E. K. Koptelova1, M. F. Nikitina1, S. N. Posadkova2
1All-Russian Research Institute of Starch Products – the branch of the V. M. Gorbatov Federal Science Center of Food Systems of the RAS, ul. Nekrasova, 11, pos. Kraskovo, Lyuberetskii r-n, Moskovskaya obl., 140051, Russian Federation
2Millerovo starch industrial complex, ul. Promyshlennaya, 22, Rostovskaya obl., Millerovo, 346130, Russian Federation
Abstract. The article presents the results of a study on the influence of individual parameters (concentration of solids in starch suspension, the addition of chemicals to the starch suspension before feeding to a roller dryer) of the production of swelling corn starch for drilling on its properties. The concentration of starch solids in the aqueous suspension entering the heated roller dryer ranged from 32% to 42%. As it increased, the physical properties of starch changed, i. e. the film thickness visually increased, swelling in cold water decreased from 15 to 13 cm3/g, viscosity decreased from 42 to 35 mPa s, the solubility of drilling fluid in cold water visually decreased. The introduction of urea into the suspension (1.5% of the starch dry matter) improved the quality of the film produced on roller dryers and reduced the dynamic viscosity of starch from 50 mPa.s to 36 mPa.s. The addition of urea ether (1.5%) obtained in this way into the drilling fluid led to a decrease in filtration through the filter on the VM-6 device to 5–8 cm3. Monostarch phosphate with or without urea reduced the filtration of the drilling fluid from 15 cm3 to 8 cm3. The introduction of sodium trimetaphosphate and adipic acid with concentration from 1% to 5% of starch weight led to the appearance of cross-links between starch macromolecules and significantly changed its properties. This modification increased the viscosity of starch paste (from 15 mPa.s to 30 mPa.s) and its stabilizing properties at elevated temperature (up to 120 C) of drilling fluid. It was recommended to use the processing methods described in the production of new types of starch reagents for stabilizing the drilling fluids during the drilling of oil and gas wells, even at a temperature of 120 C when other reagents are ineffective.
Keywords: drilling; swelling starch; cross-linked starch; starch reagent; drilling fluids; heat resistance; filtration; stabilization.
Author Details: E. K. Koptelova, Cand. Sc. (Tech.), leading research fellow (e-mail: vniik@arrisp.ru); M. F. Nikitina, research fellow; S. N. Posadkova, chief technologist.
For citation: Koptelova E.K., Nikitina M. F., Posadkova S. N. Effect of Moisture and Temperature Action and Chemical Agents on the Properties of Swelling Starch for Drilling. Dostizheniya nauki i tekhniki APK. 2019. Vol. 33. No. 8. Pp. 81–84 (in Russ.). DOI: 10.24411/0235-2451-2019-10818.