CN113686765B - A Dissolved Oxygen Corrosion Simulation Device for Full Wellbore Pipe String in Water Injection Well - Google Patents
A Dissolved Oxygen Corrosion Simulation Device for Full Wellbore Pipe String in Water Injection Well Download PDFInfo
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Abstract
本发明提供一种模拟注水井全井筒管柱溶解氧腐蚀评价装置，包括储液立管，注空气系统，氮气加压系统，电加热系统，曝气循环系统，溶解氧监测系统，腐蚀反应循环系统，实验辅助控制系统；本发明的腐蚀评价方法通过建立注水过程中井深与实验时间的函数关系，结合腐蚀电化学理论通过一次实验数据计算注水井全井筒管柱溶解氧腐蚀速率，极大减少实验次数，显著降低实验时间和实验成本。
The invention provides a dissolved oxygen corrosion evaluation device for a simulated water injection well full wellbore string, including a liquid storage riser, an air injection system, a nitrogen pressurization system, an electric heating system, an aeration circulation system, a dissolved oxygen monitoring system, and a corrosion reaction cycle. system, an experimental auxiliary control system; the corrosion evaluation method of the present invention greatly reduces the dissolved oxygen corrosion rate of the whole wellbore string of the water injection well by establishing the functional relationship between the well depth and the experimental time in the water injection process, and combining the corrosion electrochemical theory with one experimental data. The number of experiments can significantly reduce the experiment time and experiment cost.
Description
Technical Field
The invention relates to the technical field of integrity and safety of a shaft pipe column of a water injection well, in particular to a dissolved oxygen corrosion simulation device for a full-well pipe column of the water injection well.
Background
The water injection development is a main method for improving the oil field recovery ratio, 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, after long-term water injection operation, an underground water injection pipe column is seriously corroded by the dissolved oxygen, so that the pipe column is occasionally failed, the well repairing period is shortened, and the safety of a well shaft of a water injection well and the overall benefit of the oil field water injection development are seriously influenced.
The water injection during water flooding is usually carried from the wellhead to the bottom of the well through a few hundred to several kilometers of closed pipe string and then injected into the formation, and the process takes about tens of minutes to several hours. As the injected water is continuously consumed due to the corrosion reaction between the dissolved oxygen in the water and the pipe column in the transportation process, and the temperature and the pressure of the shaft are continuously increased, the concentration of the dissolved oxygen in the injected water and the oxygen corrosion reaction rate are directly influenced, and finally the dissolved oxygen corrosion rate of the water injection pipe column along the well depth is continuously changed.
Because the stress of the water injection well pipe column is very complicated, the well depth of a point with serious stress of the pipe column is not consistent with the well depth of a point with serious corrosion of the pipe column, the specific position of the failure of the pipe column is very difficult to predict, and the failure well section and the risk of the failure well section of the pipe column can be accurately and reliably predicted on the basis of obtaining the corrosion distribution of the whole well pipe and the pipe column. Therefore, the method has important significance for evaluating the safety risk of the pipe column, making safety control measures and improving the integrity of the shaft of the water injection well by accurately simulating the dissolved oxygen corrosion behavior of the underground long-distance closed pipe column of the high-temperature and high-pressure 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 indoor experimental 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 the corrosion rule of the pipe column are revealed by combining 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 existing experimental device and method usually only perform oxygen corrosion simulation aiming at a limited set of selected experimental parameters, and obtain the corrosion rate of the pipe column subjected to dissolved oxygen under the condition of temperature and pressure at certain specific well depth. Meanwhile, the existing experimental device and method are difficult to simulate the dissolved oxygen corrosion behavior of the water injection well in a sealed pipe column with hundreds to thousands of meters underground and considering corrosion consumption.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a full-well tube column dissolved oxygen corrosion simulation device for a water injection well, which can simulate dissolved oxygen corrosion behavior of the water injection well in a sealed tube column of hundreds to thousands of meters under the well in consideration of corrosion consumption.
