We innovatively propose a research method through micro-experiment + macro-measurement, combined with onsite proppant return test. This method can solve the problem of unclear impact of the return shut-in time, return rate control and return effect on production. We carried out a specific applied research for Fuling shale gas Jiangdong block, specifically determined the mineral composition, overburden pressure physical properties before and after fracturing fluid percolation, the changing law of resistance environment of gas production channel inside the reservoir before and after fracturing fluid percolation, and explored the settlement problem of proppant's size, type and nature in the fracture through the situation of sand return. This study concludes that the reservoir testing process can be divided into pure fluid production stage, gas breakthrough stage, and stable production stage. The optimal contact time between shale and fracturing fluid promotes the hydration of clay minerals to produce microfractures and the formation of a complex network of intercommunicating seams facilitated by external dynamics, which promotes gas production. And the wrong return after fracturing will affect the hydraulic fracture conductivity. 

Study on fracturing fluid return pattern and production characteristics of shale gas wells

Microwave-assisted UV/Fenton-like system for the removal of COD from hydroxypropyl guar gum oilfield fracturing wastewater

ABSTRACT This paper studies the treatment effect of microalgae-bacteria consortium on fracturing flowback fluid containing nano-TiO2. The research specifically assessed varying concentrations of nano-TiO2 (0, 5, 15, 30, 60 mg) on biomass production and pollutant degradation during the algae-bacteria consortium's treatment of fracturing flowback fluids. The experimental results demonstrate that the growth of microalgae and bacteria was most favourable in the water sample containing 15 mg of nano-TiO2. After 7 days of incubation, the cell concentration of Chlorella attained 1.04×106 cells/mL, while the bacterial density reached 1.84×106 cells/mL. The presence of nano-TiO2 in wastewater affects the ability of microorganisms to absorb pollutants. Notably, the sample containing 15 mg of nano-TiO2 showed the highest removal of organic matter and ammonia, reaching 46% and 55%, respectively. GRAPHICAL ABSTRACT

Study on the efficacy of microalgae-bacteria consortium on the treatment of nano fracturing fluid.

A review of advanced oxidation process towards organic pollutants and its potential application in fracturing flowback fluid

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A review of advanced oxidation process towards organic pollutants and its potential application in fracturing flowback fluid