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Identification of Formation Scale and Modeling of Treatment Fluid

Author Affiliations

  • 1 Department of Petroleum and Gas Engineering, Faculty of Engineering, University of Port Harcourt, NIGERIA

Res. J. Engineering Sci., Volume 1, Issue (3), Pages 5-10, September,26 (2012)

Abstract

The formation of mineral scales is one of the most common problems in oil wells around the world and despite great technological developments by engineers, this problem remains without an effective solution. Scale may form anywhere from the reservoir formation to the well bore; affecting tubing, choke valve and production equipment. This work was undertaken to experimentally identify the composition of mineral scales that occur in a typical Niger Delta oilfield well location. Three methods were used in the analysis; The quantitative, atomic absorption spectrometer (AAS) and X-ray fluorescence (XRF) spectrometric testing equipment. Scale samples from production valves were collected from two fields in Niger Delta. Test results indicated that the main constituents of the scale were iron oxide, calcium carbonate and iron carbonate, typical of sandstone and carbonate reservoirs found in the Niger Delta. Though 15% HCl was faster than 10% HCL in dissolving the scales, 10% HCl with corrosion inhibitor is recommended for field application to avoid intense corrosion of pipes, valves and tubing used in the production lines. Results validated from the model equation indicated a high level of accuracy with less than 2% accuracy, hence, could be used to predict the optimum time and concentration of HCL without going through rigorous laboratory testing protocols, thereby, serving operation time and cost.

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