CN113062723A - Method and device for detecting oxygen content of geothermal well - Google Patents
Method and device for detecting oxygen content of geothermal well Download PDFInfo
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- CN113062723A CN113062723A CN202110368229.0A CN202110368229A CN113062723A CN 113062723 A CN113062723 A CN 113062723A CN 202110368229 A CN202110368229 A CN 202110368229A CN 113062723 A CN113062723 A CN 113062723A
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 107
- 239000001301 oxygen Substances 0.000 title claims abstract description 107
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 107
- 238000000034 method Methods 0.000 title claims description 26
- 239000007789 gas Substances 0.000 claims abstract description 123
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 78
- 238000001514 detection method Methods 0.000 claims abstract description 75
- 239000012530 fluid Substances 0.000 claims abstract description 58
- 230000005494 condensation Effects 0.000 claims abstract description 7
- 238000009833 condensation Methods 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims description 203
- 239000007788 liquid Substances 0.000 claims description 153
- 238000004140 cleaning Methods 0.000 claims description 10
- 239000000110 cooling liquid Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 4
- 230000027734 detection of oxygen Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 description 13
- 230000007797 corrosion Effects 0.000 description 12
- 230000008569 process Effects 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000004082 amperometric method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007859 condensation product Substances 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/087—Well testing, e.g. testing for reservoir productivity or formation parameters
- E21B49/088—Well testing, e.g. testing for reservoir productivity or formation parameters combined with sampling
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Abstract
The invention belongs to the technical field of detection of oxygen content of geothermal wells, and discloses a detection method and a detection device for the oxygen content of a geothermal well, wherein the detection method comprises the steps of collecting high-temperature fluid of the geothermal well; condensing the high-temperature fluid, and respectively collecting condensed water and condensed gas after condensation; and detecting the oxygen contents in the condensed water and the condensed gas respectively, and adding the oxygen contents to the condensed water and the condensed gas to obtain the total oxygen content. According to the invention, the high-temperature fluid is condensed to form the condensed water and the condensed gas, and the total oxygen content of the high-temperature fluid is obtained by respectively detecting the oxygen content, so that the real-time rapid detection of the oxygen content of the high-temperature fluid can be realized, a sample does not need to be extracted, the detection result is accurate, and the detection precision is high.
Description
Technical Field
The invention relates to the technical field of detection of oxygen content of geothermal wells, in particular to a detection method and a detection device for the oxygen content of the geothermal wells.
Background
The produced fluid contains a certain amount of CO in the process of extracting geothermal well and oil-gas well resources2、H2S and O2And the like, so that the drilling tool, the shaft, the wellhead device and the pipeline face serious corrosion failure risks, and the corrosion failure risks are further aggravated along with the increase of the temperatures of the shaft bottom and the wellhead. In the presence of CO2、O2And a trace amount of H2S can generate a plurality of corrosion reactions, but the corrosion rate in an oxygen-containing environment is higher than that of H2S and CO2The corrosion is severe, so the detection of the enhanced oxygen has important significance for preventing the corrosion of the pipe.
The existing oxygen content detection methods comprise an iodometry method, a amperometry method and a fluorescence quenching method, but the above oxygen content detection methods are not suitable for high-temperature geothermal fluid or steam, have the problems of poor high-temperature detection precision and detection delay, and cannot realize online real-time monitoring.
Disclosure of Invention
The invention aims to provide a method and a device for detecting the oxygen content of a geothermal well, which are used for solving the problems of real-time online detection of the oxygen content of the geothermal well and poor detection precision.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention firstly provides a method for detecting the oxygen content of a geothermal well, which comprises the following steps:
s1, collecting high-temperature fluid of the geothermal well;
s2, condensing the high-temperature fluid, and respectively collecting condensed water and condensed gas after condensation;
and S3, detecting the oxygen contents in the condensed water and the condensed gas respectively, and adding the two to obtain the total oxygen content.
Optionally, in step S2, the step of condensing the high-temperature fluid includes:
the high-temperature fluid firstly enters a condenser; the outlet of the condenser is connected with a first port of a tee joint, a second port of the tee joint is connected with a liquid testing box downwards to collect the condensed water, and a third port of the tee joint is connected with a gas testing box upwards to collect the condensed gas.
