CN109187228A - A kind of indoor evaluation method of shale formation drilling fluid stabilizing borehole ability - Google Patents
A kind of indoor evaluation method of shale formation drilling fluid stabilizing borehole ability Download PDFInfo
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- CN109187228A CN109187228A CN201811165581.9A CN201811165581A CN109187228A CN 109187228 A CN109187228 A CN 109187228A CN 201811165581 A CN201811165581 A CN 201811165581A CN 109187228 A CN109187228 A CN 109187228A
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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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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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
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Abstract
The invention discloses a kind of indoor evaluation methods of shale formation drilling fluid stabilizing borehole ability, comprising the following steps: produces multiple groups square rock sample；Under the effect of different direct stress, mechanical test is carried out to obtain the first mechanical strength parameter along structural plane and vertical structure face respectively to protolith, remaining rock sample is placed in drilling fluid to be evaluated after impregnating same time, under identical direct stress effect corresponding with protolith, mechanical test is carried out to obtain the second mechanical strength parameter along structural plane and vertical structure face respectively；Judge formation damage form, calculates corresponding caving pressure increment caused by drilling fluid to be evaluated；Drilling fluid stabilizing borehole ability is determined.It realizes stand-by drilling fluid to the quantitative assessment of quasi- brill shale internal structure influence and weakening strength, and the quasi- indoor quantitative assessment for boring the variation of shale formation caving pressure, drilling fluid is formd to the prediction before drilling technical system of the attenuation of well week formation rock intensity, Weakening degree and stabilizing borehole ability.
Description
Technical field
The present invention relates to drilling fluid stabilizing borehole stratum merit rating method fields, and in particular to a kind of shale formation drilling well
The indoor evaluation method of liquid stabilizing borehole ability.
Background technique
Drilling fluid is also known as drilling mud or mud, and drilling fluid system rejection ability has oilfield prospecting developing important
Effect, especially the borehole well instability in drilling process has important influence.The quality of drilling fluid and its inorganic agent inhibition is excellent
Select one of the essential condition of drilling fluid system.Therefore, science, the operability of the inhibition evaluation method of drilling fluid system are
It is very important.According to professional standard " SYT6335-1997 shale-control agent for drilling fluid evaluation method " and " SYT 5613-
2000 mud shale physicochemical property test methods ", the indoor evaluation method of the inhibition of drilling fluid system is relatively more, for example based on rolling
The dynamic rate of recovery, linear expansion rate, still, the pulping of rich organic shale is poor, rolling rate of recovery is high, percent swelling is low, coring is complete
Be cleaved into block by outer force-disturbance is frangible after the poor, aquation of property, traditional drilling fluid based on evaluation indexes such as rolling rate of recovery, percent swellings and
Chemical agent evaluation method not can solve the evaluation problem of this kind of strata drilling liquid stabilizing borehole ability.On the other hand, it rolls back
The boreholes wall such as the drilling fluid anti-sloughings Performance Evaluating Indexes such as yield, percent swelling caving pressure, fracture pressure qualitative and with shale formation
Without direct relation between stability mechanics characterization parameter, to the weak of well week formation rock intensity after appraisal drilling liquid is gone into the well before cannot boring
The ability of change effect, Weakening degree and stabilizing borehole stratum, the uncertain big, risk of method of traditional first by rule of thumb " examination "
Height, therefore, it is necessary to create the indoor evaluation method for being suitable for shale formation drilling fluid stabilizing borehole stratum ability, to instructing drilling well
The research and development of liquid and chemical agent have great importance.
Summary of the invention
It comments a kind of in order to solve the above-mentioned technical problem interior that the present invention provides shale formation drilling fluid stabilizing borehole ability
Valence method.
