A fully equipped computerised mud logging unit shall be available for recording and monitoring well generated data, for all exploration wells. There is no mandatory requirement for a full Mud Logging service for development wells which are not designated HTHP wells.

Requirements

The general requirements for the mud logging service to be provided are included in the contact:

• monitoring
• pore pressure prediction
• geological services
• logs/reports

Additional evaluation required by the Drilling Department or by the Petroleum Engineering Department shall be included in the Drilling Programme.

• hole sections or intervals to be logged
• any additional monitoring required
• any standard monitoring not required
• dry and wet cutting sample requirements (depths, intervals etc.) as per programme.

Preparation

The following equipment checks shall be made prior to commencing mud logging operations.

• Prior to commencement of each well to be logged a full calibration of each sensor must be performed. Results of the calibration shall be reported on a calibration record which shall include date, high and low voltage/current readings, high and low parameter values and comments. Each sensor calibration shall be verified by the Drilling Supervisor.
• The following safety features shall be operational:
• The operation of the unit shut down system.
• The direct communication line with the rig floor.

Minimum Equipment Requirements

The unit should be equipped with the following:

• One 2 kg dry powder extinguisher
• One C0₂ extinguisher
• One 30 minute BA escape set.

A serviceable intercom system shall be installed from the logging unit to the Drilling Supervisor’s office.

The gas detection systems should be checked and calibrated once a week and results recorded in a log book.

H₂S detectors should be calibrated to initiate an audio/visual alarm on the drill floor at 10 ppm.

Gas sensors should be explosion proof and placed as follows:

• Shale shakers
• Drill floor
• Cellar

The Drilling Supervisor should ensure that the mudloggers are fully conversant with H₂S procedures.

Pit lever indicators should be explosion proof.

The response of the mud loggers to unexpected pit level changes should be tested at regular intervals and their response recorded on the mud loggers checklist.

The mud logging contractors technician should make regular visits to the units (minimum once per month). These visits should be recorded in the mud logging units log book.

Before the commencement of Mud Logging the Drilling Supervisor shall check that the unit meets the Contract Specifications. Any deficiencies must be reported to the Operations Engineer who shall inform the contracto