ThruBit: Through the Bit Logging Solutions | Schlumberger

ThruBit

Through-the-bit logging services

Full wireline measurement suite for logging geometrically complex and unstable wells

ThruBit through-the-bit logging services provide a unique conveyance platform for a set of nine slim formation evaluation tools to efficiently log difficult-to-access wells.

No longer are operators limited to time-consuming specialty conveyance or forgoing logging completely. A logging string comprising any number of the ThruBit services measurement tools can be conveyed through the drillstring and Portal pass-through bit to log the open borehole on wireline or as the drillpipe is tripped out of the hole.

ThruBit Through-the-Bit Logging Services in the field

The presence of drillpipe in the well protects both the toolstring and borehole integrity, with the driller maintaining complete control.

How it works: Logging beyond gravitational descent

Eliminate additional trips and save rig time by deploying the toolstring and logging during hole conditioning.

1. The Portal pass-through bit is used to ream to TD to prepare the borehole for logging.
2. The driller pulls the bit off bottom to provide room for the logging toolstring, which is pumped through the drillpipe.
3. The toolstring is pushed through the Portal bit opening into the open borehole, where functionality is verified, and then the wireline is disconnected and removed from the drillpipe.
4. Logging in memory mode occurs as the pipe is tripped out of the hole.
5. Once logging is complete, the Portal bit at the end of the drillpipe and toolstring are pulled up into the casing.
6. A retrieval tool is lowered on wireline to latch onto the toolstring and return it to surface.
7. With the logging toolstring recovered from the drillpipe, drilling or other operations can resume while the logging data is reviewed.

ThruBit How It Works
ThruBit services tools

Slim, multiconveyance logging portfolio

ThruBit services formation evaluation tools provide a complete set of logging measurements packaged in a small diameter of 2 1/8 in. The measurements range from the classic triple- and quad-combo suites through advanced high-resolution laterolog, spectral gamma ray, dipole sonic, and borehole imaging.

Deployed in any combination, the ThurBit services tools meet your needs in slim holes and difficult borehole configurations and conditions.

ThruBit services triple-combo
This workhorse logging suite comprises neutron, density, and array induction resistivity in combination with the telemetry, memory, and gamma ray device run with all ThruBit services tools.
ThruBit HRLA high-resolution laterolog array tool
Measurement by focused arrays at multiple depths of investigation enables determining and correcting for environment effects, such as shoulder beds, and calculating uninvaded formation resistivity.
ThruBit services waveform sonic tool
Monopole-acquired waveforms are processed to provide foundational compressional and shear velocities.
ThruBit services spectral gamma ray
Measurement of the total gamma ray spectra enables resolution into potassium, thorium, and uranium, which are common in sands and shales.
ThruBit Dipole through-the-bit acoustic service
Both monopole and cross-dipole waveforms and Stoneley waves are acquired for determining whether the formation is isotropic or anisotropic, which is critical information for designing well paths, completions, and fracturing stages.
ThruBit FMI through-the-bit formation microimager
Imaging and dip data providing 80% borehole coverage in 6-in hole with 0.2-in image resolution provides high-resolution structural, stratigraphic, and geomechanical understanding.
ThruBIT Dipole | Robin Slocombe
ThruBit Dipole through-the-bit acoustic service enables sonic logging in horizontal wells for a full 3D mechanical properties log.
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