CN112834725A - Rock drillability prediction method, device and system - Google Patents
Rock drillability prediction method, device and system Download PDFInfo
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention provides a method, a device and a system for predicting rock drillability, wherein the method comprises the following steps: acquiring two or more drillable factor parameters of rocks in a stratum to be drilled; determining the grade of each drillable factor parameter according to the drillable factor parameters; comprehensively obtaining the drillability factor of the rock according to the grade of the drillable factor parameter; and predicting the drillability result of the rock according to the drillability factor. By comprehensively drilling multiple factors of the rock, the drillability result of the rock can be more accurately and reliably obtained so as to guide the drilling work, and further the cost of oil and gas drilling is reduced.
Description
Technical Field
The invention relates to the technical field of oil and gas exploration and development, in particular to a rock drillability prediction method, device and system.
Background
With the continuous development of oil and gas exploration and development, oil and gas drilling puts forward higher requirements. The development of oil and gas fields in China has wide development prospect, and more clean energy can be provided if the exploitation degree of the geological storage of the oil and gas fields is greatly improved.
Rock drillability is an important problem in oil and gas drilling engineering, and depends on the lithology of rock and the geological transformation effect after diagenesis, which deeply influences the work of selecting a drill bit in the drilling engineering and the like.
In the oil and gas drilling process, a proper drill bit is selected to drill along a preset track and keep the stability of a well hole, and the evaluation result of the drillability of the rock has great influence on the drilling. Rock drillability is a dependent variable with more influencing factors, and petroleum engineers usually influence the evaluation of the rock drillability only by considering a single factor or because the factors are not completely considered, so that the evaluation result of the rock drillability is not accurate enough, and the drilling work cannot be effectively guided.
Disclosure of Invention
The invention provides a method, a device and a system for predicting the drillability of rocks, which are used for more accurately and reliably obtaining the drillability result of the rocks by comprehensively drilling the multiple factors of the rocks so as to guide the drilling work and further reduce the cost of oil and gas drilling.
In a first aspect, an embodiment of the present invention provides a method for predicting rock drillability, including:
acquiring two or more drillable factor parameters of rocks in a stratum to be drilled;
determining the grade of each drillable factor parameter according to the drillable factor parameters;
comprehensively obtaining the drillability factor of the rock according to the grade of the drillable factor parameter;
and predicting the drillability result of the rock according to the drillability factor.
In one possible design, the drillable factor parameters include:
uniaxial compressive strength of rock, wear resistance of rock, integrity of rock, and the angle of rock bedding to the well axis.
In one possible design, determining a grade for each of the drillable factor parameters based on the drillable factor parameters includes:
and matching the drillable factor parameters with corresponding grade ranges, and determining the grade corresponding to each drillable factor parameter, wherein the grade is provided with a corresponding data value.
In one possible design, the drillability factors of the corresponding rocks are comprehensively obtained according to the grade of the drillable factor parameters, and the method comprises the following steps:
obtaining a corresponding grade square and a grade sum according to the grade of the drillable factor parameter;
obtaining a ratio of a sum of squares of each rank to a sum of the ranks;
and carrying out average processing on the ratio to obtain the drillability factor of the corresponding rock.
In one possible design, predicting a drillability result of the rock based on the drillability factor includes:
predicting the drillability result of the rock according to the threshold value range of the drillability factor; wherein different said threshold ranges correspond to different drillability results.
In a second aspect, an embodiment of the present invention provides a device for predicting rock drillability, including:
the system comprises an acquisition module, a data processing module and a data processing module, wherein the acquisition module is used for acquiring two or more drillable factor parameters of rocks in a stratum to be drilled;
the determining module is used for determining the grade of each drillable factor parameter according to the drillable factor parameters;
the obtaining module is used for comprehensively obtaining the drillability factor of the rock according to the grade of the drillable factor parameter;
and the prediction module is used for predicting the drillability result of the rock according to the drillability factor.
In one possible design, the drillable factor parameters include:
uniaxial compressive strength of rock, wear resistance of rock, integrity of rock, and the angle of rock bedding to the well axis.
