Patent attributes
A downhole sampling tool includes a tool body defining an opening therein for drawing a formation fluid into the downhole sampling tool. At least one sampling vessel is carried in the tool body and is operatively coupled to the opening to receive the formation fluid therein. A closure member is selectively engageable with the opening to prohibit flow of the formation fluid through the opening, and a biasing mechanism is operably coupled to the closure member. The biasing mechanism biases the closure member into engagement with the opening and is responsive to an increase in hydraulic pressure on the exterior of the sampling tool to a predetermined threshold pressure to permit movement of the closure member away from the opening and permit flow of the formation fluid through the opening and into the sampling vessel.
