CN108613882A - A kind of experimental rig that simulation hydration influences rock strength and test method - Google Patents
A kind of experimental rig that simulation hydration influences rock strength and test method Download PDFInfo
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- CN108613882A CN108613882A CN201810687678.XA CN201810687678A CN108613882A CN 108613882 A CN108613882 A CN 108613882A CN 201810687678 A CN201810687678 A CN 201810687678A CN 108613882 A CN108613882 A CN 108613882A
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- 239000011435 rock Substances 0.000 title claims abstract description 215
- 230000036571 hydration Effects 0.000 title claims abstract description 59
- 238000006703 hydration reaction Methods 0.000 title claims abstract description 59
- 238000004088 simulation Methods 0.000 title claims abstract description 44
- 238000010998 test method Methods 0.000 title claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 74
- 238000002347 injection Methods 0.000 claims abstract description 37
- 239000007924 injection Substances 0.000 claims abstract description 37
- 239000012530 fluid Substances 0.000 claims abstract description 35
- 238000002474 experimental method Methods 0.000 claims abstract description 6
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
- 241000237858 Gastropoda Species 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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Abstract
The present invention provides a kind of experimental rig that simulation hydration influences rock strength and test method, experimental rig includes that liquid injection system, axis press loading system, confining pressure loading system, and liquid injection system includes liquid reserve tank and the fluid injection pipeline being connect with liquid reserve tank；Axis pressure loading system includes pressurization disk and the first driving means that are connect with pressurization disk；Confining pressure loading system includes two pressure plates and two the second driving devices being connect respectively with two pressure plates, and two pressure plates pass through the periphery wall that make-up surrounds rock core.Test method includes：Rock core is placed between two pressure plates and axially aligns pressurization disk；Fluid injection pipeline is inserted into rock core；Liquid in liquid reserve tank is heated to set temperature and is injected in rock core；Start first driving means and the second driving device to apply axis pressure and confining pressure to rock core；Removal of core；Rock core is cut, point load experiment is carried out to core block.The present invention can simulate influence of the hydration to rock strength under true strata pressure environment.
Description
Technical field
The present invention relates to oil gas drilling field of engineering technology, what especially a kind of simulation hydration influenced rock strength
Experimental rig and test method.
Background technology
With deeply developing for offshore oil and gas resource, conventional straight well and directional well cannot meet exploratory engineering of off-shore petroleum/gas reservoir with
Exploitation, in order to meet production needs, more producing wells are shallow-layer, deep layer extended reach well.Since the soil property of ocean shallow-layer compares
Loose, during carrying out shallow drilling, shallow stratum influenced easily to occur caving in by hydration, undergauge, chip off-falling etc. are multiple
Miscellaneous borehole well instability problem, so as to cause drilling tool blocked portion, drillng operation timeliness is low, even results in big displacement section wellbore development length
It is limited, great adverse effect is caused to the exploration and development of Sea area.Therefore, accurately understand hydration to superficial part
The layer mechanical characteristic of rock and the affecting laws of failure mechanism differentiate and predict wall strength, borehole wall stability and borehole collapse
Period has important practical significance to safety drilling engineering.
Currently, the method that indoor test hydration influences stratum rock strength is：Rock core is immersed in room temperature first
Triaxial tests measuring apparatus is recycled with simulation rock hydration to certain time length in drilling fluid or water flooding under normal pressure
The intensity of rock.In this test method, liquid is freely accessible to rock core, differs greatly with true strata pressure environment,
Under true ground environment, rock core had not only subject the overlying gravity of upper formation rock and wherein fluid, but also subject and come from
The confining pressure of formation rock and fluid acts on, and in practical drilling process, drilling fluid be from internal wellbore into stratum
Intrusion, and drilling fluid is that have certain flowing velocity, and nonstatic.Therefore, above-mentioned test method be it is a kind of not
Meet the test method of wellbore fluids invaded formation actual conditions, therefore a set of economy of research is simple and direct and meets actual indoor survey
Method for testing and device are the task of top priority for solving unconsolidated formation drilling shaft lining aquation destabilization problems.
