Mud logging - Datalog - Innovative Formation Evaluation Solutions

By: Datalog Technology  09-12-2011
Keywords: Gas, Drilling

The Mud Logging unit is a proven design developed as the result of more than 40 years experience with unit engineering, manufacturing and maintenance. Every feature from the rugged corrugated shell to the ergonomic interior is well thought out to provide a rugged, safe and comfortable working environment.

  • Rugged skid mounted construction.

  • Intrinsically safe electrical system.

  • Choice of main power voltage and frequencies.

  • UPS backup.

  • Pressurized and explosion proof with automatic power shutdown.

  • Interior combustible gas alarm.

  • Interior emergency lighting system.

  • Escape hatch.

  • Dual air conditioning units.

  • convenient spacious interior including engineer workstation, geologist work area, sample preparation area, and work area for company geologist.

  • Ample storage space.

  Standard Onshore Offshore Heli-Lift
Length: 27 Feet 24 Feet 24 Feet 20 Feet
Width: 8 Feet 8 Feet 9 Feet 8 Feet
Height: 8.5 Feet 9 Feet 8.7 Feet 8.5 Feet
(fully loaded)
10 Metric Tons 13 Metric Tons 13.78 Metric Tons  5.37 Metric Tons

The Mud Logging unit interior is designed with close attention to detail and several advanced features to ensure an optimal working environment. Standing inside the unit gives the impression that the unit is much larger than its true physical dimensions. Counter and storage space is plentiful and supplies are always easily accessible.

The sample preparation area is large enough to perform all sample related procedures from washing and drying the sample to autocalcimetry analysis. Chemicals, trays, glassware and other sample related items are stored in this area. The geologist work area is to the left of the sample preparation area and includes a computer station for updating the log and running offline programs.

This area is reserved for the company geologist. It includes counter and wall space, ample leg room, storage drawers, electrical outlets and network connection ports. A data display monitor is placed in this area.

The ANAX 500 is the central data collection system for Datalog ’s Mud Logging Unit. It combines the real time information management of Datalog ’s WellWizard software with superior data compilation. The combined technologies enable drilling operations to optimize performance and improve economics.


The ANAX 500 is ideal for offshore rigs as it provides high speed data acquisition with improved resolution and sensitivity. It provides all the data you need for drilling optimization and hydraulic analysis.


The ANAX 500 is a premium rack mounted unit that is easy to use, learn and maintain. It is a full feature unit with complete geologic capabilities. Get the data you want, when you want it. The ANAX 500 is capable and robust handling TVD, Multiple Wells, Import/Export and much more!


The ANAX 500 is highly secure and offers enhanced hard drive function. It saves all main parameters in a MySQL database, with both time and depth based records being stored. Additional databases are used to store information such as bottomhole assembly, drill string, pipe tally and directional survey data. Use these databases to investigate occurrences on the rig or comparisons between wells to optimize drilling rates. The ANAX 500 is an expandable system with 40 standard channels and up to 64 analog sensor inputs. The Anax 500.

Summary of Features

  • Full support of Spanish, Chinese, Russian

  • Unlimited casing, hole and pipe profiling

  • Intuitive pipe tally/BHA application

  • Multiple well access

  • Configurable displays

  • Import/Export compatible

  • Trip Monitor

  • Calcimetry

  • Versatile trend analysis

  • Vibration Monitoring

The ANAX 500 System Basics

Central Processing Unit

The CPU offers eight channel serial, dual hard drive RAID with pluggable hard disk carriers. It is a highly reliable unit with a Unix based operating system.

Depth Processing Unit

The DPU is a self contained depth system comprising sensors, barriers and a processor, generating depth based calculations. The system measures block movement, hookload, together with drilling and heave compensation in order to generate depth and penetration parameters. Block movement is typically measured with a draw-works optical position encoder although a crown sheave proximity sensor is optionally available.

Data Aquisition Unit

The DAU’s modular computer interface signal conditioning boards (electronic barriers) are easily customized for any project. A single main cable interconnects between the DAU and CPU, dramatically simplifies installation.

Total Gas Detection

  • WITS output

  • Stabilized flow

  • Microprocessor controlled detector

  • Intuitive onboard calibration process

  • Enhanced stability, accuracy and resolution

High Speed Chromatograph

Hydrocarbon shows are often missed or poorly evaluated due to sampling and analysis speed limitations of most conventional chromatographs. Datalog ’s High Speed Chromatograph is configured to analyze C1 to C5 in 30 seconds. This chromatograph samples gases such as H 2S, CO2 and a variety of inert gases without additional equipment.

Contigency Plan

Datalog’s ANAX 500 system has redundancy built in with two independent hard drives. The primary hard drive runs the system and the secondary mirrors the primary for the continual back up of all data. The offshore ANAX 500 system also provides a second CPU unit for redundancy and added protection.


