CN111305793A - Oil field shaft under-deposit corrosion experiment device and method - Google Patents
Oil field shaft under-deposit corrosion experiment device and method Download PDFInfo
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- CN111305793A CN111305793A CN202010128948.0A CN202010128948A CN111305793A CN 111305793 A CN111305793 A CN 111305793A CN 202010128948 A CN202010128948 A CN 202010128948A CN 111305793 A CN111305793 A CN 111305793A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/02—Equipment or details not covered by groups E21B15/00 - E21B40/00 in situ inhibition of corrosion in boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
Abstract
The invention belongs to the technical field of oil and gas field wellbore pipe column corrosion prevention research, and particularly relates to an oil field wellbore under-deposit corrosion experiment device and method. The invention consists of a body, a plug and a lead; the body is a hollow cylindrical body consisting of a pentagonal prism and a cylinder, and the inner side wall of the cylinder is provided with threads; two blind holes are formed in each edge surface of the outer side wall of the pentagonal prism, a screw hole and a through hole communicated with the inner cavity of the body are formed in the first blind hole far away from one end of the cylinder, and a lead fixed by a nylon screw in the first blind hole extends into the cavity of the columnar body through the through hole. The invention completes the experiment of truly reflecting the corrosion and scaling environment of the pipe column at the bottom of the oil field by connecting the experimental device for the under-scale corrosion of the shaft of the oil field, the well descending, the experimental device for the under-scale corrosion of the shaft of the oil field and the collection and analysis of solid sediments, thereby adopting targeted anti-corrosion and anti-scaling measures and slowing down the generation of the under-scale corrosion.
Description
Technical Field
The invention belongs to the technical field of oil and gas field wellbore pipe column corrosion prevention research, and particularly relates to an oil field wellbore under-deposit corrosion experiment device and method.
Background
The oil field development faces the threat of corrosion and scaling, and the oil gas exploitation well bore pipe column contains Ca due to high mineralization degree of stratum fluid2+、Mg2+、Ba2+、Sr2+Scale-forming cations, with SO contained in other producing horizons4 2-、HCO3 -、CO3 2-The scaling anions are incompatible, and the content of the scaling ions is different among different fluids, so that the scaling problem is caused by mixing in a shaft. Carbonates in the formation may also produce natural scaling due to changes in temperature pressure in the wellbore. Meanwhile, the medium in the oil field pipeline is rich in CO2、H2S, high salinity salt and other corrosive substances, the corrosion is strong, and the corrosion and the damage of the shaft pipe column are serious. On-site investigation finds that the corrosion failure of the oil pipe is mainly characterized by local perforation damage, a plurality of deep corrosion pits are often formed below the scaling product, even the perforation damage, and the corrosion and the scaling have great correlation.
Technicians pay more attention to the corrosion under the oil field pipeline scale, and research strength is increased. The research means is focused on the electrochemical test under the indoor simulation field environment, and the research direction is focused on (1) evaluating various parameters of the internal and external media of the scale layer formed by the corrosion under the scale; (2) the scale layer components and characteristics related to the diffusion channel are applied; (3) accurately simulating the formation and development mechanism of the under-deposit corrosion. The research methods are various: if artificial rock cores with different thicknesses, grains and porosities are processed to cover the surface of the carbon steel test piece, the corrosion rate and the electrochemical performance under different corrosion media are tested; and after the cathodes and the anodes in the self-made blocked battery simulating under-deposit corrosion are short-circuited for different time, scanning and testing the electrodes in the blocked anode area by adopting a potentiodynamic polarization technology with a polarization scanning interval of-150 and 150 mV. The Corrosion behavior of 316L stainless steel under the working condition of a simulated low-temperature multi-effect evaporator at 72 ℃ is subjected to EIS long-term monitoring by Xin and Li (corosion Science,2014, 81(2):96-101), and the effect of a passive film and a deposited layer on the surface of the 316L stainless steel on Corrosion is obtained by analyzing an impedance spectrum. ZL201420538170.0 electrochemical device for testing for under-scale corrosion of elemental sulfur. ZL201820650332.8 is an experimental device for dynamically simulating under-deposit corrosion. The scale formation in the laboratory, and in situ scaling, used in these studies was very different. Pure dirt such as calcium sulfate, calcium carbonate, barium sulfate and the like is mainly prepared for chemical reagents in a laboratory, and sediments in a field pipeline mainly comprise sand, silt, paraffin, corrosion products, scaling products, bacterial corpses and the like. The indoor research result cannot completely and truly reflect the actual situation of the site.
