Study Of The Guanidine Fracturing Fluid System With Low Concentration

Fracturing technology is an important exploration tool in low-permeability oil and gas field. Fracturing fluid is a major component of fracturing technology which has several functions: conducting ground pressure, formatting cracks in the strata, carrying proppant to make it spread in the cracks; reducing the filtration of external liquid in the layers. The fracturing process of injection with pump is complete when the proppant which the volume is designed, is transported through the fracturing fluid, then replaced a certain volume of fluid. After removal of external pumping pressure, the cracks which have been stuffed by the proppant are started to close. The artificial support cracks which include proppant, fracturing fluid gel and fracturing fluid cake can form. Thus, high-conductive supporting cracks can be finally got. The main factors which affect supporting cracks conductive ability include the capability of proppant, volume and the high-concentrated fracturing fluid gel which have been full of cracks. They demand to be dealt with by gel breaker.In order to minimize the damage of flow conductivity made by supporting cracks from spacer gel, we should strengthen the modification of performance of guar gum grafting on the basis of gel breaker which is efficient and spread out equably. In this paper, a new generation of CMHPG containing oil-wet radical have been researched. The working concentration of this type of CMHPG is lower than that used in ordinary fracturing fluid by 20% to 50%, then reduce the quantity of spacer gel in the crack, so decrease the damage of supporting crack.Thickening agents properties and compatibility of the low concentration of fracturing fluid were studied in this paper. The results showed that JK1002 had good heat resistance and crosslinking performance, and the choosed agents such as clay stabilizer, cleanup additive demulsification, gel stabilizers and pH agents had better compatibility with JK1002. Through the performance evaluation of the medium temperature, high temperature low concentration of fracturing fluid system formulations, the results showed that the medium temperature, high temperature and low concentration of fracturing fluid system formulations had good rheological properties, gel-breaking performance and portability sand properties.