CN113670805A - System for simulating field dynamic corrosion of acidic natural gas field - Google Patents
System for simulating field dynamic corrosion of acidic natural gas field Download PDFInfo
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- CN113670805A CN113670805A CN202111059681.5A CN202111059681A CN113670805A CN 113670805 A CN113670805 A CN 113670805A CN 202111059681 A CN202111059681 A CN 202111059681A CN 113670805 A CN113670805 A CN 113670805A
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- depressurization
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 238000005260 corrosion Methods 0.000 title claims abstract description 76
- 230000007797 corrosion Effects 0.000 title claims abstract description 76
- 239000003345 natural gas Substances 0.000 title claims abstract description 40
- 230000002378 acidificating effect Effects 0.000 title description 11
- 239000000523 sample Substances 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000007789 gas Substances 0.000 claims abstract description 30
- 238000004088 simulation Methods 0.000 claims abstract description 25
- 230000006837 decompression Effects 0.000 claims abstract description 16
- 239000002253 acid Substances 0.000 claims abstract description 5
- 238000012546 transfer Methods 0.000 claims description 11
- 239000003513 alkali Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 abstract description 10
- 238000012545 processing Methods 0.000 abstract description 6
- 238000011160 research Methods 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 2
- 230000018109 developmental process Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 6
- 230000018044 dehydration Effects 0.000 description 5
- 238000006297 dehydration reaction Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000000840 electrochemical analysis Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/04—Corrosion probes
Abstract
The utility model provides a system for on-spot developments of simulation acid natural gas field are corroded, which comprises an air supply, the air supply connects gradually simulation depressurization pipeline, the depressurization removes the water pitcher, first buffer tank, the second booster pump, simulation pipeline and tail gas processing apparatus, be equipped with two at least decompression elbows and a first relief pressure valve on the simulation depressurization pipeline, be equipped with two at least delivery elbows and a straight tube section on the simulation pipeline, set up a corrosion probe and a corruption lacing film on two at least decompression elbows respectively, set up a corrosion probe and a corruption lacing film on two at least delivery elbows respectively, the straight tube section of simulation pipeline is equipped with at least one corrosion probe and a corruption lacing film, depressurization removes water tank deck portion and is equipped with a corrosion probe and a corruption lacing film. Under the condition of fully considering the actual working conditions, the continuous corrosion condition and the long-term corrosion condition in the straight pipe section, the elbow and the pressure reduction water removal tank of the pipeline are monitored, so that the measured result has reference and research values.
Description
Technical Field
The invention relates to the technical field of natural gas storage and transportation, in particular to a system for simulating field dynamic corrosion of an acidic natural gas field.
Background
The acidic natural gas is natural gas containing a large amount of acidic gases such as hydrogen sulfide, carbon dioxide and the like, and meanwhile, most of natural gas extracted at home and abroad at present is saturated with water vapor, so that the corrosion problem of equipment and pipelines is the first problem when the acidic natural gas is extracted in a gas field. Therefore, according to the specific working condition of the acidic natural gas, the equipment and the pipeline which are made of proper materials and have corrosion resistance are the first prerequisite for ensuring the safety and economic development of the acidic natural gas.
When selecting materials, firstly, a dynamic corrosion experiment needs to be carried out to simulate the tolerance of various materials to the acidic natural gas under the working condition, or a proper corrosion inhibitor is selected according to the experimental result. The traditional method is a static hanging piece method, but the complex environment faced by the natural gas of the gas field is difficult to simulate, and meanwhile, the high pressure and high flow rate of the mined natural gas of the gas field are also difficult to simulate by the traditional method, so that a technical worker improves the method, for example, Chinese patent CN209606292U discloses a moisture corrosion loop experimental device for simulating the corrosion environment in the natural gas pipeline, the gas flow rate is controlled by a circulating fan, and meanwhile, an electric pole probe, an electrochemical test, a corrosion hanging piece and the like are arranged for monitoring pipeline corrosion. However, the device has the problems that not only straight pipes but also a large number of elbows exist in an actual pipeline, the elbows are usually welded and belong to a serious disaster area of corrosion, and meanwhile, the natural gas also passes through a long transportation pipeline and a dehydration process before being desulfurized and decarbonized, and the process is not considered in the existing equipment.
Disclosure of Invention
In view of the above, the present invention provides a system for simulating field dynamic corrosion of an acid natural gas field, which monitors the continuous corrosion condition and the long-term corrosion condition of the straight pipe section, the elbow and the pressure reduction water removal tank of the pipeline under the condition of fully considering the actual working conditions, so that the measured result has reference and research values.