The present invention is achieved through the following technical solutions:
A kind of indoor evaluation method of shale formation drilling fluid stabilizing borehole ability, comprising the following steps:
A, multiple groups shale square rock sample is produced；
B, under the effect of different direct stress, mechanical test is carried out to obtain along structural plane and vertical structure face respectively to protolith
First mechanical strength parameter, and remaining shale rock sample is respectively placed in the drilling fluid to be evaluated of identical environment by group impregnate it is identical
After time, under identical direct stress effect corresponding with protolith, to shale rock sample after immersion respectively along structural plane and vertical structure face
Mechanical test is carried out to obtain the second mechanical strength parameter；
C, judge formation damage form, brill to be evaluated is calculated according to the first mechanical strength parameter, the second mechanical strength parameter
Corresponding caving pressure increment caused by well liquid；
D, drilling fluid stabilizing borehole ability is determined.
Variation of this programme based on mechanical characteristics, realizing stand-by drilling fluid influences quasi- brill shale internal structure and intensity
The quantitative assessment of reduction, and the quasi- indoor quantitative assessment for boring the variation of shale formation caving pressure form drilling fluid to well week
The prediction before drilling technical system of the attenuation of formation rock intensity, Weakening degree and stabilizing borehole ability.The technical system
Under applicable evaluation different time effect and the effect of varying environment effect, drilling fluid changes shale formation caving pressure increment
Indoor quantitative assessment.The stratification of rich organic matter shale formation is relatively developed, and various discontinuous structural planes are widely present.Structural plane is
One of the main thoroughfare on mud filtrate invasion stratum is to lead to one of main inducing of rock mass damage, therefore, before mud soak
The structural plane strength characteristic changing rule research of shale seems necessary afterwards.The present invention uses direct shear test, by along structure
Face is tested with vertical structure face, rock matrix and structure face mechanic parameter is obtained, by mechanical strength parameter and caving pressure
Increment, which is combined, carries out quantitative assessment to drilling fluid stabilizing borehole ability.
Preferably, the first mechanical strength parameter, the second mechanical strength parameter include structural plane and rock matrix
Cohesive force, internal friction angle.
Preferably, the step C method particularly includes:
The caving pressure for calculating the caving pressure destroyed along matrix and destroying along structural plane determines destruction shape after comparison judgement
Formula is with the corresponding caving pressure increment of determination；
Calculate corresponding caving pressure increment caused by drilling fluid.
Further, the caving pressure ρ destroyed along matrixcmAre as follows:
The caving pressure ρ destroyed along structural planebmAre as follows:
If the caving pressure ρ destroyed along matrixcmLess than the caving pressure ρ destroyed along structural planebm, then stratum is broken along matrix
Bad, corresponding caving pressure increment is the caving pressure increment destroyed along matrix；If the caving pressure ρ destroyed along matrixcmGreater than edge
The caving pressure ρ that structural plane destroysbm, then stratum is destroyed along structural plane, and corresponding caving pressure increment is collapsing along structural plane
It collapses pressure increment.
Further, the calculation method of the caving pressure increment are as follows:
Wherein,
In formula, Δ ρcmFor the caving pressure increment destroyed along matrix, unit g/cm3；ΔρbmFor along the collapsing of structural plane
Pressure increment, unit g/cm3；H is well depth, unit m；co、ciThe cohesive force of shale matrix respectively after protolith and immersion,
Unit is MPa；Ko、KiThe intermediate parameters of shale matrix respectively after protolith and immersion；Respectively after protolith and immersion
The internal friction angle of shale matrix, unit are °.cbo、cbiThe cohesive force of shale structural plane, unit are respectively after protolith and immersion
MPa；Kbo、KbiThe intermediate parameters of structural plane respectively after protolith and immersion；Respectively shale knot after protolith and immersion
The internal friction angle in structure face, unit are °.
Compared with prior art, the present invention at least having the following advantages and benefits:
1, the variation of method of the invention based on the mechanical characteristics along structural plane Yu vertical structure face realizes stand-by drilling well
Liquid is influenced on quasi- brill shale internal structure and the quantitative assessment of weakening strength, and the quasi- room for boring the variation of shale formation caving pressure
Quantification evaluation, forms drilling fluid to the attenuation of well week formation rock intensity, Weakening degree and stabilizing borehole ability
Prediction before drilling technical system.
2, the present invention uses direct shear test, by being tested along structural plane and vertical structure face, obtain rock matrix and
Structure face mechanic parameter, by mechanical strength parameter and caving pressure increment combine to drilling fluid stabilizing borehole stratum ability into
Row quantitative assessment, accuracy are high.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is flow diagram of the present invention.
