Design and research of clean gel fracturing fluid for medium and low temperature wells

Abstract:

Since bedrock water well fracturing technology was developed， it has achieved good stimulation effect， but there are still some problems such as poor adaptability and uncertainty in stimulation performance. Based on the analysis results of the factors influencing the fluid flow pattern and the fracture width in fracturing stimulation， it is determined that increasing the viscosity of fracturing fluid is a more economic and effective stimulation technical measure. The design of clean gel fracturing fluid formulations for water wells and middle and low temperature geothermal wells has been carried out； and the thickener， pH regulator， crosslinking agent and gel breaker have been selected and tested. A clean gel fracturing fluid system suitable for water wells and medium and low temperature geothermal wells （30 to 80℃） has been developed and field tested. Analysis is conducted of the application difficulties and cost of gel fracturing fluid， which supplements the research on fracturing technology for water well fracturing stimulation.