The purpose of the invention is realized as follows:
a full-well tube column dissolved oxygen corrosion simulation device of a water injection well,
the device comprises a liquid storage vertical pipe, wherein an annular partition plate is arranged on the upper part of an inner cavity of the liquid storage vertical pipe along the circumferential direction, the inner cavity of a pipe body of the liquid storage vertical pipe is divided into an upper cavity and a lower cavity by the annular partition plate, the lower cavity is used for containing a test solution, a pressurizing hole and an exhaust hole are formed in the wall of the upper cavity, and the pressurizing hole is connected with a nitrogen pressurizing system and is used for automatically pressurizing the test solution; the exhaust hole is connected with an exhaust pipeline, the top of the liquid storage vertical pipe is provided with an electric heating system for automatically heating a test solution, the bottom of the liquid storage vertical pipe is provided with an air inlet hole and a liquid inlet hole, the wall of the lower cavity is provided with a liquid outlet hole, the air inlet hole is connected with an air injection system for supplying oxygen to the test solution, the liquid inlet hole and the liquid outlet hole are connected with an aeration system and a corrosion reaction system, the aeration system is used for carrying out aeration treatment on the test solution, and the corrosion reaction system is used for carrying out corrosion reaction on the test solution and a corrosion experiment pipe section;
the nitrogen pressurization system comprises a high-pressure nitrogen bottle and a nitrogen injection pipeline which are connected with each other, the nitrogen injection pipeline is connected with a pressurization hole, a nitrogen pressure reducing valve, a pressure gauge and a nitrogen gas inlet valve are sequentially arranged on the nitrogen injection pipeline, the nitrogen pressure reducing valve and the pressure gauge are connected with a nitrogen pressure reducing valve controller, pressure-time data are arranged in the nitrogen pressure reducing valve controller, the nitrogen pressure reducing valve controller reads the data of the pressure gauge in real time and compares the data with preset experimental pressure-time data, and the opening degree of the nitrogen pressure reducing valve is fed back and adjusted to realize automatic pressurization of liquid in the liquid storage vertical pipe;
an exhaust valve is arranged on the exhaust pipeline, and the exhaust valve is a one-way valve;
the electric heating system comprises a heating rod and an electric heating controller, the heating rod penetrates through the annular partition plate downwards and is inserted into the test solution, a gap is reserved between the heating rod and the annular partition plate, and temperature-time data are arranged in the electric heating controller to realize automatic control of the temperature of the test solution in the liquid storage vertical pipe;
the aeration system comprises an upper horizontal pipe, a lower horizontal pipe and a vertical pipe connected with the outer connecting ends of the upper horizontal pipe and the lower horizontal pipe, wherein the inner connecting end of the upper horizontal pipe is connected with a liquid outlet, the inner connecting end of the lower horizontal pipe is connected with a liquid inlet to form an aeration circulating system, the corrosion reaction system comprises an upper L-shaped pipe, a corrosion experiment pipe section and a lower L-shaped pipe which are sequentially connected, the upper L-shaped pipe is connected with the outer connecting end of the upper horizontal pipe, the lower L-shaped pipe is connected with the outer connecting end of the lower horizontal pipe to form a corrosion reaction circulating system, the upper horizontal pipe is provided with an upper horizontal pipe liquid inlet valve and a dissolved oxygen detector, the dissolved oxygen detector is used for detecting the dissolved oxygen content of a test solution in the upper horizontal pipe, the vertical pipe is provided with a vertical pipe upper valve and a vertical pipe lower valve, and the upper flow direction of the lower horizontal pipe is sequentially provided with a liquid flow meter, a peristaltic pump and the lower flow meter, The system comprises a peristaltic pump, a liquid flowmeter, a peristaltic pump controller, an upper horizontal pipe liquid inlet valve, a lower vertical pipe liquid outlet valve, a lower horizontal pipe liquid inlet valve, a lower horizontal pipe liquid outlet valve and a corrosion test liquid outlet valve, wherein the peristaltic pump controller presets corrosion test liquid flow, the flow of the peristaltic pump is automatically controlled by the peristaltic pump controller, the upper horizontal pipe liquid inlet valve, the vertical pipe upper valve, the vertical pipe lower valve and the lower horizontal pipe liquid outlet valve are all one-way valves, an upper L-shaped pipe valve is arranged on the upper L-shaped pipe, a lower L-shaped pipe valve is arranged on the lower L-shaped pipe, and the upper L-shaped pipe valve and the lower L-shaped pipe valve are all one-way valves;
still include experiment auxiliary control system, experiment auxiliary control system includes computer, auxiliary control software, the computer with nitrogen gas pressure reduction valve controller, electric heating controller, dissolved oxygen detector, peristaltic pump controller are connected, realize programming the setting to required pressure-time data of experiment, temperature-time data, corrosion test liquid flow data through auxiliary control software, and the cooperation realizes carrying out automatic feedback control to experiment pressure, experiment temperature and experiment liquid flow, and the while automatic record dissolved oxygen detects the change condition of data along with the experiment time.
Preferably, the liquid storage vertical pipe is provided with a liquid storage vertical pipe body, the top of the liquid storage vertical pipe is a liquid storage vertical pipe upper cover, the bottom of the liquid storage vertical pipe is a liquid storage vertical pipe lower cover, and the liquid storage vertical pipe upper cover and the liquid storage vertical pipe lower cover are respectively in threaded sealing connection with the liquid storage vertical pipe body.
Preferably, the exhaust hole and the liquid outlet hole are positioned on the same side of the liquid storage vertical pipe, the pressurizing hole is back to the exhaust hole and the liquid outlet hole, and the position of the pressurizing hole is higher than that of the exhaust hole.
