FR887242A - Drill bit working in steps for rotary drilling - Google Patents

Drill bit working in steps for rotary drilling

Info

Publication number
FR887242A
FR887242A FR887242DA FR887242A FR 887242 A FR887242 A FR 887242A FR 887242D A FR887242D A FR 887242DA FR 887242 A FR887242 A FR 887242A
Authority
FR
France
Prior art keywords
steps
drill bit
rotary drilling
bit working
working
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FU R BERGBAU und HU TTENBEDARF
Original Assignee
FU R BERGBAU und HU TTENBEDARF
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FU R BERGBAU und HU TTENBEDARF filed Critical FU R BERGBAU und HU TTENBEDARF
Application granted granted Critical
Publication of FR887242A publication Critical patent/FR887242A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/28—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with non-expansible roller cutters
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/36—Percussion drill bits
    • E21B10/40—Percussion drill bits with leading portion
FR887242D 1941-10-31 1942-10-26 Drill bit working in steps for rotary drilling Expired FR887242A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE887242X 1941-10-31

Publications (1)

Publication Number Publication Date
FR887242A true FR887242A (en) 1943-11-08

Family

ID=6833688

Family Applications (1)

Application Number Title Priority Date Filing Date
FR887242D Expired FR887242A (en) 1941-10-31 1942-10-26 Drill bit working in steps for rotary drilling

Country Status (1)

Country Link
FR (1) FR887242A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2681207A (en) * 1949-07-18 1954-06-15 Spacek William Warren Well drilling apparatus
US2703698A (en) * 1951-09-17 1955-03-08 William J B Westerman Counterboring rotary drill

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2681207A (en) * 1949-07-18 1954-06-15 Spacek William Warren Well drilling apparatus
US2703698A (en) * 1951-09-17 1955-03-08 William J B Westerman Counterboring rotary drill

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