高效失水堵漏剂在塔河油田二叠系的应用

对S119-3井井深5115m石炭系储层作承压堵漏试验，经过4次惰性材料桥塞堵漏未成功，改用高效失水堵漏剂HHH与清水配置堵漏。该剂具有高效、高失水、高强度等特点，但在配置高密度堵漏浆时，存在悬浮能力差，失水量快，一旦静止很容易沉积于罐底、管线和钻杆中；当堵漏浆与井壁接触，迅速失水、泥饼增厚、结块、易卡钻具。通过实验调整CMC加量为0.15％，提高堵漏浆悬浮能力和延缓其全失水时间。大样全失水时间较长，超过预期控制全失水时间40~60min，大样120min没有完成失水，达到堵漏设计中施工时间要求。实际1.46g/cm3的堵漏浆没有沉淀和堵塞管道，堵漏获得成功，为后期施工井堵漏提供了可靠的依据

THE APPLICATION OF THE HIGHLY EFFCTIVE LOST CIRCULATION ADDITIVE IN THE PERMIAN IN TAHE OILFIELD

The pressure sealing test is carried out to the Carboniferous reservoirs of well S119-3 at the depth of 5115 meters，after four times of unsuccessful inert material bridge plug sealing，highly effective loss circulation additive HHH combining with fresh water is applied to seal.The additive is of the characteristic of high effect，high water loss and strong leakagesealing，the analysis of high density sealing slurry indicates that its suspending property is poor，water loss is fast and the slurry is easy to deposit to the bottom of tanks，pipelines or in drilling pipes while resting，when the slurry contacts the well bore wall，water loss occurs quickly，mud cake increases in thickness，chunks are formed and the drilling pipes are easily stuck.By experimental adjustment，the amount of CMC is increased 0.15%，the suspending property of sealing slurry is enhanced and the full water loss time is delayed.The time for full water loss is longer，40~60 min more，in 2 hours，water is not completely lost，the requirement for operative time in leakage sealing design is met.The 1.46g/cm3 leakage sealing slurry does not precipitate and plug pipes，the operation is successful.