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EP2836814A1 - Method for determining geomechanical parameters of a rock sample - Google Patents

Method for determining geomechanical parameters of a rock sample

Info

Publication number
EP2836814A1
EP2836814A1 EP13719950.1A EP13719950A EP2836814A1 EP 2836814 A1 EP2836814 A1 EP 2836814A1 EP 13719950 A EP13719950 A EP 13719950A EP 2836814 A1 EP2836814 A1 EP 2836814A1
Authority
EP
European Patent Office
Prior art keywords
sample
rock
micro
parameters
during
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13719950.1A
Other languages
German (de)
French (fr)
Inventor
Kun Su
Edmond POYOL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TotalEnergies SE
Original Assignee
Total SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Total SE filed Critical Total SE
Publication of EP2836814A1 publication Critical patent/EP2836814A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G01N3/40—Investigating hardness or rebound hardness
    • G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
    • G01N3/46—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid the indentors performing a scratching movement
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
    • 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
    • G01N3/40—Investigating hardness or rebound hardness
    • G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/24—Earth materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/023—Solids
    • G01N2291/0232—Glass, ceramics, concrete or stone
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/04—Wave modes and trajectories
    • G01N2291/042—Wave modes
    • G01N2291/0421—Longitudinal waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/04—Wave modes and trajectories
    • G01N2291/042—Wave modes
    • G01N2291/0422—Shear waves, transverse waves, horizontally polarised waves

Definitions

  • the present invention relates to a method for determining geomechanical parameters of a rock sample and to a device making it possible to implement such a measurement method.
  • Some of these geomechanical parameters such as the angle of friction ( ⁇ ) or the cohesion (C) of the Mohr-Coulomb criterion which characterizes the break point of the rock, are parameters used in all the geomechanical studies at different scales, by example at the scale of a well, a reservoir, a cover or an oil field.
  • the invention thus proposes a method for determining geomechanical parameters of a rock sample, comprising:
  • the method according to the invention offers an efficient and non-destructive method for determining geomechanical parameters of the rock, including the angle of friction and cohesion.
  • the method according to the invention allows a rapid, non-destructive determination and requiring small amounts of rock sample.
  • a method according to the invention may further comprise one or more of the optional features below, considered individually or in all possible combinations:
  • the method may furthermore comprise a step of measuring the sonic parameters of the sample and in which, during the step of determining the geomechanical parameters of the sample, the Poisson's ratio of the rock is determined,
  • the sonic parameters include the propagation velocities of the compression and shear waves; the microseismic signals produced during the scratch and the micro-indentation are recorded by several sensors placed on the rock sample and on the test bench; .
  • micro-indentation measurements and / or sonic parameters are made in the stripe created during the streaking step
  • the angle of friction ( ⁇ ) and the cohesion (C) of the rock sample are determined from the interpretation of the point of inflection of the micro-indentation force-displacement curve and the streaking forces.
  • the rock sample is in the form of a core and the steps for measuring and determining the geomechanical parameters of the sample are repeated along the sample, and / or
  • the invention also relates to a computer program product comprising a series of instructions which, when loaded into a computer, causes the computer to carry out the steps of the method according to the invention.
  • the invention furthermore relates to a device for measuring the geomechanical parameters of a rock sample, the device comprising:
  • a gantry whose movement along the sample is controlled and comprising instruments of micro-indentation and scratching,
  • a computer controlling the movement of the gantry along the sample, configured to receive the data measured by the instruments fixed to the gantry and comprising calculation means making it possible, from the received data, to determine at least one parameter among the resistance to the uniaxial compression, friction angle, internal cohesion, Brinell hardness, and Young's modulus of the rock sample.
  • the gantry of the device further comprises an instrument for measuring sonic parameters of the rock sample
  • the computer of the device is configured to also receive the data measured by the measuring instrument of the samples. sonic parameters and further comprises calculating means from the received data to determine the Poisson's ratio of the rock sample.
  • FIG. 1 represents the various steps of a method according to one embodiment of the invention.
  • FIG. 2 is a schematic representation of a measuring device according to one embodiment of the invention.
  • the various elements shown in the figures are not necessarily scaled.
  • the method according to the invention comprises:
  • the method according to the invention is implemented by means of a device as represented in FIG. 2.
  • Such a device comprises:
  • test bench intended to receive a sample of rock, typically a V-shaped bench as is usually used for "scratch tests",
  • a gantry whose movement along the sample is controlled and comprising at least 18 micro-indentation and scratch test instruments and possibly an instrument for measuring the sonic parameters of the rock sample,
  • a computer 20 controlling the movement of the gantry along the sample and configured to determine from the data measured by the gantry instruments of the geomechanical parameters of the rock sample. In addition, it records the signals of microseismic emissions during measurements.
  • the horizontal and vertical forces to be provided to a blade are measured to maintain a constant forward speed and a constant cutting depth along the length of the blade. the sample to destroy a constant volume per unit length of rock at the surface of the sample.
  • the stripping step within the meaning of the invention relates to a test well known as the scratch test.
  • the forward speed of the blade can be between 5 mm / s and 25 mm / s and the depth of cut can vary from 0.05 mm to 0.5 mm depending among other types of rock analyzed.
  • the force-displacement characteristics of the sample are determined by micro-indentation.
  • the micro-indentation test is carried out by means of a cylindrical or spherical indenter having a diameter of between 0.5 and 3 mm.
