RE: RNS2 Nov 2022 08:19
Seems it is a technique to strengthen the well bore as they've said in the RNS, this seems to agree its a recognized practice and all is good so far..
"Introduction
The effects of drilling fluids loss and mud plastering have been studied in recent years, especially with the increase in wellbore stability issues and lost circulation challenges in complex reservoirs. During drilling fluids invasion, bottomhole pressure forces fluid particles to penetrate the near wellbore fractures and pore throats, and these particles can accumulate to form a rigid filter cake (Farahani et al., 2014, Civan, 2007). This is often referred to as mud cake wellbore strengthening or wellbore stabilization. In simple terms, wellbore strengthening can be described as a variety of approach that gives room for drilling a wellbore or an interval of interest with an increased fracturing pressure. Recent studies have revealed that wellbore strengthening can be achieved through mechanisms such as fracture opening and closure, as well as, mud cake plastering (Dorman et al., 2015, Contreras et al., 2014, Guo et al., 2014, Nwaoji et al., 2013, Salehi and Nygaard, 2011). Irrespective of the mechanism, the primary goal is to increase the fracture gradient in operational mud window, especially when drilling through a depleted reservoir."
https://www.sciencedirect.com/science/article/abs/pii/S1875510017304948