CN107179232A - A kind of method for evaluating shale stability - Google Patents
A kind of method for evaluating shale stability Download PDFInfo
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- CN107179232A CN107179232A CN201610131811.4A CN201610131811A CN107179232A CN 107179232 A CN107179232 A CN 107179232A CN 201610131811 A CN201610131811 A CN 201610131811A CN 107179232 A CN107179232 A CN 107179232A
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- core sample
- shale
- mud shale
- stability
- loss
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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
Abstract
Field, the estimation of stability of more particularly to a kind of nonactive mud shale and/or hard brittle shale are evaluated the present invention relates to shale stability.The method for evaluating shale stability comprises the following steps：Step A：Coring is carried out to mud shale, and is prepared as the core sample of size uniformity；Step B：Core sample after the core sample is soaked in the working solution at least two different activity that activity is distributed as between 01；Step C：The mechanical strength value of the core sample after the core sample and the immersion is obtained, and loss of strength ratio is obtained according to the mechanical strength value.
Description
Technical field
Field, more particularly to a kind of nonactive mud shale and/or hard brittle shale are evaluated the present invention relates to shale stability
Estimation of stability.
Background technology
Mud shale is influenceed by deposition, and its property varies, also, it can occur significant physical chemistry with drilling fluid
Effect.Shale stability evaluation is the base for studying mud shale physicochemical property, borehole wall stability analysis and drilling fluid system research and development
Plinth, the interaction characteristic that shale stability evaluation can inherently reflect between mud shale and working solution fluid, one
It is directly extremely to pay close attention to and fail the problem solved very well both at home and abroad.The method for estimating stability of mud shale is studied, contributes to understanding
The mechanism of mud shale borehole well instability, it helps the new caving-preventing sloughing drilling fluid system of design and carry out nonactive mud shale and/or hard crisp
The stability study of property mud shale.
The country publishes the research that is related in the technical paper of correlation, more using underground core landwaste or artificial cores as pair
As, carry out estimation of stability, including conventional shale stability experimental method such as rolling rate of recovery is tested, swell and
CST experimental methods, immersion test and water suction diffusion experiment are widely adopted；Such as《The hard fragility mud page of Liaohe Oil Field SHAHEJIE FORMATION
The research of the anti-collapse evaluation method of rock》Improved heat rolling dispersion method, mud cake strength detection method and the experiment of dynamic leak-off are proposed in one text
Method evaluates the stability of nonactive mud shale and/or hard brittle shale, and its result can be used for the performance of evaluating chemical stabilizer.
《Mud shale water sensitivity evaluation new method-than hydrophilic amount method research》One text proposes more nonactive applied to deep-well than hydrophilic amount method
Mud shale and/or hard brittle shale estimation of stability.This method utilize mud shale landwaste, determine mud shale specific surface area with
And water absorption, calculate and obtain water absorption i.e. mud shale on i.e. unit mud shale surface area than hydrophilic amount.Although two documents are equal
Show that the method proposed is applied to the nonactive mud shale of deep-well and/or hard brittle shale stability, but one of these methods most
Big drawback is to employ chip sample to be tested.And nonactive mud shale is firmly crisp, long-term geological structure is created
Unique microcosmos structure characteristic, is destroyed this structural using method described in text, is in fact difficult that effectively to assess its steady
It is qualitative.
In presently disclosed hard crisp nonactive shale stability evaluation method Patents, also have and determined using after fluid immersion
The method that the means of rock physical property change carry out estimation of stability, such as《A kind of stratiform hard brittle shale hydration characteristics
Evaluation method》(the patent No.：201510077077.3), the evaluation method comprises the following steps according to sequencing：To rock
Rear coring is described, core sample is prepared；Core sample is recovered to formation in situ pore-fluid saturation state；Determine ground
The longitudinal wave velocity and transverse wave speed of core sample, then change property of pore fluid, and determine change under the conditions of layer home state
The longitudinal wave velocity and transverse wave speed of core sample after property of pore fluid；According to core sample under the conditions of different aperture fluid properties
Longitudinal wave velocity and transverse wave speed situation of change, the aquation for evaluating the nonactive mud shale of stratiform and/or hard brittle shale is special
Property.It is capable of the aquation stability characteristic (quality) of quantitative assessment mud shale using this method.But this method is only applied to certain pore-fluid
The evaluation of petrophysical property after effect, more suitable for the performance of appraisal liquid, can not inherently reflect nonactive
The stability characteristic (quality) of mud shale and/or hard brittle shale itself.
