CN112179832A - Indoor simulation experiment device and method for dynamic erosion corrosion of carbon dioxide to cement - Google Patents
Indoor simulation experiment device and method for dynamic erosion corrosion of carbon dioxide to cement Download PDFInfo
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- CN112179832A CN112179832A CN201910602344.2A CN201910602344A CN112179832A CN 112179832 A CN112179832 A CN 112179832A CN 201910602344 A CN201910602344 A CN 201910602344A CN 112179832 A CN112179832 A CN 112179832A
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- 239000004568 cement Substances 0.000 title claims abstract description 130
- 238000005260 corrosion Methods 0.000 title claims abstract description 86
- 230000007797 corrosion Effects 0.000 title claims abstract description 76
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 43
- 238000004088 simulation Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000003628 erosive effect Effects 0.000 title claims abstract description 18
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 57
- 238000010438 heat treatment Methods 0.000 claims abstract description 46
- 238000012360 testing method Methods 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000008398 formation water Substances 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 15
- 238000009991 scouring Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims description 37
- 238000006073 displacement reaction Methods 0.000 claims description 33
- 238000007789 sealing Methods 0.000 claims description 17
- 239000004575 stone Substances 0.000 claims description 14
- 238000002474 experimental method Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000013401 experimental design Methods 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 abstract description 22
- 230000002378 acidificating effect Effects 0.000 abstract description 15
- 230000008878 coupling Effects 0.000 abstract description 7
- 238000010168 coupling process Methods 0.000 abstract description 7
- 238000005859 coupling reaction Methods 0.000 abstract description 7
- 150000002500 ions Chemical class 0.000 description 8
- 239000002253 acid Substances 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 239000003129 oil well Substances 0.000 description 5
- 239000003929 acidic solution Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000009933 burial Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Classifications
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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
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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
- G01N17/002—Test chambers
Abstract
The invention discloses an indoor simulation experiment device and method for dynamic erosion corrosion of carbon dioxide to cement. The device includes: reaction vessel, flow pump, carbonated water storage tank, CO2Gas cylinders and formation water sources; the CO is2CO supplied by gas cylinders and formation water source2And formation water are mixed in the carbonated water storage tank and then conveyed to the reaction vessel through a flow pump; the reaction vessel includes: two symmetrically arranged heating plates which can move relatively; the two fixing clamps which are fixedly connected to the opposite inner sides of the two heating plates respectively are used for fixedly mounting the cement test piece, and the power device is used for driving the heating plates to move. The indoor simulation experiment device can realize dynamic update of the underground fluid, can reflect the process of flow scouring and corrosion coupling of the acidic fluid along the cementing surface containing the microcracks and the cement body, and is more suitable for the condition that the underground cement is subjected to CO2The true condition of corrosion.
Description
Technical Field
The invention relates to the technical field of shaft integrity evaluation, in particular to an indoor simulation experiment device and method for dynamic erosion corrosion of carbon dioxide to cement.
Background
High content of CO2Gas reservoir mining and CO2The well cementation cement containing CO can be confronted in the oil displacement and burial process2The corrosion of acidic fluids. Cement and CO2After the acid fluid contacts, the microscopic material composition and the microscopic structure of the acid fluid are changed, so that the cement structure is loosened and internal cracks are generated, the integrity of a well bore is failed, and oil gas or CO is generated2Leaks along the shaft and enters an upper aquifer and a well mouth to pollute an underground water layer and form an annular pressure phenomenon, thereby causing huge economic loss and potential safety hazard and influencing high CO content2Production of oil and gas reservoirs and CO2Application of buried storage and oil displacement technology.
CO2The corrosion to cement is influenced by multiple factors such as experiment temperature, ion concentration, pressure, original permeability of cement, fluid property, cement type and the like, so that the corrosion rules measured under different experiment conditions have larger difference. Kutchko, Barlet et al performed CO at various pressures, temperatures, reaction fluid properties, and the like2The corrosion test of G-grade and H-grade cement shows that the corrosion laws are different by hundreds of times, which shows that different reaction conditions are opposite to corrosionThe rate of erosion has a large effect. CO22Corrosion of oil well cement is unavoidable, however due to the influence of corrosive conditions, CO2The results of corrosion experiments on oil well cement are very different, so that CO cannot be accurately evaluated2The influence degree of corrosion on the oil well cement performance is easy to light or exaggerate CO2The damage to cement corrosion increases the extra cost of anti-corrosion measures and the hidden trouble of safe production. Therefore, to evaluate CO more accurately2For the corrosion rule and degree of cement, the development of CO capable of truly reflecting the characteristics of underground environment is required2Indoor simulation experiment device of corrosion cement.
