Nested thermally insulated containers for improved heat transfer reduction

A well intervention tool, comprising:

• a pressure resistant housing;
• a nested, vacuum insulated container comprising an outer vacuum insulated enclosure comprising a first double wall enclosure having at least one open longitudinal end and a closed longitudinal end, an annular space between an inner wall and an outer wall of the first double wall enclosure being evacuated, the open end of the first double wall enclosure oriented in a first direction and an inner vacuum insulated enclosure disposed within the outer vacuum insulated enclosure and comprising a second double wall enclosure in a U shape having an open longitudinal end and a closed longitudinal end, an annular space between an inner wall and an outer wall of the second double wall enclosure being evacuated, the open end of the second double wall enclosure oriented in a second direction opposed to the first direction;
• and
• a device to be thermally isolated from ambient environment outside the pressure resistant housing disposed within an interior of the inner vacuum insulated enclosure.