Invention content
The object of the present invention is to provide a kind of experimental rig that simulation hydration influences rock strength and test method,
To simulate influence of the hydration to rock strength under true strata pressure environment, consequently facilitating differentiate and prediction wall strength,
Borehole wall stability and borehole collapse period.
In order to achieve the above objectives, the present invention proposes a kind of experimental rig that simulation hydration influences rock strength,
Including：Liquid injection system includes liquid reserve tank for accommodating liquid and is connect with the liquid reserve tank and can inject liquid into rock core
Internal fluid injection pipeline；Axis presses loading system, includes the pressurization disk being coaxially disposed with the rock core and connects with the pressurization disk
The first driving means for connecing and the pressurization disk capable of being driven to be moved towards the rock core；Confining pressure loading system, including it is set to the rock
Two pressure plates of heart both sides and two the second driving devices being connect respectively with two pressure plates, two described second drive
Dynamic device can respectively drive two pressure plates and be moved towards the rock core, and two pressure plates surround the rock core by make-up
Periphery wall, and be bonded with the periphery wall of the rock core.
The experimental rig that simulation hydration as described above influences rock strength, wherein the simulation hydration
On rock strength influence experimental rig further include：Pedestal, the rock core are placed on the base；Two bearing seats, connection
Side and it is located at the opposite sides of the rock core on the base, two second driving devices are separately mounted to described in two
On bearing seat；Support base is connected to above two bearing seats, and is had above the rock core, on the support base and supplied
The opening that the pressurization disk passes through；Cylinder is connected to above the support base, the cylinder and the open communication, described to add
Platen is located in the cylinder, and the first driving means are connected on the cylinder, and the first driving means are by stretching into
It is connect with the pressurization disk in the cylinder.
The experimental rig that simulation hydration as described above influences rock strength, wherein the liquid reserve tank is connected to
Above the cylinder, the fluid injection pipeline includes hose and catheter, has runner, one end of the hose in the pressurization disk
Connect with the liquid reserve tank, the other end of the hose stretches into the cylinder, and is connect with the pressurization disk, the hose with
Runner connection, one end of the catheter is connect with the pressurization disk, and is connected to the runner, the catheter it is another
One end is stretched into the rock core.
The experimental rig that simulation hydration as described above influences rock strength, wherein the simulation hydration
Further include the heating device for heating liquid in the liquid reserve tank on the experimental rig that rock strength influences.
The experimental rig that simulation hydration as described above influences rock strength, wherein the rock core is cylinder,
The pressure plate towards the side of the rock core be semi-cylindrical.
The experimental rig that simulation hydration as described above influences rock strength, wherein connect on the fluid injection pipeline
It is connected to valve.
The experimental rig that simulation hydration as described above influences rock strength, wherein the first driving means
Including first motor and the first Worm gear feed screw elevator, the first Worm gear feed screw elevator includes being connect with the first motor
The first worm screw, the first worm gear engaged with first worm screw and be connected through a screw thread with first worm gear first
Lead screw, first lead screw is arranged along the axial direction of the rock core, and is connect with the pressurization disk；
Second driving device includes the second motor and the second Worm gear feed screw elevator, the second Worm gear feed screw lifting
Machine includes the second worm screw being connect with second motor, the second worm gear engaged with second worm screw and with described
The second lead screw that two worm gears are connected through a screw thread, second lead screw are connect with the pressure plate, and with the first lead screw phase
It is mutually vertical.
The experimental rig that simulation hydration as described above influences rock strength, wherein the first driving means
For hydraulic cylinder or linear stepping motor, second driving device is hydraulic cylinder or linear stepping motor.
