摘要
泄漏效应引起持续环空压力以及H 2S侵入环空造成油层套管腐蚀严重威胁高含硫化氢气井的安全生产,因此保障井筒在全生命周期始终处于完整可靠服役状态显得尤为重要。为此,文章首先结合理论图版和高频超声波测漏技术建立了一套井下漏点综合诊断方法,以实现井下漏点位置的准确确定;然后通过自制的压差堵漏实验仪对自主研发的压差激活封窜剂进行了封堵性能评价,同时也对形成的高强度凝胶开展了承压性和热稳定性评价;最后结合现场实际情况,制定了井下堵漏实施前提条件并配套了相关堵漏工艺。现场应用效果表明,研制的压差激活封窜剂以及配套的堵漏工艺能实现井下漏点的成功封堵,可在类似高含硫化氢气田推广应用。
Sustained casing pressure caused by downhole leakage and production casing corrosion due to H2 S invasion into annulus will seriously threaten the safe production of high sulphur gas wells. Therefore it is especially important to ensure the wellbore’s integrity and reliable service status throughout the life cycle. Firstly,combining the theory chart and the high frequency ultrasonic logging,a downhole leak points diagnosis method is established. This can realize accurate location of downhole leakage. Then,evaluation of the sealing performance of the self-developed differential pressure activated sealant is carried out by the experimental facility. The pressure-loading and thermal stability of the high strength gel formed are also carried out. And combined with the field situation,the precondition and procedures of downhole plugging operation are put forward. The field application shows that the self-developed differential pressure activated sealant and the corresponding plugging process can realize the successful blocking of downhole leak points,and it can be applied in similar high sulphur gas fields.
出处
《钻采工艺》
CAS
北大核心
2019年第4期44-46,8,共3页
Drilling & Production Technology
基金
南充职业技术学院博士科研启动项目“井下自动相选择控水阀研发及性能评价”(编号:ZRA1902)
关键词
高含硫化氢
井下漏点
诊断方法
压差激活封窜剂
堵漏工艺
high sulphur content
downhole leak points
diagnosis method
differential pressure activated sealant
plugging technology
