CN108692994A - A kind of injection gas displacement well site aerated zone soil carbon dioxide flux monitoring device and method - Google Patents
A kind of injection gas displacement well site aerated zone soil carbon dioxide flux monitoring device and method Download PDFInfo
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- CN108692994A CN108692994A CN201810370445.7A CN201810370445A CN108692994A CN 108692994 A CN108692994 A CN 108692994A CN 201810370445 A CN201810370445 A CN 201810370445A CN 108692994 A CN108692994 A CN 108692994A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2294—Sampling soil gases or the like
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The present invention provides a kind of injection gas displacement well site aerated zone soil carbon dioxide flux monitoring device and methods, including sequentially connected gas production column, gas parameter monitor, gas production pump, infrared gas analyser, infrared gas analyser is electrically connected with data transmission module, temperature sensor, soil moisture sensor and equilibrated valve are equipped in gas production column, the acquisition of gas production column includes the acquisition of the acquisition and reference air of sample gas.By the way that air reference measurement and equilibrated valve is arranged, realizes continuous background correction and the dynamic air pressure balance of soil gas, soil CO can be eliminated2The barometric disturbance of flux long-time continuous sampling influences;By the real-time measurement of the data such as monitoring site soil gas temperature, soil moisture content, air background temperature, air pressure, monitoring of environmental contextual factor is corrected to CO2The interference of flux accuracy of measurement.Compared with traditional measurement method, monitoring precision is high, and environmental background interference is small, and monitoring change in depth range is big.
Description
Technical field
The invention belongs to environmental monitoring technology fields, and in particular to a kind of injection gas displacement well site aerated zone soil carbon dioxide
Flux monitoring device and method.
Background technology
Carbon dioxide gas drive intensified oil reduction (CO2- EOR) technology all had compared with Gao Rong in You Heshui using carbon dioxide
The characteristics of solution is spent, by the CO of high-purity2Gas is injected into using the relevant technologies in oil reservoir, and C in crude oil is extracted20Lightweight below at
Divide or be vaporized, is conducive to quickly form mixed phase in the earth formation, mixed phase section expands swept volume and drives more stratum
Oil can effectively promote the recovery ratio of crude oil.
But CO2- EOR can be by a large amount of CO2It is sealed in underground, there may be two kinds of leakages for the process:First, burst is let out
Leakage, leakage or the leakage by waste oil well and CO caused by being ruptured such as injection well2Has channeling breaks through oil reservoir etc.;Second is that slowly letting out
Leakage, that is, pass through the leakage of the generations such as tomography, fracture or the oil well of leakage.It is released into the CO of air2It may be to the life on well site periphery
State environment impacts, and may additionally threaten to the personal safety of one line Manufacturing Worker of oil field, therefore monitors well site packet
Gas band soil carbon dioxide release iron, base is provided for the environmental ecology effects and risk assessment of carbon dioxide gas drive oil-producing region block
Plinth data, while can also be to CO2The risk of leakage that the displacement of reservoir oil is sealed up for safekeeping carries out early warning, and strong branch is provided for the safety in production in oil field
Support.
Existing monitoring method is usually using back taper gas gathering mask to having diffused to the CO on ground2Gas carries out
Monitoring, this method has the advantages that technology maturation, device are simple, accuracy of measurement is high, but this method by surface soil environment with
Air background environmental disturbances are larger;For CO in soil2The monitoring of flux is that sampling pipe is squeezed into soil layer, after managing interior soil taking-up
Sampling pipe is aspirated using aspiration pump to obtain gaseous sample, this method can form negative pressure in sampling pipe, cause CO2's
Spills-over effects, and do not consider the dynamic change of soil gas temperature and moisture content to CO2The influence that flux measures, causes to monitor
As a result there is deviation, accuracy of measurement reduces.
Invention content
The purpose of the present invention is overcome the prior art to CO2Flux measures inaccurate technical problem, provides a kind of gas drive
Oil well field aerated zone soil carbon dioxide flux monitoring device and method.
