摘要
对蜀南地区煤层气井筒垢以及筒内水样进行取样分析,发现井筒垢主要成分为碳酸钙以及少量铁化物和煤粉等,水样中含有较高浓度的Ca^(2+)以及HCO_3^-等成垢离子。基于蜀南地区龙潭组煤层气地质特征和井筒环境,探讨了煤层气井筒的结垢机理和防垢方法。结果表明,碳酸钙垢的成因主要是由于流体压力降低导致二氧化碳从水中大量析出所致,而铁化物垢主要是在存在硫酸盐还原菌的条件下油管和抽油杆发生无氧腐蚀造成的。针对煤层气井排水采气工艺特征,提出了周期性往油套环空注KG201阻垢剂的方法来进行防垢,现场检泵反馈垢层厚度明显减小,防垢效果较好。
Analysis of samples of scaling and water taken from Shunan area coal bed methane wellbores shows that scaling components are mainly carbonate,and a small amount of iron compound and coal fines,and water samples contain highly concentrated scale-forming ions such as calcium ions,bicarbonateions. The scaling mechanism and anti-scaling methods are discussed in this paper based on the geological characteristics of coal bed methane and wellbore environment in Longtan Formation,Shunan area. The results indicate that the cause of the calcium carbonate is mainly the release of Carbon dioxide from water as fluid pressure drops,and the cause of iron compound is anaerobic corrosion of tubing and sucker rod for SRB. At last a method is put forward：KG201 inhibitor is periodically injected into annulus between the tubing and the casing. Field workover proves that thickness of scale deposit decreases obviously,indicating the method is very effective.
作者
王林
王维旭
马飞英
谢波
鲍祥生
贺满江
WANG Lin;WANG Weixu;MA Feiying;XIE Bo;BAO Xiangsheng;HE Manjiang(College of Petroleum Engineering,Guangdong University of Petrochenfical Technology,Maonfing 525000,China;Unconventional Energy Engineering Technology Research Center of Guangdong Province,Maonfing 525000,China;Zhejiang Oil Field,CNPC,Hangzhou 310013,China;South Sichuan Gas Field,PetroChina Southwest Oil ＆ Gasfield Company,Luzhou 646000)
出处
《广东石油化工学院学报》
2018年第4期1-4,共4页
Journal of Guangdong University of Petrochemical Technology
基金
广东省扬帆计划项目(916022)
茂名市科技计划专项资金项目(917322)
广东石油化工学院科研基金项目(517148)
关键词
煤层气
井筒
结垢
防垢
Coal bed methane
Wellbore
Scaling
Anti - scaling
