CN107179275A - A kind of gas injection well selection boundary determines method - Google Patents
A kind of gas injection well selection boundary determines method Download PDFInfo
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- CN107179275A CN107179275A CN201710528724.7A CN201710528724A CN107179275A CN 107179275 A CN107179275 A CN 107179275A CN 201710528724 A CN201710528724 A CN 201710528724A CN 107179275 A CN107179275 A CN 107179275A
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Abstract
Method is determined the invention discloses a kind of gas injection well selection boundary, belongs to Oil/gas Well field of corrosion prevention.It is characterized in that：Corrosion test is carried out under different operating modes to unlike material first with high temperature and high pressure kettle and uniform corrosion rate value is obtained, and then obtains the corrosion rate of material and the relation curve of duty parameter；Then, nonlinear fitting is carried out to the corrosion rate of material using least square method, and corresponding fitting formula under different corrosive conditions is obtained, the corrosion safety coefficient under different corrosive conditions is calculated further according to given corrosion security control index, and draw corresponding selection plate.The advantage of this method is, based on a small amount of laboratory experiment data, draws affecting laws of the different duty parameters to corrosion rate, and then set up the selection plate for considering many factors.
Description
Technical field
The present invention relates to gas injection well tubing string selection field, more particularly to a kind of gas injection well selection boundary determines method.
Background technology
At present, many oil reservoir developments of China have been enter into the middle and later periods, there is crude oil water content height, and input-output ratio is big, conventional
Water injection technology tap the latent power difficulty the problems such as.It is a kind of efficient raising that (such as carbon dioxide injection, air, nitrogen or natural gas) is driven in gas injection
Oil recovery factor technology.During injection gas displacement, the CO contained in injected media2、O2Tubing and casing can be caused Deng Korrosionsmedium
Corrosion, corrosion the wall thickness of tubing and casing can be caused thinning, when serious corrosion failure, or even pit shaft can be caused to scrap.Gas injection well casing
The quality of post decay resistance directly influences the safety of pit shaft.To ensure that the safety of different gas injection operating mode well-sinkings is on active service, oil
The selection of sleeve pipe seems particularly critical.
At present, for the research of oil well pipe selection boundary, " a kind of high sour gas well shaft column evaluation of material system "
(the number of applying for a patent：The A of CN 104251812) height is solved containing H2S/CO2Gas field selection problem, be high sour gas well exploitation and
Safety in production provides theories integration.A kind of " new tubing and casing carbon dioxide selection plate " (number of applying for a patent：
CN104726872 A), the plate covers different types of low Cr steel newly developed, compensate in the past only in carbon steel and stainless steel
Between carry out tubing and casing selection deficiency, reduce tubing and casing cost.However, above achievement in research needs to rely on substantial amounts of interior
Experimental data, experimental cost is higher.
Therefore, a kind of gas injection well selection boundary method easy, practical, that scene can be instructed is invented still very necessary
's.
The content of the invention
Method is determined it is an object of the invention to provide a kind of gas injection well selection boundary, to solve the choosing of gas injection well tubing and casing
Material problem, and simplify the process of gas injection well selection, save cost.
