CN104251812B - High-acidity gas field wellbore string material optimization evaluation system and method - Google Patents
High-acidity gas field wellbore string material optimization evaluation system and method Download PDFInfo
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Abstract
The invention provides a high-acidity gas field wellbore string material optimization evaluation system and method, and belongs to the field of high-acidity gas field development. The high-acidity gas field wellbore string material optimization evaluation system includes a corrosion rate prediction model and a stress corrosion cracking boundary model; the corrosion rate prediction model includes H2S partial pressure-temperature, H2S partial pressure-CO2 partial pressure and elementary substance S-pH value corrosion rate prediction drawing boards; the stress corrosion cracking boundary model includes a failure boundary of a material under conditions of the temperature and the H2S partial pressure and a failure boundary of the material after sulfur is separated out under the conditions of the temperature and the H2S partial pressure. The system and the method solve the problems that due to a corrosion simulation evaluation method and a corrosion prediction model and software, a gas field highly containing H2S/CO2 is lack of basis on material selection, and provide a theoretical support for high-acidity gas field development and safety production.
Description
Technical field
The invention belongs to high sour gas well development field, and in particular to a kind of high sour gas well shaft column material is preferably commented
Valency system and method.
Background technology
Marine Basin is always the main region of China's oil-gas exploration and development, particularly in recent years, as basin oil gas is surveyed
Spy degree is improved, geological knowledge deepens continuously, the continuous progress of exploration engineering, and in Northeast Sichuan area general light, unit are found that successively
The gas reservoirs such as dam, bight, Luo Jiazhai, Tie Shan, Dukouhe, ferrum hillside.Gas reservoir Effective Reservoirs thickness is big, well yield is high, sulfur for these
Change hydrogen content height, reserves scale big.
Hidden due to marine gas and bury deep and high containing H2S and CO2The characteristics of, its development process will face many worlds
Technical barrier.In recovery process, along pit shaft uphill process, with temperature, the reduction of pressure, the component in gas is fluid
It is no to change, can particularly form sulfur deposition, whether can produce pressure of the fluid in pit shaft under hydrate, different output
Drop Changing Pattern etc. is not also grasped, and the selection shortage of wellbore materials is understood systematicly, and the gas field material higher than 1MPa is selected to lack
Weary guidance, to high H is contained2S and CO2The ununified understanding of the corrosion resisting property and corrosion resistance mechanism of material is to gas-field exploitation under environment
And conveyer belt carrys out very big technical barrier.
The high sour gas well shaft column optimization method of the present invention is for high sour gas well gas producing technology stage pit shaft material
Material corrosion evaluation and prediction and research and develop.Currently for high sour gas well shaft column in acid gas field pit shaft optimizing evaluation process
In, the physical parameter of high sour gas well pit shaft real fluid need to be obtained.Acid gas field H2S contents are high, and gas reservoir pressure is big.Exploited
Cheng Zhong, is possible have simple substance Sulfur releasing in the wellbore the characteristics of maximum, causes general smooth gas field gas flow condition in the wellbore
Extremely complex, the research of the natural gas multiphase flow flow model of deep-well is also not directed at present high containing H2S/CO2Special sex chromosome mosaicism, with
This operating mode is not adapted to toward multiphase flow theory.
In existing technology, international standard ISO15156 does not also give to the gas field material selection higher than 1MPa and instructs,
Contain H to high2S and CO2The ununified understanding of the corrosion resisting property and corrosion resistance mechanism of material, commenting with regard to nickel-base alloy under environment
H in highest VII level standard in valency method2S partial pressures also only have 3.5MPa, well below high sour gas well down-hole H2S partial pressure bars
Part, the Simulation evaluation of high sour gas well down-hole wellbore materials lacks standard and experience guidance, gives high sour gas well corrosion research work
Bring greatly challenge.
Height contains H2S/CO2In recovery process, there is problems with prior art in gas field：
1. due to H in recovery process2The presence of S, may in the wellbore form sulfur deposition, aborning once being formed
Sulfur is deposited, and can bring the serious harm of blocking flow channel or wellbore materials corrosion, or even scraps can producing well, at present,
In recovery process, it is impossible to judge whether in the wellbore form sulfur deposition；It is difficult to judge the position that sulfur is deposited；Gas is in pit shaft
It is difficult to predict along journey change of component rule；Height contains H2S/CO2Gas field pit shaft multiphase flow rule is failed to understand.