In one possible design, the determining module is specifically configured to:
and matching the drillable factor parameters with corresponding grade ranges, and determining the grade corresponding to each drillable factor parameter, wherein the grade is provided with a corresponding data value.
In one possible design, the obtaining module is specifically configured to:
obtaining a corresponding grade square and a grade sum according to the grade of the drillable factor parameter;
obtaining a ratio of a sum of squares of each rank to a sum of the ranks;
and carrying out average processing on the ratio to obtain the drillability factor of the corresponding rock.
In one possible design, the prediction module is specifically configured to:
predicting the drillability result of the rock according to the threshold value range of the drillability factor; wherein different said threshold ranges correspond to different drillability results.
In a third aspect, an embodiment of the present invention provides a system for predicting rock drillability, including: the memory and the processor are used for storing the executable instructions after the processing; wherein the processor is configured to perform the method of predicting rock drillability of any one of the first aspects via execution of the executable instructions.
In a fourth aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the method for predicting rock drillability according to any one of the first aspect.
The invention provides a method, a device and a system for predicting rock drillability, wherein the method comprises the following steps: acquiring two or more drillable factor parameters of rocks in a stratum to be drilled; determining the grade of each drillable factor parameter according to the drillable factor parameters; comprehensively obtaining the drillability factor of the rock according to the grade of the drillable factor parameter; and predicting the drillability result of the rock according to the drillability factor. By comprehensively drilling multiple factors of the rock, the drillability result of the rock can be more accurately and reliably obtained so as to guide the drilling work, and further the cost of oil and gas drilling is reduced.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of an application scenario of the present invention;
FIG. 2 is a flow chart of a method for predicting rock drillability according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of rock classification in the prior art;
FIG. 4 is a schematic diagram of a grade range in a rock drillability prediction method according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a rock drillability prediction device according to a second embodiment of the present invention;
fig. 6 is a schematic structural diagram of a rock drillability prediction system provided by a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The following describes the technical solutions of the present invention and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present invention will be described below with reference to the accompanying drawings.
Rock is one of the substances constituting the earth's crust and is mainly classified into igneous rock (magma rock), sedimentary rock and metamorphic rock according to its cause. Igneous rocks are rocks which are solidified after cooling lava or magma. Rock drillability refers to the ability of rock to resist drill cuttings, reflecting the ease with which a borehole is drilled. Rock drillability profoundly affects the performance of drilling projects.
FIG. 1 is a schematic diagram of an application scenario of the present invention, as shown in FIG. 1, a rock drillability prediction system 11 obtains two or more drillable factor parameters of a formation rock 12 to be drilled according to an embodiment of the present invention; determining the grade of each drillable factor parameter according to the drillable factor parameters; comprehensively obtaining the drillability factor of the rock according to the grade of the drillability factor parameter; according to the drillability factor, the drillability result of the rock can be predicted, the multi-factor of the drilling rock is integrated, and the drillability result of the rock can be more accurately and reliably obtained so as to guide the drilling work and further reduce the cost of oil and gas drilling.
Fig. 2 is a flowchart of a method for predicting rock drillability according to an embodiment of the present invention, and as shown in fig. 2, the method in this embodiment may include:
s201, two or more drillable factor parameters of rocks in a stratum to be drilled are obtained.
Specifically, the stratum to be drilled is the stratum in the area where oil extraction and drilling exploration are needed. The drillability parameter represents a factor affecting the drillability of the rock and may include: uniaxial compressive strength of rock, wear resistance of rock, integrity of rock mass, and the angle of rock bedding (or fracture faces) to the well axis.
In the prior art, because different drilling methods are adopted, the expression modes of rock drillability are different, for example, a 12-grade rock classification table adopted in China is obtained according to actual calibrated mechanical rotation speed, specifically referring to the following fig. 3, fig. 3 is a schematic diagram of rock classification in the prior art, and as shown in fig. 3, the rock classes are gradually divided into hard classes and the hardest classes from soft classes. The method partially reflects the physical and mechanical properties of the rock, can reflect the level of a drilling process and drilling equipment, and still cannot comprehensively predict the drillability.
