MWD

Against the odds, what keeps your drilling on target? Robust, flexible equipment that goes the distance with fewer trips. Reliable information and systems that keep progress on track, however extreme the environment becomes. Today's deepwater and hostile drilling environments demand a new type of MWD technology. Re-engineering existing systems to operate at these extreme conditions is not always practical because original system designs and electronic packaging do not easily lend themselves to change. WELLZ^™ Software

Weatherford uses proprietary WELLZ well-planning software to perform survey calculations, allowing users to plan the different sections of a wellbore and select a single parameter to increase or decrease size. Our technical support group oversees all directional drilling projects from initial discussions to planning, execution and post-project analysis. The group also provides:

• Torque-and-drag and hydraulics calculations
• Survey error analysis
• Directional equipment recommendations
• BHA design

WELLZ software also includes anti-collision and ellipse-of-uncertainty calculations.

Hostile Environment Logging (HEL™) MWD System

The HEL system is specifically designed for high-temperature/high-pressure drilling environments and is rated to 356°F (180°C), and 30,000 PSI (206.8 MPa). The HEL system is comprised of individual tools and sensors including the integrated directional sonde (IDS™) assembly, high-temperature azimuthal gamma ray (HAGR™) sensor, the environmental severity measurement (ESM^™) sensor, and the bore/annular pressure (BAP^™) sensor.

The HAGR sensor is an integral part of the HEL MWD system and uses Geiger Muller tubes to obtain real-time azimuthal gamma ray measurements while drilling. The IDS assembly provides directional measurements including inclination, azimuth and toolface. The IDS assembly also provides rapid sliding survey updates for maintaining tight TVD accuracies while geosteering.

The ESM sensor is an integral part of the HEL MWD system and uses a single lateral accelerometer to monitor bottomhole assembly shock and vibration while drilling. An ESM sensor is installed in every HEL system to improve tool reliability. This provides real-time data that alerts drillers when excessive shock or vibration is occurring.

The BAP sensor plays an integral role as well in the HEL MWD system, using highly accurate quartz transducers to monitor downhole well conditions for early indication of drilling problems. It measures bore and annular pressure and downhole temperature while drilling, wiping or tripping out of hole.

EMpulse™ Electromagnetic MWD System

If survey time, connection time or missed surveys are cutting into your profits, the EMpulse electromagnetic MWD system can help. This system does not require drilling fluid to acquire and transmit directional, gamma ray, resistivity and annular-pressure data to the surface.

The EMpulse system saves rig time in five ways:

• Reducing survey time by acquiring and transmitting information in lips with pumps off.
• Allowing data transmission independent of the mud system during underbalanced drilling.
• Providing an uninterrupted data transmission during lost-circulation.
• Creating an unrestricted bore so that there are no limitations on lost- circulation material.
• Eliminating moving parts and enhancing overall system reliability for operation during all phases of drilling operations, including tripping, underbalanced drilling and lost circulation.

These advantages make the tool particularly attractive for use in underbalanced wells, including those drilled with unconventional drilling fluids, such as foam, mist, air or aerated mud.