An electrical submersible well pump assembly has a SAW (surface acoustic wave) sensor on a motor shaft. A SAW electronic circuit mounts to the motor housing. The SAW electronic circuit has an antenna closely spaced to the SAW sensor for monitoring torque on the motor shaft. A controller at an upper end of the well supplies power to the motor. A motor gauge unit mounted to a lower end of the motor transmits signals to the controller. A signal line extends from the SAW electronic circuit to the motor gauge unit for transmitting signals from the SAW electronic circuit to the motor gauge unit, and from the motor gauge unit to the controller.

A downhole sub has a body defined by a wall extending in an axial direction from a first end to a second end. An inner surface of the wall defines a flow path through the downhole sub and an outer surface of the wall defines an outer diameter of the downhole sub. A compartment extends from the outer surface into the wall to having a depth less than a thickness of the wall. A housing may be removably fixed in the compartment. One or more mobile devices may be disposed in the housing. Each of the one or more mobile devices includes a sensor encapsulated in a protective material. A control element may block an opening of the housing, the control element is made of a dissolvable material configured to dissolve at a predetermined depth in a wellbore and release the one or more mobile devices into the wellbore.

An untethered apparatus for measuring properties along a subterranean well. According to at least one embodiment, the untethered apparatus includes a housing, and one or more sensors configured to measure data along the subterranean well. The data includes one or more physical, chemical, geological or structural properties in the subterranean well. The untethered apparatus further includes a processor configured to control the one or more sensors measuring the data and to store the measured data, and a transmitter configured to transmit the measured data to a receiver arranged external to the subterranean well. Further, the untethered apparatus includes a controller configured to control the buoyancy or the drag of the untethered apparatus to control a position of the untethered apparatus in the subterranean well. The processor includes instructions defining measurement parameters for the one or more sensors of the untethered apparatus within the subterranean well.

A method of drilling a wellbore includes drilling the wellbore through a formation by injecting drilling fluid through a drill string and rotating a drill bit. The drill string includes a shifting tool, a receiver in communication with the shifting tool, and the drill bit. The method further includes retrieving the drill string from the wellbore through a casing string until the shifting tool reaches an actuator. The casing string includes an isolation valve in an open position and the actuator. The method further includes sending a wireless instruction signal to the receiver. The shifting tool engages the actuator in response to the receiver receiving the instruction signal. The method further includes operating the actuator using the engaged shifting tool, thereby closing the isolation valve and isolating the formation from an upper portion of the wellbore.

A method includes determining where to place one or more devices at a site. Each device includes a first sensor configured to measure a concentration of a greenhouse gas (GHG). The method also includes measuring the concentration of the GHG with the first sensors. The method also includes quantifying a rate that the GHG is emitted based at least partially upon the measured concentration of the GHG. The method also includes determining a location of a GHG-emitting source at the site that is emitting the GHG that is measured by the first sensors. The location is determined based at least partially upon the measured concentration, the quantified rate, or both. The method also includes identifying the GHG-emitting source at the determined location by comparing the determined location with a list of a plurality of GHG-emitting sources at the site and locations thereof.

Systems and methods for mitigating flow variability and slugging in pipelines (e.g., trunk-lines leading to gas-oil separation plants (GOSP)) use supervised machine learning algorithms to develop operational strategies for controlling inflows to facilities such as GOSPs.

A method for identifying structure of flow field in unconventional gas reservoir is provided. The unconventional gas reservoir comprises at least one horizontal well, for any horizontal well in the at least one horizontal well, the method comprises: during fracturing fluid flowback stage, obtaining first production data, and drawing an actual production curve diagram of the fracturing fluid flowback stage; obtaining reservoir physical parameters corresponding to different fracture network forms and second production data, and performing numerical simulations on water production rate, gas production rate and casing pressure of the fracturing fluid flowback stage, and drawing layouts of structure of flow field corresponding to different fracture network forms of the fracturing fluid flowback stage; and comparing the actual production curve diagram with the layouts of structure of flow field corresponding to different fracture network forms to identify structure of flow field of the reservoir after fracturing.

A delayed-activation sensor system includes at least one microsensor. The microsensor may include at least one sensor module for sensing a condition in an environment and a dissolvable coating encapsulating at least a portion of the at least one sensor module such that the dissolvable coating prevents the at least one sensor module from sensing the condition in the environment. The dissolvable coating may be dissolvable in a fluid in the environment such that the sensor module is activated after being located in the environment for a period of time. The microsensor may also include at least one energy harvester module to generate electrical power for the microsensor from the environment.

Provided here are methods and system to detect an untethered device in a wellhead. The untethered device includes a housing, a transducer, and one or more sensors configured to measure data along the subterranean well. The transducer emits acoustic signals that are received by microphones on the surface of the wellhead. Based on these acoustic signals, the location of the untethered device is determined and appropriate valves may be opened or closed by an operator.

Wellbore plugs that include an interrogation device, hydrocarbon wells that include the wellbore plugs, and methods of operating the hydrocarbon wells are disclosed herein. The wellbore plugs include a plug body, an interrogation device, and a sealing structure. The interrogation device is contained within the plug body and includes a sensor configured to detect at least one parameter of the hydrocarbon well. The hydrocarbon wells include a wellbore, a downhole tubular, the plug, and a communication device configured to receive communication data from the interrogation device. The methods include releasing an interrogation device from a plug, detecting at least one parameter within the hydrocarbon well with the interrogation device, transmitting communication data from the interrogation device, and receiving the communication data with a communication device.