In this example, uniaxial compressive strength of rock: when the rock is unidirectionally pressed to be damaged, the load born by the unit area is called compressive strength for short. The wear resistance of rock refers to the ability of the rock surface to resist wear. The integrity of the rock mass is the square of the ratio of the longitudinal wave velocities of the rock mass and the rock, and can be obtained by a dynamic method. The angle of the rock bedding (or fracture face) to the well axis refers to the angle of the fracture (or fracture face) in the rock that occurs due to loss of rock cohesion to the well axis. And the above-mentioned every drillable factor parameter acquisition method can refer to the traditional technology to go on, obtain two or more drillable factor parameters of rock in the stratum to be drilled, namely the influence factor of drillability. In an alternative embodiment, the uniaxial compressive strength of the rock is obtained through a conventional rock mechanics experiment or a dynamic and static rock mechanics parameter conversion relation based on logging data; the CAI value of the wear resistance of the rock can be obtained through a wear resistance experiment; the integrity of the rock mass can be determined according to the core acquisition rate; the angle between the rock bedding (or fracture face) and the well axis can be determined from the formation information of the core or outcrop fracture and the wellbore trajectory. In the process of obtaining the rock drillability, the method uses all the influence factor data of the rock in the stratum related to the drilling, and obtains a plurality of drillability factor parameters of the rock in the stratum to be drilled, namely the influence factors considered by the method are comprehensive, so that the obtained rock drillability result is more accurate, and the method can be used for guiding the drilling work and has the effect of reducing the cost of oil and gas drilling.
S202, determining the grade of each drillable factor parameter according to the drillable factor parameters.
Specifically, the drillable factor parameters are matched with corresponding grade ranges, and the grade corresponding to each drillable factor parameter is determined, wherein the grade is provided with a corresponding data value.
In this embodiment, each drillable factor parameter may be sequentially divided into 4 levels from small to large or from small to large, and each level corresponds to a certain data value, and the data value corresponding to each level is not specifically limited in this embodiment, for example, the data values from the first level to the fourth level correspond to values 1 to 4, which is taken as an example for detailed description in order to obtain drillability factors later.
Specifically, the grade range corresponding to each drillable factor parameter may refer to fig. 4, where fig. 4 is a schematic diagram of the grade ranges in the rock drillability prediction method according to an embodiment of the present invention, and the grade ranges are sequentially divided as shown in fig. 4.
For example, the first grade of uniaxial compressive strength of the rock corresponds to a grade range of 150MPa-200MPa, corresponding to the interval four represented by the first row and the fourth column of cells in fig. 4, while the first grade corresponds to a data value of 1. The corresponding grade range of the second grade is 100MPa-150MPa, which corresponds to the interval three represented by the first row and the third column of cells in FIG. 4, and the corresponding data value of the second grade is 2. The unit of the third level is 50MPa-100MPa, which corresponds to the interval two shown in the first row and the second column of the cells in fig. 4, and the data value corresponding to the third level is 3. The fourth level corresponds to a level range of 0-50MPa, corresponding to the interval one represented by the first row and the first column of cells in fig. 4, and the data value of the fourth level is 4.
For example, the first grade of the wear resistance CAI value of the rock corresponds to a grade range of 3-4, corresponding to the interval four represented by the second row and the fourth column of cells in fig. 4, while the first grade corresponds to a data value of 1. The corresponding level range of the second level is 2-3, which corresponds to the interval three represented by the cell in the third column of the second row in fig. 4, and the corresponding data value of the second level is 2. The third level corresponds to a level range of 1-2, which corresponds to the interval two represented by the second row and the second column of cells in fig. 4, and the data value corresponding to the second level is 3. The fourth level corresponds to a level range of 0-1 corresponding to the interval one represented by the second row and the first column of cells in fig. 4, and the data value corresponding to the fourth level is 4.
