CN102401770B - High-temperature high-pressure tensile stress strain system of oil well cement and test method thereof - Google Patents
High-temperature high-pressure tensile stress strain system of oil well cement and test method thereof Download PDFInfo
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- CN102401770B CN102401770B CN201010277842.3A CN201010277842A CN102401770B CN 102401770 B CN102401770 B CN 102401770B CN 201010277842 A CN201010277842 A CN 201010277842A CN 102401770 B CN102401770 B CN 102401770B
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Abstract
The invention relates to a high-temperature high-pressure tensile stress strain system of oil well cement. The system comprises a cement tensile test assembly, a power supply and pressure control unit, a temperature control unit, a signal control processing unit and pipelines. By adopting the system of the invention, the temperature and the pressure for the bottom maintenance can be simulated, the tensile stress strain of the oil well cement can be continuously measured under conditions of the temperature and the pressure, and the temperature pressure curve and the tensile stress strain curve are recorded. The system and the measure method of the invention are in favor of the intuitional test, the comparison of tensile resistances of different cement paste systems and the design of the cement paste formula, so cement paste systems which can satisfy on-site construction requirements are obtained.
Description
Technical field
The invention belongs to reinforcing oil well Behavior of Hardened Cement Paste field tests, relate to a kind of oil well cement high temperature high pressure Compression and Expansion ess-strain system, tensile strength, the tensile stress-strain of static condition maintenance under energy simulation well, mensuration Behavior of Hardened Cement Paste different time.
Background technology
In prior art, for hardened oilwell cement ess-strain stretching experiment, the indoor test method of tensile strength is less, use for reference to a great extent Concrete Industry testing standard, surveying instrument function singleness, also do not have a kind of integrated equipment can under the temperature, pressure of curing water mudstone, measure the technical parameters such as the stretching of Behavior of Hardened Cement Paste, though existing measuring equipment folding/tension test instrument as anti-in cement can be measured the pulling strengrth of Behavior of Hardened Cement Paste, but the condition using is normal temperature and pressure, the measurement directly perceived under high-temperature and high-pressure conditions cannot be realized and the real time record of experimental data can not be realized, Behavior of Hardened Cement Paste stretch-proof experiment under cannot analogue measurement shaft bottom high-temperature and high-pressure conditions, certainly also can not realize the real time record of experimental data.For the above-mentioned state of the art, applicant has carried out the research of this patent.
Applicant, by patent retrieval and literature query, finds no the technical equipment similar with the present invention.
Being described as follows of existing experimental apparatus and method:
Concrete Industry build-in test tensile strength, ess-strain stretching experiment at present: it is 2.54cm that the cement slurry preparing is injected to diameter, height is in the die trial of 2.54cm, be placed under assigned temperature maintenance to regulation length of time, tested for tensile strength, ess-strain stretching experiment (every group of 5 samples, average) on universal testing machine.But be not suitable for the test under high-temperature and high-pressure conditions, can not realize the High Temperature High Pressure maintenance to Behavior of Hardened Cement Paste.
" comparative study of low-density cement mortar mechanical property ": in the document, tensile-strength test piece and stress～strain-gauge test are by Behavior of Hardened Cement Paste maintenance certain length of time under water bath condition under set point of temperature, then tested for tensile strength on hydraulic universal material testing machine is drawn out stress-strain curve in rectangular coordinate system.But can not directly obtain stress-strain diagram, can not realize the maintenance with pressure to Behavior of Hardened Cement Paste, can not realize the test of test water mudstone tensile strength under High Temperature High Pressure.
" Multifunctional portable material tester " (ZL patent No. 93211524.1): this invention can complete the experiments such as Compression and Expansion, shearing, torsion, but be not suitable for the test under high-temperature and high-pressure conditions, can not realize the High Temperature High Pressure maintenance to Behavior of Hardened Cement Paste.
Therefore, prior art weak point is embodied in: at present less for the indoor test method of Behavior of Hardened Cement Paste stretch-proof ess-strain, surveying instrument function singleness, also do not have a kind of integrated equipment can in curing water mudstone, measure the tensile strength of Behavior of Hardened Cement Paste, the technical parameters such as tensile stress-strain, existing measuring equipment is as EL39-7100/01, anti-folding/the tension test of EP-05060 cement instrument, QJ210A tensile modulus of elasticity test instrument all, 1 cannot realize and carries out tensile strength test simultaneously, 2 and can not be used for the measurement under high-temperature and high-pressure conditions, 3 can not realize the real time record of experimental data, can not reflect the relation of stress and strain.For the above-mentioned state of the art, applicant has carried out the research of this patent.