Optionally, before the step S2 of condensing the high-temperature fluid, a step of cleaning a pipeline is further included, specifically:
s21, closing the cooling liquid input channel by the condenser, and enabling the liquid testing box and the gas testing box to be in an open state and to be communicated with the outside; the high temperature fluid is able to enter the condenser, the liquid test tank and the gas test tank to clean the condenser, the liquid test tank and the gas test tank;
s22, opening the cooling liquid input channel to the condenser, closing a second stop valve at the bottom of the liquid test box, and collecting condensed water until the liquid level is higher than the top of the gas test box;
s23, opening a second stop valve at the bottom of the liquid test box, and discharging water until the liquid level reaches the bottom of the liquid test box;
s24, repeating the steps S22-S23 at least twice.
Optionally, the liquid testing box at least includes a first liquid testing box and a second liquid testing box, the first liquid testing box is at a high position relative to the second liquid testing box, the second port of the tee joint is connected to the first liquid testing box, a first stop valve is arranged between the first liquid testing box and the second liquid testing box, before oxygen content detection is performed, the first stop valve is in an open state, the second liquid testing box collects the condensate water, then the first stop valve is closed, the first liquid testing box collects the condensate water, and the condensate water collected in the first liquid testing box is subjected to oxygen content detection.
The invention also provides a geothermal well oxygen content detection device, which is used for realizing the geothermal well oxygen content detection method and comprises the following steps:
one end of the steam pipeline is connected with the wellhead main valve to collect high-temperature fluid, and the other end of the steam pipeline is connected with the condenser to condense the high-temperature fluid;
and a first port of the tee joint is connected with the output end of the condenser, a second port of the tee joint is connected with the liquid test box downwards to collect condensed water, a third port of the tee joint is connected with the gas test box upwards to collect condensed gas, the condensed water is subjected to oxygen content detection and the condensed gas is subjected to oxygen content detection respectively, and the total oxygen content is obtained by adding the condensed water and the condensed gas.
Optionally, the liquid testing box at least comprises a first liquid testing box and a second liquid testing box, the first liquid testing box is at a high position relative to the second liquid testing box and is connected with the second port of the tee joint, and a first stop valve is arranged between the first liquid testing box and the second liquid testing box; and a second stop valve is arranged at the bottom of the second liquid testing box.
Optionally, the gas test box is provided with at least two, at least two the gas test box concatenates in proper order in vertical direction, the gas test box is in the high position relative to the liquid test box.
Optionally, a check valve is arranged between two adjacent gas test boxes.
Optionally, the geothermal well oxygen content detection device further comprises a liquid level meter, and the liquid level meter is respectively arranged in the liquid test box and the gas test box.
Optionally, a high-pressure hand valve, a high-pressure needle valve, a flow valve and a pressure gauge are sequentially arranged on the steam pipeline from the wellhead main valve to the condenser.
The invention has the beneficial effects that:
according to the method for detecting the oxygen content of the geothermal well, the high-temperature fluid is condensed to form the condensed water and the condensed gas, the oxygen content of the condensed water and the condensed gas is detected respectively, the total oxygen content of the high-temperature fluid is obtained, real-time and rapid online detection of the oxygen content of the high-temperature fluid can be realized, a sample does not need to be extracted, the test result is accurate, and the precision is high.
According to the geothermal well oxygen content detection device, the condenser and the tee joint are arranged on the steam pipeline outside the wellhead main valve, condensed water and condensed gas are respectively collected and subjected to oxygen content detection, the total oxygen content is obtained by adding the oxygen contents of the condensed water and the condensed gas, real-time and rapid oxygen content detection of high-temperature fluid is achieved, the test result is accurate, and the detection precision is high. The geothermal well oxygen content detection device is applied to a high-temperature geothermal well, and provides accurate data information for judging the corrosion condition of a pipeline and adopting a corresponding anti-corrosion process.
Drawings
FIG. 1 is a flow chart of a method for detecting oxygen content in a geothermal well according to the invention;
FIG. 2 is a schematic structural diagram of a geothermal well oxygen content detection device of the present invention.