Fig. 2 is shearing schematic diagram of the rock sample along vertical structure face.
Fig. 3 is shearing schematic diagram of the rock sample along structural plane.
Fig. 4 is that the cohesion of the structural plane before and after mud soak rock sample is tried hard to.
Fig. 5 is the internal friction angle figure of the structural plane before and after mud soak rock sample.
Fig. 6 is that mud soak rock sample front and back is tried hard to along the cohesion of matrix.
Fig. 7 is internal friction angle figure of the mud soak rock sample front and back along matrix.
Fig. 8 is caving pressure increment graph after drilling well is impregnated.
Wherein, the appended drawing reference in Fig. 2, Fig. 3 are as follows: 1, structural plane；2, shear surface.Active force label are as follows: F1, shearing are answered
Power；F2, vertical stress；F3, shear stress；F4, vertical stress.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation for explaining only the invention, are not made
For limitation of the invention.
Embodiment 1
A kind of indoor evaluation method of shale formation drilling fluid stabilizing borehole ability as shown in Figure 1, comprising the following steps:
A, multiple groups shale square rock sample is produced；
B, under the effect of different direct stress, mechanical test is carried out to obtain along structural plane and vertical structure face respectively to protolith
First mechanical strength parameter, and remaining shale rock sample is respectively placed in the drilling fluid to be evaluated of identical environment by group impregnate it is identical
After time, under identical direct stress effect corresponding with protolith, to shale rock sample after immersion respectively along structural plane and vertical structure face
Mechanical test is carried out to obtain the second mechanical strength parameter；
C, judge formation damage form, brill to be evaluated is calculated according to the first mechanical strength parameter, the second mechanical strength parameter
Corresponding caving pressure increment caused by well liquid；
D, drilling fluid stabilizing borehole ability is determined.
Embodiment 2
Principle based on the above embodiment, the present embodiment enumerate a specific embodiment and are illustrated.
A, shale downhole samples or outcrop sample are acquired from mining site, drills through shale core, square needed for experiment is made
Sample；Shale sample is tested using transmission ultrasonic wave method, while also calculating the density of shale sample, to choose base
Rock sample similar in plinth physical parameter, the rock sample need to prepare multiple groups.
B, under the effect of different direct stress, to multiple groups rock sample respectively along structural plane and vertical structure face carry out mechanical test with
The first mechanical strength parameter is obtained, which includes the cohesive force of structural plane, rock mass internal friction angle and rock
The cohesive force of matrix, rock mass internal friction angle.Its shearing schematic diagram difference along structural plane and vertical structure face is as shown in Figure 2,3.
Direct stress, that is, normal stress.
Remaining rock sample is respectively placed in by group in the drilling fluid to be evaluated of identical environment after immersion same time, with protolith pair
Under answering identical direct stress to act on, mechanical test is carried out respectively to shale rock sample after immersion to obtain the second mechanical strength parameter.
The identical environment, that is, identical temperature, uniform pressure.The second mechanical strength parameter includes the cohesive force of structural plane, rubs in rock mass
Wipe cohesive force, the rock mass internal friction angle at angle and rock matrix.This is illustrated with 3 groups of drilling fluids.
In the research of rock mechanics, structural plane is the concept abstracted according to certain geobody, structural plane by
Certain material composition, there are surface texture featurs, tangential upper with " face " in the geometry infinitely extended in two-dimensional surface
Property often has certain thickness in normal direction.The development of Fissile Shale stratum stratification, is widely present various discontinuous structures
Face.Structural plane is considered as one of the main thoroughfare that drilling fluid immerses stratum, therefore is had very much to the research of structural plane strength characteristic
Necessity, structural plane strength characteristic can be obtained by direct shearing test.Power is carried out using direct shear strength test to the rock sample of stratification development
Test is learned, under normal load effect, effect of the rock by shear-type load reaches the maximum shear stress that can bear when destruction
The referred to as shearing strength of rock, shearing strength be rock resist failure by shear ability, be the most important mechanical characteristics of rock it
One, shearing strength can be obtained by carrying out the direct shearing test under different normal direction or direct stress effect to shear surface.
