Abstract Preventive treatments are the best method to avoid Preventive treatments are the best method to avoid contamination. However, if it occurs, it is necessary to restore the original properties off drilling fluid by addition of chemicals after the contamination. The changes in the drilling fluids properties, determined by regular test at specified intervals, will indicate the type and degree of contamination and required treatment.
This paper Presents a software which identifies various contaminants from the analysis of their properties during drilling operations.
A TURBO PASCAL program was developed using some artificial intelligence techniques. This program, named SIC (System for identifying Contaminants), verifies, for each usual contaminant, the possibility of its degree Of influence on each drilling fluid property.
Introduction The aim of the present system is to aid in taking decisions for solving the occurrence of contamination of the employed drilling fluid during oil well drilling.
By contaminant there is understood any naturally occurring or manufactured material, which is part of the fluid composition without any deliberate intention, altering one or more of the properties of same. properties of same. The well drilling activities require a swift action in deciding due to factors mainly concerned with security and cost. The knowledge of physical-chemical aspects of subsurface formations, especially in recently discovered areas, is limited. The control of drilling fluid's properties, by periodical physical and chemical tests, permits to keep these properties within programmed time schedules. As determinated by this monitored schedule, the alterations in fluid's behaviour will show in advance the type, degree of contamination and the treatment required for this kind of fluid. Preventive treatment is the method for avoiding contamination. Notwithstanding once same occurred, it is necessary to restore fluid's original properties.
The most common preventive treatment consists in adding certain monovalent and polyvalent salts and/or bases. The treatment is known as "fluid conversion" because it transforms the non inhibited fluid in an inhibited fluid, making same immune to the action of some contaminants.
P. 79