CN111089949B - Carbonate rock intergrowth period cementing action analogue means - Google Patents
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- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 119
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- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 6
- 238000011065 in-situ storage Methods 0.000 claims description 4
- 239000011148 porous material Substances 0.000 abstract description 18
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- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a carbonate rock contemporaneous cementation simulation device. The invention provides a carbonate rock contemporaneous cementation simulation device which comprises a bipolar plunger pump and saturated CO 2 A pressure vessel and a precipitation reaction unit; wherein the bipolar plunger pump is connected to the saturated CO 2 Pressure vessel of said saturated CO 2 The pressure container is connected with the precipitation reaction unit. The carbonate rock contemporaneous cementation simulation device provided by the invention can simulate the cementation process between carbonate rock and formation water under the earth surface seepage zone and subsurface zone environments, and is beneficial to experimental study of carbonate rock contemporaneous cementation generation control factors, cement styles and pore preservation mechanisms.
Description
Technical Field
The invention relates to the technical field of petroleum geology. And more particularly, to a device for simulating the contemporaneous cementation of carbonate rocks.
Background
The marine carbonate rock strata system oil and gas resource amount of China accounts for more than 40% of the total oil and gas resource amount of China, and is a main field for strategic succession of oil and gas resources. However, the marine carbonate rock in China has the characteristics of old times, deep burial, complex burial and the like, and the problems of high prediction difficulty, high exploration cost and the like are caused. How to reasonably know the formation mechanism of scale pores of the carbonate rock is a key for judging whether the rock stratum has the oil-gas storage condition or not and a key for improving the oil-gas exploration efficiency.
Researches show that after the carbonate rock is subjected to compaction, cementation and recrystallization after deposition, few primary pores are left, and secondary pores become important storage spaces. In order to solve the problem that the research on carbonate rock pore formation mainly depends on geological inference, the development of carbonate rock pore evolution simulation experiment is gradually emphasized.
At present, geologists emphasize the action of corrosion and pore enlargement in the process of carbonate rock formation, and develops a plurality of experimental devices suitable for carbonate rock corrosion simulation. For example, by means of a diagenesis simulation experiment device (patent of invention ZL201110271800.3) and a carbonate rock corrosion effect and corrosion effect analysis method (patent of invention ZL201410717934.7), carbonate rock corrosion simulation under different temperatures and pressures is carried out by adopting an experiment mode that fluid moves in pores in rocks under overpressure, and shallow burial (low-temperature environment) which is more favorable for formation of a pore-dissolving (cavern) reservoir and pore formationThe structure and the homogeneity thereof control the knowledge of the distribution pattern of the pores; by utilizing the diamond cavity pressing technology (Yangyun, recognitions of deep corrosion of carbonate rock based on in-situ observation of simulation experiment), the in-situ observation simulation experiment from room temperature (23.8 ℃) to 260 ℃ is carried out, and HCO in the solution is detected by virtue of Raman spectrum 3 - The monotonous decrease as the experiment progresses, from which it is speculated that as the depth of burial increases, the carbonate rock as a whole behaves as sediment and cement.
The experiments show that the scale corrosion action of the carbonate rock mainly occurs in a near-surface low-temperature environment, and the precipitation action is mainly used in a medium-deep buried environment, so that the research on the cementation action in the diagenesis process of the carbonate rock is very important. Furthermore, in combination with modern carbonate sedimentology studies, the massive disappearance of primary porosity occurs during early diagenesis of the sediment, when burial is shallow, and cementation and compaction are the main causes of pore disappearance. It can be said that the contemporaneous cementation plays an important role in determining the diagenetic and pore preservation of carbonate rocks. However, because an experimental device for simulating the cementation of the carbonate sediments in the same growth period is lacked, the precipitation of the carbonate rocks can be inferred only by means of a corrosion test, so that the problems of the cementation mechanism, control factors, the type of the cement and the like of the carbonate rocks in the same growth period are not solved, and the reasonable understanding of the pore preservation mechanism of the carbonate rocks in scale is limited.
