CN112182487A - Method for obtaining dissolved oxygen corrosion rate of water injection well pipe column - Google Patents

Method for obtaining dissolved oxygen corrosion rate of water injection well pipe column Download PDF

Info

Publication number
CN112182487A
CN112182487A CN202011081980.4A CN202011081980A CN112182487A CN 112182487 A CN112182487 A CN 112182487A CN 202011081980 A CN202011081980 A CN 202011081980A CN 112182487 A CN112182487 A CN 112182487A
Authority
CN
China
Prior art keywords
water injection
well
dissolved oxygen
water
pipe column
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202011081980.4A
Other languages
Chinese (zh)
Other versions
CN112182487B (en
Inventor
许红林
杨斌
龙学渊
彭念
徐家年
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chongqing University of Science and Technology
Original Assignee
Chongqing University of Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chongqing University of Science and Technology filed Critical Chongqing University of Science and Technology
Priority to CN202011081980.4A priority Critical patent/CN112182487B/en
Publication of CN112182487A publication Critical patent/CN112182487A/en
Application granted granted Critical
Publication of CN112182487B publication Critical patent/CN112182487B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/11—Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/08—Thermal analysis or thermal optimisation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Analysis (AREA)
  • Computational Mathematics (AREA)
  • Pure & Applied Mathematics (AREA)
  • Mining & Mineral Resources (AREA)
  • Data Mining & Analysis (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Operations Research (AREA)
  • Computer Hardware Design (AREA)
  • Evolutionary Computation (AREA)
  • Geometry (AREA)
  • Geophysics (AREA)
  • Software Systems (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Databases & Information Systems (AREA)
  • Algebra (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)

Abstract

Based on the viscous fluid mechanics boundary layer theory, the thickness and the oxygen corrosion diffusion coefficient of an injected water dissolved oxygen corrosion diffusion boundary layer in a full-well pipe column are obtained by utilizing parameters of a temperature field, a pressure field and a water injection working condition of a well shaft of a water injection well; then, based on a diffusion control mechanism of corrosion of injected water dissolved oxygen to the underground pipe column, calculating the dissolved oxygen concentration distribution in the underground long-distance closed water injection pipe column by adopting a recursion method, wherein the dissolved oxygen concentration distribution is considered to be corroded; and finally, calculating the dissolved oxygen corrosion rate distribution of the whole shaft pipe column of the water injection well based on the corrosion electrochemical theory. The invention has the beneficial effects that: compared with the existing method for researching the dissolved oxygen corrosion rate and the law of the water injection well pipe column by adopting an experimental method, the method provided by the invention can quickly and economically obtain the dissolved oxygen corrosion rate distribution considering corrosion consumption in the water injection well full-well-tube closed pipe column, and has high reliability.

