天然气井化学解堵技术与讨论  

Chemical Plugging Removal Technology and Discussion of Natural Gas Wells

作　　者：王源 WANG Yuan(Sulige Gasfield Branch of CNPC Greatwall Drilling Company,Panjin Liaoning 124010,China)

机构地区：[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

出　　处：《当代化工》2024年第5期1188-1192,共5页Contemporary Chemical Industry

基　　金：黑龙江省自然科学面上基金项目,大庆古龙页岩油渗流特征及动用机理(项目编号:2023NSFSC0192)。

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p H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。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 

分 类 号：TQ050.96[化学工程] TE358.5[石油与天然气工程—油气田开发工程]