2nd, conventional corrosion evaluation method cannot be in the high H of experiment lab simulation2S partial pressures (＞ 3.5MPa) condition, and adopt mould
Intend the unpredictable material military service performance of corrosion evaluation experiment that site environment is carried out, lack sulfur deposit attack evaluation methodology.
3rd, the corrosion research both at home and abroad for material under high sour gas well environment is started late, and not yet being formed directly to supply
The corrosion prediction model of onsite application and software.General corrosion evaluation model and failure method of discrimination cannot overbased acidic gas field rings
The safety in utilization of material is analyzed judgement and carries out risk analyses under border.
At present, the means and method of systematic analysiss high sour gas well shaft column optimization design are not yet set up both at home and abroad.
The content of the invention
It is an object of the invention to solve a difficult problem present in above-mentioned prior art, there is provided a kind of high sour gas well wellbore tubular
Column material optimizing evaluation system and method, develops for high sour gas well and safety in production provides theory support.
The present invention is achieved by the following technical solutions：
A kind of high sour gas well shaft column material optimizing evaluation system, including corrosion rate forecast model and stress corrosion
Cracking boundary model；
The corrosion rate forecast model includes H2S partial pressures-temperature, H2S partial pressure-CO2The corrosion of partial pressure and simple substance S-pH values
Rate prediction chart board；
The stress corrosion cracking boundary model includes material in temperature and H2Failure Boundaries and sulfur analysis under S partial pressure conditions
Go out rear material in temperature and H2Failure Boundaries under S partial pressure conditions.
A kind of high sour gas well shaft column material optimizing evaluation method, methods described includes：
Determine environmental condition and parameter；
In high H2Speeding-up simulation test is carried out to the material corrosion performance of nickel-base alloy tubing and casing under S partial pressure conditions；
In high H2Speeding-up simulation test is carried out to the corrosive nature of carbon steel oil jacket tube material under S partial pressure conditions.
It is described to determine what environmental condition and parameter were realized in：
In analysis under conditions of the change of pit shaft each component, sulfur deposition, change of flow state and heat loss, set up height and contain H2S/CO2
Gas field pit shaft multiphase flow law forecasting model, the forecast model include comprehensive pressure-drop model, thermograde model and
Sulfur deposits forecast model.
It is described in high H2It is so to carry out speeding-up simulation test to the material corrosion performance of carbon steel tubing and casing under S partial pressure conditions
Realize：
1st, live gas field extraction aqueous solution is prepared, empirically aequum is added in high-temperature high-pressure reaction kettle；
2nd, in the pH value for ensureing with the solution is adjusted on the basis of work condition environment identical temperature and pressure value, test is made
Environment reaches maximum and oozes hydrogen saturation conditions；
3rd, it is high containing H in High Temperature High Pressure according to site environment parameter2S/CO2Carry out corrosion coupon and stress corrosion under environment
Research.
It is described in high H2Carrying out speeding-up simulation test to the corrosive nature of nickel-base alloy oil jacket tube material under S partial pressure conditions is
It is achieved in that：
1st, gas field scene extraction aqueous solution is prepared, empirically aequum is added in high-temperature high-pressure reaction kettle；
2nd, it is high containing H in High Temperature High Pressure according to site environment parameter on the basis of ambient temperature conditions are improved2S/CO2Ring
Carry out the research of corrosion coupon and stress corrosion under border.
It is described high containing H2S/CO2What environment was realized in：
1st, at room temperature using hydrogen sulfide gas cylinder to sealing high-temperature high-pressure reaction kettle in be passed through H2S gases；
2nd, H is treated2S fully dissolves, and when the dial gauge of high-temperature high-pressure reaction kettle shows pressure drop, H is passed through again2S gases；
3rd, H is repeated2S is passed through-dissolves-this cyclic process is passed through again so as to and dissolving reaches determination amount；
4th, heat temperature raising, makes H2S partial pressures reach the H for specifying2S partial pressure conditions；
5th, with gas cylinder directly by CO2Closed high-temperature high-pressure reaction kettle is passed through, is reached and is stopped after setting pressure.