Technical solution provided by the invention is as follows:
A kind of injection gas displacement well site aerated zone soil carbon dioxide flux monitoring device, including sequentially connected gas production column,
Gas parameter monitor, gas production pump, infrared gas analyser, the infrared gas analyser are electrically connected with data transmission module,
The gas production pump is electrically connected with gas production pump movement controller, and gas production pump movement controller is electrically connected with data transmission module;
Be equipped in the gas production column temperature sensor, soil moisture sensor, temperature sensor, soil moisture sensor and
Equilibrated valve, the acquisition of the gas production column include the acquisition of the acquisition and reference air of sample gas, the gas parameter monitor,
Temperature sensor and soil moisture sensor are electrically connected with logging modle, and the logging modle is electrically connected with data transmission module
It connects, the data transmission module is electrically connected with computer.
The gas production column includes depth localization bar, air sampling box, gas gathering mask, equilibrated valve and exhaust-valve, the air sampling box
Upper end connect and seals with depth localization bar, the air sampling box lower ending opening, and the gas gathering mask is set in air sampling box, the gas collection
The straight tube on cover top is connect across depth localization bar with gas parameter monitor;
The temperature sensor, soil moisture sensor and equilibrated valve are set in air sampling box, the pressure balance
Valve is connected to by pipeline with the exhaust-valve on ground, and the exhaust-valve is used for the disengaging of reference air, which passes through pipeline
It is connected to gas parameter monitor.
The gas production column further includes porous plate, and the porous plate is set to below gas gathering mask, is uniformly machined on the porous plate
The circular hole of diameter 4-6mm, percent opening 3-10%, the gas gathering mask are funnel-form.
The depth localization bar is equipped with scale from the bottom to top, and length 1-3m, both ends are equipped with screw thread.
The air sampling box is cylindric, and material is organic glass, a diameter of 50-100mm, thickness 15-20mm, the collection
It is additionally provided with flowmeter on the straight tube on gas hood top.
The present invention also provides a kind of soil carbon dioxide flux monitoring methods, use injection gas displacement well site aerated zone soil
Carbon dioxide flux monitoring device comprising following steps:
Step 1) carries out soil trepanning in monitoring site, is inserted into gas production column 1 after reaching target depth, and connect each portion
Part;
Step 2) opens gas production pump, and keeps sample gas acquisition flow consistent with reference air acquisition flow, passes through infrared gas
Body analyzer monitors CO in sample gas2CO in concentration and reference air2Concentration, and reach data transmission module;
Sample gas and reference air mass flow, air pressure and the temperature sensor detection that step 3) gas parameter monitor monitors
Temperature, soil moisture sensor detection soil moisture content be recorded in logging modle, and imported using data transmission module
Soil CH_4 uptake amount of flux is calculated in computer.
Further include as CO in infrared gas analyser monitoring sample gas2CO in concentration and reference air2Concentration difference is more than setting value
When, data transmission module sends a signal to gas production pump movement controller, and gas production pump movement controller sends instructions to gas production pump and subtracts
Small flow.
Soil CO2Amount of flux calculation formula is as follows
In formula:FCO2For soil CO2Flux, mg/min;K is concentration conversion coefficient, value 1.96, mg/m3;V is sampling
The air sampling box volume of column, m3;A accumulates for sampled cross-section, m2;P is instantaneous air pressure, Pa;P0For standard pressure, Pa;CwContain for soil
Water rate, mmol/mol; TsFor soil gas temperature, DEG C;TrefFor reference air environment temperature, DEG C;csFor CO in sample gas2Concentration,
μmol/mol;crefFor CO in reference air2Concentration, μm ol/mol;T is sampling time, min.
The infrared gas analyser is binary channels infrared gas analyser, and the gas production pump is binary channel peristaltic pump, stream
Amount adjustable range is 0.1-10L/min, and the gas production pump movement controller is integral controller PID.
