CN114705580A - Evaluation method and device for erosion-corrosion coupling failure of sand control screen pipe of deepwater gas well - Google Patents

Evaluation method and device for erosion-corrosion coupling failure of sand control screen pipe of deepwater gas well Download PDF

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CN114705580A
CN114705580A CN202210317148.2A CN202210317148A CN114705580A CN 114705580 A CN114705580 A CN 114705580A CN 202210317148 A CN202210317148 A CN 202210317148A CN 114705580 A CN114705580 A CN 114705580A
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erosion
corrosion
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control screen
sand
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李中
邱浩
文敏
幸雪松
侯泽宁
黄辉
马楠
张锐
王俊豪
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Beijing Research Center of CNOOC China Ltd
CNOOC China Ltd
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Abstract

The invention relates to an erosion-corrosion coupling failure evaluation method for a sand control screen pipe of a deepwater gas well, which comprises the following steps of: determining an experimental method, wherein the experimental method comprises corrosion, erosion and erosion-corrosion coupling experiments to obtain the erosion-corrosion coupling rate and temperature, and CO2The relationship among various factors of partial pressure, flow rate, particle size and sand content; according to the erosion-corrosion coupling rate and temperature, CO in the experiment2The relationship of each factor of partial pressure, flow velocity, grain diameter and sand content is verified through the relationship between the single erosion model and the factor relationship, and then the relationship between the single factor and the erosion-erosion coupling rate is obtained; building sand control screen pipe at different temperatures and CO2Partial pressure, flow rate, particle diameterAnd a sand content erosion-corrosion coupling rate prediction model; and introducing the critical damage thickness of the sand control screen pipe as a failure criterion of the sand control screen pipe, and further establishing an erosion-corrosion loss evaluation method of the sand control screen pipe. The invention can carry out coupling research on erosion and corrosion research of the sand control screen pipe.

Description

Evaluation method and device for erosion-corrosion coupling failure of sand control screen pipe of deepwater gas well
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to an erosion-corrosion coupling failure evaluation method for a sand control screen pipe of a deep water gas well.
Background
The deepwater stratum has low compaction degree, loose cementation and easy sand production, and the deepwater gas well has high production allocation, high airflow velocity and serious erosion of the sand control screen pipe. If acid gases such as gas associated with CO2 and the like are produced, CO2 is corroded to reduce the strength of the pipe and promote erosion abrasion, the erosion causes surface corrosion products to be separated and aggravated, the surface corrosion products and the surface corrosion products are mutually coupled and superposed to accelerate the sand prevention failure of the sieve pipe, so that a series of hazards are caused, such as the erosion corrosion of a downhole pipe column and ground equipment, the increase of downhole operation times and the like, and even the production stop of a gas well is caused in severe cases.
At present, the research on the erosion corrosion problem at home and abroad is a single erosion research and a single corrosion research, and no related coupled research exists. Generally, corrosion rate prediction models are classified into 3 types at home and abroad, namely a semi-empirical prediction model, an empirical prediction model and a mechanism prediction model. On the establishment of a semi-empirical model, Waard provides a representative De Waard prediction model, and factors such as flow rate, pH value and oil film are continuously improved and corrected in the next decades; in the aspect of an empirical model, a Norsok corrosion empirical model established by Norwegian energy science and technology research according to a large amount of low-temperature indoor experimental data and high-temperature field data is taken as a representative, and the Norsok corrosion empirical model can be used for predicting the uniform corrosion rate of a material, but when the material has local irregular conditions (such as pitting corrosion and plateau-shaped corrosion), the prediction result is often lower than the actual condition; in the aspect of mechanism model, Nesic et al propose a kinetic model of CO2 corrosion, and consider single-phase chemical reaction and ion exchange of metal surface film formation. Most of the corrosion models are static corrosion models, and the influence of the flow velocity on the corrosion is not considered. In the aspect of erosion research, the erosion and wear theories researched at home and abroad have the greatest influence on the micro-cutting theory, the deformation and wear theory, the indentation fracture model theory and the like. In the actual erosion and abrasion process, various erosion actions are performed, and a single theory cannot be used for explanation. Wherein the micro-cutting theory, the deformation wear theory and the forging extrusion theory mainly consider the erosion wear of the fluid flow rate to the material, and do not consider the erosion wear of the multiphase flow to the material; the indentation fracture model theory is based on an erosion model provided by a micro-cutting theory, and the two-phase flow solid particle erosion model is established by mainly considering the influence of particle mass flow, flow rate and particle diameter on erosion.
