An Experimental Study on Particle Sizing of Natural Substitutes for Drilling Fluid Applications (original) (raw)
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Effects of Solid Contents and Various Additives in Drilling Fluids
The project is done to study about the effects of solid contents and various additives in drilling fluids. The objectives of this project work were to determine the Viscosity & Density of Mud Additive (Barite BASO4 specific gravity :4.10 ~ 4.20), while STPP(sodium tri-polyphosphate Na 5 P 3 O 10) is Viscosifier.The scope of this project is limited to Water based muds only.
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This paper is to formulate locally drilling mud that will be used to drill trouble zones formations successfully. Trouble zones are zones with abnormal characteristics encountered during drilling operations, such as zones of high circulation lost and zones with high formation pressure. In this paper, the zone of abnormal lost circulation was considered. For drilling to be successful drilling mud was formulated and beneficiated to lessen its filtrate into the formation and also raise its density. The outcome of this research work shows that mud formulated and beneficiated with local clay and bentonite had a decrease of filtrate volume (in percentage (%)) into the formation from 22.3 to 7.8 and 5.6 to 5 respectively. The outcome of mud density after beneficiated with 70g of barite and subjecting it to temperatures up to 80°C was still very high (12.6ppg for local clay and 13.4ppg for bentonite). Since local materials used here had close results in cumulative filtrate loss and mud density, they can make use instead of foreign materials so as to save more resources that are spent on importation.
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The fluid loss property of mud formulated with variable quantities of starch and cellulose extracted from cassava and their rheological properties have been studied. The outcome was compared with those of the standard mud formulated from Polyanionic Cellulose (PAC) and Industrial starc. The results show that increasing the concentration of starch in the mud system does not give a significant change in fluid loss property. Which suggest that Cellulose is a better fluid loss control agent than Starch. Hence these polymers have potentials as polymeric additives for drilling mud. Also, the water loss analysis showed that the local drilling fluid has a lower fluid loss of between 3.20-7.70 mls and a Plastic viscosity (PV) value of 10 centipoids (Cp) as against 14 Cp of the standard mud. Confirming that the local (Polymer) mud has the ability to maintain optimal pressure and torque in the borehole, hence preventing the problem of stuck pipe during drilling operations. Again, the Polymer mud has a yield point of 30lbs/1000ft 2 as against 42lbs/1000ft 2 of the standard mud. Confirming that the polymer mud conforms to the standard range of (30-40lbs/1000ft 2) as the required range of Yield Point (YP) that will ensure the removal of cuttings from a large diameter hole.