THE APPLICATION OF SEPARATE LAYER CHAMICAL PLUGGING TECHNOLOGY IN PUCHENG OILFIELD

After 20 years development, Pucheng Oilfield has been in the high water cut stage, whose production is in descending stage and the water cut is 92%.Since the effect of PI control technology was getting deteriorated, the technology of separate layer water plugging has been studied and developed. This technology includes temperature water locating, water locating with packer and separate layer swabbing. The used agents include oil well cement, DSZ-A agent and STP-01 agent. The technology has two types according to the water plugging types. One is plugging the upper part and producing the lower part using cement plug, wireline bridge plug, mechanical plug and fill sand. The other one is plugging the middle part and producing the upper and the lower, which filling sand in the lower part, separating the upper part with packer and plugging the middle with chemical agents, or using the separate layer injection pipe of stride model 98-1. The technology is science, reasonable and easily operated.