Tubular Running, Casing Running, Tubular Handling and TRS are all interchangeable names for a generic process of handling tubulars on the rig, lowering tubulars to the well and installing casing accessories.
Tubular Running takes place during drilling operations with different types of casing being used at different predetermined depth intervals - conductor, surface casing, intermediate casing, production casing and production tubing, at well completion. Tubulars are stocked up on the rig (and replenished as required) prior to being run into the well. Various tubular handling tools are used to pick up, suspend, move and run tubulars into the well with the size and capabilities of these tools primarily determined by the well depth and well trajectory. Tubular handling tools include thread protectors, hydraulics power units, tongs to tighten connections, elevators and slips. These tools may be powered hydraulically, pneumatically or manually.
Casing accessories are installed when casing is run into the well. Casing accessories can include centralisers, scratchers, float collars and guide shoes. Some of the accessories (mainly shoes) may be preinstalled onshore (when drilling offshore wells) to save rig time.
This category is a high safety risk operation due to the frequent human contact with tubulars and handling equipment. As a result alternatives to manual/conventional setups have been developed to automate and minimise human contact in the operation. Whilst addressing obvious safety risks these solutions have helped drive greater efficiency and reductions in cost. There are number of systems available in the market including proprietary names such as Automated Casing Running Tool (ACRT)™, OverDrive™ and Casing Drive System™.
Tubular Running Services typically represents less than 2% of the well cost.