Research And Application Of Tight Oil Development Technology In Santanghu Oilfield

Based on the advanced SRV development technology,both domestic and overseas unconventional resources,in 2013 and 2014 Santanhu oil reservoir through horizontal wells and multi-stage fracturing achieved a breakthrough by the end of 2015,putting the total of 54 horizontal production wells,gaining the initial average single well oil production to 16.5t / d,total oil production to 286 tons,single well oil production to 5.4 tons / day with oil production rate of 0.36% and the ultimate recovery of 0.63%.In the early development of tight oil reservoir which only constitute the natural energy,with the failure of well stimulation(fracturing),single well showed drop in the cumulative oil production below the economic limit,forecast 5.6%.In order to solve this problem,it was very important to improve the oil recovery technology for tight oil,in order to fundamentally improve the reservoir development effect and achieve sustained and effective development,combined with the main reservoir characteristics.To solve this problem,this paper studies the tight oil reservoir in Santanghu oil field as an example.First,the basic situation and development characteristics of tight oil reservoir are introduced,and the existing problems of horizontal well + volumetric fracturing development was analyzed,and the feasibility of increasing formation energy and improving recovery efficiency was put forward.Through the horizontal well water injection test,nitrogen stimulation,or repeated fracturing technology portfolio,we selected the best one as the final scheme,suitable for tight oil recovery technology,increase the cumulative oil production for single wells,thus,improve the economic efficiency,so as to achieve the effective use of geological reserves.