A system and method for magnetic survey uses an autonomous vehicle configured to traverse over the area in a grid pattern with a magnetometer coupled to the autonomous vehicle and configured to obtain magnetic measurements at a controlled rate, the magnetometer obtaining a uniform sampling of the magnetic measurements in each grid of the grid pattern; and a processor configured to obtain the magnetic survey based on the magnetic measurements.

A system and method for magnetic survey uses an autonomous vehicle configured to traverse over the area in a grid pattern with a magnetometer coupled to the autonomous vehicle and configured to obtain magnetic measurements at a controlled rate, the magnetometer obtaining a uniform sampling of the magnetic measurements in each grid of the grid pattern; and a processor configured to obtain the magnetic survey based on the magnetic measurements.

A method for geological formation analysis may include collecting time-lapsed well-based measurement data from a first borehole in a geological formation over a measurement time period, and collecting time-lapsed electromagnetic (EM) cross-well measurement data via a plurality of spaced-apart second boreholes in the geological formation over the measurement time period. The method may further include determining simulated changes to a hydrocarbon resource in the geological formation over the measurement time period based upon a geological model using a processor, and using the processor to determine if the simulated changes are within an error threshold of the time-lapsed well-based measurement data and the time-lapsed cross-well EM measurement data. If the simulated changes are not within the error threshold, then the geological model may be updated.

An apparatus for monitoring rod rotation in a rod lift system. The apparatus comprises one or more sensors that reside on the rod string of the rod lift system. The sensor is configured via a processor to generate a signal indicative of radial position of the sensor relative to an external frame of reference. The signal may be sent to a wireless I/O module, with the signals being indicative of at least partial rotation or, alternatively, a lack of rotation, of the rod-string. The processor is configured to generate an alarm if an absence of rod rotation is detected while the rod lift system is running and transmit this signal to the nearby wireless I/O module. A method for monitoring a reciprocating rod lift system is also provided.

An apparatus for monitoring rod rotation in a rod lift system. The apparatus comprises one or more sensors that reside on the rod string of the rod lift system. The sensor is configured via a processor to generate a signal indicative of radial position of the sensor relative to an external frame of reference. The signal may be sent to a wireless I/O module, with the signals being indicative of at least partial rotation or, alternatively, a lack of rotation, of the rod-string. The processor is configured to generate an alarm if an absence of rod rotation is detected while the rod lift system is running and transmit this signal to the nearby wireless I/O module. A method for monitoring a reciprocating rod lift system is also provided.

A system, method, and magnetic field sensor. The magnetic field sensor includes a strain gauge. The magnetic field sensor further includes one or more magnetostrictive layers disposed upon the strain gauge. The magnetostrictive layers are configured to cause a displacement of the strain gauge in response to sensing a magnetic field. The magnetic field sensor further includes logic connected to the strain gauge configured to determine a parameter of the magnetic field in response to sensing the magnetic field.

A system, method, and magnetic field sensor. The magnetic field sensor includes a strain gauge. The magnetic field sensor further includes one or more magnetostrictive layers disposed upon the strain gauge. The magnetostrictive layers are configured to cause a displacement of the strain gauge in response to sensing a magnetic field. The magnetic field sensor further includes logic connected to the strain gauge configured to determine a parameter of the magnetic field in response to sensing the magnetic field.

Techniques are disclosed for generating a time series representation of passive electromagnetic (EM) fields via towed streamer measurements without dependence on water-bottom measurement equipment. Such techniques may include storing records of respective time series measurements of passive EM fields measured by individual receivers as the individual receivers pass over a first measurement point, where the respective time series measurements correspond to respective measurement intervals, and where the respective time series measurements are synchronized with respect to a reference clock. The records of the respective time series measurements may be combined to generate a time series representation of passive EM fields observed at the first measurement point over a combination of the respective measurement intervals. The time series representation of passive EM fields observed at the first measurement point may, in turn, be used to identify one or more characteristics of subsurface structure.

Techniques are disclosed for generating a time series representation of passive electromagnetic (EM) fields via towed streamer measurements without dependence on water-bottom measurement equipment. Such techniques may include storing records of respective time series measurements of passive EM fields measured by individual receivers as the individual receivers pass over a first measurement point, where the respective time series measurements correspond to respective measurement intervals, and where the respective time series measurements are synchronized with respect to a reference clock. The records of the respective time series measurements may be combined to generate a time series representation of passive EM fields observed at the first measurement point over a combination of the respective measurement intervals. The time series representation of passive EM fields observed at the first measurement point may, in turn, be used to identify one or more characteristics of subsurface structure.

A system includes at least one sensing unit, the sensing unit including a sensing element. The system includes at least one spatial Lorentz filter coupled to the sensing element. The spatial Lorentz filter (SLF) includes an input coupled to the sensing element and an analog to digital converter (ADC) providing a filtered output signal. The sensing unit is connected to a processor configured for determining velocity or position with respect to a magnetic field and/or a geographic position by processing SLF output signals.