CN106768580A - A kind of horizontal stress measuring method and device - Google Patents
A kind of horizontal stress measuring method and device Download PDFInfo
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Abstract
The invention provides a kind of horizontal stress measuring method and device, including：Measure the anelasticity recovery strain value of multiple monitoring positions on cylindric core curved surface to be measured, and the drilling parameter for obtaining drilling well where core to be measured；Determine the proportionate relationship between anelasticity recovery strain value and the horizontal strain component of core to be measured；According to anelasticity recovery strain value and proportionate relationship, the horizontal maximum strain value and horizontal minimum strain value of core to be measured are determined；According to horizontal maximum strain value and horizontal minimum strain value, the horizontal maximum stress value of core to be measured and the ratio of horizontal minimum stress value are determined；According to mud pressure, pore pressure, rock mechanics parameters, core to be measured in rock the vertical stress of residing depth and above-mentioned ratio, determine the scope of horizontal stress.In the present invention, the strain value and drilling parameter of the core to be measured according to measurement measure the scope of horizontal stress, can measure the horizontal stress of mud shale, and measuring method is simple.
Description
Technical field
The present invention relates to unconventionaloil pool development technique field, in particular to a kind of horizontal stress measuring method and
Device.
Background technology
Unconventionaloil pool development technique is the maximum energy technology revolution in the whole world nearly ten years, with horizontal well multistage fracturing and
" well factory mode " has promoted the successful exploitation of global shale oil gas for the shale oil-gas exploration development technique of core.In shale oil
In gas fracturing developing, the scope of horizontal stress is one of important parameter in the exploitation of the unconventionaloil pools such as shale gas, therefore, measurement
The scope of horizontal stress is just particularly important.Wherein, the scope of the scope of above-mentioned horizontal stress including horizontal maximum stress and
The scope of horizontal minimum stress.
In the prior art, when the measurement of horizontal stress is carried out, mostly it is the scope of the horizontal minimum stress of first measurement, then leads to
Engineering parameter when there is shaft lining breakage is crossed, such as temperature difference information of mud pressure, shaft bottom mud and rock determines level
The scope of maximum stress.
The scope of horizontal minimum stress of the prior art is obtained, it is necessary to be applied in pressure break by hydraulic fracture operating curve
Man-hour could complete, but, pressing crack construction high cost and long in time limit, and most drilling wells can not carry out pressing crack construction, therefore, meeting
Lead to not the scope of the horizontal minimum stress of acquisition, and then the scope of horizontal maximum stress cannot be determined, ultimately resulting in cannot
Measurement horizontal stress.
The content of the invention
In view of this, the purpose of the embodiment of the present invention is to provide a kind of horizontal stress measuring method and device, to solve
The scope of the horizontal minimum stress of mud shale cannot be obtained sometimes by pressing crack construction in the prior art, so as to lead to not determine
Go out the scope of horizontal maximum stress, ultimately result in the problem that cannot measure horizontal stress.
In a first aspect, a kind of horizontal stress measuring method is the embodiment of the invention provides, wherein, the method includes：
The anelasticity recovery strain value of multiple monitoring positions on cylindric core curved surface to be measured is measured, and obtains described
The drilling parameter of drilling well where core to be measured, the drilling parameter includes mud pressure, pore pressure and rock mechanics parameters；
Determine the proportionate relationship between the horizontal strain component of the anelasticity recovery strain value and the core to be measured；
According to the anelasticity recovery strain value and the proportionate relationship, determine that the level of the core to be measured is maximum and answer
Variate and horizontal minimum strain value；
According to the horizontal maximum strain value and the horizontal minimum strain value, the level of the core to be measured is determined most
The ratio of big stress value and horizontal minimum stress value；
According to the mud pressure, the pore pressure, the rock mechanics parameters, the core to be measured in rock
The vertical stress of residing depth and the ratio, determine the scope of the horizontal stress of the core to be measured.
With reference in a first aspect, the embodiment of the invention provides the first possible implementation of above-mentioned first aspect, its
In, the drilling parameter also includes：Elastic modelling quantity, Poisson's ratio and thermal coefficient of expansion；
The rock mechanics parameters include the uniaxial compressive strength of rock or the uniaxial tension test of rock.
With reference to the first possible implementation of first aspect, the of above-mentioned first aspect is the embodiment of the invention provides
Two kinds of possible implementations, wherein, it is described according to the mud pressure, the pore pressure, the rock mechanics parameters, institute
The core to be measured vertical stress of residing depth and ratio in rock are stated, the horizontal stress of the core to be measured is determined
Scope, including：
According to the vertical stress and the pore pressure, the first model of the horizontal stress of the core to be measured is determined
Enclose；
According to the rock mechanics parameters, the pore pressure, the mud pressure and the ratio, determine described to be measured
Measure the second scope of the horizontal stress of core；
Determine the common factor of the first scope of the horizontal stress and the second scope of the horizontal stress；
By the scope of the horizontal stress for occuring simultaneously and being defined as the core to be measured.
With reference to second possible implementation of first aspect, the of above-mentioned first aspect is the embodiment of the invention provides
Three kinds of possible implementations, wherein, it is described according to the vertical stress and the pore pressure, determine the core to be measured
Horizontal stress the first scope, including：
According to the vertical stress and the pore pressure, the horizontal stress is determined by formula (1), (2) and (3)
First scope；
Wherein, in formula (1), formula (2) and formula (3), SVIt is the residing depth in rock of the core to be measured
The vertical stress of degree, PPIt is the pore pressure of the core to be measured, σHmaxIt is the horizontal maximum stress of the core to be measured,
σhminIt is the horizontal minimum stress of the core to be measured, μ is coefficient of friction.
With reference to second possible implementation of first aspect, the of above-mentioned first aspect is the embodiment of the invention provides
Four kinds of possible implementations, wherein, it is described according to the rock mechanics parameters, the pore pressure, the mud pressure and
The ratio, determines the second scope of the horizontal stress of the core to be measured, including：
The uniaxial compressive strength of uniaxial tension test or the rock according to the rock, determines the core to be measured
Drilling circumferential stress span；
According to the span and the ratio of the drilling circumferential stress, determined by formula (4) and formula (5) described
Second scope of the horizontal stress of core to be measured；
Wherein, in formula (4) and formula (5),It is the minimum value of the drilling circumferential stress,It is the drilling
The maximum of circumferential stress, PmIt is mud pressure, αTIt is thermal coefficient of expansion, Δ T is the temperature of drilling mud and the hole wall rock of drilling well
Degree is poor, and E is elastic modelling quantity, and ν is Poisson's ratio.
