| 摘要 |
<p>The wireline standoff 1 reduces wireline 2 sticking and key-seating. The wireline standoff comprises two finned half shells that clamp on the wireline with an internal safety brake that resists slippage during use. The wireline standoff ameliorates the effects of differential sticking and key-seating of the wireline by eliminating direct contact of the wireline to the borehole wall. In practice, an array of wireline standoffs are clamped onto the wireline to cover the open hole section being logged, resulting in a lower borehole contact area, lower applied pressure against the borehole wall, and lower rolling resistance when conveying the logging tools in or out of the hole. The brake may comprise two opposing cams 14 which grip the wireline 2.</p> |