  • the test can be performed with a constant or variable pitch on the surface of the stripe created during the streaking step to measure the elastic properties and the parameters of the stripe. breaking of the rock.
  • Performing the micro-indentation test by accessing the sample in the stripe created during the streaking step provides a fresh rock surface, i.e., a rock surface. whose properties are more like those of a rock not yet extracted.
  • the data collected on this fresh rock surface are therefore more relevant than those collected on a surface that has been exposed to ambient air.
  • the piston of the indenter provided with a force sensor is also fixed on the gantry.
  • the lifting and lowering of the indenter are done automatically.
  • the differential displacements of the indenter with respect to the surface of the rock are measured thanks to three sensors, for example LVDT sensors, one of which is fixed near the indenter, the two others fixed on the gantry.
  • the force and the displacement are recorded by the computer 20.
  • the measurement step is variable according to the need, for example the measurement step is between 5 to 10 cm.
  • sonic parameters of the rock sample are measured.
  • the propagation velocities of the compression waves V p and the shear stress V s are measured during the step of measuring the sonic parameters.
  • the measurements of the propagation speeds are carried out on the surface left following the scratch step and in the test intervals of the micro-indentation.
  • the sonic measurements are performed using a transmitter and a receiver placed in the streak at a distance of a predetermined distance, for example between 2 and 10 cm, in particular about 5 cm.
  • the lifting and lowering sonic sensors can be performed automatically using an arm installed on the gantry 16 and managed by the computer 20.
  • a constant pressure is imposed on the sensors to ensure good contact at the rock-sensor interface.
  • the progress step of the measurements is constant, for example equal to the predetermined distance separating the transmitter and the receiver. In particular, the advancement step may be equal to 5 cm.
  • micro-seismic emission listening is carried out using several sensors placed directly on the core and on the test bench.
  • the measured data is sent to the computer 20 which processes them to determine geomechanical parameters.
  • the elastic properties of the rock can be determined by micro-indentation, the Young's modulus (E) of the rock on a millimetric scale can be determined by analyzing the linear phase of the force-displacement curve obtained at each point of measurement. .
  • Resistance to uniaxial compression can be determined during the scratch step, using the empirical relationship between specific energy intrinsic ( ⁇ ) and the resistance Rc (compressive strength in simple compression) obtained on the samples of the same type of rock.
  • ⁇ specific energy intrinsic
  • Rc compressive strength in simple compression
  • the plastic parameters including the friction angle ( ⁇ ) and the internal cohesion (C) can be determined by the coupled interpretation of the measured data during the scratch step and the micro-indentation.
  • the friction force at the blade-rock interface as well as the force corresponding to the point of inflection of the force-displacement curve of the micro-indentation and the non-linear phase of this curve are used for the determination of these parameters.
  • the inventors propose to exploit both the specific energy ( ⁇ ) provided by the stripe; and the force (F R ) and the displacement (e R ) of the point of the linearity loss (R) of the force-displacement curve of the cylindrical indenter to determine the friction angle and cohesion of the rocks.
  • the inventors propose to exploit the micro-seismic emissions to interpret the different phases of the force-displacement curve of the micro-indentation and the impact of the depth of cut on the measurement of the specific energy of the scratch.
  • the inventors propose to measure the Brinell hardness of a rock sample with a spherical indenter by performing a charge-discharge cycle.
  • the irreversible displacement measured at the end of the discharge makes it possible to calculate the Duret Brinell index (HB).
  • the mechanical and sonic data obtained on the same surface of the core make it possible to establish with confidence correlations between the parameters. Such correlations are used for the construction of log geomechanics at the scale of a borehole.
  • the effect of grouping measurements on a single bench minimizes the dispersion of sample preparation results, and in addition provides the ability to perform a coupled interpretation of data from different measurements to obtain consistent mechanical parameters.
  • the method according to the invention is very effective in determining the parameters of rock rupture, in particular on clays because one of the great difficulties of clays is obtaining uncracked samples.
  • the method according to the invention is applicable to small samples, which offers a wide field of application in geomechanical studies (for example drilling and roofing stability) in which the parameters of the failure criterion are often unknown due to lack of suitable samples in conventional tests.
  • micro-indentation test can be performed directly on carrots.
  • cohesion values C, angle of friction ⁇ , Brinell hardness and Young's modulus E can be obtained at a constant pitch over a certain length of core.
  • a geomechanical LOG can thus be established, and it can be extrapolated to the training set using correlations with the other LOGs measured in drilling.
  • This LOG is an input data for hydraulic fracturing modeling.

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Abstract

The present invention relates to a method for determining geomechanical parameters of a rock sample, including: a scratching step, during which the horizontal and vertical forces provided to a blade advancing at a constant speed and at a constant cutting depth along the sample are measured, in order to destroy a constant volume per unit of length at the surface of the rock sample; a micro-indentation step, during which mechanical features of the rock are determined by micro-indentation; a step of determining the geological parameters of the sample, during which at least one parameter chosen from the uniaxial compressive strength, the angle of friction, internal cohesion, Brinell hardness and Young's modulus of the rock is estimated by means of measurements taken during the scratching and micro-indentation steps.

Description

Procédé de détermination de paramètres géomécaniques d' un échantillon de roche La présente invention concerne un procédé de détermination de paramètres géomécaniques d'un échantillon de roche ainsi qu'un dispositif permettant de mettre en œuvre un tel procédé de mesure.  The present invention relates to a method for determining geomechanical parameters of a rock sample and to a device making it possible to implement such a measurement method.
