Superimposed plates of energy curves to enhance oil recovery of carbonate reservoirs

Carbonate reservoirs in the Tahe oil field are composed of dissolved pores, karst caves and fractures, among which the fractures are the main seepage pathways. The reservoirs are deep buried and usually have a strong heterogeneity. The study of pre-production and well performance data indicated that, formations collapsed and cracks closed in production process due to the decrease of formation energy, resulting in insufficient liquid supply during post-oil production. Therefore, we applied energy indicating curves to guide production, and made some achievements. The Tahe wells have a complicated oil and water contact, and some well bores have abnormal conditions, which are restrictive for energy indicating curves. We divided the curves to several different types, and analyzed their corresponding reservoir geological reasons. We also considered water content and water flooding, and converted pressure to load, and finally made a superimposed plate of energy curves to guide production.