In the figure:
1. a condenser; 11. a high pressure hand valve; 12. a high pressure needle valve; 13. a flow valve; 14. a pressure gauge; 2. a tee joint; 3. a liquid test chamber; 31. a first liquid test chamber; 32. a second liquid test chamber; 4. a gas test chamber; 5. a first shut-off valve; 6. a second stop valve; 7. a one-way valve; 8. a third stop valve; 9. a liquid level meter.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The method and the device for detecting the oxygen content of the geothermal well provided by the invention are respectively explained in detail with reference to fig. 1-2.
With reference to fig. 1, the present invention firstly provides a method for detecting oxygen content in a geothermal well, which comprises the following steps:
s1, collecting high-temperature fluid of the geothermal well;
s2, condensing the high-temperature fluid, and respectively collecting condensed water and condensed gas after condensation;
and S3, detecting the oxygen contents in the condensed water and the condensed gas respectively, and adding the two to obtain the total oxygen content.
According to the method for detecting the oxygen content of the geothermal well, the high-temperature fluid is condensed to form the condensed water and the condensed gas, the oxygen content of the condensed water and the condensed gas is detected respectively, the total oxygen content of the high-temperature fluid is obtained, the real-time rapid detection of the oxygen content of the high-temperature fluid can be realized, the test result is accurate, and the precision is high.
In the detection method, the high-temperature fluid or the high-temperature fluid can be directly collected from the geothermal wellhead and tested without sampling in advance, so that the aim of detecting the oxygen content of the geothermal high-temperature fluid (usually high-temperature steam) in real time is fulfilled. The invention can condense high-temperature and high-pressure water vapor into liquid water and low-temperature gas, realizes the detection of the low-temperature oxygen content of high-temperature fluid or vapor, can make up the defect that the existing tool is not suitable for high-temperature conditions, and has high detection precision.
Referring to fig. 2, in step S2 of the detection method, the high-temperature fluid is condensed, and the method is implemented by the following steps:
high-temperature fluid firstly enters a condenser 1; the outlet of the condenser 1 is connected with the first port of the tee joint 2, the second port of the tee joint 2 is connected with the liquid testing box 3 downwards to collect condensed water, and the third port is connected with the gas testing box 4 upwards to collect condensed gas.
Through condenser 1 and tee bend 2, realize collecting condensate water and condensate gas's alone, be convenient for detect alone to improve and detect the precision, liquid and gas after the condensation can adopt conventional detecting instrument to carry out the oxygen content and detect, form liquid and gaseous two-phase after the high temperature fluid condensation, and two-phase oxygen content adds, obtains total oxygen content promptly.
Further, before the step S2 of condensing the high-temperature fluid, the method further includes a step of cleaning the pipeline, specifically:
s21, the condenser 1 closes the cooling liquid input channel, and the liquid test box 3 and the gas test box 4 are both in an open state and are both communicated with the outside; high temperature fluid can enter the condenser 1, the liquid test box 3 and the gas test box 4 to clean the condenser 1, the liquid test box 3 and the gas test box 4;
s22, the condenser 1 opens the cooling liquid input channel, the second stop valve 6 at the bottom of the liquid test box 3 is closed, and the liquid test box 3 collects the condensed water until the liquid level is higher than the top of the gas test box 4;
s23, opening a second stop valve 6 at the bottom of the liquid testing box 3, and discharging water until the liquid level reaches the bottom of the liquid testing box 3;
s24, repeating the steps S22-S23 at least twice.
It can be understood that, after the condenser 1 closes the cooling liquid input channel, the high-temperature fluid only passes through the condenser 1 without condensation, the high-temperature fluid continuously passes through the liquid testing box 3 and the gas testing box 4 and is discharged, and after the high-temperature fluid is ventilated for a period of time, the cleaning effect on the liquid testing box 3 and the gas testing box 4 can be realized, so that the detection precision of the oxygen content is improved. Before collecting the condensed water and the condensed gas, the high-temperature fluid is continuously cooled to obtain the condensed water and the condensed gas, the condensed water is collected to the full gas test box 4 and then drained, the process is continued for 2-3 times, the air in the gas test box 4 and the pipeline can be discharged, and the detection precision of the oxygen content is improved.