Disclosure of Invention
The invention provides an experimental device and method for corrosion under scale of an oil field shaft, and aims to provide a research device and method capable of truly reflecting the actual situation of the corrosion under scale field of the oil field shaft.
In order to achieve the purpose, the invention adopts the technical scheme that:
an experimental device for corrosion under the scale of a shaft of an oil field comprises a body, a plug and a lead; the body is a hollow cylindrical body; one end of the body is provided with a connecting hole, and the connecting hole is connected with the plug in a matched manner; the body lateral wall is provided with a plurality of blind holes with different depths, a part of the blind holes are internally provided with screw holes and through holes communicated with the inner cavity of the body, fixing parts are connected in the screw holes, one ends of the wires are fixed by the fixing parts, and the other ends of the wires extend into the cavity of the body through the through holes.
The connecting hole is a threaded hole, and the plug is provided with a thread matched with the threaded hole; the screw hole is an M5 threaded hole, and the diameter of the through hole is 2 mm; the fixing piece is a nylon bolt, and the joint of the nylon bolt and the lead is sealed by sealant.
The body is a cylindrical body consisting of a hollow pentagonal prism and a hollow cylinder, and the inner side wall of the cylinder is provided with threads; the blind hole provided with the screw hole is a first blind hole, and the rest are second blind holes; the first blind hole and the second blind hole are located on each edge surface of the outer side wall of the pentagonal prism.
The first blind holes and the second blind holes are respectively arranged in a group of five and are uniformly arranged along the radial direction of the pentagonal prism.
The diameters of the five first blind holes are the same, and the depths of the five first blind holes are different; the diameters of the five second blind holes are the same, and the depths of the five second blind holes are different; the first blind hole and the second blind hole have the same diameter.
The centers of the five blind holes in each group are in a common circle; the diameters of the first blind hole and the second blind hole are both 30mm, and the blind holes of the five prism faces are respectively 2mm, 4mm, 6mm, 8mm and 10mm in depth.
The wire is a thin copper wire with an insulating sheath, and the length of the wire is 18-22 cm.
The plug is processed by polytetrafluoroethylene, and the body is processed by carbon steel.
The use method of the oilfield shaft under-deposit corrosion experiment device comprises the following steps
The method comprises the following steps: connecting oil field shaft under-deposit corrosion experimental device
Respectively screwing nylon bolts into a group of five blind holes far away from the cylinder on the body and respectively connecting one ends of the wires, screwing the nylon bolts after one ends of the wires are firmly connected, then penetrating the other ends of the wires into the inner cavity of the pentagonal prism through the through holes, binding the wires together after all 5 wires are penetrated, and screwing the plugs for plugging; coating sealant on the joint of the nylon bolt and the lead and the outer surface of the through hole;
step two: down-hole of oil field shaft scale corrosion experimental device
Connecting and screwing the cylindrical internal thread part of the well shaft scale corrosion experiment device body of the oil field connected in the step with a sieve tube at the lower part of an oil well pump, and putting the well shaft scale corrosion experiment device of the oil field into the bottom of the well shaft along with the oil well pump by using an oil pipe;
step three: experimental device for recovering corrosion under scale of oil field shaft
After the second step is finished and the well is hung for a preset period, taking back the oilfield shaft under-deposit corrosion experiment device from the well;
step four: the solid deposit was collected and analyzed
Analyzing the solid sediments with different thicknesses deposited in the first blind holes with different depths on the recovered oil field well shaft under-scale corrosion experiment device in the third step;
step five: analyzing recycled oil field well bore under-scale corrosion experiment device
Cleaning up the sediment in the second blind hole without the conducting wire, splitting along the center line of the second blind hole, and observing the appearance and the depth of the corrosion pit; and (3) testing the first blind hole with the lead by using an electrochemical system, analyzing the influence on the corrosion under the scale of the carbon steel, summarizing and analyzing experimental data, and obtaining the corrosion degree and reason under the scale of the shaft in the block.