Summary of the invention
The present invention is directed to the technical matters existing in prior art, research and develop the present invention, oil well cement high temperature high pressure tensile stress-strain system and method for testing thereof, the invention provides a kind of oil well cement high temperature high pressure tensile stress-strain instrument, make grout carry out maintenance under simulation downhole condition, this instrument can be simulated in well under high-temperature and high-pressure conditions the directly tensile stress-strain curve of test water mudstone, with test water mudstone pulling strengrth, judges the fragility of comparison Behavior of Hardened Cement Paste with this; Institute's test result is actual conditions under simulation well better.
The present invention is in order to realize above-mentioned goal of the invention, and the technical scheme of taking is as follows,
Oil well cement high temperature high pressure tensile stress-strain system, described system comprises cement extension test assembly, power supply and pressure control unit, temperature conditioning unit, signal controlling processing unit and pipeline;
Cement to be measured is injected to described cement extension test assembly, and described pressure control unit and temperature conditioning unit are according to the pressure and temperature of cement extension test assembly described in the control signal control of described signal controlling processing unit output; Test signal is exported to signal controlling processing unit by described cement extension test assembly, obtains the drawing stress result of cement to be measured.Described pipeline 2 is the fastening means of air compressor 1 and pressure control unit 3, water source 7 and pressure control unit 3, oil well cement high temperature high pressure tensile stress-strain instrument 44 and pressure control unit 3; Described pressure source is air compressor.
In described system, also comprise displacement transducer, described displacement transducer is arranged in described cement extension test assembly, the small distortion of depressing outside for test water mudstone, and deformation data are exported to described signal controlling processing unit.
Described cement extension test assembly comprises autoclave body and drawing die; Described drawing die is arranged in described autoclave body;
Described autoclave body comprises displacement transducer, maintenance compression fittings, pressure head pressurizing adaptor, kettle upper cover, piston, cushion rubber group, drawing die, kettle lower cover;
Described displacement transducer is arranged in oil well cement high temperature high pressure tensile stress-strain instrument 44; Displacement transducer 16 is connected on piston 30, and piston 30 pushes into suitable for reading 40 of stretching kettle upper cover 29; Cushion rubber 31 is enclosed within the short slot of stretching kettle upper cover 29; Maintenance pressure hose 14 is linked on maintenance compression fittings 27; Maintenance compression fittings 27 is screwed into right mouthful 42 of stretching kettle upper cover 29; Pressure head pressurization sebific duct 15 is linked on pressure head pressurizing adaptor 28; Pressure head pressurizing adaptor 28 is screwed into left mouthful 41 of stretching kettle upper cover 29; Cushion rubber 34 is enclosed within the short slot of stretching kettle lower cover 35; Stretching kettle lower cover 35 is screwed to the bottom of stretching kettle 33; Stretching kettle 33 is put in drawing die combination 32; Stretching kettle upper cover 29 is screwed to the top of stretching kettle 33; Stretching kettle 33 is fallen into heating kettle cover 18.
Described drawing die comprises stretching pressure-bearing post, drawing die upper cover and drawing die cylindrical shell; The taper end of stretching pressure-bearing post 36 is inserted in the hole of drawing die cylindrical shell 38, to injected water mud in drawing die cylindrical shell 38 to drawing die cylindrical shell 38 coboundary 2-3mm places, drawing die upper cover 37 is dropped on cement surface.
Described pressure control unit comprises pressure source, power switch, tensimeter group and valve sets; Described tensimeter group comprises input pressure pressure table 9, for the pressure size that shows that air compressor 1 is inputted to precision pressure source 3; Output pressure is pressed table 8, for showing the pressure size of precision pressure source 3 to 44 inputs of oil well cement high temperature high pressure compressed stress-strain gage; Described valve sets comprises water source valve 10, is input to the water yield of pressure control unit 3 for controlling water source 7; High voltage output valve 11, is input to the air capacity of pressure control unit 3 for controlling air compressor 1; Compression rate variable valve 12, is input to the speed of oil well cement high temperature high pressure compressed stress-strain gage 44 pressure for controlling precision pressure source 3; Pressure-regulating valve 39 is input to the pressure size of oil well cement high temperature high pressure tensile stress-strain instrument 44 for controlled pressure control module 3; Power switch 13.