Description

Method for obtaining dissolved oxygen corrosion rate of water injection well pipe column
Technical Field
The invention belongs to the technical field of integrity and safety of a shaft pipe column of a water injection well, and particularly relates to a method for acquiring the dissolved oxygen corrosion rate of the pipe column of the water injection well.
Background
The water injection is one of the main ways for improving the recovery ratio of the oil field, and because the injected water has high dissolved oxygen content, high mineralization degree, large water injection displacement and high underground high temperature and high pressure, the underground water injection pipe column is seriously corroded by the dissolved oxygen after long-term water injection operation, so that the failure of the pipe column occurs occasionally, the well repair period is shortened, and the overall benefits of long-term safe production of a shaft of the water injection well and water injection development of the oil field are seriously restricted. Therefore, reliable prediction of the distribution of the dissolved oxygen corrosion rate of the underground water injection pipe column has important significance for evaluating the safety risk of the pipe column, formulating safety control measures and improving the integrity of the shaft of the water injection well.
At present, the oxygen corrosion behavior of the underground pipe column under water injection working condition parameters is simulated mainly through an in-practice experiment method, the influence rule of factors such as pressure, dissolved oxygen content, temperature, mineralization degree, flow rate and corrosion inhibitor on the corrosion rate of pipe columns made of different materials is researched, and the oxygen corrosion mechanism and rule of the pipe column are revealed by combining with corrosion product characterization means such as a Scanning Electron Microscope (SEM), an energy spectrometer (EDS) and an XRD diffractometer. However, due to the limitation of experiment cost and time, the experiment method usually only carries out the oxygen corrosion simulation aiming at the set limited set of experiment parameters, and the oxygen corrosion rate distribution of the whole shaft pipe column cannot be obtained. Meanwhile, the existing experimental device is difficult to simulate the dissolved oxygen corrosion behavior of the water injection well in a sealed pipe column of hundreds to thousands of meters under the well in consideration of corrosion consumption.
Disclosure of Invention
The invention aims to provide a method for rapidly, economically and reliably acquiring the dissolved oxygen corrosion rate of a water injection well pipe column.
The invention provides a method for obtaining the dissolved oxygen corrosion rate of a water injection well pipe column, which comprises the following steps,
the method comprises the following steps: testing the concentration C of the injected water dissolved oxygen at the wellhead by adopting a dissolved oxygen concentration testeraq(0) Or, alternatively, adoptThe following formula obtains Caq(0)
Figure BDA0002718854660000021
In the formula, Caq(0) The unit of the concentration of oxygen dissolved in water injected into a well mouth is mol/m3，pgrdMeasured as the ground pressure in kPa, TgrdThe measured temperature unit of the ground is;
step two: calculating and obtaining the kinematic viscosity v of the injected water by adopting the following formulaw(h)
Figure BDA0002718854660000022
In the formula, h is any well depth unit m, vw(h) The unit of the kinematic viscosity of the injected water at the well depth h is m2T (h) is the temperature of the injection water at the well depth h in units of DEG C, and p (h) is the pressure of the injection water at the well depth h in units of MPa; cwThe unit of total mineralization of injected water is 104mg/L；
Step three: calculating and obtaining Reynolds number Re (h) of injected water by adopting the following formula
Figure BDA0002718854660000023
In the formula, Re(h) Reynolds number, R, of water injected into well at depth he(h) Dimensionless, QwThe daily discharge capacity of the injected water is m3/d，Dout(h) The outer diameter unit of the cross section of the water injection channel at the well depth h is m and Din(h) The diameter unit of the cross section of the water injection channel at the well depth h is m;
step four: calculating to obtain the thickness (h) of the oxygen corrosion diffusion boundary layer of the water injection well pipe column by adopting the following formula
Figure BDA0002718854660000024
In the formula: (h) at a well depth h, O2The unit of the thickness of the diffusion boundary layer is m, and the unit of k (h) is the roughness of the pipe wall of the water injection pipe column at the well depth h;
step five: calculating and obtaining oxygen corrosion diffusion coefficient Do of water injection well pipe column by adopting formula2(h)
Figure BDA0002718854660000031
In the formula, Do2(h) The unit of the diffusion coefficient of the oxygen dissolved by the injected water at the well depth h is m2/s；
Step six: equally dividing the length H of the water injection well pipe column into N units with the length delta H along the well depth, wherein the length delta H is H/N, and obtaining the concentration C of the injected water dissolved oxygen at any well depth by recursion calculation by adopting the following formulaaq(h)
Figure BDA0002718854660000032
(wherein i is 1,2,3, … N and N > H)
