The conversation between human and AI assistant.
What are the main advantages and disadvantages of open hole and cased hole reservoir fluid sampling?
That makes sense. Now, can you explain what types of tools are used for each type of sampling?
Certainly. For open hole sampling, wireline formation testers (WFTs) are typically used to draw fluid samples from the unobstructed formation. On the other hand, for cased hole sampling, fluid samples are most commonly collected using drill stem tests (DSTs) which are performed on a string of tubing lowered into the wellbore.