DOWNHOLE TESTING METHOD IN OPEN HOLE Russian patent published in 2017 - IPC E21B43/10 E21B49/08 E21B43/14 E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: according to the method, the well bore promising interval is drilled. By the combination of geological, technical and geophysical information determine the location of promising reservoir. Lower the liner-filter at the transport string to keep the well bore walls stability. The liner-filter is formed from the number of sections, each of which consists of the casing pipes subsequently connected between each other, well strainers and external liner packers. The liner-filter bottom is equipped with the shoe with back valve. The liner-filter is formed with the possibility to use the test tool arrangement with one or two packers for testing of all reservoirs in directions from below upwards or from top to bottom, respectively. Fasten the liner-filter in the casing string by means of the suspension device. Wash the well through the shoe with the back valve. The bottomhole fluid is pumped into the interval of the promising reservoirs. Separate the reservoirs with the help of the external liner packers. Lower the test tools set on the pipes. Create the depression on the reservoir and induce the reservoir fluid inflow. Flow the well in order to clean the bottomhole formation zone. Carry out the gas hydrodynamic investigations on the steady-state filtration modes. Select the depth and the wellhead samples of the reservoir fluid. Remove the test tools set. The investigated reservoir is squeezed with the water. After that, the water is replaced by the process solution. The following reservoirs are tested in the similar way. After testing of all reservoirs, interpreting the records of subsurface tools and the reservoir fluid samples analysis, determine the productive reservoirs, that give the industrial inflow. The well is prepared for pilot production.

EFFECT: increase of the method effeciency.

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