CN215525800U - Experimental device for evaluating self-healing capability of cement stone - Google Patents
Experimental device for evaluating self-healing capability of cement stone Download PDFInfo
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- CN215525800U CN215525800U CN202121363209.6U CN202121363209U CN215525800U CN 215525800 U CN215525800 U CN 215525800U CN 202121363209 U CN202121363209 U CN 202121363209U CN 215525800 U CN215525800 U CN 215525800U
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Abstract
An experimental device for evaluating the self-healing capability of cement stones comprises a methane gas cylinder, a gas flowmeter, a first pressure sensor, a rock core holder, a back pressure valve and a second pressure sensor which are sequentially connected; a crack type self-healing core model is placed in the core holder; the rock core holder and the back pressure valve are connected with the confining pressure pump; the rock core holder is arranged in a constant temperature box; the gas flowmeter, the first pressure sensor and the second pressure sensor are electrically connected with the data acquisition system. The utility model has reasonable design, can simulate the size of a crack generated by well cementation set cement under different conditions and evaluate the healing capacity of the self-healing set cement, can carry out experiments under high-temperature and high-pressure environments, and is close to the actual production process of a gas reservoir.
Description
Technical Field
The utility model belongs to the technical field of physical simulation, and particularly relates to an experimental device for evaluating the self-healing capacity of cement stones.
Background
After a natural gas well is fixed, stratum creep, perforation or temperature influence can generate stress change to cause cement stone damage and micro-cracks, and finally, problems of interlayer channeling or wellhead gas channeling and the like are caused to cause the shutdown of the gas well. The well cementation method commonly used for solving the problems comprises the steps of adopting high-mechanical-property elastic expansion cement slurry and a self-healing cement slurry system with self-healing property, wherein the elastic expansion cement slurry system is mainly used for dealing with perforation and fracturing during well completion operation and can effectively deal with cement stone damage caused by stretching and compression, but once the cement stone is damaged, the self-healing effect cannot be achieved; the self-healing cement slurry system can solve the problem of oil-gas cross flow caused by the damage of a cement sheath through a self-diagnosis and repair technology. Through years of development, great progress is made in self-healing cement slurry formula at home and abroad, but the corresponding evaluation of the self-healing capability of the set cement still has many defects.
Through literature research, the evaluation indexes of the self-healing capability of the cement paste at present comprise the pressure change of the artificially manufactured micro-annular space or micro-crack test gas injected through the micro-annular space or the conductivity change rate of an electrolyte solution in a through hole and the like. The artificially manufactured micro-annulus test gas can only simulate the healing capacity after the micro-annulus is generated between a shaft and a set cement through the injection pressure change of the micro-annulus, and cannot simulate and evaluate the healing capacity after the micro-crack is generated on the set cement, and the artificial micro-crack is formed by adding a gasket into the crack after splitting, so that the crack width cannot be accurately obtained; although the conductivity change rate test of the through hole electrolyte solution is based on the measurement of the conductivity change in the set process of the set cement when the self-healing material is added or not, after the cement ring in the actual shaft is damaged due to the influence of factors such as stress or temperature and the like after being set, a chemical reaction is generated and the microcracks are healed after the cement ring is soaked in oil or gas, so that the conductivity test method has deviation from the actual production process and is more similar to the nondestructive set cement expansion rate test.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides an experimental device for evaluating the self-healing capability of cement stones.
The utility model realizes the purpose through the following technical scheme:
the utility model provides an experimental apparatus for be used for evaluating cement stone self-healing ability which characterized in that: the device comprises a methane gas cylinder, a gas flowmeter, a first pressure sensor, a rock core holder, a back pressure valve and a second pressure sensor which are connected in sequence; a crack type self-healing core model is placed in the core holder; the rock core holder and the back pressure valve are connected with the confining pressure pump; the rock core holder is arranged in a constant temperature box; the gas flowmeter, the first pressure sensor and the second pressure sensor are electrically connected with the data acquisition system.