Lors de l'étude géomécanique d'un sous-sol, il est classiquement réalisé des carottages dans le sous-sol afin de récupérer des échantillons de roches.  During the geomechanical study of a subsoil, it is conventionally carried out in the basement to collect rock samples.
La détermination de certains paramètres géomécaniques des roches permet de mieux appréhender le comportement de la structure souterraine à une éventuelle exploitation de ce sous-sol.  The determination of certain geomechanical parameters of the rocks makes it possible to better apprehend the behavior of the underground structure to a possible exploitation of this subsoil.
Certains de ces paramètres géomécaniques comme l'angle de frottement (Φ) ou la cohésion (C) du critère de Mohr-Coulomb qui caractérise le seuil de rupture de la roche, sont des paramètres utilisés dans toutes les études géomécaniques à différente échelle, par exemple à l'échelle d'un puits, d'un réservoir, d'une couverture ou encore d'un champ pétrolier.  Some of these geomechanical parameters such as the angle of friction (Φ) or the cohesion (C) of the Mohr-Coulomb criterion which characterizes the break point of the rock, are parameters used in all the geomechanical studies at different scales, by example at the scale of a well, a reservoir, a cover or an oil field.
Habituellement, la détermination de l'angle de frottement et de la cohésion d'une roche nécessite des essais de compression triaxiale à différentes pressions de confinement .  Typically, the determination of the friction angle and cohesion of a rock requires triaxial compression testing at different confining pressures.
Bien que donnant des résultats satisfaisants ces essais de compression triaxiale sont complexes à mettre en œuvre, en particulier pour les roches argileuses, en raison des fissures induites par le forage et la conservation (déshydratation) . En outre, ces essais sont de très longues durées, au minimum une semaine par essai. Il existe donc un besoin pour une méthode de détermination de paramètres géologiques à partir d'un échantillon de roche, dont l'angle de frottement et la cohésion de la roche qui soit plus simple et rapide à mettre en œuvre que les méthodes existantes. Although yielding satisfactory results, these triaxial compression tests are complex to implement, particularly for clay rocks, because of cracks induced by drilling and preservation (dehydration). In addition, these tests are very long, at least one week per test. There is therefore a need for a method for determining geological parameters from a rock sample, which angle of friction and cohesion of the rock is easier and faster to implement than existing methods.
L' invention propose ainsi un procédé de détermination de paramètres géomécaniques d'un échantillon de roche, comprenant :  The invention thus proposes a method for determining geomechanical parameters of a rock sample, comprising:
- une étape de rayure au cours de laquelle les forces horizontales et verticales fournies à une lame avançant à vitesse constante et à une profondeur de coupe constante le long de la surface d'un échantillon sont mesurées,  a scratch step in which the horizontal and vertical forces supplied to a blade advancing at a constant speed and at a constant cutting depth along the surface of a sample are measured,
une étape de micro-indentation sur la rayure au cours de laquelle des caractéristiques mécaniques de la roche sont déterminées par micro-indentation,  a step of micro-indentation on the stripe during which mechanical characteristics of the rock are determined by micro-indentation,
une étape de détermination des paramètres géologiques de l'échantillon au cours de laquelle au moins un paramètre parmi la résistance à la compression uniaxiale, l'angle de friction, la cohésion interne, la dureté Brinell, et le module d' Young de la roche est estimé au moyen des mesures effectuées au cours des étapes de rayure et de micro-indentation.  a step of determining the geological parameters of the sample during which at least one parameter among the uniaxial compression strength, the friction angle, the internal cohesion, the Brinell hardness, and the Young's modulus of the rock is estimated by means of measurements made during the streaking and micro-indentation steps.
Avantageusement, le procédé selon l'invention offre une méthode efficace et non destructrice pour déterminer des paramètres géomécaniques de la roche, dont l'angle de frottement et la cohésion.  Advantageously, the method according to the invention offers an efficient and non-destructive method for determining geomechanical parameters of the rock, including the angle of friction and cohesion.
Avantageusement, le procédé selon l'invention permet une détermination rapide, non-destructive et nécessitant de petites quantités d'échantillon de roche.  Advantageously, the method according to the invention allows a rapid, non-destructive determination and requiring small amounts of rock sample.
En outre, le procédé selon l'invention peut être mis en œuvre de façon quasi continue.  In addition, the method according to the invention can be implemented almost continuously.
Un procédé selon l'invention peut en outre comporter une ou plusieurs des caractéristiques optionnelles ci- dessous, considérées individuellement ou selon toutes les combinaisons possibles : A method according to the invention may further comprise one or more of the optional features below, considered individually or in all possible combinations:
- le procédé peut comprendre en outre une étape de mesure des paramètres soniques de l'échantillon et dans lequel au cours de l'étape de détermination des paramètres géomécaniques de l'échantillon le coefficient de Poisson de la roche est déterminé,  the method may furthermore comprise a step of measuring the sonic parameters of the sample and in which, during the step of determining the geomechanical parameters of the sample, the Poisson's ratio of the rock is determined,
- les paramètres soniques comprennent les vitesses de propagation des ondes de compression et de cisaillement, - les signaux microsismiques produits pendant la rayure et la micro-indentation sont enregistrés par plusieurs capteurs placés sur l'échantillon de la roche et sur le banc d'essai.  the sonic parameters include the propagation velocities of the compression and shear waves; the microseismic signals produced during the scratch and the micro-indentation are recorded by several sensors placed on the rock sample and on the test bench; .
