METHOD FOR TAKING DEEP SAMPLES OF FORMATION OIL IN WELL WHEN TESTING AND COUPLING FOR DIRECTING FLOW OF FORMATION FLUID FOR ITS IMPLEMENTATION Russian patent published in 2017 - IPC E21B49/08 E21B43/12 

FIELD: oil and gas industry.

SUBSTANCE: in order to implement the method, a tubing string equipped with a mounting nipple for installation of sampling equipment and the coupling for directing the flow of formation fluid at the tubing bottom are lowered into the well. After depression is created, the evaluation of inflow rate and presence of oil in the inflow is carried out. The time required for oil to fill the tubing below the nipple is calculated by the inflow rate, and the operation time of the sampler is determined. The method includes running equipment consisting of a mandrel for hermetic seating into the seat nipple on the tubing of shut-off valve together with the sampler and a deep self-contained thermomanometre. Air-tight fitting of equipment into the seat nipple is performed, thus shutting-off the tubing string by the plug-in equipment. This creates conditions for accumulation and selection of depth sample of formation oil in the well in close proximity to the formation top. The formation oil is directed through the coupling for directing the flow in drop-jet form at low depression into the tubing string space, the sample is separated and accumulated in the rated period under the shut-off valve and the deep sample of the formation oil is taken out by the sampler installed together with the shut-off valve.

EFFECT: providing sampling of representative samples of formation oil, the application of which is possible at non-flowing test facilities.

2 cl, 3 dwg, 1 tbl