Preferably, the air injection system comprises a high-pressure air bottle and an air injection pipeline, an air pressure reducing valve, an air fine-tuning valve, an air flow meter and an air inlet valve are sequentially arranged on the air injection pipeline, and the air inlet valve is a one-way valve.
Preferably, the parts of the air injection pipeline, the nitrogen injection pipeline and the exhaust pipeline, which are inserted into the liquid storage vertical pipe, are subjected to anti-corrosion treatment, and the material of the corrosion experiment pipe section is the same as that of the underground actual water injection pipe section.
Preferably, the outer side of the liquid storage vertical pipe body, the outer side of the liquid storage vertical pipe upper cover, the outer side of the liquid storage vertical pipe lower cover, the outer side of the upper horizontal pipe, the outer side of the vertical pipe, the outer side of the lower horizontal pipe, the outer side of the upper L-shaped pipe, the outer side of the lower L-shaped pipe and the outer side of the corrosion experiment pipe section are all provided with heat insulation sleeves.
Preferably, the liquid storage vertical pipe lower cover is conical and is in threaded sealing connection with the liquid storage vertical pipe body through conical threads, and sealing performance is guaranteed.
Preferably, the height of the liquid storage vertical pipe is 120cm, the distance between the annular partition plate and the top end of the liquid storage vertical pipe is 20cm, the length of the corrosion experiment pipe section is 20cm, and the outer diameter and the wall thickness of the corrosion experiment pipe section are the same as those of an actual underground water injection pipe column.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the invention realizes the oxygen corrosion simulation evaluation of the whole shaft pipe column of the injection well in consideration of the consumption of the dissolved oxygen corrosion through the high-temperature high-pressure closed circulating corrosion system and the dissolved oxygen monitoring system, thereby more truly simulating the corrosion working condition of the underground pipe column of the injection well.
2 the nitrogen pressurization system and the electric heating system of the device can automatically pressurize and heat the circulating flow test solution in the experimental process according to the temperature and the pressure of the underground pipe column in the actual water injection process, ensure that the change of the concentration of the dissolved oxygen in the test solution along with time is consistent with the actual concentration of the dissolved oxygen at the corresponding well depth, and ensure the experimental precision.
3 the aeration circulating system of the device can realize the saturation stability of the dissolved oxygen in the test solution at the initial moment of the corrosion experiment, and the corrosion reaction circulating system and the dissolved oxygen monitoring system can realize the simulation of the dissolved oxygen concentration distribution of the whole shaft pipe column of the water injection well considering the corrosion consumption of the dissolved oxygen, thereby more truly simulating the corrosion working condition of the underground pipe column of the water injection well.
4, by establishing a function relation between the well depth and the experiment time in the water injection process and combining the corrosion electrochemical theory, the method calculates the dissolved oxygen corrosion rate of the whole shaft pipe column of the water injection well through one-time experiment data, greatly reduces the experiment times, and obviously reduces the experiment time and the experiment cost.
The device is not only suitable for the corrosion evaluation of the full-well-bore closed pipe column considering the consumption of the corrosion medium in the underground water injection system, but also suitable for the corrosion evaluation of the pipe column considering the consumption of the corrosion medium in the ground water delivery closed pipeline system.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Reference numerals
In the attached drawings, 1, a high-pressure nitrogen cylinder; 2. a nitrogen injection pipeline; 3. a nitrogen pressure reducing valve; 4. a nitrogen pressure reducing valve controller; 5. a pressure gauge; 6. a nitrogen gas inlet valve; 7. a high pressure air bottle; 8. an air injection pipeline; 9. an air relief valve; 10. an air trim valve; 11. an air flow meter; 12. an air intake valve; 13. a liquid storage vertical pipe; 13a, a liquid storage vertical pipe body; 13b, an upper cover of the liquid storage vertical pipe; 13c, a lower cover of the liquid storage vertical pipe; 13d, an annular partition plate; 13e, a pressurizing hole; 13f, an exhaust hole; 13g, liquid outlet holes; 13h, round holes; 13i, an air inlet hole; 13j, a liquid inlet hole; 14. an exhaust line; 15. an exhaust valve; 16. a heating rod; 17. an electrical heating controller; 18. an upper horizontal pipe; 19. a vertical tube; 20. a lower horizontal pipe; 21. an upper horizontal pipe liquid inlet valve; 22. monitoring short circuit by dissolved oxygen; 22a detecting the interface circular hole; 23. a vertical pipe upper valve; 24. a vertical pipe lower valve; 25. a liquid outlet valve of the lower horizontal pipe; 26. a peristaltic pump; 27. a liquid flow meter; 28. a peristaltic pump controller; 29. a dissolved oxygen detector; 30. an upper tee joint; 31. a lower tee joint; 32. an upper L-shaped pipe valve; 33. a lower L-shaped pipe valve; 34. an upper L-shaped pipe; 35. a lower L-shaped pipe; 36. corroding the experimental pipe section; 37. a computer; 38. an upper reducer union; 39. and a lower reducing joint.