In the formula: h is the total length unit of the water injection well pipe column m, N is the number of the equally-divided units of the pipe column along the well depth water injection well, N is an integer, delta H is the length unit of the equally-divided units of the pipe column along the well depth water injection well m, and tau is the well depth tau O2The thickness unit of the diffusion boundary layer is m, Dout(tau) is the unit of the outer diameter of the cross section of the water injection channel at the well depth tau is m, Din(tau) is the diameter unit in the cross section of the water injection channel at the well depth tau is m;
step seven: calculating and obtaining the dissolved oxygen corrosion rate R of the water injection well pipe column by adopting the following formulac(h)
Figure BDA0002718854660000033
In the formula, Rc(h) The unit of the dissolved oxygen corrosion rate of a water injection well pipe column at the well depth h is mm/y, MFeIs the molecular weight of iron, ρFeIs the density of iron.
Further, the stepsIn the fourth step, if the water injection pipe column is made of carbon steel, k (h) is 15.24 multiplied by 10-6m, if the water injection pipe column is made of alloy steel, k (h) is 1.6 multiplied by 10-6m。
Further, in the seventh step, MFeThe value is 0.056kg/mol, rhoFeThe value is 7850kg/m3。
Specific embodiments of the present application are disclosed in detail with reference to the following description and the accompanying drawings, which specify the manner in which parameters of the present application are calculated. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.
The invention has the beneficial effects that: compared with the existing method for researching the dissolved oxygen corrosion rate and the law of the water injection well pipe column by adopting an experimental method, the method provided by the invention can quickly and economically obtain the dissolved oxygen corrosion rate distribution considering corrosion consumption in the water injection well full-well-tube closed pipe column, and has high reliability.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is to be expressly understood that the drawings described below are only illustrative of some embodiments of the invention.
FIG. 1 shows the water injection well temperature field T (h) profile.
FIG. 2 shows the pressure field p (h) distribution of the water injection well.
FIG. 3 injection water kinetic viscosity vw(h) And (4) distribution.
FIG. 4 Reynolds number Re (h) distribution of injected water.
FIG. 5 is a distribution of oxygen corrosion diffusion boundary layer thickness (h) for water injection well string.
FIG. 6 oxygen corrosion diffusion coefficient Do of water injection well pipe column2(h) And (4) distribution.
FIG. 7 concentration C of dissolved oxygen in injected wateraq(h) And (4) distribution.
FIG. 8 dissolved oxygen corrosion rate R of water injection well stringc(h) And (4) distribution.
FIG. 9 is a flow chart of the dissolved oxygen corrosion rate prediction for a water injection well string.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments.
The invention provides a method for obtaining a dissolved oxygen corrosion rate of a water injection well pipe column, and belongs to the technical field of integrity and safety of a well pipe column of a water injection well. Because the underground pipe column of the water injection well is seriously corroded by the dissolved oxygen of the injected water, the failure of the pipe column is caused to happen occasionally, and the well repairing period is shortened, so that the reliable prediction of the distribution of the dissolved oxygen corrosion rate of the underground water injection pipe column is of great importance. At present, a laboratory simulation experiment method is mainly adopted for the research of the oxygen corrosion behavior of the underground pipe column, but the oxygen corrosion simulation is usually carried out only aiming at a limited set of experiment parameters due to the limitation of experiment cost and time, and the oxygen corrosion rate distribution of the whole shaft pipe column cannot be obtained. Meanwhile, the existing experimental device is difficult to simulate the dissolved oxygen corrosion behavior of the water injection well in a sealed pipe column of hundreds to thousands of meters under the well in consideration of corrosion consumption. The method comprises the steps of firstly, based on a viscous fluid mechanics boundary layer theory, obtaining the thickness and the oxygen corrosion diffusion coefficient of an injected water dissolved oxygen corrosion diffusion boundary layer in a full-well pipe column by utilizing parameters of a temperature field, a pressure field and a water injection working condition of a water injection well shaft; then, based on a diffusion control mechanism of corrosion of injected water dissolved oxygen to the underground pipe column, calculating the dissolved oxygen concentration distribution in the underground long-distance closed water injection pipe column by adopting a recursion method, wherein the dissolved oxygen concentration distribution is considered to be corroded; and finally, calculating the dissolved oxygen corrosion rate distribution of the whole shaft pipe column of the water injection well based on the corrosion electrochemical theory. Compared with the existing method for researching the dissolved oxygen corrosion rate and law of the water injection well pipe column by adopting an experimental method, the method can quickly and economically obtain the dissolved oxygen corrosion rate distribution considering corrosion consumption in the full-well-tube closed pipe column of the water injection well, and has high reliability.
As shown in fig. 9, the present invention provides a method for obtaining the dissolved oxygen corrosion rate of a water injection well string, comprising the following steps,
the method comprises the following steps: obtaining pgrd、Tgrd、Caq(0) In which C isaq(0) The method can be actually measured by a dissolved oxygen concentration tester, and can be estimated by the following formula if the injected water is not subjected to surface closed deoxygenation.