The stratification of rich organic shale is relatively developed, wherein the weak structure face developed will cause shale, there are two class caving pressures
Increment, i.e., along the caving pressure increment of matrix destruction and the caving pressure increment destroyed along structural plane.For certain shale formation
Under the conditions of, it is only possible to the presence of a kind of destruction situation.Therefore need once to be judged, compare the caving pressure that destroys along matrix with
The caving pressure destroyed along structural plane.
Calculate caving pressure increment caused by drilling fluid:
The caving pressure ρ destroyed along matrixcmAre as follows:
The caving pressure ρ destroyed along structural planebmAre as follows:
Wherein KoFor the intermediate parameters in protolith vertical structure face；KboFor the intermediate parameters of protolith structural plane；；coIt hangs down for protolith
The cohesive force of straight structural plane, unit MPa；cboFor the cohesive force of protolith structural plane, unit MPa；
According to the caving pressure ρ destroyed along matrixcm, along structural plane destroy caving pressure ρbmJudge formation damage form:
If the caving pressure ρ destroyed along matrixcmLess than the caving pressure ρ destroyed along structural planebm, then stratum is broken along matrix
Bad, corresponding caving pressure increment is the caving pressure increment destroyed along matrix；If the caving pressure ρ destroyed along matrixcmGreater than edge
The caving pressure ρ that structural plane destroysbm, then stratum is destroyed along structural plane, and corresponding caving pressure increment is collapsing along structural plane
It collapses pressure increment.
Calculate corresponding caving pressure increment:
Wherein,
In formula, Δ ρcmFor the caving pressure increment destroyed along matrix, unit g/cm3；ΔρbmFor along the collapsing of structural plane
Pressure increment, unit g/cm3；H is well depth, unit m；co、ciThe cohesive force of shale matrix respectively after protolith and immersion,
Unit is MPa；Ko、KiThe intermediate parameters of shale matrix respectively after protolith and immersion；Respectively after protolith and immersion
The internal friction angle of shale matrix, unit are °；cbo、cbiThe cohesive force of shale structural plane, unit are respectively after protolith and immersion
MPa；Kbo、KbiThe intermediate parameters of structural plane respectively after protolith and immersion；Respectively shale knot after protolith and immersion
The internal friction angle in structure face, unit are °.
Structure face mechanic parameter before and after 3 groups of mud soak rock samples is as shown in Figure 4,5, before 3 groups of mud soak rock samples
As shown in Figure 6,7 along matrix mechanics parameter afterwards, as seen from the figure, rock mechanics parameters amplitude of variation is most significant under drilling fluid 2 acts on,
Stabilizing power is worst.Rock mechanics parameters amplitude of variation is smaller under drilling fluid 1 acts on, and stability is relatively preferable.Wherein, structural plane
Mechanics parameter decline is more significant, shows that structural plane is more sensitive to fluid.Drilling well impregnate after caving pressure increment as shown in figure 8,
Drilling fluid 2 acts on lower caving pressure increment maximum, and stabilizing borehole ability is worst.Drilling fluid 1 acts on lower caving pressure increment minimum,
Stability is best.Thus provable, it can quantitatively realize that the quasi- interior for boring the variation of shale formation caving pressure is quantitative using this programme
Evaluation.
Shale formation caving pressure increment is calculated using the above method, is realized to quasi- brill shale formation caving pressure variation
Indoor quantitative assessment, rock sample caving pressure increment after mud soak is bigger, and stabilizing borehole ability is poorer；Caving pressure increment
Smaller, stabilizing borehole ability is better, to form drilling fluid to the attenuation of well week formation rock intensity, Weakening degree and steady
Determine the prediction before drilling technical system of borehole wall ability.