Therefore, it is necessary to which developing a kind of can reflect hydration to the effect of the physicochemical property of mud shale itself and to mud
The method for estimating stability of shale mechanical characteristic influence.
The content of the invention
Based on the shortcoming of existing nonactive mud shale and/or hard brittle shale method for estimating stability, the invention provides one
Plant the stability that can reflect that hydration influences on the effect of the physicochemical property of mud shale itself and on mud shale mechanical characteristic
Evaluation method, the method overcome traditional shale stability evaluation method can not be reflected using the artificial cores that landwaste is suppressed
The influence of nonactive mud shale and/or hard brittle shale self structure, and nonactive mud shale and/or hard brittle shale
Evaluation of estimate generally can not reflect the deficiency of stability difference close to the good value of estimation of stability without possessing measurement otherness, realize
The evaluation of the objective shale stability of science, improve nonactive mud shale and/or hard brittle shale estimation of stability has
Effect property and applicability be very necessary and significant.
The method that the present invention evaluates shale stability comprises the following steps：Step A：Coring is carried out to mud shale, and prepared
For the core sample of size uniformity；Its size can using rock mechanics measure with standard core size as foundation, for example can beWithIn one kind；Step B：The core sample is distributed as in activity
At least two between 0-1, the core sample after being soaked in the working solution of preferably at least three kinds different activity；Step
C：The mechanical strength value of the core sample after the core sample and the immersion is obtained, and is obtained according to the mechanical strength value
Obtain loss of strength ratio.
In a specific embodiment, the step I before step A is additionally included in, at least two, preferably at least three kinds are determined
The activity of different operating liquid.
Wherein, in a specific embodiment, after to the core sample not soaked in the working solution and immersion
Core sample is carried out Rock Mechanics Test and determined, and obtains the rock mechanics intensity level of core sample.
In a specific embodiment, when the core sample after to immersion, which can not carry out rock mechanics intensity level immediately, to be determined,
Take out after the core sample after the immersion, preferably the core sample after the immersion is sealed, the sealing can letter
Singlely wrapped up or sealed with wax with preservative film, and before rock mechanics intensity level measure is carried out, remove sealing.
In a specific embodiment, the loss of strength ratio formulaRepresent, wherein, m is loss of strength
Than σcFor the mechanical strength of the core sample, its unit for example can be Mpa, σclFor the core sample after the immersion
The mechanical strength of product, its unit for example can be Mpa；σclL in subscript represents the specific work acted on the core sample
Make the species of liquid.
According to the loss of strength of mud shale ratio, reflect sensitiveness of the mud shale to different operating liquid from amechanical angle, m values are bigger,
Illustrate that working solution is more notable to the hydration of mud shale, when m values are 1, represent that mud shale completely loses structural strength, m values
Represent that mud shale is insensitive to the working solution during close to 0.
In a specific embodiment, step D is also included after the step C：According to the core sample in different activity
Working solution in the water-sensitive stability coefficient of the loss of strength that obtains than defining mud shale.
In a specific embodiment, the water-sensitive stability coefficient of mud shale formula S=(sin (arctan (k))+mw)
/ 2 represent, wherein, S is the water-sensitive stability coefficient of mud shale, and k is that the core sample is obtained in the working solution of different activity
Loss of strength than slope, mwThe loss of strength ratio obtained for the core sample in pure water.General water-sensitive stability
Coefficient is higher, and water sensitivity is stronger, and in the presence of the working solution fluid of high activity, loss of strength is further notable.
