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Fluorinated gas tracer, application, and monitoring and tracing method

A tracer and gas technology, which is used in measurement, measurement device, earth-moving drilling, etc., can solve the problems of limited grasp of the dynamic situation of on-site gas wells, not many tracer materials, and few gas tracers, etc., and achieves easy detection. Good chemical stability, less injection effect

Inactive Publication Date: 2018-11-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, domestic research on gas tracers is less, and there are not many available tracer materials, and the degree of grasping the dynamic conditions of on-site gas wells is severely limited

Method used

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  • Fluorinated gas tracer, application, and monitoring and tracing method
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  • Fluorinated gas tracer, application, and monitoring and tracing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] There are 27 oil and water wells in block A of an oil field in China, including 21 oil wells, 19 open wells, 4 water injection wells and 2 gas injection wells.

[0126] The fluorinated gas tracers F221 and F211 are injected into two gas injection wells from the wellhead through the high-pressure pump. The amount of tracer per well: 100kg, injection pressure: 4MPa, injection rate: 25L / h;

[0127] Sampling is carried out at the head of the monitoring well with a sampling bag according to the cycle, the cycle is sampling once every 12 hours at the beginning of the injection of the fluorinated gas tracer, and sampling once every 24 hours after the tracer is detected in the sample taken, Samples were taken every 12 hours after the peak tracer levels detected in the samples taken;

[0128] Adopt gas chromatograph to detect the tracer content in the sample taken, and adopt CN2720114Y (application date: 2004.6.2; application number: 200420064605.9; utility model name: gas tra...

Embodiment 2

[0131] Monitoring and tracing of steam huff and puff wells in an oilfield in China: fluorinated gas tracers F-703, F-221, F-211, and F-2111 were injected into 4 steam injection wells and brine stages respectively. The procedure is as in Example 1, the amount of tracer in a single well: 200kg, the injection pressure: 5MPa, the injection rate: 20L / h; 38 surrounding monitoring wells were opened for production and sampling inspection, specific sampling period, sampling method and detection conditions As in Example 1.

[0132] The test results showed that tracers were detected to varying degrees in the 21 first-line and second-line production wells around the huff and puff wells, and steam channeling wells accounted for 55.26% of the total number of monitored wells, which proved that steam channeling was common after multiple rounds of huff and puff; The channeling speed is between 5 and 115m / d, the average speed is 57.6m / d, and the steam channeling is serious.

Embodiment 3

[0134] A gas well in W Oilfield in China is undergoing multi-stage (6-stage) fracturing construction, that is, the well has 6 gas-producing layers. In order to test the effect of multi-stage fracturing on each layer and the reservoir conditions of each layer, 6 Level gas fracturing tracer. Inject 6 kinds of gas tracers into 6 target layers along with fracturing fluid and proppant in 6 layers, 1: F-201, 2: F-603, 3: F-703, 4: F-402: 5: F-2111:6:F-221. After fracturing, the borehole is waited for flowback. After 1 day of boredom, the well was opened to detect the output at the wellhead. From the detection of the output, it can be seen that F-703 was detected first, and then F-603, F2111, F201, F211, and F402 tracers were detected. From this, it can be seen that the 3-layer fracturing effect of this well is better, and the gas sees the fastest , and the production of the reservoir is good, which will lay the foundation for the further development of the formation in the next s...

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Abstract

The invention provides a fluorinated gas tracer, an application and a monitoring and tracing method. The fluorinated gas tracer comprises a combination of more than two or three kinds of monochlorodifluoromethane, dichlorodifluoromethane, difluoro-chloro-bromomethane, tetrafluoroethane, difluoroethane, difluoromethane, monochlorotetrafluoroethane, heptafluoropropane and hexafluoropropane. The invention also provides an application of the fluorinated gas tracer to monitoring and tracing in steam flooding, steam huff and puff, immiscible flooding, miscible flooding, carbon dioxide flooding, natural gas flooding or non-condensable gas well groups. The invention further provides an oilfield inter-well monitoring and tracing method. The method comprises the steps of adding the aforementioned fluorinated gas tracer to a gas injection well, sampling according to a cycle, and detecting the content of the tracer in the sample.

Description

technical field [0001] The invention relates to a fluorinated gas tracer and its application and monitoring and tracing method, belonging to the technical field of oil production engineering. Background technique [0002] With the continuous improvement of oilfield development level, tracers are more and more widely used in oilfields due to their unique properties. Oilfield cross-well tracing technology is an important technology for dynamic monitoring in the process of oilfield development, and an important technical means for studying the flow direction, propulsion speed and formation connectivity of oilfield injection fluid. Oilfield tracer is a substance that must be used in oilfield interwell tracer technology. Its properties must have the characteristics of good stability, less formation adsorption, good synchronization with injected fluid, safety and non-toxicity, etc. Its detection technology should meet the requirements of easy detection, sensitivity high demands. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V15/00E21B47/10
CPCE21B47/11G01V15/00
Inventor 郭韬陈威周飞
Owner PETROCHINA CO LTD
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