Downhole deposition monitoring system
First Claim
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1. A deposit monitoring apparatus located in a hydrocarbon wellbore comprising:
- an acoustic device for operating in a resonance mode which is longitudinal including a monitoring surface directly exposed to fluids in a hydrocarbon wellbore, wherein the deposition of material on the monitoring surface is monitored by measuring a change in resonance frequency of the acoustic device; and
a power supply for supplying said acoustic device with electrical energy.
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Abstract
Described is a downhole apparatus for detecting and removing deposits from a surface exposed to wellbore fluids. The apparatus can monitor the rate of deposition and subsequently remove the deposited material. The combination of detection apparatus and removal apparatus provides a downhole instrument with self-cleaning operation mode.
83 Citations
29 Claims
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1. A deposit monitoring apparatus located in a hydrocarbon wellbore comprising:
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an acoustic device for operating in a resonance mode which is longitudinal including a monitoring surface directly exposed to fluids in a hydrocarbon wellbore, wherein the deposition of material on the monitoring surface is monitored by measuring a change in resonance frequency of the acoustic device; and
a power supply for supplying said acoustic device with electrical energy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A monitoring apparatus located in a hydrocarbon wellbore comprising:
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a monitor for measuring characteristics of fluids in the hydrocarbon wellbore, the monitor having a monitoring surface that is directly exposed to fluids in the hydrocarbon wellbore;
a deposit removal system including an acoustic device for exerting a physical force on the monitoring surface to at least partially remove a deposition of material from the monitoring surface; and
a power supply for supplying said acoustic device with electrical energy, wherein the monitor further uses the acoustic device, said acoustic device to be operated in a resonance mode, wherein the monitor measures deposition of the material on the monitoring surface by measuring a change in resonance frequency of the acoustic device and wherein the acoustic device operates in a longitudinal mode. - View Dependent Claims (16, 17, 18)
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19. A monitoring apparatus located in a hydrocarbon wellbore comprising:
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a monitor for measuring characteristics of fluids in the hydrocarbon wellbore, the monitor having a monitoring surface that is directly exposed to fluids in the hydrocarbon wellbore;
a deposit removal system including an acoustic device for exerting a physical force on the monitoring surface to at least partially remove a deposition of material from the monitoring surface; and
a power supply for supplying said acoustic device with electrical energy, wherein the monitor is selected from a group comprising optical sensors, electro-chemical sensors, nuclear sensors, separation membranes, or acoustic sensors separate from the force exerting acoustic device. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A deposit monitoring apparatus located in a hydrocarbon wellbore comprising:
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an acoustic device for operating in a resonance mode including a monitoring surface directly exposed to fluids in a hydrocarbon wellbore, wherein the deposition of material on the monitoring surface is monitored by measuring a change in resonance frequency of the acoustic device, and wherein by measuring said change in resonance frequency of the acoustic device a thickness of deposited material of 600 microns can be distinguished from a thickness of deposited material of 1050 microns; and
a power supply for supplying said acoustic device with electrical energy, wherein the acoustic device operates in a longitudinal mode. - View Dependent Claims (28, 29)
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Specification