For another example, the first level of rock integrity corresponds to a level range of 0-25%, which corresponds to the interval one represented by the first column of cells in the third row in fig. 4, and the data value corresponding to the first level is 1. The corresponding grade range of the second grade is 25% -50%, which corresponds to the interval two represented by the second row and the second column of cells in the third row in fig. 4, and the corresponding data value of the second grade is 2. The third level corresponds to a level range of 50% -75%, which corresponds to the interval three indicated by the cell in the third row and the third column of fig. 4, and the data value of the third level is 3. The fourth level corresponds to a level range of 75% -100%, which corresponds to a section four shown by a cell in the third row and the fourth column in fig. 4, and the data value corresponding to the fourth level is 4.
For another example, the first grade of the angle between the rock bedding/fracture surface and the well axis corresponds to a grade range of 0-22.5 °, which corresponds to the interval one represented by the cell in the first column of the fourth row in fig. 4, and the data value corresponding to the first grade is 1. The second level corresponds to a level in the range of 22.5 ° -45 ° corresponding to the interval two represented by the second column of cells in the fourth row in fig. 4, while the second level corresponds to a data value of 2. The third level corresponds to a level in the range of 45 deg. -67.5 deg., corresponding to the interval three represented by the fourth row and the third column of cells in fig. 4, while the third level corresponds to a data value of 3. The fourth level corresponds to a level in the range of 67.5 deg. -90 deg., corresponding to the interval four represented by the fourth row and column of cells in fig. 4, while the fourth level corresponds to a data value of 4.
Thus, the levels of uniaxial compressive strength of the rock, the value of the wear resistance CAI of the rock are ranked in order from greater to lesser in the example of fig. 4, while the levels corresponding to the integrity of the rock mass, the angle of the rock bedding/fracture face to the well axis, etc. are ranked in order from lesser to greater in the example of fig. 4.
For example, the uniaxial compressive strength of the sandstone of the formation to be drilled is experimentally determined to be 120MPa, which corresponds to the interval three in fig. 4 and corresponds to the second grade, and is calibrated by the number 2; the test determines a wear resistance CAI value of 2.2, corresponding to interval three in fig. 4, corresponding to the second grade, marked with the number 2; according to the core acquisition rate of the relevant area, the integrity of the rock mass is estimated to be 68%, and the rock mass is calibrated by a number 3 corresponding to the interval three and the third grade in the graph 4; and determining the included angle between the fracture surface and the well axis to be 30-40 degrees according to the statistics of the fracture appearance of the related outcrop and the core, wherein the corresponding interval is three in the figure 4, the corresponding interval corresponds to a third grade, and the third grade is calibrated by a number 3.
S203, comprehensively obtaining the drillability factor of the rock according to the grade of the drillable factor parameter;
specifically, according to the grade of the drillable factor parameter, obtaining the corresponding grade square and grade sum;
obtaining the ratio of the sum of squares of each grade to the sum of the grades;
and averaging the values to obtain the drillability factors of the corresponding rocks.
In this embodiment, the calculation of the rock drillability factor may adopt the following formula:
wherein RD is drillability factor of rock and is dimensionless; k is a radical ofiThe grade corresponding to the drillable factor parameter can be numbers 1, 2, 3 and 4 without dimension. The present embodiment is not limited thereto.
When the uniaxial compressive strength and the wear resistance CA of the rock are detectedAfter drillable factor parameters such as I value, integrity of rock mass, and included angle between rock bedding (or fracture surface) and well axis are determined, grades corresponding to the drillable factor parameters are determined, corresponding grade data values are obtained, and then the grade data values are correspondingly brought into kiAnd substituting the calculated value into a calculation formula of the rock drillability factor to finally comprehensively obtain the rock drillability factor RD. And predicting the drillability result of the rock by using the obtained drillability factor RD.
And S204, predicting the drillability result of the rock according to the drillability factor.