Optionally, the liquid testing box 3 at least includes a first liquid testing box 31 and a second liquid testing box 32, the first liquid testing box 31 is at a high position relative to the second liquid testing box 32, the second port of the tee joint 2 is connected to the first liquid testing box 31, a first stop valve 5 is disposed between the first liquid testing box 31 and the second liquid testing box 32, before the oxygen content detection is performed, the first stop valve 5 is in an open state, the second liquid testing box 32 collects the condensed water, then the first stop valve 5 is closed, the first liquid testing box 31 collects the condensed water, and the oxygen content detection is performed on the condensed water collected in the first liquid testing box 31.
It should be explained that, in the detection method of the present invention, at least two liquid detection boxes 3 are adopted, both of which can collect condensed water, but only the oxygen content of the condensed water in one of the liquid detection boxes 3 is detected, it can be understood that, after a certain amount of condensed water is collected in the second liquid detection box 32, the first liquid detection box 31 and the pipeline are filled with condensed gas, at this time, the first stop valve 5 is closed, and the condensed water is collected in the first liquid detection box 31 and the oxygen content is detected, and the condensed water and the condensed gas to be detected are located in the middle section of the whole pipeline, so that the influence of the external air on the detection of the oxygen content is effectively avoided, and the detection accuracy is improved.
The invention also provides a geothermal well oxygen content detection device for realizing the geothermal well oxygen content detection method, as shown in fig. 2, the geothermal well oxygen content detection device comprises a condenser 1 and a tee joint 2, wherein the input end of the condenser 1 is connected with a wellhead through a steam pipeline to collect high-temperature fluid and condense the high-temperature fluid. The first port of tee bend 2 connects the output of condenser 1, and the second port downwardly connected liquid test box 3 is in order to gather the comdenstion water, and the third port upwardly connected gas test box 4 is in order to gather the comdenstion gas, carries out the oxygen content to the comdenstion water respectively and detects with carrying out the oxygen content to the comdenstion gas, and the sum of the two is total oxygen content promptly.
As shown in fig. 2, the second port and the third port of the tee joint 2 are coaxially arranged and are in a vertical direction, the liquid testing box 3 and the gas testing box 4 are coaxially arranged in the vertical direction, so that downward flow of liquid water and upward diffusion of gas are facilitated, condensed water and condensed gas are output after high-temperature fluid is condensed by the condenser 1, condensed water flows downwards into the liquid testing box 3 due to the action of gravity, the condensed gas passes upwards through the gas testing box 4 to respectively detect the oxygen content in the condensed water and the oxygen content in the condensed gas, and the sum of the two oxygen content results is the total oxygen content in the high-temperature fluid.
Optionally, the liquid testing box 3 at least comprises a first liquid testing box 31 and a second liquid testing box 32, the first liquid testing box 31 is at a high position relative to the second liquid testing box 32, the first liquid testing box 31 is connected with the second port of the tee joint 2, and a first stop valve 5 is arranged between the first liquid testing box 31 and the second liquid testing box 31; the bottom of the second liquid test tank 32 is provided with a second shut-off valve 6.
As shown in fig. 2, the pipeline between the first liquid testing box 31 and the second liquid testing box 32 is coaxially arranged with the second port and the third port of the tee joint 2, the condensed water flowing out from the second port of the tee joint 2 flows downwards and is collected in the second liquid testing box 32, the second liquid testing box 32 is collected in the first liquid testing box 31 after being collected in a full box, and the condensed water sequentially flows upwards and can reach the gas testing box 4 or be discharged upwards. By utilizing the principle, in the detection device, the condensed water is collected from bottom to top in sequence until the gas test box 4 is full, so that the aim of discharging the air is fulfilled, the influence of the air on the oxygen content test is reduced, the operation is repeated for several times, the air is completely discharged, the aims of cleaning the pipeline, the liquid test box 3 and the gas test box 4 are fulfilled, the second stop valve 6 is closed after cleaning, the first stop valve 5 is closed after the second liquid test box 32 collects the condensed water to a certain height, the first liquid test box 31 collects the condensed water to a certain height, the oxygen content in the condensed water is detected, meanwhile, the oxygen content of the condensed gas passing through the gas test box 4 is detected, and the total oxygen content is obtained by adding the two. Through the mode of washing and secondary collection comdenstion water, the influence of air to the oxygen content test that can minimize improves oxygen content and detects the precision.
