CN102401769B - Oil well cement high-temperature high-pressure compressive stress strain system and test method thereof - Google Patents
Oil well cement high-temperature high-pressure compressive stress strain system and test method thereof Download PDFInfo
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- CN102401769B CN102401769B CN2010102778419A CN201010277841A CN102401769B CN 102401769 B CN102401769 B CN 102401769B CN 2010102778419 A CN2010102778419 A CN 2010102778419A CN 201010277841 A CN201010277841 A CN 201010277841A CN 102401769 B CN102401769 B CN 102401769B
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Abstract
The invention relates to an oil well cement high-temperature high-pressure compressive stress strain system comprising a cement compression testing module, a power source, a pressure controlling unit, a temperature controlling unit, a signal controlling and processing unit, and pipelines. With the invention, temperature and pressure of bottom hole maintenance can be simulated. The compressive stress of oil well cement stones can be continuously measured under the temperature and pressure, and a temperature-pressure curve and a compressive stress-strain curve can be recorded. With the system and the method, anti-compression properties of different cement slurry systems can be directly measured and compared. The system and the method are beneficial for the design of cement slurry formulas. With the system and the method, cement slurry systems satisfying in-field construction requirements can be 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 compressed ess-strain system, the compressive stress strain of static condition maintenance under the energy simulation well, mensuration Behavior of Hardened Cement Paste different time, and incompressible ess-strain performance.
Background technology
At present less for the indoor test method of the incompressible ess-strain of Behavior of Hardened Cement Paste, use for reference to a great extent the Concrete Industry testing standard, the 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 compression strenght of Behavior of Hardened Cement Paste, elastic modulus, stress/strain, existing measuring equipment takes as feeding hydraulic pressure the Behavior of Hardened Cement Paste compressive strength that pressing machine can only be measured normal temperature and pressure, can't analogue measurement shaft bottom high-temperature and high-pressure conditions under cement strength certainly also can not realize the real time record of experimental data.The 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:
Current Concrete Industry build-in test compressive strength, elastic modulus and stress/strain: it is 2.54cm that the cement slurry prepared is injected to diameter, height is in the die trial of 2.54cm, be placed under assigned temperature maintenance to regulation after the length of time, test compressive strength, elastic modulus and stress/strain curves (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.
" 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, the prior art weak point is embodied in: at present for Behavior of Hardened Cement Paste compressive strength, the indoor test method of ess-strain is less, the surveying instrument function singleness, also do not have a kind of integrated equipment can in the curing water mudstone, measure the compression strenght of Behavior of Hardened Cement Paste, the technical parameters such as ess-strain, existing measuring equipment as YAW-300BI type hydraulic servo press and CSS-2205 electronic universal tester all, 1 can't realize carrying out incompressible strength test simultaneously, 2 and can not be for the measurement under high-temperature and high-pressure conditions, 3 can not realize the real time record of experimental data, the relation that can not reflect stress and strain.For the above-mentioned state of the art, the applicant has carried out the research of this patent.
Summary of the invention
The present invention is directed to the technical matters existed in prior art, researched and developed the present invention, oil well cement high temperature high pressure compressed ess-strain system and method for testing thereof, the invention provides a kind of oil well cement high temperature high pressure compressed stress-strain gage, make grout carry out maintenance under the simulation downhole condition, this instrument can be simulated in well under high-temperature and high-pressure conditions the directly compressive stress strain curve of test water mudstone, with the elasticity of test water mudstone; 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 compressed ess-strain system, described system comprises cement compression verification 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 compression verification assembly, and described pressure control unit and temperature conditioning unit are controlled the pressure and temperature of described cement compression verification assembly according to the control signal of described signal controlling processing unit output; Described cement compression verification assembly is exported to the signal controlling processing unit by test signal, obtains the compression stress result of cement to be measured.The fastening means that described pipeline 2 is air compressor 1 and pressure control unit 3, water source 7 and pressure control unit 3, oil well cement high temperature high pressure compressed stress-strain gage 44 and pressure control unit 3; Described pressure source is air compressor.
Also comprise displacement transducer in described system, described displacement transducer is arranged in described cement compression verification assembly, the small distortion of depressing outside for the test water mudstone, and the deformation data are exported to described signal controlling processing unit.