Front and back mechanics parameter is acted on based on drilling fluid, the combination of bond strength criterion theoretical calculation drilling fluid effect front and back rises
Come, to realize the indoor quantitative assessment that drilling fluid changes shale formation caving pressure increment, forms drilling fluid and stablize
The prediction before drilling technical system of borehole wall ability.Different time effect and not can also be studied by being formed by technical system through the invention
With the indoor quantitative assessment that under environmental effect effect, drilling fluid changes shale formation caving pressure increment.Above-described tool
Body embodiment has been further described the purpose of the present invention, technical scheme and beneficial effects, should be understood that
It is that the foregoing is merely a specific embodiment of the invention, are not intended to limit the scope of protection of the present invention, it is all in this hair
Within bright spirit and principle, any modification, equivalent substitution, improvement and etc. done should be included in protection scope of the present invention
Within.
Claims (5)
1. a kind of indoor evaluation method of shale formation drilling fluid stabilizing borehole ability, which comprises the following steps:
A, multiple groups shale square rock sample is produced；
B, under the effect of different direct stress, mechanical test is carried out to obtain first along structural plane and vertical structure face respectively to protolith
Mechanical strength parameter, and remaining shale rock sample is respectively placed in the drilling fluid to be evaluated of identical environment by group and impregnates same time
Afterwards, under identical direct stress effect corresponding with protolith, shale rock sample after immersion is carried out along structural plane and vertical structure face respectively
Mechanical test is to obtain the second mechanical strength parameter；
C, judge formation damage form, drilling fluid to be evaluated is calculated according to the first mechanical strength parameter, the second mechanical strength parameter
Caused corresponding caving pressure increment；
D, drilling fluid stabilizing borehole ability is determined.
2. a kind of indoor evaluation method of shale formation drilling fluid stabilizing borehole ability according to claim 1, feature
It is, the first mechanical strength parameter, the second mechanical strength parameter include the cohesive force of structural plane and rock matrix, interior rub
Wipe angle.
3. a kind of indoor evaluation method of shale formation drilling fluid stabilizing borehole ability according to claim 1, feature
It is, the step C method particularly includes:
The caving pressure for calculating the caving pressure destroyed along matrix and being destroyed along structural plane, after comparison judgement determining failure mode with
Determine corresponding caving pressure increment；
Calculate corresponding caving pressure increment caused by drilling fluid.
4. a kind of indoor evaluation method of shale formation drilling fluid stabilizing borehole ability according to claim 3, feature
It is,
The caving pressure ρ destroyed along matrixcmAre as follows:
The caving pressure ρ destroyed along structural planebmAre as follows:
If the caving pressure ρ destroyed along matrixcmLess than the caving pressure ρ destroyed along structural planebm, then stratum is destroyed along matrix, phase
Answering caving pressure increment is the caving pressure increment destroyed along matrix；If the caving pressure ρ destroyed along matrixcmGreater than along structural plane
The caving pressure ρ of destructionbm, then stratum is destroyed along structural plane, and corresponding caving pressure increment is the caving pressure along structural plane
Increment.
5. a kind of indoor evaluation method of shale formation drilling fluid stabilizing borehole ability according to claim 4, feature
It is,
The calculation method of the caving pressure increment are as follows:
Wherein,
In formula, Δ ρcmFor the caving pressure increment destroyed along matrix, unit g/cm3；ΔρbmFor along the caving pressure of structural plane
Increment, unit g/cm3；H is well depth, unit m；co、ciThe cohesive force of shale matrix, unit respectively after protolith and immersion
For MPa；Ko、KiThe intermediate parameters of shale matrix respectively after protolith and immersion；Respectively shale after protolith and immersion
The internal friction angle of matrix, unit are °；cbo、cbiThe cohesive force of shale structural plane, unit MPa respectively after protolith and immersion；
Kbo、KbiThe intermediate parameters of structural plane respectively after protolith and immersion；Respectively shale structural plane after protolith and immersion
Internal friction angle, unit be °.