Optionally, the number of the gas test boxes 4 is at least two, the at least two gas test boxes 4 are sequentially connected in series in the vertical direction, and the gas test boxes 4 are at a high position relative to the liquid test box 3.
In the embodiment shown in fig. 2, two gas test chambers 4 are sequentially upward, and it is understood that the gas test chambers 4 may be formed by providing valves on pipes, and the volume of the gas test chambers 4 is not limited, but preferably, the pipes on the gas test chambers 2 are provided coaxially with the second port of the tee 2, so as to facilitate smooth discharge of the condensed gas or the high-temperature fluid. When cleaning, high temperature fluid can be full of whole pipeline and each liquid test box 3 and gaseous test box 4, realizes the discharge to the air, improves the measuring accuracy of oxygen content in condensate water and the condensate gas. Two gas test boxes 4 or more than two gas test boxes 4 are arranged, and the upper end and the lower end of the condensed gas to be tested are condensation products, so that the influence of air on detection is avoided. When the temperature detector is used for measuring specifically, the temperature of condensed water and condensed gas can be monitored in real time through the temperature detector, and when the temperature reaches a set range, the oxygen content can be detected. Set up in liquid detection case 3 and gas detection case 4 in order, do benefit to disposable condensed water and the condensate gas of collecting, realize the real-time on-line measuring to oxygen content in the high temperature fluid, improve detection efficiency.
Optionally, a check valve 7 is arranged between two adjacent gas test chambers 4.
As shown in fig. 2, the check valve 7 is used to ensure that the gas in the pipeline can be discharged only from the bottom to the top, and the influence of the outside air on the components of the condensed gas is avoided. Meanwhile, a third stop valve 8 can be arranged between the two gas testing boxes 4, and in the testing process, the third stop valve 8 is always in an open state, so that the condensed gas and the high-temperature fluid can smoothly pass through the third stop valve. The gas test box 4 is adopted to achieve a certain buffering effect when the condensed gas passes through the gas test box 4, so that the oxygen content is convenient to detect, and the volume or the inner diameter of the gas test box 4 is far larger than the inner diameter of a pipeline connected between the tee joint 2 and the gas test box 4.
Optionally, the device for detecting the oxygen content in the geothermal well in this embodiment further includes a liquid level meter 9, and the liquid level meters 9 are respectively disposed in the liquid testing box 3 and the gas testing box 4.
The level gauge 9 is used for detecting the liquid level of the condensed water in the liquid test box 3 and the gas test box 4, is convenient for realizing detection, and is convenient for detecting the liquid level of the condensed water in the process of cleaning a pipeline and cleaning the liquid test box 3 and the gas test box 4 so as to control a valve. Specifically, before detection, the liquid test box 3, the gas test box 4 and pipelines between the liquid test box and the gas test box need to be cleaned, the first stop valve 5, the second stop valve 6 and the third stop valve 8 are firstly opened, cooling water does not pass through the condenser 1, high-temperature fluid can directly enter the liquid test box 3, the gas test box 4 and the pipelines between the liquid test box and the gas test box, after the high-temperature fluid and the cooling water start to condense in the condenser 1 after a period of ventilation, and condensed water and condensed gas start to be collected for detection. The detection step comprises: the second stop valve 6 at the bottom of the second liquid test box 32 is closed, the condensed water is collected until the liquid level of the condensed water reaches the full level of the gas test box 4, the liquid level of the condensed water is detected through the liquid level meter 9, then the second stop valve 6 is opened to drain until the condensed water in the second liquid test box 32 is about to drain completely, the second stop valve 6 is closed, the first liquid test box 32, the first liquid test box 31 and the at least one gas test box 4 are waited for the condensed water to fill up again, the second stop valve 6 is opened again to drain, the operation is repeated for 2-3 times, the air in the liquid test box 3, the gas test box 4 and the pipeline between the liquid test box and the gas test box before detection can be completely removed, and then the formal detection is started. Ensuring that a certain amount of condensed water exists in the second liquid testing box 32, closing the first stop valve 5, keeping the third valve 8 between the gas testing boxes 4 in an open state all the time, measuring the oxygen content in the condensed water after a certain amount of condensed water liquid is collected in the first liquid testing box 31, simultaneously measuring the oxygen content in the condensed gas passing through the gas testing box 4 closest to the tee joint 2, and adding the oxygen content and the oxygen content to obtain the total oxygen content of the high-temperature fluid.