Described cement compression verification assembly comprises autoclave body and compression mould; Described compression mould 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, compression mould, kettle lower cover;
Described displacement transducer 16 is arranged in oil well cement high temperature high pressure compressed stress-strain gage 44, and on connection and piston 30, piston 30 pushes into suitable for reading 40 of compression kettle upper cover 29;
Cushion rubber 31 is enclosed within the short slot of compression kettle upper cover 29; Maintenance compression fittings 27 is screwed into right mouthful 42 of compression kettle upper cover 29; Pressure head pressurizing adaptor 28 is screwed into left mouthful 41 of compression kettle upper cover 29; Cushion rubber 34 is enclosed within the short slot of compression kettle lower cover 35; Compression kettle lower cover 35 is screwed to the bottom of compression kettle 33; Compression kettle 33 is put in compression mould combination 32; Compression kettle upper cover 29 is screwed to the top of compression kettle 33.
Described compression mould comprises the compression mould upper cover, and the compression mould cylinder, at the bottom of the mould cup at the bottom of piston and compression mould cup;
Piston 38 at the bottom of the mould cup is pushed at the bottom of the compression mould cup to 39 indentation, there, and be contained in together the bottom of compression mould cylinder 37, to injected water mud in compression mould cylinder 37, the slurry face, to compression mould cylinder 37 coboundary 3-5mm, then drops on compression mould upper cover 36 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 showing the pressure size of air compressor 13 inputs to the precision pressure source; 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 in precision pressure source 3 for controlling water source 7; High voltage output valve 11, be input to the air capacity in precision pressure source 3 for controlling air compressor 1; Compression rate variable valve 12, be 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 46 is input to the pressure size of oil well cement high temperature high pressure compressed stress-strain gage 44 for controlling precision pressure source 3.
Respectively and water source, power supply connects 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 compression verification assembly by described signal controlling processing unit.
Compression rate can range of adjustment at 0-15MPa/S.
Described electroheat pair 17 is arranged in oil well cement high temperature high pressure compressed stress-strain gage 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 compression 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 compression kettle 33.
The top of described oil well cement high temperature high pressure compressed stress-strain gage 44 is general control panels 5, and bottom is operator's console 45.
Described temperature controller 19 is arranged in described signal controlling processing unit in physical parameter control module 5, 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 compression kettle 33; Tensimeter 20, for showing the pressure in compression kettle 33; Maintenance pressure valve 21, for controlling the pressure size of curing water mud; Pressure head pressurizing valve 22, be added in the test pressure on Behavior of Hardened Cement Paste when controlling compression experiment, and power switch 23 starts heater switch 24, temperature reset switch 25 and stop heater switch 26;
The pressure signal that described physical parameter control module is inputted according to pressure control unit and signal analysis are controlled the steering order of processing module input by the high pressure of output, maintenance, and temperature control signals is exported to described cement compression verification assembly, controls its operation;
Described cement compression verification assembly is exported to described signal analysis by the result of detection and is controlled processing module, and shows output.
Another innovation of the present invention is, applies the method that described compression stress strain system is tested oil well cement, and 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 instrument, connect the power supply of computing machine, and and the instrument communication line, open computing machine and enter the control program unit;
Step 2: sample preparation
The applied compression mould, described compression mould comprises at the bottom of compression mould upper cover, compression mould cylinder, mould cup at the bottom of piston and compression mould cup; At first by described compression mould jacket casing at the bottom of the compression mould cup, be coated with vaseline oil in the junction of two each other, pour grout into, grout identity distance upper limb 3-5 millimeter, put described compression mould upper cover, opens the still upper cover, compression mould is put into to still, the still upper cover of screwing on;
The maintenance pressure hose of system and pressure head pressurization sebific duct is received respectively on the maintenance compression fittings, pressure head pressurizing adaptor of kettle upper cover, the displacement transducer of screwing on, plug thermopair;
Step 3: the maintenance of heating, pressurize
Open the system power supply switch, open the water source valve of pressure control unit, the High voltage output valve, open the maintenance pressure valve on instrument panel, opens heater switch, is plugged thermopair; Temperature is controlled while entering constant temperature zone, carries out ftercompction; Close the water source valve, open the 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 is regulated and should slowly be carried out, and before high pressure reaches predetermined pressure soon, stops regulating, and observes pressure; Slowly regulate once again after 5 minutes, reach predetermined pressure; Grout is pressed the maintenance of preset temperature pressure;
Step 4: the test operation of compression stress strain
Signal analysis is controlled processing module and is carried out step control, closes instrument maintenance pressure valve, opens the pressure head pressurizing valve; The compression rate variable valve of closing presure control module, regulate bleed pressure to 0.4Mpa with pressure-regulating valve; Open the 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 characteristics that the present invention adopts above-mentioned technical scheme to reach are as follows:
(1) multifunctionality
Utilize this invention: but 1. artificial ground (temperature and pressure) is realized the High Temperature High Pressure maintenance to Behavior of Hardened Cement Paste; 2. can, under high-temperature and high-pressure conditions, realize the evaluation to the compressive stress strain curve of the different curing age of Behavior of Hardened Cement Paste; 3. can, under high-temperature and high-pressure conditions, test incompressible intensity.
