Fracturing technology for low temperature and low pressure sandstone reservoirs in the salt slope zone of Kenkiyak Oilfield
The main reservoir depth of Permian sandstone reservoir in upper salt slope of Kenkiyak Oilfield in Kazakhstan is 900 m～1 350 m,the original formation pressure coefficient is about 1.0,and the temper-ature of the reservoir is about 25 ℃～35 ℃.Due to the fact that the reservoir belongs to a high angle mono-clinic reservoir,with poor connectivity between adjacent wells for the same layers and small north-south span of the reservoir,and then the deployment conditions of water injection development pattern are not available.The oil wells in the block have been exploited in a mode of depletion after putting into produc-tion,without water injection and other measures,the formation pressure coefficient has been reduced to about 0.61,average single well production has been as low as 2～5 t/d.In order to explore the adaptability of fracturing technology,aiming at the technical problems such as the difficulty of fracturing gel breaking and flow-back after fracturing operations,the analysis of production increase potential of sand fracturing measures,the optimal evaluation of easy breaking and flow-back fracturing fluid system were carried out indoors,and the first well application was carried out in well Kxxx9,and the production was increased by more than 8 times.The effect of these measures was great,which provided a new technical idea for the de-velopment of reservoir.
low temperature and low pressuremonoclinic reservoirdepletion?development modegel breakingsand fracturing
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