Figure BDA0002718854660000061
In the formula: caq(0) The concentration of oxygen dissolved in water is injected into the well mouth3；pgrdMeasuring the atmospheric pressure, kPa, on the ground; t isgrdMeasured temperature on ground, DEG C.
Step two: obtaining T (h), p (h), CwThe kinetic viscosity v of the injected water is obtained by the following formulaw(h)
Figure BDA0002718854660000062
In the formula: h is any well depth, m; v isw(h) The dynamic viscosity m of water injected into the well depth h2S; t (h) is the temperature of injected water at the well depth h, DEG C; p (h) is the injection water pressure at the well depth h, MPa; cwFor total degree of mineralization of the injected water, 104mg/L。
Step three: obtaining Qw、Dout(h)、Din(h) Obtaining the Reynolds number Re (h) of the injected water by using a formula
Figure BDA0002718854660000063
In the formula: re(h) The Reynolds number of the injected water at the well depth h is zero; qwFor the daily discharge of injected water, m3/d；Dout(h) The diameter m of the cross section of the water injection channel at the well depth h; din(h) The diameter m of the cross section of the water injection channel at the well depth h.
Step four: obtaining k (h), and obtaining the thickness (h) of the oxygen corrosion diffusion boundary layer of the water injection well pipe column by using the following formula
Figure BDA0002718854660000064
In the formula: (h) at a well depth h, O2Diffusion boundary layer thickness, m; k (h) is the roughness of the pipe wall of the water injection pipe column at the well depth h, and the carbon steel pipe column is 15.24 multiplied by 10-6m, taking 1.6 multiplied by 10 tubular columns made of alloy steel materials-6m。
Step five: the oxygen corrosion diffusion coefficient Do of the water injection well pipe column is obtained by the following formula2(h)
Figure BDA0002718854660000071
In the formula: do2(h) is the diffusion coefficient of water dissolved oxygen injected at well depth h, m2/s。
Step six: h, N and delta H are obtained, the length H of the water injection well pipe column is equally divided into N units with the length delta H along the well depth (the delta H is H/N), and the concentration C of the dissolved oxygen of the injected water at any well depth is obtained by the following formulaaq(h)
Figure BDA0002718854660000072
In the formula: h is the total length of the water injection well pipe column, m; n is the number of the pipe columns of the water injection well along the well depth in equal parts and is an integer; and delta h is the length of the pipe column of the water injection well along the well depth in equal units, m.
Step seven: obtaining MFe、ρFeObtaining the dissolved oxygen corrosion rate R of the water injection well pipe column by using the following formulac(h)
Figure BDA0002718854660000073
In the formula: rc(h) The corrosion rate of dissolved oxygen of the water injection well pipe column at the well depth h is mm/y; mFe-molecular weight of iron, 0.056 kg/mol; rhoFeDensity of iron, 7850kg/m3。
In the above step pgrd、Tgrd、Cw、QwEach value is obtained by field measurement; caq(0) The oxygen removal method can be obtained through field measurement, and can also be obtained through calculation if the ground closed oxygen removal is not carried out on the injected water; the values of T (h), p (h) are obtained by calculating water injection working condition parameters; dout(h)、Din(h)、k(h)、H、MFe、ρFeEach value can be obtained by looking up related technical data; the values of N and Δ h may be selected as appropriate.
Example one
The process of obtaining the dissolved oxygen corrosion rate of a water injection well string according to the present invention is illustrated by way of a specific example.
The ground actual measurement atmospheric pressure of a certain water injection well is 90.5kPa, the ground actual measurement temperature is 3 ℃, and the total mineralization degree of the injected water is 22 multiplied by 104mg/L, daily discharge of injected water is 100m3D; calculating a shaft temperature field (figure 1) and a pressure field (figure 2) according to water injection working condition parameters; the water injection mode obtained by looking up the related technical data is that the water is injected into the oil pipe, the outer diameter of the cross section of the water injection channel is 0.076m, the inner diameter of the cross section of the water injection channel is 0m, the water injection pipe column is made of carbon steel, the roughness of the pipe wall is 15.24 multiplied by 10-6m, total length of water injection well pipe column is 3000m, molecular weight of iron is 0.056kg/mol, density of iron is 7850kg/m3(ii) a The water injection well pipe column is equally divided into 3000 units along the well depth, and the length of each unit is 1 m.
The method comprises the following steps: the surface dissolved oxygen concentration was estimated to be 0.378mol/m from the formula (1)3(12.1mg/L)。
Step two: as shown in fig. 3, the kinematic viscosity of the injected water was calculated from equation (2).
Step three: as shown in fig. 4, the injected water reynolds number is calculated from equation (3).
Step four: as shown in fig. 5, the thickness of the oxygen corrosion diffusion boundary layer of the injection well string was calculated from equation (4).
Step five: as shown in fig. 6, the water injection well string oxygen corrosion diffusion coefficient was calculated from equation (5).
Step six: as shown in fig. 7, the concentration of injected water-soluble oxygen at an arbitrary well depth is calculated from equation (6).
Step seven: as shown in fig. 8, the water injection well string dissolved oxygen corrosion rate was calculated from equation (7).
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (3)

