发明名称 |
HYDRAULIC CONTROL OF DRILL STRING TOOLS |
摘要 |
A drill string tool has a control mechanism to switch the tool between an inactive condition and an active condition in response to operator-performance of a predefined trigger sequence comprising variations in a drilling fluid pressure differential. The trigger sequence comprises multiple cycles of (a) raising the predefined trigger sequence into, but not above, a predefined pressure range, and (b) lowering the predefined trigger sequence below a lower threshold of the pressure range. Raising of the pressure difference above an upper pressure range threshold results in automatic interruption and resetting of the predefined trigger sequence. |
申请公布号 |
NO20160287(A1) |
申请公布日期 |
2016.02.18 |
申请号 |
NO20160000287 |
申请日期 |
2016.02.18 |
申请人 |
HALLIBURTON ENERGY SERVICES, INC. |
发明人 |
RINGGENBERG PAUL |
分类号 |
E21B10/32;E21B23/00;E21B23/06 |
主分类号 |
E21B10/32 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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