CN102967416A - Method for monitoring methane leakage of shallow sea oil gas mining region - Google Patents
Method for monitoring methane leakage of shallow sea oil gas mining region Download PDFInfo
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- CN102967416A CN102967416A CN2012104508381A CN201210450838A CN102967416A CN 102967416 A CN102967416 A CN 102967416A CN 2012104508381 A CN2012104508381 A CN 2012104508381A CN 201210450838 A CN201210450838 A CN 201210450838A CN 102967416 A CN102967416 A CN 102967416A
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Abstract
A method for monitoring methane leakage of a shallow sea oil gas mining region comprises the following steps of utilizing a shipborne water pump to continuously pump sea water from the 1-5m depth of position under the sea surface when a ship travels, conveying the sea water to a water-air balancer in a shipborne laboratory; using a spray nozzle on the water-air balancer to crush a water sample to be small water drops, enabling the water drops and air in the water-air balancer to be balanced, utilizing an air pump to pump balanced air out, leading the air dehydrated by a dehydration device into a methane automatic analyzer to perform methane partial pressure analysis and leading analyzed tail air back to the water-air balancer to be re-balanced; and displaying a methane partial pressure analysis result on a displayer through a data acquiring unit with frequencies per minutes as a group in a data mode and in a figure mode. The method can continuously monitor methane partial pressure of a water body with certain depth of an ocean water area in real time in a high resolution mode.
Description
Technical field
The present invention relates to a kind of monitoring method, particularly a kind of method for monitoring oil-gas mining district, shallow sea methane leakage.
Background technology
Offshore oil exploration and recovery activity cause sea-bottom oil-gas Tibetan leakage accident to take place frequently.For example, on April 20th, 2010, " deep water local horizon " offshore drilling platforms of British Petroleum Company p.l.c.'s lease is blasted in waters, the U.S. Gulfian and is sunk, and causes leakage of oil event the most serious on the American history; 19-3 oil field, Peng Lai, the Bohai Sea in summer in 2011 oil spill accident then starts great disturbance in China.It is reported that Tenth Five-Year Plan Period at Bohai Offshore 16 of major oil spill accidents occurs altogether.These heavy, especially big industrial accidents are owing to marine environment being caused severe contamination cause showing great attention to of the public and government department.Hide definite place and the coverage thereof of leaking although relevant department wishes to grasp accurately, timely sea-bottom oil-gas with tissue, main technical bottleneck is exactly that shortage is on-the-spot fast, high time-space resolution detects the effective ways that the coastal waters sea-bottom oil-gas is hidden the leakage situation.Hide incident of leakage/accident for some small sea-bottom oil-gas, naked eyes or optics Oil spill detection instrument are renderd a service not enough, are difficult to instruct targetedly sampling.Therefore can only layout in a large number according to classic method, blindly gather water sample, and take back lab analysis petroleum hydrocarbon wherein.This method labour intensity is large, and inefficiency even find the signal that some are relevant in later stage work, also can't be got back to the sampling waters and prove conclusively.The monitoring of revealing to hydrocarbon-bearing pool has brought certain difficulty.Therefore the method that needs now a kind of monitoring hydrocarbon-bearing pool that can address the above problem to reveal.
Summary of the invention
The present invention is in order to solve the existing above-mentioned deficiency of prior art, propose a kind of can be in real time, the method for oil-gas mining district, fast monitored shallow sea methane leakage.
Technical solution of the present invention is: a kind of method of monitoring oil-gas mining district, shallow sea methane leakage, and it is characterized in that: described monitoring method may further comprise the steps:
A, under the state of ship running, utilize the boat-carrying water pump from the sea following 1-5m depth of water continuous drawing seawater, and seawater is transported among water in the boat-carrying laboratory-gas evener,
Shower nozzle on b, the water-gas evener is broken into fine liquid particles with water sample, allow the interior air of water droplet and water-gas evener reach balance, the even sucking-off of air after utilizing air pump with balance, removing air behind the moisture through dehydration plant enters the methane automatic analyzer and carries out the analysis of methane dividing potential drop, tail gas after analysis is finished carries out again balance among coming back to water-gas evener
The result of c, the analysis of methane dividing potential drop is presented on the display by data acquisition unit with the frequency of one group of per minute, and analysis result shows with data and chart dual mode respectively.
