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.
XU Gang,LIU Peng,ZHANG Qi-long,CHEN Yi,CHEN Bin.Analysis of Casing Damage on Typical Wells in Bohai Oilfield[J].Surface Technology,2017,46(7):168-172 |
| 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 |
| 投稿时间：2017-01-30 修订日期：2017-07-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2017.07.028 |
| 中文关键词: 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 |
| 英文关键词:Bohai Oilfield casing surface damage casing damage cause casing damage type cavitation effect corrosion prevention |
| 基金项目:“十三五”国家科技重大专项（2016ZX05058） |
| 作者 | 单位 |
| 徐刚 | 中海石油（中国）有限公司天津分公司，天津 300459 |
| 刘鹏 | 中海石油（中国）有限公司天津分公司，天津 300459 |
| 张启龙 | 中海石油（中国）有限公司天津分公司，天津 300459 |
| 陈毅 | 中海石油（中国）有限公司天津分公司，天津 300459 |
| 陈彬 | 中海石油（中国）有限公司天津分公司，天津 300459 |
|
| Author | Institution |
| XU Gang | Tianjin Branch of CNOOC Co., Ltd, Tianjin 300459, China |
| LIU Peng | Tianjin Branch of CNOOC Co., Ltd, Tianjin 300459, China |
| ZHANG Qi-long | Tianjin Branch of CNOOC Co., Ltd, Tianjin 300459, China |
| CHEN Yi | Tianjin Branch of CNOOC Co., Ltd, Tianjin 300459, China |
| CHEN Bin | Tianjin Branch of CNOOC Co., Ltd, Tianjin 300459, China |
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| 中文摘要: |
| 目的 查明渤海油气田油井套损原因，为后期预防与治理套损井奠定基础。方法 对渤海油田32口套损井的套损情况进行检查和收集，从区块分布、套损纵向分布、生产年限、套损类型等方面进行统计。根据统计结果寻找相应规律，在套损点附近地层情况、冲蚀情况、空化腐蚀情况等方面，探究套损事故发生的原因和机理，并提出相应的预防措施，以提高井的使用年限。结果 渤海油田套损井主要发生在一些老油田，套损点多集中在2000 m以内井段，位置主要分布在明化镇组底部水层及环空注入井的吸入口附近。腐蚀是渤海油田套管损坏的主要原因，注入流体、管外地层水是腐蚀的主要介质。长期高速流体冲刷、套管内流速突然变化、套管外无水泥环都会加剧套损的程度。结论 为预防新井套损，建议固井时应彻底封固明化镇组底部存在水层的井段，避免套管与地层水直接接触，以减弱腐蚀作用。对于新的注入井，建议提高注入水水质标准，降低注入量，增大注入口过流面积，避免环空注入等方式，尽量减少注入流体与套管长期接触。 |
| 英文摘要: |
| 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 respect of stratum conditions, corrosion conditions and cavitation corrosion near casing damage points, and corresponding prevention 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 corrosion. Long-term high-speed fluid erosion, abrupt change of casing flow velocity and casing without cement ring would accelerate 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 injection 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. |
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