The beneficial effects of the invention are as follows:
This injection gas displacement well site aerated zone soil carbon dioxide flux monitoring device provided by the invention, it is empty by being arranged
Gas reference measures and sampling column equilibrated valve, realizes continuous background correction and the dynamic air pressure balance of soil gas, can eliminate
Soil CO2The barometric disturbance of flux long-time continuous sampling influences;Monitoring site SOIL GAS is realized by the way that multiple sensors are arranged
The real-time measurement of the data such as temperature, soil moisture content, air background temperature, air pressure, can be according to Simultaneous Determination data correction
Monitoring of environmental contextual factor is to CO2The interference of flux accuracy of measurement.With traditional soil CO2Flux measurement method is compared, this hair
The monitoring precision of bright device is high, and environmental background interference is small, and the frequency of data acquisition is high, and monitoring change in depth range is big.
It is described in further details below in conjunction with attached drawing.
Description of the drawings
Fig. 1 is the structural schematic diagram of the present invention;
Fig. 2 is the structural schematic diagram of gas production column;
Fig. 3 is the schematic diagram of equilibrated valve.
In figure:1, gas production column;1-1, soil moisture sensor;1-2, temperature sensor;1-3, air sampling box;1-4, depth are fixed
Position bar;1-5, exhaust-valve;1-6, gas-tight thread;1-7, gas gathering mask;1-8, porous plate;1-9, equilibrated valve;1-9-1, balance
Valve valve;1-9-2, hinge;2, gas parameter monitor;3, logging modle;4, gas production pumps movement controller;5, gas production pumps;6,
Infrared gas analyser;7, data transmission module;8, computer.
Specific implementation mode
Embodiment 1:
Present embodiments provide a kind of injection gas displacement well site aerated zone soil carbon dioxide flux monitoring dress as shown in Figure 1
It sets, including sequentially connected gas production column 1, gas parameter monitor 2, gas production pump 5, infrared gas analyser 6, the infrared-gas
Analyzer 6 is electrically connected with data transmission module 7, and the gas production pump 5 is electrically connected with gas production pump movement controller 4, and gas production pump is dynamic
Make controller 4 to be electrically connected with data transmission module 7;
Temperature sensor 1-2, soil moisture sensor 1-1 and equilibrated valve 1-9 are equipped in the gas production column 1, it is described
The acquisition of gas production column 1 includes the acquisition of the acquisition and reference air of sample gas, the gas parameter monitor 2, temperature sensor 1-2
It is electrically connected with logging modle 3 with soil moisture sensor 1-1, the logging modle 3 is electrically connected with data transmission module 7, institute
It states data transmission module 7 and is electrically connected with computer 8.
Soil gas is imported CO by the present embodiment by gas production pump 52Concentration sensor (infrared gas analyser 6) is connected
Continuous the real time measure, signal access data analyzer by data transmission module 7 and carry out flux distribution, and aerated zone soil may be implemented
The on-line continuous of gas acquires and flux distribution.Air reference measurement and equilibrated valve 1-9 are set, realize the company of soil gas
Continuous background correction and dynamic air pressure balance, can eliminate soil CO2The barometric disturbance of flux long-time continuous sampling influences;By setting
It sets multiple sensors and realizes the real-time of the data such as monitoring site soil gas temperature, soil moisture content, air background temperature, air pressure
It measures, it can be according to Simultaneous Determination data correction monitoring of environmental contextual factor to CO2The interference of flux accuracy of measurement.
With traditional soil CO2Flux measurement method is compared, and the monitoring precision of apparatus of the present invention is high, environmental background interference
Small, the frequency of data acquisition is high, and monitoring change in depth range is big.
Embodiment 2:
On the basis of embodiment 1, it is logical to present embodiments provide a kind of injection gas displacement well site aerated zone soil carbon dioxide
Monitoring device is measured, the gas production column 1 includes depth localization bar 1-4, air sampling box 1-3, gas gathering mask 1-7, equilibrated valve 1-9, temperature
Spend sensor, soil moisture sensor and exhaust-valve 1-5, the upper ends the air sampling box 1-3 are connect and close with depth localization bar 1-4
Envelope, the air sampling box 1-3 lower ending openings, the gas gathering mask 1-7 are set in air sampling box 1-3, the straight tube on the tops the gas gathering mask 1-7
It is connect with gas parameter monitor 2 across depth localization bar 1-4;
The temperature sensor 1-2, soil moisture sensor 1-1 and equilibrated valve 1-9 are set in air sampling box 1-3,
The equilibrated valve 1-9 is connected to by pipeline with the exhaust-valve 1-5 on ground, and the exhaust-valve 1-5 is for reference air
Disengaging, exhaust-valve 1-5 pass through pipeline connection gas parameter monitor 2.
