CN104865179A - Evaluation testing device of corrosion inhibitor membrane layer of gathering and transportation pipeline - Google Patents
Evaluation testing device of corrosion inhibitor membrane layer of gathering and transportation pipeline Download PDFInfo
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- CN104865179A CN104865179A CN201510213281.3A CN201510213281A CN104865179A CN 104865179 A CN104865179 A CN 104865179A CN 201510213281 A CN201510213281 A CN 201510213281A CN 104865179 A CN104865179 A CN 104865179A
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Abstract
The invention belongs to the technical field of corrosive prevention in an acid natural gas gathering and transportation pipeline, and particularly relates to a testing device of a corrosion inhibitor membrane layer for resisting hydrogen sulfide and acid corrosion. An evaluation testing device of a corrosion inhibitor membrane layer of a gathering and transportation pipeline, wherein a high pressure kettle and a gas circulating pump are arranged on a lower pipeline of a loop pipeline, and a gas circular pump is located at the left side of the high pressure kettle; several holes are arranged on the upper pipeline of the loop pipeline; an electrical resistance probe, an electrochemistrical probe, a weightless sample, a hygrothermograph, a pressure gauge and a sampler are orderly placed in the holes; corresponding to the lower part of the weightless sample, a hole is arranged on a pipeline on the upper portion of the loop pipeline, and a thickness measuring probe is placed in the hole; an access opening is arranged on the upper pipeline of the loop pipeline, and the access opening is provided with an atomizing nozzle and connected with a corrosion inhibitor storage tank; an outlet of the corrosion inhibitor storage tank is provided with a boosting pump, and the side pipeline of the loop pipeline is connected with a testing gas steel bottle through the gas valve; the weightless sample is connected with an external electrochemistrical work station through a lead.
Description
Technical field
Sour natural gas gathering line internal corrosion prevention technology field of the present invention, be specifically related to a kind of anti-H 2 S, antiacid corrosion corrosion inhibiter rete evaluate testing equipment.
Background technology
Anti-corrosion approach for acid gas field gathering system mainly contains three kinds: select resistant material, inside coating or lining, and filling corrosion inhibiter.Resistant material cost is high, and coated liner difficulty of construction is large, and easily aging coming off causes plugging, and corrosion inhibiter of annotating both economically reliably can control corrosive pipeline very flexibly, thus uses the most extensive in pipeline corrosion protection engineering.For this reason, corrosion expert both domestic and external successfully develops the various corrosion inhibiter being adapted to acid gas field by engineering practice, adopts the mode of filling continuously in inner-walls of duct corrosion inhibiter pre-coating film and gas transmission process to carry out the corrosion protection of collection transmission pipe network aborning.
Although these corrosion inhibiter have certain corrosion mitigating effect in static high containing in H2S/CO2 sour environment, in the flow media of acid gas field, corrosion inhibiter rete may lose corrosion inhibition due to the shear action of flow media from pipe surface desorption.The corrosion mitigating effect of inner-walls of duct is very large by the impact of nowed forming, flow characteristics under various nowed forming has significant difference, suffered by the inhibitor film of inner-walls of duct, shear force also has significant difference, thus affect the conveying of corrosion inhibiter, distribution, attachment, and the rule of the formation of corrosion inhibition film, stable, destruction, reparation etc., thus cause the corrosion mitigating effect of corrosion inhibiter also different, but the inhibitor film of at present inner-walls of duct institute precoating its corrosion mitigating effect and ageing shortage effective evaluation method and detection means under the souring of flow media.
In addition, for the charging method of acid gas field gathering system corrosion inhibiter, shortage effective method and equipment inject the corrosion mitigating effect of corrosion inhibiter continuously under carrying out the effect of opinion on evaluation flow media, the dosage of continuous injection corrosion inhibiter is also difficult to determine accurately and effectively, brings certain difficulty to acid gas field corrosion control.
Current existing rete evaluation focuses mostly in fields such as static evaluation device and evaluation model calculating, there is no the comprehensive evaluation device of corrosion inhibiter rete and filling continuously under dynamic environment, determination and evaluation result and effect of field application deviation are comparatively large, can not reflect the true effect of corrosion inhibiter.
Summary of the invention
The object of the invention is to the usefulness not dynamic accurate evaluation problem for acid gas field gathering line system inhibiter rete and filling continuously, a kind of acid gas gathering line corrosion inhibiter usefulness checking and appraising test unit is provided.
