Abstract: A method and system for nuclear magnetic resonance (NMR) sequence for partially polarized echo trains is provided. An NMR pulse sequence is applied into a wellbore penetrating a subterranean formation using a NMR tool. The NMR pulse sequence includes a first cycle and a second cycle. The first cycle includes a first sequence of radio frequency (RF) pulses of a first duration and a first trainlet sequence of a second duration different from the first duration. The second cycle includes a second sequence of RF pulses of the first duration and a second trainlet sequence of the second duration. The second sequence of RF pulses forms a phase alternated pair with the first sequence of RF pulses. Echo signals corresponding to a substance in the subterranean formation are measured based on the NMR pulse sequence. A distribution of a characteristic of the substance is determined based on the echo signals.

Abstract: Aspects of the present disclosure relate to a downhole device including an actuator which has a primary purpose to operate the device while also having a secondary purpose to induce controlled pulses into a downhole environment at a first location for detection at a second location. A control package can be connected to the actuator. The control package is operable to detect a trigger event and control the actuator to cause the controlled pulses in the downhole environment in response. In some aspects, the trigger event is the reception of a command sent to the downhole device from the surface and the controlled pulses serve to provide a feedback signal receivable at the surface.

Abstract: The present disclosure relates to a method of cementing comprising: providing a cement composition comprising: water, a cement, and a non-aqueous liquid anti-shrinkage cement additive comprising calcined magnesium oxide and a non-aqueous liquid; introducing the cement composition into a subterranean formation; and allowing the cement composition to set in the subterranean formation. Non-aqueous liquid anti-shrinkage cement additives, cement compositions, and systems are also provided.

Abstract: A downhole tool comprising a cylindrical housing, a sleeve disposed in the cylindrical housing, forming an annular space between the sleeve and the cylindrical housing, and a tool cement composition disposed in the annular space, wherein prior to setting the tool cement composition comprises a cement, sand, a silicon-containing material, a dispersant, and water, and wherein upon setting the tool cement composition provides an annular seal having a fluid leakage of less than 750 ml over 15 minutes at a pressure of 7500 psi and a temperature of 400° F.

Abstract: The present disclosure generally relates to a system and methods for stimulation with particle-stabilized emulsion treatment fluids during hydraulic fracturing operations. A treatment fluid is disclosed, the treatment fluid including a continuous fluid phase, a dispersed fluid phase dispersed throughout the continuous fluid phase, a surfactant, and a plurality of solid particles adsorbed to an interface between the continuous and dispersed fluid phases thereby stabilizing the dispersed fluid phase in the continuous fluid phase. A method for treating a subterranean formation is disclosed, the method including providing a treating fluid comprising a plurality of solid particles adsorbed to an interface between a continuous fluid phase and a dispersed fluid phase, thereby stabilizing the continuous and dispersed fluid phases, and pumping the treating fluid under pressure via a pump to invert the emulsion so that at least a portion of the solid particles are deposited in the subterranean formation.

Abstract: A method of fracturing a subterranean formation may comprise: pumping a fracturing fluid into the subterranean formation, through a wellbore, at or above a fracture gradient of the subterranean formation, wherein the fracturing fluid comprises halloysite nanotubes.

Abstract: A method for using flow rate signals for wireless downhole communication comprises generating a first flow rate signal within a wellbore by altering the flow rate of a first fluid in the well bore, wherein the first flow rate signal comprises at least two detectable characteristics; detecting the first flow rate signal at a first downhole tool disposed within the wellbore; and actuating the first downhole tool in response to detecting the first flow rate signal.

Abstract: This disclosure may generally relate to subterranean operations and, more particularly, to systems and methods for setting a packer. Specifically, embodiments of the present disclosure may provide real-time verification of setting a packer in order to form a seal within a wellbore. A system for packer setting may comprise a packer, a telemetry module operable to wirelessly receive one or more control signals from a surface location, and a control module coupled to the telemetry module and the packer, wherein the control module is operable to actuate the packer in response to the one or more control signals from the surface location.

Abstract: An apparatus comprises a first cluster of perforator guns positioned circumferentially around a central longitudinal axis at a first axial position, wherein the first cluster is configured in a closed position while the apparatus is being lowered to a perforator position in a wellbore. After the apparatus is lowered to the perforator position, the first cluster is to move to an expanded position such that the perforator guns are moved closer to a target that is to be perforated.

Abstract: An apparatus, method, and system for determining body wave slowness from guided borehole waves. The method includes selecting a target axial resolution based on the size of a receiver array, obtaining a plurality of waveform data sets corresponding to a target formation zone and each acquired at a different shot position, computing a slowness-frequency 2D dispersion semblance map for each waveform data set, stacking the slowness-frequency 2D dispersion semblance maps to generate a stacked 2D semblance map, and determining a body wave slowness from the extracted dispersion curve. The method may also include generating a self-adaptive weighting function based on a dispersion model and the extracted dispersion curve, fitting the weighted dispersion curve and the dispersion model to determine a body wave slowness that minimizes the misfit between the weighted dispersion curve and the dispersion model. The method can be applied to both frequency-domain and time-domain processing.

Abstract: Disclosed are NMR logging methods and antenna arrangements for fast moving NMR logging tools. The NMR logging tool includes a permanent magnet for inducing a static magnetic field in a formation within a borehole and a transmitter antenna for transmitting a RF pulse sequence into the formation. Two receiver antennae are configured to receive NMR response signals from the formation, the two receiver antennae including a first receiver antenna arranged axially below a second receiver antenna. The first receiver antenna and the second receiver antenna are disposed within a surface area of the transmitter antenna, and the transmitter axial length is substantially the same as an axial length of the two receiver antennae.

Abstract: Various embodiments disclosed relate to demulsifier compositions for treatment of subterranean formations or produced petroleum comprising an emulsion. In various embodiments, the present invention provides a method of treating a subterranean formation. The method includes placing in the subterranean formation a demulsifier composition. The demulsifier composition includes an alkanolamide surfactant that is a (C1-C50)hydrocarbyl amide having groups R1 and R2 substituted on the amide nitrogen, wherein R1 and R2 are each independently selected from the group consisting of —H, —(C1-C50)hydrocarbyl, and —(C1-C50)hydrocarbylene-OH, wherein at least one of R1 and R2 is —(C1-C50)hydrocarbylene-OH. The demulsifier composition includes an alkoxylated alcohol surfactant that is a (C1-C50)hydrocarbyl-OH having a —((C2-C3)alkylene-O)n—H group on the —OH group, wherein n is about 1 to about 100. The demulsifier composition also includes an amine-oxide surfactant.

Abstract: A solid-state hydrophone may include a piezoelectric rod positioned between at least two electrodes. The piezoelectric rod may be disposed within a metallic housing to shield the piezoelectric rod and its connections from acoustic and electromagnetic waves. The piezoelectric rod and the electrodes may be potted in the mechanical housing using a potting material that may be positioned adjacent to the piezoelectric rod. At least a layer of the potting material may be positioned between the piezoelectric rod and the metallic housing to physically separate the piezoelectric rod from the metallic housing.

Abstract: Disclosed embodiments include a flow straightening device. The flow straightening device includes a blank end. The blank end designed to reside within a portion of piping to contain fluid flow within the piping. The flow straightening device also includes a straightening vane extending perpendicularly from the blank end along a longitudinal axis of the blank end. The straightening vane is designed to straighten the fluid flow as the fluid flow traverses a turn within the piping.

Abstract: Compliant wellbores screens may be arranged to radially expand in a wellbore. The screens include an outer shroud layer including a perforation pattern thereon arranged for limiting the degree to which the screens are expand. The perforation patterns may permit the screens to be expanded to a predetermined limit by imparting a stable or relatively low expansion force. Once the predetermined limit is reached, the outer shrouds may require a sharp increase in the expansion force for further expansion. The sharp increase will prevent over-expansion of the screens, particularly where precise control over an expansion force imparted to expand the screens proves difficult. The perforation pattern may include arc-shaped perforations formed in sheet metal, spaces between braided metal strands, or many other arrangements.

Abstract: Provided herein are embodiments of a method and apparatus for measuring permeability of a rock core sample in the direction of pressure gradient. In one embodiment, a method includes providing a rock core sample having an inlet primary face, an outlet primary face and one or more sidewalls having a thickness (T) adjoining the inlet and outlet primary face, wherein the inlet primary face has a surface area (SAIF) and the one or more sidewalls have a surface area (SASW), and further wherein a ratio of the inlet primary face surface area (SAIF) to sidewall surface area (SASW) is at least 0.4; placing the rock core sample, unbounded, between an inlet flow plate and an outlet flow plate; directing a fluid through from the inlet flow plate into the rock core sample; and measuring a flow rate of the fluid exiting the outlet flow plate.

Abstract: A downhole indicating device includes a collet body and a slidable collet comprising a protrusion and surrounding and slidable along a length of the collet body between a low snap position and a high snap position. In the low snap position, the protrusion is depressible under a low snap force, and in the high snap position, the protrusion is depressible under a high snap force with the low snap force being less than the high snap force.

Abstract: A system for improving communication between surface and downhole equipment, in some embodiments, comprises: a first transceiver in a formation; a second transceiver in the formation; and a third transceiver in the formation, the second transceiver positioned between the first and third transceivers, wherein, upon determining that a communication quality metric pertaining to wireless communication in the formation fails to meet a criterion, the first transceiver transmits data to the second transceiver, wherein, upon determining that said communication quality metric meets the criterion, the first transceiver transmits said data to the third transceiver in lieu of transmitting said data to the second transceiver.

Abstract: Methods for breaking polymer-containing treatment fluids for use in subterranean formations are provided. In one or more embodiments, the methods comprise providing a treatment fluid comprising a base fluid and a polymer, wherein the treatment fluid was used to treat at least a portion of a subterranean formation; and sonicating at least a portion of the treatment fluid to at least partially reduce the viscosity of the treatment fluid.

Abstract: Included are methods and systems for controlling the rheology of a treatment fluid. An example method comprises selecting a cellulose feedstock source to provide a cellulose capable of being processed into a nanocellulose having an average desired aspect ratio, and processing the cellulose with a cellulose processing technique to provide the nanocellulose with the average desired aspect ratio. The method further comprises adding the nanocellulose to the treatment fluid; wherein the nanocellulose alters a rheological property of the treatment fluid to provide an altered treatment fluid, and introducing the altered treatment fluid into a wellbore.