The present invention also provides a kind of test methods that simulation hydration influences rock strength, use as described above
The experimental rig that simulation hydration influences rock strength, the test method include the following steps：Step S10：By rock core
It is placed between two pressure plates, and rock core is axially aligned into the pressurization disk；Step S20：Fluid injection pipeline is inserted into rock
It is intracardiac；Step S30：Start the first driving means and second driving device, when the pressurization disk contacts the rock core
End face when, the first driving means are closed, when two pressure plates are bonded with the lateral wall of the rock core, described in closing
Second driving device；Step S40：Liquid in the liquid reserve tank is heated to set temperature, by the liquid continuous note after heating
Enter in the rock core, to be impregnated to rock core；Step S50：It is again started up the first driving means and second driving
Device, so that the first driving means is applied the rock core, axis is pressed and second driving device encloses rock core application
Pressure closes the first driving means after axis pressure of application, which reaches axis, presses setting value, when the confining pressure of application reaches confining pressure setting
After value, second driving device is closed；Step S60：It keeps injecting liquid into the rock core, until when reaching setting immersion
Between after stop injection, the fluid injection pipeline is extracted out of rock core, then start the first driving means and it is described second drive
Dynamic device, makes the pressurization disk and the pressure plate be moved respectively towards the direction far from the rock core, to unload axis pressure and confining pressure,
Removal of core closes the first driving means and second driving device；Step S70：Rock core is cut, cutting is obtained
Core block carries out point load experiment, to measure the intensity of core block.
The test method that simulation hydration as described above influences rock strength, wherein the test method is also wrapped
Include following steps：Step S01：Before the step S10, the rock core is wrapped up using heat-shrink tube, then weighs the rock core
Weight, obtain rock core initial weight W1；Step S61：Before the step S70, the weight of the rock core is weighed again, is obtained
Weight W2 after being impregnated to rock core, the water absorption W3 in rock core hydration process are W2-W1.
The characteristics of experimental rig and test method that the simulation hydration of the present invention influences rock strength and advantage are：
1, the experimental rig and test method that simulation hydration of the invention influences rock strength, using axis pressure load
System and confining pressure loading system apply axis pressure and confining pressure to rock core, and persistently inject liquid into rock core and impregnated to rock core,
Influence of the hydration to rock strength under true strata pressure environment can be simulated, consequently facilitating differentiate and prediction wall strength,
Borehole wall stability and borehole collapse period；
2, the experimental rig and test method that simulation hydration of the invention influences rock strength, pass through setting heating
Liquid is heated to formation temperature by device, can simulate practical drilling process high temperature mud filtrate invasion rock, so as to truer
Influence of the hydration to rock strength under simulation ground environment.
Description of the drawings
The following drawings are only intended to schematically illustrate and explain the present invention, not delimit the scope of the invention.Wherein：
Fig. 1 is the schematic diagram for the experimental rig that the simulation hydration of the present invention influences rock strength；
Fig. 2 is the vertical view of pressure plate in Fig. 1.
Main element label declaration：
1 liquid injection system
11 liquid reserve tanks
12 fluid injection pipeline, 121 hose, 122 catheter
13 valves
2 axis press loading system
21 pressurization disk, 211 runner
22 first driving means
221 first worm screw, 222 first worm gear, 223 first lead screw
3 confining pressure loading systems
31 pressure plate, 311 semi-cylindrical, 312 big end
313 small ends
32 second driving devices
321 second worm screw, 322 second worm gear, 323 second lead screw
4 pedestals
5 bearing seats
6 support bases 61 are open
7 cylinders
100 rock core, 101 eyelet
Specific implementation mode
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control illustrates this hair
Bright specific implementation mode.Wherein, Adjective or adverbial modifier "horizontal" and "vertical", "up" and "down", use
The opposite reference being merely for convenience of between multigroup term, and and it is non-depicted to any specific direction limit through modifying term
System.
