注入井套管保护封隔器密封性判定技术  

Sealing evaluation technology of casing protection packer in injection wells

作　　者：蔡苗苗 CAI Miaomiao(No.3 Oil Production Plant,PetroChina Daqing Oilfield Co.,Ltd.,Daqing,Heilongjiang 163000,China)

机构地区：[1]中国石油大庆油田有限责任公司第三采油厂,黑龙江大庆163000

出　　处：《油气井测试》2021年第6期51-56,共6页Well Testing

摘　　要：针对大庆油田注入井套管保护封隔器没有成型验封方式,套损风险大的问题,研究了套管保护封隔器密封性判定技术,研制出地上验封设备。该设备由数字式压力计和地面数据记录仪两部分组成。控制注水阀门执行“开-关-开”操作,使油压“高-低-高”变动,通过观察地面数据记录仪录入的油、套压变化曲线确定套管保护封隔器密封性能:套压呈现“高-低-高”伴随趋势,则不密封;套压稳定不变,则密封。利用井下验封设备和地上验封设备对套管保护封隔器验封,经现场60井次试验,验封结果符合率达99%。该技术实现了套管保护封隔器的科学验封,具有广阔的应用前景。The casing protection packer for injection wells in Daqing Oilfield has no formed sealing inspection method,and the risk of casing damage is high.In order to solve this problem,this paper studies the sealing judgment technology of casing protection packer and develops the ground sealing inspection equipment.The equipment consists of digital pressure gauge and ground data recorder.It can control the water injection valve to perform the“on-off-on”operation to make the oil pressure change with the trend of“high-lowhigh”.The sealing performance of the casing protection packer is determined by observing the tubing and casing pressure change curve recorded by the ground data recorder:if the casing pressure presents the accompanying trend of“high-low-high”,it is not sealed;If the casing pressure is stable,it means sealing.Comparing the casing protection packer sealing effect of downhole sealing inspection equipment and surface sealing inspection equipment in 60 well tests,the coincidence rate of sealing inspection results is 99%.This technology realizes the scientific sealing inspection of casing protection packer and has broad application prospects.

关 键 词：大庆油田 注入井 套管保护封隔器 套损 验封方式 密封性 油压 套压 

分 类 号：TE353[石油与天然气工程—油气田开发工程]