With reference in a first aspect, the embodiment of the invention provides the 5th kind of possible implementation of above-mentioned first aspect, its
In, the proportionate relationship determined between the anelasticity recovery strain value and the horizontal strain component of the core to be measured,
Including：
Using the midpoint of the bottom surface of the core to be measured as origin, using two vertical lines at excessively described midpoint as transverse axis
And the longitudinal axis, the axis using excessively described midpoint sets up coordinate system as vertical pivot；
Determine each monitoring position tangent line parallel with the bottom surface of the core to be measured relative to the coordinate system
Direction cosines horizontally and vertically；
The horizontal strain point of the anelasticity recovery strain value and the core to be measured is determined according to the direction cosines
Proportionate relationship between amount.
With reference in a first aspect, the embodiment of the invention provides the 6th kind of possible implementation of above-mentioned first aspect, its
In, it is described according to the anelasticity recovery strain value and the proportionate relationship, determine that the level of the core to be measured is maximum and answer
Variate and horizontal minimum strain value, including：
According to the anelasticity recovery strain value and the proportionate relationship that determine, the level of the core to be measured is determined
The components of strain；
According to the horizontal strain component, the horizontal maximum strain value and horizontal minimum strain of the core to be measured are determined
Value.
With reference in a first aspect, the embodiment of the invention provides the 7th kind of possible implementation of above-mentioned first aspect, its
In, it is described according to the horizontal maximum strain value and the horizontal minimum strain value, determine the level of the core to be measured most
The ratio of big stress value and horizontal minimum stress value, including：
The mean strain value of core to be measured is determined according to the horizontal maximum strain value and the horizontal minimum strain value；
According to the horizontal maximum strain value, the horizontal minimum strain value and the mean strain value, it is determined that described treat
Measure the horizontal maximum stress value of core and the ratio of horizontal minimum stress value.
With reference in a first aspect, the embodiment of the invention provides the 8th kind of possible implementation of above-mentioned first aspect, its
In, the anelasticity recovery strain value of multiple monitoring positions on the cylindric core curved surface to be measured of measurement, including：
Each described monitoring position is gathered respectively in the corresponding strain value of multiple predetermined times；
Count the number of times that each corresponding strain value in monitoring position occurs in multiple predetermined times；
Will appear from the most strain value of number of times and be defined as the corresponding anelasticity recovery strain value in the monitoring position.
Second aspect, the embodiment of the invention provides a kind of horizontal stress measurement apparatus, wherein, described device includes：
Measurement module, the anelasticity recovery strain for measuring multiple monitoring positions on cylindric core curved surface to be measured
Value；
Acquisition module, the drilling parameter for obtaining drilling well where the core to be measured, the drilling parameter includes mud
Slurry pressure, pore pressure and rock mechanics parameters；
First determining module, the horizontal strain point for determining the anelasticity recovery strain value and the core to be measured
Proportionate relationship between amount；
Second determining module, for according to the anelasticity recovery strain value and the proportionate relationship, determining described to be measured
Measure the horizontal maximum strain value and horizontal minimum strain value of core；
3rd determining module, for according to the horizontal maximum strain value and the horizontal minimum strain value, it is determined that described
The ratio of the horizontal maximum stress value of core to be measured and horizontal minimum stress value；
4th determining module, for according to the mud pressure, pore pressure, the rock mechanics parameters, described
The core to be measured vertical stress of residing depth and ratio in rock, determine the horizontal stress of the core to be measured
Scope.
Horizontal stress measuring method provided in an embodiment of the present invention and device, the strain value of the core to be measured according to measurement
And drilling parameter, the scope of horizontal stress is measured, the horizontal stress of mud shale can be measured, and measuring method is simple.
To enable the above objects, features and advantages of the present invention to become apparent, preferred embodiment cited below particularly, and coordinate
Appended accompanying drawing, is described in detail below.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be attached to what is used needed for embodiment
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, thus be not construed as it is right
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 shows the flow chart of the horizontal stress measuring method that the embodiment of the present invention 1 is provided；
Fig. 2 measures core anelasticity to be measured in showing the horizontal stress measuring method that the embodiment of the present invention 1 is provided
The flow chart of recovery strain value；
Fig. 3 shows the schematic diagram of core to be measured in the horizontal stress measuring method that the embodiment of the present invention 1 is provided；
Fig. 4 shows the stream of determination horizontal stress scope in the horizontal stress measuring method that the embodiment of the present invention 1 is provided
Cheng Tu；
Fig. 5 shows the horizontal stress curve map in the horizontal stress measuring method that the embodiment of the present invention 1 is provided；
Fig. 6 shows the structural representation of the horizontal stress measurement apparatus that the embodiment of the present invention 2 is provided.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
Middle accompanying drawing, is clearly and completely described to the technical scheme in the embodiment of the present invention, it is clear that described embodiment is only
It is a part of embodiment of the invention, rather than whole embodiments.The present invention generally described and illustrated in accompanying drawing herein is real
The component for applying example can be arranged and designed with a variety of configurations.Therefore, it is of the invention to what is provided in the accompanying drawings below
The detailed description of embodiment is not intended to limit the scope of claimed invention, but is merely representative of selected reality of the invention
Apply example.Based on embodiments of the invention, the institute that those skilled in the art are obtained on the premise of creative work is not made
There is other embodiment, belong to the scope of protection of the invention.
Mostly it is the horizontal minimum stress of first measurement when the measurement of horizontal stress scope is carried out in view of in the prior art
Scope, then by there is engineering parameter during shaft lining breakage, such as temperature difference letter of mud pressure, shaft bottom mud and rock
Breath, determines the scope of horizontal maximum stress, wherein, the scope of horizontal minimum stress is obtained by pressing crack construction, but
It is, the high cost of pressing crack construction and long in time limit, and most drilling wells can not carry out pressing crack construction, therefore, can lead to not obtain
The scope of horizontal minimum stress, and then the scope of horizontal maximum stress cannot be determined, ultimately resulting in cannot determine that level should
The scope of power.Based on this, a kind of horizontal stress measuring method and device are the embodiment of the invention provides, entered below by embodiment
Row description.