As shown in Figure 1, the present invention provides a kind of experimental rig that simulation hydration influences rock strength, or it is known as
It is a kind of to simulate experimental rig of the hydration to stratum lithological effects comprising liquid injection system 1, axis pressure loading system 2 and confining pressure
Loading system 3, liquid injection system 1 include liquid reserve tank 11 for accommodating liquid and connect and can note liquid with liquid reserve tank 11
Enter the fluid injection pipeline 12 inside rock core 100, such as the liquid in liquid reserve tank 11 is drilling fluid, preferably, connecting on fluid injection pipeline 12
It is connected to valve 13, the flowing of liquid is controlled by being turned on and off valve 13, it, can be to rock core 100 by the way that liquid injection system 1 is arranged
Inside injection liquid, simulation drilling fluid is from internal wellbore invaded formation, to simulation rock hydration；
Axis pressure loading system 2 includes the pressurization disk 21 being coaxially disposed with rock core 100 and connect and can drive with pressurization disk 21
The first driving means 22 that dynamic pressurization disk 21 is moved towards rock core 100, since pressurization disk 21 and rock core 100 are coaxially disposed, pressurization disk
21 can apply axial compressive force to rock core 100, press loading system 2 by the way that axis is arranged, can simulate rock core under true strata pressure environment
The overlying gravity of the 100 upper formation rocks born and wherein fluid；
Confining pressure loading system 3 include set on 100 both sides of rock core two pressure plates 31 and respectively with two pressure plates 31
Two the second driving devices 32 of connection, two the second driving devices 32 can respectively drive two pressure plates 31 and be transported towards rock core 100
Dynamic, two pressure plates 31 surround the periphery wall (i.e. the outer peripheral sidewall of rock core 100) of rock core 100 by make-up, and with rock core 100
Periphery wall is bonded, and to apply confining pressure to rock core 100, by the way that confining pressure loading system 3 is arranged, can be simulated from formation rock and stream
The confining pressure of body acts on.
The experimental rig of the present invention presses loading system 2 and confining pressure loading system 3 by the way that axis is arranged, can simulate true stratum
Pressure environment is applying axis pressure and while confining pressure to rock core 100, using liquid injection system 1 to injecting liquid inside rock core 100,
Influence of the hydration to rock strength under true strata pressure environment can be simulated；By changing axis pressure and confining pressure, you can simulation
Influence of the hydration to rock strength under Different Strata pressure environment.
Specifically, it is blind hole, fluid injection for simulating wellbore, eyelet 101 that 100 inside of rock core, which has eyelet 101, eyelet 101,
Pipeline 12 stretches into eyelet 101.For example, eyelet 101 is circular hole, rock core 100 is cylinder, a diameter of rock core 100 of eyelet 101
The 1/10~1/8 of diameter.
Again as shown in Figure 1, further, simulation hydration further includes pedestal 4, two on the experimental rig that rock strength influences
A bearing seat 5, support base 6 and cylinder 7, pedestal 4 are oppositely arranged with axis pressure loading system 2, and rock core 100 is placed on pedestal 4, and
Between pedestal 4 and pressurization disk 21, when pressurization disk 21 applies axis to rock core 100 presses, pedestal 4 also applies axis to rock core 100
Pressurization can be played a supporting role and be played to pressure, pedestal 4, such as pedestal 4 is plate-like structure；
Two bearing seats 5 are connected to 4 top of pedestal and are located at the opposite sides of rock core 100, two second drives
Dynamic device 32 is separately mounted on two bearing seats 5, such as bearing seat 5 is the structure that section is T-type, and bearing seat 5 includes vertical
Riser and lie in a horizontal plane in tablet at the top of riser, which can be semicircular plate, the tablet pair of two bearing seats 5
It connects to form disk, which can be integral structure, can also be split structure, such as the second driving device 32 and carrying
It is bolted between seat 5；
Support base 6 is connected to two 5 tops of bearing seat, and has for pressurization disk on 100 top of rock core, support base 6
21 openings 61 passed through, opening 61 is preferably circular open, such as support base 6 is disc-shaped structure, and the both sides of support base 6 are distinguished
It is bolted with the tablet of two bearing seats 5；
Cylinder 7 is connected to 6 top of support base, and 7 inside of cylinder is connected to opening 61, and pressurization disk 21 is located in cylinder 7, and first
Driving device 22 is connected on cylinder 7, and first driving means 22 are connect by stretching into cylinder 7 with pressurization disk 21, such as cylinder 7
For cylinder, cylinder 7 is coaxially disposed with support base 6, and the internal diameter of cylinder 7 is equal to the diameter of opening 61.
