Complex tracer for interwell monitoring in high temperature and high salinity block in oilfield and its application

A high salinity and tracer technology, applied in construction and other directions, can solve the problem that tracers cannot withstand high temperature and high salinity at the same time, and achieve the effect of less reagent dosage, good effect and broad application prospects.

Active Publication Date: 2016-03-09
PETROCHINA CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to overcome the technical problem that the tracer in the prior art cannot resist high temperature and high salinity at the same time, provide a tracer that can resist high temperature and high salinity at the same time, and overcome the impact of high salinity on the tracer at the same time. Tracer analysis accuracy and the impact of analytical instruments, providing a tracer separation and enrichment method

Method used

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  • Complex tracer for interwell monitoring in high temperature and high salinity block in oilfield and its application
  • Complex tracer for interwell monitoring in high temperature and high salinity block in oilfield and its application
  • Complex tracer for interwell monitoring in high temperature and high salinity block in oilfield and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The five novel tracers screened out in this example are erbium hydroxylamine chloride, gadolinium hydroxylamine chloride, dysprosium hydroxylamine chloride, ytterbium hydroxylamine chloride, and holmium hydroxylamine chloride. The following experiments were carried out on these five new tracers:

[0032] (1) Tracer interference and compatibility experiments

[0033] The purpose of the compatibility test is to determine the compatibility of the tracer with the high-salinity formation water. The test method is as follows:

[0034] Five tracers of erbium hydroxylamine chloride, gadolinium hydroxylamine chloride, dysprosium hydroxylamine chloride, ytterbium hydroxylamine chloride, and holmium hydroxylamine chloride (respectively erbium chloride, gadolinium chloride, and dysprosium chloride) at the same concentration , ytterbium chloride, holmium chloride and hydroxylamine chloride in a molar ratio of 1:8 mixed for complexation reaction) mixed, and then mixed with the salin...

Embodiment 2

[0052] The research of embodiment 2 enrichment method

[0053] If the high-salinity formation water samples obtained on site are directly analyzed with tracers, there are mainly the following technical difficulties:

[0054] 1) The background of high salinity will produce serious matrix effect, which will interfere with the analysis of the tracer.

[0055] 2) High salinity will cause blockage of the atomization system and sampling system of the instrument.

[0056] Therefore, an effective separation and enrichment method must be adopted before the determination to separate tracer elements from a large number of matrix elements and concentrate them.

[0057] Extraction chromatography is used for separation and enrichment, which combines the advantages of both liquid-liquid extraction and chromatography, with less reagent consumption and good separation and enrichment effects. Take 500mL or an appropriate amount of sample, and use NH 3 .H 2 O and HNO 3 Adjust its pH to 2.5-...

Embodiment 3

[0059] Embodiment 3 tracer practical application analysis

[0060] In this embodiment, tracers of erbium hydroxylamine chloride, gadolinium hydroxylamine chloride, dysprosium hydroxylamine chloride, ytterbium hydroxylamine chloride, and holmium hydroxylamine chloride series were used at high temperature (the temperature of the 5 well groups was between 275°C and 288°C) The 5th well group of the salinity (the salinity of the block where the 5th well group is located is 19850mg / L) has carried out the actual tracer analysis and detection. A single tracer is put into each well, and samples are taken regularly for analysis every day. The separation of the samples is rich. The collection method is carried out according to the method of Example 2, and the detection period is 90 days.

[0061] Figure 1 to Figure 5 The detection and analysis results of the five tracers are shown respectively. It can be seen that the tracer provided by the present invention has an analytical accuracy...

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Abstract

The invention provides a complex tracer agent for oil field high-temperature hypersalinity block interwell monitoring and the application thereof. The tracer agent comprises one or more of chlorinated hydroxylamine erbium, hydroxylamine gadolinium chloride, chlorinated hydroxylamine dysprosium, chlorinated hydroxylamine ytterbium and chlorinated hydroxylamine holmium, and the tracer agent is formed by a tracer element and a complexing agent in a complexing mode. The tracer element is selected from one or more of erbium, gadolinium, dysprosium, ytterbium and holmium, the complexing agent is hydroxylammonium chloride, and the molar ratio between the tracer element and the complexing agent is 1:8-1:9 and preferably is 1:8. The tracer agent can resist high temperature (250 DEGC-300 DEG C) and hypersalinity (5000mg / L-20000mg / L). The invention further provides a tracer method for conducting the oil field high-temperature hypersalinity block interwell monitoring by means of the tracer agent, and the method comprises the process of conducting separation and enrichment on the tracer agent in a taken sample.

Description

technical field [0001] The invention relates to a complex tracer for interwell monitoring of high-temperature and high-salinity blocks in oilfields and its application, in particular to a complex tracer suitable for high-temperature (250°C-300°C) high-salinity (5000mg / (L~20000mg / L) complex tracer used in interwell dynamic monitoring technology of block, the preparation method of said tracer, said tracer is shown in interwell monitoring of oilfield high temperature and high salinity block The application in the tracer and the interwell monitoring and tracer method of high-temperature and high-salinity blocks in the oil field using the tracer include the process of separating and enriching the tracer in the sample taken. Background technique [0002] Interwell tracer monitoring technology in oil field is a dynamic monitoring technology widely used in oil fields at present. It has made great progress in recent years. There are more and more types of tracers, and the analysis a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/11
Inventor 张洪君王浩龙华赵跃朋王运萍崔加利王丽华王楠郑猛闫峰赵明国王强黄太明汤学志刘国忠李宝莹
Owner PETROCHINA CO LTD
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