les mesures de micro-indentation et/ou des paramètres soniques sont réalisées dans la rayure créée au cours de l'étape de rayure,  the micro-indentation measurements and / or sonic parameters are made in the stripe created during the streaking step,
l'angle de frottement (Φ) et la cohésion (C) de l'échantillon de roche sont déterminés à partir de l'interprétation du point d'inflexion de la courbe force- déplacement de micro-indentation et des forces de rayure.  the angle of friction (Φ) and the cohesion (C) of the rock sample are determined from the interpretation of the point of inflection of the micro-indentation force-displacement curve and the streaking forces.
l'échantillon de roche est sous la forme d'une carotte et les étapes de mesure et de détermination des paramètres géomécaniques de l'échantillon sont répétées le long de l'échantillon, et/ou  the rock sample is in the form of a core and the steps for measuring and determining the geomechanical parameters of the sample are repeated along the sample, and / or
- l'échantillon est photographié pendant les étapes de mesure .  - the sample is photographed during the measuring steps.
L' invention se rapporte également à un produit de programme d' ordinateur comprenant une série d' instructions qui lorsque chargée dans un ordinateur entraîne l'exécution par ledit ordinateur des étapes du procédé selon 1' invention . The invention also relates to a computer program product comprising a series of instructions which, when loaded into a computer, causes the computer to carry out the steps of the method according to the invention.
L' invention se rapporte en outre à un dispositif de mesure des paramètres géomécaniques d'un échantillon de roche, le dispositif comprenant : The invention furthermore relates to a device for measuring the geomechanical parameters of a rock sample, the device comprising:
- un banc d'essai destiné à recevoir un échantillon de roche,  - a test bench intended to receive a sample of rock,
- un portique dont le mouvement le long de l'échantillon est contrôlé et comprenant des instruments de micro-indentation et de rayure,  a gantry whose movement along the sample is controlled and comprising instruments of micro-indentation and scratching,
- un ordinateur contrôlant le mouvement du portique le long de l'échantillon, configuré pour recevoir les données mesurées par les instruments fixés au portique et comprenant des moyens de calcul permettant à partir des données reçues de déterminer au moins un paramètre parmi la résistance à la compression uniaxiale, l'angle de friction, la cohésion interne, la dureté Brinell, et le module d' Young de l'échantillon de roche.  a computer controlling the movement of the gantry along the sample, configured to receive the data measured by the instruments fixed to the gantry and comprising calculation means making it possible, from the received data, to determine at least one parameter among the resistance to the uniaxial compression, friction angle, internal cohesion, Brinell hardness, and Young's modulus of the rock sample.
Selon un aspect de l'invention, le portique du dispositif comprend en outre un instrument de mesure des paramètres soniques de l'échantillon de roche, et l'ordinateur du dispositif est configuré pour recevoir également les données mesurées par l'instrument de mesure des paramètres soniques et comprend en outre des moyens de calcul permettant à partir des données reçues de déterminer le coefficient de Poisson de l'échantillon de roche.  According to one aspect of the invention, the gantry of the device further comprises an instrument for measuring sonic parameters of the rock sample, and the computer of the device is configured to also receive the data measured by the measuring instrument of the samples. sonic parameters and further comprises calculating means from the received data to determine the Poisson's ratio of the rock sample.
L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés dans lesquels :  The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the appended drawings in which:
la figure 1 représente les différentes étapes d'un procédé selon un mode de réalisation de l'invention, et  FIG. 1 represents the various steps of a method according to one embodiment of the invention, and
la figure 2 est une représentation schématique d'un dispositif de mesure selon un mode de réalisation de l' invention . Pour des raisons de clarté, les différents éléments représentés sur les figures ne sont pas nécessairement à 1' échelle . Figure 2 is a schematic representation of a measuring device according to one embodiment of the invention. For the sake of clarity, the various elements shown in the figures are not necessarily scaled.
Selon un mode de réalisation représenté à la figure 1, le procédé selon l'invention comprend :  According to an embodiment represented in FIG. 1, the method according to the invention comprises:
- une étape de rayure SI,  an SI stripe step,
- une étape de micro-indentation S2,  a micro-indentation step S2,
- une étape de mesure des paramètres soniques S3, et a step of measuring the sonic parameters S3, and
- une étape de détermination des paramètres géomécaniques de l'échantillon S4. a step of determining the geomechanical parameters of the sample S4.
De préférence, le procédé selon l'invention est mis en œuvre au moyen d'un dispositif tel que représenté à la figure 2. Preferably, the method according to the invention is implemented by means of a device as represented in FIG. 2.
Un tel dispositif comprend :  Such a device comprises:
- un banc d'essai destiné à recevoir un échantillon de roche, typiquement un banc en V comme utilisé usuellement pour des « scratch tests »,  a test bench intended to receive a sample of rock, typically a V-shaped bench as is usually used for "scratch tests",
- un portique dont le mouvement le long de l'échantillon est contrôlé et comprenant au moins des instruments 18 de micro-indentation et de scratch test et éventuellement un instrument de mesure des paramètres soniques de l'échantillon de roche,  a gantry whose movement along the sample is controlled and comprising at least 18 micro-indentation and scratch test instruments and possibly an instrument for measuring the sonic parameters of the rock sample,
- plusieurs capteurs d'écoute d'émission micro- sismiques placés sur l'échantillon et sur le banc.  - several microseismic emission monitoring sensors placed on the sample and on the bench.
