Real-Time Direction & Toolface Measurements
SURVIVOR high-pressure, high-temperature (HPHT) MWD tools provide direction and toolface measurements in real time for steering the borehole, and can operate in temperatures up to 350 degF [175 degC] and pressures up to 25,000 psi. An optional gamma ray sensor—with a proven scintillation crystal design and full API calibration—can be added at the wellsite for formation correlation.
HDS-1L directional tool
SURVIVOR HDS-1L HPHT directional tool uses a highly accurate sensor to measure direction and toolface, together with a positive-pulse transmission system that sends computed surveys or raw data to surface. Continuous readings of inclination and azimuth are also available. The HDS-1L tool communicates with LWD tools in the string via the DataLink MWD real-time communication platform. The tool is inserted into the collar at the rig site.
HDS-1R retrievable directional tool
For directional and horizontal applications with high dogleg severity (DLS), SURVIVOR HDS-1R HPHT retrievable directional tool uses a proprietary wireline-retrievable and -reinsertable MWD system, capable of operating in drilling assemblies from 3 1/8-in to 9 1/2-in OD. The tool provides measurements with the same level of accuracy and reliability as the SURVIVOR HDS-1L tool. The entire assembly has a 1 7/8-in diameter, which provides the added benefit of tool retrievability through IDs as small as 2 1/8 in, minimizing lost-in-hole exposure.
HDS-1G gravity-based, magnetic interference–free survey tool
SURVIVOR HDS-1G HPHT gravity-based, magnetic interference–free survey tool uses proven SURVIVOR HDS-1 technology with two modular MWD sensors to calculate azimuth in hostile drilling environments where magnetic interference prevents the use of a conventional MWD survey (e.g., geothermal wells with high magnetism, drilling out of a casing window, kicking off immediately out of the casing shoe, or drilling a relief well). The dual MWD accelerometer package measures tool (or BHA) bending and calculates the difference in azimuth. This is tied into the reference survey, providing an accurate azimuth or direction. Inclination is calculated in the standard way—a full directional survey is thus available.
Insensitivity to movement during the survey allows the tool to be used when gyro surveying is problematic. Once the gravity MWD tool is clear of the effects of magnetic interference, it can be reprogrammed to use the magnetometer sensors and operate as a conventional MWD tool without pulling out of the hole.
Annulus and internal pipe pressure and temperature.
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