Experimental Research On The Fluorescent Tracer Technique Between Wells In Zhongyuan Oilfield

The inter-well tracer detection technology is an important method to monitor the fieldperformance and evaluate the heterogeneity in the water-flooding oil field. As the onlymaterial that can get into the underground reservoir and carry out the developmentinformation, tracers have been widely used in the oil exploration and production process.After years of development and construction, the chemical tracers can no longer satisfy theincreasing demand for multi-layer water flooding detection in ZhongYuan Oilfield. Aiming atthese problems, the paper chooses fluorescent tracer as the new generation of tracers, thencarries out theoretical and experimental research on it.The paper firstly evaluated the application effect of the current chemical tracers inZhongYuan Oil field, and analyzed its shortcomings and deficiencies. Then studied the tracerflow behavior in the reservoirs, and obtained the tracing mechanism of fluorescence analysistechnique. After that we optimized the related calculation models, updated the tracer amountdesigning and curve interpretation models. At last, based on the tracing mechanism andselection principles, the paper makes a primary election among the common fluorescentmaterial in industry, chooses YG-1and CA-2as the new fluorescent tracers to carry out theevaluation and optimization laboratory experiment.To evaluate the fluorescence properties of the selected tracers, the paper carried out aseries of laboratory experiment on its compatibility, influencing factors of fluorescenceintensity and absorption quantity. The compatibility experiment shows that both of the twotracers have good compatibility with the injected water and produced water; The experimentof influencing factors indicated that resting time, common ions and additives do not affect thefluorescence intensity too much, but the solution temperature, concentration and PH valuehave great influence on it, the temperature resistance and acid-base resistance of CA-2areslightly worse compared with YG-1; The static adsorption experiment determined the twotracers’ absorbability, showing that both of their adsorption rate are5%or so, and CA-2less.Finally the paper summed up all the evaluation indicators above, and decided to choose YG-1as the new tracers for ZhongYuan Oilfield.To evaluate the chosen tracer’s application result, the paper selected two injection-production well groups (Wen13-195and Wen92-77) to carry out a field test. Wedesigned the injection technology, calculated the construction parameters, and then made aconstruction plan. By means of analyzing the tracer production curves, we make clear of thegroups’ connected situations, water injection allocation and the high-permeability layer’sparameters, find out the existing problems in the development process, and then bring forwardsome suggestions for the well groups’ subsequent construction and the development of tracer.By the use of combing theoretical research with laboratory and field tests, the papereventually selected an inter-well tracer, which has high detection sensitivity, simpleconstruction technology and less formation pollution. Above all, this paper is quite importantfor the water-flood monitoring and fine reservoir description work of ZhongYuan Oilfield.