EVALUATION OF DETARIUM MICROCARPUM AND BRACHYSTEGIA EURYCOMA AS VISCOSIFIER IN POTASSIUM CHLORIDE – POLYMER DRILLING MUD

O. I. Oboh, A. N. Okon, B, U. Nseh

Abstract


Drilling through trouble zones, like; high pressure zone, shaly formation, thief zone, among others requires special formulated drilling muds. One of such drilling muds is KCl-Polymer mud to inhibit shaly formation; as water-based mud interactions with the formation leads to pipe sticking. Formulating this KCl-Polymer mud requires enhanced polymers as viscosifiers to achieve some of its basic drilling fluid functions. Regrettably, these polymers are imported and
the total dependence on these polymers is worrisome as it results to a high overall well drilling cost in Nigeria. Therefore, this study evaluates the use of Detarium microcarpum and Brachystegia eurycoma seeds as viscosifiers in the KCl-Polymer mud and results compared with Polyanionic cellulose (PAC R) content for the same mud. The results obtained depict that the
Detarium microcarpum (Ofor) at 2 g content compared favourably with 1g content of PAC R as viscosifier in the KCl-Polymer mud. Also, Brachystegia eurycoma (Achi) at 5 g content compared with 1 g content of PAC R in the mud. Additionally, at 150 oF, the 5 g content Brachystegia eurycoma (Achi) had negligible gel strength unlike its Detarium microcarpum (Ofor) counterpart
which had flat gel characteristic even at high temperature. Furthermore, the results depict that the KCl-Polymer mud’s yield point (YP) was drastically reduced at low Detarium microcarpum and Brachystegia eurycoma contents in the mud. Therefore, the viscosifying potential of the Detarium microcarpum (Ofor) in KCl-Polymer mud for drilling through trouble formations can be exploited; as it seems promising. This development will reduce: over dependence and importation of foreign polymers, total drilling cost and boost the Nigerian economy.


Keywords: Detarium microcarpum; Brachystegia eurycoma; Viscosifiers; KCl-Polymer; Drilling mud.


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