Dynamic Behavior of Drilling Fluid Leakage in Naturally#br#
Fractured Formations

doi:10.11885/j.issn.1674-5086.2014.06.05.04

Abstract

Abstract:

Lost circulation usually occurs in naturally fractured formation. It is very important to understand the dynamic behavior
of drilling fluid losses in lost circulation prevention and control. A one-dimensional infinite fracture model for describing
Herschel-Buckley fluid drilling fluid loss was established，and was used to investigate the effect of differential pressure，fracture
aperture and drilling fluid rheological property on fluid loss rate and ultimate loss volume. The results show that the loss
rate curve can be divided into three segments in double logarithmic coordinate. The first and the third segment are straight
line，and the middle segment is an arc. The fluid loss rate increases nonlinearly as fracture aperture and differential pressure
increases，and decreases as consistency factor，flow behavior index，and yield stress increase. Fracture aperture and loss rate do
not conform to the cubic law relationship. Ultimate loss volume increases linearly as the differential and the square of fracture
width increase，and decreases as yield stress and flow behavior index increase，with nothing to do with the consistency factor.
These results are useful to distinguish mud loss types and take reasonable lost circulation prevention and control measures.

Key words: lost circulation, fracture, Herschel-Buckley fluid, fluid leakage mechanism, fluid leakage rate

CLC Number:

TE28

LI Daqi1，2*, LIU Sihai1，2, KANG Yili3, ZHANG Hao4. Dynamic Behavior of Drilling Fluid Leakage in Naturally#br# Fractured Formations[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.06.05.04.

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Dynamic Behavior of Drilling Fluid Leakage in Naturally#br# Fractured Formations

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