The suspension preset period in the step three is more than 3 months.
Has the advantages that: according to the device, two rows of blind holes with different depths are processed on the surface of the body of the oilfield shaft scale corrosion experiment device hung at the lower end of the underground pipe column, one row of blind holes is used for testing the influence of scale layers with different thicknesses on the depth of a corrosion pit, and the back of the other row of blind holes is connected with a copper wire for researching the corrosion electrochemical performance. The body forms a scale layer with corresponding thickness by natural scaling in a high-temperature and high-pressure environment of a shaft. And taking out the product for indoor analysis after more than three months to obtain the corresponding relation between the scaling and the corrosion. The method is convenient to implement, can truly reflect the corrosion and scaling environment of the bottom hole pipe column of the oil field, defines the pipe column corrosion and scaling perforation mechanism, can provide targeted anticorrosion and antiscaling measures and slows down the occurrence of under-scale corrosion.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to clearly understand the technical solutions of the present invention and to implement the technical solutions according to the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a cross-sectional view of a first blind via with a lead in accordance with the present invention.
In the figure: 1-nylon bolt; 2-a through hole; 3-a wire; 4-body; 5-plugging by a plug; 6-connecting hole; 7-a first blind hole; 8-screw holes; 9-a pentagonal prism; 10-cylinder; 11-second blind hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the device for testing the under-scale corrosion of the oil well shaft shown in the figure 1 comprises a body 4, a plug 5 and a lead 3; the body 4 is a hollow cylindrical body; one end of the body 4 is provided with a connecting hole 6, and the connecting hole 6 is connected with the plug 5 in a matching way; open the blind hole that has a plurality of different degree of depth on the 4 lateral walls of body, wherein partly the through-hole 2 that the downthehole screw hole 8 of opening and communicate with 4 inner chambers of body, the mounting is connected to the screw hole 8 in, the mounting is fixed with the one end of wire 3, and the other end of wire 3 passes through-hole 2 and extends to in the cavity of body 4.
When the device is in actual use, the blind holes connected with the wires 3 in the body 4 are respectively connected with one ends of the wires 3, after the wires 3 are firmly connected, the other ends of the wires 3 penetrate into the inner cavity of the body 4 through the through holes 2, and after all the wires 3 penetrate, the blind holes are screwed and plugged by plugs; coating sealant on the joint of the blind hole connected with the lead 3 and the outer surface of the through hole 2; and then connecting and screwing the cylinder 10 part of the well-connected oil well shaft scale corrosion experiment device body with a sieve tube at the lower part of the oil well pump, and putting the oil well shaft scale corrosion experiment device into the bottom of the well shaft along with the oil well pump by using an oil pipe. When the oilfield shaft under-scale corrosion experiment device is hung at the bottom of the shaft for more than three months, the oilfield shaft under-scale corrosion experiment device is taken back from the well, solid deposits with different thicknesses deposited in first blind holes with different depths on the oilfield shaft under-scale corrosion experiment device are recovered, and the deposits are analyzed. The sediment is generally analyzed by X-ray diffraction component analysis in the prior art, and typical sediment is analyzed in a microscopic mode and at least comprises grain size, porosity, tissue structure and the like. Then analyzing the recovered oil field well shaft under-scale corrosion experiment device to clean the sediments in the blind hole without the conducting wire, splitting along the center line of the blind hole with the conducting wire, and observing the appearance and the depth of the corrosion pit; and (3) testing the blind hole with the lead by using the electrochemical system in the prior art, analyzing the influence of under-deposit corrosion of the blind hole with the lead, summarizing and analyzing experimental data, and obtaining the degree of under-deposit corrosion and main reasons of the shaft of the block.
The technical scheme of the invention is provided with the lead 3, which is convenient for carrying out electrochemical rule test and can test the influence of the scale layers with different thicknesses in the blind hole on the corrosion current and the influence of the changes of other corrosion factors on the corrosion current.
The method is convenient to implement, truly reflects the corrosion and scaling environment of the oil field well bottom pipe column, and defines the pipe column corrosion scaling perforation mechanism, thereby providing targeted anticorrosion and antiscaling measures and slowing down the under-scale corrosion.