Detailed Description
Referring to fig. 1, an embodiment of a dissolved oxygen corrosion simulation device for a full well casing pipe column of a water injection well comprises a liquid storage vertical pipe 13, an air injection system, a nitrogen pressurization system, an electric heating system, an aeration circulation system, a dissolved oxygen monitoring system, a corrosion reaction circulation system and an experiment auxiliary control system.
The liquid storage vertical pipe 13 comprises a liquid storage vertical pipe body 13a, a liquid storage vertical pipe upper cover 13b and a liquid storage vertical pipe lower cover 13c, an annular partition plate 13d is arranged on the inner side of the upper portion of the liquid storage vertical pipe body 13a, a pressurizing hole 13e is arranged on the upper portion of the left side, an exhaust hole 13f and a liquid outlet hole 13g are arranged on the upper portion of the right side, the pressurizing hole 13e and the exhaust hole 13f are both located above the annular partition plate 13d, the position of the pressurizing hole 13e is higher than that of the exhaust hole 13f, the liquid outlet hole 13g is located at a position close to the lower portion of the annular partition plate 13d, the exhaust hole 13f is in threaded sealing connection with the exhaust pipeline 14, the exhaust pipeline 14 is provided with an exhaust valve 15, the exhaust valve 15 is a one-way valve, the annular partition plate 13d and the liquid storage vertical pipe 13 are integrally manufactured, a circular hole 13h is formed in the middle of the liquid storage vertical pipe upper cover 13b and is in threaded sealing connection with the liquid storage vertical pipe body 13a, and the liquid storage vertical pipe lower cover 13c is conical, The bottom of the liquid storage vertical pipe is provided with an air inlet hole 13i and a liquid inlet hole 13j, and the liquid storage vertical pipe lower cover 13c is connected with the liquid storage vertical pipe body 13a in a sealing mode through threads.
The air injection system comprises a high-pressure air bottle 7 and an air injection pipeline 8, an air pressure reducing valve 9, an air fine-tuning valve 10, an air flow meter 11 and an air inlet valve 12 are sequentially arranged on the air injection pipeline 8, the air inlet valve 12 is a one-way valve, and the air injection pipeline 8 is in threaded sealing connection with an air inlet hole 13i at the bottom of a liquid storage vertical pipe lower cover 13 c.
The nitrogen pressurization system comprises a high-pressure nitrogen bottle 1 and a nitrogen injection pipeline 2, a nitrogen pressure reducing valve 3, a nitrogen pressure reducing valve controller 4, a pressure gauge 5 and a nitrogen gas inlet valve 6 are sequentially arranged on the nitrogen injection pipeline 2, the nitrogen pressure reducing valve controller 4 has programming and communication functions and is internally provided with pressure-time data p (t) required by an experiment, the nitrogen pressure reducing valve controller 4 is connected with the pressure gauge 5, the data of the pressure gauge 5 can be read in real time and is compared with preset experiment pressure-time data p (t), the opening degree of the nitrogen pressure reducing valve 3 is fed back and adjusted, automatic pressurization of liquid in the liquid storage vertical pipe 13 is achieved, and the nitrogen injection pipeline 2 is in threaded sealing connection with a pressurization hole 13e in the upper portion of the left side of the liquid storage vertical pipe body 13 a.
The electric heating system comprises a heating rod 16 and an electric heating controller 17, the electric heating controller 17 has programming and communication functions, temperature-time data T (t) required by experiments are built in, automatic control of the temperature of liquid in the liquid storage vertical pipe 13 is achieved, the heating rod 16 penetrates through a circular hole 13h of an upper cover 13b of the liquid storage vertical pipe and an annular partition plate 13d on the inner side of the upper portion of a pipe body 13a of the liquid storage vertical pipe, the heating rod 16 is connected with the upper cover 13b of the liquid storage vertical pipe in a threaded sealing mode, and proper intervals are formed between the heating rod 16 and the annular partition plate 13 d.
The aeration circulating system comprises a liquid storage vertical pipe 13, an upper horizontal pipe 18, a vertical pipe 19 and a lower horizontal pipe 20. An upper horizontal pipe liquid inlet valve 21 and a dissolved oxygen monitoring short circuit 22 are arranged on the upper horizontal pipe 18, a detection interface round hole 22a is formed in the upper portion of the dissolved oxygen monitoring short circuit 22, and the left side of the upper horizontal pipe 18 is in threaded sealing connection with a liquid outlet hole 13g in the upper portion of the right side of the liquid storage vertical pipe 13; the vertical pipe 19 is provided with a vertical pipe upper valve 23 and a vertical pipe lower valve 24; be provided with lower horizontal pipe drain valve 25, peristaltic pump 26, fluid flowmeter 27 and peristaltic pump controller 28 on the lower horizontal pipe 20, peristaltic pump controller 28 has programming and communication function and can predetermine corrosion test liquid flow Q, peristaltic pump 26 flow accessible peristaltic pump controller 28 automatic control, lower horizontal pipe 20 left side and liquid storage riser lower cover 13c bottom feed liquor hole 13j pass through screw thread sealing connection. The right side of the upper horizontal pipe 18 is connected with the vertical pipe 19 through an upper tee joint 30, and the right side of the lower horizontal pipe 20 is connected with the vertical pipe 19 through a lower tee joint 31. The upper horizontal pipe liquid inlet valve 21, the vertical pipe upper valve 23, the vertical pipe lower valve 24 and the lower horizontal pipe liquid outlet valve 25 are all one-way valves.
