Cooling Effect of Fracturing Liquid on Fractured Reservoir

Abstract

It is well known that hydraulic fracturing is the main method for the exploration and development of complex and tight oil and gas reservoirs. Pre-fracturing liquid in hydraulic fracturing not only have the function of making cracks, but also have the cooling effect that not allowed to ignore especially in the high temperature of reservoir. In order to deal with the new problem of high temperature of fracturing liquid due to the increase of reservoirs depth, It is necessary to develop a high temperature resistant fracturing liquid system on the one hand, and study the cooling technology of fracturing liquid on the other hand. At the same time, as the existence of natural fractures is an important condition for complex fracture networks in reservoirs, fractured reservoirs play an increasingly important role. Consequently, it is very important to study the cooling effect of fracturing liquid on deeper and deeper fractured reservoirs. In this paper, we simulate the temperature field of liquid flow in hydraulic fracturing fractures by using CFD liquid dynamics software. The conclusions are as follows: (1) The more natural fractures there are, the larger the rock area will be, the faster the thermal convection will be, and the better the reservoir cooling effect of the preconditioning liquid will be; (2) The wider the natural fracture width is, the larger the rock area is, the faster the thermal convection is, and the better the reservoir cooling effect of the preconditioning liquid is; (3) from the perspective of cooling deep fractured carbonate reservoir in hydraulic fracturing pre-flush rate and dosage, deep fractured reservoir fracturing, should be with high viscosity front hydraulic open cracks of a certain size, as far as possible communicate more wider natural fracture, injected low viscosity pre-flush rapid cooling, is conducive to maximizing pre-flush seam and cooling effect. The optimal preconditioning liquid dosage is 300 m³ to 400 m³, and the construction displacement is 5 m³/min to 7 m³/min.

Copyright 2022, IFEDC Organizing Committee.

This paper was prepared for presentation at the 2022 International Field Exploration and Development Conference in Xi’an, China, 16-18 November 2022.

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