(2) intuitive
Utilize this invention: the compressive 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 be regulated (0-15MPa/S); When experimental system surpasses setting range due to reason build-ups of pressure such as temperature, system can reduce pressure automatically, realizes the 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 and processes.
(5) system adopts computer program to control computer data processing system
Temperature, pressure, displacement signal are obtained by computing machine and controller communication, and computing machine is processed these signals through data, on computer screen, show, 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 stress of continuous coverage hardened oilwell cement, and record the temperature, pressure curve, the compression stress strain curve.Experiment top pressure 69.1MPa, 175 ℃ of maximum temperatures, be conducive to visual test and contrast the anti-compression properties of different mortar architectures, is conducive to carry out the design of grout formula, is met the mortar architecture of site operation demand.
The accompanying drawing explanation
Fig. 1 is the system schematic of system of the present invention;
Fig. 2 is the panel schematic diagram of physical parameter control module in the signal controlling processing unit;
Fig. 3 is the autoclave body structural representation;
Fig. 4 is the structural representation of autoclave body upper cover;
Fig. 5 is the compression mould schematic diagram;
Figure 6 shows that the experimental result picture of embodiment 1 mortar architecture compression stress strain;
Figure 7 shows that the experimental result picture of embodiment 2 mortar architecture compression stress strains;
Below in conjunction with embodiment, be illustrated.
Embodiment
Fig. 1 is oil well cement high temperature high pressure compressed ess-strain system diagram, wherein: air compressor 1 pipe system 2, pressure control unit 3, power supply 4, physical parameter control module panel 5, processing module 6 is controlled in signal analysis, 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, heating kettle trepanning 43, oil well cement high temperature high pressure compressed stress-strain gage 44, operator's console 45, pressure-regulating valve 46
Power supply 4 is controlled processing module 6 with pressure control unit 3, oil well cement high temperature high pressure compressed stress-strain gage 44, signal analysis respectively and is connected; Air compressor 1, water source 7 are linked on pressure control unit 3, then link on oil well cement high temperature high pressure compressed stress-strain gage 44; Oil well cement high temperature high pressure compressed stress-strain gage 44 is controlled processing module 6 with signal analysis and is connected.
The top of oil well cement high temperature high pressure compressed stress-strain gage 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.
Maintenance pressure hose 14, pressure head pressurization sebific duct 15, displacement transducer 16, electroheat pair 17 is arranged in oil well cement high temperature high pressure compressed stress-strain gage 44.
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 46 are arranged in pressure control unit 3.
Fig. 2 is the panel schematic diagram of physical parameter control module in the signal controlling processing unit; Wherein, temperature controller 19, tensimeter 20, maintenance pressure valve 21, pressure head pressurizing valve 22, power switch 23, start heat button 24, and temperature reset button 25, stop heat button 26
Described physical parameter control module comprises temperature controller 19, for showing the temperature of heating kettle cover 18 and compression kettle 33; Tensimeter 20, for showing the pressure in compression kettle 33; Maintenance pressure valve 21 is 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 when controlling compression experiment, and power switch 23 starts heater switch 24, temperature reset switch 25 and stop heater switch 26.
The pressure signal that described physical parameter control module is inputted according to pressure control unit and signal analysis are controlled the steering order of processing module input by the high pressure of output, maintenance, and temperature control signals is exported to described cement extension test assembly, controls its operation.
Fig. 3 is the autoclave body structural representation;
Displacement transducer 16 is connected on piston 30, and piston 30 pushes into suitable for reading 40 of compression kettle upper cover 29; Cushion rubber 31 is enclosed within the short slot of compression 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 compression 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 compression kettle upper cover 29; Cushion rubber 34 is enclosed within the short slot of compression kettle lower cover 35; Compression kettle lower cover 35 is screwed to the bottom of compression kettle 33; Compression mould 32 is put into compression kettle 33; Compression kettle upper cover 29 is screwed to the top of compression kettle 33; To compress kettle 33 and fall into heating kettle cover 18.
