A Study on Plugging Mechanism and Unplugging Technologies in Unconsolidated Sand stone Reservoirs with High Clay Content in Zhuangxi Oilfield

Drilling cycle is long in#106block in Zhangxi oil-fie ld due to its location in beach area.It addition,reser-voirs in the Ng Forma tion is unconsolidated sandstones with high clay content.Thus,pay zone polluti on and sand production are serious and sand control effects are poor.Potential reservoir damage mechanism and the damage mechanism of sand control measures are studied,and un-plugging fluid systems are optimized.An operation processsui table for use in this block is presented in this paper.Its field application ac hieved good effects.