Gas proof type pump separate zone oil production technology in Changqing oilfield

The Triassic Yanchang group is the main development layer system in Changqing oilfield, and the reservoir in the longitudinal takes the form of multiple sets of small overlapping. Affected by several factors such as advanced water injection and commingled water injection, interlayer pressure difference of oil wells is always higher in two layers commingled producing, and the contradiction between layers is clear enough. Separate zone production with corresponding pump is always one of the main methods to eliminate the contradiction of interlayer interference in commingled producing. In view of low saturation pressure, small saturation pressure difference and high oil gas ratio in Triassic reservoir of Changqing, a gas proof type separate zone production pump with "crisscrossed pumping" has been developed to provide gas drainage channel for separate oil layers, and great adaptability was presented in the wells with high gas oil ratio. Field test and application shows that, separate production effect of oil well with gas proof type separate zone production pump is apparent, and has explored a new way for effectively developing composite reservoirs in Changqing Oilfield.