Existing CO2The indoor simulation experiment device for well cementation cement corrosion is mainly divided into the following two types:
(1) static corrosion simulation experiment device
The experimental device can simulate CO in static environment2The corrosion to cement, such as Chinese patent "a high temperature and high pressure cement stone corrosion tester" (CN 102841048A). The device places a cement test piece in a reaction kettle containing formation water, and injects CO into the reaction kettle2And (5) heating and pressurizing the gas to finish the simulation of the underground corrosion environment. However, most of the experimental devices adopt a closed structure, the acidic fluid in the reaction device cannot be updated in time, and the acidic fluid contains CO2When the acidic liquid corrodes cement, the ion concentration of the liquid per se can be changed, and the change of the ion concentration of the acidic liquid can restrict the progress of corrosion reaction. As the corrosion time is prolonged, the corrosion rate is slower and slower due to the influence of the ion concentration, and the actual stratum has sufficient CO content2CO experimentally determined for acidic liquids2The corrosion rate to cement is much lower. CO simulated by such devices2The corrosion process to cement is different from the actual condition under the well.
(2) Dynamic corrosion simulation experiment device
The experimental device can realize the CO content2The continuous update of the acidic liquid, as in the Chinese patent "Experimental facility and method for simulating the corrosion process of well cementation cement sheath in the stratum" (CN108593533A). The device realizes dynamic update of the acidic fluid in the reaction vessel by continuously injecting the acidic fluid into the reaction vessel, and is more in line with actual underground characteristics compared with a static corrosion simulation experiment device. However, the experimental device has the following defects:
1) the patent CN108593533A realizes dynamic renewal of acidic fluid by arranging more spiral liquid dividing holes on the cement surface, which will form more local pitting on the cement surface near the liquid dividing holes, and is not in accordance with the feature that the underground fluid flows uniformly from the inlet along the cement surface under the action of pressure difference to corrode; meanwhile, the ion concentration of the acidic solution flowing out of the spiral liquid-separating hole along the flowing direction is unchanged, so that the characteristic that the ion concentration of the acidic solution is continuously changed in the flowing process along with the progress of corrosion reaction in the underground environment cannot be reflected;
2) from CO2The corrosion process of cement is known, CO2In the corrosion process of a cementing surface and a cement body containing the microcracks, a compact expansive corrosion product calcium carbonate is formed on the surface of the cement in the initial stage, and if the flow rate of an acid solution flowing through the microcracks is low and the corrosion product cannot be carried away by the scouring action of a fluid, the expansive corrosion product calcium carbonate can fill the microcrack space, so that the porosity and the flow conductivity of the microcracks are greatly reduced, the corrosion rate is reduced at the moment, and the annular sealing capacity is improved; if the flow rate of the acidic solution is high, the flow scouring action of the acidic fluid can carry away calcium carbonate serving as a corrosion product on the surface of cement, the corrosion rate is obviously accelerated, and CO is generated2The effects of corrosion on wellbore integrity are of sufficient importance. The flow velocity of the acid solution is not only influenced by the pressure difference between two ends, but also related to the size of the microcrack, and the existing simulation experiment device can not realize the CO content2The acidic solution is used for simulating the dynamic erosion corrosion of the microcracks in different gaps.
High content of CO2Gas reservoir mining and CO2The corrosion of cement in the oil displacement and burial process is inevitable, and in order to truly evaluate CO2For the corrosion degree of cement, a simulation experiment device which is closer to the actual underground condition needs to be provided. The invention providesProvides a process which not only can realize the dynamic update of the underground fluid, but also can reflect the flowing scouring and corrosion coupling of the acid fluid along the cementing surface containing the microcracks and the cement body, and more conforms to the condition that the underground cement is subjected to CO2True condition of corrosion, accurate evaluation of CO2The corrosion rule of well cementing cement in the environment and the influence degree of the corrosion rule on the integrity of a shaft guide the CO prevention of oil well cement2Corrosion design and annulus cement integrity remediation measures to mitigate CO of oil well cement2Corrosion is a hazard to safety production.
