Well, testing is the act of collecting data from a live well in order to assess the behavior of the reservoir in real-time. This procedure gives data on pressure control, absorbency, fluid characterization, reservoir characterization, and other topics. Both onshore and offshore oil/gas field discovery, appraisal, and production activities rely heavily on well-testing services. U.S. BOP Testing Services are divided into four categories: downhole testing, surface well testing, reservoir sampling, and real-time well testing.