- un ordinateur 20 contrôlant le mouvement du portique le long de l'échantillon et configuré pour déterminer à partir des données mesurées par les instruments du portique des paramètres géomécaniques de l'échantillon de roche. De surcroit, il enregistre les signaux des émissions micro- sismiques au cours de mesures. Au cours de l'étape de rayure SI, on mesure les forces horizontales et verticales qu'il faut fournir à une lame, par exemple une lame de cutter, pour maintenir une vitesse constante d'avancement et une profondeur de coupe constante le long de l'échantillon afin de détruire un volume constant par unité de longueur de roche à la surface de l'échantillon. a computer 20 controlling the movement of the gantry along the sample and configured to determine from the data measured by the gantry instruments of the geomechanical parameters of the rock sample. In addition, it records the signals of microseismic emissions during measurements. During the stripe step SI, the horizontal and vertical forces to be provided to a blade, for example a cutter blade, are measured to maintain a constant forward speed and a constant cutting depth along the length of the blade. the sample to destroy a constant volume per unit length of rock at the surface of the sample.
L'étape de rayure au sens de l'invention se rapporte à un test bien connu sous le nom de scratch test.  The stripping step within the meaning of the invention relates to a test well known as the scratch test.
L'interprétation de ces mesures dans le cadre d'une approche Energie/volume permet d'estimer le profil de l'énergie spécifique intrinsèque (ISE Intrinsic Spécifie Energy) le long de l'échantillon.  The interpretation of these measurements in the context of an Energy / Volume approach makes it possible to estimate the profile of the intrinsic specific energy (ISE Intrinsic Specifies Energy) along the sample.
Selon un mode de réalisation, la vitesse d'avancement de la lame peut être comprise entre 5 mm/s et 25 mm/s et la profondeur de coupe peut varier de 0,05 mm à 0,5 mm en fonction entre autre du type de roche analysée.  According to one embodiment, the forward speed of the blade can be between 5 mm / s and 25 mm / s and the depth of cut can vary from 0.05 mm to 0.5 mm depending among other types of rock analyzed.
Plusieurs passes préalables peuvent être nécessaires pour obtenir une surface plane le long de la carotte en raison des irrégularités de surface.  Several prerequisites may be required to obtain a flat surface along the core due to surface irregularities.
Les valeurs de forces de coupe à l'interface lame- roche sont enregistrées le long de l'échantillon à plusieurs profondeurs maintenues constantes tout le long de la rayure.  The values of cutting forces at the rock-knife interface are recorded along the sample at several depths held constant all along the scratch.
Au cours de l'étape de micro-indentation, on détermine par micro-indentation les caractéristiques force- déplacement de l'échantillon.  During the micro-indentation step, the force-displacement characteristics of the sample are determined by micro-indentation.
Selon un mode de réalisation, le test de micro- indentation est réalisé au moyen d'un indenteur cylindrique ou sphérique d'un diamètre compris entre 0,5 et 3 mm. Le test peut être réalisé à pas constant ou variable sur la surface de la rayure créée au cours de l'étape de rayure pour mesurer les propriétés élastiques et les paramètres de rupture de la roche. According to one embodiment, the micro-indentation test is carried out by means of a cylindrical or spherical indenter having a diameter of between 0.5 and 3 mm. The test can be performed with a constant or variable pitch on the surface of the stripe created during the streaking step to measure the elastic properties and the parameters of the stripe. breaking of the rock.
Le fait d'effectuer le test de micro-indentation en accédant à l'échantillon dans la rayure créée au cours de l'étape de rayure permet d'offrir une surface de roche fraîche, c'est-à-dire une surface de roche dont les propriétés ressemblent davantage à celles d'une roche non encore extraite. Les données recueillies sur cette surface de roche fraîche sont donc plus pertinentes que celles qui auraient été récoltées sur une surface ayant été exposée à l'air ambiant.  Performing the micro-indentation test by accessing the sample in the stripe created during the streaking step provides a fresh rock surface, i.e., a rock surface. whose properties are more like those of a rock not yet extracted. The data collected on this fresh rock surface are therefore more relevant than those collected on a surface that has been exposed to ambient air.
Selon un mode de réalisation préféré de l'invention, le piston de l'indenteur muni d'un capteur de force est également fixé sur le portique. La levée et la descente de l'indenteur sont faites de manière automatique. Les déplacements différentiels de l'indenteur par rapport à la surface de la roche sont mesurés grâce à trois capteurs, par exemple des capteurs LVDT, dont un fixé près de l'indenteur, les deux autres fixés sur le portique.  According to a preferred embodiment of the invention, the piston of the indenter provided with a force sensor is also fixed on the gantry. The lifting and lowering of the indenter are done automatically. The differential displacements of the indenter with respect to the surface of the rock are measured thanks to three sensors, for example LVDT sensors, one of which is fixed near the indenter, the two others fixed on the gantry.
La force et le déplacement sont enregistrés par l'ordinateur 20. Le pas de mesure est variable selon le besoin, par exemple le pas de mesure est compris entre 5 à 10 cm.  The force and the displacement are recorded by the computer 20. The measurement step is variable according to the need, for example the measurement step is between 5 to 10 cm.