1.一种获取注水井管柱溶解氧腐蚀速率的方法，其特征在于，包括如下步骤，1. a method for obtaining the dissolved oxygen corrosion rate of water injection well pipe string, is characterized in that, comprises the steps, 步骤一：采用溶解氧浓度测定仪测试井口处注入水溶解氧浓度Caq(0)，或者，采用以下公式获取Caq(0)Step 1: Use a dissolved oxygen concentration tester to test the dissolved oxygen concentration Caq (0) of the injected water at the wellhead, or use the following formula to obtain Caq (0)
Figure FDA0002718854650000011
Figure FDA0002718854650000011
 式中，Caq(0)为井口处注入水溶解氧浓度单位为mol/m3，pgrd为地面实测大气压单位为kPa，Tgrd为地面实测温度单位为℃；In the formula, Caq (0) is the dissolved oxygen concentration of the injected water at the wellhead, in mol/m 3 , p grd is the measured atmospheric pressure on the ground, in kPa, and T grd is the measured temperature on the ground, in °C; 步骤二：采用以下公式计算获取注入水运动粘度νw(h)Step 2: Calculate the kinematic viscosity of injected water ν w (h) using the following formula
Figure FDA0002718854650000012
Figure FDA0002718854650000012
 式中，h为任意井深单位为m，νw(h)为井深h处注入水运动粘度单位为m2/s，T(h)为井深h处注入水温度单位为℃，p(h)为井深h处注入水压力单位为MPa；Cw为注入水总矿化度单位为104mg/L；In the formula, h is any well depth in m, ν w (h) is the kinematic viscosity of the injected water at the well depth h, the unit is m 2 /s, T(h) is the injected water temperature at the well depth h, the unit is °C, and p(h) is the injection water pressure at the well depth h, the unit is MPa; C w is the total salinity of the injected water, the unit is 10 4 mg/L; 步骤三：采用以下公式计算获取注入水雷诺数Re(h)Step 3: Use the following formula to calculate and obtain the injected water Reynolds number Re(h)
Figure FDA0002718854650000013
Figure FDA0002718854650000013
 式中，Re(h)为井深h处注入水雷诺数，Re(h)无因次，Qw为注入水日排量单位为m3/d，Dout(h)为井深h处注水通道横截面外直径单位为m，Din(h)为井深h处注水通道横截面内直径单位为m；In the formula, Re (h) is the Reynolds number of injected water at the well depth h, Re (h) is dimensionless, Q w is the daily displacement of injected water in m 3 /d, and D out (h) is the well depth h The unit of the outer diameter of the cross section of the water injection channel is m, and D in (h) is the inner diameter of the cross section of the water injection channel at the well depth h, and the unit is m; 步骤四：采用下公式计算获取注水井管柱氧腐蚀扩散边界层厚度δ(h)Step 4: Calculate and obtain the oxygen corrosion diffusion boundary layer thickness δ(h) of the water injection well tubing string using the following formula
Figure FDA0002718854650000021
Figure FDA0002718854650000021
 式中,δ(h)为井深h处O2扩散边界层厚度单位为m，k(h)单位为井深h处注水管柱管壁粗糙度；In the formula, δ(h) is the thickness of the O 2 diffusion boundary layer at the well depth h, in m, and k(h) is the wall roughness of the water injection string at the well depth h; 步骤五：采用公式计算获取注水井管柱氧腐蚀扩散系数Do2(h)Step 5: Use the formula to calculate the oxygen corrosion diffusion coefficient Do 2 (h) of the water injection well string
Figure FDA0002718854650000022
Figure FDA0002718854650000022
