Mode parameters when using the technology of drilling wells with self-destructive foam "Composite SDF"

The purpose of this article is to study the parameters of the well drilling mode with closed-circuit bottomhole cleaning by the self-destructive foam. The study involves the review and analysis of the main technical and economic indicators of drilling when using foam as a cleaning agent under various geological conditions. The method of selecting a hard-alloy core-rock-breaking tool and its operating parameters when washing the bottomhole with foam is similar to the one used at drilling with the drilling mud. The need to achieve the maximum mechanical speed for specific mining and geological conditions is used as a key indicator of the drilling process. As a result, the justification is given to the regime parameters of coreless, hard-alloy, and diamond foam drilling and the drilling equipment is assembled. Recommendations have been developed for the efficient and rational use of the technology and technical tools for foam drilling. Their difference from the well drilling with flushing fluid is shown. The technological situations, possible complications and features of foam drilling in complicated conditions are described. Accident prevention measures are developed for various foam drilling conditions. The number of repeated cycles of using the originally prepared composite solution of a self-destructive foam with given concentration is substantiated. The use of the self-destructive foam when drilling wells by the recommended technology significantly increases the advance per bit, mechanical speed of drilling, helps to prevent a number of complications under well construction, as well as reduces the cost of each meter of drilling. Moreover, mud does not accumulate in the wellhead, which improves the environment setting of the drilling process.

self-destructive foam, drilling mode parameters, foam drilling in complicated conditions, recommendations on effective operation, closed-circuit circulation cycle, piping of foam producing equipment, foam generators, boosters, compressors, metering devices

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