Embodiment 1
As shown in figure 1, a kind of horizontal stress measuring method is the embodiment of the invention provides, including step S110-S150, tool
Body is as follows.
S110, measures the anelasticity recovery strain value of multiple monitoring positions on cylindric core curved surface to be measured, and obtains
The drilling parameter of drilling well where core to be measured is taken, the drilling parameter includes mud pressure, pore pressure and rock mechanics parameters.
When horizontal stress is measured using method provided in an embodiment of the present invention, it is necessary to scene drills through mud shale core, and
The mud shale core for drilling through is cylinder, and the surface of the mud shale core that then will be drilled through is cleaned, and obtains core to be measured.
After mud shale core drilling is taken out, at this moment, mud shale core no longer stress, i.e., in unloading condition, the present invention
In embodiment, it is maximum to calculate the level of core to be measured that the anelasticity after measuring core off-load to be measured recovers deformation data
Ratio between stress value and horizontal minimum stress value.
The above-mentioned multiple monitoring positions set when the anelasticity recovery strain value of core to be measured is measured may be located at song
At sustained height on face, it is also possible at different height on curved surface, the embodiment of the present invention is not to above-mentioned multiple monitoring positions
The particular location put on curved surface is defined.
Above-mentioned multiple monitoring positions can be uniformly distributed on columned curved surface to be measured, i.e. each monitoring position and phase
Angle interval between adjacent monitoring position is equal, angle interval refer to the monitoring position and cylindrical center connecting line it
Between angle, such as, can be each monitoring position and its phase if setting three monitoring positions on rock core to be measured
120 ° are spaced between adjacent monitoring position.
In order to more easily calculate the horizontal stress of core to be measured, in embodiments of the present invention, adjacent monitoring position is taken
45 ° are spaced between putting.
If being spaced 45 ° between adjacent monitoring position, eight can be at most set on cylindric core curved surface to be measured
Individual monitoring position, therefore, in embodiments of the present invention, can select to set eight monitoring positions, certainly, the embodiment of the present invention is simultaneously
The number of the monitoring position to setting is not defined, as long as the number of above-mentioned monitoring position is more than or equal to 3.
Due to the anelasticity recovery strain value in horizontal direction after core off-load to be measured a period of time in can with when
Between and change, a period of time after, strain value tends towards stability, at this moment by stabilization strain value be defined as core to be measured in the direction
Anelasticity recovery strain value, as shown in Fig. 2 determining the anelasticity of multiple monitoring positions on columned core curved surface to be measured
Recovery strain value, including step S210-S230, it is specific as follows.
S210, gathers each monitoring position in the corresponding strain value of multiple predetermined times respectively；
S220, counts the number of times that each corresponding strain value in monitoring position occurs in multiple predetermined times；
S230, will appear from the most strain value of number of times and is defined as the corresponding anelasticity recovery strain value in monitoring position.
It is above-mentioned when the strain value of each monitoring position is gathered, it is necessary to keep the temperature of core to be measured constant, such energy
Enough eliminate the error that core temperature change to be measured is brought.
In embodiments of the present invention, each corresponding strain value in monitoring position in a period of time can be measured, and is measured
This should be more than the time that tend towards stability of anelastic strain value of core to be measured for a period of time, by measure this for a period of time
Section is divided into multiple moment in advance, gathers each monitoring position in the corresponding strain value of predetermined time, and starting, a period of time is interior,
Each corresponding strain value in monitoring position can be varied over, and when after a period of time, each monitoring position is corresponding
Strain value is tended towards stability, i.e., each corresponding strain value in monitoring position is no longer varied over, therefore, can be continuous many
The strain value of the monitoring position of individual predetermined time measurement is equal, i.e., the corresponding strain value in monitoring position can be multiple pre-
If the moment occurs, therefore, it can count the number of times that each corresponding strain value in monitoring position occurs in multiple predetermined times, will go out
The most strain value of occurrence number is defined as the corresponding anelasticity recovery strain value in the monitoring position, it is, occurrence number is most
Strain value be exactly the monitoring position stabilization strain value.
In embodiments of the present invention, in order to measure each corresponding strain value in monitoring position, at above-mentioned each monitoring position
Strain gauge is provided with, gathering each by strain gauge monitors position in the corresponding strain value of multiple predetermined times.
Above-mentioned strain gauge is attached at the monitoring position of core face to be measured, can be set at above-mentioned each monitoring position
One strain gauge, it is also possible to set one group of strain gauge, can include multiple strain gauges in one group of strain gauge, if, in each prison
Location is put and is respectively provided with one group of strain gauge, then the number phase of the strain gauge for including in each corresponding Strain Meter Set in monitoring position
Deng.
If setting one group of strain gauge on each monitoring position, by answering that each strain gauge in this group of strain gauge is measured
The average value of variate as the monitoring position strain value.
Wherein, above-mentioned drilling parameter also includes elastic modelling quantity, Poisson's ratio and thermal coefficient of expansion；Above-mentioned rock mechanics parameters bag
Include the uniaxial compressive strength of rock or the uniaxial tension test of rock.
Specifically, above-mentioned drilling parameter can be obtained by the method for imaging logging, that is, the image on the wall of a borehole is obtained, so
Above-mentioned drilling parameter is determined according to the wall of a borehole image afterwards.
In addition, when above-mentioned core to be measured is drilled through, it is necessary to record the depth of the core to be measured for drilling through, according to be measured
The density of the depth of core and core to be measured, can calculate the vertical stress of core to be measured.
The vertical stress of above-mentioned core to be measured refers to the gravity suffered by residing depth of the core to be measured in rock,
Vertical stress of the core to be measured in its residing depth can be calculated according to formula G=ρ gh, wherein, in the formula, G tables
Show the vertical stress of core to be measured, ρ represents the density of core to be measured, and g represents acceleration of gravity, be constant, h is to be measured
Depth of the core in drilling well.
S120, determines that the ratio between above-mentioned anelasticity recovery strain value and the horizontal strain component of core to be measured is closed
System.
