The objective of this study was to describe an analytical validation a simple, rapid, sensitive, and selective liquid chromatography (LC)-tandem mass spectrometry (MS-MS) method for quantification metronidazole in human plasma samples from bioavailability studies. were pre-treated by liquid.liquid extraction (LLE) with ethyl acetate. Metronidazole the internal standard (IS) zidovudine analyzed combined reversedphase LC-MS-MS positive ion electrospray ionization. Multiple reactions monitoring...

Abstract This paper presents the results from stability experiments carried out on a selected set of chemical compounds. These represent one steps for their qualification as oil/water partitioning tracers measurement residual oil saturation in inter-well region. Single-well tracer tests (SWCTT) are proven tool, frequent industry, to measure (SO) near well SWCTT "push-and-pull" where an ester will partially hydrolyze, generating passive water tracer, often alcohol. Oil is then determined lag...

In the present document, we report development of an analytical method consisting a sequential direct-immersion/headspace solid-phase microextraction (DI-HS-SPME) followed by gas-phase chromatography and tandem mass spectrometry (GC-MS/MS) for simultaneous analysis 4-chlorobenzyl alcohol, 2,6-dichlorobenzyl 4-methoxybenzyl 3,4-dimethoxybenzyl pyridine, 2,3-dimethylpyrazine in oilfield production waters. These compounds are under evaluation use as phase-partitioning tracers oil reservoirs. To...

Many non-ionic chemical compounds will form real solutions in equilibrium between two immiscible phases contact. The partition coefficient (K) is defined as the quotient concentration of substance hydrocarbon and aqueous phase. reversible a compound basis partitioning inter-well tracer test (PITT). PITTs are high interest for characterization oil reservoirs, hydrogeology assessment contamination soils by non-aqueous phase liquids (NAPLs), process technology. K value influenced actual...

Abstract Controlled release of aromatic mixtures to the atmosphere is a requirement for scented systems indoor applications. The product must smell nice, but also be able last, slowly releasing perfume over time. Several adsorption materials have been used, this purpose. In study, cork was investigated as potential adsorbent application in drawer sachets and equivalent products. Cork selected due its properties because it natural, renewable, sustainable material. Granulated significant...

Pyridine, 2-hydroxy-6-methylpyridine, 3-hydroxypyridine, and 4-methoxypyridine are evaluated as potential phase-partitioning oil field tracers. Their stability is tested in a brine for 12 weeks at temperatures between 25 °C–150 °C, initial pH values of 5,5; 7,1; 8,0. Interactions with kaolinite clay, Berea sandstone limestone also evaluated. The main results follows: pyridine stable up to 150 not influenced by the rock substrates or pH. 2-hydroxy-6-methylpyridine becomes unstable T ≥ 50...

Summary The number of mature oil fields increases worldwide with recovery factors 20% – 40%. Further exploration the known resources requires thorough understanding reservoir. Partitioning inter-well tracer test (PITT) is a promising method to determine residual saturation in reservoir’s swept volumes, thus contributing for its understanding. PITTs identify EOR targets, evaluate operations and efficiency volumetric sweep between wells. are rare industry, partly due scarce compounds qualified...

Abstract Thousands of offshore wells are planned to be permanently plugged and abandoned worldwide up 2050. Fractures known occur develop in the materials used as seals/plugs, creating channels that compromise P&A integrity. This risk is increased by foreseeable use oil gas assets CCS hydrogen storage projects. Existing monitoring methods may fail provide early warning issues with plug There presently no regulation place on Norwegian Continental Shelf about long-term wells, however, this...

Summary Tracer technology for well experiments is one of very few applicable technologies collection unique dynamic data reservoir flows. Two main tracer tests are commonly used characterization: (i) the Single-Well Chemical Test (SWCTT) and (ii) Inter-Well (IWTT) which includes Partioning Tests (PITT). SWCTT PITT give access to residual oil saturation (SOR) respectively in near-well interwell regions. Non-partitioning IWTT allows assessing qualitatively quantitatively flow connections,...

Summary A partitioning inter-well tracer test (PITT) is a dynamic tool to measure the residual oil saturation (SOR) in swept volumes of oilfields. Knowledge about SOR an important parameter design many IOR projects. Such projects are increasingly satisfy global demand for hydrocarbons, as worldwide number mature oilfields steadily grows and very few large hydrocarbon rich basins left unexplored. By performing PITT before after project implemented, performance such can also be evaluated....

Abstract The single-well chemical tracer test (SWCTT) is widely used in the determination of residual oil saturation (SOR) near-well region. SWCTTs typically require large amounts chemicals and some days well shut-down. In present paper, we propose using thermo-sensitive nanogel carriers for targeted release tracers SWCTTs. This approach has potential to significantly reduce time amount required by a SWCTT. method was inspired previously developed drug delivery applications stimuli-sensitive...