Thermoelectric power generation type high-temperature drilling fluid cooling and circulating system

Abstract

A thermoelectric power generation type high-temperature drilling fluid cooling and circulating system comprises a refrigerating unit, a refrigerating unit pump, a first valve, a second valve, a cooling fluid loading box, a cooling fluid delivering pump, a heat exchanger, a steam-turbine generator, an electricity storage box, electric equipment, a condenser, a well, a drilling fluid pond, a first drilling fluid delivering pump and a second drilling fluid delivering pump; the first drilling fluid delivering pump is positioned between the well and the drilling fluid pond, and pumps the high-temperature drilling fluid upwards returning from the well to the drilling fluid pond; and the second drilling fluid delivering pump is positioned between the drilling fluid pond and the heat exchanger, and delivers the high-temperature drilling fluid to the heat exchanger. By the heat exchanger, the high-temperature drilling fluid and the cooling fluid are subjected to heat exchange, the exchanged cooling fluid becomes high-temperature and high-pressure gas which enters the steam-turbine generator to drive the generator to generate power, and the generated electric energy is stored in the electricity storage box and supplies power for the electric equipment. After the high-temperature drilling fluid becomes low-temperature drilling fluid by exchange through the heat exchanger, the low-temperature drilling fluid enters the well through a sixth pipeline.

Description

technical field [0001] The invention belongs to the technical field of drilling, and particularly relates to a thermoelectric power generation type high-temperature drilling fluid cooling circulation system, which utilizes a large amount of heat energy carried by the high-temperature drilling fluid returned to the earth's surface to generate electricity and simultaneously cools the drilling fluid in circulation. Background technique [0002] In recent years, with the continuous depletion of shallow resources and the continuous development of drilling technology, more and more deep wells, ultra-deep wells and wells with special techniques have been drilled. The bottom hole temperature of deep and ultra-deep wells can be as high as 200°C, generally exceeding 7000m drilling depth, and the temperature of the drilling fluid when returning to the ground is also above 90°C, which will carry a lot of heat. For example, according to the pump volume of 200L / min, the drilling fluid den...

AI Technical Summary

Problems solved by technology

The surface activity of the drilling fluid is reduced, high-temperature passivation occurs, the efficiency of the drilling fluid treatment agent is greatly reduced, and the thermal stability is lost. At the same time, the flow resistance of the drilling fluid is reduced, the viscosity is reduced, the chemical reaction in the drilling fluid is intensified, and the coalescence stability is reduced.

If it is not cooled in time, the performance of the drilling fluid will be severely damaged, causing frequent accidents in the well and affecting normal drilling

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