Furthermore, temperature degradation plastics are arranged in the crack width of the crack type self-healing core model.
Furthermore, the crack width range of the crack type self-healing core model is 10-1000 microns, and the crack completely penetrates through the core pillar and has the width of about 1 cm.
The beneficial technical effects of the utility model are as follows:
1. the device has the advantages of simple structure, reasonable design, convenient installation and layout, convenient use and operation, low investment cost, reliable working performance, good simulation effect and wide application range, changes the temperature degradation plastic into different thicknesses, and can simulate the cracks with different sizes and the healing performance of the self-healing cement stone.
2. The experimental device for evaluating the self-healing capability of the cement stone has high practical value and relatively wide popularization and application prospects, can be used for evaluating the healing performance of the self-healing cement stone under different injection parameters and crack widths, and provides a foundation for theoretical research on the healing performance of the self-healing material.
3. The method is further development of evaluation and research on the healing performance of the self-healing material, and provides a solid theoretical basis and an indoor experimental means for reasonable application of the self-healing cement slurry well cementation technology.
4. The test device has the advantages of good use effect, good intuition, accurate test data in experiments, and capability of accurately simulating cracks with different seam widths by placing the degradable plastics with different thicknesses and temperatures. And is suitable for evaluating the healing capacity of the self-healing material by the change of the methane gas injection parameters.
5. The experimental crack type self-healing cement rock core model has the advantages that the working performance is stable, the application range is wide, the size of the experimental crack type self-healing cement rock core model is 25.00mm in diameter and 300.00mm in length, the crack width range is 10-1000 microns, cracks completely penetrate through a rock core column and are about 1cm in width, and the experimental simulation displacement medium can be various displacement media such as crude oil, nitrogen, methane, dry gas and the like.
In conclusion, the crack type self-healing cemented rock core model is utilized, the evaluation of the self-healing capacity of the microcracks with different crack widths is realized, the injection pressure and the outlet pressure during gas constant-flow displacement are recorded, and the current crack healing capacity of the cemented rock can be obtained according to a gas logging permeability formula and a self-healing capacity formula. The utility model has wide application range and higher research and application values, and lays a good theoretical foundation for the development and application of the self-healing well cementation technology.
Drawings
FIG. 1 is a schematic diagram of the connection of the experimental apparatus of the present invention.
Fig. 2 is a schematic diagram of a process for manufacturing a fracture-type self-healing cemented rock core model, wherein (1) is a self-healing core column with temperature-degradable plastics, and (2) is a fracture-type self-healing core model after degradation of temperature-degradable materials.
In the figure: 1.1-a first pressure sensor, 1.2-a second pressure sensor, 2-a switch valve, 3-a methane gas cylinder, 4-a gas flowmeter, 5-a data acquisition system, 6-a confining pressure pump, 7-a back pressure valve, 8-a core holder, 9-a crack type self-healing core model, 10-a thermostat, 101-temperature degradation plastic and 102-cracks.
Detailed Description
The utility model is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1, an experimental apparatus for evaluating a self-healing capability of a set of cement comprises a methane gas cylinder 3, a gas flow meter 4, a first pressure sensor 1.1, a core holder 8, a back pressure valve 7 and a second pressure sensor 1.2 which are connected in sequence, wherein a crack self-healing core model 9 is placed in the core holder 8; the rock core holder 8 and the back pressure valve 7 are connected with the confining pressure pump 6; the rock core holder 8 is arranged in a constant temperature box 10; the gas flowmeter 4, the first pressure sensor 1.1 and the second pressure sensor 1.2 are electrically connected with the data acquisition system 5.
Methane in the methane gas cylinder 3 is constantly injected into the rock core through the switch valve 2 and the gas flowmeter 4, confining pressure and back pressure of the rock core are applied through the confining pressure pump 6, injection pressure and outlet pressure are respectively monitored through the first pressure sensor 1.1 and the second pressure sensor 1.2 of pressure and are transmitted to the data acquisition system 5, and gas reservoir temperature is regulated and controlled through the constant temperature box 10.