Therefore, the real-time accurate control of the erosion-corrosion coupling rule and degree of the sieve tube and the prejudgment of the service life of the sieve tube have important significance for ensuring the safe and efficient development of ocean oil and gas resources.
Disclosure of Invention
Aiming at the problems, the invention aims to provide an erosion-corrosion coupling failure evaluation method for a sand control screen pipe of a deepwater gas well, which can be used for carrying out coupling research on erosion and corrosion research of the sand control screen pipe.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses an erosion-corrosion coupling failure evaluation method for a sand control screen pipe of a deep water gas well, which comprises the following steps of:
determining an experimental method comprising corrosionAnd carrying out erosion and erosion-corrosion coupling experiments to obtain the erosion-corrosion coupling rate and temperature and CO2The relationship among various factors of partial pressure, flow rate, particle size and sand content;
erosion-Corrosion coupling Rate and temperature, CO according to the above experiments2The relationship of each factor of partial pressure, flow velocity, particle size and sand content is verified through the relationship between the single erosion model and the factor relationship, and then the relationship between the single factor and the erosion-erosion coupling rate is obtained;
according to the relation between the single factor and the erosion-corrosion coupling rate, the sand control screen pipe is established at different temperatures and CO2A partial pressure, flow rate, particle size and sand content erosion-corrosion coupling rate prediction model;
according to different temperature and CO of the sand control screen pipe2And introducing the critical damage thickness of the sand control screen pipe as a failure criterion of the sand control screen pipe to establish an erosion-corrosion loss evaluation method of the sand control screen pipe.
The evaluation method for the erosion-corrosion coupling failure of the sand control screen pipe of the deepwater gas well preferably comprises the following steps of:
determining an experimental scheme of corrosion, erosion and erosion-corrosion coupling experiments, wherein the experimental scheme comprises a three-factor four-level corrosion experiment, a three-factor four-level erosion experiment and a five-factor four-level erosion-corrosion coupling experiment, and obtaining a mass loss value of a sample by performing an experiment on a screen hanging piece sample;
determining the equivalent liquid flow velocity relationship of the gas flow velocity according to the quantitative relationship between the sand flow velocity and the flow velocity of the experimental fluid medium in the Salama multi-phase flow model, and converting the liquid flow velocity into the gas flow velocity;
calculating the surface area A of the hanging piece of the screen, calculating the quality representation of the loss rate of the sample according to the mass loss value of the sample, and calculating the loss rate V of the screencor-eroIs characterized by the depth of the sieve loss rate Vcor-eroThe depth characterization of the etching is the erosion-corrosion coupling rate;
the rotary differential erosion-corrosion simulation experiment device is used for carrying out experiments to obtain the erosion-corrosionCorrosion coupling rate and temperature, CO2The relationship among various factors such as partial pressure, flow rate, particle size and sand content.
According to the evaluation method for the erosion-corrosion coupling failure of the sand control screen pipe of the deepwater gas well, preferably, the equivalent liquid flow rate relationship of the gas flow rate is as follows:
Figure BDA0003570164830000021
in the formula, VlApparent velocity of corrosive medium; vgIs the superficial velocity of natural gas; rholIs the density of the corrosive medium; rhogIs natural gas density; mu.slThe viscosity of the corrosive medium; mu.sgIs the viscosity of natural gas.
Preferably, the evaluation method for the erosion-corrosion coupling failure of the sand control screen pipe of the deepwater gas well calculates the surface area A of the screen hanging piece through a formula (2):
Figure BDA0003570164830000022
in the formula, A is the surface area of the screen hanging piece; n is1The number of the warp threads; d is the width of the screen cloth hanging piece; l is a radical of an alcohol1Is the length of the warp; n is2The number of the weft threads is; d is the diameter of the filament; l is2Is the weft length; l is the pitch of the warp holes; and c is the thickness of the screen hanging piece.
