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Oilfield tracking and analysis detecting method
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A kind of fluorobenzoic acid, detection method technology, applied in the field of oil field tracer and its analysis and detection
Inactive Publication Date: 2006-07-05
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology
In particular, most of the oil reservoirs in the Northwest Oilfield in China are high-temperature oil reservoirs, and the existing oilfield tracing methods cannot solve the problem of oilfield tracing well, and there is no tracer method suitable for high-temperature oilfields in China; in addition, the Northwest High-temperature Oilfield The formulation and adjustment of the development plan in the process of secondary mining and tertiary mining requires a large amount of analytical data. Therefore, it is very necessary to develop more and better tracer methods and high-sensitivity analysis methods
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Embodiment 1
[0027] Firstly, put fluorobenzoic acid into the oil well like other non-release tracers and take samples, and then get relevant data through pretreatment and analysis.
[0028] 1. Sample pretreatment:
[0029] (1) Sample filtration. Filter with a 0.45μm filter membrane to remove fine solid matter and drop-shaped crude oil.
[0030] (2) Add an internal standard substance and adjust the pH value of the sample. Select 4-trifluoromethylbenzoic acid as the internal standard, and the concentration (150, 250) of 200ng / ml is advisable to add, then adjust the pH value to 1.5 (1, 2) to make it consistent with the medium environment of the extraction column In order to facilitate the extraction of analytes.
[0031] (3) For solid phase extraction and desorption of the analyte, cross-linked polystyrene is selected as the adsorbent of the solid phase extraction column. The specific extraction steps are
[0032] ①Activation: First soak the extraction column with acetonitrile, then rins...
Embodiment 2
[0053]Corresponding to Example 1, other conditions remain unchanged, when relevant parameters such as pH value, temperature, carrier gas flow rate and time all adopt the first value in brackets, the measurement effect is: the minimum detection degree is 0.004 μ g / L; The width range is 0.02~4μg / L; the spanning concentration multiple is 200; R^2≥0.999.
Embodiment 3
[0055] Corresponding to Example 1, when the relevant parameters adopt the second group of values in brackets, the measurement results are as follows: the minimum detection degree is 0.002 μg / L; the curve width range is 0.01-2 μg / L; the crossing concentration multiple is 200; R^2 ≥0.999.
[0056] In this work, 2-fluorobenzoic acid is used in the analysis of fluorobenzoic acids, which is very representative. Because the molecular volume of monofluorobenzoic acid is the smallest, the interaction with the adsorbent is also the weakest, and because 2-fluorobenzoic acid has an F atom in the ortho position, there is a steric hindrance effect in the derivatization process. In comparison, Under the same conditions, the ortho-substitution of 2-FBA is more difficult than the meta- and para-substitution of 3-FBA and 4-FBA. In addition, it has been proved by literature that the benzoic acid substituted by F atom at the ortho position has the smallest leakage volume on the same solid-pha...
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Abstract
It is a kind of oil field tracing and its analysis and measuring method, which in detail relates to a method using non-discharge water-soluble reagent as tracer for the oil field tracing. The tracing method is to adopt fluobenzoic acids as tracer and takes some preprocessing means such as filtering, deriving and solid state abstraction in the measuring, then to take trace analysis of the tracer though gas chromatography-mass spectrometry combination technique. This method is of high accurate for measuring the FBAs and can greatly decrease the tracer amount so to reduce the cost and make it possible to use fluobenzoic acids in national high- temperature oil field and compensate the shortcomings of the tracers in our oil field.
Description
technical field [0001] The invention relates to an oilfield tracer and its analysis and detection method, in particular to a tracer and its analysis and detection method using a non-water-soluble reagent as an oil well tracer. Background technique [0002] At present, water injection development is the main production mode of oil fields in my country and many countries in the world. Interwell tracer tests have been used to determine the underground movement and directional heterogeneity of oilfield injected water for many years. Water flooding interwell tracer tests are to add specific tracers to injected water from water injection wells. Sampling and analysis of the concentration of the tracer in the surrounding oil production wells to obtain the change curve of the concentration of the tracer with time, and then conduct a comprehensive analysis to obtain information about the field boundary, swept volume, directional flow, abnormal injection well, and the relative velocity...
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