High temperature miniature mobile device includes a power generator including a first material of one polarity and a second material that is fixed in position and is of opposite polarity of the first material, wherein the first material is propelled towards or slid against the second material based on motion of the miniature mobile device so that the two materials have a maximized point of contact to generate maximum power, an electrode that is connected to the first material or second material, a bridge rectifier connected to the electrode to transform the power generated into direct current from alternating current, a storage unit for storing the power generated by the power generator, a sensor that gathers information concerning a downhole environment, and a microcontroller and transceiver unit to manage the power generated by the power generator and transmit information gathered by the sensor.

A frac plug includes a body having an outer surface, a first pocket in the outer surface, and a second pocket in the outer surface. In addition, the frac plug includes a first sensor removably disposed in the first pocket. The first sensor is configured to measure and record a plurality of pressures. The frac plug also includes a second sensor removably disposed in the second pocket. The second sensor is configured to measure and record a plurality of pressures. Further, the frac plug includes a first cap releasably coupled to the body and closing the first pocket. Moreover, the frac plug includes a second cap releasably coupled to the body and closing the second pocket. The first cap includes a port and the second cap includes a port.

The disclosed embodiments include a wellbore isolation device, a method to form the wellbore isolation device, and a downhole, device-tracking system. In one embodiment, the system includes a wellbore isolation device having a first identification tag and a dissolvable component. The first identification tag is operable to travel along a fluid flow path toward the surface of a well upon dissolution of the dissolvable component. The system also includes a detector disposed along the fluid flow path, where the detector is operable to detect the first identification tag when the first identification tag is proximate to the detector.

The disclosed embodiments include methods to obtain measurements of a wellbore and data logging devices. In one embodiment, the method includes measuring, by a sensor of a wellbore isolation device, at least one condition of the wellbore proximate to the sensor. The wellbore isolation device has a dissolvable portion, and the sensor is releasable from the wellbore isolation device upon dissolution of the dissolvable portion. The method also includes storing measurements of the at least one condition of the wellbore in a machine-readable medium. The method further includes providing the stored measurements of the sensor to a controller following dissolution of the dissolvable portion.

Systems and methods for detecting or monitoring treatment fluids in subterranean formations are provided. In certain embodiments, the methods comprise: providing an enhanced treatment fluid that comprises at least a base fluid and one or more contrast enhancement agents, which may include dielectric materials, magnetic materials, dispersive materials, and/or any combination thereof; and introducing the enhanced treatment fluid into at least a portion of a well bore penetrating a portion of a subterranean formation in the course of certain operations in the well bore.

A downhole wireless actuation based pipe lifting system with wireless communications and data acquisition capabilities for lifting casing from a well formation. The system may be deployed along a casing string with centralizers in the closed position to prevent any resistance that would be created by the centralizers. Upon reaching the proper location in the well, one or more pipe lifting systems may be actuated to lift the pipe from the well formation thereby providing a path for cement to flow around the casing. The system may collect, and store data before, during, and after the cementing process is performed, and may transmit the data wirelessly or by cable.

Methods and systems are presented in this disclosure for performing multi-frequency communications during wellbore operations. Communication of data related to a state of a wellbore (e.g., characteristics and/or locations of one or more fluids flowing along a casing in the wellbore during a cementing operation) can be performed simultaneously or sequentially involving a plurality of nodes located along the casing in the wellbore, wherein each of the nodes is configured to use a different frequency for communication. In this way, a higher information throughput and more reliable communication can be achieved during wellbore operations.

Methods and systems are presented in this disclosure for determining information (e.g., visual information) about locations of different fluids flowing along a casing in a wellbore. A plurality of radio frequency (RF) micro-electro-mechanical system (MEMS) tags is placed in a plurality of fluids flowing through an annulus region between a casing string in the wellbore and a reservoir formation. At a plurality of sensing nodes located along the casing string, information about the fluids is gathered by communicating with the RF MEMS tags placed in the fluids. The information about fluid locations along the casing gathered by the sensing nodes is communicated to a receiving device, and appropriate operation in relation to the wellbore is performed based on the communicated information.

An electrically passive device and method for in-situ acoustic emission, and/or releasing, sampling and/or measuring of a fluid or various material(s) is provided. The device may provide a robust timing mechanism to release, sample and/or perform measurements on a predefined schedule, and, in various embodiments, emits an acoustic signal sequence(s) that may be used for triangulation of the device position within, for example, a hydrocarbon reservoir or a living body.

A flow control method and assembly for an oil or gas well comprises generating a pressure signature in the fluid in a bore of the well comprising a minimum rate of change of pressure, and transmitting the pressure signature to a control mechanism to trigger a change in the configuration of a flow control device in the bore in response to the detection of the pressure signature in the fluid. The flow control device can comprise a barrier, such as a flapper, sleeve, valve or similar. The pressure signature is transmitted via fluid flowing in the bore, typically being injected into the well, optionally during or before frac operations, via fluid being used for the frac operations. The control mechanism typically includes an RFID reader to receive RF signals from tags deployed in the fluid flowing in the bore.