Synergistic Effect of Oxidation Dissolution and Acid Fracturing in Improving Shale Gas Production Capacity

IF 0.6 4区 工程技术 Q4 ENERGY & FUELS Chemistry and Technology of Fuels and Oils Pub Date : 2024-05-13 DOI:10.1007/s10553-024-01688-9
Yongjun Xiao, Wenhan Yue, Chunlin Wu, Zhi Chen, Bingxiao Liu, Ran Wen
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Abstract

Shale gas is an extremely important unconventional oil and gas resource, and its efficient development can effectively alleviate the current tense energy situation. However, shale gas reservoirs often have extremely poor permeability, and reservoir transformation has become a key technology for achieving their efficient development. However, the commonly used hydraulic fracturing technology is difficult to achieve its target production capacity, and other engineering technologies related to reservoir transformation urgently need to be proposed and attempted. The synergistic operation of oxidation dissolution and acid fracturing may provide new ideas for the effective transformation of shale reservoirs. To this end, a comparative analysis was conducted on the synergistic effects of oxidation dissolution and acid fracturing operations in improving shale gas production capacity. The research results indicate that the dissolution effect of oxidants is more effective than acid solution in the transformation process of shale reservoirs. The use of acid only widens the crack width from the initial 4.4 mm to the final 5.1 mm. However, the use of oxidants will result in the final width of hydraulic fractures reaching 8.3 mm. Meanwhile, the effects of acid concentration and oxidant concentration on hydraulic fracture conductivity and shale gas production capacity were investigated. The results indicate that increasing the acid concentration below the low concentration range can significantly enhance the fracture conductivity, thereby promoting the production capacity of shale gas. However, within a higher concentration range, its effect on shale gas production is significantly limited. It is recommended to set the acid concentration design value at 0.5 wt% during the acidizing and fracturing reservoir transformation process of the shale gas reservoir in Changning block. In addition, an increase in the concentration of oxidants can widen the width of fractures and increase permeability, thereby promoting the migration and extraction of shale gas. To avoid the increase in development costs caused by high oxidant concentration in the working fluid, it is recommended to design the oxidant concentration at 3 wt%.

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氧化溶解与酸性压裂在提高页岩气产能方面的协同效应
页岩气是一种极其重要的非常规油气资源,对其进行高效开发可以有效缓解当前紧张的能源形势。然而,页岩气储层的渗透性往往极差,储层改造已成为实现其高效开发的关键技术。然而,常用的水力压裂技术很难达到目标产能,其他与储层改造相关的工程技术亟待提出和尝试。氧化溶解与酸性压裂的协同作业可能为页岩储层的有效改造提供新思路。为此,研究人员对氧化溶解和酸性压裂作业在提高页岩气产能方面的协同效应进行了对比分析。研究结果表明,在页岩储层的改造过程中,氧化剂的溶解作用比酸性溶液更有效。使用酸液只能将裂缝宽度从最初的 4.4 毫米扩大到最终的 5.1 毫米。而使用氧化剂则会使水力裂缝的最终宽度达到 8.3 毫米。同时,研究了酸浓度和氧化剂浓度对水力压裂传导性和页岩气产能的影响。结果表明,在低浓度范围以下增加酸浓度可显著提高压裂传导性,从而提高页岩气的产能。但在较高浓度范围内,其对页岩气产量的影响明显有限。建议在长宁区块页岩气藏酸化压裂储层改造过程中,将酸浓度设计值设定为 0.5 wt%。此外,氧化剂浓度的增加可以拓宽裂缝宽度,提高渗透率,从而促进页岩气的迁移和开采。为避免工作液中氧化剂浓度过高导致开发成本增加,建议将氧化剂浓度设计为 3 wt%。
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来源期刊
Chemistry and Technology of Fuels and Oils
Chemistry and Technology of Fuels and Oils 工程技术-工程:化工
CiteScore
0.90
自引率
16.70%
发文量
119
审稿时长
1.0 months
期刊介绍: Chemistry and Technology of Fuels and Oils publishes reports on improvements in the processing of petroleum and natural gas and cracking and refining techniques for the production of high-quality fuels, oils, greases, specialty fluids, additives and synthetics. The journal includes timely articles on the demulsification, desalting, and desulfurizing of crude oil; new flow plans for refineries; platforming, isomerization, catalytic reforming, and alkylation processes for obtaining aromatic hydrocarbons and high-octane gasoline; methods of producing ethylene, acetylene, benzene, acids, alcohols, esters, and other compounds from petroleum, as well as hydrogen from natural gas and liquid products.
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