Cased-Hole Logging

Determination of the wellbore production profile of hydrocarbons and water and the analysis of selective inflow performance.

Determination of the depths and rates of injected fluid uptake into the reservoir to confirm all zones are taking fluid.

Identification of gas, oil and water and their contacts.

Cross-flows can occur due to leaky casing, poor cement or differential pressures in different reservoir units. Cross-flow can severely impair well and potentially reservoir performance. Cross-flow can be identified from spinner-temperature curves in shut-in production logging tool passes and station-stops.

Identification of leakage in tubing, completion and downhole equipment (e.g. gas lift mandrels). A production logging toolstring may be run with a multi-finger caliper to locate and define potential leaks.

In many wells, but particularly in later well life, water breakthrough reduces production efficiency and can lead to topside water handling problems.  Correct identification of the depth distribution and rates of water inflows allow the selection of appropriate water shut-off strategies to improve well performance.

Horizontal and highly deviated wells require measurement of hold-up and velocity over the wellbore cross-section due to phase separation and variable velocities. This is achieved using an array tools with spinner, resistance and capacitance sensors arranged around the wellbore.  For gas, the gas hold-up tool (GHT) also provides an across-the-wellbore measurement of water/gas hold-up.

Depth control is critical to all logging operations.  We combine tools (e.g. CCL & gamma ray) with a clear Operating Procedure and quality control to ensure that our data and services are supplied with accurate depth.

Analysis of production logging tool data undertaken by specialists using industry standard software. Deliverables include log quality assessment, tabulated zone and cumulative flow rates for each phase, and a concise illustrated report with raw and interpreted shut-in, flowing and station data. Rapid turnaround processing support informs critical client decision-making for production enhancement.

Evaluation of Top of Cement (TOC), cement-to-pipe and cement-to-formation bond for zonal isolation analysis.  Identification of behind-pipe channelling including orientation in deviated wells.  Critical for well abandonment as well as production optimization.

Quantitative measurement of corrosion pitting, wear and metal loss in tubing or casing is vital in the assessment of well integrity. These results may be combined with magnetic thickness measurements of the pipe.

The measurement and characterisation of scale build-up that can reduce well performance and impede well intervention access to inform scale squeezing or milling operations and to identify Naturally Occurring Radioactive Mineral (NORM) scale.

Repeat, periodic multifinger caliper logging that evaluates the rates of corrosion or scale buildup over a defined period.

Properly designed multi-finger caliper surveys can identify and characterise deformed or buckled pipe.  This is quite a common occurrence in production liner in North Sea HPHT fields and where pipe passes through salt formations.  Post-processing analysis can determine the style (fault offset, helical buckling etc.) and quantify the deformation.

Pipe thickness may be measured ultrasonically or with a Pulsed Eddy Current (PEC) magnetic thickness tool. These techniques can identify corrosion-related metal loss on both the inside and outside of the pipe.  

Pulsed Eddy Current (PEC) magnetic thickness measurement of up to three strings of pipe (for example, tubing and two casing strings). This technique can identify corrosion-related metal loss on both the inside and outside of the pipe.

Identification of leaks in tubing, completion and downhole equipment (e.g. gas lift mandrels). PLT string may be run with multi-finger caliper to pinpoint leaks.  In certain situations, a ‘noise tool’ may be beneficial and we can provide this through our partnered technology services.

A continuous video log generated by a camera that has been deployed downhole is used to detect tubing anomalies, identify fish and other defects that may inhibit production.

Depth control is critical to all logging operations.  We combine tools (e.g. CCL & gamma ray) with a clear Operating Procedure and quality control to ensure that our data and services are supplied with accurate depth.

The analysis of multi-finger caliper data is performed using industry standard software (MIPS). Data includes a tabulated statistical analysis of tubing, a concise illustrated report and a digital client data viewer with 3D capability. This data and constant support from Altus Intervention informs critical decision making for production enhancement. PLT leak detection and magnetic thickness measurements can be fully integrated with multi-finger caliper and magnetic thickness data for optimum interpretation. 24/7 support to inform critical decision making for production enhancement.

Reservoir saturation monitoring is performed at the near-wellbore formation using Sigma and/or Carbon-Oxygen logging, to determine porosity and hydrocarbon saturation measurements.

Pressure and temperature profiling for well surveillance.  Setting, recovering and reading gauges (and hangers) for long-term monitoring.

Depth control is critical to all logging operations.  We combine tools (e.g. CCL & gamma ray) with a clear Operating Procedure and quality control to ensure that our data and services are supplied with accurate depth.

Pre-job modelling (which requires our clients’ petrophysical input) and a comprehensive post-processing analysis of saturation logs is undertaken.