| 摘要 |
<p>A sidewall coring tool (20) provided which includes an elongated tool body, low speed high torque rotary coring bit apparatus (44) mounted within the elongated tool body and decentralizing arm apparatus (46, 46') mounted in the tool body on the side opposite the side of the body from which the rotary coring bit (44) is advanced, the decentralizing arm apparatus (46, 46') spaced above and below the location of the rotary coring apparatus (44) for deploying decentralizing arms from the tool body into contact with the bore hole walls. In addition, the sidewall rotary coring tool (20) further includes an electrical control circuit (34) disposed on the earth's surface and monitoring apparatus and circuitry disposed in the tool body and cooperating with the rotary coring bit apparatus (44) for permitting continuous surface visual indication of the travel of the coring bit (44) with respect to the tool body during the coring operation.</p> |
