Improvement of Operational Methods for Research of Offshore Search and Evaluation and Exploration Wells (on the Example of Offshore Fields in the Caspian Sea)

Summary "Modern methods of well flow test in open borehole include a complex of interrelated technologies which differ in theoretic basis and implementation. They are aimed at reliable oil and gas reserve estimation, enhancement of geological informativity for prospecting and exploration wells and at choosing of well lower completion, putting of wells into operation and field development optimization while testing of development wells. The work is aimed at enhancement of rapid test methods informativity both at exploration and field development stages. The application of modern well flow tests in open borehole allows undertaking the following tasks: – simple pressure measurements at different depths; – determination of reservoir pressure at each point of measurement; – determination on depth and interval pressure gradient; – gas-oil / gas-water / oil-water contact diagnostics; – potential productivity estimation and flow rate forecast; – recovery of representative reservoir fluid samples. The novelty consists in the development of production logging both in appraisal and exploration wells by means of registration of long-term PBC after formation testing at different rates of pump operation; in algorithm of complex on-line interpretation of study results."