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下管是大口径水井成井的一道重要工序.由于井管口径大,整个井管的重量往往大于钻机的提吊能力,因而下管困难,甚至造成事故. 我们在通辽施工的一口供水井,井径550mm,井深180～220m.使用QZ-200泵吸反循环钻机.钻机最大提升能力12t,下管φ377×12无缝钢管,全套管重近20t.采用浮力下管法,即在下管80m处装一木质锥形浮力塞将管密封,孔内冲洗液的浮力抵消部分管重,从而减轻了钻机升降机的负荷,顺利地将井管下到井底.井管下到井底后,将锥形浮力塞钻碎,碎木块即浮上井口.采用电焊连接井管的方法,下187m管只需一天时间.
Under the pipe is a large diameter wells into an important process.Due to the well bore diameter, the weight of the entire well tube is often greater than the lifting capacity of the rig, so under the tube is difficult, or even cause an accident.We are in Tongliao construction a water supply well, well Diameter of 550mm, depth of 180 ~ 220m. The use of QZ-200 pump reverse circulation drilling rig. Rig maximum lifting capacity of 12t, under the tube φ377 × 12 seamless steel tubes, full tube weight of nearly 20t. Buoyancy under the tube method, that is, Install a wooden conical buoyant tube to seal the buoyancy of the flushing liquid in the hole to counteract part of the pipe weight so as to reduce the load on the rig lifter and smoothly downhole the well pipe to the bottom of the well. Shaped buoyancy drill broken, broken pieces of wood that floats on the wellhead.With the method of welding well pipe connection, under 187m tube only one day.