Dissolved oxygen monitoring system includes dissolved oxygen monitoring short circuit 22 and dissolved oxygen detector 29, and dissolved oxygen detector 29 inserts the liquid middle part through dissolved oxygen monitoring short circuit 22 upper portion detection interface round hole 22a, and dissolved oxygen detector 29 passes through screw thread sealing connection with dissolved oxygen monitoring short circuit 22 upper portion detection interface round hole 22a, and dissolved oxygen detector 29 possesses communication function.
The corrosion reaction circulating system comprises a liquid storage vertical pipe 13, an upper horizontal pipe 18, an upper L-shaped pipe 34, a corrosion experiment pipe section 36, a lower L-shaped pipe 35 and a lower horizontal pipe 20, wherein the upper L-shaped pipe 34 is provided with an upper L-shaped pipe valve 32, the lower L-shaped pipe 35 is provided with a lower L-shaped pipe valve 33, the corrosion experiment pipe section 36 is hermetically connected with the upper L-shaped pipe 34 through an upper reducing joint 38, and the corrosion experiment pipe section 36 is hermetically connected with the lower L-shaped pipe 35 through a lower reducing joint 39. The right outlet of the upper tee joint 30 is hermetically connected with an upper L-shaped pipe 34, and the right outlet of the lower tee joint 31 is hermetically connected with a lower L-shaped pipe 35. The upper L-shaped pipe valve 32 and the lower L-shaped pipe valve 33 are both one-way valves.
The experiment auxiliary control system comprises a computer 37 and auxiliary control software, wherein the computer 37 is wirelessly connected with the nitrogen pressure reduction valve controller 4, the electric heating controller 17, the dissolved oxygen detector 29 and the peristaltic pump controller 28, programming setting on pressure-time data p (t), temperature-time data T (t) and corrosion test liquid flow data Q required by an experiment is realized through the auxiliary control software, automatic feedback control on the experiment pressure, the experiment temperature and the experiment liquid flow is realized in a matching way, and the change condition of the dissolved oxygen detection data along with the experiment time is automatically recorded.
Preferably, the used liquid storage vertical pipe body 13a, the liquid storage vertical pipe upper cover 13b, the liquid storage vertical pipe lower cover 13C, the heating rod 16, the upper horizontal pipe 18, the vertical pipe 19, the lower horizontal pipe 20, the upper L-shaped pipe 34, the lower L-shaped pipe 35, the upper tee 30, the lower tee 31, the upper reducer union 38, the lower reducer union 39, the upper horizontal pipe liquid inlet valve 21, the vertical pipe upper valve 23, the vertical pipe lower valve 24, the lower horizontal pipe liquid outlet valve 25, the upper L-shaped pipe valve 32, the lower L-shaped pipe valve 33, the dissolved oxygen monitoring short circuit 22 and the peristaltic pump 26 are all made of Hastelloy C276 materials; the parts of the air injection pipeline 8, the nitrogen injection pipeline 2 and the exhaust pipeline 14, which are inserted into the liquid storage vertical pipe 13, are subjected to corrosion prevention treatment, so that the experimental error is reduced.
Preferably, the corrosion test pipe section 36 used is made from the actual water injection string material downhole.
Preferably, the height of the liquid storage vertical pipe 13 is 120cm, the distance between an annular partition plate 13d in the liquid storage vertical pipe 13 and the upper end is 20cm, the outer diameter and the wall thickness of the liquid storage vertical pipe 13 are selectable, and the volume of a pipe section below the annular partition plate 13d of the liquid storage vertical pipe is V1；
Preferably, the length of the corrosion experiment pipe section 36 is 20cm, the outer diameter and the wall thickness are the same as those of the underground water injection pipe column, and the volume of the corrosion experiment pipe section 36 is V2；
Preferably, the upper horizontal pipe 18 has a volume V3The volume of the lower horizontal pipe 20 is V4The upper L-shaped pipe 34 has a volume V5The lower L-shaped pipe 35 has a volume V6The vertical pipe 19 has a volume V7And are all thick-walled pipes to meet the pressure requirement.
