Well Stimulation Techniques on Carbonate Reservoirs of Eastern Siberia: Case History

Abstract

Abstract East Siberia oil-and-gas province, which has not been fully developed until now, is Russia's primary reserve for future increment and steady production of oil and gas. Relevance of Eastern Siberia oil-and-gas area (hereafter OGA) development is represented by the fact that considerable reserves of oil and gas remain unexplored at this stage. East Siberia carbonate reservoirs are characterized by complex porosity and permeability properties associated with a variety of interstices (fissures, pores, caverns), high gas content of in-place oil and high bubble point pressure. Core analyses for selection of hydrochloric acid compound components are essential for detailed examination of porosity and permeability properties of carbonate reservoirs. Analyses for selection of hydrochloric acid compound components when testing carbonate reservoirs can considerably contribute to information content for future well stimulation works. Surveys of wells # 71 and 73 of Danilovskiy license block confirm that large-volume hydrochloric acid treatment increases flow rate considerably as well as improves collecting properties of the well. The most appropriate and efficient methods successfully applied on wells in Eastern Siberia for flow stimulation are hydrofracturing (HF) and large-volume hydrochloric acid treatment of formation bottom-hole zone.