Disclosure of Invention
The invention aims to provide an indoor simulation experiment device and method for dynamic erosion corrosion of carbon dioxide on cement. The CO is2The indoor simulation experiment device for dynamic erosion corrosion of cement can realize dynamic update of underground fluid, can reflect the process of flow erosion and corrosion coupling of acidic fluid along a cementing surface containing microcracks and a cement body, and is more suitable for the condition that the underground cement is subjected to CO2The true condition of corrosion.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an indoor simulation experiment device for dynamic erosion corrosion of carbon dioxide to cement, which comprises: reaction vessel, flow pump, carbonated water storage tank, CO2Gas cylinders and formation water sources;
the CO is2CO supplied by gas cylinders and formation water source2And formation water are mixed in the carbonated water storage tank and then conveyed to the reaction vessel through a flow pump;
the reaction vessel includes: two symmetrically arranged heating plates which can move relatively; the two fixing clamps which are fixedly connected to the opposite inner sides of the two heating plates respectively are used for fixedly mounting the cement test piece, and the power device is used for driving the heating plates to move.
The cement test pieces are symmetrically arranged in the reaction container, the space between the two cement test pieces represents the size of the microcrack, and the cement test pieces are dynamically washed by the flow pump to reflect the acid flowThe process of coupling the flowing scouring and the corrosion of the body along the cementing surface containing the microcracks and the cement body is more suitable for the condition that the underground cement is subjected to CO2The true condition of corrosion.
Preferably, the reaction vessel comprises: the sealing cover is connected with the body in a sealing mode through a sealing bolt;
the body is provided with a liquid inlet hole and a liquid outlet hole, and the liquid inlet hole and the liquid outlet hole are both provided with one-way valves; the liquid inlet hole is connected with the flow pump.
Preferably, the liquid inlet hole and the liquid outlet hole are located on two opposite sides of the body, the liquid inlet hole is lower than the cement stone test piece, and the liquid outlet hole is higher than the cement stone test piece.
Preferably, a displacement sensor for monitoring the moving displacement of the heating plate is included in the reaction container, so that the distance between the cement stone test pieces is determined; the body is provided with a control panel for controlling and displaying the heating temperature of the heating plate and controlling the power device to drive the heating plate to move, so that the distance between the cement stone test pieces is adjusted, and meanwhile, the displacement data monitored by the displacement sensor is displayed.
Preferably, the power device comprises a motor and a mechanical arm, and the motor drives the mechanical arm to drive the heating plate to move; and the displacement sensor monitors the displacement of the power arm, namely the displacement of the heating plate.
Preferably, power device includes motor and two arms, and every arm is connected a hot plate, motor drive the arm drives the hot plate that corresponds and removes.
Preferably, the reaction vessel also comprises a lower partition plate;
the reaction container is internally provided with a heating plate, a lower clapboard, a displacement sensor and a motor from top to bottom in sequence. Wherein, the lower baffle is used for obstructing the corrosion of the upper acidic fluid to the motor and the displacement sensor.
Preferably, the surface of one side of the heating plate fixedly connected with the fixing clamp is coated with an anti-corrosion sealing coating.
Preferably, the reaction vessel, flow pump, carbonated water storage tank, CO2The gas cylinder is connected with the formation water source through an anti-corrosion high-pressure lead.
Preferably, the fixing clip comprises an upper portion, a lower portion and a fastening bolt connecting the upper portion and the lower portion; the lower part is fixedly connected to the heating plate, and the cement test piece is fixedly mounted by screwing up a fastening bolt.
Preferably, the surface of one side of the upper part and the lower part contacting the cement test piece is rough and serrated.
Preferably, the shape of the cement test piece is a cuboid.
The invention also provides a method for carrying out CO by utilizing the indoor simulation experiment device2The experimental method for dynamic erosion corrosion of cement comprises the following steps:
s1, manufacturing two cement samples;
s2, mounting and fixing the cement test piece on the fixing clamp;
s3, driving the heating plate to move through a power device, so that the distance between the two cement samples meets the experimental requirements;
s4, sealing the reaction vessel, and filling the reaction vessel, a flow pump, a carbonated water storage tank, and CO2The gas cylinder is connected with a formation water source;
s5, waiting for CO2After the formation water and the formation water are fully dissolved in a carbonated water storage tank, the carbonated water is injected into the reaction container by using a flow pump, and the heating plate heats the interior of the reaction container to reach the temperature and the pressure required by an experiment;
s6, injecting carbonated water with a designed flow into the reaction container by using a flow pump, and dynamically scouring the surface of the cement test piece;
and S7, stopping injecting the carbonated water and heating after the time required by the experimental design is reached, taking out the cement sample after the pressure is released, and measuring the corrosion degree of the cement at different positions.