Respectively and water source, power supply connects in described pressure control unit one end, and exports by described valve sets controlled pressure and water source; The other end is transferred to the signal of output the port of described cement extension test assembly by described signal controlling processing unit.
Compression rate can range of adjustment at 0-15MPa/S.
Described temperature conditioning unit comprises thermopair, heating kettle cover, temperature controller;
Described electroheat pair 17 is arranged in oil well cement high temperature high pressure tensile stress-strain instrument 44; Heating kettle overlaps 18 upper surfaces a heating kettle trepanning 43; Electroheat pair 17 inserts in heating kettle trepanning 43.Electroheat pair 17 fundamental purposes are to measure the temperature of heating kettle cover 18 and stretching kettle 33, and this temperature shows in temperature controller 19.
Described heating kettle cover 18 is arranged in operator's console 45, and its effect is for placing stretching kettle 33.
The top of described oil well cement high temperature high pressure tensile stress-strain instrument 44 is general control panels 5, and bottom is operator's console 45.
Described temperature controller is arranged in described signal controlling processing unit in physical parameter control module, for controlling output temperature.
Described signal controlling processing unit comprises every physical parameter control module and signal analysis control processing module;
Described physical parameter control module comprises temperature controller 19, for showing the temperature of heating kettle cover 18 and stretching kettle 33; Tensimeter 20, for showing the pressure in stretching kettle 33; Maintenance pressure valve 21, for controlling the pressure size of curing water mud; Pressure head pressurizing valve 22, is added in the test pressure on Behavior of Hardened Cement Paste for restrained stretching while experiment, power switch 23 starts heater switch 24, temperature reset switch 25 and stop heater switch 26;
Described physical parameter control module according to the steering order of the pressure signal of pressure control unit input and the input of signal analysis control processing module by the high pressure of output, maintenance, temperature control signals is exported to described cement extension test assembly, controls its operation;
The result of detection is exported to described signal analysis control processing module by described cement extension test assembly, and show output.
The method that application rights of the present invention requires the tensile stress-strain system described in 1～7 to test oil well cement, comprises the steps:
Step 1: preliminary work
Connect source of the gas, power supply, the water source of pressure control unit; Each valve of pressure control unit and switch, all in off-position, connect the power supply of instrument, connect the power supply of computing machine, and with instrument communication line, open computing machine and enter control program unit;
Step 2: sample preparation
Application drawing die, after being coated with to vaseline, inserts in drawing die cylinder 38 on stretching pressure-bearing post 36, so far can be to injected water mud in mould, grout face is from the drawing die cylinder about 2-3mm of 38 coboundary position, again drawing die upper cover 37 is dropped on cement surface, complete the assembling of drawing die and the injection process of grout; And open kettle upper cover 29 drawing die 32 is put into still 33;
The maintenance pressure hose of system 14 and pressure head pressurization sebific duct 15 are received respectively on the maintenance compression fittings 27, pressure head pressurizing adaptor 28 of kettle upper cover, the displacement transducer 16 of screwing on, plugs thermopair 17;
Step 3: the maintenance of heating, pressurize
Open system power supply switch, open the water source valve of pressure control unit, High voltage output valve, opens the maintenance pressure valve on instrument panel, opens heater switch, is plugged thermopair; When temperature control enters constant temperature zone, carry out ftercompction; Close water source valve, open compression rate variable valve, the more stubborn pressure-regulating valve of clockwise direction, because entering pressurized cylinder, gas needs equilibration time, and pressure-regulating valve regulates and should slowly carry out, and before high pressure reaches predetermined pressure soon, stops regulating, and observes pressure; After 5 minutes, slowly regulate once again, reach predetermined pressure; Grout is pressed the maintenance of preset temperature pressure;
Step 4: the test operation of tension stress strain
Signal analysis control processing module is carried out step control, closes instrument maintenance pressure valve, opens pressure head pressurizing valve; The compression rate variable valve of closing presure control module, with pressure-regulating valve regulate bleed pressure to 0.4Mpa; Open compression rate variable valve, pressurization starts, and computer screen shows test curve.
