вЃ Water-based systems which are traditionally used worldwide occur as clay suspensions stabilized by anionic-nonionic polymers. For many scientists the improvement of this systems basically means substitution of one component to another or proportion variation of reactants and for a long time it was too hard to develop highly effective drilling fluid systems by using of such improvement methods.
With a new approach to a problem, specialists of Gazprom VNIIGAZ LLC were able to develop new drilling fluid systems named Catburr. These systems were already used in (construction) drilling of wells No. 939 and 1082 on the Astrakhanskoye gas-condensate field in comparison with traditional drilling muds, Catburr has many advantages such as high inhibiting and fastening properties; simplicity of preparing and regulation of properties while drilling, back of depending of structural, rheological and filtration properties on the pH; high thermal, salt, hydrogen sulfide; carbon dioxide and enzymatic resistance; compatibility of freshwater and saltwater systems; small number of components. But despite positive results of Catburr use, there was identified shortcoming such as complexity in regulation of structural-rheological properties.
In other to solve this problem we conducted many lab and field tests, trying a wide range of structurants and its various combinations. According to research it is found that application of biopolymer and hydroxides of magnesium and aluminium helps to eliminate appeared shortcoming and allows to regulate Catburr properties much more effectually.
The received results indicate a need for further research of polycathionic systems and its various modifications that should be probated drilling subsequent wells.
1. Gaydarov A.M., Some aspects drilling mud use (In Russ.), Stroitel'stvo neftyanykh i gazovykh skvazhin na sushe i na more, 2016, no. 5, pp. 36–39.
2. Glinka N.L., Obshchaya khimiya (General chemistry): edited by Rabinovich V.A., Leningrad: Khimiya Publ., 1981, 720 p.
3. Angelopulo O.K., Podgornov V.M., Avakov V.E., Burovye rastvory dlyaoslozhnennykh usloviy (Drilling fluids for complicated conditions), Moscow: Nedra Publ., 1988, 135 p.
4. Angelopulo O.K., Khakhaev B.N., Sidorov N.A., Burovye rastvory, ispol'zuemye pri razburivanii solevykh otlozheniy v glubokikh skvazhinakh (Drilling fluids used to drill salt deposits in deep wells), Moscow: Publ. of VNIIOENG 1978, 71 p.