Compared with prior art, the invention has the beneficial effects as follows：
The present invention solves high containing H2S/CO2Gas field selection lacks a difficult problem for foundation, it is proposed that corrosion simulated evaluation methodology and
Corrosion prediction model and software, develop for high sour gas well and safety in production provides theory support.
Meanwhile, the theory is successfully applied to into general smooth gas field development scene, the corrosion for successfully solving scene presence is asked
Topic, is optimized analysis to live material, and successfully promotes the production domesticization of nickel-bass alloy material, economic benefits.
The present invention is applied to all acid gas field material corrosions and evaluates and material selection, can particularly be used successfully to peracid
Property gas field material corrosion evaluate and material is selected.
Description of the drawings
Fig. 1 is H under different temperatures2The pressure of S
Fig. 2 is different H2Diffusible hydrogen content contrast under S partial pressure conditions
Fig. 3 is the erosion profile of nickel-base alloy G3 under the conditions of varying environment
Fig. 4 is the corrosion regularity of nickel-base alloy under different temperatures
Fig. 5 is the H of nickel-base alloy G32S partial pressures-temperature corrosion rate prediction chart board
Fig. 6 is the H of nickel-base alloy G32S partial pressure-CO2Partial pressure corrosion rate prediction module
Fig. 7 is the simple substance S-pH value corrosion rate prediction modules of nickel-base alloy G3
Fig. 8 is nickel-base alloy G3 based on temperature and H2The Failure Boundaries of S partial pressures
Fig. 9 is nickel-base alloy G3 temperature and H in the presence of elementary sulfur2The contraction Failure Boundaries of S partial pressures
Figure 10 corrosion evaluations software system is constituted.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
The invention provides a whole set of high sour gas well shaft column system optimization method, including two parts：Pit shaft material
Material corrosion accelerated evaluation test and Corrosion Evaluation system.
(1) high sour gas well wellbore materials corrosion accelerated evaluation test
It is an object of the invention to provide a set of evaluation high sour gas well tubing and casing material corrosion evaluation test method, this
Bright problem to be solved is to overcome existing experimental technique to meet simulation high sour gas well scene High Temperature High Pressure height containing H2S/
CO2The problem of environment, the analogue experiment method evaluating apparatus that the present invention is adopted are simple, and easy to operate, evaluation result is examined with actually
Nuclear phase is accorded with.
The present invention is achieved through the following technical solutions：
The invention provides one kind is in the high H of laboratory simulation2The analogue experiment method of S partial pressures, methods described is in low temperature
Under H is repeated2S is passed through-dissolves-this cyclic process is passed through again, reach and fully dissolve in media as well H2The purpose of S so as to molten
Solution reaches determination amount, and then heat temperature raising supercharging, makes H2S partial pressures reach the H for specifying2S partial pressure conditions.
Wherein high sour gas well wellbore materials corrosion accelerated evaluation test is included in the high H of laboratory simulation2The simulation of S partial pressures
Test method, carbon steel tubing and casing material corrosion performance speeding-up simulation evaluation methodology and nickel-base alloy tubing and casing material corrosion performance add
Fast simulation evaluation method, these three methods are the environmental condition analogy methods and evaluation taken to realize tubing string evaluation of material
Method, first method is used together respectively with latter two method, can complete high sour gas well variety classes tubing string material and comment
Valency needs, and rear both of which will be in high H2Carry out evaluation experimental under S partial pressures, then both are that carbon steel and nickel-base alloy are carried out respectively
Corrosion evaluation experiment.
Wherein Corrosion Evaluation system provides a set of high sour gas well tubing and casing material evaluation and optimization model and software, mainly
Two kinds of models and a kind of Corrosion Evaluation software system are predicted including corrosion rate prediction and stress corrosion cracking.
Jing scenes of the present invention application achieves good effect.
Pit shaft monitoring technology
Present invention aim at providing a kind of height that is directed to contains H2S/CO2The gas field wellbore fluids of gas field environmental quality design into
Part monitoring system.To be solved by this invention raising difficult questions for discussion be：Prior art is difficult to judge the position that sulfur is deposited, it is difficult to predict in pit shaft
Along journey change of component rule and it is difficult to predict H2S/CO2The series of problems of gas field pit shaft multiphase flow rule.