Proportionate relationship between above-mentioned determination anelasticity recovery strain value and the horizontal strain component of core to be measured, specifically
Including：
Using the midpoint of the bottom surface of core to be measured as origin, to cross two vertical lines at midpoint as horizontally and vertically, with
The axis at midpoint is crossed as vertical pivot, coordinate system is set up；Determine each monitoring position tangent line parallel with the ground of core to be measured
Relative to the direction cosines horizontally and vertically of coordinate system；According to above-mentioned direction cosines determine above-mentioned anelasticity recovery strain value with
Proportionate relationship between the horizontal strain component of core to be measured.
It is above-mentioned can be using the central point of the upper bottom surface of cylindric core to be measured as origin, it is also possible to cylindric to be measured
The central point of bottom surface of core is measured as origin, it is preferred that in embodiments of the present invention, with the upper bottom surface of core to be measured
Central point is used as origin.
Specifically, the origin of the coordinate system of foundation is represented into transverse axis is represented with X with O, the longitudinal axis is represented with Y, vertical pivot Z tables
Show, set up the O-XYZ coordinate systems of core to be measured.
A strain gauge will be set with each monitoring position below, four monitoring positions will be set altogether, and adjacent each prison
Location is spaced as a example by 45 ° between putting, and the horizontal strain of above-mentioned determination anelasticity recovery strain value and core to be measured is discussed in detail
Proportionate relationship between component.
As shown in figure 3, aforementioned four monitoring position is designated as the first monitoring position a respectively1, second monitoring position a2, the 3rd prison
Location puts a3With the 4th monitoring position a4, a strain gauge, the first monitoring position a are respectively provided with each monitoring position1On two
Individual strain is calculated as C1, and the strain value that strain gauge C1 measurements are obtained is defined as into the first monitoring position a1Corresponding strain value, the
Two monitoring position a2On two strains be calculated as C3, and the strain value that strain gauge C3 measurements are obtained is defined as the second monitoring position
a2Corresponding strain value, the 3rd monitoring position a3On two strains be calculated as C2, and the strain value that strain gauge C2 measurements are obtained is true
It is set to the 3rd monitoring position a3Corresponding strain value, the 4th monitoring position a4On two strains be calculated as C4, and strain gauge C4 is surveyed
The strain value for measuring is defined as the 4th monitoring position a4Corresponding strain value.
First is calculated respectively monitors position a1, second monitoring position a2, the 3rd monitoring position a3With the 4th monitoring position a4With
Parallel direction cosines horizontally and vertically of the tangent line relative to above-mentioned coordinate system in the bottom surface of core to be measured, direction cosine refers to
Be above-mentioned tangent line respectively with the cosine value of angle horizontally and vertically, as shown in figure 3, first monitoring position a1With rock to be measured
The tangent line that the bottom surface of core is parallel is parallel with X-axis, therefore, the tangent line is 0 ° with the angle of X-axis, is 90 ° with the angle of Y-axis, thus,
The first monitoring position a can be calculated11 and 0 are respectively with the direction cosines of X-axis and Y-axis respectively, the second monitoring position a2With treat
The tangent line that the bottom surface of measurement core is parallel is parallel with Y-axis, therefore, the tangent line is 90 ° with the angle of X-axis, and the angle with Y-axis is
0 °, thus, it is possible to calculate the second monitoring position is respectively 0 and 1, the 3rd monitoring position with the direction cosines of X-axis and Y-axis respectively
a3The tangent line parallel with the bottom surface of core to be measured is 45 ° with the angle of X-axis, is 135 ° with the angle of Y-axis, thus, it is possible to count
Calculate the 3rd monitoring position a30.707 and -0.707, the 4th monitoring position a are respectively with the direction cosines of X-axis and Y-axis respectively4With
The parallel tangent line in the bottom surface of core to be measured is 135 ° with the angle of X-axis, is 45 ° with the angle of Y-axis, thus, it is possible to calculate
4th monitoring position a4- 0.707 and 0.707, above-mentioned first monitoring position a are respectively with the direction cosines of X-axis and Y-axis respectively1、
Second monitoring position a2, the 3rd monitoring position a3With the 4th monitoring position a4Respectively with the direction cosines such as institute of table 1 of X-axis and Y-axis
Show.
Table 1
In table 1, the monitoring position tangent line direction cosines l relative to X-axis parallel with the bottom surface of core to be measurediTable
Show, monitor parallel direction cosines m of the tangent line relative to Y-axis in the bottom surface of position core to be measurediRepresent, wherein, i=1,2,
3,4.When i values are 1, l1Represent that first monitors the position tangent line side relative to X-axis parallel with the bottom surface of core to be measured
To cosine, m1Represent that first monitors the position tangent line direction cosines relative to Y-axis parallel with the bottom surface of core to be measured.
When determining each monitoring position tangent line parallel with the bottom surface of core to be measured relative to X-axis and the direction of Y-axis
After cosine, according to equation below determine each corresponding strain value in monitoring position and core to be measured horizontal strain component it
Between proportionality coefficient,
The horizontal component of the corresponding anelasticity recovery strain value in monitoring position and core to be measured is determined by above-mentioned formula
Between proportionality coefficient after, obtain monitoring the proportionate relationship between the corresponding strain value in position and the horizontal component of core to be measured
For：B=A ε ', wherein, A is the above-mentioned proportionality coefficient for calculating in the formula, and b is each corresponding stagnant bullet in monitoring position
Property recovery strain value, ε ' is the horizontal strain component of core to be measured, and ε '=[ε 'x,ε′y,ε′xy]T, wherein, ε 'xFor X-axis side
To the components of strain, ε 'yIt is the components of strain of Y direction, ε 'xyIt is shearing strain.
S130, according to above-mentioned anelasticity recovery strain value and aforementioned proportion relation, determines that the level of core to be measured is maximum
Strain value and horizontal minimum strain value.
Wherein, the horizontal maximum strain value and horizontal minimum strain value of above-mentioned determination core to be measured, specifically include：
According to the anelasticity recovery strain value and aforementioned proportion relation that determine, the horizontal strain point of core to be measured is determined
Amount；According to above-mentioned horizontal strain component, the horizontal maximum strain value and horizontal minimum strain value of above-mentioned core to be measured are determined.