The technical scheme provided by the invention is that the system for simulating the field dynamic corrosion of the acid natural gas field comprises a gas source, wherein the gas source is sequentially connected with a simulation depressurization pipeline, a depressurization water removal tank, a first buffer tank, a second booster pump, a simulation conveying pipeline and a tail gas treatment device, the simulation depressurization pipeline is provided with at least two depressurization elbows and a first pressure reducing valve, the simulation conveying pipeline is provided with at least two conveying elbows and a straight pipe section, and the length of the simulation conveying pipeline is at least 10 times of the height of the depressurization water removal tank; at least two the last corrosion probe and the corrosion lacing film of setting up respectively of decompression elbow, set up a corrosion probe and a corrosion lacing film on two at least delivery elbows respectively, the straight tube section of simulation pipeline is equipped with at least one corrosion probe and a corrosion lacing film, decompression dewatering tank top is equipped with a corrosion probe and a corrosion lacing film.
One embodiment of the invention is that the simulated reduced pressure pipeline and the simulated transmission pipeline are both hard pipes.
Furthermore, a drain pipe is arranged at the bottom of the depressurization dewatering tank.
In one embodiment of the invention, the simulated transport pipeline is composed of a plurality of straight pipe sections and a plurality of transport elbows, and the plurality of straight pipe sections are arranged in parallel.
Furthermore, on the simulation conveying pipeline, the corrosion probe and the corrosion hanging piece are arranged on two adjacent conveying elbows.
One embodiment of the invention is that a first booster pump is arranged between the gas source and the simulated reduced pressure pipeline.
One embodiment of the invention is that the tail gas treatment device consists of a second buffer tank, an alkali liquor tank and a micro torch which are connected in sequence, and the second buffer tank is connected with the simulated transmission pipeline.
The invention has the technical effects that: under the condition of fully considering the actual working conditions, the continuous corrosion condition and the long-term corrosion condition in the straight pipe section, the elbow and the pressure reduction water removal tank of the pipeline are monitored, so that the measured result has reference and research values; through setting up tail gas processing apparatus for the natural gas after the use can not cause the influence to the environment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of portion A of FIG. 1;
FIG. 3 is a schematic structural diagram of portion B of FIG. 1;
FIG. 4 is a schematic structural diagram of the depressurization dewatering tank.
In the figure, 1 is a gas source, 2 is a first booster pump, 3 is a simulated pressure reduction pipeline, 4 is a pressure reduction water removal tank, 5 is a buffer tank, 6 is a second booster pump, 7 is a simulated delivery pipeline, 8 is a second buffer tank, 9 is an alkali liquor tank, 10 is a micro torch, 11 is a first pressure reduction valve, 12 is a second pressure reduction valve, 13 is a corrosion coupon, 14 is a corrosion probe, 31 is a pressure reduction elbow, 32 is a pressure reduction straight pipe, 41 is a drain pipe, 71 is a delivery elbow, and 72 is a straight pipe section.
Detailed Description
The present invention will be described in further detail with reference to the following examples and the accompanying drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
Example (b):
a system for simulating field dynamic corrosion of an acid natural gas field comprises a gas source 1, wherein the gas source 1 is sequentially connected with a simulated depressurization pipeline 3, a depressurization water removal tank 4, a first buffer tank 5, a second booster pump 6, a simulated conveying pipeline 7 and a tail gas treatment device, the simulated depressurization pipeline 3 is provided with at least two depressurization elbows 31 and a first pressure reducing valve 11, the simulated conveying pipeline 7 is provided with at least two conveying elbows 71 and a straight pipe section 72, and the length of the simulated conveying pipeline 7 is at least 10 times of the height of the depressurization water removal tank 4; at least two pressure reducing elbows 31 are respectively provided with a corrosion probe 14 and a corrosion hanging piece 13, at least two conveying elbows 71 are respectively provided with a corrosion probe 14 and a corrosion hanging piece 13, the straight pipe section 72 of the simulation conveying pipeline 7 is provided with at least one corrosion probe 14 and one corrosion hanging piece 13, and the top of the pressure reducing dewatering tank 4 is provided with one corrosion probe 14 and one corrosion hanging piece 13.
Specifically, referring to fig. 1, an air source 1 is a tank body, and the inside of the tank body is filled with acidic natural gas saturated with water vapor for simulating the produced high-water-content acidic natural gas; after the natural gas is produced, the natural gas is usually depressurized by throttling measures, so that an outlet of the gas source 1 is connected with a simulated depressurization line 3, and in the embodiment, depressurization is performed by connecting a first depressurization valve 11 to the simulated depressurization line 3.
