Synthetic method and application of 'BYC tracer agent'

Abstract

The invention relates to a synthetic method and application of a 'BYC tracer agent'. A rare earth element tracer method is one of effective methods to detect oil reservoirs in oil fields. A fluorescent nanomaterial with a core-shell structure is synthesized and can be used as an oil field tracer agent which is named as the 'BYC tracer agent'. The tracer agent has the advantages that the water solubility is good, the use amount is small, the exploration demand quantity of water samples is few, the analytical method is simple and convenient, and the analysis sensitivity is high; the tracer agenthas no radioactivity, low toxicity and a minimal impact on the environment; the degree of mineralization is not affected, the compatibility with polymers is good, and oil displacing of the polymers is not affected; the application of the BYC tracer agent, that is, the fluorescent nanomaterial in the field of oil field exploration is creatively achieved, and a feasible operation scheme is proposed.

Description

technical field [0001] The present invention relates to a synthesis method and application method of a new type of tracer——"BYC tracer". During the synthesis process, the innovative use of the "multi-phase ion alternate transfer method" successfully synthesized "BYC tracer", which is a fluorescent nanomaterial with a core-shell structure, especially as an oil field well tracer. It plays an important role in detecting reservoirs and testing the distribution and movement of reservoir fluids. Background technique [0002] In the water injection development of complex fault-block oilfields, due to the heterogeneity of the oil layer itself, high permeability zones or large pores will gradually form between oil and water wells, the efficiency of water flooding will decrease, the water cut of oil wells will rise sharply, and the development effect will obviously deteriorate. The tracer can qualitatively judge the existence of high permeability zones or large pores, and the interwe...

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Problems solved by technology

[0003] First, there are few types of tracers that can be widely used in oil fields at present, which is due to the many limitations of the nature of the tracer itself and the types and physical and chemical properties of the formation minerals

[0004] Second, commonly used tracers are anions, dyes, low-molecular alcohols, etc. that are easy to detect. Such tracers use a large amount (up to several tons), are highly toxic, require a large amount of water samples, and have low analytical sensitivity. Shortcomings such as long measurement cycle are not conducive to environmental friendliness

[0005] Its three, the use of ammonium thiocyanate, sodium bromide, potassium iodide also can make salinity increase, has influenced the viscosity of polymer solution, because the influence of polymer, the error that sodium bromide, potassium iodide detects is bigger, and potassium iodide The high cost makes the use of both limited

[0006] Fourth, artificial radioactive substances—— 60 Co. 3 H. 82 Br, etc., due to the high difficulty of detection, it is not easy to realize on-site detection, and its use is limited; with the improvement of environmental protection requirements, this substance will also be gradually eliminated

[0007] Fifth, titration is currently one of the most commonly used methods for determining the content of rare earth elements. However, this method has many steps. After repeated extractions, the error of separation operation is large and the measurement period is long; at the same time, the error caused by human differences In the case of the same analysis conditions, increasing the concentration of rare earth elements is one of the effective solutions to improve the analysis accuracy, but the increase in the concentration of rare earth elements leads to the increase of its use cost, so in oil field detection of oil reservoirs In practical applications, rare earth tracers are not commonly used in order to control costs

[0008] Sixth, the previous fluorescent tracers used a large amount, the cost was high, and their chemical and physical properties were unstable in the formation. Inorganic fluorescent materials are very easy to adsorb on the sediment and other small molecules or small particle sizes in the underground oil layer. On particles; organic fluorescent materials have poor chemical stability in complex underground environments, and are easy to react with other substances, causing tracer failure

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