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A Gas Production Column Used to Monitor Soil Carbon Dioxide Flux in the Gas-diffusing Zone of a Gas Injection Flooding Wellsite

A technology of carbon dioxide and vadose zone, which is applied to measuring devices, soil testing, sampling, etc., and can solve problems such as deviation and low measurement accuracy

Active Publication Date: 2021-05-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of deviation in existing monitoring results and low measurement accuracy, the present invention provides a gas production column for monitoring the flux of carbon dioxide in the soil in the gas-entrained well site of the gas injection flooding well site

Method used

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  • A Gas Production Column Used to Monitor Soil Carbon Dioxide Flux in the Gas-diffusing Zone of a Gas Injection Flooding Wellsite
  • A Gas Production Column Used to Monitor Soil Carbon Dioxide Flux in the Gas-diffusing Zone of a Gas Injection Flooding Wellsite

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Experimental program
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Embodiment 1

[0021] In order to overcome the problems of deviation in existing monitoring results and low measurement accuracy, the present invention provides a method such as figure 1 The gas production column shown is used to monitor the soil carbon dioxide flux in the gas-filled zone of the gas injection flooding well site. By setting a pressure balance valve in the dynamic gas recovery box, negative pressure is avoided during the gas collection process for measuring the carbon dioxide flux. The formation of the depth positioning rod improves the monitoring accuracy; while the end-to-end overlap of the depth positioning rod can realize the measurement of carbon dioxide flux in the soil layer within a large depth range, and can also simultaneously measure the temperature and soil moisture information at the target point.

[0022] The gas production column used to monitor the soil carbon dioxide flux in the aerated zone of the gas injection flooding well site, including the soil moisture s...

Embodiment 2

[0026] Based on the above embodiments, in this embodiment, the depth positioning rod 4 is connected to the dynamic gas collection box 3 through an airtight thread 6 .

[0027] The depth positioning rod 4 is made of stainless steel, and the rod body is provided with scales from bottom to top. The length of the depth positioning rod 4 is 1 ~ 3m, and both ends of the depth positioning rod 4 are provided with threaded buttons.

[0028] The depth positioning rod 4 is made of stainless steel, and the rod body is provided with scales from bottom to top, which can intuitively read the setting depth of the dynamic sampling box. The length of the depth positioning rod 4 is 1 ~ 3m, and both ends of the depth positioning rod 4 are provided with threaded fasteners, so that a plurality of positioning rods can be connected end to end to expand the scope of use of the positioning rods.

[0029] The dynamic gas collection box 3 is made of plexiglass material, with a thickness of 15-20mm, and t...

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Abstract

The invention provides a gas production column for monitoring the carbon dioxide flux of the soil in the gas-entrained wellsite of the gas injection flooding well site, including a soil moisture sensor, a temperature sensor, a dynamic gas production box, a depth positioning rod, an emptying valve, a gas collection hood, Porous plate, pressure balance valve and recording module; the upper end of the dynamic gas collection box is connected to the depth positioning rod, and the inner lower part of the dynamic gas collection box is provided with a gas collection hood and a porous plate, and the porous plate is located below the gas collection hood. The soil moisture sensor, temperature sensor and pressure balance valve are all arranged at the lower part of the gas collecting hood, and the upper end of the pressure balance valve is connected to the emptying valve through a pipeline; the soil moisture sensor, temperature sensor and the recording module are connected through cables. By setting the pressure balance valve in the dynamic gas collection box, the formation of negative pressure is avoided during the gas collection process for measuring the carbon dioxide flux, and the monitoring accuracy is improved; the temperature and soil moisture information at the target point can also be measured simultaneously.

Description

technical field [0001] The invention belongs to the field of environmental monitoring and relates to CO in soil 2 The release flux monitoring of the invention relates to a gas production column used for monitoring the carbon dioxide flux of the soil in the vadose zone of the gas injection flooding well site. 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. CO 2 -EOR will put a lot of CO 2 Stored underground, there may be two kinds of leakage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/22G01N33/24
CPCG01N1/2294G01N33/24
Inventor 朱妍周立辉张璇赵敏杨琴任鹏刘沛华李岩刘宁周娟
Owner PETROCHINA CO LTD
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