WIRELINE SERVICES

Wireline Geophysical Services

CSG’s Wireline Geophysical Services have 20 years experience in coal, minerals and gas downhole logging. The equipment is state-of-the-art, and maintained/calibrated regularly. In addition to being completely dedicated to CSG’s Coal Seam Gas projects, our logging service has a level of redundancy not found in many competitors’ operations. We always carry additional tools and repair gear to ensure that our units are always functional and ready to operate. This acts to eliminate any possible downtime for rest of the onsite operation.

CSG Services maintain an up-to-date fleet of fully digital, computerised logging systems with a comprehensive suite of tools that provide cost effective dependable and accurate surveys in the subsurface environment for:

• CSG explorations
• Coal explorations
• Mineral deposits
• Groundwater
• Pollution investigations
• Engineering investigations

CSG's primary logging activities are in CSG and coal explorations. However, engineering and environmental investigations can also be carried out at short notice. CSG’s Logging units come complete with extra tools to minimize downtime.

Downhole Tool Suite

9030 - Single Space Density Tool

The 9030 tool contains a single detector, focused density system using a 125-mCi Cesium137 source, to record apparent bulk density of the formation. The tool records natural gamma, caliper, and a short guard resistivity also. This tool is generally used in mineral logging and coal production blast hole logging.

9035 - Density Tool

The 9035 tool contains a two detector, focused density system using a 125-mCi Cesium137 source, to record apparent bulk density of the formation. This tool also records natural gamma, caliper, and a short guard resistivity. This is the standard coal tool that uses the long spaced density in washout zones that can render the short spaced density data inadequate.

9055 - Neutron Tool

The 9055 tool is a multi-parameter slim hole mining and hydrology tool, which contains a single detector, neutron system using a 1.0 Ci, Am241Be source, to record neutron porosity of the formation. This tool also records natural gamma, self potential, single point resistance and borehole deviation (verticality).

9300 - Sonic Tool

The 9300 tool contains a single transmitter and dual receiver to record formation travel times, along with borehole-compensated delta time, calculated sonic porosity, receiver gains, near/far amplitudes. The sonic or acoustic log uses the basic principle of sound waves traveling through a medium and is used extensively for the determination of rock competency. A relative rock strength may be calculated when sonic and density data are manipulated. This sonic system uses a single transmitter and dual receiver system for recording the travel times of the formation. The 9300 receivers are spaced at 0.90 and 1.20 metres from the transmitter.

9320 - Full Wave Form Sonic Tool

The 9320 tool contains a single transmitter and dual receiver to record formation travel times. The full wave form data are also recorded simultaneously, along with near and far travel times, borehole-compensated delta time, calculated sonic porosity, receiver gains, near/far amplitudes and natural gamma. The tool operates at 24kHz and therefore the period is 41.7usec. The sonic, or acoustic, log uses the basic principle of sound waves traveling through a media. The receivers are spaced 0.6m and 0.9m from the transmitter. Therefore, a 0.3m calculation can be made to measure this interval transit time.

9510 - Induction Tool

This three-coil slim hole induction tool is designed to provide conductivity and converted resistivity logs in open boreholes or PVC/plastic cased holes with casing sizes 5cm or greater. The tool measures the rock conductivity in boreholes and wells within a zone of 25 to 125cm from the borehole, but is not sensitive to the borehole fluid, casing, or grouting materials. The tool can also be used in air filled holes to measure the conductivity response. The tool simultaneously records natural gamma ray in API units or CPS for determination of clay content and radioactivity measurements also.

9410 - 4 arm Dipmeter

The 9410 dipmeter is a formation strike and dip direction determination tool primarily used in mining and environmental logging applications. This tool records natural gamma, X-Y calipers, and borehole deviation is computed from the slant angle and bearing measurements calculated from the inclinometer and magnetometer sensors. The X-Y calipers can be used to calculate borehole breakout data for indications of insitu stress directions.

9801 - Acoustic Televiewer 

The 9801 Acoustic Televiewer takes an oriented "picture" of the borehole using high-resolution sound waves. This acoustic picture is displayed in both amplitude and travel time. This information is used to detect bedding planes, fractures, borehole breakout and other borehole anomalies without the need to have a clear fluid filling the boreholes.

The 9801 televiewer digitizes 256 measurements around the borehole at each high-resolution sample interval. This data can be oriented to North and displayed real-time while logging using the Visual Compu-Log System.

Analysis software includes colour adjustment, fracture dip and strike determination, and classification of anomaly. It allows information to be displayed on the graphical screen, plot, and in electronic report formats such as spreadsheets.