METHOD FOR TRACER (MARKER) ANALYSIS OF BOTTOMHOLE ZONE OF HORIZONTAL WELLS Russian patent published in 2024 - IPC E21B47/11 

FIELD: mining.

SUBSTANCE: invention relates to mining, namely to methods of oil and gas wells survey using markers or indicators. Method for tracer analysis of bottomhole zone of horizontal wells consists in in that through models of rock structures of oil and gas bearing formation fluid containing tracer is pumped, and performing periodic measurements of the molar concentration of the tracer in the liquid pumped through the model, for each model. Dependence of the change in the concentration of the tracer in the liquid on time for each model is depicted as a curve. Further, liquid containing tracer is pumped into oil-and-gas-bearing formation of bottom-hole zone of well borehole, and periodic measurements of molar concentration of tracer in liquid received from oil-and-gas-bearing formation of bottom-hole zone of horizontal section of well borehole. Dependence of the change in the concentration of the tracer in the received liquid on time is plotted in the form of a curve. Further, the shape of the obtained curve is compared with those of curves obtained for models of rock structures of the oil and gas bearing formation. If the shape of the curve obtained for the oil and gas bearing formation of the bottomhole zone of the horizontal section of the wellbore coincides with the shape of the curve of one of the models of the oil and gas bearing formation by 90% or more, rock structure of oil and gas bearing formation of bottomhole zone of horizontal section of well shaft is considered to be similar to rock structure of model of oil and gas bearing formation.

EFFECT: high accuracy of determining the structure of the rock of the oil and gas bearing formation of the bottomhole zone of the horizontal section of the well.

8 cl, 5 dwg, 5 tbl