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大天池气田井下油管损伤分析
Damages of downhole tubing in Datianchi Gas Field
李海涛1 刘 畅1 黎洪珍2 张 健2
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DOI:
作者单位:1. 西南石油大学石油与天然气工程学院 2. 中国石油西南油气田公司重庆气矿
中文关键字:大天池气田 气井 油管 损伤 分析 对策
英文关键字:Datianchi Gas Field; Gas well; Tubing; Damage; Analysis; Countermeasure
中文摘要:为针对性地解决大天池气田井下油管在服役过程中的损伤问题,通过腐蚀检测、修井起出油管观察,对生产过程中
的油管损伤进行实时分析并提供对策。结果表明:①产出流体的强腐蚀性及流体中杂质极易导致油(套)管腐蚀,使其承压能力
不足,进而变形挤压油管,是生产中后期气井井下油管损伤的因素之一;②腐蚀过程中产生的垢物附着在油管内外壁,将产生持
续的垢下腐蚀,导致井下油管穿孔、断落。据此,提出4 条井下防护措施:①选取合适的油套管材质和油管结构,提高管串的抗
损伤能力;②尽量排完入井液,避免产生井下腐蚀条件;③合理配产,尽量降低冲蚀影响;④定期检测井下管串,及时调整防护
方案或更换油管。

DOI: 10.12055/gaskk.issn.1673-3177.2018.02.013


 

英文摘要:In order to prevent in-service downhole tubing from damages, the tubing damages in Datianchi Gas Field were analyzed by
detecting the corrosion and observing the tubing tripped out during workover. Results show that (1) for gas wells, during their middle
to late development stages, two factors leading to these damages are individually the strong corrosivity of produced fluid and the impurities
in fluids easily causing tubing/casing corrosion, which may deteriorate tubing/casing bearing capacity and consequently lead
to casing deformation enough to extrude the tubing; and (2) the scales generated from corrosion attaching to the inner and outer of
tubing walls, result in cortinuous subscale corrosion, and the downhole tubing is perforated and broken due to continuous corrosion.
In addition, four countermeasures against downhole damages are made, containing, to select suitable tubing and casing materials or
tubing structures to improve an anti-damage capacity of pipe strings, to drain the fluid as much as possible to avoid creating downhole
corrosion conditions, to arrange production proration rationally to minimize erosional impact, and to check downhole pipe strings regularly
and adjust protective schemes or replace tubing in time.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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