Preferably, heat insulation sleeves are arranged on the outer side of the liquid storage vertical pipe body 13a, the outer side of the liquid storage vertical pipe upper cover 13b, the outer side of the liquid storage vertical pipe lower cover 13c, the outer side of the upper horizontal pipe 18, the outer side of the vertical pipe 19, the outer side of the lower horizontal pipe 20, the outer side of the upper L-shaped pipe 34, the outer side of the lower L-shaped pipe 35 and the outer side of the corrosion experiment pipe section 36.
A method for evaluating dissolved oxygen corrosion of a whole well pipe column of a simulated water injection well comprises the following steps:
the method comprises the following steps: and (3) obtaining pressure-time data p (t) of the experimental nitrogen pressure reduction valve controller 4 and temperature-time data T (t) of the electric heating controller 17 by conversion according to the formula (1) according to the pressure p (h) and the temperature T (h) of the underground water injection pipe column at any well depth h.
In the formula: t is experimental time, min; q is the daily discharge of injected water, m3D; h is any well depth, m; d is the inner diameter of the water injection pipe column, mm; v1The volume L of a pipe section below the annular partition plate 13d of the liquid storage vertical pipe; v2Is 36 volumes, L, of the corrosion test pipe section; v3Is the volume, L, of the upper horizontal tube 18; v4Is the lower horizontal pipe 20 volume, L; v5The volume of the upper L-shaped pipe 34, L; v6The volume of the lower L-shaped pipe 35 is L.
Step two: connecting the air injection pipeline 8 and the lower horizontal pipe 20 with a liquid storage vertical pipe lower cover 13c, and connecting the liquid storage vertical pipe lower cover 13c with a liquid storage vertical pipe body 13 a; connecting the nitrogen injection pipeline 2 with a pressurizing hole 13e of the liquid storage vertical pipe body 13a, connecting the upper horizontal pipe 18 with a liquid outlet hole 13g of the liquid storage vertical pipe body 13a, and connecting the exhaust pipeline 14 with an exhaust hole 13f of the liquid storage vertical pipe body 13 a; a corrosion test pipe section 36 is connected with an upper reducing joint 38 and a lower reducing joint 39, the upper reducing joint 38 is connected with an upper L-shaped pipe 34, the lower reducing joint 39 is connected with a lower L-shaped pipe 35, all pipelines, equipment and valves are connected at the same time, and all the equipment and the valves are ensured to be in a closed state.
Step three: will have a volume of
The test solution is poured into the liquid storage vertical pipe 13, the heating rod 16 is connected with the liquid storage vertical pipe upper cover 13b, and then the liquid storage vertical pipe upper cover 13b is connected with the liquid storage vertical pipe body 13 a.
Step four: the power supply of the nitrogen pressure reduction valve controller 4, the power supply of the electric heating controller 17, the power supply of the dissolved oxygen detector 29, the power supply of the peristaltic pump controller 28, the computer 37 and auxiliary control software are opened to ensure that the computer 37 is communicated with each controller normally, and pressure-time data p (t) of the nitrogen pressure reduction valve controller 4, temperature-time data T (t) of the electric heating controller 17 and corrosion test liquid flow rate data Q of the peristaltic pump controller 28 are set through the auxiliary control software.
Step five: opening an exhaust valve 15, an air reducing valve 9, an air fine-tuning valve 10, an air inlet valve 12, an upper horizontal pipe liquid inlet valve 21, a vertical pipe upper valve 23, a vertical pipe lower valve 24 and a lower horizontal pipe liquid outlet valve 25, starting a peristaltic pump 26, adjusting the air fine-tuning valve 10, stabilizing the content of dissolved oxygen in the flowing test solution measured by a dissolved oxygen detector 29 under the condition of ensuring the stable flow displayed by an air flow meter 11, and obtaining the saturated dissolved oxygen content C under the condition of ground temperature and pressureaq(0)。
Step six: closing a peristaltic pump 26, closing an air inlet valve 12, closing an exhaust valve 15, closing an upper vertical pipe valve 23, closing a lower vertical pipe valve 24, opening an upper L-shaped pipe valve 32, opening a lower L-shaped pipe valve 33, opening a nitrogen pressure reducing valve 3, opening a nitrogen inlet valve 6, simultaneously starting the peristaltic pump 26, starting a nitrogen pressure reducing valve controller 4 and starting an electric heating controller 17, pressurizing and heating the test solution according to preset pressure and temperature, circularly reacting with a corrosion test pipe section 36 through the peristaltic pump 26, and simultaneously starting monitoring and recording the change data [ t, C ] of the concentration of dissolved oxygen in the test solution along with timeaq]。
Step seven: experimental data of dissolved oxygen concentration [ t, C ] obtained from corrosion reaction testaq]Calculating the dissolved oxygen corrosion rate distribution R of the whole well bobbin columnc(h)。
Further, the full well bobbin column dissolved oxygen corrosion rate distribution Rc(h) The calculation process of (2) is as follows:
1) polynomial fitting of dissolved oxygen concentration experimental data [ t, C ]aq]Obtaining the change curve C of the concentration of the dissolved oxygen along with the time in the experimental processaq(t)；
2) According to Caq(t) calculating the corrosion current i of the corrosion experiment pipe section 36 dissolved oxygen in the experiment processcg(t)
In the formula: i.e. icg(t) is corrosion experiment pipe section 36 dissolved oxygen corrosion current in the experiment process, A/m2；Caq(t) is the dissolved oxygen concentration in the experimental process, mg/L;
3) i is prepared according to formula (1)cg(t) converting into actual downhole tubular column dissolved oxygen corrosion current i at corresponding well depth hcw(h)；
4) According to icw(h) Calculating the dissolved oxygen corrosion rate distribution R of the whole well bobbin columnc(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; i.e. icw(h) Is the actual dissolved oxygen corrosion current of the underground pipe column at the well depth h, A/m2；MFeThe molecular weight of the iron is 0.056 kg/mol; rhoFe7850kg/m, which is the density of iron3(ii) a n-number of electrons lost in anode reaction, 2; F-Faraday electrical unit, 96485C/mol.