Technical scheme of the present invention is:
A kind of gathering line corrosion inhibiter rete evaluation experimental device, comprise loop pipeline, the below pipeline of loop pipeline is provided with autoclave and gas circulator, gas circulator is positioned at the left side of autoclave, the top pipeline of loop pipeline offers some holes, resistance probe is placed successively in hole, electrochemical probe, weightless sample, Hygrothermograph, tensimeter and sampler, above loop pipeline, on pipeline, the below of corresponding weightless sample is offered porose, thickness measuring probe is placed in hole, the top pipeline of loop pipeline arranges access port, access port place arranges atomizer, access port is connected with corrosion inhibiter storage tank, the exit of corrosion inhibiter storage tank arranges supercharge pump, the side pipeline of loop pipeline is connected with test gas steel cylinder by gas valve, described weightless sample is connected with outside electrochemical workstation by wire.
Concrete, described loop pipeline is made by 316L stainless steel or nickel-base alloy material.
Acid gas gathering line corrosion inhibiter rete evaluation experimental device provided by the invention, 316L stainless steel or nickel-base alloy material is adopted to manufacture, to the carbon dioxide of high pressure, high concentration, sulfuretted hydrogen moisture and acid solution, all there is excellent anticorrosive effect, can be used as high-hydrogen sulfide, carbon dioxide gas collector and delivery pipe corrosion inhibiter thickness evaluating apparatus or inhibition efficiency evaluating apparatus.This device is in order to the corrosion inhibiter rete benchmark test under lab simulation sour natural gas erosion condition, can need to adjust acid gas component, pressure and flow velocity according to test, and the dynamic monitoring achieved specimen surface corrosion inhibiter rete corrosion resistance and thickness, can the corrosion inhibiter of simulated condition dynamic evaluation inner surface of pipeline or the military service performance of drag reducer, for effective evaluation corrosion inhibiter service life, reduce corrosion inhibiter use cost operation foundation is provided.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
1 loop pipeline 2 autoclave 3 corrosion inhibiter storage tank 4 supercharge pump 5 atomizer 6 tensimeter
The weightless sample of 7 gas valve 8 thickness measuring probe 9 resistance probe 10 electrochemical probe 11
12 Hygrothermograph 13 sampler 14 gas circulator 15 test gas steel cylinder 16 electrochemical workstations.
Embodiment
A kind of gathering line corrosion inhibiter rete evaluation experimental device, comprise the loop pipeline 1 made by 316L stainless steel or nickel-base alloy material, the below pipeline of loop pipeline 1 is provided with autoclave 2 and gas circulator 14, autoclave 2 provides high pressure steam for loop pipeline 1, in order to simulate ducted wet gas environments, gas circulator 14 is positioned at the left side of autoclave 2, and gas circulator 14 provides circulating current for loop.
The top pipeline of loop pipeline 1 offers some holes, resistance probe 9 is placed successively in hole, electrochemical probe 10, weightless sample 11, Hygrothermograph 12, tensimeter 6 and sampler 13, above loop pipeline 1, on pipeline, the below of corresponding weightless sample 11 is offered porose, thickness measuring probe 8 is placed in hole, the top pipeline of loop pipeline 1 arranges access port, access port place arranges atomizer 5, access port is connected with corrosion inhibiter storage tank 3, the exit of corrosion inhibiter storage tank 3 arranges supercharge pump 4, corrosion inhibiter in corrosion inhibiter storage tank 3 is injected loop pipeline 1 by atomizer 5 and is carried by circulating current and flows in the loop after supercharge pump 4 supercharging.The side pipeline of loop pipeline 1 is connected with test gas steel cylinder 15 by gas valve, and described resistance probe 9, electrochemical probe 10 are connected with outside electrochemical workstation 16 by wire with weightless sample 11.
Test unit provided by the invention, first gas circulator 14 is opened before on-test, the ducted gas of loop produces circulating current in the direction of the clock, opening autoclave 2 again makes the ducted gas temperature of loop reach design temperature, open test gas steel cylinder 15 afterwards again for loop supercharging, open gas valve 7, test gas enters loop pipeline 1 through gas valve 7 simultaneously, finally opens supercharge pump 4 and provides atomization corrosion inhibiter for loop air flow.
Open electrochemical workstation 16, the resistance probe 9 that Real-time Collection is connected with workstation, electrochemical probe 10 and weightless sample 11 corrosion current and impedance data, corrosion inhibiter corrosion rate in the loop can be obtained, and then evaluate corrosion inhibiter film performance by corrosion rate.
