Causes of Corrosion and Anticorrosion Strategies of Pipe String in Coalbed Methane Wells at the Southern Margin of Junggar Basin

doi:10.3969/j.issn.1006-6535.2023.05.020

Abstract

Abstract: The corrosion of pipe string in coalbed methane (CBM) wells of low-rank coal genesis in HD block at the southern margin of Junggar Basin is common and serious, which restricts the normal production of CBM wells. Unlike the corrosion of pipe string in CBM wells of middle rand-and high-rank coal genesis, the causative factors of pipe string corrosion in HD block are complex and diverse, which are not only related to the characteristics of produced fluids, but also closely related to the properties of coal rocks in the block, the regional geologic conditions, and the borehole structure of drilled and completed wells. Based on the corrosion characteristics of the pipe string in HD block, combined with the analysis data of produced fluid/gas and corrosive components, the mechanism of pipe string corrosion and the strategy of pipe string corrosion prevention were analyzed and researched. The study shows that the corrosion type of pipe string in HD block wells is mainly the electrochemical corrosion, supplemented by stress corrosion, charged pulverized coal corrosion, potential CO₂ corrosion, etc., and the same kind of corrosion has a potential pattern of concentration by zone or by subzone. According to the corrosion characteristics of gas well pipe strings in HD block, a strategy for preventing and controlling the corrosion of CBM well pipe strings is proposed, and preliminary results have been achieved after application. The results of the study can provide theoretical and technical guidance for the analysis of the corrosion mechanism and the formulation of corrosion prevention strategies for pipe strings in CBM wells of low-rank coal genesis.

Key words: CBM of low-rank coal genesis, pipe string corrosion, electrochemical corrosion, Junggar Basin

CLC Number:

TE38

Wang Junbo, Tian Jijun, Li Fei, Zhang Xuanming, Ji Dongliang, Wang Xianmei, Li Xin. Causes of Corrosion and Anticorrosion Strategies of Pipe String in Coalbed Methane Wells at the Southern Margin of Junggar Basin[J]. Special Oil & Gas Reservoirs, 2023, 30(5): 151-157.