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 (8)
1. The utility model provides a full well bobbin post dissolved oxygen of water injection well corrodes analogue means which characterized in that:
the device comprises a liquid storage vertical pipe (13), wherein an annular partition plate (13d) is arranged on the upper portion of an inner cavity of the liquid storage vertical pipe (13) along the circumferential direction, the inner cavity of a liquid storage vertical pipe body (13a) is divided into an upper cavity and a lower cavity by the annular partition plate (13d), the lower cavity is used for containing test solution, a pressurizing hole (13e) and an exhaust hole (13f) are formed in the wall of the upper cavity, and the pressurizing hole (13e) is connected with a nitrogen pressurizing system and used for automatically pressurizing the test solution; the exhaust hole (13f) is connected with an exhaust pipeline (14), an electric heating system is installed at the top of the liquid storage vertical pipe (13) and used for automatically heating a test solution, an air inlet hole (13i) and a liquid inlet hole (13j) are formed in the bottom of the liquid storage vertical pipe (13), a liquid outlet hole (13g) is formed in the wall of the lower cavity, the air inlet hole (13i) is connected with an air injection system and used for supplying oxygen to the test solution, the liquid inlet hole (13j) and the liquid outlet hole (13g) are connected with an aeration system and a corrosion reaction system, the aeration system is used for carrying out aeration treatment on the test solution, and the corrosion reaction system is used for carrying out corrosion reaction on the test solution and a corrosion pipe section experiment;
the nitrogen pressurization system comprises a high-pressure nitrogen bottle (1) and a nitrogen injection pipeline (2) which are connected with each other, the nitrogen injection pipeline (2) is connected with a pressurization hole (13e), a nitrogen pressure reducing valve (3), a pressure gauge (5) and a nitrogen gas inlet valve (6) are sequentially arranged on the nitrogen injection pipeline (2), the nitrogen pressure reducing valve (3) and the pressure gauge (5) are connected with a nitrogen pressure reducing valve controller (4), pressure-time data are arranged in the nitrogen pressure reducing valve controller (4), the nitrogen pressure reducing valve controller (4) reads the data of the pressure gauge (5) in real time and compares the data with preset experimental pressure-time data, and the opening degree of the nitrogen pressure reducing valve (3) is fed back and adjusted, so that the automatic pressurization of liquid in a liquid storage vertical pipe (13) is realized;
an exhaust valve (15) is arranged on the exhaust pipeline (14), and the exhaust valve (15) is a one-way valve;
the electric heating system comprises a heating rod (16) and an electric heating controller (17), the heating rod (16) is used for downwards penetrating through an annular partition plate (13d) to be inserted into the test solution, a gap is reserved between the heating rod (16) and the annular partition plate (13d), and the electric heating controller (17) is internally provided with temperature-time data to realize automatic control of the temperature of the test solution in the liquid storage vertical pipe (13);
the aeration system comprises an upper horizontal pipe (18), a lower horizontal pipe (20) and a vertical pipe (19) connected with the outer ends of the upper horizontal pipe (18) and the lower horizontal pipe (20), wherein the inner end of the upper horizontal pipe (18) is connected with a liquid outlet hole (13g), the inner end of the lower horizontal pipe (20) is connected with a liquid inlet hole (13j) to form an aeration circulating system, the corrosion reaction system comprises an upper L-shaped pipe (34), a corrosion experiment pipe section (36) and a lower L-shaped pipe (35) which are sequentially connected, the upper L-shaped pipe (34) is connected with the outer end of the upper horizontal pipe (18), the lower L-shaped pipe (35) is connected with the outer end of the lower horizontal pipe (20) to form a corrosion reaction circulating system, the upper horizontal pipe (18) is provided with an upper horizontal pipe liquid inlet valve (21) and a dissolved oxygen detector (29), and the dissolved oxygen detector (29) is used for detecting the dissolved oxygen content of the test solution in the upper horizontal pipe (18), the vertical pipe (19) is provided with a vertical pipe upper valve (23) and a vertical pipe lower valve (24), a liquid flow meter (27), a peristaltic pump (26) and a lower horizontal pipe liquid outlet valve (25) are sequentially arranged on the lower horizontal pipe (20) along the flow direction, the peristaltic pump (26) and the liquid flow meter (27) are connected with a peristaltic pump controller (28), the peristaltic pump controller (28) presets a corrosion test liquid flow Q, the flow of the peristaltic pump (26) is automatically controlled by the peristaltic pump controller (28), the upper horizontal pipe liquid inlet valve (21), the vertical pipe upper valve (23), the vertical pipe lower valve (24) and the lower horizontal pipe liquid outlet valve (25) are all one-way valves, an upper L-shaped pipe valve (32) is arranged on the upper L-shaped pipe (34), a lower L-shaped pipe valve (33) is arranged on the lower L-shaped pipe (35), the upper L-shaped pipe valve (32) and the lower L-shaped pipe valve (33) are both one-way valves;
