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2 321 737

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IPC

E21B44/06(2006-01-01)

(21) (22)

Application

2006124726/03, 2006-07-10

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Start date

2006-07-10

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Actual filing date

2006-07-10

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Published

2008-04-10

(72)

Inventor

Ishemguzhin Evgenij IzmajlovichNadyrshin Ruslan FaridovichZinatullina Ehl'Mira JakupovnaImaeva Ehmma ShaukatovnaZotov Aleksej NikolaevichIshemguzhin Igor' Evgen'EvichAtnagulov Al'Bert Rashitovich

(73)

Holder

Gosudarstvennoe Obrazovatel'Noe Uchrezhdenie Vysshego Professional'Nogo Obrazovanija Gosudarstvennyj Neftjanoj Tekhnicheskij Universitet"

METHOD TO DETERMINE ROCK-CUTTING TOOL OPERABILITY Russian patent published in 2008 - IPC E21B44/06

Abstract RU 2321737 C1

FIELD: well drilling, particularly to control oil and gas well drilling parameters during well drilling with hydraulic downhole motors.

SUBSTANCE: method involves measuring fluctuation of axial load applied to drilling bit; selecting current operability criteria; setting reference operability criteria values and comparing current operability criteria and reference ones to determine rock-cutting tool operability. Fractal dimensions are calculated with the use of plotted phase curves representing axial load when rock-cutting tool is in current condition D₁ and initial drilling time when rock-cutting tool operates in optimal mode D₂. Drilling-tool workability criterion is equal to γ=D₁/D₂. Reference γ values are determined for drilling bit having maximal wear.

EFFECT: increased accuracy of working rock-cutting tool operability determination due to recording of chaotic axial load fluctuation to be applied to drilling bit.

1 ex, 2 dwg

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RU 2 321 737 C1

Authors

Ishemguzhin Evgenij Izmajlovich

Nadyrshin Ruslan Faridovich

Zinatullina Ehl'Mira Jakupovna

Imaeva Ehmma Shaukatovna

Zotov Aleksej Nikolaevich

Ishemguzhin Igor' Evgen'Evich

Atnagulov Al'Bert Rashitovich

Dates

2008-04-10—Published

2006-07-10—Filed