Coated flocculant for drilling fluid

Abstract

Coated flocculant for drilling fluid, belonging to the technical field of drilling fluid, comprising 20-50 parts of potassium chloride, 10-18 parts of sodium carbonate, 5-5 parts of 2-acrylamide-2-methylpropanesulfonic acid in terms of mass fraction 15 parts, 0-10 parts of acrylamide, 60-150 parts of vinyl acetate, 80-120 parts of water-soluble silicone oil, 1-5 parts of sodium polyacrylate. This product is a milky white liquid with good environmental protection ability, non-toxic and non-polluting, especially suitable for offshore drilling.

Description

technical field [0001] The invention belongs to the technical field of drilling fluid, and relates to a coated flocculant for drilling fluid. The product is a milky white fluid, has good environmental protection ability, is non-toxic and non-polluting, and is especially suitable for marine drilling. Background technique [0002] Drilling fluid plays a very important role in oil drilling engineering. At present, the coarse dispersion drilling fluid system is widely used in drilling operations, but the current drilling fluid system has the following disadvantages: the addition of a large amount of inorganic salts affects the rheology and fluid loss of the drilling fluid itself; and there is radioactivity Interference of ions on electrical measurements, etc. [0003] At present, the commonly used oilfield drilling fluid system uses polyacrylamide, with a high molecular weight of 6-14 million. This high-molecular-weight coating agent increases the viscosity of the system when u...

AI Technical Summary

Problems solved by technology

At present, the coarse dispersion drilling fluid system is widely used in drilling operations, but the current drilling fluid system has the following disadvantages: the addition of a large amount of inorganic salts affects the rheology and fluid loss of the drilling fluid itself; and there is radioactivity Interference of ions on electrical measurements, etc.

[0003] At present, the commonly used oilfield drilling fluid system uses polyacrylamide, with a high molecular weight of 6-14 million. This high-molecular-weight coating agent increases the viscosity of the system when used, and is prone to excessive flocculation, resulting in mud filtration. When the amount increases, the stability of the mud is insufficient, and due to the large molecular weight, the particles or powdery coating agents tend to form insoluble agglomerates when they dissolve, and the complete dissolution takes a long time and the speed is slow, which seriously affects the construction progress

At the same time, there are a lot of silicon hydrogen groups on the surface of shale, drilling cuttings and clay, and the coating effect needs to be further strengthened

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