Optionally, a high-pressure hand valve 11, a high-pressure needle valve 12, a flow valve 13 and a pressure gauge 14 are arranged on the steam pipeline in sequence from the wellhead main valve to the condenser 1.
The high-pressure hand valve 11 and the high-pressure needle valve 12 are connected, and mainly prevent high-temperature and high-pressure steam from hurting people. The flow valve 13 is used for controlling the flow rate of high-temperature fluid entering the condenser 1, and the pressure gauge 14 is arranged in front of the inlet of the condenser 1 and used for monitoring the pressure in the steam pipeline and preventing safety accidents caused by the blockage of the steam pipeline.
The first embodiment is as follows: and (3) selecting a geothermal well with serious corrosion on site, particularly a geothermal well with high-temperature fluid, and finding out an interface position which does not influence the production of the geothermal well at the position of a wellhead main valve of the geothermal well or using the waste interface position as a high-temperature fluid pipeline connection outlet.
Since the cooling steam contains a certain amount of corrosive gas, 316L stainless steel (designation: 022Cr17Ni12Mo2) was selected as the material of the cooling pipe, and DN15(φ 21X 3) was selected as the path. The tee joint 2 is an equal-diameter tee joint.
Assembling the device: a steam pipeline is connected to the inlet of the condenser 1 at a main valve of a wellhead, a high-pressure hand valve 11, a high-pressure needle valve 12 and a flow valve 13 are sequentially arranged on the steam pipeline, and the flow valve 13 is connected with a pressure gauge 14. The condenser 1 and the cooling water tank are fixed on the frame, and the cooling water tank is arranged on the frame and is connected with cooling pipelines in sequence. The outlet of the condenser 1 is connected with an equal-diameter tee joint 2, a second port of the equal-diameter tee joint 2 is downwards and sequentially connected with a first liquid testing box 31, a first stop valve 5, a second liquid testing box 32 and a second stop valve 6 from bottom to top, a third port of the equal-diameter tee joint 2 is upwards and sequentially connected with two gas testing boxes 4 from bottom to top, and a pipeline between the two gas testing boxes 4 is sequentially connected with a third stop valve 8 and a one-way valve 7. The second liquid testing tank 32, the first liquid testing tank 31 and the gas testing tank 4 are arranged in this order in the vertical direction and fixed to the frame.
And oxygen content detection, namely closing the high-pressure hand valve 11 and the high-pressure needle valve 12, opening the first stop valve 5, the second stop valve 6 and the third stop valve 8, slowly opening the high-pressure hand valve 11 and the high-pressure needle valve 12, ventilating the whole detection device for a period of time to clean the pipeline, and then starting oxygen content detection.
After the oxygen content is tested, the high-pressure hand valve 11 and the high-pressure needle valve 12 are closed, and then the first stop valve 5, the second stop valve 6 and the third stop valve 8 in the detection device are closed. And (4) checking whether each part of the detection device is damaged or not in detail, if so, updating the intact part, and cleaning each part of the detection device for next use.
In the above embodiment, the corrosion speed of the pipe in the process medium environment can be predicted through the test result of the oxygen content, the equipment corrosion information is fed back to engineering technicians in real time, the degree and the form of corrosion can be indirectly judged, and the use effect (such as material selection, process corrosion prevention and the like) of the control method can be monitored. The device has the advantages that early warning can be carried out on corrosion hidden dangers through the test result of the oxygen content, the service state of the equipment pipeline can be evaluated, the service life of the equipment pipeline is predicted, the maintenance plan of the equipment pipeline is made to be helpful, and the device has important practical significance.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A method for detecting the oxygen content of a geothermal well is characterized by comprising the following steps:
s1, collecting high-temperature fluid of the geothermal well;
s2, condensing the high-temperature fluid, and respectively collecting condensed water and condensed gas after condensation;
and S3, detecting the oxygen contents in the condensed water and the condensed gas respectively, and adding the two to obtain the total oxygen content.
