Low-temperature air foam drilling device and method

Abstract

The invention discloses a low-temperature air foam drilling device and method. On the basis of a conventional air foam drilling process, foam liquid, air and air foam are refrigerated through a refrigeration system to form low-temperature air foam for drilling. The low-temperature air foam drilling device and method are suitable for drilling of a frozen soil stratum and a land natural gas hydrate layer. A low-temperature air foam drilling system comprises an air foam drilling system and the refrigeration system, wherein the refrigeration system comprises a foam liquid refrigeration system, an air refrigeration system and an air foam refrigeration system. Independent refrigeration and simultaneous refrigeration of the foam liquid, air and air foam are achieved, and refrigeration efficiency is improved. The low-temperature air foam drilling device and method can reduce the power required by the refrigeration system, reduces the influence on stratum temperature in the drilling process and is especially used in water-deficient areas and capable of reduce water consumption.

Description

technical field [0001] The invention relates to a low-temperature air foam drilling device and a drilling method, which are suitable for drilling in permafrost layers and terrestrial natural gas hydrate layers, especially in water-deficient areas. Background technique [0002] Permafrost is a soil medium that is extremely sensitive to temperature and contains abundant underground ice. At the same time, land permafrost is the area where terrestrial gas hydrate exists. my country is the third largest country in the world in terms of permafrost distribution. Soil drilling is very important for gas hydrate drilling and production in permafrost regions. [0003] Permafrost has rheological properties, and its long-term strength is much lower than the instantaneous strength characteristics. Due to these characteristics, if the temperature factor is ignored in permafrost drilling, the ice-cemented loose rock formation may lose its stability due to thermal loss of bonding, resulting ...

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Problems solved by technology

The deficiencies of the above equipment are as follows: ①The permafrost region is relatively short of water, which is not conducive to the preparation and replenishment of drilling mud; ②The specific heat of drilling mud is large, and the energy required for cooling is large, so it is not easy to cool; ③The thermal conductivity of drilling mud is high, Great influence on ground temperature

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