Experimental Results on Solid-Free Well Completion Fluids under Critically Low Temperature Conditions in Arctic Fields

The article discusses the development and application of heavy kill fluids (HKF) for well completion and workover operations under conditions of abnormally high formation pressures (AHFP). Particular attention is given to salt-based compositions with densities of ۱۶۰۰, ۱۸۰۰, and ۲۰۰۰ kg/m۳, which are designed for use in various climatic environments. Experimental studies were conducted to determine their rheological properties, pH, crystallization temperature, corrosion activity, and contraction behavior when mixed with water and other solutions. It was found that with increasing fluid density, the mass fraction of salts rises, pH decreases, and the corrosion rate at elevated temperatures increases, necessitating the use of corrosion inhibitors. All tested fluids exhibit low crystallization temperatures, which ensures their effective application in winter conditions. The contraction phenomenon˗volume shrinkage upon mixing with water˗was also identified and shown to depend on fluid density and salt concentration. The results obtained make it possible to optimize the composition of HKFs and improve the safety and cost-effectiveness of well completion and workover operations under AHFP conditions.

کلیدواژه ها:

Heavy Kill Fluid ، Abnormally High Formation Pressure ، Rheological properties ، corrosion ، Crystallization Temperature ، contraction ، salt solutions