Study of lubricant additives to the drilling fluid for reducing the friction coefficient during well construction with rotary steerable system

UDK: 622.245.422.4

Key words: rotary steerable system, drilling fluid, lubricant additive, friction coefficient

Authors: A.A. Melekhin, S.E. Chernyshov (Perm National Research Polytechnic University, RF, Perm), P.A. Blinov, M.V. Nutskova (Saint-Petersburg Mining University, RF, Saint-Petersburg)

During the construction of controlled directional wells and wells with horizontal ending, especially with using modern rotary steerable system (RSS), there is a key problem in the values mismatch of actual and design loads on the bit, and increased wear of drill string`s couplings during drilling and round-trip operations.

The article describes the study of lubricant additives to drilling fluids. The study was conducted on the lubricity tester Fann EP/Lubricity Tester Model 212, device for determining the coefficient of mud cake KTK-2, rotary viscometer Fann 35SA, pH-meter Crison GLP 21. Studies were conducted with reagents Lubristeel, FRW A, FRW B, FRW, Lubrital, PolyMudLiquid, ASP 820. Reagents FRW, FRW A and FRW B are the new developments of Perm National Research Polytechnic University.

Based on the obtained data analysis the lubricant additive FRW of various modifications showed results comparable to currently used reagents: reducing the friction coefficient of pair "metal – metal" in clay solution was 70-75% in aqueous solution – up to 65%. Preparation of the solution causes no difficulties, no foaming is observed, reagents do not change the solution`s pH, lubricity additives cause no changes in the mud rheology. The optimum concentration of lubricant additive FRW according to the study of friction coefficient reducing in different media was about 1.5-2%. Thus, to reduce the friction coefficient and wear of the drill string during the construction of controlled directional and horizontal wells using rotary controllable systems we can recommend to use the lubricant additive FRW in various modifications.
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