The back pressure valve 7 is used for controlling methane gas to inject the pressure of the rock core and the pressure inside the rock core, and the back pressure pump 6 is used for simulating the confining pressure of a gas reservoir and controlling the opening pressure of the back pressure valve 7. The back pressure of the fracture model is set as the bottom hole pressure, and the confining pressure must be kept constant in the experimental process so as to prevent the confining pressure change from influencing the fracture width. The confining pressure is controlled to be slightly higher than about 0.5MPa, so that the influence of the confining pressure on the width of the crack is prevented.
The crack width of the crack type self-healing core model 9 is controlled by the temperature degradable plastics 101, the temperature degradable plastics 101 with different thicknesses can be placed according to experimental requirements, and after the self-healing cement slurry is solidified, the degraded plastics are blown away by heating and introducing gas to form a crack 102. And recording the injection pressure and the outlet pressure during gas constant-flow displacement in the experimental process, and finally obtaining the healing capacity of the set cement on the current-width crack according to a gas logging permeability formula and a self-healing capacity formula.
Preferentially, the methane gas cylinder 3 is high-purity methane gas, the pressure is 10Mpa, the displacement mode is a constant-flow mode, the constant methane gas injection flow is set through a gas flowmeter, the crack type rock core gas logging permeability K is calculated according to the inlet and outlet pressure difference value and a gas logging permeability formula, and the calculation formula is as follows:
in the formula, K-gas permeability, 10-3μm2(ii) a A-gas cross-sectional area, cm2(ii) a L-gas cross length, cm; q0-gas flow at atmospheric pressure, mL/s; μ -gas flow, mpa.s; p1，P2Model inlet and outlet pressures, MPa, P0Atmospheric pressure, 0.1 MPa.
Preferably, the formula for calculating the self-healing capability η of the set cement is as follows:
in the formula, eta-cement healing ability,%; k1Gas permeability of the pre-healing cement stone mould, 10-3μm2；K2Gas permeability of cemented carbide mould after healing, 10-3μm2。
In this embodiment, the size of the fracture-type self-healing cemented rock core model is 25.00mm in diameter and 300.00mm in length, the range of fracture width is 10-1000 μm, and the fracture completely penetrates through the core pillar and has a width of 1 cm.
When the fracture width is determined, parameters such as methane gas injection pressure, experiment temperature and injection duration are changed, and the influence of gas injection pressure, temperature and time on the self-healing core healing capacity is inspected.
When the gas injection pressure, temperature and injection duration are determined, the fracture width is changed, and the healing capacity of the self-healing material to different fracture widths is considered.
The experimental method of the device of the utility model is as follows:
step one, evaluating an experiment of the self-healing capability of a crack type self-healing cement model when the crack width is 10 mu m, wherein the experiment process is as follows:
1001. detection by an experimental device: and the test device is connected to check the tightness of the pipeline and the valve, whether the data acquisition system operates normally, whether the rock core holder leaks water, and whether the crack type rock core model is intact.
1002. The manufacturing process of the crack type self-healing core model comprises the following steps: placing 10-micron-thick temperature-degradable plastic in the middle of a cement stone curing mould, ensuring that the degradable plastic completely penetrates through the cement stone mould and is centered left and right, pouring a prepared self-healing cement paste system into the mould, curing cement paste under the condition of being lower than the degradation temperature of the temperature-degradable plastic and ensuring that the cement paste is completely solidified, placing the solidified cement stone at a temperature higher than the degradation temperature of the plastic, completely degrading the temperature-degradable plastic, blowing away the degraded material by using gas, and forming an artificial crack with the middle part being about 1cm wide and the thickness being about 10 microns.