The present invention first with please number for 200910236674.0 patent " one kind to containing H2S/CO2Gas field pit shaft stream
Body composition monitoring system and its analysis method ", in analysis along the change of pit shaft each component, sulfur deposition, change of flow state and heat loss etc.
Under the conditions of, set up high containing H2S/CO2Gas field pit shaft multiphase flow law forecasting model；
The height of the foundation contains H2S/CO2The step of gas field pit shaft multiphase flow law forecasting model, (these were all original
Describe in detail in patent, so only briefly touching upon here) include；
(1) comprehensive pressure-drop model
(2) thermograde model
(1) and (2) model foundation：
It is theoretical according to Van der Waals state equation, for multicomponent system sets up model in Wellbore Flow Feature Segmentation, set up
Simultaneously the poised state therapeutic method to keep the adverse QI flowing downwards, the state equation of liquid phase P VT phase behavior can be accurately described, then description be derived by correlation formula flat
The computing formula of the weighing apparatus state therapeutic method to keep the adverse QI flowing downwards, liquidus temperature and pressure.
Meeting the well section of super critical condition, high sulfur-containing mixture itself has perhaps under Supercritical Conditions with gas
Property as multiphase, therefore regard high sulfur-containing mixture as compressed gas.Using high sulfur-containing gas dense gas thermodynamical model
Theoretical basiss, by the interaction factor in adjustment state equation and preferably conform to rule and improve the fitting of thermodynamical model
Effect.Model considers elementary sulfur physical dissolution process in high sulfur-containing gas, finally selects the empirical correlation mould of high sulfur-containing gas
Type, in the case where pit shaft gathers temperature and pressure data compared with horn of plenty, carries out parameters revision.
(3) sulfur deposition forecast model
Assumed condition is proposed first：
1. body is in semi-stability flow regime；
2. formation temperature is constant；
3. flow is constant；
4. stratum be level, uniform thickness and homogenizing, incompressible planar radial flow model.
Then on the basis of above-mentioned hypothesis, the utilization binomial equation description proposed by experiment using Forhceimer
Non-Darcy flow equation.The deposition fraction of elementary sulfur divides in the acid gas reservoir development process of foundation consideration nonequilibrium process
Cloth model, model considers the impacts of the factor to sulfur deposition fraction such as radial distance time；Subsequently in Elemental sulfur deposition distributed model
On the basis of, Elemental sulfur deposition is to formation porosity, permeability, sulfur-bearing saturation and the production limit when setting up consideration nonequilibrium process
The computation model of time effects, and the model to nonequilibrium process simplifies, and sets up the computation model of correspondence equilibrium process.
Experimental studies have found that, as temperature is raised, H2The saturated vapour pressure increase of S, dissolubility declines.Therefore it is molten in low temperature
Solution saturation H2After S, as the rising of temperature then has substantial amounts of H in solution2S is separated out, and makes H2The partial pressure increase of S.As shown in Figure 1.Root
According to this understanding, the present invention is fully dissolved by low temperature, then the method for pressure build up, has reached simulation high sour gas well high
H2The requirement of S partial pressure conditions, overcomes traditional method and is pressurized with booster pump merely, does not reach H needed for experiment2The problem of S partial pressures.
Above three models provide ambient parameter for following specific implementation step.
The specific implementation step of the inventive method is as follows：
1st, H is utilized at room temperature2S gas cylinders are passed through H in the high-temperature high-pressure reaction kettle of sealing2S gases, are passed through half a minute left
Stop behind the right side；
2nd, H is treated2S fully dissolves, and when the dial gauge of high-temperature high-pressure reaction kettle shows pressure drop, H is passed through again2S gases,
3rd, H is repeated2S is passed through-dissolves-this cyclic process is passed through again so as to and dissolving reaches determination amount；
4th, heat temperature raising, makes H2S partial pressures reach the H for specifying2S partial pressure conditions.
