DELTA-TEQ system reduced downhole losses by 50% while running and cementing liners
A customer in the Norwegian sector of the North Sea needed to drill and navigate through complex geological formations and a low fracture gradient, where maintaining low equivalent circulating density (ECD) was essential in protecting the formation against excessive hydraulic pressure.
The DELTA-TEQ™ low-impact, non-aqueous drilling fluid system was chosen for the job because of its highly stable properties and ideal rheology for low hydraulic impact. The DELTA-TEQ system was formulated to reduce hydraulic impact on the wellbore, minimize the delta between static and circulating density, protect against surges, and ensure that solids remain in suspension to avoid sag issues. Traditional challenges in offset wells include a very narrow operating window, hole cleaning complications, and excessive downhole losses while running and cementing the liner.
The objectives for Baker Hughes, a GE company (BHGE), were:
- Deliver low ECD margins
- Minimize the risks associated with drilling a 7,874-ft (2,400-m) section through the overburden
- Successfully drill into a reservoir with a low fracture gradient, ranging from 14.99 – 14.56 lbm/gal (1.80 – 1.75 sg), and a complex geological formation
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