caa a22 4500 477049389 CHVBK 20180405111338.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF00242051 doi (NATIONALLICENCE)springer-10.1007/BF00242051 The effect of imposed electrical current on torque release at the metal-mudcake interface [Elektronische Daten] [N. Bonanos, N. Brandon, M. Mahmood, D. Brown] Differential sticking arises in drilling operations when the drillstring embeds into a layer of mud on the borehole wall. The present work is aimed at proving the concept of an unconventional method of releasing the drill string, namely, the application of an electrical current. An instrument has been designed and constructed to measure the slippage torque at the interface between a steel disc and a filtercake prepared from a model aqueous drilling mud. Experiments have demonstrated that a cathodic current of 1 mA cm−2 reduced the slippage torque by about 50% with both mild and stainless steel. The same effect was obtained galvanically, using a magnesium sacrificial anode connected to the steel, thus dispensing with the need for an external power source. It is hoped that this effect could be used to inhibit differential sticking in aqueous drilling muds, as well as offering a fast method of stuck pipe release. Chapman & Hall, 1996 Bonanos N. BP Research Centre, Sunbury-on-Thames, TW16 7LN, Middlesex, Great Britain aut Brandon N. BP Research Centre, Sunbury-on-Thames, TW16 7LN, Middlesex, Great Britain aut Mahmood M. BP Research Centre, Sunbury-on-Thames, TW16 7LN, Middlesex, Great Britain aut Brown D. BP Research Centre, Sunbury-on-Thames, TW16 7LN, Middlesex, Great Britain aut Journal of Applied Electrochemistry Kluwer Academic Publishers 26/9(1996-09-01), 977-980 0021-891X 26:9<977 1996 26 10800 https://doi.org/10.1007/BF00242051 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00242051 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bonanos N. BP Research Centre, Sunbury-on-Thames, TW16 7LN, Middlesex, Great Britain aut NATIONALLICENCE 700 1- Brandon N. BP Research Centre, Sunbury-on-Thames, TW16 7LN, Middlesex, Great Britain aut NATIONALLICENCE 700 1- Mahmood M. BP Research Centre, Sunbury-on-Thames, TW16 7LN, Middlesex, Great Britain aut NATIONALLICENCE 700 1- Brown D. BP Research Centre, Sunbury-on-Thames, TW16 7LN, Middlesex, Great Britain aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 26/9(1996-09-01), 977-980 0021-891X 26:9<977 1996 26 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer