection rate, to maximize the treatment efficiency and reduce the cost.



中文翻译:

处理条件对螯合剂激发碳酸盐岩基质的影响

这项研究旨在优化螯合剂刺激治疗期间的酸化效率。研究了羟乙基乙二胺三乙酸(HEDTA),二乙三胺五乙酸(DTPA)和乙二胺四乙酸(EDTA)在刺激碳酸盐岩中的性能。本文研究了注入速率,化学类型,pH和浓度对刺激性能的影响。此外,利用酸量和处理时间确定了最佳处理条件。进行了不同的测量,包括溶解度测试,岩心驱替实验和CT扫描分析。进行了溶解度测试,以研究溶液浓度和pH对螯合剂性能的影响。在高压下进行岩心驱油实验,高温条件下评估螯合剂在不同治疗情况下的性能。另外,在酸注入之前和之后进行CT扫描分析,以捕获由于增产处理而在碳酸盐基质中引起的变化。酸化处理的成功是由主要的虫洞的产生来确定的。压降曲线和CT扫描分析被用来确认虫孔的产生。最后,利用标准化的体积和突破时间来确定最佳治疗条件。在这项工作中,螯合剂在不同的注入速率和处理条件下成功地在碳酸盐岩中形成了主要的虫洞(WH)。但是,注入速度应介于0.7到1厘米之间 在酸注入之前和之后进行CT扫描分析,以捕获由于增产处理而在碳酸盐基质中引起的变化。酸化处理的成功是由主要的虫洞的产生来确定的。压降曲线和CT扫描分析被用来确认虫孔的产生。最后,利用标准化的体积和突破时间来确定最佳治疗条件。在这项工作中,螯合剂在不同的注入速率和处理条件下成功地在碳酸盐岩中形成了主要的虫洞(WH)。但是,注射速度应介于0.7到1厘米之间 在酸注入之前和之后进行CT扫描分析,以捕获由于增产处理而在碳酸盐基质中引起的变化。酸化处理的成功是由主要的虫洞的产生来确定的。压降曲线和CT扫描分析被用来确认虫孔的产生。最后,利用标准化的体积和突破时间来确定最佳治疗条件。在这项工作中,螯合剂在不同的注入速率和处理条件下成功地在碳酸盐岩中形成了主要的虫洞(WH)。但是,注射速度应介于0.7到1厘米之间 酸化处理的成功是由主要的虫洞的产生来确定的。压降曲线和CT扫描分析被用来确认虫孔的产生。最后,利用标准化的体积和突破时间来确定最佳治疗条件。在这项工作中,螯合剂在不同的注入速率和处理条件下成功地在碳酸盐岩中形成了主要的虫洞(WH)。但是,注入速度应介于0.7到1厘米之间 酸化处理的成功是由主要的虫洞的产生来确定的。压降曲线和CT扫描分析被用来确认虫孔的产生。最后,利用标准化的体积和突破时间来确定最佳治疗条件。在这项工作中,螯合剂在不同的注入速率和处理条件下成功地在碳酸盐岩中形成了主要的虫洞(WH)。但是,注射速度应介于0.7到1厘米之间 螯合剂在不同的注入速率和处理条件下成功地在碳酸盐岩中形成了主要的虫洞(WH)。但是,注射速度应介于0.7到1厘米之间 螯合剂在不同的注入速率和处理条件下成功地在碳酸盐岩中形成了主要的虫洞(WH)。但是,注射速度应介于0.7到1厘米之间3/ min显着提高了酸化性能并减少了产生虫洞所需的酸量。EDTA和HEDTA螯合剂在低pH下表现出更好的性能。与在相同条件下使用pH值为10的溶液相比,使用pH值为4.5的溶液会使酸量减少30%。但是,DTPA螯合剂在高pH值下表现出更好的性能,并且在12 pH值下使用较少的酸体积会生成主要的WH。最后,通过使用浓度为9.25重量%且pH为4.5的EDTA螯合剂可以实现最佳的酸化处理。应用最佳处理参数可以平均减少40%的酸量和6倍的化学成本。总体而言,这项研究表明,就化学浓度而言,可以在最佳条件下注入螯合剂溶液,

更新日期:2021-04-12
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