The method for evaluating the erosion-corrosion coupling failure of the sand control screen pipe of the deepwater gas well preferably comprises the step of evaluating the screen loss rate Vcor-eroThe depth characterization calculation method comprises the following steps:
the quality characterization for calculating the sample loss rate by equation (3) is:
Figure BDA0003570164830000031
in the formula, V-Is the sample loss rate; m is0Is the initial weight of the sample; m is1The weight of the sample after removal of the erosion-corrosion products; a. the0The surface area of the sample is the same as the surface area A of the screen hanging piece; t is the experimental time;
calculating the screen loss rate V by the formula (4)cor-eroIs characterized by:
Figure BDA0003570164830000032
in the formula, Vcor-eroIs the screen loss rate; ρ is the density of the sample.
According to the method for evaluating the erosion-corrosion coupling failure of the sand control screen pipe of the deepwater gas well, preferably, the relation between a single factor and the erosion-corrosion coupling rate is as follows:
temperature: vcor-ero∝eb/T
CO2Partial pressure:
Figure BDA0003570164830000034
flow rate: vcor-ero∝vx
Particle size: vcor-ero∝Iy
Sand content: vcor-ero∝wz
In the formula, Vcor-eroFor erosion-corrosion rate, T is temperature; pCo2Is CO2Partial pressure; v is the flow rate of the etching medium; w is the sand content; i is the grain size of sand grains; b, z, y and x are respectively related coefficients.
The evaluation method for erosion-corrosion coupling failure of the sand control screen pipe of the deepwater gas well preferably establishes the CO coupling failure of the sand control screen pipe at different temperatures2The method of the erosion-corrosion coupling rate prediction model of partial pressure, flow velocity, grain diameter and sand content comprises the following steps:
putting the sand control screen pipe into the sand control screen pipe at different temperatures and CO2The model for predicting the erosion-corrosion rate of partial pressure, flow velocity, particle size and sand content is as follows:
Figure BDA0003570164830000033
in the formula, Vcor-eroThe erosion-corrosion rate of the sand control screen pipe is the same as the loss rate of the screen; v is the flow rate of the corrosive medium; p isCO2Is CO2Partial pressure; w is the sand content; i is the grain size of sand grains; b, z, y and x are respectively correlation coefficients;
determining undetermined coefficients by utilizing multivariate linear regression analysis; established consideration of temperature, CO2The model for predicting the erosion-corrosion coupling rate influenced by partial pressure, flow velocity, particle size and sand content is as follows:
Figure BDA0003570164830000041
preferably, the critical damage thickness of the sand control screen is introduced as a sand control screen failure criterion, and the method for establishing the sand control screen erosion-corrosion loss evaluation method comprises the following steps:
based on an erosion-corrosion coupling rate prediction model of the sand control screen, introducing 40% of the critical damage thickness of the screen as a failure criterion of the sand control screen, and establishing the erosion-corrosion life prediction model of the sand control screen as follows:
Figure BDA0003570164830000042
in the formula, T is the predicted service life of the sand control screen pipe; c0Taking the thickness of the screen to be 40% of the critical damage thickness of the screen; vcor-eroIs the screen loss rate; f is the number of layers of the screen mesh; r is a damage time coefficient of screen blockage, is related to the blockage of stratum sand to the screen in the actual production process, and is generally 70-80 percent.
The invention also provides a device for evaluating the erosion-corrosion coupling failure of the sand control screen pipe of the deepwater gas well, which comprises the following components:
a first processing unit for determining experimental methods including corrosion, erosion and erosion-corrosion coupling experiments to obtain erosion-corrosion coupling rate and temperature, CO2Partial pressure, flow rate, particle size and sand contentThe relationship of (1);
a second processing unit for processing the CO according to the erosion-corrosion coupling rate and temperature in the above experiment2The relationship of each factor of partial pressure, flow velocity, grain diameter and sand content is verified through the relationship between the single erosion model and the factor relationship, and then the relationship between the single factor and the erosion-erosion coupling rate is obtained;
a third processing unit for establishing the sand control screen pipe at different temperatures and CO according to the relation between the single factor and the erosion-corrosion coupling rate2A partial pressure, flow rate, particle size and sand content erosion-corrosion coupling rate prediction model;
a fourth processing unit for controlling CO at different temperatures according to the sand control screen2And introducing the critical damage thickness of the sand control screen pipe as a failure criterion of the sand control screen pipe to establish an erosion-corrosion loss evaluation method of the sand control screen pipe.