CPU Unit

  • Rack mounted
  • 8 channel serial
  • dual hard drive RAID, ATX


  • Commell HS862 single board computer
  • ATA100, dual IDE channels, PC104 interface
  • Processor - Intel 186 MHz P3 with 1Gb
  • L2 cache Memory - 512 Mb SODIMM module
  • CE certified ATX power supply
  • 2 hard drives -3.5” ATA100+100Gb

DAU Unit

  • Wall mounted (rack mount optional)
  • Clear plexi cover fitted

Wall Mounted unit

  • 32 ANA and 8 DIG channels
  • 2 units can be daisy chained to provide 64 ANA

Rack Mounted Unit

  • 16 Analog and 8 Digital channels

Mud Logging provides subsurface geological information while drilling a well.

Mud Logging examines and analyzes geological information contained in formation cuttings and drilling mud, to determine if oil and gas are encountered during well drilling. Mud Logging also provides critical safety functions such as determining pore pressure, kick control and ambient gas monitoring. Mud Logging is used while drilling most exploratory and many development wells, both on and off shore.

Mud Logging services range from basic unmanned gas detection to sophisticated full serviced, manned operations. Services have evolved to become the information centre for the well and include electronic monitoring of drilling parameters. These parameters include weight on bit, torque, penetration rate, mud levels, pump speed and third party service provider data.

Basic unmanned services use a cost effective Mud Logging unit that provides simple gas detection to identify potentially productive pay zones and enhance drilling safety. The system is configurable for hydrogen sulphide Hs2 monitoring . The units are equipped with alarms to alert the user if gas increases or equipment problems occur and works in conjunction with data Logging and drilling penetration rates.

Mud Logging Services provides:

  • Advanced drilling monitoring systems capable of gas detection, electronic monitoring and database recording for a full range of drilling parameters on manned or unmanned operations.

  • Experienced crews and additional tools to monitor and analyze both the geology of the subsurface information and the drilling parameters.

  • Various combinations of services and crew sizes depending on customer requirements and well complexity.

  • A portable laboratory ( Mud Logging Unit) that houses the hardware and software

  • Analysis conducted at wellsite during the drilling process and samples are returned to the operator after analysis.

Mud Logging lowers costs and improves the success rates. Manned Mud Logging uses sophisticated systems and experienced crews, which range from one to six people. Mud Loggers analyze geological data as well as drilling parameters to identify and quantify productive hydrocarbon reserves, subsurface formation porosity and formation fractures. This information is used to make recommendations that optimize drilling paths (geosteering) for maximum reserves and production. Mud Loggers also look at the filling parameters in conjunction with formation analysis in order to provide recommendations to improve drilling rates, reduce costs and enhance safety.

Advanced Mud Logging Equipment And Services:



Formation Evaluation

Analysis of the physical and chemical properties of formation cuttings to determine the classification of the subsurface rock formation, thereby aiding in the identification of pay zones.


Assisting operators in determining the optimum path of drilling a directional well in order to maximize hydrocarbon reserves and well productivity.

Drilling Optimization

Analysis of drilling parameters to optimize drilling rates and reduce drilling costs.

Fracture Identification

Identifying existing fractures in the rock surrounding a well that may contain oil and gas.

Thin Zones

Identifying thin zones in the well, which contain producible hydrocarbons. Thin zones often are overlooked and require sophisticated Mud Logging systems to help identify them.


Determining points of oil, water and gas in order to aid in quantifying the location of hydrocarbon reservoirs.

Gas Chromatograph

Tool that analyzes gas entrained in the drilling mud for its precise gas composition, which is used to perform complex analyses such as determine oil/water/gas, identify thin zones, identify fracture porosity and geosteer horizontal wells. High speed units can analyze the gas approximately every 30 seconds.


Tool that determines the amount of limestone and dolomite present in the formation in order to assist formation evaluation.

Datalog provides Mud Logging services in Columbia and Sudan.

Datalog’s experienced crews are specialists in manned Mud Logging services. Datalog has developed its experienced workforce primarily through internal training and promotion. Datalog typically hires junior personnel as sample catchers and trains them in accordance with our document training program. Sample Catchers are promoted to Mud Logger, Data Engineers and Pressure Engineers as they meet specific training and experience criteria required for advancement. Datalog ’s requirements for advancement include internal and external training classes with centrally controlled examinations. Also, the candidate must have minimum number of wells logged with excellent safety records and job performance.

Pressure Engineer

Predicts and interprets pore pressure, which is used for drilling safely and casing seat selection. Usually has at least one year experience as a Data Engineer. The individual also must have completed the abnormal formation pressure training class and has shown competence in pressure evaluation.

Data Engineer

Analyzes drilling and Logging data to make recommendations on drilling parameters. Also documents probable hydrocarbon rich pay zones. Usually has at least two years experience as a Mud Logger. This position requires a completed advanced Mud Logging, Hydrocarbon Evaluation, Drilling Engineering and Well Controls training classes. The person must have proven competence in the analysis of drilling operations.

Mud Logger

Prepares and analyzes cutting samples used for drilling and geological interpretation along with monitoring drilling parameters. Usually the Mud Logger has 6 to 12 months experience as a Sample Catcher, worked as a trainee and has passed the basic two part Mud Logging course.

Sample Catcher

Typically an entry level training position for Mud Loggers. Retrieves samples from the rig mud system for analysis and assists Mud Loggers, Data Engineers and Pressure Engineers.

Keywords: Drilling, Gas

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