The present invention is that a kind of gas injection well selection boundary determines method, and described method detailed process comprises the following steps：
Step 1：Gas injection well unlike material is carried out under different temperatures, flow velocity, corrosive medium partial pressure and chlorine ion concentration
Weight-loss method corrosion test, and utilization corrosion rate formula (1) asks for the uniform corrosion rate value of material；
In formula：v′corFor corrosion rate (mm/a), Δ m is the difference (g) of the quality of sample before and after corrosion test, and ρ is sample
Density (g/cm), A is that specimen surface accumulates (cm2), Δ t is etching time (h)；
Step 2：Uniform corrosion rate value based on material in step 1 obtains the corrosion rate and temperature of unlike material respectively
Degree, flow velocity, the relation curve of corrosive medium partial pressure and chlorine ion concentration, and unlike material is fitted respectively using least square method
Corrosion rate and temperature, flow velocity, the formula of corrosive medium partial pressure and chlorine ion concentration, its formula is expressed as (2)-(5)；
vt=f (t) (2)
vp=f (p) (3)
vv=f (v) (4)
vc=f (c) (5)
In formula：vtObtained corrosion rate (mm/a), v are calculated by f (t) functions when for temperature being tpFor corrosive medium partial pressure
Obtained corrosion rate (mm/a), v are calculated by f (p) during for pvObtained corrosion rate (mm/ is calculated by f (v) when for flow velocity being v
A), vcObtained corrosion rate (mm/a) is calculated by f (c) when for chlorine ion concentration being c, t is temperature (DEG C), and p is corrosive medium
Partial pressure (MPa), v is flow velocity (m/s), and c is chlorine ion concentration (ppm)；
Step 3：According to given corrosion security control index S, the corrosion safety coefficient under different operating modes is calculated, it is public
Formula is expressed as (6)-(9)；
In formula：S is oil field corrosion control index, vtObtained corrosion rate is calculated by f (t) functions when for temperature being t
(mm/a), vpObtained corrosion rate (mm/a), v are calculated by f (p) when for corrosive medium partial pressure being pvBy f (v) when for flow velocity being v
Calculate obtained corrosion rate (mm/a), vcObtained corrosion rate (mm/a), n are calculated by f (c) when for chlorine ion concentration being ct
It is v for corrosion ratetWhen the corrosion safety coefficient that calculates, npIt is v for corrosion ratepWhen the corrosion safety coefficient that calculates, nvFor corruption
Erosion speed is nvWhen the corrosion safety coefficient that calculates, ncIt is v for corrosion ratecWhen the corrosion safety coefficient that calculates；
Step 4：Using safety coefficient formula (6)-(9) are corroded in step 3, calculate and obtain unlike material under different operating modes
Corrosion safety coefficient ni=[n1, n2, n3... nN], i represents to corrode the number of safety coefficient, i=1,2,3 ... N (N>15)；Step
Rapid 5：Using corrosive conditions parameter as the axis of abscissas of selection plate, corrosion safety coefficient is the axis of ordinates of selection plate, will be walked
Corrosion safety coefficient in rapid 4 is linked to be curve, draws out unlike material in temperature, corrosive medium partial pressure, flow velocity, chlorine ion concentration
Under the conditions of selection plate；
Step 6：According to temperature, corrosive medium partial pressure, flow velocity, the corresponding selection plate of chlorine ion concentration, according to gas injection well
Duty parameter, respectively obtain n in selection platet, np, nvWithAs corrosion safety coefficient nt, np, nvWithIt is all higher than
Material during equal to 1 meets the choice requirement of gas injection well, works as nt, np, nvWithIn any one material when being less than 1 then not
The choice requirement of gas injection well can be met.
Described selection boundary determines method while considering temperature, corrosive medium partial pressure, flow velocity and chlorine ion concentration four
The factor of kind.
Technical scheme of the present invention as a result of more than, with advantages below：
(1) corresponding selection plate can be all set up for the gas injection well of different specific operations, is the selection of gas injection well tubing string
Important evidence is provided.
(2) the selection boundary determines method based on a small amount of laboratory experiment data, therefore it sets up the process letter of selection plate
It is single.
Brief description of the drawings
Fig. 1 is selection plate of the unlike material under temperature conditionss.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
Fig. 1 is selection plate of the unlike material under temperature conditionss.
