Multifunctional drainage aid reduces liquid resistance effect and improves drainage

An oil field block in Russia is a typical ultra-low permeability oil reservoir. The reservoir sediment type in this block is mainly sandy debris flow and turbidity current deposition. The reservoir physical properties are poor. The pore type is mainly secondary pores. The pore throats are small and the median pore throat radius is 0.10-0.18 μm. , the average porosity of the reservoir is less than 9.2%, and the gas permeability is less than 0.41×10-3μm2. The oil field selected two horizontal wells in this block to test our products. Under the conditions of close well spacing, the same stimulation layer, and the same amount of fluid entering the ground, after using Multifunctional drainage aid, compared with the drainage aid product used before, the fracturing fluid flowback rate of the test well increased from 20.89% to 21.37%, respectively. % increased to 27.39% and 28.15%, and the fracturing fluid flowback rate of the test well increased by 6.50% and 6.78% respectively, indicating that the use of Multifunctional drainage aid can effectively reduce the "liquid resistance" effect of the reservoir and increase the flowback rate.