With the further exploration of oil and gas, we have to search for new resources which buried in deep strata, and most of the deep and ultra-deep wells are categorized in high-pressure/high-temperature (HPHT) wells. The problem of high temperature and the challenge to the existing downhole equipments are becoming increasingly prominent, where the drilling depth is severely restricted. The conventional measurement while drilling tools with common electronics will experience very high failure rates at these conditions.
One of the solutions is called the active cooling technology, which can transfer the heat from electronics system to downhole environment. By this way, the temperature control of downhole instrument circuit system is realized.
The active cooling technology is expounded in this paper, expecially about the principles and development status of each system. After evaluating and analyzing the characteristics of this technology, the function of heat transfer and constituent elements for the cooling system are summarized.
The study from this work demonstrates the future work for downhole cooling technology: large refrigeration capacity, small size, strong adaptability and modularization.
Number of Pages
H. Wang,Y. Ge, and L. Shi. Technologies in deep and ultra-deep well drilling: Present status, challenges and future trend in the 13th Five-Year Plan period (2016-2020) [J]. NATURAL GAS INDUSTRY, 2017, 37(4).
Bennett G.A. 1988, Active Cooling for Downhole Instrumentation: Preliminary Analysis and System Selection, Los Alamos National Laboratory, Mexico.
Sandeep, V.,Quincy, E.,: "Thermal Management of Electronics Used in Downhole Tools," paper SPE 159737. 2012 SPE Annual Technical Conference and Exposition, San Antoni.
W. Gao,K. Liu,E., : "Active Cooling Method for Downhole Systems in High Temperature Environment," paper SPE 195353. 2019 SPE Western Regional Meeting, San Jose.
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