Claims (2)
1. a gathering line corrosion inhibiter rete evaluation experimental device, comprise loop pipeline (1), the below pipeline of loop pipeline (1) is provided with autoclave (2) and gas circulator (14), gas circulator (14) is positioned at the left side of autoclave (2), it is characterized in that, the top pipeline of loop pipeline (1) offers some holes, resistance probe (9) is placed successively in hole, electrochemical probe (10), weightless sample (11), Hygrothermograph (12), tensimeter (6) and sampler (13), on the pipeline of loop pipeline (1) top, the below of corresponding weightless sample (11) is offered porose, thickness measuring probe (8) is placed in hole, the top pipeline of loop pipeline (1) arranges access port, access port place arranges atomizer (5), access port is connected with corrosion inhibiter storage tank (3), the exit of corrosion inhibiter storage tank (3) arranges supercharge pump (4), the side pipeline of loop pipeline (2) is connected with test gas steel cylinder (15) by gas valve, described resistance probe (9), electrochemical probe (10) is connected with outside electrochemical workstation 16 by wire with weightless sample (11).
2. according to claim 1, it is characterized in that, described loop pipeline (1) is made by 316L stainless steel or nickel-base alloy material.
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| CN201510213281.3A CN104865179B (en) | 2015-04-30 | 2015-04-30 | A kind of gathering line corrosion inhibiter film layer evaluation experimental device |
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| CN201510213281.3A CN104865179B (en) | 2015-04-30 | 2015-04-30 | A kind of gathering line corrosion inhibiter film layer evaluation experimental device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105928862A (en) * | 2016-04-19 | 2016-09-07 | 西南石油大学 | Monitoring device and monitoring method for on-line monitoring of corrosion degree of medium injected into gas-injection well |
| CN106950170A (en) * | 2017-03-23 | 2017-07-14 | 中国石油天然气股份有限公司 | The monitoring device of inhibitor film performance |
| CN107796749A (en) * | 2017-10-26 | 2018-03-13 | 西南石油大学 | A kind of corrosion inhibiter preferably and antiseptic effect evaluation experimental device and method |
| CN105823703B (en) * | 2016-05-24 | 2018-05-01 | 西南石油大学 | It is a kind of to wash away under operating mode the device and method for evaluating inhibitor film integrality |
| CN109100293A (en) * | 2018-08-14 | 2018-12-28 | 西南交通大学 | Bilateral corrosion type liner structure accelerated corrosion experimental rig and process for corrosion control |
| CN109596503A (en) * | 2018-11-01 | 2019-04-09 | 中国石油天然气集团有限公司 | A kind of in-service high sulfur-containing natural gas pipe material Adaptability Evaluation Method |
| CN110702595A (en) * | 2019-10-18 | 2020-01-17 | 西安石油大学 | Multifunctional automatic simulation test device for top corrosion of wet gas pipeline |
| CN113970505A (en) * | 2020-07-22 | 2022-01-25 | 中国石油天然气股份有限公司 | Device and method for evaluating diffusion behavior of corrosion inhibitor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105928862A (en) * | 2016-04-19 | 2016-09-07 | 西南石油大学 | Monitoring device and monitoring method for on-line monitoring of corrosion degree of medium injected into gas-injection well |
| CN105823703B (en) * | 2016-05-24 | 2018-05-01 | 西南石油大学 | It is a kind of to wash away under operating mode the device and method for evaluating inhibitor film integrality |
| CN106950170A (en) * | 2017-03-23 | 2017-07-14 | 中国石油天然气股份有限公司 | The monitoring device of inhibitor film performance |
| CN107796749A (en) * | 2017-10-26 | 2018-03-13 | 西南石油大学 | A kind of corrosion inhibiter preferably and antiseptic effect evaluation experimental device and method |
| CN107796749B (en) * | 2017-10-26 | 2020-02-07 | 西南石油大学 | Corrosion inhibitor optimization and corrosion prevention effect evaluation test device and method |
| CN109100293A (en) * | 2018-08-14 | 2018-12-28 | 西南交通大学 | Bilateral corrosion type liner structure accelerated corrosion experimental rig and process for corrosion control |
| CN109100293B (en) * | 2018-08-14 | 2022-02-01 | 西南交通大学 | Accelerated corrosion test device for bilateral corrosion type lining structure and corrosion control method |
| CN109596503A (en) * | 2018-11-01 | 2019-04-09 | 中国石油天然气集团有限公司 | A kind of in-service high sulfur-containing natural gas pipe material Adaptability Evaluation Method |
| CN110702595A (en) * | 2019-10-18 | 2020-01-17 | 西安石油大学 | Multifunctional automatic simulation test device for top corrosion of wet gas pipeline |
| CN110702595B (en) * | 2019-10-18 | 2022-06-17 | 西安石油大学 | Multifunctional automatic simulation test device for top corrosion of wet gas pipeline |
| CN113970505A (en) * | 2020-07-22 | 2022-01-25 | 中国石油天然气股份有限公司 | Device and method for evaluating diffusion behavior of corrosion inhibitor |
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