发明名称 |
METHOD AND APPARATUS FOR SUBSOIL DRILLING |
摘要 |
METHOD AND APPARATUS FOR SUBSOIL DRILLING A method and apparatus for creating an underground bore hole employing a steerable boring head at the end of a remotely driven drill string. The boring head, preformed at an angle to the longitudinal axis of the trailing pipe string to bore along a curvilinear path is straightened by increasing the pressure of the fluid within the drill string above a predetermined range to enable drilling along a linear path. Subsequent reduction of the fluid pressure to normal drilling pressure returns the boring head to its former state along a resumption of a curvilinear drill path.
|
申请公布号 |
CA2056948(A1) |
申请公布日期 |
1992.09.16 |
申请号 |
CA19912056948 |
申请日期 |
1991.12.04 |
申请人 |
UNDERGROUND TECHNOLOGIES, INC. |
发明人 |
KINNAN, FRANK R. |
分类号 |
E21B7/04;E21B7/06;E21B7/18;(IPC1-7):E21B7/18 |
主分类号 |
E21B7/04 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|