The invention also provides a computer storage medium, which stores a computer program, and the computer program is executed by a processor to realize the steps of the evaluation method for the erosion-corrosion coupling failure of the deepwater gas well sand control screen pipe.
Due to the adoption of the technical scheme, the invention has the following advantages:
according to the invention, through an experimental method and by constructing a sand control screen pipe erosion-corrosion coupling rate model and combining with a corresponding influence rule, the erosion-corrosion coupling loss condition of the sand control screen pipe of the deepwater gas well under different sand production and production conditions can be accurately controlled;
the invention solves the problem that the mutual coupling effect is not considered in the current erosion and corrosion research of the sand control screen, establishes an erosion-corrosion coupling rate prediction model considering the influence of CO2 partial pressure, temperature, flow rate, sand content and sand grain size, further carries out the optimization of the sand control screen of the deepwater gas well and the service life prediction of the sand control screen, and provides a research method and a theoretical basis for the two.
Drawings
FIG. 1 is a schematic structural diagram of a rotary differential erosion corrosion simulation experiment device;
fig. 2 is a schematic structural diagram of a screen hanging piece model.
The figures are numbered:
1-a reaction kettle; 2-kettle cover; 3-an air intake device; 4-an air inlet pipeline; 5-an air outlet pipeline; 6-heating a belt; 7-a stirring member; 8, a motor; 9-a pressure gauge; 10-a thermometer; 11-screen hanging piece; 12-base card slot.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
The invention provides an erosion-corrosion coupling failure evaluation method for a sand control screen pipe of a deepwater gas well, which comprises the following steps of firstly determining an experiment method, wherein the experiment comprises corrosion, erosion and erosion-corrosion coupling experiments; then, researching the erosion-corrosion coupling rule of the sand control screen pipe, and establishing an erosion-corrosion coupling rate model of the sand control screen pipe; and then introducing critical damage thickness as a failure criterion of the sand control screen pipe to form an evaluation method for erosion-corrosion coupling loss of the sand control screen pipe of the deepwater gas well. The invention can carry out coupling research on erosion and corrosion research of the sand control screen pipe.
The invention provides an erosion-corrosion coupling failure evaluation method for a sand control screen pipe of a deepwater gas well, which comprises the following steps of:
1) determining an experimental method, wherein the experimental method comprises corrosion, erosion and erosion-corrosion coupling experiments to obtain the erosion-corrosion coupling rate and temperature, and CO2The relationship among various factors of partial pressure, flow rate, particle size and sand content;
specifically, the experimental method is as follows:
1.1) determining an experimental scheme of corrosion, erosion and erosion-corrosion coupling experiments, wherein the experimental scheme comprises a three-factor four-level corrosion experiment (CO2 partial pressure multiplied by temperature multiplied by flow rate), a three-factor four-level erosion experiment (sand content multiplied by sand grain size multiplied by flow rate) and a five-factor four-level erosion-corrosion coupling experiment, and the mass loss value of a sample is obtained by performing experiments on a screen hanging piece sample; wherein, the factors and the levels thereof are shown in the table 1:
TABLE 1 erosion Corrosion test factors and levels thereof
Figure BDA0003570164830000051
1.2) determining that the gas flow rate equivalent liquid flow rate relation is shown as formula 1 according to the quantitative relation between the sand flow rate and the experimental fluid medium flow rate in the Salama multiphase flow model, and converting the liquid flow rate into the gas flow rate:
Figure BDA0003570164830000061
in the formula, VlApparent velocity of the corrosive medium; vgIs the superficial velocity of natural gas; rholIs the density of the corrosive medium; ρ is a unit of a gradientgIs natural gas density; mu.slThe viscosity of the corrosive medium; mu.sgIs the viscosity of natural gas.
