DETERMINING TREATMENT FLUID COMPOSITION USING MINI-RESERVOIR MODEL Russian patent published in 2018 - IPC E21B47/00 E21B43/25 G01N21/85 

FIELD: measurement technology.

SUBSTANCE: group of inventions relates to methods for determining a candidate treatment fluid. Method comprises injecting a first candidate fluid into a porous structure of a first mini-reservoir model. Injecting a second candidate fluid into a porous structure of a second mini-reservoir model. Obtaining first visual data of the flow of the first candidate fluid through the first mini-reservoir model. Obtaining second visual data of the flow of the second candidate fluid through the second mini-reservoir model. Selecting a fluid for introduction into a subterranean formation based at least in part upon visual analysis of the first and second visual data. In another embodiment, the method comprises injecting a hydrocarbon fluid into the porous structure of a mini-reservoir model, injecting a second fluid into the porous structure. Determining saturation with the hydrocarbon fluid injected into the porous structure. Determining saturation with the second fluid injected into the porous structure. Oil recovery coefficient associated with the second fluid is determined based at least in part on the determined saturation with each of the hydrocarbon fluid and the second fluid. In said methods, each candidate fluid contains a surfactant.

EFFECT: technical result consists in easier selection of a suitable treatment fluid that contributes to an increase in hydrocarbon production.

31 cl, 16 dwg