Abstract
This research work focuses on finding more effective polymers that can improve the rheological properties of bentonite mud. Various mud samples were formulated with natural polymers obtained from corn starch, cassava starch, purple potato starch, yellow potato starch and saw dust consisting of different masses which were not treated or purified by any chemical method before and after preparation along with the control mud. Rheology tests were carried out to determine the plastic viscosity, apparent viscosity, yield point, gel strength among others. API standards were followed throughout the experimental study and the result from this investigation showed that increasing the concentration of polymers enhances the mud rheological properties studied at ambient condition, wherein thermal stability was exhibited up till 100°C. Thus, environmental friendly alternatives have been discovered for drilling fluid additives which are cheap, organic, bio-degradable, non-toxic and easily available
Highlights
The successful completion of an oil well and its cost depend to a considerable extent on the properties of the drilling fluid
The result of the experiment obtained have been compared with the American petroleum Institute (API) standard specification for drilling mud and these specifications are for all the montmorillonite clay family as contained in API practices 13A [19]
Drilling Fluid Property Mud density (1b/gal) Viscometer dial reading at 600rpm Plastic viscosity Yield point (Ib/100ft2) Fluid loss (Water) pH level
Summary
The successful completion of an oil well and its cost depend to a considerable extent on the properties of the drilling fluid. The number of rig days required to drill to total depth depends on the rate of penetration of the bit, and on the avoidance of delays caused by caving shale’s, stuck drill pipe, loss of circulation, etc., all of which are influenced by the properties of the drilling fluid. The drilling fluid affects formation evaluation and the subsequent productivity of the well. It follows that the selection of a suitable drilling fluid and the day-to-day control of its properties are the concern of the mud engineer, and of the drilling supervisor, the drilling foreman, and drilling, logging and production engineers. Drilling and production personnel do not need a detailed knowledge of drilling fluids, but they should understand the basic principles governing their behavior, and the relation of these principles to drilling and production performance [1]
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