2. The method for detecting the oxygen content in the geothermal well according to claim 1, wherein in step S2, the step of condensing the high-temperature fluid comprises:
the high-temperature fluid firstly enters a condenser (1); the outlet of the condenser (1) is connected with a first port of the tee joint (2), a second port of the tee joint (2) is connected with the liquid testing box (3) downwards to collect the condensed water, and a third port is connected with the gas testing box (4) upwards to collect the condensed gas.
3. The method for detecting the oxygen content in the geothermal well according to claim 2, further comprising a step of cleaning a pipeline before condensing the high-temperature fluid in step S2, specifically:
s21, the condenser (1) closes the cooling liquid input channel, and the liquid test box (3) and the gas test box (4) are both in an open state and are both communicated with the outside; the high temperature fluid can enter the condenser (1), the liquid test tank (3) and the gas test tank (4) to clean the condenser (1), the liquid test tank (3) and the gas test tank (4);
s22, the condenser (1) opens the cooling liquid input channel, a second stop valve (6) at the bottom of the liquid test box (3) is closed, and condensed water is collected until the liquid level is higher than the top of the gas test box (4);
s23, opening the second stop valve (6) at the bottom of the liquid test box (3), and discharging water until the liquid level reaches the bottom of the liquid test box (3);
s24, repeating the steps S22-S23 at least twice.
4. Method for detecting the oxygen content of a geothermal well according to claim 3, characterized in that the liquid test tank (3) comprises at least a first liquid test tank (31) and a second liquid test tank (32), the first liquid test tank (31) being in an elevated position with respect to the second liquid test tank (32) and the second port of the tee (2) being connected to the first liquid test tank (31), a first stop valve (5) is arranged between the first liquid testing box (31) and the second liquid testing box (32), before oxygen content detection is carried out, the first stop valve (5) is in an open state, the second liquid test tank (32) collects the condensed water, then closing the first shut-off valve (5), the first liquid test tank (31) collecting the condensed water, and detecting the oxygen content of the condensed water collected in the first liquid testing tank (31).
5. The utility model provides a geothermal well oxygen content detection device which characterized in that includes:
the input end of the condenser (1) is connected with a wellhead through a steam pipeline so as to collect and condense high-temperature fluid;
the three-way condenser comprises a three-way pipe (2), wherein a first port of the three-way pipe (2) is connected with the output end of the condenser, a second port is connected with a liquid testing box (3) downwards to collect condensed water, a third port is connected with a gas testing box (4) upwards to collect condensed gas, the condensed water is subjected to oxygen content detection and the condensed gas is subjected to oxygen content detection respectively, and the total oxygen content is obtained by adding the condensed water and the condensed gas.
6. The geothermal well oxygen content detection device according to claim 5, wherein the liquid test box (3) comprises at least a first liquid test box (31) and a second liquid test box (32), the first liquid test box (31) is at a high position relative to the second liquid test box (32) and the first liquid test box (31) is connected with the second port of the tee joint (2), and a first stop valve (5) is arranged between the first liquid test box (31) and the second liquid test box (32); and a second stop valve (6) is arranged at the bottom of the second liquid testing box (32).
7. The geothermal well oxygen content detection device according to claim 6, wherein at least two gas test boxes (4) are arranged, at least two gas test boxes (4) are sequentially connected in series in the vertical direction, and the gas test boxes (4) are at a high position relative to the liquid test boxes (3).
8. The geothermal well oxygen content detection device according to claim 7, wherein a one-way valve (7) is arranged between two adjacent gas test boxes (4).
9. The geothermal well oxygen content detection device according to claim 7, further comprising a liquid level meter (9), wherein the liquid level meter (9) is arranged in the liquid test box (3) and the gas test box (4).
10. The geothermal well oxygen content detection device according to claim 5, wherein a high pressure hand valve (11), a high pressure needle valve (12), a flow valve (13) and a pressure gauge (14) are sequentially arranged on the steam pipeline from a main valve at a wellhead to the condenser (1).
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