川西地区须家河组气藏井下油管CO2腐蚀研究
Study on CO2 Corrosion of Tubing in Xujiahe Gas Reservoirs of Western Sichuan Areas
浏览(1405) 下载(5)
- 引用格式:
-
袁和义,江蕊希,黄炜伦,刘钰豪,李旭成.川西地区须家河组气藏井下油管CO2腐蚀研究[J].天然气与石油,2018,36(2):0.doi:
Yuan Heyi, Jiang Ruixi, Huang Weilun, Liu Yuhao, Li Xuchen.Study on CO2 Corrosion of Tubing in Xujiahe Gas Reservoirs of Western Sichuan Areas[J].Natural Gas and Oil,2018,36(2):0.doi:
- DOI:
- 作者:
- 袁和义1 江蕊希1 黄炜伦1 刘钰豪2 李旭成1
Yuan Heyi1, Jiang Ruixi1, Huang Weilun1, Liu Yuhao2, Li Xuchen1
- 作者单位:
- 1.中国石油西南油气田公司川西北气矿,2.中国石油川庆钻探工程有限公司井下作业公司
1. PetroChina Southwest Oil & Gasfield Company. Northwest Sichuan Gas Mine, Jiangyou, Sichuan, 621709, China 2. CNPC Chuanqing Drilling Engineering Company Limited. Borehole Service Company
- 关键词:
- 须家河组气藏；油管；CO2腐蚀；数值模拟；一维模型
Xujiahe formation；Tubing；CO2 corrosion；Numerical simulation；One dimensional model
- 摘要:
- 川西地区须家河组气藏井下油管大部分面临CO2腐蚀的问题,通过更换耐腐合金油管或者向井内加注缓蚀剂的方式,取得一定效果,但有部分井下油管腐蚀情况与预计不同。为此，基于化学反应-物质传输耦合模型,研究了流体流动状态下的CO2腐蚀及影响因素,结合现场生产数据进行分析,结果与实际相符。认为在流体流动状态下,温度通过影响物质化学活性改变腐蚀速率,pH通过影响H+浓度改变腐蚀速率,流速通过影响物质传输速度改变腐蚀速率,不同位置的井下油管腐蚀主导因素不同。川西地区须家河组气藏生产井中的油管在化学反应和电化学反应的共同作用下发生腐蚀，其中下部管柱腐蚀速率较高，建议根据引发腐蚀的主导因素分段采取防腐措施。
Since CO2corrosion has become a serious problem in most oil pipelines in Xujiahe formation of western Sichuan, Company launches corresponding researches and carries out a serious of measures, such as replacing with anti-corrosioncoated tubing, injecting anti-corrosion inhibiter, and drawing up tubing replacing scheme which are based on the simulated corrosion rate experiment. All these achieve good results. However, since anti-corrosion measures in some tubing hasn’t meet the expectation, this paper, based on the coupling model, focuses on the CO2corrosion and its impact factors under the condition of fluid flowing state. Analysis with on-site production data shows that temperature affects corrosion rate by altering chemical activity, pH changes corrosion rate by affecting H+concentration, and flow rate alters corrosion rate by affecting substance transmission speed. Besides, corrosion in tubing of different positions has their own dominant factors. It suggested to target on the dominant corrosion factors and adopt corresponding measures.