1.3) calculating the surface area A of the hanging piece of the screen, calculating the quality representation of the loss rate of the sample through the mass loss value of the sample and calculating the loss rate V of the screencor-eroIs characterized by the depth of the sieve loss rate Vcor-eroThe depth characterization of the etching is the erosion-corrosion coupling rate;
a. the method for calculating the surface area of the screen hanging piece comprises the following steps:
a 316L steel screen hanging piece is selected in the experiment, and the surface area of the hanging piece is calculated according to the shape of the hanging piece; the screen structure is woven for full-wrap twill, and the screen lacing film model is as shown in fig. 2, from this, calculate screen lacing film surface area a through equation (2):
Figure BDA0003570164830000062
in the formula, A is the surface area of the screen hanging piece; n is1The number of the warp threads; d is the width of the screen cloth hanging piece; l is1Is the length of the warp; n is a radical of an alkyl radical2The number of the weft threads is; d is the diameter of the filament; l is2Is weft lengthDegree; l is the pitch of the warp holes; and c is the thickness of the screen hanging piece.
b. Screen loss rate calculation method:
the quality characterization for calculating the sample loss rate by equation (3) is:
Figure BDA0003570164830000063
in the formula, V-Is the sample loss rate; m is0Is the initial weight of the sample; m is1The weight of the sample after removal of the erosion-corrosion products; a. the0The surface area of the sample is the same as the surface area A of the screen hanging piece; t is the experimental time;
calculating the screen loss rate V by the formula (4)cor-eroIs characterized by:
Figure BDA0003570164830000064
in the formula, Vcor-eroIs the screen loss rate; ρ is the density of the sample.
1.4) carrying out an experiment by using a rotary differential erosion-corrosion simulation experiment device to obtain the erosion-corrosion coupling rate, the temperature and CO2The relationship among various factors such as partial pressure, flow rate, particle size and sand content.
The rotary differential erosion-corrosion simulation experiment device is shown in figure 1, the top of a reaction kettle 1 is sealed through a kettle cover 2, an air inlet device 3 extends into the reaction kettle 1 from the kettle cover 2 through an air inlet pipeline 4 and is used for ventilating the reaction kettle, reacted gas flows out through an air outlet pipeline 5, heating belts 6 are arranged on two sides of the reaction kettle 1, a stirring piece 7 is further arranged in the reaction kettle 1, and the top of the stirring piece 7 penetrates through the kettle cover and is connected with a motor 8; the pressure gauge 9 and the thermometer 10 respectively extend into the reaction kettle 1, in the figure, a screen cloth hanging piece 11 is fixed through a hanging piece base clamping groove 12 arranged at the bottom of the reaction kettle, fluid stirring is carried out through electromagnetic coupling, and the high-speed rotation of blades drives sand grains in corrosive media to simulate the impact and erosion effects on the fixed hanging piece.
Step two:according to the erosion corrosion rate and temperature, CO in the above experiment2The relationship of each factor of partial pressure, flow velocity, grain diameter and sand content is verified through the relationship between the single erosion model and the factor relationship, and then the relationship between the single factor and the erosion-erosion coupling rate is obtained;
the experimental rules of various factors on the erosion-corrosion rate are obtained through experiments, the quantitative relation between the partial pressure, the temperature, the flow rate, the grain size and the sand content of CO2 and the erosion-corrosion coupling rate is analyzed according to the experimental rules of corrosion, erosion and erosion-corrosion coupling, and the relation between the obtained single factor and the erosion-corrosion coupling rate is shown in the table 2.
TABLE 2 Experimental relationship between erosion-Corrosion coupling Rate and factors
Figure BDA0003570164830000071
Wherein, Vcor-eroFor erosion-corrosion rate, T is temperature; pCO2Is CO2Partial pressure; v is the flow rate of the etching medium; w is the sand content; i is the grain size of sand grains; b, z, y and x are respectively correlation coefficients.
It should be noted that: the relationship between the loss rate and each factor in the traditional single-term model is as follows:
the corrosion rate of the traditional corrosion model is related to various factors:
and extracting the relation between the corrosion rate and each factor in the Norsok model, the De Waard model and the B.Mishra model. The corrosion rate in the conventional corrosion model is related to various factors as shown in table 3.
TABLE 3 Corrosion Rate in conventional Corrosion models
Figure BDA0003570164830000072
Figure BDA0003570164830000081
Secondly, the erosion rate of the traditional erosion model is related to various factors:
the relationship between the erosion rate and each factor in the deformation abrasion theory, the micro-cutting theory, the elasto-plastic indentation fracture theory and the forging and pressing theoretical model is extracted, and the relationship between the erosion rate and each factor in the traditional erosion model is shown in the table 4.
