GB766242A - Rotary expansible well drill bits - Google Patents
Rotary expansible well drill bitsInfo
- Publication number
- GB766242A GB766242A GB8462/55A GB846255A GB766242A GB 766242 A GB766242 A GB 766242A GB 8462/55 A GB8462/55 A GB 8462/55A GB 846255 A GB846255 A GB 846255A GB 766242 A GB766242 A GB 766242A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mandrel
- arms
- expand
- cutters
- expander
- 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
Links
- 230000003247 decreasing effect Effects 0.000 abstract 2
- 239000004576 sand Substances 0.000 abstract 2
- 238000005553 drilling Methods 0.000 abstract 1
- 239000012530 fluid Substances 0.000 abstract 1
- 238000005086 pumping Methods 0.000 abstract 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
- E21B10/34—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools of roller-cutter type
- E21B10/345—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools of roller-cutter type cutter shifted by fluid pressure
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
766,242. Borehole drill bit. KAMMERER, A. W. March 23,1955, No. 8462/55. Class 85. A rotary expandable well drilling bit for enlarging boreholes has a body, carrying expandable cutters, slidably splined and centralized on a mandrel connectable to a drill string and has hydraulic means to move said body axially of said mandrel to expand the cutters, the force expanding said cutters decreasing or remaining substantially constant as the cutters expand. The upper end of the mandrel 13 is connected to the drill string B and the lower end has flattened sides 83, Fig. 5, to allow the body 14 to slide axially on but not rotate relative to the mandrel. Arms 23 carrying roller cutters 27 are pivoted by pins 25 in slots in the bottom of the body 14. To expand the arms 23 fluid is pumped down the drill string B when the back pressure caused by the restriction 49 is transmitted through passages 77 to the under side of a shoulder 70 attached to the body 14 causing the body 14 to slide upwards relative to the mandrel 13 until the tapered bottom 18 of the body contacts the tapered end 17 of the mandrel so centralizing the body relative to the mandrel. During this movement an expander 38 on a tubular member 47, extending from the mandrel, co-operates with curved surfaces 30 on the arms 23 to expand them when they are held expanded by surfaces 32 on them contacting a surface 39 on the expander. The surface 30 is so curved that a common tangent 91 at the point of contact 90 of the surface 30 and the expander 38 makes a decreasing angle with the plane normal to the axis of the mandrel as the arms expand: When pumping stops and the string B and mandrel 13 are raised a shoulder 96 on the expander 38 contacts shoulders 97 on the arms 23 to contract them. If due to sand &c. in the annular space 22 below the shoulder 70 the arms 23 do not contract the mandrel is raised until the arms 23 contact a shoe F on the well casing D when sufficient upward force will cause snap rings 20,65,75 to contract in their V-shaped grooves and allow the shoulder 70 and a head 63 thereabove together with the sand to move upwards relative to-the body 14 allowing the arms to contract.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8462/55A GB766242A (en) | 1955-03-23 | 1955-03-23 | Rotary expansible well drill bits |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8462/55A GB766242A (en) | 1955-03-23 | 1955-03-23 | Rotary expansible well drill bits |
Publications (1)
Publication Number | Publication Date |
---|---|
GB766242A true GB766242A (en) | 1957-01-16 |
Family
ID=9852924
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8462/55A Expired GB766242A (en) | 1955-03-23 | 1955-03-23 | Rotary expansible well drill bits |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB766242A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2194571A (en) * | 1986-08-13 | 1988-03-09 | A Z Int Tool Co | Drilling apparatus and cutter |
GB2364079A (en) * | 2000-06-28 | 2002-01-16 | Renovus Ltd | Expandable roller drill bit |
EP1777365A1 (en) * | 2005-10-18 | 2007-04-25 | Services Petroliers Schlumberger SA | An expandable drill bit |
-
1955
- 1955-03-23 GB GB8462/55A patent/GB766242A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2194571A (en) * | 1986-08-13 | 1988-03-09 | A Z Int Tool Co | Drilling apparatus and cutter |
GB2194571B (en) * | 1986-08-13 | 1990-05-16 | A Z Int Tool Co | Drilling apparatus and cutter |
GB2364079A (en) * | 2000-06-28 | 2002-01-16 | Renovus Ltd | Expandable roller drill bit |
GB2364079B (en) * | 2000-06-28 | 2004-11-17 | Renovus Ltd | Drill bits |
EP1777365A1 (en) * | 2005-10-18 | 2007-04-25 | Services Petroliers Schlumberger SA | An expandable drill bit |
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