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Functions and Technological Development of Drilling Fluids
Release Date:
2016-05-06
Author:
Carrying function: During drilling fluid circulation, the fluid itself carries cuttings generated at the bottom of the well by the drill bit to the surface, thereby keeping the wellbore clean, ensuring smooth tripping operations, and guaranteeing that the drill bit remains in continuous contact with fresh formation material at the bottom, preventing redundant cutting and enabling safe, efficient drilling.
Carrying function: During drilling fluid circulation, the fluid itself carries cuttings generated at the bottom of the well by the drill bit to the surface, thereby keeping the wellbore clean, ensuring smooth tripping in and out, and guaranteeing that the drill bit remains in continuous contact with fresh formation material at the bottom, preventing redundant cutting and enabling safe, efficient drilling.
Suspension: During make‑up and break‑out operations, or when circulation is temporarily halted for any reason, the drilling fluid, relying on its viscosity and shear stress, keeps drill cuttings suspended in the fluid, preventing them from settling rapidly and thereby avoiding complications such as sand‑set‑in‑the‑bit.
Stabilize the wellbore:
1. Select an appropriate drilling fluid density to provide sufficient support to the wellbore, thereby preventing downhole complications such as wellbore collapse.
2. The drilling fluid exhibits excellent filtration and mud‑cake‑forming properties. It forms a thin, tough mud cake on the wellbore wall, stabilizing the drilled formation and preventing fluid invasion, thereby mitigating the degree of hydration‑induced swelling and dispersion in shales.
3. The drilling fluid exhibits excellent inhibition, reducing the degree of hydration‑induced swelling and dispersion of mudstone and shale.
Polymers play a crucial role in enhancing drilling rates and maintaining wellbore stability. The introduction of polymer-based drilling fluids marks the transition of drilling fluid technology into a scientifically advanced stage. Polymer drilling fluids can be classified into the following types:
(1) Partially hydrolyzed polyacrylamide system
(2) Potassium Chloride Polymer Drilling Fluid System
(3) Hydroxyethyl cellulose system
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Hebei Kaijin Machinery Equipment Trading Co., Ltd.
39 Tanan Road, Yuhua District, Shijiazhuang City, Hebei Province