still include experiment auxiliary control system, experiment auxiliary control system includes computer (37), auxiliary control software, computer (37) with nitrogen gas relief pressure valve controller (4), electrical heating controller (17), dissolved oxygen detector (29), peristaltic pump controller (28) are connected, realize programming the setting to the required pressure-time data of experiment, temperature-time data, corrosion test liquid flow data through auxiliary control software, and the cooperation is realized carrying out automatic feedback control to experiment pressure, experiment temperature and experiment liquid flow, and the automatic record dissolved oxygen detects the change condition of data along with the experiment time simultaneously.
2. The device for simulating dissolved oxygen corrosion of the full wellbore tubular column of the water injection well according to claim 1, wherein the liquid storage vertical pipe (13) is provided with a liquid storage vertical pipe body (13a), the top of the liquid storage vertical pipe (13) is a liquid storage vertical pipe upper cover (13b), the bottom of the liquid storage vertical pipe (13) is a liquid storage vertical pipe lower cover (13c), and the liquid storage vertical pipe upper cover (13b) and the liquid storage vertical pipe lower cover (13c) are respectively connected with the liquid storage vertical pipe body (13a) in a threaded sealing manner.
3. The device for simulating dissolved oxygen corrosion of the full wellbore tubular column of the water injection well according to claim 1 or 2, wherein the exhaust hole (13f) and the liquid outlet hole (13g) are located on the same side of the liquid storage vertical pipe (13), the pressurizing hole (13e) faces away from the exhaust hole (13f) and the liquid outlet hole (13g), and the pressurizing hole (13e) is higher than the exhaust hole (13 f).
4. The device for simulating dissolved oxygen corrosion of the full wellbore tubular column of the water injection well according to claim 1 or 2, wherein the air injection system comprises a high-pressure air bottle (7) and an air injection pipeline (8), an air pressure reducing valve (9), an air fine-tuning valve (10), an air flow meter (11) and an air intake valve (12) are sequentially arranged on the air injection pipeline (8), and the air intake valve (12) is a one-way valve.
5. The device for simulating dissolved oxygen corrosion of the full wellbore tubular column of the water injection well according to claim 4, wherein the parts of the air injection pipeline (8), the nitrogen injection pipeline (2) and the exhaust pipeline (14) inserted into the liquid storage vertical pipe (13) are subjected to corrosion prevention treatment, and the material of the corrosion experiment pipe section (36) is the same as that of the actual water injection tubular column under the well.
6. The dissolved oxygen corrosion simulation device for the whole well casing pipe column of the water injection well according to claim 2, wherein heat insulation sleeves are arranged on the outer side of the liquid storage vertical pipe body (13a), the outer side of the liquid storage vertical pipe upper cover (13b), the outer side of the liquid storage vertical pipe lower cover (13c), the outer side of the upper horizontal pipe (18), the outer side of the vertical pipe (19), the outer side of the lower horizontal pipe (20), the outer side of the upper L-shaped pipe (34), the outer side of the lower L-shaped pipe (35) and the outer side of the corrosion experiment pipe section (36).
7. The injection well full wellbore tubular column dissolved oxygen corrosion simulation device according to claim 2, wherein the liquid storage vertical pipe lower cover (13c) is conical and is in threaded sealing connection with the liquid storage vertical pipe body (13a) through conical threads for ensuring sealing performance.
8. The injection well full wellbore tubular column dissolved oxygen corrosion simulation device according to claim 1, wherein the height of the liquid storage vertical pipe (13) is 120cm, the distance between the annular partition plate (13d) and the top end of the liquid storage vertical pipe (13) is 20cm, the length of the corrosion experiment pipe section (36) is 20cm, and the outer diameter and the wall thickness of the corrosion experiment pipe section (36) are the same as those of an actual injection well column in a well.
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