The imbalance of water injection and oil production in
complex blocks in Zhongyuan oilfield has caused severe
turbulence of formation pressure system ,of which different
pressure levels exit in the same open hole1Lost circulation is
easy to occur during cementing process with unstable pressure
in oil/ gas/ water zone , which brings about poor cementing
quality such as low cement top and unsealed oil/ gas/ water
zones1By taking concrete measures of anti2loss and stabilizing
pressure , problems concerning cementing quality have been
better solved and cementing quality has gradually improved in
the area with complex blocks.
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