Input pressure value range 0-69.1MPa in this method, Range of measuring temp is at 25-175 ℃.
The technique effect feature that the present invention adopts above-mentioned technical scheme to reach is as follows:
(1) multifunctionality
Utilize the present invention: can artificial ground (temperature and pressure), realize the evaluation of the tensile stress-strain curve to the different curing age of Behavior of Hardened Cement Paste;
(2) intuitive
Utilize the present invention: the tensile stress-strain curve of Behavior of Hardened Cement Paste can be by the particular design displacement transducer record the demonstration in real time on computer screen that are connected with computing machine;
(3) precision pressure source
Accurate pressure source can provide stable Output pressure; Compression rate can regulate (0-15MPa/S); In the time that experimental system exceedes setting range due to reason build-ups of pressure such as temperature, system can reduce pressure automatically, realizes pressure protect effect.
(4) precise displacement sensor
Behavior of Hardened Cement Paste has small distortion at pressure, and displacement transducer just can test out, and sends into computing machine processing.
(5) system adopts computer program control computer data processing system
Temperature, pressure, displacement signal are obtained by computing machine and controller communication, and computing machine through data processing, shows these signals on computer screen, and computer runs programs shows each curve, automatically generates laboratory report.
Utilize the present invention can simulation well at the bottom of the temperature, pressure of maintenance, and under this temperature, pressure the Compression and Expansion stress of continuous coverage hardened oilwell cement, and record temperature, pressure curve, tensile stress strain curve.Experiment top pressure 69.1MPa, 175 ℃ of maximum temperatures, are conducive to visual test and contrast the tensile property of different mortar architectures, are conducive to carry out the design of grout formula, are met the mortar architecture of site operation demand.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of system of the present invention;
Fig. 2 is the panel schematic diagram of physical parameter control module in signal controlling processing unit;
Fig. 3 is autoclave body structural representation;
Fig. 4 is the structural representation of autoclave body upper cover;
Fig. 5 is drawing die schematic diagram;
Figure 6 shows that the experimental result picture of embodiment 1 mortar architecture tensile stress-strain;
Figure 7 shows that the experimental result picture of embodiment 2 mortar architecture tensile stress-strains;
Be illustrated below in conjunction with embodiment.
Embodiment
Fig. 1 is oil well cement high temperature high pressure tensile stress-strain system diagram, wherein: air compressor 1, pipe system 2, pressure control unit 3, power supply 4, physical parameter control module panel 5, signal analysis control processing module 6, water source 7, output pressure is pressed table 8, input pressure is pressed table 9, water source valve 10, High voltage output valve 11, compression rate variable valve 12, power switch 13, maintenance pressure hose 14, pressure head pressurization sebific duct 15, displacement transducer 16, electroheat pair 17, heating kettle cover 18, pressure-regulating valve 39, heating kettle trepanning 43, oil well cement high temperature high pressure tensile stress-strain instrument 44, operator's console 45.
The top of oil well cement high temperature high pressure tensile stress-strain instrument 44 is divided into physical parameter control module panel 5, and bottom is operator's console 45; Heating kettle cover 18 is arranged in operator's console 45, heating kettle trepanning 43 in heating kettle cover 18.
Output pressure is pressed table 8, and input pressure is pressed table 9, water source valve 10, High voltage output valve 11, and compression rate variable valve 12, power switch 13, pressure-regulating valve 39 are arranged in pressure control unit 3.
Fig. 2 is the panel schematic diagram of physical parameter control module in signal controlling processing unit; Wherein, temperature controller 19, tensimeter 20, maintenance pressure valve 21, pressure head pressurizing valve 22, power switch 23, starts heat button 24, and temperature reset button 25, stops heat button 26
Described physical parameter control module comprises temperature controller 19, for showing the temperature of heating kettle cover 18 and stretching kettle 33; Tensimeter 20, for showing the pressure in stretching kettle 33; Maintenance pressure valve 21, for controlling the pressure size of curing water mud; Pressure head pressurizing valve 22, is added in the test pressure on Behavior of Hardened Cement Paste for restrained stretching while experiment, power switch 23 starts heater switch 24, temperature reset switch 25 and stop heater switch 26.
