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Oil field tracer and oil field tracing method

A tracer and oil field technology, applied in the field of oil field analysis, can solve the problems of high cost, easy adsorption by rocks, unfavorable large-scale popularization and application, etc., and achieve the effects of easy detection, environmental friendliness, and excellent environmental stability.

Pending Publication Date: 2020-06-09
SUZHOU XINGSHUO NANOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These tracers all have disadvantages in varying degrees: chemical tracers are used in a large amount, cost is high, and are easily adsorbed by rocks; isotope tracers require professional construction personnel and use special equipment for detection, which is not conducive to large-scale application; Substance tracers require high-end analytical equipment such as inductively coupled plasma mass spectrometry, etc.

Method used

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  • Oil field tracer and oil field tracing method
  • Oil field tracer and oil field tracing method
  • Oil field tracer and oil field tracing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] The preparation method of fluorescent carbon quantum dot in embodiment 1 is as follows:

[0086] Put 1g of 3,4,9,10-tetranitroperylene in a 500ml beaker, add 200ml of ethanol, 3g of NaOH and 1g of sodium citrate, and ultrasonically dissolve to obtain a mixed solution. Afterwards, the mixed solution was poured into a 300ml stainless steel hydrothermal reaction kettle with a polytetrafluoroethylene liner, reacted at 200°C for 12 hours, and separated and purified to obtain fluorescent carbon quantum dots to be functionalized with amino groups.

[0087] Then carry out amino modification on the surface of the fluorescent carbon quantum dots to be amino-functionalized: in a 250ml three-necked flask, mix 1g of the above-mentioned fluorescent carbon quantum dots to be amino-functionalized, 100ml of ammonia, and 2g of sodium bisulfate. Then it was poured into a 300ml stainless steel hydrothermal reaction kettle with polytetrafluoroethylene lining, and reacted at 200°C for 12 hou...

Embodiment 2

[0090] The preparation method of fluorescent carbon quantum dot in embodiment 2 is as follows:

[0091] Put 1g of 3,4,9,10-tetranitroperylene in a 500ml beaker, add 200ml of ethanol, 3g of NaOH and 1g of sodium citrate, and ultrasonically dissolve to obtain a mixed solution. Afterwards, the mixed solution was poured into a 300ml stainless steel hydrothermal reaction kettle with a polytetrafluoroethylene liner, reacted at 200°C for 12 hours, and separated and purified to obtain fluorescent carbon quantum dots to be functionalized with amino groups.

[0092] Then carry out amino modification on the surface of the fluorescent carbon quantum dots to be amino-functionalized: in a 250ml three-necked flask, mix 1g of the above-mentioned fluorescent carbon quantum dots to be amino-functionalized, 100ml of ammonia, and 2g of sodium bisulfate. Then it was poured into a 300ml stainless steel hydrothermal reaction kettle with polytetrafluoroethylene lining, and reacted at 200°C for 12 hou...

Embodiment 3

[0095] The preparation method of fluorescent carbon quantum dot in embodiment 3 is as follows:

[0096] After placing 1 g of citric acid, 2 ml of polyethylene glycol and 20 ml of deionized water in a 50 ml hydrothermal reaction kettle, they were reacted at 180° C. for 12 hours to obtain the final fluorescent carbon quantum dots. The obtained fluorescent carbon quantum dots can be dispersed in water phase or oil phase.

[0097] The mode of using fluorescent carbon quantum dots in the embodiment 3 for oil field tracing is as follows:

[0098] Take a blank petroleum sample (an oil-water mixture containing water and oil), and after adding the fluorescent carbon quantum dots in Example 3 (simulating the oil-water mixture to be detected in the production well), take an appropriate amount of the above-mentioned fluorescent carbon quantum dots. After pointing the petroleum sample, add 10 ml of ethanol solution, followed by excess sodium hydroxide (NaOH) and 3 ml of ammonia water. Af...

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Abstract

The invention provides an oil field tracer and an oil field tracing mode. The oil field tracing method comprises steps that an oil field tracer agent is added into an oil field injection well, and theoil field tracer agent comprises fluorescent carbon quantum dots; oil-water mixture at the oil field production well is obtained; and whether the fluorescent carbon quantum dots exist in the oil-water mixture or not is analyzed. The oil field tracer agent is detected in the oil-water mixture of the oil field production well, the method is not limited by an oil-water ratio of a to-be-detected sample obtained at the oil field production well, and requirements of various oil field environments can be met. The polar solvent is used for extracting the fluorescent carbon quantum dots in the oil-water mixture, part of the fluorescent carbon quantum dots in the oil can be transferred into the polar solvent, and the fluorescent carbon quantum dots can be detected in the polar solvent, so the fluorescent carbon quantum dots are prevented from being interfered by background substances in petroleum when being directly detected in the oil.

Description

technical field [0001] The application belongs to the field of oilfield analysis, and in particular relates to an oilfield tracer and an oilfield tracer method. Background technique [0002] Oilfield tracer technology is one of the on-site production test technologies. Its technology is to add tracer from the oilfield injection well, and then take samples from the surrounding oilfield production wells according to certain sampling regulations, and monitor the process of the tracer, so as to guide The design of oil well production and the adjustment in the late stage of oil field development. Oilfield tracers can qualitatively describe reservoir conditions, such as: the direction and velocity of injected fluids, the evaluation of volumetric sweep efficiency, fluid occlusion, directional flow trends, heterogeneous characteristics of reservoirs, and determination of remaining oil saturation and distribution Wait. [0003] For a long time, the tracers commonly used in oilfield...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V15/00E21B49/00E21B47/10
CPCG01V15/00E21B49/00
Inventor 王允军刘东强马成华
Owner SUZHOU XINGSHUO NANOTECH CO LTD
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