Described methane automatic analyzer is the optical cavity ring-down spectrum analysis instrument.
Described dehydration plant is surge flask or condenser pipe.
The present invention compares with prior art, has following advantage:
The invention discloses a kind of method that can detect in real time the water layer of the following certain depth in sea, a kind of method of monitoring oil-gas mining district, shallow sea methane leakage specifically, this method is simple, can realize the real-time detection to seawater methane dividing potential drop, and drawing out the methane dividing potential drop chart of nearest a period of time according to this measurement result, operating personnel can judge whether this marine site hydrocarbon-bearing pool occurs and reveal according to unusual rising of the methane dividing potential drop shown in the chart.The method that this method of unusually judging the hydrocarbon-bearing pool leak case of utilizing the methane dividing potential drop is revealed than traditional judgement hydrocarbon-bearing pool, have ageing strong, convenient and swift, accuracy rate is high, is convenient to determine the multiple advantages such as leak position.Therefore the market outlook of this detection method and scientific research, social effect are all very great, are conducive to apply in the art.
Description of drawings
Fig. 1 is the schematic flow sheet of the embodiment of the invention.
Embodiment
Below in conjunction with description of drawings the specific embodiment of the present invention.As shown in Figure 1:
A kind of method of monitoring oil-gas mining district, shallow sea methane leakage, this detection method may further comprise the steps:
At first under the state of ship running, utilize the boat-carrying water pump from the following 1-5m depth of water of water surface continuous drawing seawater, it should be noted that, because the required detection of this method is methane dividing potential drop in the seawater, and in seawater, generally there is the methanobacteria of having a liking for, the time that methane gas stops in seawater is longer, and its dividing potential drop is lower, so the process of this extracting seawater water sample should use the highly dense water pipe of suitable length to carry out; Water sample is transported among the water in boat-carrying laboratory-gas evener by water pipe, the shower nozzle of water-gas evener is broken into tiny drops with water sample, and allow these fine liquid particles in water-gas evener, reach balance with wherein air, then the uniform sucking-off of air after utilizing air pump with balance, this part gas dewaters by dehydration plant, and described dehydration plant can be surge flask or condenser pipe; The gas that removes behind the moisture enters the methane automatic analyzer, and namely the optical cavity ring-down spectrum analysis instrument carries out the analysis of methane dividing potential drop, analyzes tail gas after finishing and carries out again balance among coming back to water-gas evener; The analysis result of methane dividing potential drop is by behind the data acquisition unit, is presented on the display with the frequency of one group of per minute, and shows that with data and chart dual mode more directly perceived, handled easily personnel judge respectively; Also the real-time latitude and longitude information of boat-carrying GPS positioning system is received in the lump simultaneously, be stored in the storer.The Monitoring Data of methane dividing potential drop is mutually corresponding with the latitude and longitude information of ship's navigation, conveniently checks.
Generally speaking, the dissolved methane in the seawater and atmosphere are near balance.Yet, because methane is the important composition composition that sea-bottom oil-gas is hidden, leaking if therefore the sea-bottom oil-gas Tibetan occurs, the dissolved methane in local marine site will raise unusually, forms methane " focus ".The unusual rising of dissolved methane can be used as the index that the indication sea-bottom oil-gas is hidden leakage in the seawater thus.In the deep water waters, have a liking for methanobacteria owing to contain in the seawater, so the formed methane signal of oil spilling can only be detected in the water layer below 1000 meters.And the Offshore Oil gas reservoir developing zone of China is usually relatively shallow, reveal if there is hydrocarbon-bearing pool, the methane that hydrocarbon-bearing pool discharges can rise to the sea table rapidly, therefore can judge whether the seabed situation that hydrocarbon-bearing pool is revealed occurs by the methane dividing potential drop that detects in the seawater.