TABLE 4 relationship between erosion Rate and factors in conventional erosion model
Figure BDA0003570164830000082
Step three: building sand control screen pipe at different temperatures and CO2An erosion-corrosion coupling rate prediction model of partial pressure, flow velocity, particle size and sand content;
compared with the existing classical single erosion model and corrosion model and factor relation, the provided erosion corrosion rate prediction model of the sand control screen pipe at different temperatures, CO2 partial pressures, flow rates, particle sizes and sand contents is as follows:
Figure BDA0003570164830000083
in the formula, Vcor-eroThe erosion corrosion rate of the sieve tube is the same as the loss rate of the sieve; v is the flow rate of the corrosive medium; pCO2Is CO2Partial pressure; w is the sand content; i is the grain size of sand grains; b, z, y and x are respectively correlation coefficients;
determining undetermined coefficients by utilizing multivariate linear regression analysis; established considerations of temperature, CO2The model for predicting the erosion-corrosion coupling rate influenced by partial pressure, flow velocity, particle size and sand content is as follows:
Figure BDA0003570164830000084
step four: introducing the critical damage thickness of the sand control screen pipe as a failure criterion of the sand control screen pipe, and further establishing a sand control screen pipe erosion-corrosion loss evaluation method:
based on a screen pipe erosion-corrosion coupling rate model, 40% of the critical damage thickness of a screen is introduced as a failure criterion of the sand control screen, and the screen pipe erosion-corrosion life prediction model is established as follows:
Figure BDA0003570164830000085
in the formula, T is the predicted service life of the sand control screen pipe; c0Taking the thickness of the screen to be 40% of the critical damage thickness of the screen; vcor-eroIs the screen loss rate; f is the number of layers of the screen; r is a damage time coefficient of screen blockage, is related to the blockage of stratum sand to the screen in the actual production process, and is generally 70-80 percent.
Example 1:
the temperature of a gas field stratum is 80-93 ℃, the content of CO2 is 0.15-1.8%, the daily gas production is 30-193 m3, the density of a corrosive medium is 1048kg/m3, the kinematic viscosity is 1.01 mPa.s, the natural gas density is 0.7174kg/m3, the kinematic viscosity is 0.1 mPa.s, the sand density is 2650kg/m3, the material of a selected sieve screen is 316L stainless steel, the material density is 7.98g/cm3, and the sand blocking precision is 120 mu m. The critical damage thickness of the screen is set to be 0.48mm, which is 40% of the thickness of the screen, the number of screen layers is 2, and the damage time coefficient of screen blockage is 80%.
Combining the erosion corrosion rate prediction model to obtain the average erosion-corrosion coupling rate of the screen, and then calculating the service life of the screen according to the screen erosion-corrosion life prediction model, as shown in table 5:
TABLE 5 Screen life prediction for each production well
Figure BDA0003570164830000091
The invention also provides a device for evaluating the erosion-corrosion coupling failure of the sand control screen pipe of the deepwater gas well, which comprises the following components:
a first processing unit for determining experimental methods including corrosion, erosion and erosion-corrosion coupling experiments to obtain erosion-corrosion coupling rate and temperature, CO2Partial pressure, flow rate, particle diameter and compositionThe relationship of various factors of the sand amount;
a second processing unit for processing the CO according to the erosion-corrosion coupling rate and temperature in the above experiment2The relationship of each factor of partial pressure, flow velocity, particle size and sand content is verified through the relationship between the single erosion model and the factor relationship, and then the relationship between the single factor and the erosion-erosion coupling rate is obtained;
a third processing unit for establishing the sand control screen pipe at different temperatures and CO according to the relation between the single factor and the erosion-corrosion coupling rate2A partial pressure, flow rate, particle size and sand content erosion-corrosion coupling rate prediction model;
a fourth processing unit for controlling CO at different temperatures according to the sand control screen2And (3) an erosion-corrosion coupling rate prediction model of partial pressure, flow velocity, particle size and sand content is adopted, the critical damage thickness of the sand control screen pipe is introduced as a failure criterion of the sand control screen pipe, and then an erosion-corrosion loss evaluation method of the sand control screen pipe is established.