As shown in Figure 1, further, liquid reserve tank 11 is connected to 7 top of cylinder, fluid injection pipeline 12 includes hose 121 and leads
Liquid pipe 122, pressurization disk 21 is interior, and there is runner 211, runner 211 to run through pressurization disk 21, and one end and the liquid reserve tank 11 of hose 121 connect
It connects, the other end of hose 121 stretches into cylinder 7, and is connect with pressurization disk 21, and hose 121 is connected to runner 211, such as soft
Pipe 121 is connect by connector with pressurization disk 21, and the length of hose 121 is more than distance between liquid reserve tank 11 and rock core 100, with can be with
Pressurization disk 21 moves and is bent or stretches, and one end of catheter 122 is connect with pressurization disk 21, and is connected to runner 211, such as is led
Liquid pipe 122 is threadedly coupled with pressurization disk 21, and the other end of catheter 122 stretches into rock core 100, therefore the liquid in liquid reserve tank 11
It can enter in rock core 100 via hose 121, runner 211 and catheter 122.
As shown in Figure 1 and Figure 2, in a specific embodiment, rock core 100 is cylinder, and pressure plate 31 is towards rock core 100
Side be semi-cylindrical 311, the semi-cylindrical 311 of two pressure plates 31 can surround the periphery wall of rock core 100 jointly.Preferably
The internal diameter on ground, the semi-cylindrical 311 of pressure plate 31 is slightly smaller than the outer diameter of rock core 100, to ensure that two pieces of pressure plates 31 can be simultaneously
Effect applies confining pressure to rock core 100.
Further, pressure plate 31 is first side towards the side of rock core 100, and pressure plate 31 connects the second driving device 32
Side be second side, the area of first side is more than the area of second side.
Further, pressure plate 31 is wedge shaped, and the section of pressure plate 31 is trapezoidal in other words, the big end 312 of pressure plate 31
With semi-cylindrical 311, and its small end 313 is connect with the second driving device 32.But the present invention is not limited thereto, pressure plate 31
It can also be prismatic table shape, such as truncated rectangular pyramids shape, and the bottom that the area that the side towards rock core 100 of pressure plate 31 is terrace with edge is larger
The side in face, the second driving device of connection 32 of pressure plate 31 is the smaller top surface of the area of terrace with edge.
The pressure plate 31 of the present embodiment can ensure that the pressure stepless action of the second driving device 32 application in pressure plate 31
On the side contacted with rock core 100, without causing stress concentration, if pressure plate 31 is replaced with into a semicircular cylinder and one
Cylinder welded structure, the power for coming from the second driving device 32 concentrate on the contact surface of cylinder and semicircular cylinder, can cause to answer
Power is concentrated.
As shown in Figure 1, in first feasible technical solution, first driving means 22 include first motor and the first snail
Screw lift is taken turns, the first Worm gear feed screw elevator includes the first worm screw 221 being connect with first motor and the first worm screw 221
First worm gear 222 of engagement and the first lead screw 223 being connected through a screw thread with the first worm gear 222, such as the first worm gear 222
It is central axial be equipped with threaded hole, the first lead screw 223 passes through threaded hole, and the first lead screw 223 connect with pressurization disk 21, the first leading screw
223 are arranged along the axial of rock core 100, that is, along the axial direction setting of pressurization disk 21, such as the first lead screw 223 and 21 screw thread of pressurization disk
It is connected and fixed, in order to dismount.When work, first motor drives the rotation of the first worm screw 221, the first worm screw 221 to drive the first snail
222 rotation of wheel, the first worm gear 222 drive the first lead screw 223 to move along a straight line (lifting) by rotation, and the first lead screw 223 is by straight
Line movement drives pressurization disk 21 along the axial movement (moving up and down) of rock core 100；
Each second driving device includes the second motor and the second Worm gear feed screw elevator, the second Worm gear feed screw elevator packet
Include the second worm screw 321 being connect with the second motor, the second worm gear 322 engaged with the second worm screw 321 and with the second worm gear
322 the second lead screws 323 being connected through a screw thread, such as the central axial of the second worm gear 322 are equipped with threaded hole, the second lead screw 323
Across threaded hole, the second lead screw 323 is connected with corresponding pressure plate 31, and the second lead screw 323 is arranged along the radial direction of rock core 100, or
Person says that the second lead screw 323 is mutually perpendicular to the first lead screw 223, such as the second lead screw 323 is threadedly coupled fixation with pressure plate 31, with
It is easy to disassemble.When work, the second motor drives the rotation of the second worm screw 321, the second worm screw 321 to drive the rotation of the second worm gear 322, the
Two worm gears 322 drive the second lead screw 323 to move along a straight line (moving horizontally) by rotation, and the second lead screw 323 passes through the band that moves along a straight line
Dynamic the moving radially along rock core 100 of pressure plate 31.