References

[1] SUN Z,WANG W Y,SHEN H L.Action of coal on mental corrosion in coal mines[J].Journal of China University of Mining & technology,1998,8(1):27-31.
[2] 梁智飞,刘长松,甄怀宾,等.韩城区块煤层气井二次改造工艺优化及现场试验[J].石油钻探技术,2022,50(3):92-98.
LIANG Zhifei,LIU Changsong,ZHEN Huaibin,et al.Optimization and field application of secondary stimulation technologies for coalbed methane wells in Hancheng Block[J].Petroleum Drilling Techniques,2022,50(3):92-98.
[3] EZIAKU O A.Potential corrosion inhibitor for acid corrosion of mild steel[J].Materials Sciences and Applications,2017,8:476-483.
[4] 彭兴,周玉仓,朱智超,等.延川南深部煤层气井防漏堵漏技术[J].石油钻探技术,2021,49(1):47-52.
PENG Xing,ZHOU Yucang,ZHU Zhichao,et al.Antileaking and lost circulation control technology for deep coalbed methane well in the Yanchuannan Block[J].Petroleum Drilling Techniques,2021,49(1):47-52.
[5] 丁士东,刘奎,刘小刚,等.环空加压固井对双层套管水泥环界面径向应力的影响[J].石油钻探技术,2022,50(1):30-37.
DING Shidong,LIU Kui,LIU Xiaogang,et al.The effect of pre-applied annulus back pressure cementing on radial stress of interfaces in double layer casing systems[J].Petroleum Drilling Techniques,2022,50(1):30-37.
[6] 田建峰.靖边气田气井管柱腐蚀机理及防护对策研究[D].西安:西安石油大学,2008.
TIAN Jianfeng.Research on corrosion mechanism and protection countermeasures of gas well tubing string in Jingbian Gas Field[D].Xi'an:Xi'an Shiyou University,2008.
[7] ARATA A,KIOKA A,NAKAGAWA M,et al.Nanobubbles as corrosion inhibitor in acidic geothermal fluid[J].Geothermics,2021,89:1-9.
[8] 王思凡,张安康,胡东锋.连续油管打捞砂埋节流器技术研究与现场试验[J].石油钻探技术,2021,49(5):108-113.
WANG Sifan,ZHANG Ankang,HU Dongfeng.Research and field tests of coiled tubing fishing technology for sand-buried throttles[J].Petroleum Drilling Techniques,2021, 49(5):108-113.
[9] TAMURA H.The Role of rusts in corrosion and corrosion protection of iron and steel[J].Corrosion Science,2008,50:1872-1883.
[10] 陈朝伟,黄锐,曾波,等.四川盆地长宁页岩气区块套管变形井施工参数优化分析[J].石油钻探技术,2021,49(1):93-100.
CHEN Zhaowei,HUANG Rui,ZENG Bo,et al.Analysis and optimization of construction parameters for preventing casing deformation in the Changning shale gas block,Sichuan Basin[J].Petroleum Drilling Techniques,2021,49(1):93-100.
[11] WANG Y G,CHENG L,XIA Y Y.Electrochemical profile of nano-particle coal double hydroxide/active carbon supercapacitor using KOH electrolyte solution[J].Journal of Power Sources,2006,153:191-196.
[12] 邓奇根,温洁洁,刘明举,等.基于泉(井)水特征的准噶尔盆地东南缘煤矿硫化氢成因分析[J].河南理工大学(自然科学版),2018,37(1):8-14.
DENG Qigen,WEN Jiejie,LIU Mingju,et al.Study on the formation of hydrogen sulfide in coal mines of southeastern margin of Junggar basin based on the characteristics of spring(well)water[J].Journal of Henan Polytechnic University (Natural Science),2018,37(1):8-14.
[13] 魏迎春,张强,王安民,等.准噶尔盆地南缘煤系水矿化度对低煤阶煤层气的影响[J].煤田地质与勘探,2016,44(1):31-37.
WEI Yingchun,ZHANG Qiang,WANG Anmin,et al.The influence of the salinity of groundwater in coal measures on low rank coalbed methane in the south margin of Junggar Basin[J].Coal Geology & Exploration,2016,44(1):31-37.
[14] 陈立超,王生维,张典坤,等.陇东地区煤层气井油管柱腐蚀机理研究[J].西南石油大学学报(自然科学版),2020,42(1):170-180.
CHEN Lichao,WANG Shengwei,ZHANG Diankun,et al.Corrosion mechanisms of tubing string of coalbed methane wells in eastern Gansu[J].Journal of Southwest Petroleum University(Science & Technology Edition),2020,42(1):170-180.
[15] 尚万宁,乔玉龙,闫昭,等.鄂尔多斯盆地靖边气田气井油管腐蚀规律与防腐对策[J].天然气工业,2013,33(2):115-120.
SHANG Wanning,QIAO Yulong,YAN Zhao,et al.Corrosion law of oil tubings and prevention countermeasures in gas wells of the Jingbian Gas Field,Ordos Basin[J].Natural Gas Industry,2013,33(2):115-120.
[16] 王一兵,王诗棋,线远红,等.阜康西部四工河煤层气管杆腐蚀现状、特征及对策[J].石化技术,2021,28(9):141-143.
WANG Yibing,WANG Shiqi,XIAN Yuanhong,et al.Current situation,characteristics and countermeasures of coalbed methane pipe rod corrosion in Sigong River,west Fukang[J].Petrochemical Industry Technology,2021,28(9):141-143.
[17] 岳明,龙岩,张腾,等.某页岩气井管柱腐蚀原因分析[J].石油管材与仪器,2021,7(6):84-89.
YUE Ming,LONG Yan,ZHANG Teng,et al.Corrosion cause analysis of tubing string used in a shale gas well[J].Petroleum Tubular Goods & Instruments,2021,7(6):84-89.
[18] 崔建斌,张聪,樊彬,等.煤层气井管柱防腐措施及效果评价[J].中国煤层气,2022,19(1):32-35.
CUI Jianbin,ZHANG Cong,FAN Bin,et al.Application and evaluation of anti-corrosion measures on tubing strings of coalbed methane wells[J].China Coalbed Methane,2022,19(1):32-35.
[19] 冀文雄.筠连煤层气井阻垢缓蚀剂筛选优化及现场应用[D].青岛:中国石油大学(华东),2019.
JI Wenxiong.Screening optimization of scale and corrosion inhibitor for Junlian coalbed methane gas well and its field application[D].Qingdao:China University of Petroleum(East China),2019.
[20] 常振,铁磊磊,王浩颐,等.煤层气井管柱阻垢缓蚀剂的筛选及现场应用[J].当代化工,2022,51(3):565-570.
CHANG Zhen,TIE Leilei,WANG Haoyi,et al.Screening of scale and corrosion inhibitor for rod strings and tubing of coalbed methane (cbm)well and its field application[J].Contemporary Chemical Industry,2022,51(3):565-570.
[21] 刘洁,袁建军.硫酸钙结垢及其防治技术应用进展[J].天津化工,2010,24(2):10-14.
LIU Jie,YUAN Jianjun.Calcium sulfate scaling and its advances in application of control techniques[J].Tianjin Chemical Industry,2010,24(2):10-14.
[22] GARDINER C P,MELCHERS R E.Corrosion of mild steel by coal and iron ore[J].Corrosion Science,2002,44:2665-2673.
[23] SAZOU D,PAGITSAS M.Electrochemical instabilities due to pitting corrosion of iron[J].Russian Journal of Electrochemistry,2006,42(5):476-490.
[24] KASAI N,KAKU Y,OKAZAKI S,et al.Mechanism for corrosion prevention by a mechanical plating of uniform zinc-iron alloy[J].Journal of Materials Engineering and Performance,2016,25(11):4680-4685.
[25] 陶建红.褐煤中含氧官能团的测定与研究[J].河南化工,2010,27(4):8-10.
TAO Jianhong.Research and measurement on oxygen-containing functional groups in brown coal[J].Henan Chemical Industry,2010,27(4):8-10.