表面技术2017，Vol.46Issue(7)：168-172,5.DOI:10.16490/j.cnki.issn.1001-3660.2017.07.028
渤海油田典型井套管损坏原因分析
Analysis of Casing Damage on Typical Wells in Bohai Oilfield
摘要
Abstract
The work aims to lay a foundation for prevention and control of casing damage wells by finding out causes of well casing damage in Bohai Oilfield. According to the detected 32 casing damage wells and relevant data collection, statistics was analyzed in respect of block distribution, damage vertical distribution, production period and damage type. Corresponding rule was found out based upon the statistical results. Causes and mechanisms of casing damage accidents were explored in re-spect of stratum conditions, corrosion conditions and cavitation corrosion near casing damage points, and corresponding preven-tion measures were proposed to improve service life of the wells. It was concluded that casing damage wells were mainly present in some old oilfields, and casing damage points were mostly in well section within the depth of 2000 m. The damage points were located in bottom water layer of the Minghuazhen Formation and near inlet of annulus injection well. Corrosion was the main cause of casing damage in the Bohai Oilfield. Injection fluid and external formation water were main mediums of cor-rosion. Long-term high-speed fluid erosion, abrupt change of casing flow velocity and casing without cement ring would acce-lerate the degree of casing damage. In order to prevent casing damage of new wells, it is suggested that the wells at the bottom of the Minghuazhen Formation shall be completely sealed during well cementation to prevent direct contact between the casing and formation water from weakening corrosion effect. For new injection wells, it is suggested to improve quality standard of in-jection water, reduce injection volume and increase over-flow area of the inlet, avoid annulus injection mode and minimize long-term exposure of injection fluid to casing.关键词
渤海油田/套管表面损伤/套损原因/套损类型/空化作用/腐蚀预防Key words
Bohai Oilfield/casing surface damage/casing damage cause/casing damage type/cavitation effect/corrosion prevention分类
矿业与冶金引用本文复制引用
徐刚,刘鹏,张启龙,陈毅,陈彬..渤海油田典型井套管损坏原因分析[J].表面技术,2017,46(7):168-172,5.基金项目
"十三五"国家科技重大专项(2016ZX05058)Supported by the Scientific Research of the "13th five-year" national science and technology major (2016ZX05058) （2016ZX05058）
