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Home  >  Volume 38

41. Evaluating the Effect of High Flow Rate on Low Viscosity Drilling Fluid with Respect to Hole Cleaning by S.F. Ofesi, S.I. Onwukwe and U.I. Duru Volume 38, pp 291 – 296
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Several suggestions have been made in years back to prevent cutting bed formation in deviated wells. Drilling fluids are designed in such that they suspend drilling cuttings when the flow is stop. But having met this criteria, cutting beds are still formed. The settling down of cutting bed makes this function of drilling fluid almost impossible. The formation of cutting bed due to the inability of the drilling fluid to establish this function brings about the objective of this research work. The main objective is to evaluate the effect of high flow rate on low viscous drilling fluid with respect to hole cleaning. This was carried out by thelaboratory formulation of synthetic drilling fluidandit viscosity was variedfrom low to high. A test for it rheological properties were carried outusing Fann viscometer and the data obtained were recorded. The plastic viscosity and yield point were calculated from existing equations. The values for their rheological properties were tested using an existing hole cleaning model to determine which fluid will give an excellent hole cleaning value (CCI > or =1) as a result of change in viscosity and at what flow rate this value can be obtained for an 8 ½ inches open hole section. When thevaluesof the rheological properties were tested in the hole cleaning model, it was observed that an excellent hole cleaning value was obtained using low viscosity drilling fluid at an optimum flow rate which falls within the flow margin of the hole size.

Keywords: Fluid viscosity, Hole cleaning, Cutting Carrying Index(CCI).