 式中，Do2(h)为井深h处注入水溶解氧扩散系数单位为m2/s；In the formula, Do 2 (h) is the dissolved oxygen diffusion coefficient of injected water at the depth h of the well, and the unit is m 2 /s; 步骤六：将注水井管柱长度H沿井深等分成N个长度为Δh的单元，Δh＝H/N，采用以下公式递推计算获取任意井深处注入水溶解氧浓度Caq(h)Step 6: Divide the pipe string length H of the water injection well into N equal units of Δh along the well depth, Δh=H/N, and use the following formula to recursively calculate the dissolved oxygen concentration of injected water at any well depth C aq (h)
Figure FDA0002718854650000023
Figure FDA0002718854650000023
 (其中，i＝1,2,3,…N且N＞H)(where i=1,2,3,...N and N>H) 式中，H为注水井管柱总长度单位为m，N为沿井深注水井管柱等分单元个数，N为整数，Δh为沿井深注水井管柱等分单元长度单位为m，δ(τ)为井深τ处O2扩散边界层厚度单位为m，Dout(τ)为井深τ处注水通道横截面外直径单位为m，Din(τ)为井深τ处注水通道横截面内直径单位为m；In the formula, H is the total length of the water injection well pipe string in m, N is the number of equally divided units of the water injection well pipe string along the depth of the well, N is an integer, Δh is the length of the equally divided unit of the water injection well pipe string along the depth of the well, in m, δ (τ) is the thickness of the O 2 diffusion boundary layer at the well depth τ, in m, D out (τ) is the outer diameter of the water injection channel cross-section at the well depth τ, in m, and D in (τ) is the inner diameter of the water injection channel at the well depth τ. The unit of diameter is m; 步骤七：采用以下公式计算获取注水井管柱溶解氧腐蚀速率Rc(h)Step 7: Use the following formula to calculate and obtain the dissolved oxygen corrosion rate R c (h) of the water injection well string
Figure FDA0002718854650000024
Figure FDA0002718854650000024
 式中，Rc(h)为井深h处注水井管柱溶解氧腐蚀速率单位为mm/y，MFe为铁的分子量，ρFe为铁的密度。In the formula, R c (h) is the dissolved oxygen corrosion rate of the water injection well string at the depth h, in mm/y, M Fe is the molecular weight of iron, and ρ Fe is the density of iron. 2.如权利要求1所述的一种获取注水井管柱溶解氧腐蚀速率的方法，其特征在于，2. A method for obtaining the dissolved oxygen corrosion rate of a water injection well pipe string as claimed in claim 1, characterized in that, 所述步骤四中，若注水管柱为碳钢材质则k(h)取15.24×10-6m，若注水管柱为为合金钢材质则k(h)取1.6×10-6m。In the fourth step, if the water injection pipe string is made of carbon steel, k(h) is taken as 15.24×10 -6 m, and if the water injection pipe string is made of alloy steel, k(h) is taken as 1.6×10 -6 m. 3.如权利要求1所述的一种获取注水井管柱溶解氧腐蚀速率的方法，其特征在于，3. a kind of method for obtaining the dissolved oxygen corrosion rate of water injection well pipe string as claimed in claim 1, is characterized in that, 所述步骤七中，MFe取值0.056kg/mol，ρFe取值7850kg/m3。In the seventh step, the value of M Fe is 0.056kg/mol, and the value of ρ Fe is 7850kg/m 3 .
CN202011081980.4A 2020-10-12 2020-10-12 A method for obtaining dissolved oxygen corrosion rate of water injection well pipe string Active CN112182487B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011081980.4A CN112182487B (en) 2020-10-12 2020-10-12 A method for obtaining dissolved oxygen corrosion rate of water injection well pipe string

