Performance Drilling Fluids

Cesium formate brine can deliver high performance, time savings and borehole stability while minimizing environmental impact, waste management and operating costs.

A superior performance drilling fluid is needed for extreme narrow window, extended reach or horizontal drilling. Cesium formate brine can enable:

  • Highest rate of penetration (ROP)1. Potassium formate fluids outperform standard oil-based mud (OBM), according to multiple wells drilled in Western Canada. The ROP increased 30 to 50% and the bit life more than doubled. Additionally, the operator noted a 30 - 40% average savings in drill time, 17 - 27% fluid cost savings, and 27% total drilling well cost savings.
  • Excellent shale stability. Cesium and potassium formate brine have excellent inhibitive properties and low water activity, which deters swelling of the most reactive shales and provides excellent wellbore stability at any temperature.
  • Lowest equivalent circulating density (ECD). The risk of hydraulic fracturing is reduced with cesium formate brine. Hydraulic simulations and field experience have shown that ECDs and transient pressures are lower for any given pump rate as compared to conventional solids-weighted mud.
van Oort E (2015, March 17) ROP Enhancement in Shales through Osmotic Processes, Society Petroleum Engineers 173138-MS

The driver for this drilling fluid choice was improved well control. The high density, solids-free nature of the potassium/cesium formate brine provides low ECD, eliminates the risk of barite sag, and dissolves very low amounts of reservoir gases.

Statoil, SPE/IADC 105733
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