Specifically, according to the drillability factor RD of the rock, the manner or standard for predicting the result of the drillability of the rock is as follows: predicting the drillability result of the rock according to the threshold range of the drillability factor; wherein different threshold ranges correspond to different drillability results.
In this embodiment, if the rock drillability factor is within the threshold range of 0.25-0.4, the rock drillability result is predicted to be extremely poor; if the rock drillability factor is in the threshold range of 0.4-0.6, the rock drillability result is predicted to be poor; if the rock drillability factor is in the threshold range of 0.6-0.8, the rock drillability result is predicted to be better; the rock drillability factor is above the 0.8 threshold range, the predicted drillability result is excellent. The present embodiment does not limit the specific content of the threshold range. In an alternative embodiment, the threshold range may vary depending on the level corresponding to the set data value.
With the above example, the uniaxial compressive strength of the sandstone of the formation to be drilled is experimentally determined to be 120MPa, which corresponds to the second grade and is calibrated by the number 2; the experimental determination shows that the CAI value of the wear resistance is 2.2, and the CAI value corresponds to a second grade and is calibrated by a number 2; estimating the integrity of the rock mass to be 68% according to the core acquisition rate of the relevant area, and calibrating by using a number 3 corresponding to a third grade; and determining the included angle between the fracture surface and the well axis to be 30-40 degrees according to the statistics of the fracture appearance of the related outcrop and the core, and calibrating by using a number 3 corresponding to a third grade. That is, k1 ═ 2, k2 ═ 2, k3 ═ 3, and k4 ═ 3 are obtained, and the formula for calculating the rock drillability factor is substituted:
is obtained by specific calculation
According to the threshold range of 0.6-0.8 that the rock drillability factor 0.65 belongs to, the drillability is predicted to be better.
According to the rock drillability prediction method provided by the embodiment of the invention, in the process of obtaining the rock drillability, all the influence factor data related to drilling of rocks in the stratum are used, namely the influence factors considered by the method are comprehensive, so that the obtained rock drillability result is more accurate, the drilling work can be effectively guided, and the effect of reducing the oil and gas drilling cost is achieved. In addition, in the embodiment, the drillable factor parameters related to each drilling well are graded, and the rock drillability is predicted by using the graded numbers, so that very visual rock drillability data can be obtained, and a user can directly judge the drillability by using the rock drillability data, so that the method is convenient and fast.
Fig. 5 is a schematic structural diagram of a rock drillability prediction device according to a second embodiment of the present invention, and as shown in fig. 5, the rock drillability prediction device according to this embodiment may include:
the acquisition module 31 is used for acquiring two or more drillable factor parameters of rocks in a stratum to be drilled;
a determining module 32 for determining a grade of each drillable factor parameter based on the drillable factor parameters;
an obtaining module 33, configured to comprehensively obtain a drillability factor of the rock according to the grade of the drillable factor parameter;
and a prediction module 34 for predicting a drillability result of the rock based on the drillability factor.
In an alternative embodiment, the drillable factor parameters include:
uniaxial compressive strength of rock, wear resistance of rock, integrity of rock, and the angle of rock bedding to the well axis.
In an alternative embodiment, the determining module 32 is specifically configured to:
and matching the drillable factor parameters with the corresponding grade ranges, and determining the grade corresponding to each drillable factor parameter, wherein the grade is provided with a corresponding data value.
In an alternative embodiment, the obtaining module 31 is specifically configured to:
obtaining a corresponding grade square and a grade sum according to the grade of the drillable factor parameter;
obtaining the ratio of the sum of squares of each grade to the sum of the grades;
and averaging the values to obtain the drillability factors of the corresponding rocks.
In an alternative embodiment, the prediction module 34 is specifically configured to:
predicting the drillability result of the rock according to the threshold range of the drillability factor; wherein different threshold ranges correspond to different drillability results.
The prediction apparatus for rock drillability of this embodiment may implement the technical solution in the method shown in fig. 2, and the specific implementation process and technical principle thereof refer to the related description in the method shown in fig. 2, and are not described herein again.
