Follow-drilling plugging agent and its preparation method and use

Abstract

The invention provides a leak preventer along with drilling and the method for its preparation, relating to the field of additive of boring fluid. Such leak preventer along with drilling contains: a) plant fiber without colloid or lignin, 100 weight shares; b) lime carbonate with calcium carbonate for at least 90 weight percent, 10-60 weight shares; c) oil-soluble resin of oil-soluble ratio no less than 95 weight percent and softening point 50-250 Deg. C, 3-30 weight shares. The leak preventer along with drilling is prepared by equably mixing the disintegrated ingredients which contains there substances above. It has a remarkable effect of leak prevention, which can be mixed with boring fluid to prevent leak while drilling, needing not stop drilling or stop laboratory sifter, improving the drilling speed and saving the drilling cost. And it also can release stoppage in acid solvent, oil solvent and negative pressure, and protect the reservoir. The leak preventer along with drilling is easy to spread, extensive sources of the material, low cost, and convenient technique.

Description

technical field [0001] The invention relates to a drilling fluid treatment agent used in petroleum drilling engineering, and furthermore, relates to a plugging agent while drilling, its preparation method and its application in drilling fluid. Background technique [0002] At present, the technology adopted for the treatment of lost circulation at home and abroad is generally "equal emphasis on prevention and blockage". "Prevention" refers to preventive measures, mainly including predicting formation pressure gradient, balancing pressure drilling, using high-quality mud (well mud), aerated drilling fluid, etc. "Blocking" refers to plugging. In terms of plugging, there are no less than 40 kinds of plugging technologies at home and abroad, especially there are many plugging slurry formulas, and there are more than 500 kinds in the United States. Comparing the general technologies for the treatment of lost circulation in the United States, Romania, the Soviet Union and my coun...

AI Technical Summary

Problems solved by technology

The lost circulation agent provided by this patent also has the following problems: it is very easy to generate foam when used in drilling fluid; it affects the rheology of drilling fluid; only specific drilling fluid systems can be used; the formed plugging layer is relatively loose; Need to stop drilling

There are problems such as short and thin fibers, light density, high production cost, difficulty in mixing into mud, viscous vibrating screen, foaming, etc.

In particular, the vibrating sieve cannot be used in the plugging process, or if the vibrating sieve is used, the paste screen will run out of slurry, and it is necessary to add a defoamer to defoam, which will reduce the drilling speed and increase downhole accidents and mud costs.