Specifically, it is extensive to determine that each monitors the corresponding anelasticity in position by each strain gauge monitored on position
Complex strain value, if setting a strain gauge on each monitoring position, the strain value of the stabilization that the strain gauge is gathered is true
It is set to the corresponding strain value in monitoring position, if being provided with one group of strain gauge on each monitoring position, by institute in the group
The average value for having the strain value of the stabilization of strain gauge collection is defined as the corresponding strain value in monitoring position.
The corresponding strain value b in first monitoring position1Represent, the corresponding strain value b in the second monitoring position2Represent, the 3rd
The corresponding strain value b in monitoring position3Represent, the corresponding strain value b in the 4th monitoring position4Represent, then b=[b1,b2,b3,
b4]TIt is the strain value of core to be measured.
According to the formula b=A ε ' and strain value b=[b of the core to be measured for determining1,b2,b3,b4]T, water outlet can be calculated
The flat components of strain, specific calculating process is as follows：
The transposed matrix of the proportionality coefficient between strain value and horizontal strain component is respectively multiplied by the both sides of formula b=A ε ',
I.e.：
ATA ε '=ATb
By solving above-mentioned formula, it can be deduced that ε '=(ATA)-1ATb。
Strain regime on horizontal plane can represent that the two principal strains are exactly maximum level by two principal strain values
Strain value and horizontal minimum strain value, can be with by horizontal strain component calculated level maximum strain value and horizontal minimum strain value
Obtained by solving equation below group：
Wherein, in above-mentioned formula, λ is unknown parameter to be solved, liIt is monitoring position and the bottom surface of core to be measured
Parallel tangent line relative to X-axis direction cosines, miIt is to monitor the position tangent line parallel with the bottom surface of core to be measured relative to Y
The direction cosines of axle, ε 'xIt is the components of strain of X-direction, ε 'yIt is the components of strain of Y direction, ε 'xyWith ε 'yxIt is to cut and answers
Become, and ε 'xyWith ε 'yxIt is equal in magnitude, but sign is different.
Above-mentioned equation group is system of homogeneous linear equations, coefficient ranks during the NSC of above-mentioned equation group untrivialo solution
Formula is zero, i.e.,：
To be quadratic equation with one unknown formula after above-mentioned determinantal expansion, i.e.,：
(ε′x-λ)(ε′y-λ)-ε′xyε′yx=0
By solving above-mentioned formula, two root λ on unknown parameter λ can be obtained1And λ2, by λ1And λ2In it is larger
One root is defined as the horizontal maximum strain value of core to be measured, by λ1And λ2In a less root be defined as core to be measured
Horizontal minimum strain value.
S140, according to above-mentioned horizontal maximum strain value and horizontal minimum strain value, determines that the level of core to be measured is maximum
The ratio of stress value and horizontal minimum stress value.
Specifically, the ratio of the horizontal maximum stress value of above-mentioned determination core to be measured and horizontal minimum stress value, including：
The mean strain value of core to be measured is determined according to above-mentioned horizontal maximum strain value and horizontal minimum strain value；According to above-mentioned level
Maximum strain value, horizontal minimum strain value peace strain value, determine the horizontal maximum stress value of core to be measured with level most
The ratio of small stress value.
In embodiments of the present invention, the mean strain value of core to be measured can be determined by equation below：
εIt is flat=(εmax+εmin)/2
Wherein, in above-mentioned formula, εIt is flatFor the anelasticity of core to be measured recovers mean strain value, εmaxIt is rock to be measured
The horizontal maximum strain value of core, εminIt is the horizontal minimum strain value of core to be measured.
According to horizontal strain value peace strain value, by equation below, horizontal maximum stress value and level are determined most
Small stress value；
σi=ei/Jas+em/Jav+P0
Wherein, in above-mentioned formula, the value of i is H and h, represents horizontal maximum stress value when i is H, the table when i is h
Show horizontal minimum stress value, eiRecover the difference of strain, i.e. horizontal strain value and mean strain value partially, mean strain for anelasticity
It is the average value of horizontal maximum strain value and horizontal minimum strain value to be worth, when i is H, eiFor horizontal maximum strain value with it is average
The difference of strain value, when i is h, eiIt is horizontal maximum strain value and the difference of mean strain value, emRecovering body for anelasticity should
Become, i.e., anelasticity recovers mean strain value εIt is flat, Jas is anelasticity recovery strain flexibility, and Jav is that the non-anelastic strain of volume is soft
Degree, P0It is pore pressure, σiIt is horizontal stress value.
Specifically, according to horizontal maximum strain value peace strain value, by equation below, determining the water of core to be measured
Flat maximum stress value is：
σH=(εmax-εIt is flat)/Jas+εIt is flat/Jav+P0
According to horizontal minimum strain value peace strain value, by equation below, determine that the level of core to be measured is minimum
Stress value is：
σh=(εmin-εIt is flat)/Jas+εIt is flat/Jav+P0
By above-mentioned formula, it may be determined that the ratio gone out between horizontal maximum stress value and horizontal minimum stress value is：
Because the value of JavJas is certain, the value of JasJav is 1.56 in some specific embodiments, therefore, level is most
Big ratio between stress value and horizontal minimum stress value can be defined as：
Ratio between the horizontal maximum strain value that will be had confirmed and horizontal minimum strain value substitutes into above-mentioned formula, can
To determine the ratio between horizontal maximum stress value and horizontal minimum stress value, should by horizontal maximum strain value and level minimum
Ratio between variate is designated as εmax/εmin=K, therefore, it can draw：
In above formula, P0It is known, Jav and εminKnown to being, therefore, water outlet can be determined by above-mentioned formula
Ratio between flat maximum stress value and horizontal minimum stress value.
S150, according to above-mentioned mud pressure, above-mentioned pore pressure, rock mechanics parameters, core to be measured in rock institute
Locate the vertical stress and above-mentioned ratio of depth, determine the scope of the horizontal stress of core to be measured.
Specifically, determine the scope of the horizontal stress of core to be measured, as shown in figure 4, including step S410-S440, tool
Body is as follows.
S410, according to above-mentioned vertical stress and pore pressure, determines the first scope of the horizontal stress of core to be measured；
S420, according to above-mentioned rock mechanics parameters, above-mentioned pore pressure, above-mentioned mud pressure and above-mentioned ratio, it is determined that treating
Measure the second scope of the horizontal stress of core；
S430, determines the common factor of the first scope of above-mentioned horizontal stress and the second scope of horizontal stress；
S440, above-mentioned common factor is defined as the scope of the horizontal stress of core to be measured.