Fig. 6 is a schematic structural diagram of a rock drillability prediction system provided by a third embodiment of the present invention, and as shown in fig. 6, the rock drillability prediction system 40 of this embodiment may include: a processor 41 and a memory 42.
A memory 42 for storing a computer program (e.g., an application program, a functional module, etc. implementing the above-described method of predicting rock drillability), computer instructions, etc.;
the computer programs, computer instructions, etc. described above may be stored in one or more memories 42 in partitions. And the above-mentioned computer program, computer instructions, data, etc. can be called by the processor 41.
A processor 41 for executing the computer program stored in the memory 42 to implement the steps of the method according to the above embodiments.
Reference may be made in particular to the description relating to the preceding method embodiment.
The processor 41 and the memory 42 may be separate structures or may be integrated structures integrated together. When the processor 41 and the memory 42 are separate structures, the memory 42 and the processor 41 may be coupled by a bus 43.
The server in this embodiment may execute the technical solution in the method shown in fig. 2, and for the specific implementation process and the technical principle, reference is made to the relevant description in the method shown in fig. 2, which is not described herein again.
In addition, embodiments of the present application further provide a computer-readable storage medium, in which computer-executable instructions are stored, and when at least one processor of the user equipment executes the computer-executable instructions, the user equipment performs the above-mentioned various possible methods.
Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. Additionally, the ASIC may reside in user equipment. Of course, the processor and the storage medium may reside as discrete components in a communication device.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method of predicting drillability of rock, comprising:
acquiring two or more drillable factor parameters of rocks in a stratum to be drilled;
determining the grade of each drillable factor parameter according to the drillable factor parameters;
comprehensively obtaining the drillability factor of the rock according to the grade of the drillable factor parameter;
and predicting the drillability result of the rock according to the drillability factor.
2. The method of claim 1, wherein the drillable factor parameters comprise:
uniaxial compressive strength of rock, wear resistance of rock, integrity of rock, and the angle of rock bedding to the well axis.
3. The method of claim 2, wherein determining a grade for each of the drillable factor parameters based on the drillable factor parameters comprises:
and matching the drillable factor parameters with corresponding grade ranges, and determining the grade corresponding to each drillable factor parameter, wherein the grade is provided with a corresponding data value.
4. The method of claim 1, wherein obtaining a drillability factor for a corresponding rock based on the grade of the drillable factor parameter comprises:
obtaining a corresponding grade square and a grade sum according to the grade of the drillable factor parameter;
obtaining a ratio of a sum of squares of each rank to a sum of the ranks;
and carrying out average processing on the ratio to obtain the drillability factor of the corresponding rock.
5. The method of claim 1, wherein predicting the drillability outcome for the rock based on the drillability factor comprises:
predicting the drillability result of the rock according to the threshold value range of the drillability factor; wherein different said threshold ranges correspond to different drillability results.
6. A device for predicting drillability of rock, comprising:
the system comprises an acquisition module, a data processing module and a data processing module, wherein the acquisition module is used for acquiring two or more drillable factor parameters of rocks in a stratum to be drilled;
the determining module is used for determining the grade of each drillable factor parameter according to the drillable factor parameters;
the obtaining module is used for comprehensively obtaining the drillability factor of the rock according to the grade of the drillable factor parameter;
and the prediction module is used for predicting the drillability result of the rock according to the drillability factor.
7. The apparatus of claim 6, wherein the drillable factor parameters comprise:
uniaxial compressive strength of rock, wear resistance of rock, integrity of rock, and the angle of rock bedding to the well axis.
8. The apparatus of claim 7, wherein the determining module is specifically configured to:
and matching the drillable factor parameters with corresponding grade ranges, and determining the grade corresponding to each drillable factor parameter, wherein the grade is provided with a corresponding data value.
9. A system for predicting drillability of rock, comprising: the memory and the processor are used for storing the executable instructions after the processing; wherein the processor is configured to perform the method of predicting rock drillability of any one of claims 1-5 via execution of the executable instructions.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method of predicting the drillability of rock according to any one of the claims 1-5.
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