天然气井化学解堵技术与讨论
Chemical Plugging Removal Technology and Discussion of Natural Gas Wells
王源1
作者信息
- 1. 中国石油集团长城钻探工程有限公司苏里格气田分公司,辽宁盘锦 124010
- 折叠
摘要
由于天然气井结垢沉积造成井筒堵塞影响开采效果,研究了一种新型低腐蚀性、高阻垢性能的复合防垢剂.进行结垢表征、卤水成分分析、流体配伍性和稳定性分析、溶解性测试、沉淀溶解平衡、腐蚀测试和岩心驱替等一系列综合实验研究.结垢样品包括碳酸钙和硫酸盐垢.结果表明,在70℃条件下,6 h后2种样品的溶出率均大于74％,而在100℃条件下,5 h后2种样品完全溶解.新型防垢剂的pH为9,在6.9 MPa、100℃下6 h的低腐蚀速率为0.063 kg·m-2.此外,岩心驱替测试表明,使用新型防垢剂可以将岩心渗透率从最初的0.67 mD提高到1.29 mD,新型防垢剂可以明显提高岩心渗透率,可用于天然气井化学解堵.
Abstract
As natural gas well scaling deposition causes wellbore blockage affecting the extraction effect, a new type of composite anti-scaling agent with low corrosivity and high scale inhibition performance was investigated. A series of comprehensive experimental studies such as scale characterization, brine composition analysis, fluid compatibility and stability, solubility test, precipitation dissolution equilibrium, corrosion test and core drive were carried out. The scaling samples included calcium carbonate and sulfate scales. The results showed that the dissolution rate of both samples was greater than 74％ after 6 h at 70 ℃, while both samples were completely dissolved after 5 h at 100 ℃. The pH value of the novel antiscalant was 9, and the low corrosion rate was 0.063 kg∙m-2 after 6 h at 6.9 MPa and 100 ℃. In addition, the core replacement test showed that the core permeability could be increased from the initial 0.67 mD to 1.29 mD by using the novel antiscalant, and that the novel antiscalant could significantly increase the core permeability and could be used for the chemical plugging removal of natural gas wells.
关键词
化学解堵/防垢剂/表征/岩心驱替/天然气/结垢Key words
Chemical plugging removal/Anti-scaling agent/Characterization/Core replacement/Natural gas/Fouling引用本文复制引用
基金项目
黑龙江省自然科学面上基金项目(2023NSFSC0192)
出版年
2024
NETL
NSTL
万方数据