天然气与石油2025，Vol.43Issue(6)：41-49,9.DOI:10.3969/j.issn.1006-5539.2025.06.006
盐穴储库小间距定向排卤井造腔技术方案及形态预测
Technical scheme and cavern shape prediction for cavern formation using small spacing directional brine drainage wells in salt cavern gas storage
摘要
Abstract
In China,most salt layers suitable for gas storage construction are characterized by low grade and high insoluble content(15%～50%).During solution mining,the massive deposition of insoluble substances leads to low cavern formation rates and reduced effective gas storage volume.To address this issue,a novel small-spacing directional well connection technology was proposed.This approach connects a directional well with a conventional vertical well at a small spacing,utilizing the directional well as a brine drainage well during both cavern formation and gas injection operations.This configuration significantly increases the effective dissolution area by expanding flow channels,enhances cavern formation rates,and enables brine drainage from sediment voids for gas storage,thereby expanding effective gas storage space.Based on key assumptions,including the flow field from the water injection port in the upper free space to the brine discharge port in the lower sediment voids,and the equivalence of the dissolution rate coefficient of sediment-covered walls to porosity,a dissolution-deposition mathematical model for simulating this small-spacing directional well connection technology was established for the first time.Corresponding cavern formation simulation software was developed using C++.Demonstration case comparisons reveal that the proposed solution achieves a 30%improvement in cavern formation efficiency compared to conventional single-well methods,a 15%increase in salt layer utilization through enhanced dissolution of sub-sediment salt layers,and a 63%expansion of effective gas storage volume by directly utilizing pore spaces within sediment deposits.Compared to traditional single-well single-cavern approaches,this small-spacing directional well technology significantly reduces unit working gas investment costs with only marginal additional capital expenditure.The research findings can provide new ideas and technical guidance for the construction of salt cavern gas storage facilities in salt layers with high insoluble content.关键词
低品位盐层/盐穴储气库/高效造腔/造腔模拟Key words
Low-grade salt layer/Salt cavern gas storage/Efficient cavern formation/Cavern formation simulation引用本文复制引用
刘继芹,王静,王文权,黄楠,马涛,施锡林,马洪岭,李金龙..盐穴储库小间距定向排卤井造腔技术方案及形态预测[J].天然气与石油,2025,43(6):41-49,9.基金项目
国家管网集团重大科技专项"地下空间高效利用关键技术研究与应用"子课题"深层盐穴储气库建库关键技术研究"(SJSG202304) （SJSG202304）
