This service is provided by two ranges of complementary equipment: standard and Compact™ tools. Standard tools are based on OD tools greater than 3 3/8 in., with upper limits of 20,000 PSI (137.9 MPa) and 350°F (177°C). Compact equipment is based on the latest technology in 2 ¼-in. sondes, providing unrivaled access and unique methods of conveyance, including memory operations.
The pulsed neutron decay (PND®) – spectrum sensor provides through-casing neutron and density porosity data in addition to standard pulsed neutron measurements. It simultaneously measures conventional capture gamma ray and high-energy inelastic data, providing comprehensive formation evaluation in cased wellbores.
The PND spectrum sensor can log through casing and tubing while maintaining the accuracy of larger tools. Water saturation can be determined from sigma or carbon/oxygen measurements in a single logging pass, which makes the PND spectrum sensor ideal for determining bypassed hydrocarbons.
The multiple-array neutron (MAN) sensor is a compensated thermal and epithermal neutron porosity tool that accurately measures porosity and successfully determines reservoir fluid contacts through casing. Applications include porosity measurement, reservoir fluid contacts, reservoir depletion monitoring, gas cap movement, evaluation of bypassed reserves, and determination of production problems.
The MAN sensor provides accuracy in a broad range of wellbore environments. This including highly-flexible modular design, compensated thermal end epithermal neutron porosity, slim formation density, wellbore fluid density and natural gamma ray.
C-Thru services start with data from Compact open-hole tools run in cased-hole environments. Processing the raw data from Compact dual neutron and, where appropriate, Compact photodensity tools identifies gas, oil and water. The incremental rig time requirement is minimal when data is acquired as part of a Cement Bond Log (CBL) operation. C-Thru tools (including CBL) can operate with or without a wireline. Battery-memory conveyance options include slickline, coiled tubing and drillpipe.
C-Thru services identify and monitor reservoir fluids in casing and production tubing. It does not rely on good cement bond (as do sonic-neutron methods). It has cost and logistical benefits that are relative to pulsed-neutron techniques and is faster and more predictable than through-casing resistivity.