Described physical parameter control module according to the steering order of the pressure signal of pressure control unit input and the input of signal analysis control processing module by the high pressure of output, maintenance, temperature control signals is exported to described cement extension test assembly, controls its operation.
Fig. 3 is autoclave body structural representation;
Fig. 4 is the structural representation of autoclave body upper cover;
Autoclave body upper cover 29 suitable for reading 40, left mouthful 41, right mouthful 42; Piston 30 pushes into suitable for reading 40 of stretching kettle upper cover 29; Pressure head pressurizing adaptor 28 is screwed into left mouthful 41 of stretching kettle upper cover 29; Maintenance compression fittings 27 is screwed into right mouthful 42 of stretching kettle upper cover 29; Autoclave body upper cover 29 is screwed to the top of stretching kettle 33.
Fig. 5 is drawing die schematic diagram;
By in the thin short hole that is inserted into drawing die cylindrical shell 38 of stretching pressure-bearing post 36, to injected water mud in drawing die cylindrical shell 38 to drawing die cylindrical shell 38 coboundary 2-3mm places, drawing die upper cover 37 is dropped on cement surface.
Figure 6 shows that the experimental result of a mortar architecture tensile stress-strain.Experiment condition: maintenance pressure 20MPa, curing temperature 100, curing time 2d.Grout formula: good magnificent G level oil well cement+0.5%DZH+6%FSAM+0.44H
2o
Experimental analysis: Fig. 6 Behavior of Hardened Cement Paste tensile stress strain curve, wherein curve is stress-strain diagram, straight line is temperature line.Reach maximal value at a point load, Behavior of Hardened Cement Paste generation brittle failure, the tensile strength of this Behavior of Hardened Cement Paste is 1.25MPa.
Figure 7 shows that the experimental result of a mortar architecture tensile stress-strain.Experiment condition: maintenance pressure 21MPa, 140 ℃ of curing temperatures, curing time 2d.Grout formula: good magnificent G level oil well cement+0.5%DZH+6%FSAM+0.5% fiber+0.44H
2o
Experimental analysis: Fig. 7 is the Behavior of Hardened Cement Paste tensile stress strain curve that is added with fiber, and Behavior of Hardened Cement Paste under tension acts on a point Article 1 crack occurs, and cracking strength is now 2.71MPa; Behavior of Hardened Cement Paste continuation under tension acts on b point and is pulled off, and the tensile strength of Behavior of Hardened Cement Paste is 3.27MPa.
According to above-described embodiment, a kind of oil well cement high temperature high pressure tensile stress-strain system that the invention provides is described, can, under the temperature, pressure of maintenance, measure the tensile strength of oil well cement, and record temperature, pressure curve, tension stress strain curve.This oil well cement high temperature high pressure tensile stress-strain system is mainly made up of seven parts such as autoclave body and sample cup, special pressing mechanism, Precision Test System, precision pressure source, temperature control system, pipe system, COMPUTER DETECTION and data handling systems.Its principal feature is: the curing condition of High Temperature High Pressure under 1. can simulation well; 2. experimental pressure is adjustable, and experimental temperature is controlled automatically, and both all can show in real time; 3. the Behavior of Hardened Cement Paste tensile stress strain curve of measuring by precise displacement sensor shows in real time; 4. test simple to operately, laboratory report is exported and preserve, automatically generated to experimental result automatically; 5. apparatus structure is rationally distributed, and outward appearance is succinct.
Succeeding in developing of this experimental apparatus, can simulate downhole temperature, pressure, measure Behavior of Hardened Cement Paste tensile strength, measure the tensile stress strain curve of Behavior of Hardened Cement Paste, be convenient to judge the fragility of cement system, be suitable for and optimize mortar architecture design, thereby have very broad application prospects, can produce significant economic results in society.