Example two:
the experimental device for the under-scale corrosion of the oil field shaft shown in the figure 1 is different from the first embodiment in that: the connecting hole 6 is a threaded hole, and the plug 5 is provided with a thread matched with the threaded hole; the screw hole 8 is a threaded hole of M5, and the diameter of the through hole 2 is 2 mm; the fixing piece is a nylon bolt 1, and the joint of the nylon bolt 1 and the lead 3 is sealed by sealant.
When in actual use, the connecting hole 6 and the plug 5 adopt the technical scheme, so that the plug 5 is more convenient to connect.
Screw hole 8 adopts M5's screw hole, can be convenient screw nylon bolt 1, convenient operation, and avoided wire 3 to drop in the experimentation and influence the effect of experiment. The joint of the nylon bolt 1 and the lead 3 is sealed by sealant, so that the corrosion damage of the joint of the nylon bolt 1 and the lead 3 caused by connection is avoided, and the accuracy of an experimental result is influenced.
The sealant in this embodiment is made of epoxy resin in the prior art.
Example three:
the experimental device for the under-deposit corrosion of the oil field well shaft shown in the figures 1 and 2 is different from the first embodiment in that: the body 4 is a cylindrical body consisting of a hollow pentagonal prism 9 and a hollow cylinder 10, and the inner side wall of the cylinder 10 is provided with threads; the blind holes provided with the screw holes 8 are first blind holes 7, and the rest are second blind holes 11; the first blind hole 7 and the second blind hole 11 are positioned on each edge surface of the outer side wall of the pentagonal prism 9.
When in actual use, body 4 adopts this technical scheme because every faceted pebble of pentaprism is the plane, is convenient for process the blind hole of the different degree of depth, and makes the blind hole distribute more rationally, makes the data of follow-up acquireing more comprehensive to the data that the analysis obtained are more scientific.
The pentagonal prism 9 is of a hollow structure, so that the other end of the wire 3 can be conveniently placed, and the influence of the other end of the wire 3 on a test result is avoided. The hollow cylinder 10 is a hollow structure, and is connected with a sieve tube at the lower part of the oil well pump for convenience.
Example four:
according to the experimental apparatus for the corrosion under the scale of the oil field shaft shown in fig. 1, the difference from the third embodiment is that: the first blind holes 7 and the second blind holes 11 are respectively in a group and are uniformly arranged along the radial direction of the pentagonal prism 9.
Preferably, the five first blind holes 7 have the same diameter and different depths; the five second blind holes 9 have the same diameter and different depths; the first blind hole 7 and the second blind hole 9 have the same diameter.
Preferably, the centers of the five blind holes in each group are in a common circle; the diameters of the first blind hole 7 and the second blind hole 9 are both 30mm, and the blind holes of the five prism surfaces are respectively 2mm, 4mm, 6mm, 8mm and 10mm in depth.
In practical use, the diameter of the blind hole 7 is 30mm, so that the screw 1 can be screwed in conveniently, and the diameter of the blind hole 11 is 30mm, so that sufficient scale can be accumulated for microscopic analysis. The function of the central co-circle is that five blind holes 11 can be simultaneously split along the central line by one-time machining, so that experimental research and data analysis are facilitated.
Example five:
according to the experimental apparatus for the corrosion under the scale of the oil field shaft shown in fig. 1, the difference from the third embodiment is that: the lead 3 is a thin copper wire with an insulating sheath, and the length of the lead 3 is 18-22 cm.
In practical use, the technical scheme is adopted for the lead 3, so that the effect of the lead 3 in the invention is fully reflected, the experimental cost is saved, and the real condition of the fouling substances of the well to be measured can be fully reflected.
Example six:
the experimental device for the under-scale corrosion of the oil field shaft shown in the figure 1 is different from the first embodiment in that: the plug 5 is made of polytetrafluoroethylene, and the body 4 is made of carbon steel.
When in actual use, the plug 5 is in threaded connection with the body 4, high salinity water and dirt in an oil well are prevented from entering the cavity of the body 4, and the lead 3 is prevented from being corroded and aged.
The plug 5 is made of polytetrafluoroethylene, so that the plug is not easy to corrode; the body 4 is made of carbon steel, so that the experiment is closer to the field reality, and the acquired experiment data is more real.