The present embodiment applies pressure using Worm gear feed screw mechanical structure to rock core, and pressure-loaded process safety is reliable, and energy
Realize delicate pressure load, it is simple in structure, it is at low cost, it is easy to use.
In second feasible technical solution, first driving means 22 are hydraulic cylinder or linear stepping motor, and second drives
Dynamic device 32 is hydraulic cylinder or linear stepping motor.Hydraulic cylinder or linear stepping motor can drive pressurization disk 21 and pressure plate 31 straight
Line moves.
In another specific embodiment, simulation hydration further includes for adding on the experimental rig that rock strength influences
The heating device (not shown) of liquid in hot liquid reserve tank 11.The liquid in liquid reserve tank 11 is heated to set using heating device
Temperature can simulate practical drilling process high temperature drilling fluid, so as to simulate realistically shadow of the hydration to rock strength
It rings.
Further, whole composed structures of liquid injection system 1 are high temperature high-pressure resistant material, safely to be injected into rock core
Hot fluid.
The present invention also provides a kind of test methods that simulation hydration influences rock strength, use above-mentioned simulation
The experimental rig that hydration influences rock strength executes as shown in Figure 1, the test method includes the steps that next coming in order：
Step S10：Rock core 100 is placed on the position on pedestal 4 between two pressure plates 31, and rock core 100 is axial
It is directed at pressurization disk 21；
Step S20：Fluid injection pipeline 12 is inserted into inside rock core 100, preferably, fluid injection pipeline 12 is inserted into rock core 100
The middle part of interior eyelet is hereinafter, be for example inserted into the lower part of eyelet；
Step S30：Start first driving means 22 and the second driving device 32, when pressurization disk 21 contacts the end of rock core 100
When face, first driving means 22 are closed, when two pressure plates 31 are bonded with the lateral wall of rock core 100, close the second driving device
32；
Step S40：Liquid in liquid reserve tank 11 is heated to set temperature, which is formation temperature, opens valve
Door 13, by the eyelet in the liquid continuous injection rock core 100 after heating, to be impregnated to rock core 100；By to rock core
Liquid is persistently injected in 100, can be simulated drilling fluid in practical drilling process and be invaded from internal wellbore to stratum, if not continuing
Inject liquid, wait for that Liquid Penetrant enters after rock core, in eyelet liquid can reduce even without；By the way that fluid injection pipeline 12 is inserted into
Position below the middle part of eyelet in rock core 100, liquid can be backflowed from eyelet lower part to eyelet top, so as to simulate practical brill
State is circulated into drilling fluid in the process；
Step S50：First driving means 22 and the second driving device 32 are again started up, the driving of first driving means 22 is made to add
Platen 21 applies axis pressure to rock core 100 and the second driving device 32 driving pressure plate 31 applies confining pressure to rock core 100, when application
After axis pressure reaches axis pressure setting value, first driving means 22 are closed, after the confining pressure of application reaches confining pressure setting value, close second
Driving device 32；
Step S60：It keeps injecting liquid into rock core 100, until stopping injection after reaching setting soaking time, by fluid injection
Pipeline 12 is extracted out of rock core 100, is started first driving means 22 and the second driving device 32, is made pressurization disk 21 and pressure plate 31
It is moved respectively towards the direction far from rock core 100, to unload axis pressure and confining pressure, removal of core 100 closes 22 He of first driving means
Second driving device 32；It is tested, just will appreciate that in different hydrations respectively for different setting soaking times
Between lower formation rock intensity changing rule；
Step S70：Rock core 100 is cut, to 100 pieces of progress point load experiments of rock core that cutting obtains, to measure rock core 100
The intensity of block.Since 100 upper surface of rock core is inevitably impregnated by liquid, when cutting, can cut away the upper surface of rock core 100, so that examination
It is more acurrate to test result.