Claims (8)
1. oil well cement high temperature high pressure tensile stress-strain system, is characterized in that, described system comprises cement extension test assembly, power supply and pressure control unit, temperature conditioning unit, signal controlling processing unit and pipeline;
Cement to be measured is injected to described cement extension test assembly, and described pressure control unit and temperature conditioning unit are according to the pressure and temperature of cement extension test assembly described in the control signal control of described signal controlling processing unit output; Test signal is exported to signal controlling processing unit by described cement extension test assembly, obtains the drawing stress result of cement to be measured;
In described system, also comprise displacement transducer (16), described displacement transducer (16) is arranged in described cement extension test assembly, the small distortion of depressing outside for test water mudstone, and deformation data are exported to described signal controlling processing unit;
Described cement extension test assembly comprises autoclave body and drawing die; Described drawing die is arranged in described autoclave body;
Described autoclave body comprises described displacement transducer (16), maintenance compression fittings (27), maintenance pressure hose (14), pressure head pressurizing adaptor (28), pressure head pressurization sebific duct (15), stretching kettle upper cover (29), piston (30), cushion rubber group (31) (34), drawing die (32), stretching kettle lower cover (35), stretching kettle (33), heating kettle cover (18);
Described displacement transducer (16) is arranged in oil well cement high temperature high pressure tensile stress-strain instrument (44); It is upper that displacement transducer (16) is connected to piston (30), and piston (30) pushes into (40) suitable for reading of stretching kettle upper cover (29); One of them cushion rubber (31) is enclosed within the short slot of stretching kettle upper cover (29); Maintenance pressure hose (14) is linked on maintenance compression fittings (27); Maintenance compression fittings (27) is screwed into right mouthful (42) of stretching kettle upper cover (29); Pressure head pressurization sebific duct (15) is linked on pressure head pressurizing adaptor (28); Pressure head pressurizing adaptor (28) is screwed into left mouthful (41) of stretching kettle upper cover (29); Another cushion rubber (34) is enclosed within the short slot of stretching kettle lower cover (35); Stretching kettle lower cover (35) is screwed to the bottom of stretching kettle (33); Drawing die (32) is put into stretching kettle (33); Stretching kettle upper cover (29) is screwed to the top of stretching kettle (33); Stretching kettle (33) is fallen into heating kettle cover (18);
Described drawing die comprises stretching pressure-bearing post (36), drawing die upper cover (37) and drawing die cylindrical shell (38); The taper end of stretching pressure-bearing post (36) is inserted in the hole of drawing die cylindrical shell (38), drawing die upper cover (37) is dropped on cement surface.
2. oil well cement high temperature high pressure tensile stress-strain system according to claim 1, is characterized in that,
Described pressure control unit comprises pressure source, power switch, tensimeter group and valve sets; Described tensimeter group comprises input pressure pressure table (9), for showing the pressure size of air compressor (1) to the input of precision pressure source; Output pressure is pressed table (8), for showing the pressure size of precision pressure source to oil well cement high temperature high pressure compressed stress-strain gage (44) input; Described valve sets comprises water source valve (10), is input to the water yield in precision pressure source for controlling water source (7); High voltage output valve (11), is input to the air capacity in precision pressure source for controlling air compressor (1); Compression rate variable valve (12), is input to the speed of oil well cement high temperature high pressure tensile stress-strain instrument (44) pressure for controlling precision pressure source; Pressure-regulating valve (39) is input to the pressure size of oil well cement high temperature high pressure tensile stress-strain instrument (44) for controlling precision pressure source;
Respectively and water source, power supply connects in described pressure control unit one end, and exports by described valve sets controlled pressure and water source; The other end is transferred to the signal of output the port of described cement extension test assembly by described signal controlling processing unit.
3. oil well cement high temperature high pressure tensile stress-strain system according to claim 2, is characterized in that, compression rate can range of adjustment at 0-15MPa/S.
4. oil well cement high temperature high pressure tensile stress-strain system according to claim 1, is characterized in that,
Described temperature conditioning unit comprises thermopair (17), heating kettle cover (18), temperature controller (19);
Described thermopair (17) is arranged in oil well cement high temperature high pressure tensile stress-strain instrument (44); Heating kettle cover (18) upper surface has a heating kettle trepanning (43); Thermopair (17) inserts in heating kettle trepanning (43); Thermopair (17) is for measuring the temperature of described heating kettle cover (18) and stretching kettle (33), and this temperature shows in temperature controller (19);
Described heating kettle cover (18) is arranged in operator's console (45), and described operator's console is used for placing stretching kettle (33);
The top of described oil well cement high temperature high pressure tensile stress-strain instrument (44) is physical parameter control module panel (5), and bottom is operator's console (45);
Described temperature controller is arranged in described signal controlling processing unit in physical parameter control module, for controlling output temperature.
