Downhole power generation using a mud operated pulser
First Claim
1. A mud pulser system, comprising:
- a piston assembly movably disposed within a housing and including a power piston, the piston assembly being configured to move in response to pressure from a fluid flow;
a control valve having an open state, in which the power piston receives the fluid flow, and a closed state, in which fluid flow is prevented from interacting with the power piston;
a magnet disposed on one of the housing and the piston assembly; and
a coil disposed on the other of the housing and the piston assembly, wherein the magnet is configured to displace relative to the coil in response to movement of the piston assembly within the housing, such that relative movement of the magnet and the coil generates electrical energy.
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Accused Products
Abstract
The present disclosure relates to generating electricity downhole using a mud-operated pulser. A disclosed example embodiment of a mud pulser system includes a piston assembly movably disposed within a housing, comprising a power piston, and configured to move in response to a pressure from a fluid flow, a control valve having an open state, in which the power piston receives the fluid flow, and a closed state, in which the power piston does not receive the fluid flow, a magnet disposed on the housing or the piston assembly, and a coil disposed on the housing or the piston assembly, wherein the magnet is configured to displace relative to the coil in response to movement of the piston assembly within the housing, such that relative movement of the magnet and the coil generates electrical energy.
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Citations
19 Claims
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1. A mud pulser system, comprising:
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a piston assembly movably disposed within a housing and including a power piston, the piston assembly being configured to move in response to pressure from a fluid flow; a control valve having an open state, in which the power piston receives the fluid flow, and a closed state, in which fluid flow is prevented from interacting with the power piston; a magnet disposed on one of the housing and the piston assembly; and a coil disposed on the other of the housing and the piston assembly, wherein the magnet is configured to displace relative to the coil in response to movement of the piston assembly within the housing, such that relative movement of the magnet and the coil generates electrical energy. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of generating electrical power downhole with a mud pulser system, comprising:
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receiving, by the mud pulser system, a first flow from an upstream region through a flow line orifice and past a poppet of a piston assembly to a downstream region; receiving a second flow from the upstream region to a control valve; opening the control valve, such that the piston assembly moves in a first axial direction; closing the control valve, such that the piston assembly moves in a second axial direction, opposite the first axial direction; and generating electrical power by axial movement of the piston assembly. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A mud pulser system, comprising:
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a housing having a flow line orifice with a cross-sectional area less than a cross-sectional area of an upstream region disposed upstream of the flow line orifice and a downstream region disposed downstream of the flow line orifice; a piston assembly configured to move axially within the housing and comprising (i) a shaft having a conduit fluidly connecting the upstream region with a control chamber;
(ii) a poppet attached to the shaft, at least partially disposed in the downstream region, and defining a flow line gap between the poppet and the flow line orifice; and
(iii) a power piston separating a first piston chamber, in fluid communication with the downstream region, from a second piston chamber;a control valve configured to permit fluid communication between the second piston chamber and the control chamber in an open state and prevent fluid communication between the second piston chamber and the control chamber in a closed state; and a power generation unit comprising a magnet and a coil configured to achieve relative axial motion in response to axial motion of the piston assembly. - View Dependent Claims (16, 17, 18, 19)
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Specification