Therefore, the invention provides a carbonate rock contemporaneous cementation simulation device, which aims to solve the problems.
Disclosure of Invention
The invention aims to provide a carbonate rock contemporaneous cementation simulation device. The device is used for simulating the chemical precipitation process close to the surface seepage zone and the subsurface zone environment, can visually and quantitatively analyze the production state of the cementing material in the same period of the carbonate rock and control factors of the cementing action in the same period of the carbonate rock, and aims to solve the problems of a carbonate rock early diagenesis period pore preservation mechanism and scale pore distribution prediction.
In order to achieve the purpose, the invention adopts the following technical scheme:
carbonate rockThe cementing action simulator in the same growth period comprises a bipolar plunger pump and saturated CO 2 A pressure vessel and a precipitation reaction unit;
the bipolar plunger pump is connected with the saturated CO 2 Pressure vessel of said saturated CO 2 The pressure container is connected with the precipitation reaction unit;
said saturated CO 2 The pressure vessel is used for preparing a reaction solution which contains certain CO 2 A reaction solution of a partial pressure gas;
the bipolar plunger pump is used for providing the pressure required by the device, including providing saturated CO 2 The pressure of the reaction solution injected into the reaction unit in the pressure vessel and the pressure required to simulate the formation pressure are provided by compressing the reaction solution;
the precipitation reaction unit is used for placing the carbonate rock A in the surface seepage zone and the carbonate rock in the surface subsurface seepage zone, and the carbonate rock A in the surface seepage zone and the carbonate rock in the surface subsurface seepage zone in the precipitation reaction unit are reacted with the fluid injected into the precipitation reaction unit to generate precipitation reaction generated liquid; the precipitation reaction unit is used for simulating precipitation reactions between the carbonate rocks in the surface seepage zone and the carbonate rocks in the surface subsurface zone and formation water respectively.
Preferably, the carbonate rock contemporaneous cementation simulation device further comprises an erosion reaction unit; the corrosion reaction unit is arranged on the saturated CO 2 Between the pressure vessel and the precipitation reaction unit;
the corrosion reaction unit is used for placing the carbonate rock B of the surface seepage zone, and the carbonate rock B of the surface seepage zone in the corrosion reaction unit reacts with the fluid injected into the corrosion reaction unit to generate corrosion reaction generated liquid; the corrosion reaction unit is used for simulating the corrosion reaction between the carbonate rock in the surface seepage zone and the formation water.
Preferably, the device for simulating cementing action in the same growing period of carbonate rock further comprises a first sampler, wherein the first sampler is connected with the corrosion reaction unit and is used for acquiring corrosion reaction generated liquid in the corrosion reaction unit.
Preferably, the carbonate rock contemporaneous cementation simulation device further comprises a second sampler, wherein the second sampler is connected with the precipitation reaction unit and is used for obtaining a precipitation reaction generated liquid in the precipitation reaction unit.
Preferably, the carbonate rock contemporaneous cementation simulation device further comprises an air pump, wherein the air pump is connected with the precipitation reaction unit and used for injecting air into the carbonate rock A in the surface seepage zone in the precipitation reaction unit so as to realize the association between atmospheric water, surface water and underground water and carry out water exchange.
Preferably, the carbonate rock contemporaneous cementation simulation device further comprises CO 2 Gas cylinder of said CO 2 Gas cylinder and said saturated CO 2 Pressure vessel connection for saturated CO 2 Pressure vessel supplying CO 2 Gas to further regulate and control CO in the reaction solution 2 The partial pressure of the gas.
Preferably, the carbonate rock in-growth stage cementation simulation device further comprises a solution container, wherein the solution container is connected with the bipolar plunger pump and is used for saturating CO 2 The pressure vessel provides a driving solution to drive saturated CO 2 The fluid in the pressure container flows into an erosion reaction unit or a precipitation reaction unit of the simulation device; bipolar plunger pump injects drive solution in solution container into saturated CO 2 Bottom of pressure vessel, thereby driving saturated CO 2 The reaction solution in the pressure vessel enters an erosion reaction unit or a precipitation reaction unit.
