Abstract
This case study presents a novel approach to capturing torque and drag trends real-time while drilling complex and extended reach wells. Data processing algorithms automatically process rig sensor data. They recognize current rig operations and log drill string torque and drag parameters. Data is automatically collected, presented and shared without any exposure to human error or interpretation in data recording, allowing engineered real-time and longer term decisions to be made with accurate and consistent data. The tool relies on updated torque and drag models but otherwise works without further input or drilling process interruptions and it does not require extra personnel on or off-site.
The main purpose of the new system is to confirm hole condition. The system acquires and displays well documented field and operation specific drag values. On Maari this information has been used to make strategic decisions on mud systems, critical casing runs, running strings, trajectories, accessible targets and contingency planning.
The paper outlines the monitoring process and system support. It will present actual results and detail how its use has aided planning, drilling and logistics. Field data will be presented in support of the examples listed below.
• minimized back-reaming during drilling connections and overall reduced hole cleaning efforts
• real-time decisions on location, need and quantity of HWDPs or DCs in the screen running strings, avoiding rig time to pick up tubulars from deck
• confident decisions to swap from synthetic to water-based mud in hole sections that industry experts have previously classified as ‘border line casing floatation area'
• elimination of synthetic-based mud in intermediate sections, the overall environmental impact of the drilling campaign has been drastically reduced
• planning a new extended reach well based on monitoring results has allowed appraising and potentially producing off structure reserves otherwise stranded
• the field application has also proven 24/7 support and maintenance of equipment far off service provider home base
The case study also outlines technical difficulties encountered and how these were addressed during product testing and its first commercial field application.