1003. Self-healing capability evaluation experiment when crack width of crack type self-healing cement stone model is 10 mu m: heating a rock core holder 8 provided with a crack type self-healing cement stone model 9 to a gas reservoir temperature through a constant temperature box 10, pressurizing the rock core holder by about 0.5MPa by using a confining pressure pump 6, pressurizing a back pressure valve 7 to the gas reservoir pressure by using the confining pressure pump 6, opening a methane gas cylinder 3 and a control valve 2, opening a gas flowmeter 4 and setting a constant injection gas flow of 400ml/min, recording inlet and outlet pressures through a first pressure sensor 1.1 and a second pressure sensor 1.2, and recording system pressure and gas flow through a data acquisition system 5, wherein after the experiment is carried out for one week, the healing capacity of the cement stone to the current width crack within a certain time can be obtained according to a gas logging permeability formula and a self-healing capacity formula.
Step two, evaluating experiments of the healing capacity of the self-healing cement stones with different crack widths, wherein the experiment process is as follows:
2001. detection by an experimental device: the integrity of the device is checked as per step 1001.
2002. The manufacturing process of the self-healing core model with different seam widths comprises the following steps: respectively placing 10 mu m, 20 mu m and 30 mu m thick temperature degradable plastics in the middle of different cement stone curing moulds to ensure that the degradable plastics completely penetrate through the cement stone moulds and are centered left and right, pouring the prepared self-healing cement slurry system into the moulds, curing the cement slurry and ensuring that the cement slurry is completely solidified under the condition of being lower than the degradation temperature of the temperature degradable plastics, placing the solidified cement stones at a temperature higher than the degradation temperature of the plastics to ensure that the temperature degradable plastics are completely degraded and the degraded materials are blown away by gas to form three artificial crack type self-healing cement stone core models with the middle part being about 1cm wide and the thicknesses being about 10 mu m, 20 mu m and 30 mu m.
2003. Evaluation experiment of healing capability of self-healing cement stones with different crack widths: and respectively replacing the 10-micron fracture type core in the step 1003 with a core of 20-micron and a core of 30-micron, and evaluating the healing capacity of the set cement within a certain time by adopting the same steps.
Step three, data processing:
according to the experimental data recorded in the steps 1003 and 2003, the healing capacity of the self-healing material to fracture type cores with different widths can be calculated, wherein the healing capacities of the cores with three fracture widths of 10 micrometers, 20 micrometers and 30 micrometers are 95.55%, 91.42% and 90.99% respectively (table 1), and the self-healing capacity of the set cement is gradually reduced along with the increase of the fracture width.
Table 1 self-healing set cement experiment evaluation data
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (3)
1. The utility model provides an experimental apparatus for be used for evaluating cement stone self-healing ability which characterized in that: the device comprises a methane gas cylinder (3), a gas flowmeter (4), a first pressure sensor (1.1), a rock core holder (8), a back pressure valve (7) and a second pressure sensor (1.2) which are connected in sequence; a crack type self-healing core model (9) is arranged in the core holder (8); the rock core holder (8) and the back pressure valve (7) are connected with the confining pressure pump (6); the rock core holder (8) is arranged in a constant temperature box (10); the gas flowmeter (4), the first pressure sensor (1.1) and the second pressure sensor (1.2) are electrically connected with the data acquisition system (5).
2. The experimental device for evaluating the self-healing capability of the set cement according to claim 1, wherein: and temperature degradation plastic (101) is arranged in the crack width of the crack type self-healing core model (9).
3. The experimental device for evaluating the self-healing capability of the set cement according to claim 2, wherein: the crack width range of the crack type self-healing core model (9) is 10-1000 mu m, and the crack completely penetrates through the core pillar and has the width of about 1 cm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115684279A (en) * | 2022-10-31 | 2023-02-03 | 江苏科技大学 | Quantitative test device and method for crack self-repairing effect of cement-based material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115684279A (en) * | 2022-10-31 | 2023-02-03 | 江苏科技大学 | Quantitative test device and method for crack self-repairing effect of cement-based material |
| CN115684279B (en) * | 2022-10-31 | 2023-11-21 | 江苏科技大学 | Cement-based material crack self-repairing effect quantitative test device and method |
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