FORMATION DAMAGE TESTS OF SOME COMPLETION FLUIDS
Completion and workover fluids are invading into the producing zone causing formation damage. This damage may be induced due to precipitation of some solid particles suspended in workover fluids or incompatibility of workover fluids with producing formation, formation water and crude oil. Therefore, brines are commonly used as workover fluids. In the present work, a laboratory study was carried out to investigate the effect of employing some workover fluids on formation permeability. Workover fluids used were 8.5 ppg low density calcium chloride brine, 14.5 ppg high density calcium chloride/calcium bromide brine, low density brine with 0.3% surfactant and high density brine with 0.3% surfactant (Petronate). Results showed that damage may be reduced when low density calcium chloride fluids are used. Also, the addition of surfactant (Petronate) to the workover fluids can improve formation permeability and reducing formation damage.
- Glenn, E.E., Slusser, M.L., and Huitt, J.L. “Factors Affecting Well Productivity – Parts I&II”, Journal of Petroleum Technology, May 1957.
- Moore, J.E. “ Clay Mineralogy Problem in Oil Recovery”, The Petroleum Engineer, Feb.1960.
- Wedel, F.L., Haagensen, R.V., and Poch, H.F., “Oil Field Brine Filtration: Seven Years of Procedures, Problems, Solutions and Results”, Fluid Particle Sep.J., 1992.
- Neasham, J.W. “The Morphology of Damage Dispersed Clay in Sandstone Reservoirs and Its Effect on Sandstone Shaleness, Pore Space and Fluid Flow Properties”, SPE No.6558, October 1977.
- Morgenthaler, L.N. “Formation Damage Tests of High Density Brine Completion Fluids”, Paper SPE 14831, 1986.
- Houchin, L.R., Baijal, S.K., and Foxenberg, W.E. “An Analysis of Formation Damage by Completion Fluids at High Temperatures”, Paper SPE 23143, 1991.
- Hower, Wyne F. and Stegelman, J. “Increased Primary Oil Production by the Wise Use of Surface Active Agents”, API Division of Production, Paper 826-27-A, April 26, 1956.
- Hall, B.E. and Lasater, R.M. “Surfactants for Well Stimulation”, Presented before the Division of Petroleum Chemistry, American Chemical Society, Feb. 1970.
- Baijal, S.K., Houchin, L.R., and Bridges, K.L. “A Practical Approach to Prevent Formation Damage by High – Density Brines During the Completion Process”, Paper SPE 21674, 1991.
- Adel M. Hemeida and Ahmed Gawish “ Evaluation The Potassium Bromide And Zinc Bromide BrinesFor Workover Operations”, Oil and Gas Business, 2007, http://www.ogbus.ru/eng/authors/Hemeida/Hemeida_1.pdf