CN112182487A - Method for obtaining dissolved oxygen corrosion rate of water injection well pipe column - Google Patents
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- 239000007924 injection Substances 0.000 title claims abstract description 105
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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
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)
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)
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
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
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)
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)
(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)
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.
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)
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
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
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)
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)
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)
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. A method for obtaining the dissolved oxygen corrosion rate of a water injection well pipe column is characterized by comprising 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, C is obtained by using the following formulaaq(0)
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)
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
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
Wherein (h) is the 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)
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)
(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 is m, and N is the equal division of the water injection well pipe column along the well depthThe number of units, N is an integer, delta h is the length unit of an equant unit of a pipe column of the water injection well along the well depth, and (tau) is the position O at the well depth tau2The 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)
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.
2. The method for obtaining the dissolved oxygen corrosion rate of a water injection well string according to claim 1,
in 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。
3. The method for obtaining the dissolved oxygen corrosion rate of a water injection well string according to claim 1,
in the seventh step, MFeThe value is 0.056kg/mol, rhoFeThe value is 7850kg/m3。
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