Drilling Fluid Technology for Gaoquan Anticlinal Wells in the Southern Margin of Junggar Basin

doi:10.11885/j.issn.1674-5086.2021.04.29.08

Abstract

Abstract: In view of the characteristics of the strata encountered in drilling the Gaoquan structure in the southern margin of Junggar Basin, the technical difficulties in this area were proposed. We analyzed the drilled well data and mineral composition and mechanical characteristics and found problems like a narrow drilling safety density window and large surface-subsurface temperature difference. Combined with the field conditions, the drilling fluid systems adapted to upper strata and middle and lower strata respectively are given. We proposed that a strong inhibiting water-based system; a medium density and strong sealing oil-based drilling fluid system is applied to the hard and brittle mudstone formation of Taxihe Formation in the middle and lower strata; and oil-based drilling fluid system with low filtration loss is applied to strong water-sensitive formation of Anjihaihe Formation. The results show that the strong inhibiting water-based drilling fluid system can effectively prevent collapse and pipe stuck in the upper part of the Gaoquan anticline formation on the southern margin; the high-density oil-based drilling fluid used in the middle and lower part of the formation has excellent anti-collapse and anti-leakage performance, with a temperature resistance range of -10 ℃ to 240 ℃, and can resist up to 40% brine intrusion and 10% water-sensitive cuttings contamination. The drilling fluid technology provides important technical support for the major oil and gas discovery in the Gaoquan structure, and can be used as a reference for drilling fluid solutions for exploratory wells in similar areas and formations.

Key words: southern margin of Junggar, Gaoquan anticline, exploration well, drilling fluid, countermeasures

CLC Number:

TE254

XU Shengjiang, WU Baocheng, XU Xinniu, YE Cheng, HUANG Hong. Drilling Fluid Technology for Gaoquan Anticlinal Wells in the Southern Margin of Junggar Basin[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(3): 89-97.

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