DRILLING METHOD AND DRILLING APPARATUS

• Main Authors: MIZUNO KENTA, OKADA KAZUNARI, HIRAI MASATOSHI, SUZUKI TAKESHI, HARA MINORU, YOKOI TSUTOMU
• Format: Patent
• Language: English; Japanese
• Published: 06.12.2018
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

To grasp a drilling position more accurately and to perform drilling accurately.SOLUTION: A drilling method according to an embodiment of the present invention includes drilling locus measurement steps (S130, S180), posture measurement steps (S140, S190), and adjustment steps (S210-S260). In the drilling locus measurement steps, a current is caused to flow through a drill pipe to generate a magnetic field, and an absolute position (drilling locus) of the drill pipe is measured from a reception result of the magnetic field, so that the position of the drill pipe can be grasped more accurately. In the posture measurement steps, the rotation angle and the pitching angle of a distal end head are measured by an inclinometer installed inside the distal end head. In the adjustment steps, the rotation angle position of the distal end head is adjusted so that the drilling position approaches the planned arrival position and is corrected based on the measurement results in the drilling locus measurement steps and the posture measurement steps. In this way, by using the position information of the drill pipe together with the posture information of the distal end head, drilling can be performed with high accuracy.SELECTED DRAWING: Figure 3 【課題】削孔位置をより正確に把握し、削孔を精度よく行う。【解決手段】本発明の実施の形態に係る削孔方法は、削孔軌跡計測工程（Ｓ１３０、Ｓ１８０）と、姿勢計測工程（Ｓ１４０、Ｓ１９０）と、調整工程（Ｓ２１０〜Ｓ２６０）とを含んでいる。削孔軌跡計測工程では、削孔管に電流を流して磁界を発生させ、その磁界の受信結果から削孔管の絶対位置（削孔軌跡）を計測することで、削孔管の位置をより正確に把握する。姿勢計測工程では、先端ヘッドの内部に設置した傾斜計により、先端ヘッドの回転角度とピッチング角度とを計測する。調整工程では、削孔軌跡計測工程及び姿勢計測工程での計測結果に基づいて、削孔位置が計画到達位置へと近づいて修正されるように、先端ヘッドの回転角度位置を調整する。このように、削孔管の位置情報と先端ヘッドの姿勢情報とを併用することで、削孔を精度よく行うことが可能となる。【選択図】図３