Current supplied to electrical submersible pumps in wells is monitored, and signal processing based on wavelet analysis and phase diagram analysis is performed on the data obtained from monitoring. An incipient malfunction of the electrical submersible pump, such as one due to scale build-up in and around the pump, can be detected at an early stage.

Current supplied to electrical submersible pumps in wells is monitored, and signal processing based on wavelet analysis and phase diagram analysis is performed on the data obtained from monitoring. An incipient malfunction of the electrical submersible pump, such as one due to scale build-up in and around the pump, can be detected at an early stage.

Current supplied to electrical submersible pumps in wells is monitored, and signal processing based on wavelet analysis and phase diagram analysis is performed on the data obtained from monitoring. An incipient malfunction of the electrical submersible pump, such as one due to scale build-up in and around the pump, can be detected at an early stage.

A portable current injection test apparatus for injecting a predetermined amount of current through an electrical conductor includes an encasement which houses a first transformer having primary and secondary windings, the secondary winding coupled to a pair of output terminals, and a variable transformer having primary and secondary windings and a control switch. The variable transformer's primary winding is electrically coupled to a power source and its secondary winding is electrically coupled to the primary winding of the first transformer. The variable transformer switch manually controls power output at the secondary winding of the first transformer. First and second probes are connected to the output terminals and their distal ends are configured to inject the predetermined amount of current through the electrical conductor. A short circuit condition is defined across the secondary winding of the first transformer while the predetermined amount of current is injected through the electrical conductor.

A portable current injection test apparatus for injecting a predetermined amount of current through an electrical conductor includes an encasement which houses a first transformer having primary and secondary windings, the secondary winding coupled to a pair of output terminals, and a variable transformer having primary and secondary windings and a control switch. The variable transformer's primary winding is electrically coupled to a power source and its secondary winding is electrically coupled to the primary winding of the first transformer. The variable transformer switch manually controls power output at the secondary winding of the first transformer. First and second probes are connected to the output terminals and their distal ends are configured to inject the predetermined amount of current through the electrical conductor. A short circuit condition is defined across the secondary winding of the first transformer while the predetermined amount of current is injected through the electrical conductor.

A portable current injection test apparatus for injecting a predetermined amount of current through an electrical conductor includes an encasement which houses a first transformer having primary and secondary windings, the secondary winding coupled to a pair of output terminals, and a variable transformer having primary and secondary windings and a control switch. The variable transformer's primary winding is electrically coupled to a power source and its secondary winding is electrically coupled to the primary winding of the first transformer. The variable transformer switch manually controls power output at the secondary winding of the first transformer. First and second probes are connected to the output terminals and their distal ends are configured to inject the predetermined amount of current through the electrical conductor. A short circuit condition is defined across the secondary winding of the first transformer while the predetermined amount of current is injected through the electrical conductor.

A portable current injection test apparatus for injecting a predetermined amount of current through an electrical conductor includes an encasement which houses a first transformer having primary and secondary windings, the secondary winding coupled to a pair of output terminals, and a variable transformer having primary and secondary windings and a control switch. The variable transformer's primary winding is electrically coupled to a power source and its secondary winding is electrically coupled to the primary winding of the first transformer. The variable transformer switch manually controls power output at the secondary winding of the first transformer. First and second probes are connected to the output terminals and their distal ends are configured to inject the predetermined amount of current through the electrical conductor. A short circuit condition is defined across the secondary winding of the first transformer while the predetermined amount of current is injected through the electrical conductor.

Some examples of monitoring hydrocarbon reservoirs using induced polarization effect includes inducing polarization in a subterranean zone using an induced polarization fluid. The subterranean zone includes first formations and second formations. A quantity of hydrocarbons in the first formations is greater than quantity of hydrocarbons in the second formations. The induced polarization data is obtained from the subterranean zone. A portion of the induced polarization data from the first formations is different from a portion of the induced polarization data from the second formations. The second formations in the subterranean zone are identified based on the obtained induced polarization data.

Some examples of monitoring hydrocarbon reservoirs using induced polarization effect includes inducing polarization in a subterranean zone using an induced polarization fluid. The subterranean zone includes first formations and second formations. A quantity of hydrocarbons in the first formations is greater than quantity of hydrocarbons in the second formations. The induced polarization data is obtained from the subterranean zone. A portion of the induced polarization data from the first formations is different from a portion of the induced polarization data from the second formations. The second formations in the subterranean zone are identified based on the obtained induced polarization data.

Some embodiments of the invention relate to a mobile detection device embodied as a bucket of an earth moving machine for an evaluation of a distance value and/or proximity from the bucket to an occluded AC-current carrying structure according to the magnetic field emanated from the structures AC-current. There is at least one detection coil, comprising at least one winding of an electrically conductive material, which is connected to a first amplification stage, with an amplifier circuit embodied as a current sensing amplifier, which are both are sealed within a common enclosure that is located at the bucket. An output of the amplifier circuit is configured to be linked to an electronic signal evaluation unit for detecting the occluded structure according to an electrical signal induced in the detection coil by the magnetic field.