Results of the analysis of modern equipment for testing formations in oil and gas fields of the Caspian sea

The article considers in providing barrier between the production fluid and environment. Subsea test tree has 2 ball valves which can prevent blow out in case of abnormal pressure reachs to surface, also isolate well, unlatch and semi subor drill ship can relocate on safe zone. To control the operation of the formation tester, it is necessary to equip it with monometers located in separate sections of the formation tester system. When working with these formation testers, it was necessary to regularly obtain, over a certain period of time, the pressure values (both behind the column and inside) that arise during its operation, which presents certain difficulties, especially when operating this system in offshore conditions. The system has couple of unique features that will tie into the surface well test system and rig. The emergency shut down system is a vital part of the surface welltest equipment. It allows the flow of the well to be stopped in the event of problems occurring at surface and relocate platform into safe zone. Prior to running the equipment, testing should be carried out to allow hardware failures to be tested, including loss of trigger line pressure, loss of subsea electronic module, loss of enhanced data acquisition system surface card and loss of a human machine interface. These tests may be performed by physically disconnecting each device in turn and confirming the expected behavior. It is recommended that the testing should also include a test where the trigger line pressure is raised, triggerlLine rapid vent option enabled, and then the trigger line pressure reduced below the trigger pressure to initiate a triiger line rapid vent – this may be done without the valve mechanism.