In a specific embodiment, it is further comprising the steps of between the step A and the step B：When the mud shale
During for formation rock, the mud shale is recovered to formation in situ pore-fluid saturation state.It can not also consider to apply stratum
Condition, and Indoor Natural condition is used, this can be according to choice of experimental conditions.The mud shale is set to recover to formation in situ hole
Saturated with fluid state can be realized by saturation instrument.
In a specific embodiment, soak time >=12 hour of the core sample in the working solution, it is preferably >=18 small
When, more preferably >=24 hour.
In a specific embodiment, in immersion process, selected as needed in the working solution by the core sample
Cover press strip part and temperature in the stratum for simulating the mud shale.General down-hole formation rock sample suggestion is grasped by this condition
Make, because so more meeting ground environment condition, truly reflect rock characteristic；If it is not enough to simulate temperature and pressure experimental condition, or is
Appear rock sample, then suitably give up.
In a specific embodiment, the working solution in pure water, water-base drilling fluid and oil base drilling fluid at least two
Or three kinds.
In a specific embodiment, the mud shale is nonactive mud shale and/or hard brittle shale.
Beneficial effect：
The mud shale of offer is invented, particularly nonactive mud shale and/or hard brittle shale (do not contain montmorillonite etc. swollen
The mud shale of swollen property clay mineral) the new method of estimation of stability considered physics and chemistry of the hydration to mud shale itself
The effect of characteristic and the influence to mud shale mechanical characteristic, by by work of the core sample of standard mud shale from different activity
Had an effect as liquid, using Rock Mechanics Test device monitoring its effect after mechanical strength index, obtain working solution activity with
The orderly monitoring result of the mechanical index of mud shale, while the stabilization that the mechanical index based on working solution activity and mud shale is set up
Property predictor formula, can specify the stability of such mud shale, be particularly suitable for nonactive mud shale and/or hard brittle shale
Estimation of stability.
Brief description of the drawings
Fig. 1 is the method flow diagram of the preferred embodiment of the present invention.
Embodiment
With reference to preferred embodiment, the invention will be further described, but protection scope of the present invention be not limited to it is following
Embodiment.
Embodiment 1
The present invention provides a kind of new method of nonactive mud shale and/or hard brittle shale estimation of stability, and it includes following step
Rapid composition ((referring to shown in accompanying drawing 1).
Step 1：Selection somewhere Penglaizhen Formation group, sandy soil stabilizer, Xu jiahe and Longma small stream group stratum appear rock sample to test
Object, to appearing, rock sample carries out coring, and is prepared into the standard core sample of size uniformity, and size isOften
Set stratum takes 8 pieces of standard core samples, 32 pieces altogether；
Step 2：Because the present embodiment uses mud shale sample of appearing, thus do not consider to apply stratum saturation state condition,
And use Indoor Natural condition；
Step 3：Three kinds of working solution fluids of selection carry out activity measurement using electric hygrometer mensuration, wherein, the activity of pure water
For 1, the polysulfonate water-based drilling fluid (sulfonated phenolic of+0.3% polyacrylic acid potassium of 3.0% bentonite+0.2% caustic soda of+0.1% soda ash+3%
The hydrolyzed polyacrylonitrile ammonium salt of+1% polyamine of resin (dry powder)+2% unstressed configuration albino bitumen of+3% sulfonated lignite+1%) activity be
0.85, low viscous height cuts the oil base drilling fluid (calcium naphthenate+20%CaCl of+2% organoclay of 0# diesel oil+3%2+ 2%CaO+3% is rotten
Grow the sour nano silicon of the alkyl benzene calcium sulfonate of quaternary ammonium salt+0.8%+2%) activity be 0.74.Mud of appearing is obtained by measurement
Shale formation water activity 0.5；
Step 4：Four sets of stratum core samples are soaked in above-mentioned three types working solution fluid respectively under normal temperature and pressure conditionses
In 24 hours；
Step 5：Core sample after being soaked to the core sample (i.e. protolith) not soaked by working solution and by working solution is opened
Open up Rock Mechanics Test to determine, obtain rock mechanics intensity level (being completed using general rock mechanics triaxial stress instrument).Its
In, when the core sample after to immersion, which can not carry out rock mechanics intensity level immediately, to be determined, take out the core after the immersion
After sample, preferably the core sample after the immersion is sealed, the sealing simply can be wrapped up or used with preservative film
Wax is sealed, and before rock mechanics intensity level measure is carried out, the preservative film or seal with wax is removed.Intensity results are shown in Table 1.