Preferably, the shape of the cement sample is a cuboid, and the end face of the cement sample is required to be parallel and smooth.
Preferably, in S3, the power device includes a motor and a mechanical arm, and the motor drives the mechanical arm to drive the heating plate to move a set distance, so as to drive the cement samples to move a corresponding set distance, and finally, the distance between the cement samples reaches the experimental requirements.
More preferably, S2 further includes: measuring the distance between the two cement test pieces by using a vernier caliper, and then controlling the motor to drive the mechanical arm to drive the heating plate to move for a set distance so as to drive the cement test pieces to move for a corresponding set distance, so that the distance between the cement test pieces can meet the experimental requirements finally; and monitoring the moving displacement of the mechanical arm by a displacement sensor in the moving process.
The invention has the following beneficial effects:
1. the invention realizes the continuous update of the carbonated water in the reaction container and the stability of the ion concentration by the design of the liquid inlet and the liquid outlet, and conforms to the source characteristic that the underground sufficient carbonated water has corrosive cement;
2. according to the invention, through the design of the space between two cement samples, the uniform flow of carbonated water along the cement surface can be ensured, the uniform corrosion of the cement surface along the flow direction is realized, and the cement surface contains CO underground2The corrosion mode of the acidic water is consistent with that of cement;
3. according to the invention, through the design of the space between two cement samples, the corrosion process of a cementing surface containing micro cracks and a cement body can be simulated, and the interface corrosion characteristics of the underground well cementation cement are met;
4. the invention drives the mechanical arm to move by the motor, adjusts the distance between the two cement samples by using the displacement sensor, can realize the dynamic coupling of flow scouring and corrosion under the conditions of different microcrack sizes and flow rates, and realizes the CO dynamic coupling under the conditions of different microcrack sizes and flow rates2The simulation of the dynamic erosion corrosion of the cement can simulate the underground corrosion environment of the well cementation cement more truly.
Drawings
FIG. 1 is a diagram of CO in a preferred embodiment of the present invention2The overall structure schematic diagram of the indoor simulation experiment device for dynamic erosion corrosion of cement.
FIG. 2 is a view showing the internal structure of a reaction vessel in a preferred embodiment of the present invention.
Description of reference numerals:
1-a reaction vessel; 2-a control panel; 3-sealing the cover; 4-sealing bolts; 5-liquid outlet holes; 6-liquid inlet hole; 7-a flow pump; 8-a carbonated water storage tank; 9-CO2A gas cylinder; 10-formation water source; 11-a motor; 12-a displacement sensor; 13-heating plate; 14-a lower baffle; 15-a mechanical arm; 16-an anti-corrosion coating; 17-a retaining clip; 18-a cement stone test piece; 19-fastening the bolt.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
The present invention provides a preferred embodiment for illustration. As shown in FIG. 1, the CO2The indoor simulation experiment device for the dynamic erosion corrosion of the set cement comprises: reaction vessel 1, flow pump 7, carbonated water storage tank 8, CO2The gas cylinder 9 is connected with a stratum water source 10 through an anti-corrosion high-pressure diversion line. A control panel 2 is arranged on the reaction vessel 1, a sealing cover 3 is arranged on the reaction vessel 1, and sealing is realized by fastening a sealing bolt 4; two sides of the reaction container 1 are provided with a liquid outlet 5 and a liquid inlet 6, one-way valves are respectively arranged on the liquid outlet 5 and the liquid inlet 6, a flow pump 7 is connected with the reaction container 1, the flow of acid fluid for washing a cement stone test piece can be adjusted by the flow pump 7, the other side of the flow pump 7 is connected with a carbonated water storage tank 8, and the carbonated water storage tank 8 is CO2Sufficient dissolution provides space, enough carbonated water can be stored at the same time, guarantee is provided for large-flow erosion corrosion experiment, and CO2CO delivered by gas cylinder 9 and formation water source 102And the formation water is contacted and mixed in the anticorrosive high-pressure diversion line and then is injected into the carbonated water storage tank 8.