As shown in Fig. 2, the gas production column 1 further includes porous plate 1-8, the porous plate 1-8 is set to below gas gathering mask 1-7,
The circular hole of diameter 4-6mm is uniformly machined on porous plate 1-8, percent opening 3-10%, the gas gathering mask 1-7 are funnel-form.
The CO of air sampling box 1-3 underlying soils release2By the gas gathering mask 1-7 for entering the centers air sampling box 1-3 after porous plate 1-8 rectifications.
The depth localization bar 1-4 is equipped with scale from the bottom to top, and length 1-3m, both ends are equipped with screw thread.Depth localization
Bar 1-4 is connect with dynamic air sampling box 1-3 using gas-tight thread 1-6, and depth localization bar 1-4 uses stainless steel, and the body of rod is under
It is supreme to be equipped with scale, it can intuitively read the setting depth of dynamic sampling case.The both ends depth localization bar 1-4 are equipped with screw thread, can
Multiple depth localization bar 1-4 are end to end to expand monitoring depth, increase use scope.
The air sampling box 1-3 is cylindric, and material is organic glass, a diameter of 50-100mm, and thickness 15-20mm is described
It is additionally provided with flowmeter on the straight tube on the tops gas gathering mask 1-7.The gas collected by gas gathering mask 1-7 enters gas after flowmeter measures
Body parameter monitor 2.It is drilled using telescopic undisturbed soil sampler and is inserted into dynamic sampling column, 5 are pumped by SOIL GAS by gas production
Body imports infrared gas analyser 6 and carries out continuous the real time measure, and signal accesses computer 8 by data transmission module 7 and led to
The on-line continuous acquisition and flux distribution of aerated zone soil gas may be implemented in amount analysis.
Wherein, as shown in figure 3, equilibrated valve 1-9 includes the balanced valve valve 1-9- for realizing switch by hinge 1-9-2
1.It is more than soil release CO when gas production pumps 5 flows2Speed when, to avoid forming negative pressure in air sampling box 1-3, cause CO2Overflow effect
It answers, at this point, due to interior external pressure imbalance, balanced valve valve 1-9-1 is opened under the effect of the pressure makes reference air enter.
Embodiment 3:
On the basis of 1 injection gas displacement well site aerated zone soil carbon dioxide flux monitoring device of embodiment, the present embodiment
Provide a kind of soil carbon dioxide flux monitoring method comprising following steps:
Step 1) carries out soil trepanning in monitoring site, is inserted into gas production column 1 after reaching target depth, and connect each portion
Part;
Step 2) opens gas production pump 5, and keeps sample gas acquisition flow consistent with reference air acquisition flow, passes through infrared gas
Body analyzer 6 monitors CO in sample gas2CO in concentration and reference air2Concentration, and reach data transmission module 7;
Sample gas and reference air mass flow, air pressure and the temperature sensor 1-2 that step 3) gas parameter monitor 2 monitors
The temperature of detection, the soil moisture content of soil moisture sensor 1-1 detections are recorded in logging modle 3, and utilize data transmission
Module 7 imports computer 8, and soil CH_4 uptake amount of flux is calculated.
Further include when infrared gas analyser 6 monitors CO in sample gas2CO in concentration and reference air2Concentration difference is more than setting
When value, data transmission module 7 sends a signal to gas production pump movement controller 4, and gas production pump movement controller 4 sends instructions to gas production
Pump 5 reduces flow.The situation, because 5 extraction of gas production pump is too fast, causes reference air a large amount of by equilibrated valve 1-9 for avoiding
Into influencing soil CO2Amount of flux.Wherein, setting value can discharge CO according to soil2Amount and reference air in CO2Amount it
The predicted value of difference is set.
