Study of an information transmission channel in drill pipes during wells construction using rotary steerable system

UDK: 622.243.56

Key words: well, rotary steerable system, data transmission channel, drill pipes

Authors: N.I. Krysin, A.A. Melekhin, I.V. Dombrovsky, D.Yu. Rusinov (Perm National Research Polytechnic University, RF, Perm), V.V. Nekrasov (SKB CJSC, RF, Perm), M.V. Vedel (Motovilikha Plants PJSC, RF, Perm)

Currently, rotary steerable systems (RSS) are increasingly being used when drilling wells of a complex profile to allow a controlled wellbore`s curvature with a given intensity while continuously rotating the drill string. To create an uninterruptible communication channel between bottomhole and wellhead specialists of Perm National Research Polytechnic University, SKB CJSC and Motovilikha Plants PJSC are developing a complete high-speed communication channel using the cable in the walls of the drill pipe. Cable routing in the body of the drill pipe is performed in the outer longitudinal groove with a protective polymeric compound. It was decided to use an inductive method for transmitting a digital signal through a threaded connection. The advantage of this solution is that during assembly of the drill string does not require additional actions for the electrical drill pipe`s cable docking. Screwed drill pipes automatically create a digital network. It is offered to place compact inductive coils connected by a cable with a small-sized electronic unit at both ends of each drill pipe in the area of threads. In the body of the drill pipe a pocket with a removable cover is performed for placing an electronic module and a battery. As the key electronic component a chip LT6820 (Linear Technology) is chosen, designed to organize digital networks with inductive isolators (contactless data transfer). Coils reeled up with wires PETV-2 0.2, GF 0.35 and litzendraht of 5 PETV-2 0.2. wires were tested. To determine a coupling coefficient between coils the inductance of each coil was measured. The resistance of wire coils was measured to direct current. Waveforms of the test pulse transmission with width of 40 and 120 ns were recorded. Paired pulses of different polarity and rectangular form were feed through a current limiter of 20 mA. The studies found that the number of coil turns between 7 and 9 is sufficient to obtain the desired shape of the output pulse with a duration and intensity of the incoming pulse 40 and 120 ns. The use of this data transmission method allow to create an uninterruptible two-way communication channel between bottomhole and wellhead in the complex profile well`s construction using rotary steerable systems, to transfer the entire data volume received from downhole systems without time delay and to control the well trajectory in manual mode.
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