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 compression kettle upper cover 29; Pressure head pressurizing adaptor 28 is screwed into left mouthful 41 of compression kettle upper cover 29; Maintenance compression fittings 27 is screwed into right mouthful 42 of compression kettle upper cover 29; Autoclave body upper cover 29 is screwed to the top of compression kettle 33.
Fig. 5 is the compression mould schematic diagram;
Figure 6 shows that the experimental result of embodiment 1 mortar architecture compression stress strain.Experiment condition: maintenance pressure 20MPa, 100 ℃ of curing temperatures, 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 compression stress strain curve, wherein red line is stress-strain diagram.A → b Behavior of Hardened Cement Paste enters the compressible stage, and ram pressures keeps under condition that 2MPa is constant, and strain value constantly increases; B → c section Behavior of Hardened Cement Paste enters elastic stage, and along with ram pressures raises, the Behavior of Hardened Cement Paste deflection increases gradually, until the c point starts to occur permanent strain, from the c point, starts Behavior of Hardened Cement Paste by pressure break (7.8MPa).
In b → c section Behavior of Hardened Cement Paste generation plastic yield, the elastic modulus of this known Behavior of Hardened Cement Paste of stage,
E: elastic modulus f: the power e of unit area: strain (dimensionless)
Figure 7 shows that the experimental result of embodiment 2 mortar architecture compression stress strains.Experiment condition: maintenance pressure 21MPa, 100 ℃ of curing temperatures, curing time 2d.Grout formula: good magnificent G level oil well cement+0.5%DZH+6%FSAM+0.44H
2O
Experimental analysis: Fig. 7 Behavior of Hardened Cement Paste compression stress strain curve, A → B Behavior of Hardened Cement Paste enters the compressible stage, and ram pressures keeps under condition that 2MPa is constant, and strain value constantly increases; B → C section Behavior of Hardened Cement Paste enters elastic stage, and along with ram pressures raises, the Behavior of Hardened Cement Paste deflection increases gradually, until the C point starts to occur permanent strain, from the C point, starts Behavior of Hardened Cement Paste by pressure break (12.7MPa).In B → C section Behavior of Hardened Cement Paste generation plastic yield, the elastic modulus of this known Behavior of Hardened Cement Paste of stage (E=f/e) is 507MPa.
According to above-described embodiment, a kind of oil well cement high temperature high pressure compressed ess-strain system that the invention provides is described, can, under the temperature, pressure of maintenance, measure the compressive strength of oil well cement, and record temperature, compressive stress strain curve.This oil well cement high temperature high pressure compressed stress-strain gage mainly is comprised 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: but the 1. curing condition of High Temperature High Pressure under 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 compression 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 compressive strength, elastic modulus, compression stress strain, elasticity with the judgement Behavior of Hardened Cement Paste, be suitable for and optimize the 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 compressed ess-strain system, is characterized in that, described system comprises cement compression verification 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 compression verification assembly, and described pressure control unit and temperature conditioning unit are controlled the pressure and temperature of described cement compression verification assembly according to the control signal of described signal controlling processing unit output; Described cement compression verification assembly is exported to the signal controlling processing unit by test signal, obtains the compression stress result of cement to be measured;
Also comprise displacement transducer (16) in described system, described displacement transducer (16) is arranged in described cement compression verification assembly, the small distortion of depressing outside for the test water mudstone, and the deformation data are exported to described signal controlling processing unit;
Described cement compression verification assembly comprises autoclave body and compression mould; Described compression mould is arranged in described autoclave body;
Described autoclave body comprises described displacement transducer (16), maintenance pressure hose (14), pressure head pressurization sebific duct (15), maintenance compression fittings (27), pressure head pressurizing adaptor (28), compression kettle upper cover (29), piston (30), cushion rubber group (31) (34), compression mould (32), compression kettle (33), compression kettle lower cover (35);
Described displacement transducer (16) is arranged in oil well cement high temperature high pressure compressed stress-strain gage (44), and described displacement transducer (16) is connected with piston (30), and described piston (30) pushes into (40) suitable for reading of compression kettle upper cover (29);
Cushion rubber (31) is enclosed within the short slot of compression 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 compression 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 compression kettle upper cover (29); Cushion rubber (34) is enclosed within the short slot of compression kettle lower cover (35); Compression kettle lower cover (35) is screwed to the bottom of compression kettle (33); Compression mould (32) is put into compression kettle (33); Compression kettle upper cover (29) is screwed to the top of compression kettle (33);
Described compression mould comprises compression mould upper cover (36), and compression mould cylinder (37), at the bottom of piston at the bottom of the mould cup (38) and compression mould cup (39);
By the indentation, there of (39) at the bottom of at the bottom of the mould cup, piston (38) pushes the compression mould cup, and jointly be assembled in the bottom of compression mould cylinder (37), described compression mould upper cover (36) drops on cement surface.
