Abstract
In this study, the effect of fracturing fluid on the permeability of tight oil reservoirs is analyzed through oil absorption. The mechanism of permeation and absorption in tight oil reservoirs was studied using the molecular dynamics simulation of fluid flow through fractures in porous media containing crude oil. The influence of surfactants on the adsorption characteristics of crude oil formations on rock walls was also examined. The research results show that the introduction of the appropriate surfactant to the fracturing fluid could accelerate the rate of percolation and recovery as well as improve the recovery rate of absorption. The optimal concentration of polyoxyethylene octyl phenol ether-10 (OP-10) surfactant in the fracturing fluid was 0.9%. When the percolation reached a certain stage, the capillary forces in the crude oil and percolation medium in the pore stabilized; accordingly, the crude oil from the pore roar should be discharged at the earliest. The fluid flow through the fracture effectively carries the oil seeping out near the fractured wall to avoid the stability of the seepage and absorption systems. The surfactant can change the rock absorbability for crude oil, the result of which is that the percolating liquid can adsorb on the rock wall, thus improving the discharge of crude oil. The results of this study are anticipated to significantly contribute to the advancement of oil and gas recovery from tight oil reservoirs.
Highlights
For tight reservoirs, fracturing is one of the most effective stimulation methods to improve oil recovery and increase oil and gas production
There are few theoretical studies on oil absorption through tight oil reservoirs, and it is believed that oil absorption is influenced by the interfacial tension between oil and water, the viscosity of crude oil, the capillary force of fluids in porous media and the fracture system
Crude oil mixed with kerosene was used as the experimental oil; In this study,temperature crude oil mixed withwas wasguanidine used as the experimental
Summary
For tight reservoirs, fracturing is one of the most effective stimulation methods to improve oil recovery and increase oil and gas production. Processes 2020, 8, 972 influence on the effect of infiltration and absorption, Mason et al [2,3] improved the theoretical model of self-absorption based on rock wettability and pore characteristics. For percolation and recovery of tight oil, the fracture characteristics exhibited a major influence on the permeability and absorption development effects. There are few theoretical studies on oil absorption through tight oil reservoirs, and it is believed that oil absorption is influenced by the interfacial tension between oil and water, the viscosity of crude oil, the capillary force of fluids in porous media and the fracture system. Based on the characteristics and drainage of the oil absorption paper, the effects of surfactant content on the permeability and absorption of a guanidine rubber fracturing fluid system was more rigorously studied.
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