Example seven:
the use method of the oilfield shaft under-deposit corrosion experiment device comprises the following steps
The method comprises the following steps: connecting oil field shaft under-deposit corrosion experimental device
Respectively screwing nylon bolts 1 into a group of five blind holes 7 far away from the cylinder 10 on the body 4 and respectively connecting one ends of the wires 3, screwing the nylon bolts 1 after one ends of the wires 3 are firmly connected, then penetrating the other end of the wire 3 into an inner cavity of the pentagonal prism 9 through the through hole 2, binding the 5 wires together after all the 5 wires are penetrated, and screwing the plugs to plug 5; coating sealant on the joint of the nylon bolt 1 and the lead 3 and the outer surface of the through hole 2;
step two: down-hole of oil field shaft scale corrosion experimental device
Connecting and screwing the cylindrical internal thread part of the well shaft scale corrosion experiment device body 4 of the oil field connected in the step with a sieve tube at the lower part of an oil well pump, and putting the well shaft scale corrosion experiment device of the oil field into the bottom of the well shaft along with the oil well pump by using an oil pipe;
step three: experimental device for recovering corrosion under scale of oil field shaft
After the second step is finished and the well is hung for a preset period, taking back the oilfield shaft under-deposit corrosion experiment device from the well;
step four: the solid deposit was collected and analyzed
Analyzing the solid sediments with different thicknesses deposited in the first blind holes 7 with different depths on the recovered oil field shaft under-scale corrosion experiment device in the third step;
step five: analyzing recycled oil field well bore under-scale corrosion experiment device
Cleaning up the sediments in the second blind hole 11 without the conducting wire, splitting along the center line of the second blind hole 11, and observing the appearance and the depth of the corrosion pit; and (3) testing the first blind hole 7 with the lead by using an electrochemical system, analyzing the influence on the corrosion under the scale of the carbon steel, summarizing and analyzing experimental data, and obtaining the corrosion degree and reason under the scale of the shaft in the block.
The suspension preset period in the step three is more than 3 months.
The method comprises four steps of connecting an oil field shaft under-scale corrosion experiment device, descending a well, recovering the oil field shaft under-scale corrosion experiment device and collecting and analyzing solid sediments, and the recovered oil field shaft under-scale corrosion experiment device is used for completing the oil field shaft under-scale corrosion experiment. The method is convenient to implement, can truly reflect the corrosion and scaling environment of the bottom hole pipe column of the oil field, defines the pipe column corrosion and scaling perforation mechanism, adopts targeted anti-corrosion and anti-scaling measures and slows down the occurrence of under-scale corrosion.
The sealant in this embodiment is epoxy resin in the prior art.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
In the case of no conflict, a person skilled in the art may combine the related technical features in the above examples according to actual situations to achieve corresponding technical effects, and details of various combining situations are not described herein.
It should be noted that all the directional indications in the embodiments of the present invention are only used to explain the relative position relationship, the motion situation, and the like between the components in a certain posture, and if the certain posture is changed, the directional indication is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
The foregoing is illustrative of the preferred embodiments of the present invention, and the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides an oil field pit shaft dirt corrodes experimental apparatus down which characterized in that: comprises a body (4), a plug (5) and a lead (3); the body (4) is a hollow cylindrical body; one end of the body (4) is provided with a connecting hole (6), and the connecting hole (6) is connected with the plug block (5); the blind hole that has a plurality of different degree of depth is opened on body (4) lateral wall, wherein partly the through-hole (2) that the downthehole screw hole (8) of opening and communicate with body (4) inner chamber, has the mounting in screw hole (8), the mounting is fixed with the one end of wire (3), and the other end of wire (3) extends in the cavity of body (4) through-hole (2).
2. The oilfield wellbore sub-scale corrosion experimental apparatus of claim 1, wherein: the connecting hole (6) is a threaded hole, and the plug (5) is provided with a thread matched with the threaded hole; the screw hole (8) is a threaded hole of M5, and the diameter of the through hole (2) is 2 mm; the fixing piece is a nylon bolt (1), and the joint of the nylon bolt (1) and the lead (3) is sealed by sealant.
