Traditional freshwater and saltwater weighted drilling fluids are vulnerable under the influence of various aggressive factors that cause different complications. Historically, domestic and foreign fluids with water dispersion medium are the argillaceous suspensions, stabilized with anionic and non-ionic polymers.
Specialists of Gazprom VNIIGAZ LLC have developed an improved method for preparation of cationic drilling fluids called Katburr, which are more effective than all existing anionic-nonionic systems. Katburr has many advantages, such as high inhibiting and strengthening properties, low-component composition, simplicity of preparation and control of its characteristics, lack of dependence of technological properties on pH, high resistance to thermal, saline, carbonic acid, hydrogen sulfide and enzymatic aggressions, compatibility of freshwater and saltwater systems.
One of Katburr modifications was used to drill well № 939 on the Astrakhan gas condensate field. It was found that salt doesn’t affect Katburr properties – they remain stable, filtration rate of the fluid lowered to 0 because of positive effect of halite, anhydrites and gypsum on properties. No chemical treatments were made during the drilling, so it allowed to reduce the consumption of reagents considerably. The economic effect was garnered.
Results indicate the possibilities and necessity of expanding the use of cationic drilling fluids during construction of wells under various complex geological and technical conditions. The plan of the near future is a mass using of improved Katburr modifications during drilling of operational wells in the post-salt and salt sediments on the Astrakhan gas-condensate field.
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