克深气田异常高压气井井筒异常堵塞治理

随着克深气田的开发,井筒堵塞井数增多,堵塞程度越来越严重,影响了单井的安全平稳生产,制约了气田的高效开发。为此,针对气井井筒堵塞现状,结合单井生产动态特征、现场解堵情况、井筒返出物系统分析,认为造成气井井筒堵塞的主要堵塞物为垢和砂,堵塞模式分为垢堵、砂堵和砂垢混合堵3种模式。根据堵塞模式特点及井筒完整性,结合酸化解堵、连续油管冲砂解堵和大修3种传统疏通井筒措施的优缺点,提出了4种综合治理措施:垢堵井采用酸化解堵,砂堵井采用连续油管冲砂解堵,砂垢混合堵井采用连续油管冲砂和酸化综合解堵,管柱错断井采用大修更换管柱。实际应用证明,分模式治理不但可以高效疏通井筒,同时也可降低生产成本。

Management of Abnormal Wellbore Plugging in Abnormal-High Pressure Gas Wells,Keshen Gas Field

With the development of the Keshen gas field,the number of plugged wells is gradually increasing,and the degree of plugging is becoming more and more serious,which has affected the safe and stable well production and restricted the efficient development of the gas field.Therefore,aiming to the current situation of wellbore plugging and combined with well production performance,in?situ plugging re?moval situation and systematical analysis of wellbore returns,it is considered that the main factors causing wellbore plugging are scale plug and sand plug,and the plugging mode is divided into three types:scale plug,sand plug and sand?scale mixed plug.According to the charac?teristics of the three plugging modes and wellbore integrity,four targeted measures are proposed:applying acidizing unplugging technology in the scale plugging wells,applying coiled tubing technology in the sand plugging wells,applying coiled tubing and acidization in the sand?scale mixed plugging wells and replacing pipe string in the pipe string breaking wells.The actual results show that the application of the four measures can effectively dredge the plugged wellbores and meanwhile reduce the production cost.