The Synthesis Of Fullerene Materials And Their Application In Fracturing Fluid

The acid fracturing technology plays a very important role in the exploration and development of oil and gas field and its key part is the fracturing fluid.Fracturing fluid takes effective part in dispersing pressure from the earth's surface,which can not only open formation to transport propping agent into stratum,but also spread the propping agent in cracks as far as possible,for decreasing filtration of fluid.After transporting the quantitative propping agent,the cracks could discharge a certain amount of fluid.So a whole process of fracturing pumping-in is finished.Fracturing fluid mainly include water-base fracturing fluid,oil-base fracturing fluid,foam fracturing fluid and clean fracturing fluid,etc.So far,hydroxypropyl guar gum(HPG)fracturing fluid is widely utilized in most common oil and gas wells due to its low filtering and excellent viscosity.However,its application in high-temperature and deep wells is hindered because of its poor high-temperature tolerance and shear capacity.In this article,we studied the synthesis of fullerene materials and explored the influence of fullerene materials on high-temperature tolerance and shear capacity of fracturing fluid.First,we successfully prepared fullerene and its water-soluble derivatives.Second,we investigated the application of fullerene materials in fracturing fluid.The radicals induced by high-temperature could destroy molecular link in fracturing fluid,thus leading to the viscosity decrease.To overcome this problem,we proposed adding nano-materials into fracturing fluid to improve the high-temperature tolerance and shear capacity.Fullerene which was called "free radical sponge" could purge radicals to protect HPG molecular being destroyed,hence we increased the viscosity of fracturing fluid and improved its high-temperature tolerance and shear capacity.