The Remote-Controlled, Multiangle Bent Sub for Drilling Trajectory Control and Corrections
- J.G. Boulet (SMF Intl.) | P.E. Morin (Inst. Francais du Petrole)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling Engineering
- Publication Date
- October 1986
- Document Type
- Journal Paper
- 390 - 394
- 1986. Society of Petroleum Engineers
- 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.14 Casing and Cementing, 1.6 Drilling Operations, 1.5.1 Surveying and survey programs, 1.10 Drilling Equipment, 1.6.6 Directional Drilling, 1.6.2 Technical Limit Drilling, 4.1.6 Compressors, Engines and Turbines, 1.6.1 Drilling Operation Management, 1.12.1 Measurement While Drilling
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A downhole, adjustable, multiangle bent sub, called Telepilote, has been developed for remote control of the wellbore path on a real-time basis without changing the general bottomhole assembly (BHA) configuration. Different modes of actuation for changing the bent sub correspond to different types of construction. The tool is available in 6 3/4-, 7 3/4-, 8-, and 9 1/2-in. [17.1-, 19.7-, 20.3-, and 24.1-cm] nominal sizes. It can be set at six positions, from zero (or straight position) to a maximum angle position of 2 deg. 2 deg.30', or 3 deg. according to nominal sizes. The main construction features and different drilling applications are presented. In addition, the T-3000 Telepilote is described, which features the Telehydrocom (THD) actuator system. This system makes an immediate, direct hookup in the drillstring between the sub and all survey instruments, including measurement-while-drilling (MWD) systems, possible.
Worldwide application of directional drilling methods proves that drilling the complete trajectory of a given hole proves that drilling the complete trajectory of a given hole size requires BHA changes. These can be achieved in either rotary drilling or downhole motor drilling with fixed-angle bent subs for controlling and correcting the two basic complementary directional parameters: drift angle and azimuth. Accurate controls and corrections of azimuth are impossible in rotary drilling, while methods with downhole motor and fixed-angle bent subs do not permit the optimization of the drift angle for the hole permit the optimization of the drift angle for the hole profile. Therefore, the application of a downhole deviation profile. Therefore, the application of a downhole deviation tool that is adjustable from the surface makes directional drilling more efficient, saves time, and is more accurate. Such equipment will extend current standard methods for directional control.
The Telepilote is associated with a turbine in a downhole motor. It allows drilling of the complete buildup zone and of the constant-drift-angle zone with the same BHA by a modification of only the multiangle-bent-sub angle from the surface. Thus the need of a round trip either to install an angle sub for the kickoff or to change the BHA is eliminated. A wide variety of applications are foreseeable because of the remotely controlled variable configuration from surface, which can respond to a large variety of worldwide drilling programs and formations with accuracy and efficiency.
|File Size||274 KB||Number of Pages||5|