Journal of Engineering and Applied Science
Volume 4, June 2012
© 2012 Cenresin Publications
DETERMINATION OF THE RHEOLOGICAL PROPERTIES OF DRILLING FLUID FROM LOCALLY SOURCED CLAY FROM VARIOUS GEOGRAPHICAL AREAS
Ajugwe .C, Oloro. J and 3Akpotu. D.
Department of Petroleum Engineering
Delta State University, Oleh Campus
The rheological formulation of our locally sourced bentonite clay in substitute for the imported foreign bentonite clay was carried out by the comparative analysis of the parameters of the local mud with the stipulated API standard values to ascertain the level of compliance in drilling operation. The local muds PH values responded positively on beneficiation with 1.0g of potash, the modification raised the muds PH values to fall within the standard range of 9.5 to 12.5. The viscosity of the local muds was seen to be slightly below the standard requirement of 30cp, but appreciated favorably to the standard requirement when beneficiated with 1.0g of drispac. On beneficiating the foreign aqua gel bentonite muds, with the same quantity of additives used on other mud samples, there was an excessive abnormal increase in its viscosity for instance the viscosity of 17.5g of the foreign mud was drastically raised from 17.1cp to 210.5cp at 600 dial reading. It was obvious that most of the prepared local mud samples parameters such as the sand percentage composition, power law index, density, marsh funnel viscosity, etc met the minimum required specifications, while other few parameters such as the theological properties, needed some additive treatment for favorable comparison with the foreign clay mud properties. Therefore, the utilization of these clays for any industrial application will pose no harm to surface and surface facilities and will in no turn represent a value added to the Nigeria economy by the total prevention of the important of high quality activated foreign bentonite clay. Tests and analysis were carried out on Local Clay samples obtained from a town in delta state, imo state and the foreign commercial bentonite. This research is to evaluate the performance of the Local clay samples for drilling operations in Nigeria. The rheological and the thixotropic properties as well as other parameters of the Local clay mud was seen to have improved, but however, when beneficiated with chemical additives of different concentrations, there was an increase in the overall parameters of the Local mud samples, making them ideal for any industrial application as their parameters met with the stipulated standard specifications of API, OCDA.
This paper basically details on the rheological formulation of our locally sourced bentonite clay in substitute for the imported foreign bentonite clay. This is achieved by the comparative analysis of the parameters of the local mud with the stipulated API standard values to ascertain the level of compliance in drilling operation. The properties of a drilling fluid can be grouped under the categories: Rheological properties, gel strength (thixotropic) properties, filtration property and mud weight property. In geology, rheology is defined as the study of how matter deforms the flows, including its elasticity, plasticity and viscosity. Bentonite is a major additive, which gives the proper rheological (non Newtonian shear thinning) and filtration(Mihalakis, Th.S.et al). In drilling fluids it is the study of the deformation and flow of matter. The term is also used to indicate the 38
Determination of the Rheological Properties of Drilling Fluid from Locally Sourced Clay from Various Geographical Areas
Ajugwe .C, Oloro. J and 3Akpotu. D.
properties of a given fluid, as in mud rheology. Rheology is an extremely important property of drilling muds, work-over and completion fluids, cements and specialty fluids and pills. Mud rheology is measured on a continual basis while drilling and...
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