The invention also provides a computer storage medium, which stores a computer program, and the computer program is executed by a processor to realize the steps of the evaluation method for the erosion-corrosion coupling failure of the deepwater gas well sand control screen pipe.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. The method for evaluating the erosion-corrosion coupling failure of the sand control screen pipe of the deepwater gas well is characterized by comprising the following steps of:
determining an experimental method, wherein the experimental method comprises corrosion, erosion and erosion-corrosion coupling experiments to obtain the erosion-corrosion coupling rate and temperature, and CO2The relationship among various factors such as partial pressure, flow rate, particle size and sand content;
erosion-Corrosion coupling Rate and temperature, CO according to the above experiments2The relationship of each factor of partial pressure, flow velocity, grain diameter and sand content is verified through the relationship between the single erosion model and the factor relationship, and then the relationship between the single factor and the erosion-erosion coupling rate is obtained;
according to the relation between the single factor and the erosion-corrosion coupling rate, the sand control screen pipe is established at different temperatures and CO2A partial pressure, flow rate, particle size and sand content erosion-corrosion coupling rate prediction model;
according to different temperature and CO of the sand control screen pipe2And introducing the critical damage thickness of the sand control screen pipe as a failure criterion of the sand control screen pipe to establish an erosion-corrosion loss evaluation method of the sand control screen pipe.
2. The method for evaluating the erosive-corrosive coupling failure of the sand control screen of the deepwater gas well according to claim 1, wherein the determination experiment method comprises the following steps:
determining an experimental scheme of corrosion, erosion and erosion-corrosion coupling experiments, wherein the experimental scheme comprises a three-factor four-level corrosion experiment, a three-factor four-level erosion experiment and a five-factor four-level erosion-corrosion coupling experiment, and obtaining a mass loss value of a sample by performing an experiment on a screen hanging piece sample;
determining the equivalent liquid flow velocity relationship of the gas flow velocity according to the quantitative relationship between the sand flow velocity and the flow velocity of the experimental fluid medium in the Salama multi-phase flow model, and converting the liquid flow velocity into the gas flow velocity;
calculating the surface area A of the hanging piece of the screen, calculating the quality representation of the loss rate of the sample according to the mass loss value of the sample, and calculating the loss rate V of the screencor-eroIs characterized by the depth of the sieve loss rate Vcor-eroThe depth characterization of the etching is the erosion-corrosion coupling rate;
the screen cloth hanging piece sample is tested by using a rotary differential erosion-corrosion simulation experiment device to obtain an erosion-corrosion coupleResultant rate and temperature, CO2The relationship among various factors such as partial pressure, flow rate, particle size and sand content.
3. The method for evaluating the erosion-corrosion coupling failure of the sand control screen of the deepwater gas well according to claim 2, wherein the equivalent liquid flow rate relation of the gas flow rate is as follows:
Figure FDA0003570164820000011
in the formula, VlApparent velocity of corrosive medium; vgIs the superficial velocity of natural gas; rholIs the density of the corrosive medium; rhogIs natural gas density; mu.slThe viscosity of the corrosive medium; mu.sgIs the viscosity of natural gas.
4. The method for evaluating the erosion-corrosion coupling failure of the deepwater gas well sand control screen pipe according to claim 2, wherein the surface area A of the screen hanging piece is calculated by the formula (2):
Figure FDA0003570164820000021
in the formula, A is the surface area of the screen hanging piece; n is1The number of the warp threads; d is the width of the screen cloth hanging piece; l is1Is the length of the warp; n is2The number of the weft threads is; d is the diameter of the filament; l is2Is the weft length; l is the pitch of the warp holes; and c is the thickness of the screen hanging piece.
5. The method of evaluating the erosive-corrosive coupling failure of a sand control screen for a deepwater gas well according to claim 4, wherein the screen loss rate V iscor-eroThe depth characterization calculation method comprises the following steps:
the quality characterization for calculating the sample loss rate by equation (3) is:
Figure FDA0003570164820000022
in the formula, V-Is the sample loss rate; m is0Is the initial weight of the sample; m is1The weight of the sample after removal of the erosion-corrosion products; a. the0The surface area of the sample is the same as the surface area A of the screen hanging piece; t is the experimental time;
calculating the screen loss rate V by the formula (4)cor-eroIs characterized by:
Figure FDA0003570164820000023
in the formula, Vcor-eroIs the screen loss rate; ρ is the density of the sample.
6. The method for evaluating the erosion-corrosion coupling failure of the sand control screen of the deepwater gas well as recited in claim 5, wherein the relationship between the single factor and the erosion-corrosion coupling rate is as follows:
Figure FDA0003570164820000024
in the formula, Vcor-eroFor erosion-corrosion rate, T is temperature; pCO2Is CO2Partial pressure; v is the flow rate of the corrosive medium; w is the sand content; i is the grain size of sand grains; b, z, y and x are respectively correlation coefficients.