In embodiments of the present invention, the pore pressure in the vertical stress and drilling parameter first according to core to be measured,
Determine a larger scope of the horizontal stress of core to be measured, i.e., the first scope of the horizontal stress of core to be measured.
Specifically, the horizontal stress of above-mentioned core to be measured includes that the horizontal maximum stress and level of core to be measured are minimum
Stress.
Determine the first scope of the horizontal stress of above-mentioned core to be measured, including：According to above-mentioned vertical stress and Pore Pressure
Power, the first scope of above-mentioned horizontal stress is determined by formula (1), (2) and (3)；
Wherein, in above-mentioned formula (1), formula (2) and formula (3), SVFor core to be measured in rock residing depth
Vertical stress, PPIt is the pore pressure of core to be measured, σHmaxIt is the horizontal maximum stress of core to be measured, σhminFor to be measured
The horizontal minimum stress of core is measured, μ is coefficient of friction.
The coefficient of friction when rock that above-mentioned friction coefficient μ refers in the earth's crust is slided, the friction coefficient μ is one
Constant, it is preferred that value 0.6.
Above-mentioned formula (1) is the span of the normal fault according to mud shale, determines that the level of core to be measured is minimum and answers
The scope of power, above-mentioned formula (2) is the span of the strike-slip fault according to mud shale, determines that the level of core to be measured is maximum
Variation relation between stress and horizontal minimum stress, above-mentioned formula (3) according to the span of the reversed fault of mud shale, it is determined that
The scope of the horizontal maximum stress along core to be measured.
To above-mentioned formula (1), (2) and (3) simultaneous solution, it may be determined that go out the model of the horizontal maximum stress of core to be measured
Enclose, the scope of the horizontal minimum stress of core to be measured, so as to obtain the first scope of horizontal stress.
Specifically, the span curve of horizontal minimum stress value can be made according to above-mentioned formula (1), first is designated as bent
Line, the span curve of horizontal maximum stress value can be made according to formula (3), be designated as the second curve, can according to formula (2)
To make change curve of the horizontal maximum stress value with horizontal minimum stress value, the 3rd curve is designated as, according to core to be measured
The value of vertical stress made the curve of the vertical stress value, was designated as the 4th curve, wherein, the 4th slope of a curve is 1, i.e.,
The abscissa and ordinate of the point on the 4th curve are equal, i.e., the horizontal minimum stress value of the point on the 4th curve and
Horizontal maximum stress value is equal, and the first scope of the horizontal stress of core to be measured can be determined according to above-mentioned four curves,
Above-mentioned four regions enclosed by a curve are exactly the first scope of the horizontal stress of core to be measured.
It is above-mentioned according to rock mechanics parameters, pore pressure, mud pressure and horizontal maximum stress value and horizontal minimum stress
The ratio of value, determines the second scope of the horizontal stress of core to be measured, specifically includes：
The uniaxial compressive strength of uniaxial tension test or rock according to above-mentioned rock, determines the drilling week of core to be measured
To the span of stress；
The span of maximum, the span of minimum value and above-mentioned ratio according to drilling circumferential stress, by public affairs
Formula (4) and formula (5) determine the second scope of the horizontal stress of above-mentioned core to be measured；
Wherein, in formula (4) and formula (5),It is the minimum value of the circumferential stress that drills,It is drilling circumferential stress
Maximum, PmIt is mud pressure, αTIt is thermal coefficient of expansion, Δ T is the temperature difference of drilling mud and the hole wall rock of drilling well, and E is
Elastic modelling quantity, ν is Poisson's ratio.
In embodiments of the present invention, can determine that the drilling of core to be measured circumferentially should according to the uniaxial tension test of rock
The span of power, it is also possible to which the uniaxial compressive strength according to rock determines the value model of the drilling circumferential stress of core to be measured
Enclose.
Specifically, there is the critical condition of hole wall destruction (including pull open bad and crush bad) according to rock, drilling is determined
The span of circumferential stress, including the maximum of drilling circumferential stress span and the minimum value of drilling circumferential stress
Span.
Specifically, above-mentioned formula (3) and formula (4) can be deformed by equation below obtaining：
Wherein, in above-mentioned formula, σθθBe drilling circumferential stress, θ be core to be measured on any one position relative to
The angle in horizontal maximum strain direction.
When θ values are 0 °, above-mentioned formula obtains minimum value, that is, drill circumferential stress σθθMinimum value is obtained, that is, is obtained
Formula (4) is stated, when θ values are 90 °, above-mentioned formula obtains maximum, that is, drill circumferential stress σθθMaximum is obtained, that is, is obtained
Above-mentioned formula (5).
Above-mentioned formula (4) is the formula of the minimum value of drilling circumferential stress, and above-mentioned formula (5) is to drill circumferential stress most
The formula of big value, specifically, when the minimum value of the circumferential stress that drills is negative value, being susceptible to hole wall and inducing tension fissure, works as brill
When the maximum of hole circumferential stress exceedes the uniaxial tension test of rock, hole wall failure by shear is susceptible to, therefore, according to drilling
The span of the minimum value of circumferential stress, the span of the maximum of drilling circumferential stress can determine above-mentioned formula
(4) and formula (5) span.
Preferably, the span of the minimum value of drilling circumferential stress is 0-20MPa, the maximum of the circumferential stress that drills
Span is 0-80.
In addition, the ratio of the above-mentioned horizontal maximum stress value for having had confirmed core to be measured and horizontal minimum stress value
Value, therefore, it can the span according to formula (4) and formula (5), and above-mentioned ratio, above three formula simultaneous equations
Group, determines the second scope of the horizontal stress of core to be measured.
Specifically, can also respectively draw above-mentioned drilling circumferential stress takes corresponding curve during different value, it is above-mentioned to be measured
The horizontal maximum stress value of core curve corresponding with the ratio of horizontal minimum stress value, the common factor of above-mentioned each bar curve is determined
The scope for going out as horizontal stress the second scope.
Due to choosing different cores to be measured, the ratio of the horizontal maximum stress value determined and horizontal minimum stress value
Value may difference, therefore, eventually determine the value of horizontal maximum stress value and the ratio of horizontal minimum stress value
Scope, the span according to the ratio determines the second scope of horizontal stress.