Carbon steel tubing and casing material corrosion performance speeding-up simulation evaluation methodology is that pH value of solution is adjusted on the basis of simulated condition
Value, enables test environment to reach maximum and oozes hydrogen saturation conditions, and according to site environment parameter, it is high containing H in High Temperature High Pressure2S/CO2Ring
Border is (because this method is narration H2S supercharging modes, CO2There is no problem for supercharging, so not referring to CO2, H is worked as in experiment2S
Partial pressure is reached after preset value, and CO is led to in autoclave2Gas is to setting pressure) under development corrosion coupon and stress corrosion
Etc. the research of performance.
Under high sour gas well environment, for carbon steel, carbon steel and low alloy steel with hydrogen damage ftracture based on, with
H2The increase of S partial pressures, the diffusible hydrogen of sample is also in increase, but diffusible hydrogen has an extreme value, i.e. H2S corrosion is oozed
Hydrogen can reach saturation.When diffusible hydrogen reaches saturation in sample, the damage that hydrogen is caused to sample is maximum.As shown in Figure 2.Root
According to this understanding, by the basis of simulated field working condition, adjusting solution ph, specific implementation step is such as the present invention
Under：
1st, prepare live gas field extraction aqueous solution (to be matched somebody with somebody in Oil Field stratum water ratio with analytical reagent and deionized water
System), during empirically aequum (amount of sample is crossed at energy end) adds high-temperature high-pressure reaction kettle；
2nd, solution ph is adjusted on the basis (with work condition environment identical temperature, pressure value) of simulated condition (with acid tune
It is whole), enable test environment to reach maximum and ooze hydrogen saturation conditions；
3rd, according to site environment parameter (main analog scene temperature and H2S、CO2Partial pressure and with the presence or absence of sulfur deposition),
In High Temperature High Pressure (H2S partial pressures are realized by the realization of step 4 method, CO2Partial pressure gas cylinder is passed directly into reality by closed autoclave
It is existing) it is high containing H2S/CO2Carry out the research such as corrosion coupon and stress corrosion under environment.
The nickel-base alloy tubing and casing material corrosion performance speeding-up simulation evaluation methodology is to improve ambient temperature conditions
On the basis of, simulated field ambient parameter is high containing H in High Temperature High Pressure2S/CO2Carry out the property such as corrosion coupon and stress corrosion under environment
The research of energy；
Found by lot of experiments research, corrosion resistant alloy is mainly based on anodic solution, and temperature is to affect its corrosion
Topmost factor.As Figure 3-Figure 4.Therefore when corrosion evaluation is carried out to nickel-base alloy, on the basis of simulated condition
The upper temperature for raising test environment, can so reflect corrosion resistant alloy long service performance, according to this understanding, the present invention
By on the basis of simulated field working condition, improving test environment temperature, so as to reach carbon steel material corrosion process is accelerated
Experiment purpose.
Specific implementation step is as follows：
1st, prepare gas field scene extraction aqueous solution (to be matched somebody with somebody in Oil Field stratum water ratio with analytical reagent and deionized water
System), during empirically aequum (amount of sample is crossed at energy end) adds high-temperature high-pressure reaction kettle；
2nd, (autoclave band heat riser), (simulation of simulated field ambient parameter on the basis of ambient temperature conditions are improved
Temperature and H2S/CO2Partial pressure and with the presence or absence of sulfur deposition), contain H High Temperature High Pressure is high2S/CO2Under environment carry out corrosion coupon and
Stress corrosion etc. is studied.
Above-mentioned experimental technique overcomes the evaluation methodology of traditional simple simulation field working conditions condition can not meet assessment material
The shortcoming of long service behavior at the scene, is that the laboratory research of system and the material corrosion evaluated in high sour gas well environment are carried
A kind of effective way is supplied.
(2) Corrosion Evaluation system
It is an object of the invention to provide a set of high sour gas well tubing and casing material evaluation and preferred model and software.With
Corrosion prediction and assessment are carried out for high sour gas well oil jacket tube material, for high sour gas well High Temperature High Pressure is high H is contained2S/CO2Deng
Practical problem and the model that designs and software, for high sour gas well risk management effective technical support is provided.The present invention is wanted
The problem of solution is current material assessment and optimization model and software cannot meet the material corrosion prediction of high sour gas well scene and
Evaluate preferred demand.
