System and method for fluid processing with variable delivery for downhole fluid analysis

摘要

Described herein are variable-volume reservoir (e.g., syringe pump) based processes and systems usable to characterize samples of reservoir fluids, without having to first transport the fluids to the surface. Variable-volume reservoirs are used, for example, for one or more of storing reactants, controlling mixing ratios and storing used chemicals. The processes and systems can be used in various modes, such as continuous mixing mode, flow injection analysis, and titrations. A fluid interrogator, such as a spectrometer, can be used to detect a change in a physical property of the mixture, which is indicative of an analyte within the mixture. In at least some embodiments, a concentration of the analyte solution can be determined from the detected physical property.

主权项

1. A downhole fluid processing apparatus, comprising:
a first variable-volume reservoir pre-loaded with a reactant and having an open end in fluid communication with a fluid conduit; a second variable-volume reservoir having an open end in fluid communication with the fluid conduit; a fluid mixer disposed along the fluid conduit; a sample port configured to receive from a flowline a fluid sample withdrawn from a subterranean formation, the sample port being in fluid communication with the fluid conduit at a location between the open end of the first variable-volume reservoir and the fluid mixer, wherein the reactant is different from the fluid sample and a selectable mixture of the reactant and the fluid sample is obtainable by varying volumes of the first and second variable-volume reservoirs.