Au cours de l'étape de mesure des paramètres soniques S3, on mesure des paramètres soniques de l'échantillon de roche. En particulier, les vitesses de propagation des ondes de compression Vp et de cisaillement Vs sont mesurées au cours de l'étape de mesure des paramètres soniques. During the measurement step of the sonic parameters S3, sonic parameters of the rock sample are measured. In particular, the propagation velocities of the compression waves V p and the shear stress V s are measured during the step of measuring the sonic parameters.
Selon un mode de réalisation préféré de l'invention, les mesures des vitesses de propagation sont réalisées sur la surface laissée suite à l'étape de rayure et dans les intervalles de tests de la micro-indentation.  According to a preferred embodiment of the invention, the measurements of the propagation speeds are carried out on the surface left following the scratch step and in the test intervals of the micro-indentation.
Selon un mode de réalisation de l'invention, après le passage de la lame lors de l'étape de rayure, on obtient une rayure (une surface) lisse sur l'échantillon de roche. Le portique 16 revient à sa position de départ. According to one embodiment of the invention, after the passage of the blade during the stripping step, we obtain a smooth scratch (a surface) on the rock sample. Gantry 16 returns to its starting position.
Les mesures soniques sont réalisées à l'aide d'un émetteur et d'un récepteur placés dans la rayure distants d'une distance prédéterminée, par exemple entre 2 et 10 cm, en particulier d'environ 5 cm. La levée et la descente des capteurs soniques peuvent être réalisées de manière automatique à l'aide d'un bras installé sur le portique 16 et géré par l'ordinateur 20. Une pression constante est imposée sur les capteurs afin d'assurer un bon contact à l'interface roche-capteur. Le pas d'avancement des mesures est constant, par exemple égal à la distance prédéterminée séparant l'émetteur et le récepteur. En particulier, le pas d'avancement peut être égal à 5 cm.  The sonic measurements are performed using a transmitter and a receiver placed in the streak at a distance of a predetermined distance, for example between 2 and 10 cm, in particular about 5 cm. The lifting and lowering sonic sensors can be performed automatically using an arm installed on the gantry 16 and managed by the computer 20. A constant pressure is imposed on the sensors to ensure good contact at the rock-sensor interface. The progress step of the measurements is constant, for example equal to the predetermined distance separating the transmitter and the receiver. In particular, the advancement step may be equal to 5 cm.
Les écoutes d'émission micro-sismiques sont réalisées à l'aide de plusieurs capteurs placés directement sur la carotte et sur le banc d'essai.  The micro-seismic emission listening is carried out using several sensors placed directly on the core and on the test bench.
Au cours de l'étape de détermination des paramètres géomécaniques de l'échantillon S4, les données mesurées sont envoyées vers l'ordinateur 20 qui les traite afin de déterminer des paramètres géomécaniques.  During the step of determining the geomechanical parameters of the sample S4, the measured data is sent to the computer 20 which processes them to determine geomechanical parameters.
Les inventeurs ont pu constater que le regroupement de ces trois mesures sur un seul banc et leur interprétation couplée permettent de caractériser simultanément plusieurs paramètres mécaniques de la roche.  The inventors have found that the combination of these three measurements on a single bench and their coupled interpretation make it possible to simultaneously characterize several mechanical parameters of the rock.
Les propriétés élastiques de la roche peuvent être déterminées par micro-indentation, le module d' Young (E) de la roche à l'échelle millimétrique peut être déterminé en analysant la phase linéaire de la courbe force-déplacement obtenue à chaque point de mesure.  The elastic properties of the rock can be determined by micro-indentation, the Young's modulus (E) of the rock on a millimetric scale can be determined by analyzing the linear phase of the force-displacement curve obtained at each point of measurement. .
La résistance à la compression uniaxiale (Rc) peut être déterminée au cours de l'étape de rayure, en utilisant la relation empirique entre l'énergie spécifique intrinsèque (ξ) et la résistance Rc (résistance à la rupture en compression simple) obtenus sur les échantillons du même type de roche. Au cours de l'étape de rayure, le profil de Rc peut être obtenu tout le long de la carotte. La variabilité de la résistance mécanique à l'échelle millimétrique ou métrique peut être caractérisée. Resistance to uniaxial compression (Rc) can be determined during the scratch step, using the empirical relationship between specific energy intrinsic (ξ) and the resistance Rc (compressive strength in simple compression) obtained on the samples of the same type of rock. During the scratch step, the Rc profile can be obtained all along the core. The variability of the mechanical resistance at the millimetric or metric scale can be characterized.
Les paramètres plastiques, dont l'angle de friction (φ) et la cohésion interne (C) peuvent être déterminés grâce à l'interprétation couplée des données mesurées pendant l'étape de rayure et de la micro-indentation . La force de frottement à l'interface lame-roche ainsi que la force correspondant au point d' inflexion de la courbe force-déplacement de la micro-indentation et la phase non- linéaire de cette courbe sont exploités pour la détermination de ces paramètres.  The plastic parameters, including the friction angle (φ) and the internal cohesion (C) can be determined by the coupled interpretation of the measured data during the scratch step and the micro-indentation. The friction force at the blade-rock interface as well as the force corresponding to the point of inflection of the force-displacement curve of the micro-indentation and the non-linear phase of this curve are used for the determination of these parameters.
L'exploitation de la partie linéaire de la courbe force-déplacement de l'indenteur cylindrique permet de calculer le module d'élasticité (E) .  The exploitation of the linear part of the force-displacement curve of the cylindrical indenter makes it possible to calculate the modulus of elasticity (E).