Preferably, the draw solution in the solution container is deionized water.
Preferably, the corrosion reaction unit comprises a corrosion reaction kettle, and the corrosion reaction kettle comprises a corrosion reaction kettle body, a first feeding hole, a first discharging hole, a second discharging hole, a first filter, a second filter, a first sealing plug and a second sealing plug; the top of the corrosion reaction kettle body is provided with a first feeding hole, the bottom of the corrosion reaction kettle body is provided with a first discharging hole and a second discharging hole, the top end of the inside of the corrosion reaction kettle body is provided with a first filter, the bottom end of the inside of the corrosion reaction kettle body is provided with a second filter,a first sealing plug is arranged at the first feeding port; a second sealing plug is arranged at the first discharge hole and the second discharge hole; wherein the first feed inlet is connected with the saturated CO 2 The first discharge port is connected with the precipitation reaction unit, the second discharge port is connected with the first sampler, and the earth surface seepage zone carbonate rock B is arranged between the first filter and the second filter.
Preferably, the precipitation reaction unit comprises a precipitation reaction kettle, and the precipitation reaction kettle comprises a precipitation reaction kettle body, a second feeding hole, a gas outlet, a third discharging hole, a gas inlet, a third filter, a fourth filter, a third sealing plug and a fourth sealing plug; a second feeding hole and a gas outlet are formed in the top of the precipitation reaction kettle body, a third discharging hole and a gas inlet are formed in the bottom of the precipitation reaction kettle body, a third filter is arranged at the top end of the interior of the precipitation reaction kettle body, a fourth filter is arranged at the bottom end of the interior of the precipitation reaction kettle body, and third sealing plugs are arranged at the second feeding hole and the gas outlet and at the third discharging hole and the gas inlet; wherein the second feed inlet is connected with the corrosion reaction unit or the saturated CO 2 The pressure vessel, gas outlet and air intercommunication, the third discharge gate is connected the second sampler, gas inlet connects the air pump, and earth's surface seepage zone carbonate rock A and earth's surface undercurrent zone carbonate rock are arranged in between third filter and the fourth filter.
Preferably, the carbonate rock contemporaneous cementation simulation device further comprises a pipeline; wherein the bipolar plunger pump is connected to the saturated CO by a pipeline 2 Pressure vessel of said saturated CO 2 The pressure vessel is connected with the erosion reaction unit or the precipitation reaction unit through a pipeline, the erosion reaction unit is connected with the precipitation reaction unit through a pipeline, and the CO is 2 The gas cylinder is connected with the saturated CO through a pipeline 2 A pressure vessel.
Preferably, the material of the pipeline is rubber.
Preferably, the carbonate rock contemporaneous cementation simulation device further comprises a first sampler connecting pipe; the first sampler is connected with the corrosion reaction unit through a first sampler connecting pipe; one end of the first sampler connecting pipe passes through the second discharge hole and extends into the second filter in the corrosion reaction unit.
Preferably, the carbonate rock contemporaneous cementation simulation device further comprises an air pump connecting pipe; the air pump is connected with the precipitation reaction unit through an air pump connecting pipe; one end of the air pump connecting pipe passes through the gas inlet and extends into the carbonate A in the surface seepage zone in the precipitation reaction unit.
Preferably, the first sampler connecting pipe and the air pump connecting pipe are made of glass or plastic.
Preferably, the carbonate rock contemporaneous cementation simulation device further comprises a U-shaped pipe, and the second sampler is connected with the precipitation reaction unit through the U-shaped pipe; one end of the U-shaped pipe passes through the third discharge hole and extends into a fourth filter in the precipitation reaction unit.
Preferably, the material of the U-shaped pipe is glass or plastic.
Preferably, the carbonate rock contemporaneous cementation simulation device further comprises a valve, and the valve is arranged on the pipeline and the U-shaped pipe.