After the second scope of horizontal stress is determined, answered because the second scope of horizontal stress may fully fall in level
In the range of the first of power, it is also possible to partly fall in the range of the first of horizontal stress, or even, horizontal stress is not fallen within all
In the range of first, accordingly, it is determined that go out the common factor of the first scope of horizontal stress and the second scope of horizontal stress, the common factor is true
Make the scope of the horizontal stress of core to be measured.
Specifically, as shown in figure 5, being the scope of a kind of possible horizontal stress determined, in Figure 5, what is drilled through treats
The depth for measuring core is 2980m, and the vertical stress for calculating is 77.5MPa, horizontal maximum stress value and horizontal minimum stress
The span of the ratio between value is 1.02-1.10, and the span of the maximum of the circumferential stress that drills is 0-80, drilling week
It is 0-20 to the span of the minimum value of stress, the pore pressure of core to be measured is 32.1MPa, and the mud pressure of drilling well is
51.5MPa, elastic modelling quantity is 60GPa, and Poisson's ratio is 0.2, and coefficient of friction is outermost four curves besieged city in 0.6, Fig. 5
Region is the first scope of horizontal stress, and above-mentioned four articles of curves are respectively that the first curve, the second curve, the 3rd curve and the 4th are bent
Line, dash area is the second scope of horizontal stress in figure, therefore, the common factor of the first scope and the second scope is then the moon in Fig. 5
Shadow part, therefore, the scope of the horizontal stress of dash area core i.e. to be measured in the Fig. 5 for finally determining.
The measuring method of horizontal stress provided in an embodiment of the present invention, according to measurement core to be measured strain value and
Drilling parameter, measures the scope of horizontal stress, can measure the horizontal stress of mud shale, and measuring method is simple.
Embodiment 2
A kind of horizontal stress measurement apparatus are the embodiment of the invention provides, as shown in fig. 6, the device includes measurement module
610th, acquisition module 620, the first determining module 630, the second determining module 640, the 3rd determining module 650 and the 4th determining module
660；
Above-mentioned measurement module 610, the anelasticity for measuring multiple monitoring positions on cylindric core curved surface to be measured is extensive
Complex strain value；
Above-mentioned acquisition module 620, the drilling parameter for obtaining drilling well where above-mentioned core to be measured, the drilling parameter
Including mud pressure, pore pressure and rock mechanics parameters；
Above-mentioned first determining module 630, for determining that above-mentioned anelasticity recovery strain value should with the level of core to be measured
Become the proportionate relationship between component；
Above-mentioned second determining module 640, for according to above-mentioned anelasticity recovery strain value and aforementioned proportion relation, it is determined that treating
Measure the horizontal maximum strain value and horizontal minimum strain value of core；
Above-mentioned 3rd determining module 650, for according to above-mentioned horizontal maximum strain value and horizontal minimum strain value, it is determined that treating
Measure the horizontal maximum stress value of core and the ratio of horizontal minimum stress value；
Above-mentioned 4th determining module 660, for according to above-mentioned mud pressure, pore pressure, above-mentioned rock mechanics parameters, treat
Measurement the core vertical stress of residing depth and above-mentioned ratio in rock, determine the scope of the horizontal stress of core to be measured.
Horizontal stress measurement apparatus provided in an embodiment of the present invention, the strain value and brill of the core to be measured according to measurement
Well parameter, measures the scope of horizontal stress, can measure the horizontal stress of mud shale, and measuring method is simple.
The horizontal stress measurement apparatus that the embodiment of the present invention is provided can be equipment on specific hardware or be installed on
Software or firmware in equipment etc..The technique effect of the device that the embodiment of the present invention is provided, its realization principle and generation and preceding
State embodiment of the method identical, to briefly describe, device embodiment part does not refer to part, refers to phase in preceding method embodiment
Answer content.It is apparent to those skilled in the art that, for convenience and simplicity of description, system described above,
The specific work process of device and unit, may be referred to the corresponding process in above method embodiment, will not be repeated here.
In embodiment provided by the present invention, it should be understood that disclosed apparatus and method, can be by other sides
Formula is realized.Device embodiment described above is only schematical, for example, the division of the unit, only one kind are patrolled
Collect function to divide, there can be other dividing mode when actually realizing, but for example, multiple units or component can combine or can
To be integrated into another system, or some features can be ignored, or not perform.It is another, it is shown or discussed each other
Coupling or direct-coupling or communication connection can be the INDIRECT COUPLING or communication link of device or unit by some communication interfaces
Connect, can be electrical, mechanical or other forms.
The unit that is illustrated as separating component can be or may not be it is physically separate, it is aobvious as unit
The part for showing can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be according to the actual needs selected to realize the mesh of this embodiment scheme
's.
In addition, during each functional unit in the embodiment that the present invention is provided can be integrated in a processing unit, also may be used
Being that unit is individually physically present, it is also possible to which two or more units are integrated in a unit.
If the function is to realize in the form of SFU software functional unit and as independent production marketing or when using, can be with
Storage is in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words
The part contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used to so that a computer equipment (can be individual
People's computer, server, or network equipment etc.) perform all or part of step of each embodiment methods described of the invention.
And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then it need not be further defined and explained in subsequent accompanying drawing, additionally, term " the
One ", " second ", " the 3rd " etc. are only used for distinguishing description, and it is not intended that indicating or implying relative importance.
Finally it should be noted that：Embodiment described above, specific embodiment only of the invention, is used to illustrate the present invention
Technical scheme, rather than its limitations, protection scope of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, it will be understood by those within the art that：Any one skilled in the art
The invention discloses technical scope in, it can still modify to the technical scheme described in previous embodiment or can be light
Change is readily conceivable that, or equivalent is carried out to which part technical characteristic；And these modifications, change or replacement, do not make
The essence of appropriate technical solution departs from the spirit and scope of embodiment of the present invention technical scheme.Should all cover in protection of the invention
Within the scope of.Therefore, protection scope of the present invention described should be defined by scope of the claims.
