While drilling an interbedded formation consisting of sandstone, siltstone, and coal, an operator experienced tight hole, excessive backreaming, and increased circulation time during tripping that caused formation instability. In the next well, a stuck event of 13 3/8-in casing caused approximately 800 ft [244 m] of the formation to be exposed in a 16-in rathole, increasing the exposure time and risks when drilling the next hole interval. M-I SWACO proposed adding POROSEAL Plus latex-based fluid loss control sealant to the HydraGlyde high-performance water-based drilling fluid system.