Preferably, the saturated CO 2 The pressure container and the valve are made of hastelloy.
Preferably, the material of the corrosion reaction kettle body and the material of the precipitation reaction kettle body are both transparent glass or transparent plastic.
The invention has the following beneficial effects:
the carbonate rock contemporaneous cementation simulation device provided by the invention can simulate the cementation process between carbonate rock and formation water under the environment close to a surface seepage zone and a subsurface zone, and is beneficial to researching the carbonate rock contemporaneous cementation generation control factor, the cement pattern and a pore preservation mechanism through experiments; by duplicating different pressures and fluid chemistries in the cementation process of vadose zone and undercurrent zone during the same growth period of carbonate rockThe conditions such as properties, sediment types and hydrodynamic conditions can be effectively simulated due to CO 2 Cementing that occurs as a result of changes in partial pressure, fluid chemistry, and flow rate; in addition, the seepage zone and the undercurrent zone environment are distinguished by a seepage zone corrosion reaction unit and a seepage zone and undercurrent zone precipitation reaction unit, and the saturated CO is pumped by a bipolar plunger pump 2 Pressure vessel realizing saturated solution CO 2 Partial pressure quantitative control and simulation of aqueous solution are closer to the quantitative analysis of geological actual and cementing effect control factors.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a carbonate rock contemporaneous cementation simulator provided by the present invention;
FIG. 2 shows a schematic diagram of an erosion reaction unit provided by the present invention;
FIG. 3 shows a schematic diagram of a precipitation reaction unit provided by the present invention;
wherein, 1-bipolar plunger pump, 2-saturated CO 2 A pressure vessel, a 3-corrosion reaction unit, a 4-precipitation reaction unit, a 5-first sampler, a 6-second sampler, a 7-air pump, 8-CO 2 The device comprises a gas cylinder, 9-a solution container, 31-an erosion reaction kettle body, 32-a first feeding hole, 33-a first discharging hole, 34-a second discharging hole, 35-a first filter, 36-a second filter, 37-a first sealing plug, 38-a second sealing plug, 39-a first sampler connecting pipe, 41-a precipitation reaction kettle body, 42-a second feeding hole, 43-a gas outlet, 44-a gas inlet, 45-a third discharging hole, 46-a third filter, 47-a fourth filter, 48-a third sealing plug, 49-a fourth sealing plug, 50-an air pump connecting pipe and 51-a U-shaped pipe.
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.
At present, the cementing effect of the carbonate deposit in the intergrowth period can only be realizedThe invention provides a carbonate rock contemporaneous cementation simulation device, which can realize the simulation of chemical precipitation processes close to the environment of a surface seepage zone and a subsurface flow zone respectively, namely realize the simulation of the carbonate rock in atmospheric fresh water, seawater and high-CO content respectively 2 The simulation of cementing and pore-filling under the action of fluid such as gas formation water solves the problems of the mechanism and the control factors (mainly comprising salinity and CO in pore water) of the cementing action of the carbonate rock in the same period 2 Partial pressure, ion type and content, pH value and the like), and defines the main control factors which do not generate cementation and are beneficial to pore preservation in the same growth period.
