南堡3-81井高温尾管固井技术

Liner Cementing under High Temperature for Well Nanpu 3-81

南堡3-81井位于黄骅坳陷南堡凹陷南堡3号构造南堡3-81断背斜高部位,该井斜深为5 939 m,井底静止温度达202℃。在四开钻井过程中发生溢流、井漏等复杂情况,下完尾管后环空间隙小,环空液柱流动阻力大。为了保证固井质量,对该井的难点进行分析,并针对固井难点,优选了抗高温恒低密度水泥浆体系、抗高温常规密度水泥浆体系。通过对现场井浆的优化,配制出了与水泥浆、钻井液相容性好的冲洗隔离液,完善该井的固井配套技术措施。并在南堡3-81井现场应用,固井施工顺利,固井质量为优质。该固井技术为油田深井固井提供了技术支撑。

Well Nanpu3-81 is located in the #3 structure of Nanpu Sag, Huanghua Depression, with hole depth of 5,939 m and static bottom hole temperature of 202 ℃. Well kick and lost circulation had occurred in the fourth interval. After running liner string, the annular space became very small, resulted in high flow pressures. To cement the liner string safely, a high temperature cementing slurry with constant low density, a high temperature normal density cementing slurry, and a spacer that was compatible with the cementing slurries and the mud used for drilling the fourth interval were formulated on the basis of optimization. The liner string was successfully cemented in place using the said cementing technology.