Trace element detection method among wells

Abstract

The invention belongs to the technical field of tracing tests, and particularly relates to a trace element detection method among wells. The trace element detection method among the wells includes following steps: screening trace element tracer, calculating the use amount of the trace element tracer, injecting the trace element tracer into a water injection well after the use amount of the trace element tracer is figured out, sampling and detecting the trace element tracer, performing fitting on a trace element tracer production curve, figuring out stratum parameters, performing dynamic and static analysis on an oil well of a monitored well area, using a half analytic method to analyze, process and explain tracing monitoring information, and quantitatively or qualitatively acquiring static and dynamic information among oil reservoir wells, among layers of each oil reservoir well, in each layer of each oil reservoir well and around the oil well of the monitored well area; performing geologic modeling, obtaining a characteristic parameter variation rule, performing numerical simulation calibration and perfection, evaluating measure development effects, and designing measure technological parameters. The trace element detection method among the wells is simple and convenient to operate, low in cost and wide in application prospect.

Description

【Technical field】 [0001] The invention belongs to the technical field of tracer testing, and in particular relates to a trace element monitoring method between wells. 【Background technique】 [0002] With the direction of fine water injection and fine steam injection in reservoir development, the production test is gradually changing to the direction of fine stratification test, and the means of reservoir monitoring are becoming more and more important. The interwell tracing method is an important means to describe the heterogeneity and fluidity of interwell oil layers. Through this technology, the characteristics of well group connectivity, high permeability layers between oil and water wells, fault properties and remaining oil saturation evaluation can be determined. The interwell tracer test is to inject tracer into the water injection well, and monitor the output of the tracer in the surrounding production wells. If there is tracer in the production well, it proves that t...

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Problems solved by technology

2) Fluorescent dyes: such as anionic dyes such as carmine and alizarin, but these dyes have a large amount of adsorption on the surface of the formation, and some components in the formation will interfere with the analysis, so they cannot stay in the formation for more than 5 days. use

3) Halogenated hydrocarbons and small molecule alcohols: such as fluorotrichloromethane, trichloroethylene, dibromopropane, etc. They have less adsorption on the surface of the formation and are easy to be detected by gas chromatography, but they will affect the post-processing of crude oil. influential

In recent years, with the expansion of the application range of polymer flooding and weak gel flooding, formation water quality has changed, which has brought many difficulties to the detection and results of chemical tracers, and even some tracers cannot be detected. Can't achieve expected effect

2. Radioactive isotope tracers mainly contain tritiated compounds, such as tritiated water, tritiated hydrogen, tritiated heptane, etc. Although such tracers have the advantages of less dosage, convenient detection and high detection resolution, they are It is radioactive, which is unfavorable to the safety of personnel and the environment, and is greatly restricted in application

3. Stable isotope tracers have the characteristics of no high-temperature conversion, no radioactive hazards, less dosage, convenient on-site operation, and high measurement accuracy. However, there are relatively few varieties of stable isotope tracers, and some samples still need to pass through the indoor laboratory after sampling. The nuclear reactor is activated, and its radioactivity is measured by the neutron activation method. It can only be tested indoors by the IAEA. The analysis and testing methods are complicated and expensive, and its application is limited.

However, the existing inter-well monitoring methods for trace elements are cumbersome, costly, and costly in manpower and material resources.