Specifically, with reference to fig. 1, the invention provides a carbonate rock in-situ cementation simulation device, which comprises a bipolar plunger pump 1 and saturated CO 2 A pressure vessel 2 and a precipitation reaction unit 4; the bipolar plunger pump 1 is connected with the saturated CO 2 Pressure vessel 2, said saturated CO 2 The pressure vessel 2 is connected with the precipitation reaction unit 4;
or the carbonate rock in-growth stage cementing effect simulation device comprises a bipolar plunger pump 1 and saturated CO 2 A pressure vessel 2, an erosion reaction unit 3 and a precipitation reaction unit 4; the bipolar plunger pump 1 is connected with the saturated CO 2 Pressure vessel 2, said saturated CO 2 The pressure vessel 2 is connected with the corrosion reaction unit 3, and the corrosion reaction unit 3 is connected with the precipitation reaction unit 4;
in the carbonate rock in-growth cementing simulation device, the bipolar plunger pump 1 is used for providing pressure required by the device, including providing saturated CO 2 The pressure of the reaction solution in the pressure vessel injected into the erosion reaction unit 3 or the precipitation reaction unit 4 and the pressure required for simulating the formation pressure are provided by compressing the reaction solution;
said saturated CO 2 The pressure vessel 2 is used to formulate and supply a corrosion reaction unit 3 or a precipitation reaction unit 4 with a composition comprising a certain amount of CO 2 A reaction solution of partial pressure gas comprising a certain amount of CO 2 Partial pressure gas of deionized water, seawater, formation water or artificially prepared solution, and further, the saturated CO 2 The pressure container 2 is made of hastelloy which is resistant to acid and alkali corrosion; it will be understood by those skilled in the art that the artificially prepared solution is a solution prepared according to an experimental protocol for a certain ion type, content and pH value.
The corrosion reaction unit 3 is used for placing the carbonate rock B in the surface seepage zone, and the carbonate rock B in the surface seepage zone reacts with the fluid injected into the corrosion reaction unit 3 to generate corrosion reaction generated liquid; the corrosion reaction unit 3 is used for simulating the corrosion reaction between the carbonate rock in the surface vadose zone and the formation water;
the precipitation reaction unit 4 is used for placing the carbonate rock A in the surface seepage zone and the carbonate rock in the surface subsurface seepage zone, and the carbonate rock A in the surface seepage zone and the carbonate rock in the surface subsurface seepage zone react with the fluid injected into the precipitation reaction unit 4 to generate precipitation reaction generation liquid; the precipitation reaction unit 4 is used for simulating precipitation reaction between the carbonate rock in the surface seepage zone and the carbonate rock in the surface subsurface zone and formation water.
In order to collect the corrosion reaction product liquid of the corrosion reaction unit, in a preferred embodiment of the present invention, the device for simulating cementing action during the growing period of carbonate rock further includes a first sampler 5, and the first sampler 5 is connected to the corrosion reaction unit 3 and is configured to obtain the corrosion reaction product liquid in the corrosion reaction unit.
In order to collect the precipitation reaction product liquid of the precipitation reaction unit, in a preferred embodiment of the present invention, the carbonate rock contemporaneous cementation simulating device further comprises a second sampler 6, wherein the second sampler 6 is connected with the precipitation reaction unit 4 and is used for acquiring the precipitation reaction product liquid in the precipitation reaction unit.
Further, in order to fill air into the carbonate rock a in the surface seepage zone in the precipitation reaction unit 4, in a preferred embodiment of the present invention, the carbonate rock contemporaneous cementation simulation apparatus further comprises an air pump 7, wherein the air pump 7 is connected with the precipitation reaction unit 4, so as to realize the communication between atmospheric water, surface water and groundwater and perform moisture exchange.
Furthermore, to saturate CO 2 Pressure vessel supplying CO 2 Gas, and better regulation of saturated CO 2 CO in reaction solution in pressure vessel 2 Partial pressure of gas, in a preferred embodiment of the invention, the apparatus further comprises CO 2 Gas cylinder 8, said CO 2 Gas cylinder 8 and said saturated CO 2 The pressure vessels 2 are connected.
Further, the carbonate rock in-growth stage cementation simulation device further comprises a solution container 9, wherein the solution container 9 is connected with the bipolar plunger pump 1 and used for saturated CO 2 The pressure vessel 2 provides a driving solution to drive the saturated CO 2 The fluid in the pressure container 2 flows into an erosion reaction unit 3 or a precipitation reaction unit 4 of the simulation device; the bipolar plunger pump 1 injects the drive solution in the solution container 9 into the saturated CO 2 Pressure vessel 2 bottom, thereby driving saturated CO 2 The reaction solution inside the pressure vessel 2 enters the erosion reaction unit 3 or the precipitation reaction unit 4.