As shown in fig. 2, a motor 11 is disposed at the bottom of the reaction container 1, the motor 11 can drive the mechanical arm 15 to move, so that the heating plate 13 connected to the mechanical arm 15 is displaced, an anti-corrosion coating 16 is coated on the heating plate 13, the displacement sensor 12 is used to capture displacement information of the mechanical arm, the control panel 2 on the reaction container 1 is used to set working parameters of the motor 11 and the heating plate 13, and simultaneously, displacement conditions captured by the displacement sensor 12 and temperature information in the reaction container can be read. The lower part of the fixing clamp 17 is mounted on the heating plate 13, the upper part is connected with the lower part through a fastening bolt 19, and the cement test piece 18 can be fixed by tightening the fastening bolt 19.
CO as described above2The simulation method of the indoor simulation experiment device for the dynamic erosion corrosion of the set cement comprises the following steps:
and S1, manufacturing two cement stone samples 18, wherein the cement stone samples are required to be cuboid, and the end surfaces of the cement stone samples are parallel and smooth.
S2, placing the cemented rock test piece on the fixing clamp 17, tightening the fastening bolt 19 to fix the two cemented rock test pieces 18, and measuring the distance between the two test pieces by using a vernier caliper.
S3, operating the control panel 2 on the reaction container 1 to enable the motor 11 to work, setting the displacement distance of the mechanical arm 15, and driving the heating plate 13 to move for a specified distance by the mechanical arm 15, so that the distance between the cement stone samples 18 reaches the experimental requirements and micro cracks are simulated; as is readily understood by those skilled in the art, the distance between the two test pieces can be finally obtained by adding or subtracting the displacement of the two mechanical arms from the measured distance between the two test pieces; the movement away from each other is plus and the movement closer to each other is minus.
S4, fastening the sealing cover 3 on the reaction vessel 1, and fastening the reaction vessel 1, the flow pump 7, the carbonated water storage tank 8 and CO through an anticorrosive high-pressure diversion line2The gas cylinder 9 and the formation water source 10 are connected.
S5, waiting for CO2After the formation water and the formation water are sufficiently dissolved in the carbonated water storage tank 8, the flow pump 7 is turned on, the carbonated water is injected into the reaction vessel 1 at a constant flow rate, and the interior of the reaction vessel 1 is heated through the control panel 2 to reach the temperature and the pressure required by the experiment.
S6, injecting carbonated water with a designed flow into the reaction container 1 from the liquid inlet 6 by using the flow pump 7, and simultaneously opening the liquid outlet 5 to realize dynamic update of the fluid and realize flowing scouring on the cement surface.
And S7, after the time required by the experimental design is reached, closing the flow pump 7, taking out the cement stone 18 sample, measuring the corrosion degree of the cement at different positions, and analyzing the experimental result.
According to the method, the corrosion process of the cementing surface containing the microcracks and the cement body is simulated by utilizing the space between the two cement stone test pieces, and the interface corrosion characteristics of the underground well cementation cement are met. The design of the liquid inlet and the liquid outlet can dynamically simulate the scouring process, thus realizing the continuous update of the carbonated water in the reaction container and the stability of the ion concentration, and conforming to the source characteristic that the underground sufficient carbonated water has corrosive cement. The motor drives the mechanical arm to move, the displacement sensor is used for adjusting the distance between the two cement samples, dynamic coupling of flowing scouring and corrosion under the conditions of different microcrack sizes and flow rates can be realized, the simulation of CO2 on the dynamic scouring corrosion of cement under the conditions of different microcrack sizes and flow rates is realized, and the underground corrosion environment of well-cementing cement is simulated more truly.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (16)
1. The utility model provides a carbon dioxide is to indoor simulation experiment device of cement dynamic erosion corrosion which characterized in that, this indoor simulation experiment device includes: reaction vessel, flow pump, carbonated water storage tank, CO2Gas cylinders and formation water sources;
the CO is2CO supplied by gas cylinders and formation water source2And formation water are mixed in the carbonated water storage tank and then conveyed to the reaction vessel through a flow pump;
the reaction vessel includes: two symmetrically arranged heating plates which can move relatively; the two fixing clamps which are fixedly connected to the opposite inner sides of the two heating plates respectively are used for fixedly mounting the cement test piece, and the power device is used for driving the heating plates to move.
2. The indoor simulation experiment device according to claim 1, wherein the reaction vessel comprises: the sealing cover is connected with the body in a sealing mode through a sealing bolt;
the body is provided with a liquid inlet hole and a liquid outlet hole, and the liquid inlet hole and the liquid outlet hole are both provided with one-way valves; the liquid inlet hole is connected with the flow pump.
