Residual oil and potential tapping technology in the late stage of interbedded super heavy oil stimulation

Steam huff and puff development was adopted in Shuyi area of Shuguang oilfield, after nearly 20 years development, obvious development results were obtained. However, due to the current reservoir understandings and oil extraction technology, the reservoir production degree was only 22 %, and a large amount of residual oil was not effectively utilized. Based on the characteristics and development practice of the interbedded super heavy oil reservoir, the distribution regularity of the surface and longitudinal residual oil of the cross-layered super heavy oil reservoir were studied by means of the commonly used methods such as logging, testing and dynamic means of production. It was proposed to excavate the residual oil in the plane by increasing the number of wells, adjusting the injection and mining methods, optimizing the energy enhancement measures, and excavating the residual oil in the longitudinal direction by means of adjusting the layer to fill the holes, deepening the injection pipe columns, and implementing alternative injection measures. After field application, the comprehensive reduction control of super heavy oil in 2017 was less than 4 %, which achieved good development results.