Formate Technical Manual, Part B: Compatibilities and Interactions
Section B11: Compatibility with Shale
|
|
It is a known fact that fluids based on potassium and cesium formate brines are amongst the best shale stabilizing water-based drilling and completion fluids currently available. Unlike other shale stabilizing drilling and completion fluids, the shale stabilizing properties of formate fluids are attributable to the inherent properties of the formate brine itself rather than to additives. This has the great advantage that the shale stabilizing properties do not deplete with time, and no complicated and/or expensive maintenance is required.
This section of the manual explains the mechanisms involved in borehole instability and how formate brines prevent this from happening. Methods for testing borehole stability are described and results of shale stability testing in formate brines are shown. Relevant field experience with formate brines from the open literature is reviewed.
To be advised of updates to this chapter please mail us.
> Download your copy here |