High-temperature drilling fluid forced cooling system

Abstract

The invention discloses a high-temperature drilling fluid forced cooling system. The high-temperature drilling fluid forced cooling system comprises a semiconductor refrigeration system, a secondary refrigerant cooling tank, a mud cooling pool, a mud thermal power generating pool and a storage battery system. The cold side of the semiconductor refrigeration system is attached to the secondary refrigerant cooling tank, and a secondary refrigerant is circularly conveyed between the secondary refrigerant cooling tank and the mud cooling pool through two pipelines. A spiral tube heat exchanger isdisposed in the mud cooling pool. The spiral tube heat exchanger is connected with a drill pipe and the mud power generating pool through pipelines, and the mud power generating pool is connected witha wellbore annulus through a pipeline. All the pipelines are provided with pumps, valves and temperature sensors. The outer wall of the mud power generating pool is pasted with semiconductor thermoelectric power generation components, the semiconductor thermoelectric power generation components are connected with the storage battery system through a circuit, and the storage battery system is connected with the semiconductor refrigeration system through a circuit. The high-temperature drilling fluid forced cooling system can reduce the temperature of a borehole, improves the stability of the borehole, and enables logging instruments to achieve better operability.

Description

technical field [0001] The invention relates to the field of petroleum drilling, in particular to a high-temperature drilling fluid forced cooling system. Background technique [0002] With the development of oil drilling technology, deep well, ultra-deep well, high temperature and high pressure well technology has become the key aspects of oil drilling. During the drilling process, the formation heat will be continuously transferred to the wellbore, and the formation temperature increases with the depth. The 100m geothermal gradient is about 3°C. Taking the 6000-7000m deep well as an example, the bottom hole temperature can exceed 200°C. The main production area of ​​oil and gas reserves in my country The temperature of deep reservoirs in Songliao, Bohai Bay, Tarim, Junggar and Sichuan Basin is as high as 200-260°C. Excessive bottomhole temperature not only affects the performance of drilling fluid, but also reduces the service life of downhole tools and affects the normal u...

AI Technical Summary

Problems solved by technology

During the drilling process, the formation heat will be continuously transferred to the wellbore, and the formation temperature increases with the depth. The 100m geothermal gradient is about 3°C. Taking the 6000-7000m deep well as an example, the bottom hole temperature can exceed 200°C. The main production area of ​​oil and gas reserves in my country The temperature of deep reservoirs in Songliao, Bohai Bay, Tarim, Junggar and Sichuan Basin is as high as 200-260°C. Excessive bottomhole temperature not only affects the performance of drilling fluid, but also reduces the service life of downhole tools and affects the normal use of measuring instruments. and drilling safety

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