Testing of the Osmotic Membrane Pressure Actuator (OMPA) principle for autonomous water choking
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This Master thesis is a part of OMPA (Osmotic Membrane Pressure Actuator) which Is initiated andpatented by Statoil ASA Porsgrunn research centre at Feb. 27, 2007 (US). The objective of the OMPA project is to develop a self regulating autonomous valve that can be used in oil wells. The work was completely carried out at Statoil research centre in Porsgrunn under the supervision of Lene Amundsen from Statoil and Professor Harald Asheim from Trondheim, NTNU. This project contains two parts. The first part is the literature study about inflow control devices, autonomous inflow control devices and osmotic processes. An overview of the available devices onthe market is presented. A selection of patents is briefly summarized. The second part is the experimental study. The objective of the study was to demonstrate the possibility of using osmotic pressure to actuate a piston in order to close a valve. For this purpose anexperimental rig was built at the Statoil Porsgrunn research centre laboratory. Experiments were carried out using ordinary tap water. During the analyses two kinds of forward osmosis membranes were used: GKSS Cellulose acetate and hydration cartridge (company name HTI) cellulose triacetate.To create the required osmotic pressure to actuate the piston two kind of salt solutions NaCl and KClwith different concentrations were used. The required osmotic pressures to actuate the piston were created by using two kinds of saltsolutions (NaCl and KCl) with different concentrations.