In order to realize foregoing invention purpose, the technical scheme of employing is as follows：
High sour gas well Corrosion Evaluation system, including corrosion rate forecast model and stress corrosion cracking boundary model, with
And a set of Corrosion Evaluation software, corrosion rate forecast model and stress corrosion cracking boundary model are tested by the inventive method
Existing Data Summary is obtained in the mass data for obtaining and document.Corrosion rate forecast model is by setting up varying environment
Under the conditions of corrosion rate chart board, can to acid gas field typical case material corrosion rate be predicted analysis；Stress corrosion is opened
Boundary model is split according to temperature and H2The change of S partial pressures, for typical nickel-bass alloy material under high sour gas well environment material
Stress corrosion cracking behavior carried out partition management, pass determines the Failure Boundaries of stress corrosion cracking, Corrosion Evaluation software
Based on corrosion prediction model, with reference to high sour gas well Field Production Data and corrosion-monitoring data, can be in peracidity gas
Critical material military service safety evaluation and preferably is quickly and accurately carried out at field scene, while being realized to peace using Risk Management Framework
Certain assosting effect is played in the full extension evaluated and support, the formulation and improvement to production technology scheme.What the present invention was adopted
Software system interface is directly perceived, and flexible operation, succinct, extensibility are strong.
(corrosion rate predicts that chart board and stress corrosion cracking boundary model are a large amount of to the corrosion rate prediction chart board
Summarize what is obtained on the basis of data in literature and experimental data.Wherein a stress corrosion cracking model part employs international standard
IS015156 results) it is according to High Temperature High Pressure H2S/CO2Corrosion experiment result is strong to typical drilling-production equipment material P110SS, solid solution
Change nickel-base alloy G3,825 establish H2S partial pressures-temperature, H2S partial pressure-CO2The corrosion rate prognostic chart of partial pressure and simple substance S-pH values
Plate (as shown in Figure 5-Figure 7).Using the chart board, can be according to ambient parameter (such as temperature, H2S partial pressures, CO2Partial pressure, elemental sulfur contain
Amount, pH etc.) determine that material corrosion rate in the present context is interval, and then understand the material suitability in this context, it is rotten
Erosion rate prediction chart board can provide believable reference frame based on substantial amounts of test data for the selection of acid-soluble oil field.
The stress corrosion cracking boundary model is on the basis of conventional model, according to High Temperature High Pressure H2S/CO2Corrosion is real
Result is tested, it is determined that in temperature and H2Failure Boundaries under S partial pressure conditions, further define in addition after Sulfur releasing material in temperature and H2S
Failure Boundaries under partial pressure conditions, the model for nickel-base alloy G3,825,028 3 kind of material.
Fig. 8 is the contraction Failure Boundaries of the temperature that data are obtained in the presence of element-free sulfur and hydrogen sulfide sectional pressure, wherein 0th area is
Interval applicatory under any other environmental conditions specified in iso standard, i.e., less than 149 DEG C any hydrogen sulfide sectional pressures, 218
2kPa hydrogen sulfide sectional pressures below DEG C.1 area border major part is determined that, in the area, G3 is closed by laboratory by substantial amounts of experimentation
Do not ftracture the cracks can spread that yet do not occur in golden 30 days, shows that the area is comparatively safe.2nd area are then based on document and conventional all kinds of tests
The synthesis result of data, different due to being related to test method and other environmental conditions, the area is although existing test shows
G3 did not ftractureed in 30 days or determines there is anti-SCC abilities according to SSR tests, but when being evaluated, it is still necessary to further specially
Door verification experimental verification its safety.3rd area have exceeded the critical temperature given in document, therefore the area due to lacking test data
For unacceptable interval.
Fig. 9 is the contraction Failure Boundaries of the temperature and hydrogen sulfide sectional pressure obtained based on data in the presence of elementary sulfur.0th area is
Interval applicatory under any other environmental conditions specified in iso standard, i.e., less than 149 DEG C any hydrogen sulfide sectional pressures.1st area
Border is contracted to 180 DEG C according to result of the test, and area's result of the test is when there is elementary sulfur, and alloy does not ftracture not in 30 days yet
Generation cracks can spread, shows that the area is comparatively safe.2 area's outer boundaries are contracted to 0.7MPa H2S and 204 DEG C, the area is in sulfur content
There is spot corrosion risk during rising, need further verification experimental verification.3rd area are still unacceptable interval.