Les inventeurs proposent d'exploiter à la fois l'énergie spécifique (ξ) fournie par la rayure ; et la force (FR) et le déplacement (eR) du point de la perte linéarité (R) de la courbe force-déplacement de l'indenteur cylindrique pour déterminer l'angle de frottement et la cohésion des roches. The inventors propose to exploit both the specific energy (ξ) provided by the stripe; and the force (F R ) and the displacement (e R ) of the point of the linearity loss (R) of the force-displacement curve of the cylindrical indenter to determine the friction angle and cohesion of the rocks.
Les inventeurs proposent d'exploiter les émissions micro-sismiques pour interpréter les différentes phases de la courbe force-déplacement de la micro-indentation et l'impact de la profondeur de coupe sur la mesure de l'énergie spécifique de la rayure.  The inventors propose to exploit the micro-seismic emissions to interpret the different phases of the force-displacement curve of the micro-indentation and the impact of the depth of cut on the measurement of the specific energy of the scratch.
Les inventeurs proposent de mesurer la dureté Brinell d'un échantillon de roche avec un indenteur sphérique en réalisant un cycle de charge-décharge. Le déplacement irréversible mesuré à la fin de décharge permet de calculer l'indice de Duret Brinell (HB) . The inventors propose to measure the Brinell hardness of a rock sample with a spherical indenter by performing a charge-discharge cycle. The irreversible displacement measured at the end of the discharge makes it possible to calculate the Duret Brinell index (HB).
Les données mécaniques et soniques obtenues sur la même surface de la carotte permettent d'établir avec confiance des corrélations entre les paramètres. De telles corrélations servent pour la construction des Log géomécaniques à l'échelle d'un forage. The mechanical and sonic data obtained on the same surface of the core make it possible to establish with confidence correlations between the parameters. Such correlations are used for the construction of log geomechanics at the scale of a borehole.
L'effet de regrouper les mesures sur un seul banc minimise la dispersion des résultats liés à la préparation des échantillons, et de surcroît offre la possibilité d'effectuer une interprétation couplée des données issues de différentes mesures afin d'obtenir les paramètres mécaniques cohérents.  The effect of grouping measurements on a single bench minimizes the dispersion of sample preparation results, and in addition provides the ability to perform a coupled interpretation of data from different measurements to obtain consistent mechanical parameters.
Avantageusement, la méthode selon l'invention est très efficace pour déterminer les paramètres de rupture des roches, en particulier sur les argiles car une des grandes difficultés des argiles est l'obtention d'échantillons non fissurés .  Advantageously, the method according to the invention is very effective in determining the parameters of rock rupture, in particular on clays because one of the great difficulties of clays is obtaining uncracked samples.
La méthode selon l'invention est applicable sur des petits échantillons, ce qui offre un vaste champ d'application dans les études géomécaniques (par exemple stabilité de forage et de couverture) dans lesquelles les paramètres du critère de rupture sont souvent inconnus en raison de manque des échantillons convenables aux essais classiques.  The method according to the invention is applicable to small samples, which offers a wide field of application in geomechanical studies (for example drilling and roofing stability) in which the parameters of the failure criterion are often unknown due to lack of suitable samples in conventional tests.
En outre, le test de micro-indentation peut être réalisé directement sur des carottes. Ainsi on peut obtenir des valeurs de cohésion C, d'angle de frottement Φ, la dureté Brinell et de module d' Young E à pas constant sur une certaine longueur de carottes.  In addition, the micro-indentation test can be performed directly on carrots. Thus, cohesion values C, angle of friction Φ, Brinell hardness and Young's modulus E can be obtained at a constant pitch over a certain length of core.
Un LOG géomécanique peut être ainsi établi, et il peut être extrapolé sur l'ensemble de formation en utilisant des corrélations avec les autres LOG mesurés dans les forages. Ce LOG constitue une donnée d'entrée pour la modélisation de fracturation hydraulique. A geomechanical LOG can thus be established, and it can be extrapolated to the training set using correlations with the other LOGs measured in drilling. This LOG is an input data for hydraulic fracturing modeling.
L' invention ne se limite pas aux modes de réalisation décrits et doit être interprétée de façon non limitative, en englobant tout mode de réalisation équivalent .  The invention is not limited to the embodiments described and must be interpreted in a non-limiting manner, encompassing any equivalent embodiment.

Claims

REVENDICATIONS
1. Procédé de détermination de paramètres géomécaniques d'un échantillon de roche, comprenant : A method for determining geomechanical parameters of a rock sample, comprising:
- une étape de rayure au cours de laquelle les forces horizontales et verticales fournies à une lame avançant à vitesse constante et à une profondeur de coupe constante le long de l'échantillon pour détruire un volume constant par unité de longueur à la surface de l'échantillon de roche sont mesurées,  a scratch step in which the horizontal and vertical forces provided to a blade advancing at a constant speed and at a constant cutting depth along the sample to destroy a constant volume per unit length at the surface of the rock sample are measured,
- une étape de micro-indentation au cours de laquelle des caractéristiques mécaniques de l'échantillon de roche sont déterminées par micro-indentation,  a micro-indentation step during which mechanical characteristics of the rock sample are determined by micro-indentation,
une étape de détermination des paramètres géomécaniques de l'échantillon au cours de laquelle au moins un paramètre parmi la résistance à la compression uniaxiale, l'angle de friction, la cohésion interne, la dureté Brinell et le module d' Young de la roche est estimé au moyen des mesures effectuées au cours des étapes de rayure et de micro-indentation.  a step of determining the geomechanical parameters of the sample during which at least one parameter among the uniaxial compressive strength, the friction angle, the internal cohesion, the Brinell hardness and the Young's modulus of the rock is estimated using measurements made during the streaking and micro-indentation steps.
