Requirements relating to NMDC use when surveying with magnetic instruments.. NMDC Length Every magnetic compass placed in a steel BHA will exhibit an azimuth error. This is caused by the interference between the magnetic field of the Earth and any BHA components which cannot be demagnetised (e.g. mudmotors). To reduce this error to an acceptable … Non-Magnetic Drill Collars
Submersible driling rig is one of the drilling rig design concepts for offshore shallow water environments. 1. Could operate in water depth of 3 to 30 m. 2. Environmental Impact Potentially low. 3. Can be designed for ice operations. 4. Suitable for exploration. 5. Would have to be built outside the Caspian and imported. 6. … Submersible drilling rig
Planning On a monthly basis the Drilling Contractor shall be provided with a list of proposed new locations. This list is initiated by Drilling Manager and includes buffer locations to allow for operational flexibility. The Construction Contractor shall plan for: access tracks cellar construction location conductor water supply. Preparation Access Tracks Preparation of access tracks … Site Preparation for Land Wells
Hydrographic Surveys When moving into a new location the following hydrographic surveys are required: seismic sidescan sonar water depth soil analysis. These surveys are by arranged by the marine supervisor upon the Operations Engineer’s request and are carried out prior to moving a rig onto a new location, or siting a jacket. Seismic Survey An … Surveys required before rig move – Offshore
Navigational Planning The Marine Officer should plan the courses between locations, and routes to be taken through fields with due regard for jackets and barges or other vessels which may be moored in the field. Calculation should be made of the points at which it will be safe to increase the draft by lowering the … Offshore Rig Moves Planning and Preparation
The following information should be included in the daily rig move report to be submitted to Superintendent. Onshore Rig Move Date Old location New location Total loads Loads moves % Rigged up % Rigged down Rig Move distance Equipment for rig move: Cranes and forklist at old locations (nb and type) Cranes and forklist at … Rig Move Dailly Report (Onshore and Ofshore)
For an area where no previous knowledge of jack-up penetration / sub-bottom information is available the location must be cored, this may be done by a coring vessel prior to rig arrival or from the rig upon positioning at the location. 1. independent leg jack-up rigs A) Location Area, block name or number, Latitude, Longitude. … Guidelines for Site Survey/ Hazard Requirements for Drilling Units
Responsibilities for preparation, approval and content of the drilling programme. Drilling Programmes are the approved instructions for carrying out activities and tasks which are required to achieve the objectives of the drilling process. Before commencing drilling operations, an approved signed copy of the Drilling Programme must be available on the rig site. Responsibilities The Drilling … Drilling Programme – Preparation and Content
This article describes the various ways of transmitting mechanical power to the bit by rotation. There must be sufficient HHP at the bit to keep the cutters or diamonds clean, and that an increase in mechanical power, applied to the bit with minimum vibration, will increase penetration rate. Mechanical power is the product of torque … Mechanical power to the bit / corehead
Jacket Supported Offshore Rig is one of the rig design concepts for shallow water environments. Steel Jacket can be tailored to water depth. Rig design is independent of water depth. Environment impact is low. Jacket could be designed to withstand ice loads. Installation and removal may be difficult as barge and crane are required to … Jacket Supported “Offshore’’ Rig