Referring to fig. 2, in the simulated reduced pressure pipeline 3, at least two reduced pressure elbows 31 are provided, two adjacent reduced pressure elbows 31 are taken, one corrosion probe 14 and one corrosion coupon 13 are respectively arranged on the two adjacent reduced pressure elbows 31, and meanwhile, adjacent corrosion probes 14 and corrosion coupons 13 are arranged on a reduced pressure straight pipe 32, wherein the corrosion probes 14 can adopt currently common inductance probes or electrochemical probes, both of which can record corrosion and changes thereof in real time, so as to provide data support for subsequent corrosion mechanism research and corrosion prevention. Meanwhile, because the system is an experiment simulation system, the pipe diameters of all pipelines are smaller under the condition of considering the cost, therefore, in order to avoid the influence of high-speed natural gas on the corrosion coupon 13 and the corrosion probe 14 in the measurement process, the probability of collision between the corrosion coupon 13 and the corrosion probe 14 and the pipe wall is reduced, the precision of the experiment result is improved, the simulation reduced-pressure pipeline 3 is set to be a hard pipe which can be a hard PVP pipe, a steel pipe, an iron pipe and the like, and meanwhile, the corrosion coupon 13 is suspended by a material which is not easy to deform, such as a hard steel wire and the like.
Referring to fig. 1, in some embodiments, because the pressure in the gas source 1 is insufficient and the pressure during natural gas production is high, a first booster pump 2 is disposed between the gas source 1 and the simulated depressurization line 3 for boosting the natural gas to simulate the formation conditions and make it closer to the actual production environment.
Referring to fig. 1 and 4, the depressurization dewatering tank 4 is mainly used for dewatering by utilizing the characteristic that a large amount of water is separated out when natural gas generates pressure drop in the simulated depressurization pipeline 3, and the upper part of the depressurization dewatering tank 4 is communicated with the first buffer tank 5. In the actual exploitation process of the natural gas, the exploited natural gas is subjected to a subsequent desulfurization process only through one-time coarse dehydration, so that the depressurization dehydration tank 4 actually simulates the process. The pressure reduction dewatering tank 4 can adopt a small flash tank, a dewatering tank and the like.
Referring to fig. 4, because in the decompression except that water pitcher 4, the pressure of natural gas, the moisture content can change, and simultaneously, the shape of decompression except that water pitcher 4 and simulation decompression pipeline 3 is different, also different in the corruption condition and the simulation decompression pipeline 3, consequently, it is also necessary to monitor the corruption condition of decompression except that water pitcher 4, consequently, set up a corruption lacing film 13 and corrosion probe 14 at decompression except that water pitcher 4 top, and simultaneously, along with the continuation of experiment, there can be a large amount of water in decompression except that water pitcher 4 bottom, in order to discharge the water in the decompression except that water pitcher 4, be provided with a drain pipe 41 in decompression except that water pitcher 4 bottom, after the water in the decompression except that water pitcher 4 accumulates to a certain extent, discharge water through drain pipe 41.
Referring to fig. 1, the first buffer tank 5 is for buffering between the depressurization dehydration tank 4 and the second booster pump 6, and after the natural gas is depressurized in the depressurization dehydration tank 4, the water content becomes low and the pressure becomes low, so that in order to simulate the actual situation of the gas field site, the second booster pump 6 is arranged between the first buffer tank 5 and the simulation delivery pipeline 7, and the second booster pump 6 is used for boosting the natural gas so that the flow rate of the natural gas in the simulation delivery pipeline 7 approaches the actual working condition.
Referring to fig. 1, in actual conditions, the length of the transfer pipeline is longer, therefore, in this embodiment, the length of the simulated transfer pipeline 7 is set to be more than 10 times the height of the depressurization water removal tank 4, so as to simulate the actual conditions of the gas field, in actual conditions, the length of the transfer pipeline is longer, therefore, in this embodiment, the simulated transfer pipeline 7 with longer length needs to be set, but, the length of the simulated transfer pipeline is related to the pipe diameter and the air intake amount, while the height of the depressurization water removal tank 4 is related to the air intake amount, therefore, through a large number of experiments of the inventor, only when the length of the simulated transfer pipeline 7 is more than 10 times the height of the depressurization water removal tank 4, the final simulation result and the result error obtained by the actual conditions are smaller, the pipeline is longer, the similarity is higher, but when the length of the simulated transfer pipeline 7 is less than 10 times the height of the depressurization water removal tank 4, the difference between the final measured result and the actual working condition is large. Meanwhile, in order to reduce the occupied space, the analog conveying pipeline 7 is divided into a plurality of straight pipe sections 72 and a plurality of conveying elbows 71, each straight pipe section 72 is arranged in parallel, and the straight pipe sections 72 are connected through the conveying elbows 71. The advantage of this arrangement is that the actual conditions are simulated, while the space occupied by the whole system is reduced.