3. The indoor simulation experiment device of claim 2, wherein the liquid inlet hole and the liquid outlet hole are located on two opposite sides of the body, the liquid inlet hole is lower than the set cement test piece, and the liquid outlet hole is higher than the set cement test piece.
4. The indoor simulation experiment device of claim 3, wherein a displacement sensor for monitoring the movement displacement of the heating plate is included in the reaction container, so as to determine the distance between the set cement test pieces; the body is provided with a control panel for controlling and displaying the heating temperature of the heating plate and controlling the power device to drive the heating plate to move, so that the distance between the cement stone test pieces is adjusted, and meanwhile, the displacement data monitored by the displacement sensor is displayed.
5. The indoor simulation experiment device according to claim 4, wherein the power device comprises a motor and a mechanical arm, the motor drives the mechanical arm to drive the heating plate to move; and the displacement sensor monitors the displacement of the power arm, namely the displacement of the heating plate.
6. The indoor simulation experiment device according to claim 5, wherein the power device comprises a motor and two mechanical arms, each mechanical arm is connected with a heating plate, and the motor drives the mechanical arms to drive the corresponding heating plates to move.
7. The indoor simulation experiment device according to claim 6, wherein the reaction vessel further comprises a lower partition plate therein;
the reaction container is internally provided with a heating plate, a lower clapboard, a displacement sensor and a motor from top to bottom in sequence.
8. The indoor simulation experiment device according to any one of claims 1 to 7, wherein an anticorrosive sealing coating is coated on one side surface of the heating plate to which the fixing clip is fixedly connected.
9. The laboratory simulation experimental device of claim 8, wherein the reaction vessel, the flow pump, the carbonated water storage tank, the CO2The gas cylinder is connected with the formation water source through an anti-corrosion high-pressure lead.
10. The indoor simulation experiment device according to any one of claims 1 to 7, wherein the fixing clip comprises an upper portion, a lower portion, and a fastening bolt connecting the upper portion and the lower portion; the lower part is fixedly connected to the heating plate, and the cement test piece is fixedly mounted by screwing up a fastening bolt.
11. The indoor simulation experiment device according to claim 10, wherein the upper and lower portions have a rough serrated surface on one side contacting the cement specimen.
12. The indoor simulation experiment device according to claim 10, wherein the cement test piece is in the shape of a rectangular parallelepiped.
13. Use of the laboratory simulation test device according to any one of claims 1 to 12 for CO2The experimental method for dynamic erosion corrosion of cement is characterized by comprising the following steps:
s1, manufacturing two cement samples;
s2, mounting and fixing the cement test piece on the fixing clamp;
s3, driving the heating plate to move through a power device, so that the distance between the two cement samples meets the experimental requirements;
s4, sealing the reaction vessel, and filling the reaction vessel, a flow pump, a carbonated water storage tank, and CO2The gas cylinder is connected with a formation water source;
s5, waiting for CO2After the formation water and the formation water are fully dissolved in a carbonated water storage tank, the carbonated water is injected into the reaction container by using a flow pump, and the heating plate heats the interior of the reaction container to reach the temperature and the pressure required by an experiment;
s6, injecting carbonated water with a designed flow into the reaction container by using a flow pump, and dynamically scouring the surface of the cement test piece;
and S7, stopping injecting the carbonated water and heating after the time required by the experimental design is reached, taking out the cement sample after the pressure is released, and measuring the corrosion degree of the cement at different positions.
14. The experimental method as claimed in claim 13, wherein the shape of the cement sample is cuboid, and the end face of the cement sample is required to be parallel and smooth.
15. The experimental method of claim 14, wherein in S3, the power device comprises a motor and a mechanical arm, and the motor drives the mechanical arm to move the heating plate by a set distance, so as to drive the cement samples to move by a corresponding set distance, and finally, the distance between the cement samples reaches the experimental requirement.
16. The experimental method of claim 15, wherein S2 further comprises: measuring the distance between the two cement test pieces by using a vernier caliper, and then controlling the motor to drive the mechanical arm to drive the heating plate to move for a set distance so as to drive the cement test pieces to move for a corresponding set distance, so that the distance between the cement test pieces can meet the experimental requirements finally; and monitoring the moving displacement of the mechanical arm by a displacement sensor in the moving process.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1808098A (en) * | 2005-12-30 | 2006-07-26 | 大连海事大学 | Temperature controllable fluid dynamic simulation test device |
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