JIA Jianghong; CHENG Yuanfang; ZHAO Xiuta; QU Zhanqing; FENG Weiqiang and FENG Puyong
, 2008, 35(3): 1607-0.
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Most reservoirs in the Chunliang Oilfield are low permeability reservoirs characterized by multiple oil layers, thin single layer, poor physical property, complex lithology and serious aeolotropy. They are seriously damaged during drilling, completion, production, water injection and well repairing, as a result, the injection-production pressure difference is high and the single-well oil production low. The key factors causing the formation damage are reservoir property, external fluid and unreasonable stimulation. A low-damage, comprehensive plug-removing agent (CJD-1) is developed based on the formation characteristics and the damage mechanism. Laboratory test and field application show that the agent has good efficiency of relieving blocking, deep penetration and low damage to rock skeletons. It was applied to 9 oil wells and 10 water wells with success ratio of 100%. According to the statistics, the average validity period is over 200 d, the average single-well incremental oil is 481.3 t, and the average incremental injection of individual water well is 7 441.2 m3 during the period of validity.