3. The oilfield wellbore sub-scale corrosion experimental apparatus of claim 1, wherein: the body (4) is a cylindrical body consisting of a hollow pentagonal prism (9) and a hollow cylinder (10), and the inner side wall of the cylinder (10) is provided with threads; the blind hole provided with the screw hole (8) is a first blind hole (7), and the rest are second blind holes (11); the first blind hole (7) and the second blind hole (11) are located on each edge surface of the outer side wall of the pentagonal prism (9).
4. The oilfield wellbore sub-scale corrosion experimental apparatus of claim 3, wherein: the first blind holes (7) and the second blind holes (11) are respectively arranged in a group and uniformly arranged along the radial direction of the pentagonal prism (9).
5. The oilfield wellbore sub-scale corrosion experimental apparatus of claim 3 or 4, wherein: the five first blind holes (7) have the same diameter and different depths; the five second blind holes (9) have the same diameter and different depths; the diameters of the first blind hole (7) and the second blind hole (9) are the same.
6. The oilfield wellbore sub-scale corrosion experimental apparatus of claim 4 or 5, wherein: the centers of the five blind holes in each group are in a common circle; the diameters of the first blind hole (7) and the second blind hole (9) are both 30mm, and the blind holes of the five prism surfaces are respectively 2mm, 4mm, 6mm, 8mm and 10mm in depth.
7. The oilfield wellbore sub-scale corrosion experimental apparatus of claim 1, wherein: the lead (3) is a thin copper wire with an insulating sheath, and the length of the lead (3) is 18-22 cm.
8. The oilfield wellbore sub-scale corrosion experimental apparatus of claim 1, wherein: the plug (5) is processed by polytetrafluoroethylene, and the body (4) is processed by carbon steel.
9. The use method of the oilfield wellbore under-scale corrosion experiment device is characterized in that: comprises the following steps
The method comprises the following steps: connecting oil field shaft under-deposit corrosion experimental device
Respectively screwing nylon bolts (1) into a group of five blind holes (7) far away from the cylinder (10) on the body (4) and respectively connecting one ends of the wires (3), screwing the nylon bolts (1) after one ends of the wires (3) are firmly connected, then penetrating the other end of the wire (3) into the inner cavity of the pentagonal prism (9) through the through hole (2), binding the five wires together after all 5 wires are penetrated, and screwing the plug to seal the plug (5); the joint of the nylon bolt (1) and the lead (3) and the outer surface of the through hole (2) are coated with sealant;
step two: down-hole of oil field shaft scale corrosion experimental device
Connecting and screwing the cylindrical internal thread part of the well shaft scale corrosion experiment device body (4) of the oil field connected in the step with a sieve tube at the lower part of an oil well pump, and putting the well shaft scale corrosion experiment device of the oil field into the bottom of the well shaft along with the oil well pump by using an oil pipe;
step three: experimental device for recovering corrosion under scale of oil field shaft
After the second step is finished and the well is hung for a preset period, taking back the oilfield shaft under-deposit corrosion experiment device from the well;
step four: the solid deposit was collected and analyzed
Analyzing the solid sediments with different thicknesses deposited in the first blind holes (7) with different depths on the oilfield shaft under-scale corrosion experiment device recovered from the step three;
step five: analyzing recycled oil field well bore under-scale corrosion experiment device
Cleaning up sediments in the second blind hole (11) without the conducting wire, splitting along the center line of the second blind hole (11), and observing the appearance and the depth of the corrosion pit; and (3) testing the first blind hole (7) with the lead by using an electrochemical system, analyzing the influence on the corrosion under the scale of the carbon steel, summarizing and analyzing experimental data, and obtaining the corrosion degree and reason under the scale of the shaft in the block.
10. The use method of the oilfield wellbore sub-scale corrosion experimental apparatus of claim 9, wherein: the suspension preset period in the step three is more than 3 months.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113669049A (en) * | 2021-08-24 | 2021-11-19 | 重庆科技学院 | Application method of water injection well full-well tube column dissolved oxygen corrosion simulation device |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113669049A (en) * | 2021-08-24 | 2021-11-19 | 重庆科技学院 | Application method of water injection well full-well tube column dissolved oxygen corrosion simulation device |
| CN113669049B (en) * | 2021-08-24 | 2022-03-08 | 重庆科技学院 | Application method of water injection well full-well tube column dissolved oxygen corrosion simulation device |
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