| |
|  INTEQ's LithoTrak service provides the industry's most accurate nuclear measurements and formation density images. Real-time azimuthally sectored bulk density and neutron porosity measurements are delivered in a suite designed for integration within rotary steerable drilling systems such as AutoTrak.
The combined suite of neutron porosity and density instruments is available for a wide variety of borehole sizes. Standard suites of 4¾", 6¾" and 8¼" subs are available with a selection of fluid displacers designed to accommodate intermediate bit sizes. The service has been further enhanced by the addition of an 8¼" fleet of subs designed specifically for use in 10 5/8" boreholes.
Four basic petrophysical measurements are made by the suite:- Fully-compensated formation bulk density and high-resolution density image
- Photoelectric cross section
- Acoustic borehole caliper
- Neutron porosity
High Quality Bulk Density
The measurement section of the density sub has been specifically designed to minimize detector standoff and thus provide accurate bulk density values. This, together with proprietary techniques - "managed standoff" and "standoff binning", ensures minimum compensation is required for mud effects. This results in a highly accurate density measurement and a broad operating environment. Density accuracy and precision are further enhanced through the use of larger NaI crystals for both detectors.
High-Resolution Formation Density Image
Having established a high-accuracy, robust density measurement, LithoTrak service also delivers the industry's highest resolution density images. The addition of a magnetometer within the density sub enables azimuthal sectoring of data from 360° around the borehole. Four quadrant densities can be transmitted for real-time wellbore orientation applications with a 16-sector azimuthally oriented image stored in memory allowing for high-confidence structural analysis.
Accurate Borehole Caliper Measurement
True borehole diameter determination is achieved through the use of acoustic standoff modules. Each sensor (ASO) records the acoustic travel time from the sensor to the borehole/formation interface and then back to the sensor. Travel time is converted to distance with the input of mud properties and borehole caliper is derived from the average value of the sensors. With minimized standoff inherent throughout the LithoTrak design, the acoustic caliper is optimized specifically for operation in even the most challenging acoustic environments.
Neutron Porosity
A compensated neutron porosity measurement is made using two advanced lithium6 scintillation detectors in a near and far arrangement. These detectors are highly-efficient, deliver superior statistical precision and are reliable under temperature, shock and vibration. Subwall mounting for both the source and detectors ensures the measurement configuration is positioned close to the borehole wall, thus reducing borehole effects and minimizes the corrections required. The neutron porosity sub can also use the acoustic caliper measurement made by the density sub to further refine the borehole corrections.
Seamless Bottom Hole Assemblies
The design of the LithoTrak service fleet of subs has resulted in improved response, reliability and resistance to wear providing the industry's most accurate nuclear measurements in a wide range of borehole sizes. This design enables the nuclear suite to be combined with the AutoTrak®G3 BHA as well as being fully combinable with additional advanced formation evaluation services including SoundTrakTM and TesTrak®.
|
|
|
| IN-DEPTH CONTENT |
|---|
|
Registered Users, login for more comprehensive content or become a Registered User. |
|
