WELL DRILLING TOOL, TOOL FOR EVALUATION OF PARAMETRES OF FORMATION AND EVALUATION METHOD OF PARAMETRES OF FORMATION BY MEANS OF WELL TOOL Russian patent published in 2010 - IPC E21B49/00 

FIELD: oil and gas industry.

SUBSTANCE: tool positioned in well shaft passing through underground formation includes evaluation tool of formation parametres and has fixed part, which is connected in working state to loaded drill pipe of well tool and intended to establish the interaction via fluid medium with underground formation, and removed part interconnected via fluid medium to fixed part, which is removed from it to the surface and intended to receive formation fluid medium from underground formation and containing many sampling chambers for sampling of formation fluid medium. Evaluation method of formation consists in the fact that there established is communication via fluid medium between fixed part of well drilling tool and the first part of formation, the first sample of formation fluid medium is drawn from formation to fixed part, the first sample of formation fluid medium is passed from fixed part to the first sampling chamber in removed part of well drilling tool, communication via fluid medium is interrupted between fixed part of well drilling tool and the first part of formation, communication via fluid medium is established between fixed part of well drilling tool and the second formation part, the second fluid medium sample is passed from fixed part to the second sampling chamber in removed part of well drilling tool and removed part of well drilling tool is removed to the surface, and thus, the first and the second samples of formation fluid medium in the first and the second sampling chambers are simultaneously removed to the surface.

EFFECT: providing sampling of formation fluid medium and its transportation to the surface without removal of well tool, operability of tool in heavy drilling conditions, sample protection against pollution and damage during transportation to the surface.

21 cl, 6 dwg