The disclosure relates to a manufactured composition, material or device comprising at least two different nonradioactive isotope atoms. Each nonradioactive isotope atom is present in an amount sufficient to increase the total amount of the nonradioactive isotope atom above the total amount found in the manufactured composition, material or device in the absence of adding the nonradioactive isotope atom to increase said total amount. The ratio(s) of the at least two nonradioactive isotopes in the manufactured composition, material or device are measurably different than the ratio(s) found in the manufactured composition, material or device in the absence of adding the nonradioactive isotope atom to increase said total amount.

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.

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.

Degradable polymer additives are provided. The degradable polymer additives include a tracer functional group that is bonded to a base polymeric component by a hydrolysable covalent bond. The base polymeric component is a polysaccharide. The tracer functional group is selected from the group comprising a halogen-containing functional group, a substituted heterocyclic aromatic group, and combination thereof. A method utilizing the degradable polymeric additives in an altered drilling fluid is provided. Such a method includes introducing the altered drilling fluid into a wellbore and recovering an associated wellbore cutting from a depleted drilling fluid.

A method of monitoring a fluid is described comprising: introducing a tracer into the fluid and analysing the fluid to determine if the tracer is present in the fluid; characterised in that the tracer comprises luminescent carbon-based nanoparticles exhibiting a peak luminescence intensity at an emission wavelength of at least 500 nm. The method is in particular a method of monitoring a parameter of a hydrocarbon well, pipeline or formation. A use of a tracer and a tracer composition comprising carbon-based nanoparticles exhibiting a peak luminescence intensity at an emission wavelength of at least 500 nm are also described.

A method of determining the suitably of corrosion inhibitors, or other additives in the presence of corrosion inhibitor, for a given fluid environment. The method including determining if there is a difference in the presence or level of micelles between a fluid sample to which corrosion inhibitor has been added either alone or to which corrosion inhibitor and at least one additional fluid additive or additives have been added. The method can be used to determine the compatibility of fluid additives.

A chemical tracer particle can include a polymer core, a tracer chemical embedded in the polymer core, and an outer layer surrounding the polymer core, the outer layer including a surfactant. A method of tracing flow of well fluid from each of multiple stages in a well can include injecting into each stage a respective one of multiple chemical tracers, each of the chemical tracers including chemical tracer particles, each of the chemical tracer particles including a polymer core, a tracer chemical embedded in the polymer core, and an outer layer surrounding the polymer core, the outer layer including a surfactant, and producing the chemical tracers from the stages. A method of producing a chemical tracer particle can include generating a polymer core having a tracer chemical embedded therein, and surrounding the polymer core with an outer layer including a surfactant.

A method for detection of an adulterated diesel fuel in a sample is disclosed. The method includes contacting a sample with a molecular probe, the molecular probe having a photoluminescence which is environmentally sensitive; collecting the photoluminescence from the molecular probe; and determining whether the photoluminescence is indicative of adulterated diesel fuel. A test strip for the detection of adulterated diesel fuel in a sample is disclosed, comprising a molecular probe embedded in a substrate and/or immobilized to the substrate, the molecular probe having a photoluminescence which is environmentally sensitive to adulterated diesel fuel. The method and test strips are designed to be robust, portable, and within the capabilities of untrained personnel.

A system for tracking fuel in a fuel distribution network is provided. The system includes a plurality of tracking devices disposed at a plurality of fuel transport locations including a supplier fuel storage location, a mobile fuel storage location, a stationary fuel storage location and a vehicle fuel location, wherein each tracking device is configured to read in real time the digital tag by receiving a radiation emission spectrum associated with the fuel identification information as the fuel is transported through the plurality of fuel transfer locations. The digital tag includes information about the fuel.