Environment-friendly type high-performance water-based drilling fluid and preparation method thereof

Abstract

The invention provides environment-friendly type high-performance water-based drilling fluid and a preparation method thereof and belongs to the field of drilling fluid. The environment-friendly typehigh-performance water-based drilling fluid is mainly prepared from water and components based on the mass fraction of the water: 0 to 2 percent of bentonite slurry, 2 to 4 percent of a polyamine inhibitor, 12 to 17 percent of composite formate, 0.5 to 0.8 percent of a polymer strong coating agent, 1 to 2 percent of a polymer filtrate loss reducer, 0.5 to 0.8 percent of compound ammonium salt, 0.5to 0.8 percent of technical-grade low-viscosity carboxymethyl cellulose, 2 to 3 percent of low-fluorescence white asphalt, 0.3 to 0.5 percent of a biological polymer, 4 to 6 percent of a vegetable oil lubricant, 2 to 4 percent of light calcium carbonate, 1 to 2 percent of heavy calcium carbonate, 0.5 to 0.7 percent of potassium hydroxide and 50 to 120 percent of barite powder. The invention provides the environment-friendly type high-performance water-based drilling fluid which has an inhibitive property and a lubrication property comparable to oil-based drilling fluid, acceptable cost and high environmental friendliness, and can meet safe and rapid drilling requirements of a high-difficulty complex well as well as a large-displacement directional well and horizontal well, and the preparation method of the environment-friendly type high-performance water-based drilling fluid.

Description

Technical field: [0001] The invention relates to an environment-friendly high-performance water-based drilling fluid and a preparation method thereof, belonging to the field of drilling fluids, in particular to an environment-friendly high-performance water-based drilling fluid and a preparation method thereof. Background technique: [0002] Drilling fluid is mainly used to carry cuttings from the bottom of the well to the surface and clean the bottom of the well in the initial stage of rotary drilling for oil production. It is also responsible for cooling and lubricating the drill bit and drill string, balancing the formation fluid pressure, the side pressure of the rock on the well wall, etc. It is the blood of drilling; water-based drilling fluid is a sol-suspension mixed system with water as the dispersion medium and clay (bentonite), weighting agent and various chemical treatment agents as the dispersion phase. , clay, weighting agent and various chemical treatment agen...

AI Technical Summary

Problems solved by technology

[0003] At present, there are few water-based drilling fluids that can not only meet the increasingly stringent environmental protection requirements, but also reduce the cost of drilling fluids, and can meet the safe and fast drilling requirements of complex wells, extended-reach directional wells and horizontal wells. Synthetic drilling fluids developed abroad Although environmentally friendly drilling fluids such as base and methyl glucoside are non-toxic and biodegradable, they are expensive and cannot be widely used; for this reason, a set of environmentally friendly drilling fluids that meet environmental standards, acceptable cost and can meet the requirements of difficult and complex wells The environment-friendly high-performance water-based drilling fluid system for extended-reach directional wells and horizontal wells is imminent

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