PERFORMANCE EVALUATION AND FIELD APPLICATIONS OF A REVERSIBLE LOW DAMAGE CLEAN FRACTURING FLUID

With the development of low permeability reservoirs,the fracturing is becoming an important increase production means. Based on the China Oil and Gas Industry Standard SY / T 5107- 2005Water- based fracturing fluid performance evaluation methods ,the temperature resistance,resistant to shear properties,salt tolerance,and gel breaking properties of a new fracturing fluid thickener were evaluated. Experimental results showed that the viscosity of fracturing fluid thickener is more than 50 mP a. s after shearing continuously 90 minutes at100℃ and 170 s- 1,and zero residue and the surface tension of the break gel fluid under 80 ℃ is 25. 87 mN / m,etc. The thickener was successfully used in 8 wells and the good increase production effect was obtained. Field application results showed that the fracturing fluid thickener had good temperature resistance performance and sand- carrying capability,low surface tension and interfacial tension,low damage to reservoir. It has wide application value in the low permeability reservoir fracturing.