7. The method of evaluating erosion-corrosion coupling failure of a sand screen for a deepwater gas well as recited in claim 1, wherein the sand screen is established at different temperatures and CO2The method of the erosion-corrosion coupling rate prediction model of partial pressure, flow velocity, grain diameter and sand content comprises the following steps:
raising sand-proof sieve tube at different temp. and CO2The model for predicting the erosion-corrosion rate of the partial pressure, the flow velocity, the grain diameter and the sand content is as follows:
Figure FDA0003570164820000025
in the formula, Vcor-eroThe erosion-corrosion rate of the sand control screen pipe is the same as the loss rate of the screen; v is the flow rate of the corrosive medium; p isCO2Is CO2Partial pressure; w is the sand content; i is the grain size of sand grains; b, z, y and x are respectively correlation coefficients;
determining undetermined coefficients by utilizing multivariate linear regression analysis; established considerations of temperature, CO2The model for predicting the erosion-corrosion coupling rate influenced by partial pressure, flow velocity, particle size and sand content is as follows:
Figure FDA0003570164820000031
8. the method for evaluating the erosion-corrosion coupling failure of the sand control screen of the deepwater gas well as recited in claim 1, wherein the method for establishing the method for evaluating the erosion-corrosion loss of the sand control screen by introducing the critical damage thickness of the sand control screen as a failure criterion of the sand control screen comprises the following steps:
based on an erosion-corrosion coupling rate prediction model of the sand control screen, introducing 40% of the critical damage thickness of the screen as a failure criterion of the sand control screen, and establishing the erosion-corrosion life prediction model of the sand control screen as follows:
Figure FDA0003570164820000032
in the formula, T is the predicted service life of the sand control screen pipe; c0Taking the thickness of the screen to be 40% of the critical damage thickness of the screen; vcor-eroIs the screen loss rate; f is the number of layers of the screen; r is a damage time coefficient of screen blockage, is related to the blockage of stratum sand to the screen in the actual production process, and is generally 70-80 percent.
9. The utility model provides a deep water gas well sand control screen pipe erosion-corrosion coupling failure evaluation device which characterized in that includes:
a first processing unit for determining experimental methods including corrosion, erosion and erosion-corrosion coupling experiments to obtain erosion-corrosion coupling rate and temperature, CO2The relationship among various factors such as partial pressure, flow rate, particle size and sand content;
a second processing unit for processing the CO according to the erosion-corrosion coupling rate and temperature in the above experiment2The relationship of each factor of partial pressure, flow velocity, grain diameter and sand content is verified through the relationship between the single erosion model and the factor relationship, and then the relationship between the single factor and the erosion-erosion coupling rate is obtained;
a third processing unit for establishing the CO sand control screen pipe at different temperatures according to the relationship between the single factor and the erosion-corrosion coupling rate2An erosion-corrosion coupling rate prediction model of partial pressure, flow velocity, particle size and sand content;
a fourth processing unit for controlling CO at different temperatures according to the sand control screen2And (3) an erosion-corrosion coupling rate prediction model of partial pressure, flow velocity, particle size and sand content is adopted, the critical damage thickness of the sand control screen pipe is introduced as a failure criterion of the sand control screen pipe, and then an erosion-corrosion loss evaluation method of the sand control screen pipe is established.
10. A computer storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method steps of the method for evaluating erosion-corrosion coupling failure of a deepwater gas well sand control screen of any of claims 1 to 8.
CN202210317148.2A 2022-03-29 2022-03-29 Evaluation method and device for erosion-corrosion coupling failure of sand control screen pipe of deepwater gas well Pending CN114705580A (en)

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* Cited by examiner, † Cited by third party
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CN115290432A (en) * 2022-08-07 2022-11-04 西南石油大学 Perforation erosion rate prediction and erosion damage evaluation method for perforated casing

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115290432A (en) * 2022-08-07 2022-11-04 西南石油大学 Perforation erosion rate prediction and erosion damage evaluation method for perforated casing
CN115290432B (en) * 2022-08-07 2024-06-11 西南石油大学 Method for predicting erosion rate and evaluating erosion damage of perforation sleeve

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