The corrosion evaluation software system includes basic data library module, safety evaluation knowledge module, corrosion prediction analysis
Module and risk management module.
Wherein, basic data library module includes field basic data, field monitoring data, indoor experimental data and data
Management system；
Safety evaluation knowledge module includes H2S/CO2Corrosion prediction model, high sour gas well corrosion failure case, Gao Han
H2S/CO2Corrosion field related science document etc..
Corrosion prediction analysis module according to selected high sour gas well scene material and environmental aspect, using the corruption set up
Erosion evaluation model, evaluates material corrosive nature in this context and stress corrosion cracking risk；
Risk management module includes risk Source Analysis, risk factor management, risk Metrics analysis and quantitative risk analysis
Deng four submodules.
The interface that the software is used primarily as model, by being input into simple parameter, you can by background model meter
Calculation obtain the material suitability under this condition, so as to reach the purpose of optimizing pipe string. its excess-three item include field basic data,
Safety evaluation knowledge and risk management module provide basic data, the theoretical reference as material when preferred, figure for researcher
10 is that software evaluation system constitutes structure chart.
Embodiment：
Certain gas field is due to a point acid separator maintenance so that acidifying solution enters gathering line.Analyzed and researched using methods described
Show：In the presence of corrosion inhibiter, the corrosion rate of carbon steel tubing is between 0.04-0.09.Belong to slight erosion.Actual motion
Measurement corrosion rate is 0.058.This plays facilitation to the gas field trial throw product.
The shaft column optimization of material method is applied to the selection of high sour gas well material and combination is preferred, overbased acidic
Gas field different materials are analyzed contrast, according to corrosion regularity and galvanic corrosion feature, it is recommended to use downhole temperature is higher than 100
Degree selects G3 compo pipes, and 028 compo pipe can be selected less than 100 degree, realizes that tubing string optimization of material is combined, per ton to save 60,000
Unit, every mouthful of well can reduce 3,000,000 yuan of expense, and whole oil field development expense can reduce more than 100,000,000 yuan.Guarantee is corrosion proof simultaneously, Jing
Ji considerable benefit.
It is anti-that the shaft column optimization of material method is also applied to certain nickel-base alloy G3 tubing production domesticization project, certain height simultaneously
Sulfur wellhead assembly production domesticization project, the multiple tube technological project of certain cast tube.Wherein G3 tubing production domesticization causes then external tubing
Price is reduced to 480,000 yuan/ton by 620,000 yuan/ton, and it is 240,000 yuan/ton that recently Germany W＆M even more offers.Suppress external monopoly price
Produce great economic benefit.Also the critical equipment application to apply under high Sulphur Contaminated Environment provides technical support.
It is of the invention to contain for height for a kind of high sour gas well shaft column material optimizing evaluation system, more particularly to one kind
H2S/CO2The shaft column material optimizing evaluation method of gas field environmental quality design, including high sour gas well flow of fluid rule prison
Survey unit, wellbore materials corrosion evaluation unit and Corrosion Evaluation predicting unit.From ambient parameter analysis, corrosion evaluation method and
The aspect of corrosion prediction three carries out system evaluation and preferably, and the material optimizing evaluation system of the present invention can be used in High Temperature High Pressure height and contain
H2S/CO2Material corrosion evaluation under severe rugged environment and preferably, use range is wider, also relatively reliable.The invention solves height and contains
H2S/CO2Gas field lacks the difficulty of foundation because lacking targetedly corrosion simulated evaluation methodology and corrosion prediction model and software, selection
Topic, develops for high sour gas well and safety in production provides theory support.
With deepening continuously for acid gas field development process, the exploitation share of high sour gas well is increasing, domestic external demand
The natural gas well for carrying out material selection and corrosion prediction for high sour gas well environment can be more and more, therefore the invention is at home
Wide application prospect is respectively provided with outward.
Above-mentioned technical proposal is one embodiment of the present invention, for those skilled in the art, at this
On the basis of disclosure of the invention application process and principle, it is easy to make various types of improvement or deformation, this is not limited solely to
The method described by above-mentioned specific embodiment is invented, therefore previously described mode is simply preferred, and do not have and limit
The meaning of property.
