发明名称 |
Mud pressure control system |
摘要 |
A down-hole signal generator for a mud-pulse telemetry system comprises a flow constrictor defining a throttle orifice for the mud passing along a drill string, a throttling member displaceable with respect to a casing to modulate the mud pressure for the purpose of transmitting measurement data up the drill string, and a turbogenerator incorporating an electrical generator within the casing. The flow constrictor and casing form an integrated unit which is installed within a drill collar and is retrievable by drawing it up the inside of the drill string. The throttling member is displaced by a pump according to the torque required to drive the rotor of the generator which is dependent on the electrical load of the generator. The pump incorporates a rotary valve member which supplies the output of the pump to one or other side of a double-acting ram according as to whether the valve member is rotating with a first phase of rotation or a second phase of rotation. The phase of rotation is determined by a torque-sensitive actuator coupled to the valve member by a shaft and incorporating an escapement plate tiltable about an axis transverse to the shaft by a torque drive arm for driving the rotor.
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申请公布号 |
US4636995(A) |
申请公布日期 |
1987.01.13 |
申请号 |
US19850764167 |
申请日期 |
1985.08.09 |
申请人 |
NL SPERRY-SUN, INC. |
发明人 |
RUSSELL, MICHAEL K.;RUSSELL, ANTHONY W. |
分类号 |
E21B41/00;E21B47/12;E21B47/18;(IPC1-7):G01V1/40;E21C7/08 |
主分类号 |
E21B41/00 |
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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