Further, the draw solution in the solution container 9 is deionized water.
Further, as shown in fig. 2, in a preferred embodiment of the present invention, the corrosion reaction unit 3 includes a corrosion reaction kettle, and the corrosion reaction kettle includes a corrosion reaction kettle body 31, a first inlet 32, a first outlet 33, a second outlet 34, a first filter 35, a second filter 36, a first sealing plug 37 and a second sealing plug 38; a first feeding hole 32 is formed in the top of the corrosion reaction kettle body 31, a first discharging hole 33 and a second discharging hole 34 are formed in the bottom of the corrosion reaction kettle body 31, a first filter 35 is arranged at the top end of the inside of the corrosion reaction kettle body, a second filter 36 is arranged at the bottom end of the inside of the corrosion reaction kettle body, and a first sealing plug 37 is arranged at the first feeding hole 32; the first discharge port 33 and the second discharge portA second sealing plug 38 is arranged at the port 34; wherein the first feed port 32 is connected to the saturated CO 2 The pressure container 2 is provided with a first discharge hole 33 connected with the precipitation reaction unit 4, a second discharge hole 34 connected with the first sampler 5, and a surface seepage zone carbonate rock B arranged between a first filter 35 and a second filter 36; wherein the first and second filters 35, 36 are used to prevent carbonate particles from entering the pipeline causing pipeline plugging. In addition, in the structure shown in the figure, the corrosion reaction kettle specifically shown in the invention is a tubular reaction kettle, and it can be understood that the structure style of the corrosion reaction kettle can also be a jacket type or a combined type, and the invention is not limited; further, for better observing the experimental process, the material of the corrosion reaction kettle can be transparent glass or transparent plastic; further, in a preferred embodiment of the present invention, the corrosion reaction kettle body has an inner diameter of 25 cm and a length of 100 cm.
Further, as shown in fig. 3, in a preferred embodiment of the present invention, the precipitation reaction unit 4 comprises a precipitation reaction kettle, and the precipitation reaction kettle comprises a precipitation reaction kettle body 41, a second feed inlet 42, a gas outlet 43, a third discharge outlet 45, a gas inlet 44, a third filter 46, a fourth filter 47, a third sealing plug 48 and a fourth sealing plug 49; a second feeding hole 42 and a gas outlet 43 are formed in the top of the precipitation reaction kettle body 41, a third discharging hole 45 and a gas inlet 44 are formed in the bottom of the precipitation reaction kettle body 41, a third filter 46 is arranged at the top end of the interior of the precipitation reaction kettle body 41, a fourth filter 47 is arranged at the bottom end of the interior of the precipitation reaction kettle body 41, third sealing plugs 48 are arranged at the second feeding hole 42 and the gas outlet 43, and fourth sealing plugs 49 are arranged at the third discharging hole 45 and the gas inlet 44; wherein the second feed port 42 is connected with the corrosion reaction unit 3 or the saturated CO 2 The pressure container 2, the gas outlet 43 is communicated with the air, the third discharge hole 45 is connected with the second sampler 6, the gas inlet 44 is connected with the air pump 7, and the surface seepage zone carbonate rock A and the surface underflow zone carbonate rock are arranged in the third filter 46 and the fourth filterBetween the filters 47, the third filter 46 and the fourth filter 47 are used to prevent carbonate particles from entering the pipeline and causing the pipeline to be blocked; further, the carbonate rock a in the surface vadose zone is provided on the carbonate rock in the surface vadose zone, and the carbonate rock in the surface vadose zone is provided on the fourth filter 47. In addition, in the structure shown in the figure, the precipitation reaction kettle specifically shown in the invention is a tubular reaction kettle, and it can be understood that the structure style of the precipitation reaction kettle can also be a jacket type or a combined type, and the invention is not limited; further, for better observing the experimental process, the material of the precipitation reaction kettle can be transparent glass or transparent plastic; further, in a preferred embodiment of the present invention, the precipitation reactor body has an inner diameter of 25 cm and a length of 100 cm.
