| 摘要 |
PROBLEM TO BE SOLVED: To provide a small-diameter and high-precision hole-curvature measuring apparatus which can be used by being inserted into an injection outer pipe, an upward borehole or the like, and a chemical-agent injection method using the apparatus. SOLUTION: In the hole-curvature measuring apparatus, a triaxial magnetic sensor 11, a triaxial acceleration sensor 13, a signal processing circuit part 12, a power supply circuit and a signal transmission circuit part 14 are internally provided in a cylindrical container 10 of a nonmagnetic material. In the structure of each magnetic sensor of the triaxial magnetic sensor, a rod-shaped core material, around which a coil is wound, is fixed by means of a silicon material, and further fixed in the state of being put into a holder so as to prevent a deviation in shaft arrangement from being caused by vibrations. In the chemical-agent injection method, a casing 1 is pulled out by erecting the injection outer pipe 2 after casing drilling; after that, hole curvature is measured by inserting the hole-curvature measuring apparatus 5 into the injection outer pipe 2; and subsequently, a chemical agent is injected by erecting an injection inner pipe with a packer into the injection outer pipe 2. COPYRIGHT: (C)2006,JPO&NCIPI
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