Invasion Depth Model for Drilling Fluids in Fractures in Dense Sandstones

doi:10.11885/j.issn.1674-5086.2017.04.25.03

Abstract

Abstract: The pore structure and fractures of the reservoir in the Keshen site of the Kelasu Gas Field cause significant leakage of drilling fluids while drilling. In particular, solid particles block the fractures, leading to low or even zero productivity for some wells after completion. In the field, acid fracturing is mainly employed to remove blockage. The variations in the invasion depth of the drilling fluid in fractures can reflect the performance of acid fracturing. Concerning this issue, according to the flow mechanism of Newtonian fluids in fractures, fracture aperture variations, and filtration losses of fracture walls, a dynamic model for drilling fluid leakage in a single fracture is established. The invasion depth of the drilling fluid is quantitatively described based on the distribution of the drilling fluid pressure inside the fracture. The relationship between the invasion depth and invasion time and that between the pressure difference and fracture aperture are considered and analyzed. Finally, using the established model, the relationship between the invasion depths of the acid and drilling fluid is predicted. The results are compared with the actual values obtained from the Keshen C well, indirectly validating the model.

Key words: fractured reservoir, drilling fluid, leakage, dense sandstones, invasion depth

CLC Number:

TE254

LEI Qiang, TANG Hongming, ZHANG Liehui, ZHU Boyu. Invasion Depth Model for Drilling Fluids in Fractures in Dense Sandstones[J]. 西南石油大学学报(自然科学版), 2018, 40(4): 97-104.

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