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Cited By (9)
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| CN110243998A (en) * | 2019-04-17 | 2019-09-17 | 西南石油大学 | A kind of long-range QA system of inhibitive drilling fluid anti-sloughing agent and its application method |
| CN110761779A (en) * | 2019-10-26 | 2020-02-07 | 西南石油大学 | Method for evaluating surrounding rock crushing capability of drilling fluid consolidation well wall |
| CN111855484A (en) * | 2020-07-30 | 2020-10-30 | 西南石油大学 | Method for evaluating well wall capability of drilling fluid for stabilizing shale formation based on acoustoelectric response |
| CN111927446A (en) * | 2020-09-11 | 2020-11-13 | 西南石油大学 | Method for predicting collapse instability of well wall of hydrated shale stratum |
| CN113958315A (en) * | 2021-06-16 | 2022-01-21 | 西南石油大学 | Shale stratum collapse pressure prediction method based on self-absorption-constitutive model |
| CN115324571A (en) * | 2022-08-02 | 2022-11-11 | 西南石油大学 | Method and device for quantitatively predicting complex stratum well wall collapse based on drilling and logging information |
| CN115434699A (en) * | 2022-09-05 | 2022-12-06 | 中国矿业大学(北京) | Logging method and system based on measurement of static mechanical parameters of shale well wall |
| CN115526054A (en) * | 2022-10-08 | 2022-12-27 | 西南石油大学 | Plugging material optimization method based on shale fracture surface mechanical property change |
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| CN110243998A (en) * | 2019-04-17 | 2019-09-17 | 西南石油大学 | A kind of long-range QA system of inhibitive drilling fluid anti-sloughing agent and its application method |
| CN110761779B (en) * | 2019-10-26 | 2021-03-23 | 西南石油大学 | Method for evaluating surrounding rock crushing capability of drilling fluid consolidation well wall |
| CN110761779A (en) * | 2019-10-26 | 2020-02-07 | 西南石油大学 | Method for evaluating surrounding rock crushing capability of drilling fluid consolidation well wall |
| WO2021077938A1 (en) * | 2019-10-26 | 2021-04-29 | 西南石油大学 | Method of evaluating capability of drilling fluid to consolidate well wall and break surrounding rock |
| CN111855484B (en) * | 2020-07-30 | 2022-05-20 | 西南石油大学 | Method for evaluating drilling fluid stable shale stratum well wall capability based on acoustoelectric response |
| CN111855484A (en) * | 2020-07-30 | 2020-10-30 | 西南石油大学 | Method for evaluating well wall capability of drilling fluid for stabilizing shale formation based on acoustoelectric response |
| CN111927446A (en) * | 2020-09-11 | 2020-11-13 | 西南石油大学 | Method for predicting collapse instability of well wall of hydrated shale stratum |
| CN113958315A (en) * | 2021-06-16 | 2022-01-21 | 西南石油大学 | Shale stratum collapse pressure prediction method based on self-absorption-constitutive model |
| CN113958315B (en) * | 2021-06-16 | 2022-05-17 | 西南石油大学 | Shale stratum collapse pressure prediction method based on self-absorption-constitutive model |
| CN115324571A (en) * | 2022-08-02 | 2022-11-11 | 西南石油大学 | Method and device for quantitatively predicting complex stratum well wall collapse based on drilling and logging information |
| CN115324571B (en) * | 2022-08-02 | 2023-10-10 | 西南石油大学 | Complex stratum well wall collapse quantitative prediction method and device based on drilling and logging information |
| CN115434699A (en) * | 2022-09-05 | 2022-12-06 | 中国矿业大学(北京) | Logging method and system based on measurement of static mechanical parameters of shale well wall |
| CN115434699B (en) * | 2022-09-05 | 2023-08-29 | 中国矿业大学(北京) | Logging method and system based on measurement of shale well wall static mechanical parameters |
| CN115526054A (en) * | 2022-10-08 | 2022-12-27 | 西南石油大学 | Plugging material optimization method based on shale fracture surface mechanical property change |
| CN115526054B (en) * | 2022-10-08 | 2023-08-08 | 西南石油大学 | Plugging material optimization method based on shale fracture surface mechanical property change |
| CN116066092A (en) * | 2023-02-03 | 2023-05-05 | 西南石油大学 | Shale formation collapse pressure increment prediction method based on hardness experiment |
| CN116066092B (en) * | 2023-02-03 | 2024-04-26 | 西南石油大学 | Shale formation collapse pressure increment prediction method based on hardness experiment |
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