This kind of method can be monitored the methane dividing potential drop of 1-5m depths, underwater in real time, and can draw out (such as 6 hours) sea table methane dividing potential drop data in the past period according to resulting monitoring result, thereby demonstrate intuitively boats and ships through the methane dividing potential drop in the marine site situation that unusually raises, for whether site assessment marine site of living in sea-bottom oil-gas occurs hide to reveal foundation be provided.The environmental monitoring work personnel also can be with methane dividing potential drop data as guidance, gather in the unusual marine site that raises of methane dividing potential drop targetedly with sea-bottom oil-gas and hide leakage relevant sea table water sample, full water column water sample, perhaps the sample such as sediment is taken back the laboratory and is further analyzed.
According to the methane dividing potential drop data that real-time monitor, draw out over 6 hours inland seas table methane dividing potential drop tables of data, when chart shows, with interior voyage sea table methane dividing potential drop spike appears at 1 nautical mile, when its peak value surpasses 3 times of this sea, marine site table methane background valuess, exist sea-bottom oil-gas to hide leakage phenomenon near can judging the course line; Then transfer corresponding latitude and longitude information, can judge accurately the position that hydrocarbon-bearing pool is revealed.
Utilize method of the present invention, can indicate intuitively through the methane dividing potential drop in the marine site phenomenon that unusually raises, for whether the site assessment locality sea-bottom oil-gas occurs hide to leak foundation be provided.Also can be with the methane data of Real-Time Monitoring as guidance, gather the samples such as sea table water sample or relevant full water column water sample, sediment in the methane dividing potential drop marine site that unusually raises targetedly, take back the laboratory and do umpire analysis.
To be marine environment supervision department carry out the hydrocarbon-bearing pool leakage monitoring and evaluation work is laid a good foundation at shallow sea areas such as the Bohai Sea to scheme described in the invention, also can be used for associated production enterprise to the monitoring analysis of off-shore oil rig work zone supervision property, also can be used as simultaneously a kind of technological means that submarine oil resources is surveyed.
Claims (3)
1. method of monitoring oil-gas mining district, shallow sea methane leakage, it is characterized in that: described monitoring method may further comprise the steps:
A, under the state of ship running, utilize the boat-carrying water pump from the sea following 1-5m depth of water continuous drawing seawater, and seawater is transported among water in the boat-carrying laboratory-gas evener,
Shower nozzle on b, the water-gas evener is broken into fine liquid particles with water sample, allow the interior air of water droplet and water-gas evener reach balance, the even sucking-off of air after utilizing air pump with balance, removing air behind the moisture through dehydration plant enters the methane automatic analyzer and carries out the analysis of methane dividing potential drop, tail gas after analysis is finished carries out again balance among coming back to water-gas evener
The result of c, the analysis of methane dividing potential drop is presented on the display by data acquisition unit with the frequency of one group of per minute, and analysis result shows with data and chart dual mode respectively.
2. the method for oil-gas mining district, monitoring shallow sea according to claim 1 methane leakage, it is characterized in that: described methane automatic analyzer is the optical cavity ring-down spectrum analysis instrument.
3. the method for oil-gas mining district, monitoring shallow sea according to claim 1 methane leakage, it is characterized in that: described dehydration plant is surge flask or condenser pipe.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115031904A (en) * | 2022-08-10 | 2022-09-09 | 山东省地质矿产勘查开发局八〇一水文地质工程地质大队(山东省地矿工程勘察院) | Processing method and processing system for marine geological parameters |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115031904A (en) * | 2022-08-10 | 2022-09-09 | 山东省地质矿产勘查开发局八〇一水文地质工程地质大队(山东省地矿工程勘察院) | Processing method and processing system for marine geological parameters |
| CN115031904B (en) * | 2022-08-10 | 2022-12-20 | 山东省地质矿产勘查开发局八〇一水文地质工程地质大队(山东省地矿工程勘察院) | Processing method and processing system for marine geological parameters |
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Application publication date: 20130313 |