Claims (3)
1. a kind of high sour gas well shaft column material of utilization high sour gas well shaft column material optimizing evaluation system is preferred
Evaluation methodology, it is characterised in that：The system includes corrosion rate forecast model and stress corrosion cracking boundary model；
The corrosion rate forecast model includes H2S partial pressures-temperature, H2S partial pressure-CO2The corrosion of partial pressure and simple substance S-pH values
Rate prediction chart board；
The stress corrosion cracking boundary model includes material in temperature and H2After Failure Boundaries and Sulfur releasing under S partial pressure conditions
Material is in temperature and H2Failure Boundaries under S partial pressure conditions；
Methods described includes：
Determine environmental condition and parameter；
In high H2Speeding-up simulation test is carried out to the material corrosion performance of nickel-base alloy tubing and casing under S partial pressure conditions；
In high H2Speeding-up simulation test is carried out to the corrosive nature of carbon steel oil jacket tube material under S partial pressure conditions；
It is described to determine what environmental condition and parameter were realized in：In analysis along the change of pit shaft each component, sulfur deposition, change of flow state
And under conditions of heat loss, high gas field containing H2S/CO2 pit shaft multiphase flow law forecasting model is set up, the forecast model includes
Comprehensive pressure-drop model, thermograde model and sulfur deposition forecast model；
It is described in high H2It is so to carry out speeding-up simulation test to the material corrosion performance of nickel-base alloy tubing and casing under S partial pressure conditions
Realize：
1st, live gas field extraction aqueous solution is prepared, empirically aequum is added in high-temperature high-pressure reaction kettle；
2nd, in the pH value for ensureing with the solution is adjusted on the basis of work condition environment identical temperature and pressure value, test environment is made
Reach maximum and ooze hydrogen saturation conditions；
3rd, it is high containing H in High Temperature High Pressure according to site environment parameter2S/CO2Carry out grinding for corrosion coupon and stress corrosion under environment
Study carefully.
2. high sour gas well shaft column material optimizing evaluation method according to claim 1, it is characterised in that：It is described
High H2What speeding-up simulation test was realized in is carried out to the corrosive nature of carbon steel oil jacket tube material under S partial pressure conditions：
1st, gas field scene extraction aqueous solution is prepared, empirically aequum is added in high-temperature high-pressure reaction kettle；
2nd, it is high containing H in High Temperature High Pressure according to site environment parameter on the basis of ambient temperature conditions are improved2S/CO2Under environment
Carry out the research of corrosion coupon and stress corrosion.
3. high sour gas well shaft column material optimizing evaluation method according to claim 1, it is characterised in that：The height
Containing H2S/CO2What environment was realized in：
1st, H is utilized at room temperature2S gas cylinders are passed through H in the high-temperature high-pressure reaction kettle of sealing2S gases；
2nd, H is treated2S fully dissolves, and when the dial gauge of high-temperature high-pressure reaction kettle shows pressure drop, H is passed through again2S gases；
3rd, H is repeated2S is passed through-dissolves-this cyclic process is passed through again so as to and dissolving reaches determination amount；
4th, heat temperature raising, makes H2S partial pressures reach the H for specifying2S partial pressure conditions；
5th, with gas cylinder directly by CO2Closed high-temperature high-pressure reaction kettle is passed through, is reached and is stopped after setting pressure.
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| CN107179275B (en) * | 2017-07-01 | 2019-05-17 | 西南石油大学 | A kind of gas injection well selection boundary determines method |
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| CN108256237B (en) * | 2018-01-22 | 2024-06-28 | 中国石油化工股份有限公司 | Four-way safety evaluation calculation method for wellhead tubing head containing crack defects |
| CN111798131B (en) * | 2020-07-06 | 2024-05-03 | 陕西延长石油（集团）有限责任公司 | Carbon dioxide flooding injection and production system safety risk monitoring method |
| CN112507582A (en) * | 2020-11-23 | 2021-03-16 | 广东石油化工学院 | Method and device for predicting pipeline under-scale corrosion in oil refinery tank field |
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