5. oil well cement high temperature high pressure tensile stress-strain system according to claim 1, is characterized in that,
Described signal controlling processing unit comprises every physical parameter control module and signal analysis control processing module;
Described physical parameter control module comprises temperature controller (19), for showing the temperature of heating kettle cover (18) and stretching kettle (33); Tensimeter (20), for showing the pressure in stretching kettle (33); Maintenance pressure valve (21), for controlling the pressure size of curing water mud; Pressure head pressurizing valve (22), is added in the test pressure on Behavior of Hardened Cement Paste for restrained stretching while experiment, power switch (23) starts heater switch (24), temperature reset switch (25) and stop heater switch (26);
Described physical parameter control module according to the steering order of the pressure signal of pressure control unit input and the input of signal analysis control processing module by the high pressure of output, maintenance, temperature control signals is exported to described cement extension test assembly, controls its operation;
The result of detection is exported to described signal analysis control processing module by described cement extension test assembly, and show output.
6. oil well cement high temperature high pressure tensile stress-strain system according to claim 2, is characterized in that,
Described pipeline (2) is arranged between described air compressor (1) and pressure control unit (3), between described water source (7) and pressure control unit (3), between described oil well cement high temperature high pressure tensile stress-strain instrument (44) and pressure control unit, be fastening means;
Described pressure source is air compressor.
7. the method that the described tensile stress-strain system of one of application rights requirement 1～6 is tested oil well cement, is characterized in that, described method comprises the steps:
Step 1: preliminary work
Connect source of the gas, power supply, the water source of pressure control unit; Each valve of pressure control unit and switch, all in off-position, connect the power supply of system, connect the power supply of computing machine, and with system communication line, open computing machine and enter control program unit;
Step 2: sample preparation
Application drawing die, after being coated with to vaseline, inserts in drawing die cylindrical shell (38) on stretching pressure-bearing post (36), so far can be to injected water mud in mould, grout face is from drawing die cylindrical shell (38) coboundary 2-3mm position, again drawing die upper cover (37) is dropped on cement surface, complete the assembling of drawing die and the injection process of grout; And open kettle upper cover (29) drawing die (32) is put into stretching kettle (33);
Maintenance compression fittings (27), the pressure head pressurizing adaptor (28) of the maintenance pressure hose (14) of system and pressure head pressurization sebific duct (15) being received respectively to kettle upper cover are upper, and the displacement transducer of screwing on (16) is plugged the thermopair (17) of described temperature conditioning unit;
Step 3: the maintenance of heating, pressurize
Open system power supply switch, open the water source valve of pressure control unit, High voltage output valve, opens the maintenance pressure valve (21) in the physical parameter control module of described signal controlling processing unit, opens heater switch, is plugged described thermopair; When temperature control enters constant temperature zone, carry out ftercompction; Close water source valve, open the compression rate variable valve (12) of described pressure control unit, clockwise direction is twisted the pressure-regulating valve (39) of described pressure control unit again, because entering pressurized cylinder, gas needs equilibration time, described pressure-regulating valve (39) regulates and should slowly carry out, before high pressure reaches predetermined pressure soon, stop regulating, observe pressure; After 5 minutes, slowly regulate once again, reach predetermined pressure; Grout is pressed the maintenance of preset temperature pressure;
Step 4: the test operation of tension stress strain
The signal analysis control processing module of described signal controlling processing unit is carried out step control, closes described maintenance pressure valve (21), opens the pressure head pressurizing valve (22) of the physical parameter control module of described signal controlling processing unit; The compression rate variable valve of closing presure control module, regulates bleed pressure to 0.4Mpa with described pressure-regulating valve; Open described compression rate variable valve, pressurization starts, and computer screen shows test curve.
8. the method for test according to claim 7, is characterized in that, input pressure value range 0-69.1MPa, and Range of measuring temp is at 25-175 ℃.
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| CN103395114B (en) * | 2013-07-19 | 2015-06-17 | 嘉华特种水泥股份有限公司 | Method for maintaining oil-well cement |
| CN103324214B (en) * | 2013-07-19 | 2015-09-16 | 嘉华特种水泥股份有限公司 | A kind of constant-pressure pressure control method for Oil well cement maintenance kettle |
| CN110318735B (en) * | 2018-03-27 | 2022-05-13 | 中国石油化工股份有限公司 | Well cementation set cement damage monitoring device and data collection method |
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