Soil CO2Amount of flux calculating can be calculated by computer software, can also be calculated by following formula:
In formula:FCO2For soil CO2Flux, mg/min;K is concentration conversion coefficient, value 1.96, mg/m3;V is sampling
The air sampling box 1-3 volumes of column, m3;A accumulates for sampled cross-section, m2;P is instantaneous air pressure, Pa;P0For standard pressure, Pa;CwFor soil
Moisture content, mmol/mol; TsFor soil gas temperature, DEG C;TrefFor reference air environment temperature, DEG C;csFor CO in sample gas2It is dense
Degree, μm ol/mol;crefFor CO in reference air2Concentration, μm ol/mol;T is sampling time, min.
The infrared gas analyser 6 is binary channels infrared gas analyser, and the gas production pump 5 is binary channel peristaltic pump,
Flow adjustment range is 0.1-10L/min, and the gas production pump movement controller 4 is integral controller PID.Due to adopt simultaneously
Monitor set sample gas and reference air, therefore binary channels infrared gas analyser or the identical infrared-gas point of bench-types No. two need to be used
Analyzer 6 monitors simultaneously.
Gas parameter monitor 2 is existing equipment, can obtain gas flow rate, gas flow, gas dynamic pressure, static pressure etc. online
Parameter.It can buy on the market, the DL-6600SG type gas parameters prison produced such as Qingdao power great achievement environmental protection equipment Co., Ltd
Survey instrument.
The foregoing examples are only illustrative of the present invention, does not constitute the limitation to protection scope of the present invention, all
Be with the present invention it is same or analogous design all belong to the scope of protection of the present invention within.The portion that the present embodiment does not describe in detail
The well-known components and common structure or conventional means of part and the structure category industry, do not describe one by one here.
Claims (9)
1. a kind of injection gas displacement well site aerated zone soil carbon dioxide flux monitoring device, it is characterised in that:Including being sequentially connected
Gas production column (1), gas parameter monitor (2), gas production pump (5), infrared gas analyser (6), the infrared gas analyser
(6) it is electrically connected with data transmission module (7), the gas production pump (5) is electrically connected with gas production pump movement controller (4), gas production pump
Movement controller (4) is electrically connected with data transmission module (7);
Temperature sensor (1-2), soil moisture sensor (1-1) and equilibrated valve (1-9) are equipped in the gas production column (1),
The acquisition of the gas production column (1) includes the acquisition of the acquisition and reference air of sample gas, the gas parameter monitor (2), temperature
Sensor (1-2) and soil moisture sensor (1-1) are electrically connected with logging modle (3), and the logging modle (3) passes with data
Defeated module (7) electrical connection, the data transmission module (7) are electrically connected with computer (8).
2. a kind of injection gas displacement well site aerated zone soil carbon dioxide flux monitoring device according to claim 1, special
Sign is:The gas production column (1) includes depth localization bar (1-4), air sampling box (1-3), gas gathering mask (1-7), equilibrated valve (1-
9), temperature sensor (1-2), soil moisture sensor (1-1) and exhaust-valve (1-5), the air sampling box upper end (1-3) and depth
Locating rod (1-4) is connected and is sealed, air sampling box (1-3) lower ending opening, and the gas gathering mask (1-7) is set to air sampling box (1-3)
Interior, the straight tube on gas gathering mask (1-7) top is connect across depth localization bar (1-4) with gas parameter monitor (2);
The temperature sensor (1-2), soil moisture sensor (1-1) and equilibrated valve (1-9) are set to air sampling box (1-3)
Interior, the equilibrated valve (1-9) is connected to by pipeline with the exhaust-valve (1-5) on ground, and the exhaust-valve (1-5) is for joining
Than the disengaging of air, which passes through pipeline connection gas parameter monitor (2).
3. a kind of injection gas displacement well site aerated zone soil carbon dioxide flux monitoring device according to claim 2, special
Sign is:The gas production column (1) further includes porous plate (1-8), and the porous plate (1-8) is set to below gas gathering mask (1-7), this is more
The circular hole of diameter 4-6mm, percent opening 3-10% are uniformly machined on orifice plate (1-8), the gas gathering mask (1-7) is funnel-form.
4. a kind of injection gas displacement well site aerated zone soil carbon dioxide flux monitoring device according to claim 2, special
Sign is:The depth localization bar (1-4) is equipped with scale from the bottom to top, and length 1-3m, both ends are equipped with screw thread.
