FIELD: oil and gas industry.
SUBSTANCE: invention group relates to methods and devices for detection of downhole parametre in drilling environment at decreased hydrostatic pressure in borehole. Detection method of downhole parametre in drilling environment consists of implementation of downhole drilling at increased hydrostatic pressure in it, it is defined fracture, passing through the layer. Then it is implemented drilling of mentioned downhole at decreased hydrostatic pressure in it, selectively it is created identifier in the first fluid, running from the layer by mentioned downhole during the drilling at decreased hydrostatic pressure in it, identifier is detected in the first fluid. Additionally it is defined depth, where the first fluid from the layer arrives into the downhole. Drilling is resumed at decreased hydrostatic pressure in downhole. Tool by means of which there are realised mentioned methods is implemented with the ability of placement in drill column and contains part-marking device and identifier detector, separated from the mentioned device lengthwise the drilling column axis by distance d. Additionally tool additionally contains control circuit for activation of part-marking device for the purpose of selective labeling of the first fluid, running from the layer past the tool. Furthermore, tool contains processing medium, connected to the identifier detector for definition when labeled the first fluid runs past the identifier detector, and depth detection, on which it was find out the first fluid.
EFFECT: increasing of layers characteristics determination accuracy.
36 cl, 4 dwg
