PLUGGING TECHNIQUE WITH SUPERFINE CEMENT

More and more geologic factors and seriously damaged tubings in after-development of water injection have influenced development effect.According to above problems exist in water injection development in Henan Oilfield, formulation, performance and adaptability and so on of water shutoff agent of superfine cement have been studied.At last the study have gained evidence plugging effect, the agent can plug high water cut oil well formation of oil well, abandoned un-injection formulation of water injection well, channeling, perforation and leaking in thread on outside casing of oil and water well.During the period From August 1998 to December 2001, the technique was used in wells 61 times, 36 of which were in oil wells and 25 in water wells, It’s efficiency has attained to 85.3%.Oil Production total incresed 1.441 ×104 t, water amount decresed to 7.6123 ×104 m3 yearly.Injection wells increased water amount by 14.32×104 m3, the amount of non-effective injecting water is controlled by 16.95×104 m3, and gained 18.52 million RMB, input-output ratio is 1:11.36, so the technique is worth being widely popularized.