JPH047277Y2 - - Google Patents
Info
- Publication number
- JPH047277Y2 JPH047277Y2 JP1986025076U JP2507686U JPH047277Y2 JP H047277 Y2 JPH047277 Y2 JP H047277Y2 JP 1986025076 U JP1986025076 U JP 1986025076U JP 2507686 U JP2507686 U JP 2507686U JP H047277 Y2 JPH047277 Y2 JP H047277Y2
- Authority
- JP
- Japan
- Prior art keywords
- passage
- muddy water
- casing
- drill pipe
- pressure
- 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
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
- Earth Drilling (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986025076U JPH047277Y2 (zh) | 1986-02-25 | 1986-02-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986025076U JPH047277Y2 (zh) | 1986-02-25 | 1986-02-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62138797U JPS62138797U (zh) | 1987-09-01 |
| JPH047277Y2 true JPH047277Y2 (zh) | 1992-02-26 |
Family
ID=30824889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986025076U Expired JPH047277Y2 (zh) | 1986-02-25 | 1986-02-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH047277Y2 (zh) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4831862A (zh) * | 1971-08-30 | 1973-04-26 | ||
| JPS57178090A (en) * | 1981-04-04 | 1982-11-02 | Christensen Inc | Apparatus for transmitting deta to ground level from inside of bore hole during work of boring apparatus |
-
1986
- 1986-02-25 JP JP1986025076U patent/JPH047277Y2/ja not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4831862A (zh) * | 1971-08-30 | 1973-04-26 | ||
| JPS57178090A (en) * | 1981-04-04 | 1982-11-02 | Christensen Inc | Apparatus for transmitting deta to ground level from inside of bore hole during work of boring apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62138797U (zh) | 1987-09-01 |
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