Step 1：Gas injection well unlike material is carried out under different temperatures, flow velocity, corrosive medium partial pressure and chlorine ion concentration
Weight-loss method corrosion test, and utilization corrosion rate formula (1) asks for the uniform corrosion rate value of material；
In formula：v′corFor corrosion rate (mm/a), Δ m is the difference (g) of the quality of sample before and after corrosion test, and ρ is sample
Density (g/cm), A is that specimen surface accumulates (cm2), Δ t is etching time (h)；
Step 2：Uniform corrosion rate value based on material in step 1 obtains the corrosion rate and temperature of unlike material respectively
Degree, flow velocity, the relation curve of corrosive medium partial pressure and chlorine ion concentration, and unlike material is fitted respectively using least square method
Corrosion rate and temperature, flow velocity, the formula of corrosive medium partial pressure and chlorine ion concentration, its formula is expressed as (2)-(5)；
vt=f (t) (2)
vp=f (p) (3)
vv=f (v) (4)
vc=f (c) (5)
In formula：vtObtained corrosion rate (mm/a), v are calculated by f (t) functions when for temperature being tpFor corrosive medium partial pressure
Obtained corrosion rate (mm/a), v are calculated by f (p) during for pvObtained corrosion rate (mm/ is calculated by f (v) when for flow velocity being v
A), vcObtained corrosion rate (mm/a) is calculated by f (c) when for chlorine ion concentration being c, t is temperature (DEG C), and p is corrosive medium
Partial pressure (MPa), v is flow velocity (m/s), and c is chlorine ion concentration (ppm)；
Step 3：According to given corrosion security control index S, the corrosion safety coefficient under different operating modes is calculated, it is public
Formula is expressed as (6)-(9)；
In formula：S is oil field corrosion control index, vtObtained corrosion rate is calculated by f (t) functions when for temperature being t
(mm/a), vpObtained corrosion rate (mm/a), v are calculated by f (p) when for corrosive medium partial pressure being pvBy f (v) when for flow velocity being v
Calculate obtained corrosion rate (mm/a), vcObtained corrosion rate (mm/a), n are calculated by f (c) when for chlorine ion concentration being ct
It is v for corrosion ratetWhen the corrosion safety coefficient that calculates, npIt is v for corrosion ratepWhen the corrosion safety coefficient that calculates, nvFor corruption
Erosion speed is vvWhen the corrosion safety coefficient that calculates, ncIt is v for corrosion ratecWhen the corrosion safety coefficient that calculates；
Step 4：Using safety coefficient formula (6)-(9) are corroded in step 3, calculate and obtain unlike material under different operating modes
Corrosion safety coefficient ni=[n1, n2, n3... nN], i represents to corrode the number of safety coefficient, i=1,2,3 ... N (N>15)；Step
Rapid 5：As shown in figure 1, using corrosive conditions parameter as the axis of abscissas of selection plate, corrosion safety coefficient is the vertical seat of selection plate
Parameter, is linked to be curve by the corrosion safety coefficient in step 4, draw out unlike material temperature, corrosive medium partial pressure, flow velocity,
Selection plate under the conditions of chlorine ion concentration；
Step 6：According to temperature, corrosive medium partial pressure, flow velocity, the corresponding selection plate of chlorine ion concentration, according to gas injection well
Duty parameter, respectively obtain n in selection platet, np, nvWithAs corrosion safety coefficient nt, np, nvWithIt is all higher than
Material during equal to 1 meets the choice requirement of gas injection well, works as nt, np, nvWithIn any one material when being less than 1 then not
The choice requirement of gas injection well can be met.
Described selection boundary determines method while considering temperature, corrosive medium partial pressure, flow velocity and chlorine ion concentration four
The factor of kind.
Claims (2)
1. a kind of gas injection well selection boundary determines method, it is characterised in that：Comprise the following steps：
Step 1：Weightlessness is carried out under different temperatures, flow velocity, corrosive medium partial pressure and chlorine ion concentration to gas injection well unlike material
Method corrosion test, and utilization corrosion rate formula (1) asks for the uniform corrosion rate value of material；
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In formula：v′corFor corrosion rate (mm/a), Δ m is the difference (g) of the quality of sample before and after corrosion test, and ρ is sample density
(g/cm), A is that specimen surface accumulates (cm2), Δ t is etching time (h)；
Step 2：Uniform corrosion rate value based on material in step 1 obtains the corrosion rate and temperature, stream of unlike material respectively
The relation curve of speed, corrosive medium partial pressure and chlorine ion concentration, and the corruption of unlike material is fitted using least square method respectively