Wherein, protolith is the core sample not soaked by any liquid.
Step 6：The data of the activity of foregoing acquisition and intensity are substituted into formula respectivelyIt is middle to calculate to obtain
Stability coefficient, realizes the estimation of stability of hard brittle shale and/or nonactive mud shale.Wherein, m is loss of strength ratio,
σcFor the mechanical strength of protolith, unit is Mpa；σclAfter being soaked for core sample in a certain specific working solution fluid
Mechanical strength, unit is Mpa；L represents the species of the specific working solution acted on core sample.Damaged according to mud shale intensity
Ratio is lost, reflects sensitiveness of the mud shale to different systems from amechanical angle, m is bigger, illustrates working solution fluid to mud shale
Hydration is more notable, when m is 1, represents that mud shale completely loses structural strength, represents mud shale to the body when m is close to 0
It is insensitive.
Rock mechanics intensity measurements (the unit of table 1：MPa)
The obtained loss of strength ratio on each set stratum is calculated according to above-mentioned formula and is shown in Table 2, wherein, result of calculation be 15MPa and
Average under 30MPa confined pressures, loss of strength illustrates that the loss of strength under the working solution is more serious, water sensitivity is got over than higher
It is prominent.
Result is compared in the loss of strength of table 2
Secondly according to formula S=(sin (arctan (k))+mw)/2 calculate the water-sensitive stability coefficient for obtaining each set stratum, its
In, S is the water-sensitive stability coefficient of mud shale, and k is that the intensity that the core sample is obtained in the working solution of different activity is damaged
Lose the slope of ratio, mwThe loss of strength ratio obtained for the core sample in pure water.The water-sensitive stability coefficient knot of the present invention
Fruit is shown in Table 3.
The general steady qualitative coefficient of water-sensitive is higher, i.e., water sensitivity is stronger, and under the effect of high activity, loss of strength is further notable, respectively
The rock sample water-sensitive stability coefficient highest on Xu jiahe stratum in stratum is covered, the stability on the set stratum is worst, actual well drilled mistake
Complex situations in journey are also most, and evaluation result is reliable；The water-sensitive stability coefficient is utilized simultaneously, can also estimate different work
The intensity of formation rock after the working solution immersion of degree, and then can also predict that the intensity on stratum changes, so that it is steady to carry out the borehole wall
Qualitative analysis.
The water-sensitive stability coefficient result of table 3
Claims (9)
1. a kind of method for evaluating shale stability, it comprises the following steps：
Step A：Coring is carried out to mud shale, and is prepared as the core sample of size uniformity；
Step B：By the core sample between activity is distributed as 0-1 at least two, preferably at least three kinds different activity
Core sample after being soaked in working solution；
Step C：The mechanical strength value of the core sample after the core sample and the immersion is obtained, and according to the mechanics
Intensity level obtains loss of strength ratio.
2. according to the method described in claim 1, it is characterised in that the loss of strength ratio formulaRepresent,
Wherein, m is loss of strength ratio, σcFor the mechanical strength of the core sample, σclFor the core sample after the immersion
Mechanical strength.
