Apparatus and method for monitoring carbon dioxide flux of soil in aeration zone of gas injection oil displacing oil well

A carbon dioxide and monitoring device technology, which is applied in measuring devices, sampling devices, sampling, etc., can solve the problems of inaccurate flux measurement, achieve high frequency, realize continuous background correction and dynamic air pressure balance, and achieve high monitoring accuracy.

Inactive Publication Date: 2018-10-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome prior art to CO 2 To solve the technical problem of inaccurate flux

Method used

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  • Apparatus and method for monitoring carbon dioxide flux of soil in aeration zone of gas injection oil displacing oil well
  • Apparatus and method for monitoring carbon dioxide flux of soil in aeration zone of gas injection oil displacing oil well
  • Apparatus and method for monitoring carbon dioxide flux of soil in aeration zone of gas injection oil displacing oil well

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0031] This embodiment provides a figure 1 The gas injection flooding wellsite soil carbon dioxide flux monitoring device in the aerated zone shown includes a gas production column 1 connected in sequence, a gas parameter monitor 2, a gas production pump 5, and an infrared gas analyzer 6. The infrared gas analyzer 6 Electrically connected to a data transmission module 7, the gas extraction pump 5 is electrically connected to an air extraction pump action controller 4, and the gas extraction pump action controller 4 is electrically connected to the data transmission module 7;

[0032] Described gas collection column 1 is provided with temperature sensor 1-2, soil moisture sensor 1-1 and pressure balance valve 1-9, and the collection of described gas collection column 1 includes the collection of sample gas and the collection of reference air, so The gas parameter monitor 2, the temperature sensor 1-2 and the soil moisture sensor 1-1 are all electrically connected to a recording...

Embodiment 2

[0036]On the basis of Embodiment 1, this embodiment provides a monitoring device for soil carbon dioxide flux in the aerated zone of the gas injection flooding well site, and the gas production column 1 includes a depth positioning rod 1-4 and a gas production box 1-3 , gas collection cover 1-7, pressure balance valve 1-9, temperature sensor, soil moisture sensor and emptying valve 1-5, the upper end of the gas collection box 1-3 is connected and sealed with the depth positioning rod 1-4, the The lower end of the gas collection box 1-3 is open, the gas collection hood 1-7 is arranged in the gas collection box 1-3, and the straight pipe on the upper part of the gas collection hood 1-7 passes through the depth positioning rod 1-4 and the gas Parameter monitor 2 connection;

[0037] The temperature sensor 1-2, the soil moisture sensor 1-1 and the pressure balance valve 1-9 are all arranged in the gas collection box 1-3, and the pressure balance valve 1-9 is connected to the empty...

Embodiment 3

[0043] On the basis of the gas injection flooding wellsite soil carbon dioxide flux monitoring device in Example 1, this embodiment provides a soil carbon dioxide flux monitoring method, which includes the following steps:

[0044] Step 1) Carry out soil drilling at the monitoring point, insert the gas extraction column 1 after reaching the target depth, and connect all components;

[0045] Step 2) Turn on the gas sampling pump 5, and keep the sample gas collection flow consistent with the reference air collection flow, and monitor the CO in the sample gas by the infrared gas analyzer 6. 2 Concentration and reference air CO 2 Concentration, and pass to data transmission module 7;

[0046] Step 3) The sample gas and reference air flow rate, air pressure and temperature sensor 1-2 detected by the gas parameter monitor 2, and the soil moisture content detected by the soil moisture sensor 1-1 are all recorded in the recording module 3, and used The data transmission module 7 is ...

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Abstract

The invention provides an apparatus and method for monitoring the carbon dioxide flux of soil in the aeration zone of a gas injection oil displacing oil well. The apparatus comprises following serially connected components: a gas collection column, a gas parameter monitoring instrument, a gas collection pump, and an infrared gas analyzer, which is electrically connected to a data transmission module. A temperature sensor, a soil water sensor and a pressure balancing valve are arranged in the gas collection column. The gas collection column collects sample gas and reference air. By setting airreference measurement and the pressure balancing valve, continuous background correction and dynamic air pressure balance of soil gas are realized; the influence of air pressure turbulence during thelong period of continuous CO2 sampling process is eliminated; and the soil gas temperature, water content of soil, air background temperature, and air pressure are measured in real time so as to remove the interference of environmental factors on the CO2 flux measurement accuracy. Compared with a conventional measuring method, the provided method has the advantages of high monitoring accuracy, little environmental background interference, and large change range of monitoring depth.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring, and in particular relates to a device and method for monitoring carbon dioxide flux in gas-injection well site vadose zone soil. Background technique [0002] Carbon dioxide gas flooding enhanced oil recovery (CO 2 -EOR) technology utilizes the characteristics of high solubility of carbon dioxide in both oil and water, and converts high-purity CO 2 The gas is injected into the oil layer using related technologies to extract the C in the crude oil. 20 The following light components may be gasified, which is conducive to the rapid formation of miscible phases in the formation. The miscible section expands the swept volume and drives more formation oil, which can effectively enhance the recovery of crude oil. [0003] But CO 2 -EOR will put a lot of CO 2 Stored underground, there may be two kinds of leakage in this process: one is sudden leakage, such as leakage caused by inject...

Claims

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Application Information

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IPC IPC(8): G01N1/22G01D21/02
CPCG01D21/02G01N1/2294
Inventor 朱妍周立辉张璇穆谦益冀忠伦李照林张海玲邱奇同霄蒋继辉
Owner PETROCHINA CO LTD
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