METHOD FOR SELECTIVE SAMPLING OF RESERVOIR PRODUCTION OF ONE WELL Russian patent published in 2022 - IPC E21B43/14 

FIELD: selective sampling.

SUBSTANCE: invention relates to a method for selective sampling of reservoir production from a single well. The method for selective sampling of formation production of one well includes installation of at least one packer between the formations to isolate the formations from each other. The selection of the well fluid of the formation is carried out before replacing it with the production of the formation. A sample of formation production is brought to the surface for analysis. In successive secondary opening, the productivity of each of the layers to be opened is determined. Before the packer is lowered, the density of the well fluid is determined. As a packer, a hydrophobic gel composition is used with adhesion to the casing pipe material and a density equal to the density of the well fluid in the installation interval. The gel composition is used in a volume that ensures its thickness, sufficient isolation of the layers. The selection of well fluid opposite the corresponding formation is carried out with a productivity not exceeding the productivity of this formation in order to exclude the packer from shifting. Sampling of formation products is carried out by a sampler.

EFFECT: simplifying the process of selective sampling while maintaining sample quality.

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