WATER BLOCKOFF TECHNOLOGY IN SAINAN OILFIELD

Sangonghe group reservoir is the main reservoir in Cainan Oilfield,however,high water content pumping wells become more and more,and water is found in the lower section of the borehole.By applying the electrical bridge technique,and using the high temperature and high pressure produced by gunpowder to push the slip against the casing wall and inflate the rubber sleeve,so as to isolate the bottom water.In the case of bottom water and exterior casing channeling,blocking and plugging integrated technology is applied,i.e.,inject the high strength composite plugging agent W964 using the stabber bridge,form a barrier under the bridge plug and outside the casing,to stop coning and channelling of bottom water.The two techniques have been used since 1996,and the water blocking-off results were satisfactory.A total of 303 000 tons of oil has been stimulated in 7 years,and the investment to produce rates are 1:27 and 1:4.4.