A kind of high-efficiency zero-radioactive emission logging tracer and preparation method thereof

Abstract

The invention discloses a high-efficiency zero-radioactive emission logging tracer and a preparation method thereof, comprising the following steps: in a reaction container of a stirrer, radioisotopes are uniformly adsorbed by a porous carrier added with an impregnating agent; the radioactive solution is transferred to a sealed storage tank. In the liquid tank, the porous carrier adsorbed with most of the radioactive isotopes is blocked in the reaction vessel of the stirrer by the porous sieve plate; the porous carrier after the radioactive solution is filtered out by heating and drying; the organic solvent organic bag is added into the reaction vessel of the stirrer. The volatilized iodine gas and water vapor are adsorbed by the porous carrier filled in the exhaust pipe for the preparation of the next batch of logging tracers; when the next batch of logging tracers is circulated for preparation, the The porous carrier adsorbed with the radioactive gas, the radioactive liquid in the liquid storage tank and the supplemented radioactive liquid are successively transferred into the reaction vessel of the stirrer. Radioactive iodine-131 is completely used, with zero efflux, which is environmentally friendly and low-cost.

Description

technical field [0001] The invention relates to a high-efficiency zero-radioactive discharge logging tracer and a preparation method thereof, in particular to a high-efficiency zero-radioactive discharge solid isotope logging tracer used for water injection profile logging and a preparation method thereof. Background technique [0002] As my country's onshore oilfields gradually enter the middle and late stages of high water-cut development, the pressure of the reservoir gradually decreases, and the exploitation becomes more and more difficult. In order to maintain stable and high oil production, oilfields often use water injection to improve crude oil recovery. Not only old oilfields use the "water injection method" to recover oil, but some newly developed oilfields also perform water injection in the early stage of production to maintain the formation energy balance, so as to achieve "water injection". Water flooding”, maintaining formation pressure and enhancing oil and g...

AI Technical Summary

Problems solved by technology

However, in the existing liquid preparation process of radioactive iodine-131 logging tracer, the iodine-131 in the radioactive solution is adsorbed by the porous carrier through stirring, and the solution after adsorption is stirred openly together with the porous carrier, heated and evaporated to dryness. This process usually takes more than ten hours to evaporate to dryness. The preparation efficiency is too low for isotopes with short half-lives, and it increases the exposure time of relevant production personnel to radioactive substances.

In addition, during the evaporation process, the iodine-131 in the radioactive solution and the part of the iodine-131 that has been absorbed by the porous carrier are directly evaporated to dryness and discharged, and about half of the radioactive iodine-131 is discharged, which is prone to radiation pollution, and Causes huge waste of radioisotopes and increases production costs

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