Further, test method of the invention is further comprising the steps of：
Step S01：Before step S10, rock core 100 is fabricated to Standard rock sample according to testing requirement, and by miniature
Drill bit processes a tiny eyelet 101 for not penetrating rock core 100 along 100 axis direction of rock core, and rock core is wrapped up using heat-shrink tube
100, the weight of rock core 100 is then weighed, 100 initial weight W1 of rock core is obtained；Rock core 100 is wrapped up by using heat-shrink tube, both
Rock core 100 can be prevented loose shapeless after pressurization or immersion, and can make the maximum stepless action of confining pressure in package face
100 outside wall surface of rock core on；
Step S61：Before step S70 and the step S60 and then it is secondary weigh rock core 100 weight, obtain rock core
Weight W2 after immersion, the water absorption W3 in rock core hydration process are W2-W1.
The present invention test method simple, intuitive, true strata pressure system environment can be simulated, setting confining pressure with
Under the conditions of axis pressure carry out mud soak experiment, then by point load experimental facilities can measure rock core under the conditions of true stratum,
Intensive parameter changing rule when the different hydration times.
The present invention applies the standard core sample after axis drilling processing using axis pressure loading system and confining pressure loading system
Add axis pressure and confining pressure, to the hole intraocular injection heating of rock core to the drilling fluid of formation temperature while pressurization, and keeps drilling well
Liquid persistently injects, and after pressurization is dipped to setting time, takes block to carry out point load experiment core sample cutting, measures core block and exist
Intensive parameter under different soaking times, the present invention are more in line with drilling fluid in wellbore and invade compared with conventional core soak test
Enter truth when stratum.
Confining pressure is mechanically loaded with axis pressure in the present invention, has safety, accurate feature, energy of the present invention
It is enough to control three axis loading forces with high accuracy, true condition of formation pressure can be simulated, the rock for meeting on-site actual situations is carried out
Stone hydration process experimental study.
The foregoing is merely the schematical specific implementation modes of the present invention, are not limited to the scope of the present invention.It is any
Those skilled in the art, do not depart from the design of the present invention and under the premise of principle made by equivalent variations and modification, should all
Belong to the scope of protection of the invention.And it should be noted that each component part of the present invention is not limited in above-mentioned entirety and answers
With, each technical characteristic described in specification of the invention can select according to actual needs one individually use or select it is multinomial
Combine use, and therefore, the present invention covers other combinations related with this case inventive point and concrete application in the nature of things.
Claims (10)
1. a kind of experimental rig that simulation hydration influences rock strength, which is characterized in that the simulation hydration pair
Rock strength influence experimental rig include：
Liquid injection system includes liquid reserve tank for accommodating liquid and is connect with the liquid reserve tank and can inject liquid into rock core
Internal fluid injection pipeline；
Axis presses loading system, includes the pressurization disk being coaxially disposed with the rock core and connect and can drive with the pressurization disk
The first driving means that the pressurization disk is moved towards the rock core；
Confining pressure loading system, include set on the rock core both sides two pressure plates and connect respectively with two pressure plates
Two the second driving devices, two second driving devices can respectively drive two pressure plates and be moved towards the rock core, two
The pressure plate surrounds the periphery wall of the rock core by make-up, and is bonded with the periphery wall of the rock core.
2. the experimental rig that simulation hydration influences rock strength as described in claim 1, which is characterized in that the mould
Intending the experimental rig that hydration influences rock strength further includes：
Pedestal, the rock core are placed on the base；
Two bearing seats are connected to above the pedestal and are located at the opposite sides of the rock core, two second drivings
Device is separately mounted on two bearing seats；
Support base is connected to above two bearing seats, and is located above the rock core, has on the support base and adds for described
The opening that platen passes through；
Cylinder is connected to above the support base, and the cylinder and the open communication, the pressurization disk are located at the cylinder
Interior, the first driving means are connected on the cylinder, the first driving means by stretch into the cylinder with it is described
Pressurization disk connects.