In addition, it can be understood by those skilled in the art that the simulation apparatus provided by the present invention can be connected with each other through a pipeline, for example, the bipolar plunger pump 1 is connected with the saturated CO through a pipeline 2 Pressure vessel 2, said saturated CO 2 The pressure vessel 2 is connected with an erosion reaction unit 3 or a precipitation reaction unit 4 through a pipeline, the erosion reaction unit 3 is connected with the precipitation reaction unit 4 through a pipeline, and the CO is 2 The gas cylinder 8 is connected with the saturated CO through a pipeline 2 Pressure vessel 2, etc.; wherein the material of the pipeline may be rubber. Further, as can be understood by those skilled in the art, the pipeline may be provided with necessary valves, and the valves may be two-way valves or three-way valves; the valve can be made of hastelloy which is resistant to acid and alkali corrosion.
In addition, in a preferred embodiment of the present invention, the carbonate intergrowth cementation simulation apparatus further comprises a first sampler connecting pipe 39; the first sampler 5 is connected with the erosion reaction unit 3 through a first sampler connection pipe 39; one end of the first sampler connecting pipe 39 extends through the second discharge port 34 into the second filter 36 in the erosion reaction unit 3.
Further, the carbonate rock contemporaneous cementation simulation device further comprises an air pump connecting pipe 50; the air pump 7 is connected with the precipitation reaction unit 4 through an air pump connecting pipe 50; one end of the air pump connection tube 50 extends through the gas inlet 44 into the subsurface vadose zone carbonate a within the precipitation reaction unit 4.
Further, the carbonate rock contemporaneous cementation simulation device further comprises a U-shaped pipe 51, and the second sampler 6 is connected with the precipitation reaction unit 4 through the U-shaped pipe 51; one end of the U-shaped pipe 51 extends into the fourth filter 47 in the precipitation reaction unit 4 through the third discharge hole 45; furthermore, the first sampler connecting pipe 39, the air pump connecting pipe 50 and the U-shaped pipe 51 are made of glass or plastic, and are resistant to acid and alkali corrosion; it will be understood by those skilled in the art that the first sampler connecting pipe, the air pump connecting pipe and the U-shaped pipe may be provided with necessary valves; the top of the U-shaped pipe is higher than the contact surface of the seepage zone and the subsurface zone sediment, so that the water solution is ensured to be fully contacted and reacted with the sediment in the subsurface zone after the seepage zone is reacted.
In summary, the carbonate rock contemporaneous cementation simulation device provided by the invention provides continuous driving saturated CO through the bipolar plunger pump 2 Injecting the reaction solution into the reaction unit in the pressure container and compressing the reaction solution to provide the pressure required by the simulated formation pressure; by saturation of CO 2 The pressure vessel is formulated to contain a quantity of CO 2 Partial pressure gas reaction solution; simulating the corrosion reaction between the carbonate sediment in the surface seepage zone and the simulated formation water through a corrosion reaction unit; simulating precipitation reaction between carbonate sediments in the surface seepage zone and the subsurface zone and simulated formation water through a precipitation reaction unit; thereby simulating the cementing action process between the carbonate sediment and the formation water under the environment close to the surface seepage zone and the subsurface seepage zone.
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 (6)
1. A carbonate rock in-situ cementation simulation device is characterized by comprising a bipolar plunger pump and saturated CO 2 The device comprises a pressure container, a precipitation reaction unit, an air pump connecting pipe, a U-shaped pipe and a second sampler;
the bipolar plunger pump is connected with the saturated CO 2 Pressure vessel of said saturated CO 2 The pressure container is connected with the precipitation reaction unit;
said saturated CO 2 The pressure container is used for preparing reaction solution;
the bipolar plunger pump is used for providing the pressure required by the device, including providing saturated CO 2 The pressure of the reaction solution injected into the reaction unit in the pressure vessel and the pressure required to simulate the formation pressure are provided by compressing the reaction solution;
the precipitation reaction unit is used for placing the carbonate rock A in the surface seepage zone and the carbonate rock in the surface undercurrent zone, and the carbonate rock A in the surface seepage zone is arranged on the carbonate rock in the surface undercurrent zone;
the precipitation reaction unit comprises a precipitation reaction kettle, and the precipitation reaction kettle comprises a precipitation reaction kettle body, a second feeding hole, a gas outlet, a third discharging hole, a gas inlet, a third filter, a fourth filter, a third sealing plug and a fourth sealing plug; a second feeding hole and a gas outlet are formed in the top of the precipitation reaction kettle body, a third discharging hole and a gas inlet are formed in the bottom of the precipitation reaction kettle body, a third filter is arranged at the top end of the interior of the precipitation reaction kettle body, a fourth filter is arranged at the bottom end of the interior of the precipitation reaction kettle body, and third sealing plugs are arranged at the second feeding hole and the gas outlet and at the third discharging hole and the gas inlet; the carbonate rock A in the surface seepage zone and the carbonate rock in the surface undercurrent zone are arranged between the third filter and the fourth filter; the gas outlet is communicated with air;
the air pump is connected with the precipitation reaction unit through an air pump connecting pipe, and one end of the air pump connecting pipe penetrates through the gas inlet and extends into the carbonate rock A of the subsurface vadose zone in the precipitation reaction unit; the second sampler is connected with the precipitation reaction unit through a U-shaped pipe; one end of the U-shaped pipe passes through the third discharge hole and extends into the fourth filter in the precipitation reaction unit, and the top of the U-shaped pipe is higher than the contact surface of the carbonate A in the surface seepage zone and the carbonate A in the surface underflow zone.
2. The carbonate rock intergrowth cementation simulation device of claim 1, further comprising CO 2 Gas cylinder of said CO 2 Gas cylinder and said saturated CO 2 Connecting the pressure containers; the carbonate rock in-growth stage cementing action simulation device further comprises a solution container, and the solution container is connected with the bipolar plunger pump.
3. The carbonate rock intergrowth cementation simulation device of claim 1, further comprising an erosion reaction unit; the corrosion reaction unit is arranged on the saturated CO 2 Between the pressure vessel and the precipitation reaction unit; the corrosion reaction unit is used for placing the carbonate rock B in the surface seepage zone.
4. The carbonate rock intergrown phase cementation simulation apparatus of claim 3, further comprising a first sampler connected to the erosion reaction unit.
5. The carbonate rock in-growth stage cementation effect simulation device of claim 3 or 4, wherein the corrosion reaction unit comprises a corrosion reaction kettle, and the corrosion reaction kettle comprises a corrosion reaction kettle body, a first feeding hole, a first discharging hole, a second discharging hole, a first filter, a second filter, a first sealing plug and a second sealing plug; the corrosionThe top of the reaction kettle body is provided with a first feeding hole, the bottom of the corrosion reaction kettle body is provided with a first discharging hole and a second discharging hole, the top end of the inside of the corrosion reaction kettle body is provided with a first filter, the bottom end of the inside of the corrosion reaction kettle body is provided with a second filter, and the first feeding hole is provided with a first sealing plug; a second sealing plug is arranged at the first discharge hole and the second discharge hole; wherein the first feed inlet is connected with the saturated CO 2 And the first discharge hole is connected with the precipitation reaction unit, and the surface seepage zone carbonate rock B is arranged between the first filter and the second filter.
6. The carbonate rock intergrown phase cementation simulation apparatus of claim 5, further comprising a first sampler connecting tube; the first sampler is connected with the second discharge hole through a first sampler connecting pipe; one end of the first sampler connecting pipe passes through the second discharge hole and extends into the second filter in the corrosion reaction unit.
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| CN114486712B (en) * | 2021-12-31 | 2023-12-15 | 武汉理工大学 | Device and method for simulating dynamic corrosion of metal in deep geological treatment environment |
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