2. Procédé selon la revendication 1, dans lequel au cours de l'étape de détermination des paramètres géomécaniques de l'échantillon, la résistance à la compression uniaxiale, l'angle de friction, la cohésion interne, la dureté Brinell et le module d' Young de la roche sont déterminés au moyen des mesures effectuées au cours des étapes de rayure et de micro-indentation. 2. Method according to claim 1, wherein during the step of determining the geomechanical parameters of the sample, the uniaxial compressive strength, the friction angle, the internal cohesion, the Brinell hardness and the modulus of 'Young's rock are determined by means of measurements made during the streaking and micro-indentation steps.
3. Procédé selon la revendication 1, comprenant en outre une étape de mesure des paramètres soniques de l'échantillon de roche et dans lequel au cours de l'étape de détermination des paramètres géomécaniques de l'échantillon le coefficient de Poisson de la roche est déterminé . The method of claim 1, further comprising a step of measuring the sonic parameters of the rock sample and wherein during the step of determining the geomechanical parameters of the sample the Poisson's ratio of the rock is determined.
4. Procédé selon la revendication 3, dans lequel les paramètres soniques comprennent les vitesses de propagation des ondes de compression et de cisaillement. The method of claim 3, wherein the sonic parameters comprise the propagation velocities of the compression and shear waves.
5. Procédé selon l'une des revendications précédentes dans lequel les mesures de micro-indentation et/ou des paramètres soniques sont réalisées dans la rayure créée au cours de l'étape de rayure. 5. Method according to one of the preceding claims wherein the micro-indentation measurements and / or sonic parameters are made in the stripe created during the streaking step.
6. Procédé selon l'une des revendications précédentes dans lequel les émissions micro-sismiques sont enregistrées pendant la rayure et la micro-indentation. 6. Method according to one of the preceding claims wherein the micro-seismic emissions are recorded during scratching and micro-indentation.
7. Procédé selon l'une des revendications précédentes dans lequel l'échantillon de roche est sous la forme d'une carotte et les étapes de mesures et de détermination des paramètres géomécaniques de l'échantillon sont répétées le long de l'échantillon. 7. Method according to one of the preceding claims wherein the rock sample is in the form of a core and the steps of measuring and determining the geomechanical parameters of the sample are repeated along the sample.
8. Procédé selon l'une des revendications précédentes dans lequel l'échantillon est photographié pendant les étapes de mesures. 8. Method according to one of the preceding claims wherein the sample is photographed during the measurement steps.
9. Produit programme informatique comportant des instructions pour la mise en œuvre d'un procédé selon l'une des revendications 1 à 8, lorsque ce programme est exécuté par un processeur. 9. Computer program product comprising instructions for the implementation of a method according to one of claims 1 to 8, when the program is executed by a processor.
10. Dispositif de mesure des paramètres géomécaniques d'un échantillon de roche, le dispositif comprenant : 10. A device for measuring the geomechanical parameters of a rock sample, the device comprising:
- un banc d'essai destiné à recevoir un échantillon de roche, - a test bench intended to receive a sample Rock,
un portique dont le mouvement le long de l'échantillon est contrôlé et comprenant des instruments de micro-indentation et de rayure,  a gantry whose movement along the sample is controlled and comprising instruments of micro-indentation and scratching,
- Plusieurs capteurs d'écoute des émissions acoustiques placés sur l'échantillon et sur le banc d' essai .  - Several acoustic emission monitoring sensors placed on the sample and on the test bench.
- un ordinateur contrôlant le mouvement du portique le long de l'échantillon, configuré pour recevoir les données mesurées par les instruments fixé au portique et comprenant des moyens de calcul permettant à partir des données reçues de déterminer au moins un paramètre parmi la résistance à la compression uniaxiale, l'angle de friction, la cohésion interne, la dureté Brinell, et le module d' Young de l'échantillon de roche.  a computer controlling the movement of the gantry along the sample, configured to receive the data measured by the instruments fixed to the gantry and comprising calculation means making it possible, from the received data, to determine at least one parameter among the resistance to the uniaxial compression, friction angle, internal cohesion, Brinell hardness, and Young's modulus of the rock sample.
11. Dispositif de mesure selon la revendication 10, dont le portique comprend en outre un instrument de mesure des paramètres soniques de l'échantillon de roche, et 11. Measuring device according to claim 10, whose gantry further comprises an instrument for measuring the sonic parameters of the rock sample, and
ledit ordinateur est configuré pour recevoir également les données mesurées par l'instrument de mesure des paramètres soniques et comprend en outre des moyens de calcul permettant à partir des données reçues de déterminer le coefficient de Poisson de l'échantillon de roche, et  said computer is configured to also receive the data measured by the sonic parameter measuring instrument and further comprises calculating means from the received data to determine the Poisson's ratio of the rock sample, and
ledit ordinateur est configuré également pour enregistre les signaux des capteurs d'écoute des émissions micro-sismiques .  said computer is also configured to record the signals of the listening sensors of the micro-seismic emissions.
EP13719950.1A 2012-04-12 2013-03-29 Method for determining geomechanical parameters of a rock sample Withdrawn EP2836814A1 (en)

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