3. the experimental rig that simulation hydration influences rock strength as claimed in claim 2, which is characterized in that the storage
Liquid case is connected to above the cylinder, and the fluid injection pipeline includes hose and catheter, has runner in the pressurization disk, described
One end of hose is connect with the liquid reserve tank, and the other end of the hose stretches into the cylinder, and is connect with the pressurization disk,
The hose is connected to the runner, and one end of the catheter is connect with the pressurization disk, and is connected to the runner, described
The other end of catheter stretches into the rock core.
4. the experimental rig that simulation hydration influences rock strength as described in claim 1, which is characterized in that the mould
Quasi- hydration is on the heating device that the experimental rig that rock strength influences further includes for heating liquid in the liquid reserve tank.
5. such as the experimental rig that Claims 1-4 any one of them simulation hydration influences rock strength, feature exists
In, the rock core is cylinder, the pressure plate towards the side of the rock core be semi-cylindrical.
6. such as the experimental rig that Claims 1-4 any one of them simulation hydration influences rock strength, feature exists
In being connected with valve on the fluid injection pipeline.
7. such as the experimental rig that Claims 1-4 any one of them simulation hydration influences rock strength, feature exists
In the first driving means include first motor and the first Worm gear feed screw elevator, the first Worm gear feed screw elevator packet
Include the first worm screw being connect with the first motor, the first worm gear engaged with first worm screw and with first snail
The first lead screw being connected through a screw thread is taken turns, first lead screw is arranged along the axial direction of the rock core, and is connect with the pressurization disk；
Second driving device includes the second motor and the second Worm gear feed screw elevator, the second Worm gear feed screw elevator packet
Include the second worm screw being connect with second motor, the second worm gear engaged with second worm screw and with second snail
The second lead screw being connected through a screw thread is taken turns, second lead screw is connect with the pressure plate, and is mutually hung down with first lead screw
Directly.
8. such as the experimental rig that Claims 1-4 any one of them simulation hydration influences rock strength, feature exists
In the first driving means are hydraulic cylinder or linear stepping motor, and second driving device is hydraulic cylinder or straight line stepping
Motor.
9. a kind of test method that simulation hydration influences rock strength, which is characterized in that the test method is using such as
The experimental rig that claim 1 to 8 any one of them simulation hydration influences rock strength, the test method include
Following steps：
Step S10：Between rock core is placed on two pressure plates, and rock core is axially aligned into the pressurization disk；
Step S20：Fluid injection pipeline is inserted into rock core；
Step S30：Start the first driving means and second driving device, when the pressurization disk contacts the rock core
When end face, the first driving means are closed, when two pressure plates are bonded with the lateral wall of the rock core, close described the
Two driving devices；
Step S40：Liquid in the liquid reserve tank is heated to set temperature, by the liquid continuous injection rock core after heating
It is interior, to be impregnated to rock core；
Step S50：The first driving means and second driving device are again started up, make the first driving means to institute
It states rock core application axis pressure and second driving device applies confining pressure to the rock core, setting value is pressed when the axis pressure of application reaches axis
Afterwards, the first driving means are closed, after the confining pressure of application reaches confining pressure setting value, close second driving device；
Step S60：It keeps injecting liquid into the rock core, until stopping injection after reaching setting soaking time, by the note
Liquid pipe line is extracted out of rock core, then starts the first driving means and second driving device, make the pressurization disk and
The pressure plate is moved towards the direction far from the rock core respectively, and to unload axis pressure and confining pressure, removal of core closes described first
Driving device and second driving device；
Step S70：Rock core is cut, point load experiment is carried out to the core block that cutting obtains, to measure the intensity of core block.
10. the test method that simulation hydration influences rock strength as claimed in claim 9, which is characterized in that described
Test method is further comprising the steps of：
Step S01：Before the step S10, the rock core is wrapped up using heat-shrink tube, then weighs the weight of the rock core,
Obtain rock core initial weight W1；
Step S61：Before the step S70, the weight of the rock core is weighed again, obtains weight W2 after rock core impregnates, rock
Water absorption W3 during edema with the heart involved is W2-W1.
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