PRESSURIZED LIQUID DRIVEN DOWNHOLE DRILLING MACHINE WITH A DEVICE FOR SOFT START FROM A FLUSH POSITION AND IMPACT PISTON MAKING PART OF SUCH A DOWNHOLE DRILLING MACHINE - Patent 4540487

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EP 4 540 487 A1

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(43)	Date of publication:
	23.04.2025 Bulletin 2025/17

(21)	Application number: 23824324.0

(22)	Date of filing: 12.06.2023

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International Patent Classification (IPC):

E21B 4/14^(2006.01)

(52)	Cooperative Patent Classification (CPC):
	E21B 4/14

(86)	International application number:
	PCT/SE2023/050587

(87)	International publication number:
	WO 2023/244157 (21.12.2023 Gazette 2023/51)

(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:
	KH MA MD TN

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Priority:

17.06.2022 SE 2250739

(71)	Applicant: LKAB Wassara AB
	141 22 Huddinge (SE)

(72)	Inventor:
	EGERSTRÖM, Fredrik 131 48 Nacka (SE)

(74)	Representative: Zacco Sweden AB
	P.O. Box 5581 Löjtnantsgatan 21 114 85 Stockholm 114 85 Stockholm (SE)

(54)	PRESSURIZED LIQUID DRIVEN DOWNHOLE DRILLING MACHINE WITH A DEVICE FOR SOFT START FROM A FLUSH POSITION AND IMPACT PISTON MAKING PART OF SUCH A DOWNHOLE DRILLING MACHINE