DETERMINATION OF UNCONFINED COMPRESSIVE STRENGTH FROM DRILLING DATA AND DRILL BIT PARAMETERS

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(11)

EP 4 459 096 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	08.01.2025 Bulletin 2025/02

(43)	Date of publication A2:
	06.11.2024 Bulletin 2024/45

(21)	Application number: 24173893.9

(22)	Date of filing: 02.05.2024

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International Patent Classification (IPC):

E21B 44/00^(2006.01)
E21B 7/06^(2006.01)
E21B 43/26^(2006.01)

E21B 49/00^(2006.01)
E21B 33/134^(2006.01)

(52)	Cooperative Patent Classification (CPC):
	E21B 44/00; E21B 2200/20; E21B 49/003; E21B 7/068; E21B 43/26

(84)	Designated Contracting States:
	AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR
	Designated Extension States:
	BA
	Designated Validation States:
	GE KH MA MD TN

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Priority:

03.05.2023 US 202363499820 P

(71)	Applicant: Varel International Ind., LLC
	Kingwood, TX 77339 (US)

(72)	Inventors:
	DEEN, Carl Aron Choctaw (US) MCALLISTER, Duncan Michael Edmond (US) SCHNURIGER, Matthew Aaron Odessa (US) BENNETT, Stefani Jade Humble (US)

(74)	Representative: Murgitroyd & Company
	Murgitroyd House 165-169 Scotland Street Glasgow G5 8PL Glasgow G5 8PL (GB)

(54)	DETERMINATION OF UNCONFINED COMPRESSIVE STRENGTH FROM DRILLING DATA AND DRILL BIT PARAMETERS

(57) A method for monitoring a drilling operation includes: providing a drill bit for drilling a wellbore into a geological formation using a drilling motor for rotating the drill bit; determining depth of cut (DOC) of the drill bit and torque exerted on the drill bit by the drilling motor using parameters measured while drilling the wellbore; simulating drilling of a hypothetical wellbore using a hypothetical drill bit similar or identical to the drill bit and determining a function that provides strength of a hypothetical geological formation from the DOC of the hypothetical drill bit and the torque exerted on the hypothetical drill bit; and determining strength of the geological formation using the function and the determined DOC and the torque.

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