Claims (10)
1. a kind of horizontal stress measuring method, it is characterised in that methods described includes：
The anelasticity recovery strain value of multiple monitoring positions on cylindric core curved surface to be measured is measured, and is obtained described to be measured
The drilling parameter of drilling well where amount core, the drilling parameter includes mud pressure, pore pressure and rock mechanics parameters；
Determine the proportionate relationship between the horizontal strain component of the anelasticity recovery strain value and the core to be measured；
According to the anelasticity recovery strain value and the proportionate relationship, the horizontal maximum strain value of the core to be measured is determined
With horizontal minimum strain value；
According to the horizontal maximum strain value and the horizontal minimum strain value, determine that the level of the core to be measured is maximum and answer
The ratio of force value and horizontal minimum stress value；
It is residing in rock according to the mud pressure, the pore pressure, the rock mechanics parameters, the core to be measured
The vertical stress of depth and the ratio, determine the scope of the horizontal stress of the core to be measured.
2. method according to claim 1, it is characterised in that the drilling parameter also includes：Elastic modelling quantity, Poisson's ratio and
Thermal coefficient of expansion；
The rock mechanics parameters include the uniaxial compressive strength of rock or the uniaxial tension test of rock.
3. method according to claim 2, it is characterised in that described according to the mud pressure, the pore pressure, institute
Rock mechanics parameters, the core to be measured vertical stress of residing depth and the ratio in rock are stated, it is determined that described treat
The scope of the horizontal stress of core is measured, including：
According to the vertical stress and the pore pressure, the first scope of the horizontal stress of the core to be measured is determined；
According to the rock mechanics parameters, the pore pressure, the mud pressure and the ratio, the rock to be measured is determined
Second scope of the horizontal stress of core；
Determine the common factor of the first scope of the horizontal stress and the second scope of the horizontal stress；
By the scope of the horizontal stress for occuring simultaneously and being defined as the core to be measured.
4. method according to claim 3, it is characterised in that described according to the vertical stress and the pore pressure,
Determine the first scope of the horizontal stress of the core to be measured, including：
According to the vertical stress and the pore pressure, the first of the horizontal stress is determined by formula (1), (2) and (3)
Scope；
Wherein, in formula (1), formula (2) and formula (3), SVFor the core to be measured in rock residing depth
Vertical stress, PPIt is the pore pressure of the core to be measured, σHmaxIt is the horizontal maximum stress of the core to be measured, σhmin
It is the horizontal minimum stress of the core to be measured, μ is coefficient of friction.
5. method according to claim 3, it is characterised in that described according to the rock mechanics parameters, the Pore Pressure
Power, the mud pressure and the ratio, determine the second scope of the horizontal stress of the core to be measured, including：
The uniaxial compressive strength of uniaxial tension test or the rock according to the rock, determines the brill of the core to be measured
The span of hole circumferential stress；
According to the span and the ratio of the drilling circumferential stress, determined by formula (4) and formula (5) described to be measured
Measure the second scope of the horizontal stress of core；
Wherein, in formula (4) and formula (5),It is the minimum value of the drilling circumferential stress,It is the drilling week
To the maximum of stress, PmIt is mud pressure, αTIt is thermal coefficient of expansion, Δ T is the temperature of drilling mud and the hole wall rock of drilling well
Difference, E is elastic modelling quantity, and ν is Poisson's ratio.
6. method according to claim 1, it is characterised in that the determination anelasticity recovery strain value is treated with described
The proportionate relationship between the horizontal strain component of core is measured, including：
Using the midpoint of the bottom surface of the core to be measured as origin, so that two vertical lines at excessively described midpoint are as transverse axis and indulge
Axle, the axis using excessively described midpoint sets up coordinate system as vertical pivot；
Determine each monitoring position tangent line horizontal stroke relative to the coordinate system parallel with the bottom surface of the core to be measured
The direction cosines of axle and the longitudinal axis；
According to the direction cosines determine the anelasticity recovery strain value and the core to be measured horizontal strain component it
Between proportionate relationship.
7. method according to claim 1, it is characterised in that described according to the anelasticity recovery strain value and the ratio
Example relation, determines the horizontal maximum strain value and horizontal minimum strain value of the core to be measured, including：
According to the anelasticity recovery strain value and the proportionate relationship that determine, the horizontal strain of the core to be measured is determined
Component；
According to the horizontal strain component, the horizontal maximum strain value and horizontal minimum strain value of the core to be measured are determined.
8. method according to claim 1, it is characterised in that described according to the horizontal maximum strain value and the level
Minimum strain value, determines the horizontal maximum stress value of the core to be measured and the ratio of horizontal minimum stress value, including：
The mean strain value of core to be measured is determined according to the horizontal maximum strain value and the horizontal minimum strain value；
According to the horizontal maximum strain value, the horizontal minimum strain value and the mean strain value, determine described to be measured
The ratio of the horizontal maximum stress value of core and horizontal minimum stress value.
9. method according to claim 1, it is characterised in that multiple prisons on the cylindric core curved surface to be measured of measurement
The anelasticity recovery strain value that location is put, including：
Each described monitoring position is gathered respectively in the corresponding strain value of multiple predetermined times；
Count the number of times that each corresponding strain value in monitoring position occurs in multiple predetermined times；
Will appear from the most strain value of number of times and be defined as the corresponding anelasticity recovery strain value in the monitoring position.
10. a kind of horizontal stress measurement apparatus, it is characterised in that described device includes：
Measurement module, the anelasticity recovery strain value for measuring multiple monitoring positions on cylindric core curved surface to be measured；
Acquisition module, the drilling parameter for obtaining drilling well where the core to be measured, the drilling parameter includes mud pressure
Power, pore pressure and rock mechanics parameters；
First determining module, for determine the anelasticity recovery strain value and the core to be measured horizontal strain component it
Between proportionate relationship；
Second determining module, for according to the anelasticity recovery strain value and the proportionate relationship, determining the rock to be measured
The horizontal maximum strain value and horizontal minimum strain value of core；
3rd determining module, for according to the horizontal maximum strain value and the horizontal minimum strain value, determining described to be measured
Measure the horizontal maximum stress value of core and the ratio of horizontal minimum stress value；
4th determining module, for according to the mud pressure, pore pressure, the rock mechanics parameters, described to be measured
Amount the core vertical stress of residing depth and ratio in rock, determine the model of the horizontal stress of the core to be measured
Enclose.
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| CN111982377A (en) * | 2020-09-01 | 2020-11-24 | 中国地质科学院地质力学研究所 | Deep hole differential stress evaluation method based on secondary sleeve core |
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