Speed and the formula of temperature, flow velocity, corrosive medium partial pressure and chlorine ion concentration are lost, its formula is expressed as (2)-(5)；
vt=f (t) (2)
vp=f (p) (3)
vv=f (v) (4)
vc=f (c) (5)
In formula：vtObtained corrosion rate (mm/a), v are calculated by f (t) functions when for temperature being tpWhen for corrosive medium partial pressure being p
Obtained corrosion rate (mm/a), v are calculated by f (p)vObtained corrosion rate (mm/a), v are calculated by f (v) when for flow velocity being vc
Obtained corrosion rate (mm/a) is calculated by f (c) when for chlorine ion concentration being c, t is temperature (DEG C), and p is corrosive medium partial pressure
(MPa), v is flow velocity (m/s), and c is chlorine ion concentration (ppm)；
Step 3：According to given corrosion security control index S, the corrosion safety coefficient under different operating modes is calculated, its formula table
It is shown as (6)-(9)；
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In formula：S is oil field corrosion control index, vtObtained corrosion rate (mm/a) is calculated by f (t) functions when for temperature being t,
vpObtained corrosion rate (mm/a), v are calculated by f (p) when for corrosive medium partial pressure being pvCalculated when for flow velocity being v by f (v)
The corrosion rate (mm/a) arrived, vcObtained corrosion rate (mm/a), n are calculated by f (c) when for chlorine ion concentration being ctFor corrosion
Speed is vtWhen the corrosion safety coefficient that calculates, npIt is v for corrosion ratepWhen the corrosion safety coefficient that calculates, nvFor corrosion rate
For vvWhen the corrosion safety coefficient that calculates, ncIt is v for corrosion ratecWhen the corrosion safety coefficient that calculates；
Step 4：Using safety coefficient formula (6)-(9) are corroded in step 3, the corruption for obtaining unlike material under different operating modes is calculated
Lose safety coefficient ni=[n1, n2, n3... nN], i represents to corrode the number of safety coefficient, i=1,2,3 ... N (N>15)；
Step 5：Using corrosive conditions parameter as the axis of abscissas of selection plate, corrosion safety coefficient is the ordinate of selection plate
Axle, is linked to be curve by the corrosion safety coefficient in step 4, draws out unlike material in temperature, corrosive medium partial pressure, flow velocity, chlorine
Selection plate under the conditions of ion concentration；
Step 6：According to temperature, corrosive medium partial pressure, flow velocity, the corresponding selection plate of chlorine ion concentration, the work according to gas injection well
Condition parameter, n is respectively obtained in selection platet, np, nvWithAs corrosion safety coefficient nt, np, nvWithIt is all higher than being equal to 1
When material meet the choice requirement of gas injection well, work as nt, np, nvWithIn any one be less than 1 when material can not then expire
The choice requirement of sufficient gas injection well.
2. a kind of gas injection well selection boundary according to claim 1 determines method, it is characterised in that described selection boundary
Method is determined while considering temperature, corrosive medium partial pressure, flow velocity and chlorine ion concentration four factors.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108982348A (en) * | 2018-09-18 | 2018-12-11 | 广东电网有限责任公司 | Underground concrete structure steel corrodes Nondestructive device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8447529B2 (en) * | 2009-01-19 | 2013-05-21 | Bp Corporation North America Inc. | Method and system for predicting corrosion rates using mechanistic models |
| CN104251812A (en) * | 2013-06-27 | 2014-12-31 | 中国石油化工股份有限公司 | High-acidity gas field wellbore string material optimization evaluation system and method |
| CN104726872A (en) * | 2015-04-08 | 2015-06-24 | 中国石油大学(北京) | Novel oil sleeve carbon dioxide anti-corrosion material selection chart |
-
2017
- 2017-07-01 CN CN201710528724.7A patent/CN107179275B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8447529B2 (en) * | 2009-01-19 | 2013-05-21 | Bp Corporation North America Inc. | Method and system for predicting corrosion rates using mechanistic models |
| CN104251812A (en) * | 2013-06-27 | 2014-12-31 | 中国石油化工股份有限公司 | High-acidity gas field wellbore string material optimization evaluation system and method |
| CN104726872A (en) * | 2015-04-08 | 2015-06-24 | 中国石油大学(北京) | Novel oil sleeve carbon dioxide anti-corrosion material selection chart |
Non-Patent Citations (1)
| Title |
|---|
| 王文明 等: "酸性气体腐蚀环境油井管选材分析与评价", 《腐蚀与防护》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108982348A (en) * | 2018-09-18 | 2018-12-11 | 广东电网有限责任公司 | Underground concrete structure steel corrodes Nondestructive device |
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