Tracing quantum dot water injection cross-section logging method
A technology of quantum dots and water injection wells, applied in construction and other fields, can solve the problems of difficult quantitative interpretation, inaccurate measurement results, and high measurement costs, and achieve the effect of enriching profile logging data, intuitive and accurate logging data, and accurate measurement results
Inactive Publication Date: 2015-01-21
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology
Among them, flow meter logging is convenient for quantitative calculation and has high interpretation accuracy, but requires complex equipment and high measurement cost
Although the well temperature logging can not be limited by the pipe string, and is not affected by temperature, pressure pollution and impurity geological factors, but the stratification is poor, and quantitative interpretation is difficult
Radioactive isotope logging has good stratification, but there are many influencing factors and the measurement results are inaccurate
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[0019] The present invention will be further described below in conjunction with accompanying drawing:
[0020] First, an overview of this program: quantum dots (Quantum dots, QDs), also known as semiconductor nanocrystals (Semiconductor nanocrystal), is a kind of Ⅱ-Ⅵ group (such as CdSe, CdTe, CdS, ZnSe, etc.) or Ⅲ-Ⅴ group (such as InP , InAs, etc.) elements composed of nanoparticles. The electrons in semiconductor quantum dots have unique luminous properties. After the quantum dots are irradiated with laser light, the quantum dots can continue to emit light for several hours. Since the quantum dots emit visible light of different colors, if we adsorb the luminescent quantum dots on spherical carriers of different sizes, the spherical carriers of different sizes become tracer carriers. In the case of normal water injection in the water injection well, the tracer carrier is injected into the well along with the water, and will eventually filter and accumulate on the water inj...
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The invention relates to a tracing quantum dot water injection cross-section logging method, and mainly aims at providing a novel water injection well cross-section logging method which is accurate in measurement. The method comprises following steps of preparing different spherical transparent quantum dot carriers with different sizes; placing the prepared carriers into a wellhead releasing device of a water injection well to be radiated by laser; releasing the spherical transparent quantum dot carriers, and facilitating the spherical transparent quantum dot carriers to form suspension liquid with liquid inside the water injection well; utilizing an optical imaging technology to detect the dynamic distribution of the spherical transparent quantum dot carriers in the well, and transmitting the detected dynamic distribution image back to a ground computer; and obtaining light density distribution of different frequencies according to the detected image so as to calculate a porosity and relative water injection quantity of the water injection cross section. By analyzing the detected light density distribution of different frequencies, the porosity and the relative water injection quantity of the water injection cross section can be obtained; and meanwhile, the dynamic situation of the water injection can be controlled according to the distribution of the quantum dot carriers with different sizes in the well so as to obtain the cross-section logging data.
Description
technical field [0001] The invention relates to a method applied in profile logging of water injection wells. Background technique [0002] At present, there are many logging methods to reflect the water absorption capacity of water injection wells, mainly including flow meter logging, well temperature logging and radioisotope logging. Among them, flow meter logging is convenient for quantitative calculation and has high interpretation accuracy, but requires complex equipment and high measurement cost. Although the well temperature logging can not be limited by the pipe string, and is not affected by temperature, pressure pollution and impurity geological factors, but the stratification is poor, and quantitative interpretation is difficult. Radioisotope logging has good stratification, but there are many influencing factors and the measurement results are inaccurate. Contents of the invention [0003] In order to solve the technical problems mentioned in the background ...
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IPC IPC(8): E21B47/11
Inventor 王升康云孙永河李贤丽白永强
Owner NORTHEAST GASOLINEEUM UNIV
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