Mud Logging Unit ALS-2

II. UNIT ALS-2 MUD LOGGING:

1. Introduction:

The ALS-2 Mud Logging Unit provides highly automated monitoring of the entire drilling operation. More than 70 parameters can be measured, processed, displayed, printed and recorded simultaneously. The acquisition system also calibrates the received signals and checks the state of the sensors for electrical faults such as a cut cable or open circuit. In the case of malfunction, an alarm is activated immediately alerting the operator.

For data processing a totally new concept has been adopted based entirely on computer technology. The sensor signals are transformed into digital format and then distributed according to requirement. The data is supplied on screen monitors (two types of screen system exist, the “Alpha-numeric” and the “Graphic”) or intelligent interfaces in real-time or playback mode. Alarms can be placed on each parameter. Computerized printouts of desired parameters produce graphic charts of the progress of the well being drilled. In addition the database is continually recorded on magnetic storage support.

The ALS is a powerful tool that may be placed in the hands of those with responsibility for the drilling rig. Using many forms of data presentation in the logging unit, monitors or intelligent interfaces can be placed anywhere on the rig. These terminals are “operator friendly” and enable anybody who needs information to have it right there in front of him in real-time or replay mode, and to apply analysis programs if necessary.

Off-line processing: An offline workstation is part of the ALS-2. This workstation has the following main functions:

Calibration of the sensors.
Off-line calculations:

- Overpressure

- Hydraulics (Bingham, Power Law and other models)

- Deviation survey analysis

- Surge & Swab

- Drilling bit optimization

- Bit performance and cost

- Kick control

- Gas ratio analysis + plots

Data handling (graphic playback, log processing, import/export...)
Diagnostic functions and network management.
Reporting capabilities (word processing, graphics editor...)

2. Mudlogging equipment and services:

2.1 Mudlogging Unit:

Mudllogging unit for offshore operation, complete with:

Air-condition System
Working area for client
Full UPS System to support all computers and data acquisition system
Airlock/Escape Hatch/MCT Entry
Pressurization system
Safety Equipment
Intercom system

2.2 Formation evaluation equipment:

Binocular Zoom (10 x 30) microscope
UV Fluoroscope
Sample Drying Oven
Geological Equipment and Chemicals
Sample Processing Trays
Shale Density
Autocancimeter

2.3 Gas detection system:

The FID (Flame Ionization Detector) Gas Detector & Chromatograph is a well site gas detection and analysis system. It continuously analyses gases extracted from the degasser.

Measurement of total hydrocarbon gases in methane equivalents, with:
Measuring range: 250 ppm -100 %
Sensitivity: 200 ppm
Accuracy: 100 ppm
Calibration method: Manual

Automatic chromatographic analysis of gas components (from C1 to nC5 measured in 240 seconds), with:
Measuring range: 30 ppm -100 %
Sensitivity: 20 ppm
Accuracy: 10 ppm
Calibration method: Manual injection.

2.4 Sensors and parameters:

Continuous analog recording on colour recorders and digital display on colour monitor of:

Drilling rate, heave, depth, bit depth, TV depth, kelly height, hook height, footage, bit run, time on bit
Weight on bit, hook load and over pull
Individual pit volume and Totaliser (all active pits, trip tank and other pits)
Pump rate and Totaliser (Flow in pumps), Lag time
Standpipe Pressure, Well Head Pressure, Cement Unit Pressure
Rotary RPM and Rev counter
Mud temperature In/Out
Rotary Torque
Mud Flow Out
H₂, H₂S, CO₂