A fluorescent solution is disclosed for use in a hydraulic or diesel fluid to facilitate detection of injection of the hydraulic of diesel fluid into a human. The fluorescent solution includes a fluorescent dye and a stabilizing agent. The stabilizing agent may be a surfactant. A hydraulic fluid mixture is also disclosed which includes a fluorescent solution and a hydraulic fluid.

Systems and methods of surface logging a well using a plurality of polymeric taggants distinguishable from each other include adding each of the plurality of polymeric taggants to a circulating drilling fluid while drilling the well in a repeating sequence and taking a sample drill cuttings carried by the circulating drilling fluid.

A sensing system for sensing degradation of a machine fluid is disclosed. The sensing system may comprise a capsule including a dissolvable element. The dissolvable element may be configured to at least partially dissolve when placed in contact with the machine fluid having an acid content indicative of degradation of the machine fluid. The sensing system may further comprise a tracer encapsulated by the capsule. The tracer may be at least partially released from the capsule when the dissolvable element at least partially dissolves.

An oil filter may include a housing. The housing may include an inlet, an outlet, and a filter element. The filter element may be located downstream of the inlet and upstream of the outlet. Additionally, the filter element may include a filtering material and a tracer material.

The present disclosure provides compositions, methods, and systems for identifying marked hydrocarbon fluids. These compositions, methods, and systems utilize a gas chromatography marker including a pyrrolidinone. The methods and systems can identify the presence or absence of the gas chromatography marker and/or the pyrrolidinone. The compositions, methods, and systems can optionally utilize a spectroscopic marker.

The present disclosure provides compositions, methods, and systems for identifying marked hydrocarbon fluids. These compositions, methods, and systems utilize a gas chromatography marker including a pyrrolidinone. The methods and systems can identify the presence or absence of the gas chromatography marker and/or the pyrrolidinone. The compositions, methods, and systems can optionally utilize a spectroscopic marker.

A method of monitoring renewable carbon in fuel streams in a refinery or blend facility while co-processing a bio-feedstock with a fossil feedstock or blending a renewable product with a fossil product wherein the method provides for quantification of renewable C14 carbon content to adjust the total renewable content to a targeted renewable content in situ while lowering the limit of detection.

Disclosed is a method of monitoring and optimizing the concentration of an additive composition in a fuel ethanol. The method includes adding a known amount of the additive composition to the fuel ethanol to create a treated fuel ethanol. A measured fluorescent signal provides information for determining the concentration of the additive composition in the fuel ethanol. A component in the additive composition is capable of providing the fluorescent signal or capable of being chemically derivatized to provide a fluorescent signal or a colorimetric signal. Based upon the measured fluorescent signal or colorimetric signal, the concentration of the additive composition in the fuel ethanol may be adjusted.

Techniques for correlating a depth of drill bit cuttings include circulating a drilling fluid into a wellbore during a drilling process to form the wellbore in a subterranean formation; circulating a portion of uniquely identifiable particles from a container into the drilling fluid during the drilling process; circulating a return drilling fluid that includes the drilling fluid, cuttings from the subterranean formation, and the uniquely identifiable particles; separating the drilling fluid from the cuttings from the subterranean formation and the uniquely identifiable particles; capturing at least one image of the separated cuttings and the uniquely identifiable particles; and determining, based on the image, a depth of the subterranean formation.

The present invention relates to novel compounds of polyfunctionalized polyethylene and polypropylene glycols, their synthesis and their use, in particular as tracers in applications related to oil and gas production, and especially as specific markers of various target fluids.