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011081980.4A CN112182487B (en) 2020-10-12 2020-10-12 A method for obtaining dissolved oxygen corrosion rate of water injection well pipe string

Publications (2)

Publication Number Publication Date
CN112182487A true CN112182487A (en) 2021-01-05
CN112182487B CN112182487B (en) 2021-07-13

Family

ID=73949146

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011081980.4A Active CN112182487B (en) 2020-10-12 2020-10-12 A method for obtaining dissolved oxygen corrosion rate of water injection well pipe string

Country Status (1)

Country Link
CN (1) CN112182487B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113669049A (en) * 2021-08-24 2021-11-19 重庆科技学院 Application method of water injection well full-well tube column dissolved oxygen corrosion simulation device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070114024A1 (en) * 2005-11-18 2007-05-24 Daniels Vernon D Anti-oxidizing process for non-cryogenic nitrogen
CN105352880A (en) * 2015-12-11 2016-02-24 中国石油化工股份有限公司 Monitoring device and monitoring method for detecting downhole corrosion situation
CN106021659A (en) * 2016-05-10 2016-10-12 中国石油天然气股份有限公司 Method for determining corrosion rate of natural gas injection and production well pipe column under erosion-carbon dioxide corrosion coupling effect
CN107502328A (en) * 2017-09-27 2017-12-22 中国石油集团川庆钻探工程有限公司工程技术研究院 The acid de-plugging agent and preparation method of oil-water well fixed tubular column sulfate scale

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070114024A1 (en) * 2005-11-18 2007-05-24 Daniels Vernon D Anti-oxidizing process for non-cryogenic nitrogen
CN105352880A (en) * 2015-12-11 2016-02-24 中国石油化工股份有限公司 Monitoring device and monitoring method for detecting downhole corrosion situation
CN106021659A (en) * 2016-05-10 2016-10-12 中国石油天然气股份有限公司 Method for determining corrosion rate of natural gas injection and production well pipe column under erosion-carbon dioxide corrosion coupling effect
CN107502328A (en) * 2017-09-27 2017-12-22 中国石油集团川庆钻探工程有限公司工程技术研究院 The acid de-plugging agent and preparation method of oil-water well fixed tubular column sulfate scale

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113669049A (en) * 2021-08-24 2021-11-19 重庆科技学院 Application method of water injection well full-well tube column dissolved oxygen corrosion simulation device
CN113669049B (en) * 2021-08-24 2022-03-08 重庆科技学院 Application method of water injection well full-well tube column dissolved oxygen corrosion simulation device

Also Published As

Publication number Publication date
CN112182487B (en) 2021-07-13

Similar Documents

Publication Publication Date Title
CN107525733B (en) Wellhead downhole corrosion rate correlation model algorithm and downhole corrosion rate online monitoring method using same
CN109632510B (en) A method for predicting the strength of hydration-damaged shale
CN111042797B (en) A simulation and evaluation system for oil and gas wellbore corrosion
CN112302606B (en) A method for inversion and interpretation of production profiles of fracturing horizontal wells in low-permeability gas reservoirs
US10732086B2 (en) Device and method for measuring magnitude of seepage force and its influence on effective stress of formation
CN109033504B (en) Oil-water well casing damage prediction method
Nor et al. Corrosion of carbon steel in high CO2 environment: flow effect
CN107462936A (en) Utilize the method for pressure monitoring Data Inversion low permeability reservoir non-Darcy percolation law
CN105352880A (en) Monitoring device and monitoring method for detecting downhole corrosion situation
CN108133086A (en) Water Fractured Gas Wells fracture half-length's inversion method is produced in a kind of stress sensitive reservoir
CN217332081U (en) CO in rock chemical corrosion environment 2 Triaxial seepage test system
CN104405368B (en) Gas well at HTHP well-head pressure-measuring method for distinguishing adaptability
CN112182487B (en) A method for obtaining dissolved oxygen corrosion rate of water injection well pipe string
CN101710021B (en) Detection device of physical property of natural gas supercritical flow state
Gao et al. Corrosion behavior of the expandable tubular in formation water
CN114595504B (en) A method for inversion and interpretation of production profiles of fractured horizontal wells in shale gas reservoirs
CN110954462B (en) Evaluation method for equivalent permeability of cement stone along the corrosion direction after CO2 corrosion
CN107975356B (en) Oilfield gas injection pressure prediction method
Su et al. Experimental study of hydromechanical behavior of fracture of Vaca Muerta Gas Shale
CN114397228B (en) Method for evaluating long-term migration performance of polymer for oil displacement in stratum
Zhang et al. Anti-corrosion study of tungsten alloy coating on tube column under high CO2 partial pressure
Tummala et al. Effect of sand production and flow velocity on corrosion inhibition under scale forming conditions
Dong et al. An Improved Pressure Drop Prediction Model Based on Okiszewski's Model for Low Gas-liquid Ratio Two-Phase Upward Flow in Vertical Pipe.
CN112179832A (en) Indoor simulation experiment device and method for dynamic erosion corrosion of carbon dioxide to cement
Wang et al. Evaluation of erosion-corrosion behavior of N80 steel under high velocity wet gas condition

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant