A wellbore tool string includes a combination of acoustic inspection tool(s) and electro-mechanical inspection tool(s). The tool string is configured to combine acoustic with electro-mechanic wellbore inspection to circumvent limitations that both technologies may be subject to in wellbore environments. Anomalous data from one or more acoustic tools can be correlated with data acquired by an electro-mechanical tool incorporated into the same tool string to determine wellbore conditions that may have adversely affected the operation of the acoustic tool(s).

A downhole tool for analyzing reservoir fluids includes a mechanism for extracting a fluid sample (e.g., single phase liquid sample) from a wellbore, a sample depressurization module to liberate the gas phase from the extracted fluid sample, and a gas sensor utilized to detect one or more components of the gas phase. In certain embodiments, the downhole tool may be a formation testing tool, and the depressurization module may be a bubble point measurement module.

A system for locating water floods, in some embodiments, comprises: multiple non-reference electrodes with insulative pads for coupling to a borehole casing; a reference electrode with an insulative pad for coupling to the borehole casing; and multiple transducers coupled to the reference and non-reference electrodes, each of said electrodes coupled to one or more of the multiple transducers, wherein each transducer coupled to a non-reference electrode determines a differential non-reference potential between that non-reference electrode and the reference electrode, and wherein a transducer that couples to the borehole casing determines an absolute reference potential between the borehole casing and the reference electrode; wherein the differential non-reference potentials are mathematically combined with the absolute reference potential to produce absolute non-reference potentials; wherein scaling weights are applied to said absolute non-reference potentials to produce scaled absolute potentials that are used to determine a water flood location.

A method of determining a condition within a wellbore. The method comprises introducing a tubular member in a wellbore extending through a subterranean formation, the tubular member comprising a downhole article including a deformable material disposed around a surface of the tubular member, electrically conductive elements dispersed within the deformable material. The method includes measuring at least one electrical property of the deformable material. At least one of water ingress into the wellbore or an amount of expansion of the deformable material is determined based on the at least one measured electrical property. Related downhole systems and other related methods are also disclosed.

Methods, systems, devices, and products for estimating a parameter of interest of a downhole fluid in a borehole intersecting an earth formation. Apparatus include evanescent wave measurement instruments, which may include a substrate configured for contact with a downhole fluid such that at least a portion of the substrate is immersed in the downhole fluid; a waveguide formed in an interior of the substrate and having a configuration geometrically configured to generate an interaction between the downhole fluid and an evanescent wave arising from electromagnetic energy propagating in a segment of the waveguide; and a detector configured to generate measurement information indicative of the downhole fluid in response to electromagnetic signals received from the waveguide responsive to the interaction. The interaction may result in absorption of at least a portion of the electromagnetic energy propagating in the waveguide. The waveguide may be written in the substrate using laser pulses.

Methods, systems, and devices for characterizing an anomalous fluid body in an earth formation using measurements in a borehole intersecting the formation. Methods include galvanically exciting a transient electric field in the earth formation which interacts with an anomalous fluid body in the earth formation remote from the borehole; galvanically receiving a corresponding transient electromagnetic (TEM) signal; and using at least one processor to estimate a value of a parameter of the anomalous fluid body using the corresponding transient signal.

Apparatus and methods for acquiring strain profiles of an optical conductor of a wireline cable in a wellbore, either while the cable is lowered and/or at intervals during the lowering when the cable is briefly stationary. Changes in the acquired strain profiles are utilized to infer or otherwise determine changes in the disposition of the cable.

An apparatus and method provides for nondestructive inspection of a generally tubular target structure (such as a wellbore casing) by rolling contact engagement of one or more rolling probe devices with the target structure. Each rolling probe device carries electromagnetic (EM) measurement instrumentation to capture measurement data during rolling contact engagement with the casing. Each rolling probe device may comprise an instrumentation carrier (e.g., a roller or a wheel) having an endless tread surface to engage the target structure, with the EM measurement instrumentation extending along the endless tread surface and being located at or adjacent an exterior of the instrumentation carrier. A plurality of such rolling instrumentation carriers can be mounted at azimuthally spaced positions on a tool body configured for axial movement along a wellbore.

A method and system are geosteering in coiled tubing directional drilling. In an exemplary method, a response from a gas sensor disposed on a bottom hole assembly is measured and a gas parameter from the response is determined. A trend in the gas parameter is determined. Adjustments to geosteering vectors for the bottom hole assembly are determined based, at least in part, on the gas parameter, the trend, or both.

A flow assembly is deployed downhole in a casing for a cementing operation. The flow assembly has a spool with an optical cable. As cement is pumped downhole and through the flow assembly, a dart attached to the optical cable on the spool is dragged with the flow of cement. Cement flow is stopped based on signals along the optical cable that the dart is at a desired location downhole.