Referring to fig. 3, two adjacent conveying elbows 71 are selected, a corrosion coupon 13 and a corrosion probe 14 are respectively arranged, meanwhile, the corrosion coupon 13 and the corrosion probe 14 are arranged on a straight pipe section 72, and the straight pipe section 72 and the conveying elbows 71 of the simulated conveying pipeline 7 are monitored. Because this system is the experiment simulation system, under the circumstances of considering the cost, the pipe diameter of all pipelines is all less, consequently, in order to avoid corroding hanger plate 13 and corrosion probe 14 to receive the influence of high-speed natural gas in the measurement process, reduce the probability that corrodes hanger plate 13 and corrosion probe 14 needle and pipe wall collision, improve the precision degree of experimental result, set up simulation conveying line 7 into hard pipe, specifically can be stereoplasm PVP pipe, steel pipe, iron pipe etc. simultaneously, hang corrosion hanger plate 13 with the material that is difficult for deformation, like stereoplasm steel wire etc..
Referring to fig. 1, the tail gas treatment device is composed of a second buffer tank 8, an alkali liquor tank 9 and a micro torch 10 which are connected in sequence, wherein alkali liquor, usually sodium hydroxide, sodium carbonate and the like, is filled in the alkali liquor tank 9 and can absorb hydrogen sulfide in natural gas, and the natural gas is flammable and explosive hazardous gas and cannot be discharged at will, so that the micro torch 10 is arranged to burn the natural gas after the test, and meanwhile, the second buffer tank 8 is connected with a simulation conveying pipeline 7. In order to avoid overlarge pressure drop and overlarge flow speed in the simulated conveying pipeline 7 and simultaneously consider the processing capacity and the processing effect of the tail gas processing device, the tail end of the simulated conveying pipeline 7 is provided with the second pressure reducing valve 12, the second pressure reducing valve 12 can enable the simulated conveying pipeline 7 to maintain certain pressure, and meanwhile, the natural gas cannot flow at the overlarge flow speed in the tail gas processing device.
In the description of the present invention, it is to be noted that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and should not be construed as limiting the present invention.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the embodiments of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A system for simulating field dynamic corrosion of an acid natural gas field is characterized by comprising a gas source, wherein the gas source is sequentially connected with a simulated depressurization pipeline, a depressurization water removal tank, a first buffer tank, a second booster pump, a simulated conveying pipeline and a tail gas treatment device, the simulated depressurization pipeline is provided with at least two depressurization elbows and a first pressure reducing valve, the simulated conveying pipeline is provided with at least two conveying elbows and a straight pipe section, and the length of the simulated conveying pipeline is at least 10 times of the height of the depressurization water removal tank; at least two the last corrosion probe and the corrosion lacing film of setting up respectively of decompression elbow, set up a corrosion probe and a corrosion lacing film on two at least delivery elbows respectively, the straight tube section of simulation pipeline is equipped with at least one corrosion probe and a corrosion lacing film, decompression dewatering tank top is equipped with a corrosion probe and a corrosion lacing film.
2. The system of claim 1, wherein the simulated reduced pressure line and the simulated transfer line are both hard pipe.
3. The system of claim 2, wherein the reduced pressure dewatering tank is provided with a drain at a bottom thereof.
4. The system of claim 1, wherein the simulated transfer line is comprised of a plurality of straight pipe sections and a plurality of transfer elbows, and the plurality of straight pipe sections are connected by transfer elbows.
5. The system of claim 4, wherein the corrosion probe and corrosion coupon are disposed on two adjacent delivery elbows on the simulated delivery line.
6. The system of claim 1, wherein a first booster pump is further disposed between the gas source and the simulated reduced pressure line.
7. The system of claim 1, wherein the tail gas treatment device consists of a second buffer tank, an alkali liquor tank and a micro flare which are connected in sequence, and the second buffer tank is connected with the simulated transmission pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111059681.5A CN113670805A (en) | 2021-09-10 | 2021-09-10 | System for simulating field dynamic corrosion of acidic natural gas field |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111059681.5A CN113670805A (en) | 2021-09-10 | 2021-09-10 | System for simulating field dynamic corrosion of acidic natural gas field |
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2021
- 2021-09-10 CN CN202111059681.5A patent/CN113670805A/en active Pending
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