An Integrated Approach For Acidising Job Design Via Rapid Mineralogy Analysis
H.X. Dan, N.S. Sadan, L.C. Chisholm, A.M. Abu Bakar and D. Burkett
Event name: EAGE Conference on Reservoir Geoscience 2018
Session: Session 13: Production and Operation Geoscience
Publication date: 03 December 2018
Info: Extended abstract, PDF ( 227.07Kb )
Price: € 20
The study scope was to identify a compatible acid type for removing HEC Pills (LCM materials) and to formulate non-damaging acid systems to the specific formation mineralogy. In order to complete this, the mineralogy of the targeted reservoirs would be required to identify the presence of any unstable clay types which would react with acid. Some of the petrographic study results from major reservoirs that had core taken showed abundant presence of unstable clay types, such as chlorite and mica. Due to the absence of conventional core for the undeveloped reservoirs, cuttings were instead used and petrographic studies were carried out. Due to the constrained timeline the project team opted for mineralogical analysis using a portable X-ray diffraction (XRD) instrument. The results would later be compared with traditional laboratory powdered XRD analysis which determine the types and quantitative bulk composition of clays present in the sample. As petrographic studies are dependent on sample preparation, some variations in qualitative and quantitative mineralogy were observed between petrographic analysis and XRD analysis. Nevertheless, portable XRD was able to identify the presence of similar minerals with rapid analysis and this could be adapted for potential wellsite use in the future.