Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along...
Patent
1997-01-31
1999-03-02
Tsay, Frank S.
Boring or penetrating the earth
Means traveling with tool to constrain tool to bore along...
175 74, 175256, E21B 704
Patent
active
058758593
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention is generally directed to a controlling device and constituent components thereof to control the drilling direction of a drill bit which is typically employed for oil and gas wells.
BACKGROUND ART
A drilling device is, in general, employed for the purposes of drilling holes to collect underground resources or for civil engineering construction. In particular, a rotary type drilling device is a typical type thereof to drill efficiently a well conduit which is located at an extensive depth to a certain level of the stratum, to collect underground liquid resources including petroleum, natural gas, or geothermal vapor. For the aforementioned type of drilling device, it is indispensable to adapt the controlling device to be equipped at the distal end portion of said drilling device to control the moving direction of the drill bit so that the drilling bit can deviate when it faces a hard rock plate, resulting in the drilling operation proceeding efficiently without any undesired interruption. Furthermore, in a case when the drilling direction misses its aiming direction due to unexpected causes, it is also necessary to employ a controlling device at the distal end portion of the drilling device to correct the drilling direction to the original target direction.
Conventionally, several controlling mechanisms which are adapted to the rotary type drill bit have been proposed to correct the drilling direction, including those disclosed in Japan Patent Application Laid-Open No. Sho 57-21695, Japan Patent Application Laid-Open No. Sho 57-100290 and Japan Patent Application Laid-Open No. Sho 58-210300. However, the controlling mechanism disclosed in any one of the aforementioned patents is unable to control the drilling direction in all directions. Moreover, the controlling mechanism in said prior arts was complicated. These are disadvantages associated with the conventional types of devices for controlling the drilling direction.
Recently, another controlling, mechanism has been proposed in a disclosure of the Japan Patent. Application Laid-Open No. Hei 4-76183. The proposed mechanism consists principally of a plurality of the hollow-type harmonized reduction gear, a plurality of the eccentric rotating component equipped with an eccentric hollow portion which is connected to respective outputs of said hollow-type harmonized reduction gear and rotates in an eccentric manner with respect to a rotating shaft of each reduction gear, and a rotating shaft for the drill bit which is equipped at the drilling device in such a manner that said drill bit is inserted through the hollow portion of said hollow-type harmonized reduction gear and the eccentric hollow portion of the eccentric rotating component. The above structures enable the rotating shaft to change direction and location approximately along the direction of a central axial line of the shaft due to a restricting action of the inner peripheral surface of the eccentrically rotating eccentric hollow portion.
Furthermore, yet another controlling mechanism (Japan Patent Application Laid-Open No. Hei 5-149079) has been proposed. The proposed controlling mechanism comprises (1) first and second hollow-type harmonized reduction gears which are provided co-axially to each other, (2) a first ring-formed component which is located in a co-axial manner with respect to said first hollow-type harmonized reduction gear and rotates by said reduction gear, and (3) a second ring-formed component which is coaxially located with respect to said second hollow-type harmonized reduction gear and rotates by said reduction gear. Ring-formed end portions of said first and second ring-formed components overlap each other to intake a relative rotation possible. The end region of the thus overlapped portion is defined at the slant surface which is inclined with a certain angle. A rotating shaft for the drilling bit is inserted through a hollow portion of said first and second ring-formed components. By rotating relatively these first and second ring-form
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Ikeda Akio
Shano Koetsu
Japan National Oil Corporation
Tsay Frank S.
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