5. a kind of injection gas displacement well site aerated zone soil carbon dioxide flux monitoring device according to claim 2, special
Sign is:The air sampling box (1-3) is cylindric, and material is organic glass, a diameter of 50-100mm, and thickness 15-20mm is described
It is additionally provided with flowmeter on the straight tube on the top gas gathering mask (1-7).
6. a kind of soil carbon dioxide flux monitoring method uses injection gas displacement well site aerated zone soil described in claim 1
Carbon dioxide flux monitoring device, which is characterized in that include the following steps:
Step 1) carries out soil trepanning in monitoring site, is inserted into gas production column (1) after reaching target depth, and connect each portion
Part;
Step 2) opens gas production pump (5), and keeps sample gas acquisition flow consistent with reference air acquisition flow, passes through infrared-gas
Analyzer (6) monitors CO in sample gas2Concentration csWith CO in reference air2Concentration cref, and reach data transmission module (7);
Sample gas and reference air mass flow, air pressure and the temperature sensor (1-2) that step 3) gas parameter monitor (2) monitors
The temperature of detection, the soil moisture content of soil moisture sensor (1-1) detection are recorded in logging modle (3), and utilize data
Transmission module (7) imports computer (8), and soil CO is calculated2Amount of flux.
7. a kind of soil carbon dioxide flux monitoring method according to claim 6, it is characterised in that:Further include when infrared
Gas analyzer (6) monitors CO in sample gas2CO in concentration and reference air2When concentration difference is more than setting value, data transmission module
(7) gas production pump movement controller 4 is sent a signal to, gas production pump movement controller (4) sends instructions to gas production pump (5) and reduces stream
Amount.
8. a kind of soil carbon dioxide flux monitoring method according to claim 6, it is characterised in that:Soil CO2Amount of flux
Calculation formula is as follows
In formula:FCO2For soil CO2Flux, mg/min;K is concentration conversion coefficient, value 1.96, mg/m3;V is sampling column
Air sampling box volume, m3;A accumulates for sampled cross-section, m2;P is instantaneous air pressure, Pa;P0For standard pressure, Pa;CwFor soil moisture content,
mmol/mol;TsFor soil gas temperature, DEG C;TrefFor reference air environment temperature, DEG C;csFor CO in sample gas2Concentration, μm ol/
mol;crefFor CO in reference air2Concentration, μm ol/mol;T is sampling time, min.
9. a kind of soil carbon dioxide flux monitoring method according to claim 6, it is characterised in that:The infrared-gas
Analyzer (6) is binary channels infrared gas analyser, and the gas production pump (5) is binary channel peristaltic pump, and flow adjustment range is
0.1-10L/min, the gas production pump movement controller (4) are integral controller PID.
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| CN109632686A (en) * | 2019-01-24 | 2019-04-16 | 山东省地质调查院（山东省国土资源厅矿产勘查技术指导中心） | Closed layered soil carbon dioxide flux measuring device and method |
| CN109856338A (en) * | 2019-03-06 | 2019-06-07 | 华东师范大学 | A kind of measuring device and method of soil gaseous state nitrous acid emission flux |
| CN110231459A (en) * | 2019-07-16 | 2019-09-13 | 中国科学院遗传与发育生物学研究所农业资源研究中心 | A kind of detection device of soil discharge gas isotope |
| CN110702473A (en) * | 2019-09-20 | 2020-01-17 | 中国石油天然气股份有限公司 | Method and device for synchronously monitoring carbon dioxide flux of aeration zone soil at multiple points |
| CN110761751A (en) * | 2019-09-20 | 2020-02-07 | 中国石油天然气股份有限公司 | Aeration zone soil multi-point gas collection device with background comparison function |
| CN112557629A (en) * | 2020-12-14 | 2021-03-26 | 中铁第一勘察设计院集团有限公司 | Soil gas flux measuring method |
| CN116990089A (en) * | 2023-07-31 | 2023-11-03 | 珠海深圳清华大学研究院创新中心 | Monitoring device and method for directly discharging sewage greenhouse gases |
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