High Efficiency Stimulation Technology for Different Sedimentary Formations in the Erlian Basin

The Erlian Basin is a multi-phase lacustrine basin with a narrow sedimentary belt,drastic varations in sedimentary environment,and strong heterogeneity.Current reservoir stimulation designs have been developed for single wells and reservoir stimulation technology for where the different sedimentary environments absent.Taking the representative Bayindulan Sag of the Erlian Basin as an example,we proposed high-efficiency reservoir stimulation technologies for different sedimentary environments in this paper.We started by analyzing the characteristics of sedimentary facies,microfacies reservoirs,and the reviewed difficulties in reservoir stimulation.We studied new techniques,such as ways to improve the extent of hydraulic fracturing more effectively penetrate the thick layer in fan delta frontal lobe,to control hydraulic fracture heights in low-permeable thin layers,to vary the particle size of proppants.We also reviewed the technique of adding medium-mesh sand and varying the concentration of to control fracture height and to prevent proppant embedment in fan braided channel turbidites.In addition,we proposed a solution for reservoir damage in middle-channel near-shore subaqueous fans by combining acid and sand control during fracturing fracturing for low-permeabilitydolomite.We used these proposed high-efficiency reservoirs stimulation technologies for different sedimentary environments for more than 25 instances for wells in the Bayindulan sag.The average produced fluid after fracturing was 2.1 times that before fracturing,and we had very good field application results.Studies suggest those technologies can not only be promoted in Erlian Basin,but they can also provide reference for the stimulation of oil and gas reservoirs that have similar sedimentary environments with small and medium fault blocks.