| 摘要 |
<p>An apparatus and method are disclosed for actively cooling instrumentation, such as electronic circuits, in a downhole tool. This apparatus includes a compressor, condenser and expansion valve connected in circuit to an evaporator or heat exchanger. The evaporator/heat exchanger includes an inner container positioned about the instrumentation, and an outer chamber positioned about the inner container. A cooling fluid absorbs heat from the instrumentation as it passes through the inner container. The fluid then passes into the outer container where it may absorb heat from the wellbore. The heated fluid is then pressurized via the compressor, condensed into liquid via the condenser and selectively released back into the internal container upon cooling via the expansion valve. The fluid continuously circulates through the system whereby the instrumentation is insulated from heat and/or cooled.</p> |
