Drilling system and method and application thereof

Abstract

The invention relates to a drilling system and method and application thereof in the field of oil exploration and development. The drilling system comprises a cold fluid circulation pipeline, a continuous oil pipe and a fluid temperature control cavity. According to the method, drilling fluid in the fluid temperature control cavity is cooled through cold fluid in a heat exchange pipe; the fluid temperature control cavity is designed to be of an organ pipe structure, the drilling fluid forms a strong natural vibration cavitation effect in the cavity, the natural vibration cavitation low-temperature drilling fluid is sprayed out of a nozzle at a high speed to act on dry and hot rock at the bottom of a well, and micro cracks are generated on the surface of the rock under the action of tensile stress. Meanwhile, the drilling fluid forms strong cavitation vortex flow under the action of natural vibration cavitation, cavitation is broken to generate a strong destructive effect, and the rock breaking capacity is further improved. The problems that a dry and hot rock drilling machine is low in drilling speed, high in drilling cost and short in service life of downhole tools and instruments are solved, and efficient development and utilization of dry and hot rock resources in China can be effectively guaranteed.

Description

technical field [0001] The invention relates to the field of hot dry rock drilling for petroleum exploration and development, and more specifically, relates to a drilling system and its method and application. Background technique [0002] Hot dry rock refers to an abnormally high-temperature rock mass that does not exist or contains only a small amount of fluid inside, and whose temperature is between 150 and 650 °C, which is dense and impermeable. my country has a huge amount of hot dry rock resources, and the total amount of hot dry rock resources buried at a depth of 3-10 km can reach 2.5×10 25 J standard calories, equivalent to 860 x 10 12 t standard coal, calculated on the basis of 2% recovery rate, is equivalent to the total energy consumption in my country in 2018 (46.2×10 8 3700 times of t). In addition, no waste water, CO 2 and particle pollutants, which is conducive to the protection of the natural environment. Therefore, the efficient and economical developm...

AI Technical Summary

Problems solved by technology

However, after the low-temperature liquid nitrogen is ejected from the drill nozzle, the pressure drops rapidly and the volume expands sharply. Under the action of Joule-Thomson, the temperature of the drill nozzle drops sharply and freezes, which greatly affects the liquid nitrogen-assisted rock breaking effect.

Liquid nitrogen is quickly gasified into nitrogen at the bottom of the well, and the cuttings are carried to the ground under the action of nitrogen, and the effect of carrying large particles of cuttings is poor

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