2. oil well cement high temperature high pressure compressed ess-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), be input to the air capacity in precision pressure source for controlling air compressor (1); Compression rate variable valve (12), be input to the speed of oil well cement high temperature high pressure compressed stress-strain gage (44) pressure for controlling the precision pressure source; Pressure-regulating valve (46) is input to the pressure size of oil well cement high temperature high pressure compressed stress-strain gage (44) for controlling the precision pressure source;
Respectively and water source, power supply connects 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 compression verification assembly by described signal controlling processing unit.
3. oil well cement high temperature high pressure compressed ess-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 compressed ess-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 compressed stress-strain gage (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 heating kettle cover (18) and compression kettle (33), and this temperature shows in temperature controller (19);
The top of described oil well cement high temperature high pressure compressed stress-strain gage (44) is general control panel (5), and bottom is operator's console (45);
Described heating kettle cover (18) is arranged in operator's console (45), and its effect is for placing compression kettle (33);
Described temperature controller (19) is arranged in described signal controlling processing unit in the physical parameter control module, for showing output temperature.
5. oil well cement high temperature high pressure compressed ess-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 compression kettle (33); Tensimeter (20) is for showing the pressure in compression kettle (33); Maintenance pressure valve (21) is 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 when controlling compression experiment, and power switch (23) starts heater switch (24), temperature reset switch (25) and stop heater switch (26);
The pressure signal that described physical parameter control module is inputted according to pressure control unit and signal analysis are controlled the steering order of processing module input by the high pressure of output, maintenance, and temperature control signals is exported to described cement compression verification assembly, controls its operation;
Described cement compression verification assembly is exported to described signal analysis by the result of detection and is controlled processing module, and shows output.
6. oil well cement high temperature high pressure compressed ess-strain system according to claim 2, is characterized in that,
The connecting path that described pipeline (2) is air compressor (1) and pressure control unit (3), water source (7) and pressure control unit (3), oil well cement high temperature high pressure compressed stress-strain gage (44) and pressure control unit (3);
Described pressure source is air compressor.
7. the method that the described compression 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 instrument, connect the power supply of computing machine, and and the instrument communication line, open computing machine and enter the control program unit;
Step 2: sample preparation
The applied compression mould, described compression mould comprises at the bottom of compression mould upper cover, compression mould cylinder, mould cup at the bottom of piston and compression mould cup; At first by described compression mould jacket casing at the bottom of the compression mould cup, be coated with vaseline oil in the junction of two each other, pour grout into, grout identity distance upper limb 3-5 millimeter, put described compression mould upper cover, opens the still upper cover, compression mould is put into to still, the still upper cover of screwing on;
The maintenance pressure hose of system and pressure head pressurization sebific duct is received respectively on the maintenance compression fittings, pressure head pressurizing adaptor of kettle upper cover, the displacement transducer of screwing on, plug thermopair;
Step 3: the maintenance of heating, pressurize
Open the system power supply switch, open the water source valve of pressure control unit, the High voltage output valve, open the maintenance pressure valve on instrument panel, opens heater switch, is plugged thermopair; Temperature is controlled while entering constant temperature zone, carries out ftercompction; Close the water source valve, open the 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 is regulated and should slowly be carried out, and before high pressure reaches predetermined pressure soon, stops regulating, and observes pressure; Slowly regulate once again after 5 minutes, reach predetermined pressure; Grout is pressed the maintenance of preset temperature pressure;
Step 4: the test operation of compression stress strain
Signal analysis is controlled processing module and is carried out step control, closes instrument maintenance pressure valve, opens the pressure head pressurizing valve; The compression rate variable valve of closing presure control module, regulate bleed pressure to 0.4Mpa with pressure-regulating valve; Open the 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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| CN104070596B (en) * | 2014-06-24 | 2016-04-27 | 中国海洋石油总公司 | A kind of superhigh temperature hardened oilwell cement curing autoclave and using method thereof |
| CN107575210A (en) | 2016-11-30 | 2018-01-12 | 中国石油天然气股份有限公司 | Method for evaluating elasticity of well cementation set cement of oil and gas well |
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| CN2739636Y (en) * | 2004-11-03 | 2005-11-09 | 新疆石油管理局钻井工艺研究院 | High temperature high pressure curing kettle |
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