3. method according to claim 1 or 2, it is characterised in that also include step D after the step C：
The loss of strength obtained according to the core sample in the working solution of different activity is more stable than the water-sensitive for defining mud shale
Property coefficient.
4. method according to claim 3, it is characterised in that the water-sensitive stability coefficient of the mud shale with formula S=
(sin(arctan(k))+mwThe expression of)/2, wherein, S is the water-sensitive stability coefficient of mud shale, and k is the core sample
The loss of strength obtained in the working solution of different activity than slope, mwThe intensity obtained for the core sample in pure water
Loss ratio.
5. the method according to any one in claim 1-4, it is characterised in that in the step A and the step B
Between it is further comprising the steps of：When the mud shale is formation rock, the mud shale is recovered to formation in situ hole stream
Body saturation state.
6. the method according to any one in claim 1-5, it is characterised in that the size of the core sample isWithIn one kind.
7. the method according to any one in claim 1-6, it is characterised in that the core sample is in the work
Soak time >=12 hour in liquid, preferably >=18 hour, more preferably >=24 hour.
8. the method according to any one in claim 1-7, it is characterised in that the working solution is selected from pure water, water
At least two in base drilling fluid and oil base drilling fluid or three kind.
9. the method according to any one in claim 1-8, it is characterised in that the mud shale is nonactive mud page
Rock and/or hard brittle shale.
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| CN108106938A (en) * | 2017-12-21 | 2018-06-01 | 西南石油大学 | It is a kind of to test the method for determining that acid solution influences dense carbonate Young's modulus |
| CN109115628A (en) * | 2018-07-27 | 2019-01-01 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | A kind of method for estimating stability of drilling fluid to rock stratum |
| CN109115625A (en) * | 2018-10-08 | 2019-01-01 | 西南石油大学 | A kind of shale hydration dynamic changes of strength variation test new equipment |
| CN109236285A (en) * | 2018-09-30 | 2019-01-18 | 西南石油大学 | Individual well undisturbed formation mechanics section calculation method, system, equipment and storage medium |
| CN109900568A (en) * | 2017-12-08 | 2019-06-18 | 中国石油化工股份有限公司 | The evaluation method of shale strength reduction degree in a kind of shale borehole well instability research |
| CN110146534A (en) * | 2019-06-03 | 2019-08-20 | 中国石油大学(华东) | Sandstone acid rock reaction effect visualizes quantitative evaluation method |
| CN112255159A (en) * | 2020-10-10 | 2021-01-22 | 西南石油大学 | Comprehensive evaluation method for hydration capacity of heterogeneous shale reservoir |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109900568A (en) * | 2017-12-08 | 2019-06-18 | 中国石油化工股份有限公司 | The evaluation method of shale strength reduction degree in a kind of shale borehole well instability research |
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| CN109115628A (en) * | 2018-07-27 | 2019-01-01 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | A kind of method for estimating stability of drilling fluid to rock stratum |
| CN109236285A (en) * | 2018-09-30 | 2019-01-18 | 西南石油大学 | Individual well undisturbed formation mechanics section calculation method, system, equipment and storage medium |
| CN109236285B (en) * | 2018-09-30 | 2022-02-18 | 西南石油大学 | Single-well undisturbed stratum mechanical profile calculation method and system |
| CN109115625A (en) * | 2018-10-08 | 2019-01-01 | 西南石油大学 | A kind of shale hydration dynamic changes of strength variation test new equipment |
| CN110146534A (en) * | 2019-06-03 | 2019-08-20 | 中国石油大学(华东) | Sandstone acid rock reaction effect visualizes quantitative evaluation method |
| CN112255159A (en) * | 2020-10-10 | 2021-01-22 | 西南石油大学 | Comprehensive evaluation method for hydration capacity of heterogeneous shale reservoir |
| CN112255159B (en) * | 2020-10-10 | 2021-08-10 | 西南石油大学 | Comprehensive evaluation method for hydration capacity of heterogeneous shale reservoir |
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