Drilling Fluid′s Damage Depth Prediction Method Based on the Grey
System Theory

doi:10. 3863/j. issn. 1674 – 5086. 2013. 03. 013

Abstract

Abstract:

Because drilling fluid′s damage is influenced by various factors，it′s difficult to forecast the damage depth just by
a simple functional relationship. The grey theory holds that all random processes are grey processes of change in certain space
and time，and the potential law can be explored through many discrete messages. The results of study show that the depth of
drilling fluid damage is closely related to porosity，permeability，gas saturation，formation electrical property，shaft differential
pressure，drilling fluid density and so on. By taking various parameters influencing drilling fluid damage depth as observed
values，we establish the static and dynamic grey forecast model based on the theory of grey theory，and write a forecast software
of drilling fluid damage depth. Besides，we present the judgments standard of credibility of damage depth prediction through
quantitative forecasting the drilling fluid damage depth of a well in Tazhong area. The above results provide a good theoretical
basis for timely，rapid and intelligent while-drilling prediction of damage depth.

Key words: drilling fluid, damage depth, grey system theory, credibility, judgment standard, example analysis

Fan Xiangyu1，2, Wang Junrui2, Xia Hongquan2, Gong Ming3, Zhang Ping2. Drilling Fluid′s Damage Depth Prediction Method Based on the Grey
System Theory[J]. 西南石油大学学报(自然科学版), DOI: 10. 3863/j. issn. 1674 – 5086. 2013. 03. 013.

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