摘要
带压钻孔与冷冻暂堵是气井井口隐患治理中常用的两项特色技术。川渝及长庆气区绝大部分隐患井通过其中一种技术即可成功治理,但对于部分情况复杂的隐患井,采用单一技术无法成功处置。为了解决上述复杂气井井口隐患治理难题,以中国石油西南油气田公司X井为研究对象,分析了其井口隐患治理难点,提出了相应的技术对策并成功应用。研究结果表明:①对于没有冷冻介质注入通道的井可通过带压钻孔技术进行开孔建立冷冻介质注入通道;②通过带压钻孔建立的通道注入冷冻介质时,冷冻介质可能填满整个井口装置,作业结束后应做好环保措施,防止冷冻介质解冻后落地污染环境;③对于此类采气树阀门存在内漏的井,冷冻介质实际注入量将大于施工设计注入量,作业时应加大冷冻介质注入量避免冷冻介质漏失造成冷冻失败。结论认为,"带压钻孔+冷冻暂堵"技术思路的提出与成功应用为井口装置复杂隐患治理提供了方法,值得推广应用。
Two distinguished technologies of both drilling under pressure and frozen temporary plugging are commonly used to remove hidden troubles at wellhead.For most gas wells in Sichuan-Chongqing and Changqing areas,some hidden troubles can be removed successfully by means of either technology.However,troubles in many complex wells cannot be removed successfully by only one technology.So,this paper took X well deployed by PetroChina Southwest Oil&Gasfield Company as an example to analyze removal difficulties.And then several corresponding countermeasures were made.Results show that,(1)as for those wells without channels to inject frozen medium,the drilling under pressure can be adopt ed to establish injection channels;(2)when the frozen medium is injected through the established channels,it may fill in the whole wellhead devices.Therefore,after finishing this operation,some measures on environmental protection shall be made to prevent frozen medium from falling to ground or polluting environment after it is unfrozen;(3)for other wells with internal leakage at valves of Christmas tree,an actual injection volume of frozen medium is higher than a designed one,so the volume shall be increased so as to avoid freezing failure caused by medium leakage;and(4)to develop and successfully apply both drilling under pressure and frozen temporary plugging may provide tools for removing complex hidden troubles at wellhead devices.
作者
胡旭光
刘贵义
胡光辉
Hu Xuguang;Liu Guiyi;Hu Guanghui(Drilling&Production Technology Research Institute,CNPC Chuanqing Drilling Engineering Company Limited,Guanghan,Sich uan 618300,China;National Energy R&D Center of High-Sulfur Gas Reservoir Exploitation,Chengdu,Sichuan 610051,China)
出处
《天然气技术与经济》
2020年第1期53-56,63,共5页
Natural Gas Technology and Economy
基金
中国石油集团川庆钻探工程有限公司科技项目“隐患井口治理技术研究”(编号:CQ2014B-1-1-3)。
关键词
带压钻孔
冷冻暂堵
井口隐患
治理难点
技术思路
Drilling under pressure
Frozen temporary plugging
Hidden troubles at wellhead
Removal difficulties
Techni cal Ideas
