Branched synthetic polymer viscosifier and fluid loss additive
Primary viscosifier for the VeraTherm high-temperature water-based drilling fluid.
Drilling wells with bottomhole temperature exceeding 300 degF requires the use of high-temperature-stable, water-based drilling fluids. Formate brines and supplemental thermal stabilizers are used to help extend the thermal stability of conventional polymer-based drilling fluids. However, this approach fails to provide the long-term thermal stability needed for extended wireline logging operations and requires substantial treatments plus several trips.
VeraTherm high-temperature water-based drilling fluid features a dual-function VeraVis branched synthetic polymer that acts as a viscosifier and fluid loss additive. This additive enhances the rheological profile and fluid loss control along with long-term stability and low sag tendency at elevated temperature conditions. The long-term thermal stability characteristic of the VeraTherm fluid is not only ideal for high-temperature wells requiring extended wireline logging, but has plenty of benefits:
VeraTherm exceeded the client expectation, providing excellent drilling performance, and remained stable for 7 days at 375 degF [191 degC].
M-I SWACO drilling solutions expert explains achieving long-term fluid stability above 300 degF.
Enhanced rheological profile and fluid loss control with low sag tendency.
Water-based drilling fluid provides thermal stability to maintain rheology and fluid loss control in high-temperature wells.