CN113761766A - Method and device for predicting residual energy of perforation explosion and storage medium - Google Patents
Method and device for predicting residual energy of perforation explosion and storage medium Download PDFInfo
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Abstract
The invention relates to a method, a device and a storage medium for predicting residual energy of perforation explosion, wherein the method comprises the following steps: acquiring a formation relation of perforation explosion energy in a shaft, and establishing an equivalent energy model released into the shaft by perforation; establishing a finite element calculation model corresponding to a perforating bullet in the perforating gun according to the equivalent energy model; extracting energy simulation data corresponding to different moments based on the finite element model; and determining the proportion of the perforation residual energy in the final shaft according to the energy simulation data. The method for determining the residual energy of the perforating explosion in the shaft meets the explosion conditions of the real perforating charge on site, greatly improves the accuracy of predicting the residual energy of the perforating explosion in the shaft, and can scientifically provide theoretical basis for the optimization design of the perforating charge on site.
Description
Technical Field
The invention relates to the technical field of perforation safety, in particular to a method and a device for predicting residual energy of perforation explosion and a storage medium.
Background
The shaped charge is widely applied to the exploitation of petroleum and natural gas due to the excellent performances of strong penetrability, energy concentration and the like. The formation of shaped jets is an extremely complex physical and chemical process, and explosions can generate local overpressures of up to several hundred or even several gigapascals on a subtle time scale. The jet penetrates the casing and formation while some energy is released into the wellbore. This energy is the primary source of wellbore safety threat and is affected by the perforating gun type and other perforation conditions. Since the solution of the downhole perforation dynamic process is very complex, the establishment of the finite element model to the submission of the calculation have many problems, such as: model simplification, model numerical calculation, method selection, non-convergence of model calculation and the like, and a series of subject knowledge needs to be comprehensively applied to solve the problems, so that the theoretical difficulties are overcome.
The existing method for predicting the residual energy of perforation explosion in a shaft at home and abroad is not reported in detail, and because perforation research relates to multidisciplinary intersection, the energy conversion process of underground perforation is difficult to be comprehensively analyzed by adopting a theoretical method at present. The indoor perforating bullet experiment method consumes large manpower and material resources, has high safety risk, and simultaneously, the existing measurement technology is difficult to capture real physical phenomena and comprehensively acquire dynamic data. In conclusion, how to efficiently and conveniently predict the residual energy of perforation explosion in a shaft is an urgent problem to be solved.
Disclosure of Invention
In view of the above, it is desirable to provide a method, an apparatus and a storage medium for predicting residual energy of perforation explosion, so as to solve the problems of the prior art that the method for predicting residual energy of perforation explosion in a wellbore is complex and has site limitations.
The invention provides a method for predicting residual energy of perforation explosion, which comprises the following steps:
acquiring a formation relation of perforation explosion energy in a shaft, and establishing an equivalent energy model of perforation release into the shaft;
establishing a finite element calculation model corresponding to a perforating bullet in the perforating gun according to the equivalent energy model;
extracting energy simulation data corresponding to different moments based on the finite element model;
and determining the proportion of the perforation residual energy in the final shaft according to the energy simulation data.
Further, the composition relationship is expressed by the following formula:
Et＝Ej+Ew+El
wherein E istRepresenting the total explosive energy, E, of the chargejIndicating the energy required to form the jet, EwRepresenting wellbore perforation residual energy; elIndicating other lost energy from the perforating process.
Further, the equivalent energy model is represented by the following formula:
wherein, WeRepresenting the equivalent explosive mass, W representing the charge of the perforating charge,
indicating the rate of perforation energy remaining.
Further, the establishing a finite element calculation model corresponding to the perforating charges in the perforating gun according to the equivalent energy model comprises:
analyzing the composition of residual energy of perforation in the shaft according to the equivalent energy model;
and establishing a three-dimensional physical model aiming at the explosive charge of the perforating charge in the perforating gun according to the composition of the perforating residual energy in the shaft, and forming the corresponding finite element calculation model.
Further, the extracting the explosive energy data and the jet energy data corresponding to different moments based on the finite element model comprises:
performing finite element calculation based on the finite element model;
and extracting explosive energy data and jet flow energy data corresponding to different moments based on the finite element calculation result of the finite element model.
Further, the performing finite element calculation based on the finite element model includes:
establishing a corresponding grid model by adopting Lagrange and Euler algorithms based on the finite element model;
determining corresponding state equations and material model parameters according to the grid model to form a complete model;
and inputting the complete model in a k file form, and developing numerical simulation calculation to form the finite element calculation result.
Further, the energy simulation data includes explosive energy data and jet flow energy data, and the extracting energy simulation data corresponding to different times based on the finite element calculation result of the finite element model includes:
obtaining a jet pressure cloud chart in the formation process of the energy-gathered jet based on the finite element calculation result of the finite element model;
and extracting the explosive energy data and the jet flow energy data corresponding to different moments according to the jet flow pressure cloud picture.
Further, the energy simulation data comprises explosive energy data and jet flow energy data, and the determining the proportion of the perforation residual energy in the final shaft according to the energy simulation data comprises:
determining a first difference value according to the difference between the explosive energy data and the jet flow energy data corresponding to different moments;
and determining the proportion of the perforation residual energy in the final shaft corresponding to different moments according to the proportion of the first difference value and the explosive energy data.
The invention also provides a device for predicting the residual energy of perforation explosion, which comprises:
the acquiring unit is used for acquiring the formation relation of perforation explosion energy in the shaft and establishing an equivalent energy model released into the shaft by perforation;
the processing unit is used for establishing a finite element calculation model corresponding to the perforating charge in the perforating gun according to the equivalent energy model; the energy simulation system is also used for extracting energy simulation data corresponding to different moments based on the finite element model;
and the prediction unit is used for determining the proportion of the perforation residual energy in the final shaft according to the energy simulation data.
The present invention also provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of predicting residual energy of a perforating explosion as described above.
Compared with the prior art, the invention has the beneficial effects that: firstly, effectively acquiring a formation relation of perforation explosive energy in a shaft, and establishing a theoretical model of a perforation residual energy equivalent explosive block in the shaft, namely an equivalent energy model, based on the formation relation so as to feed back the condition of residual energy released into the shaft by perforation; then, establishing a finite element calculation model of the perforating charge in the perforating gun based on the equivalent energy model so as to carry out efficient simulation on the explosion process; further, according to a finite element calculation result, an energy-gathered jet forming process is obtained, explosive energy data and jet energy data at different moments are extracted, and the explosion condition of a jet hole in a shaft is reflected; and finally, predicting the residual energy of the perforation in the shaft through energy conversion analysis according to the explosive energy data and the jet energy data, and determining the proportion of the residual energy of the perforation in the shaft finally. In conclusion, the method for determining the residual energy of the perforating explosion in the shaft meets the explosion conditions of the real perforating charge on site, greatly improves the accuracy of predicting the residual energy of the perforating explosion in the shaft, and can scientifically provide a theoretical basis for the optimization design of the site perforating.
Drawings
FIG. 1 is a schematic diagram illustrating an embodiment of an application system of the method for predicting residual energy of perforation explosion provided by the present invention;
FIG. 2 is a schematic flow chart illustrating an embodiment of a method for predicting residual energy of a perforating explosion provided by the present invention;
FIG. 3 is a model schematic diagram of an embodiment of a perforating bullet calculation model in a perforating gun provided by the present invention;
FIG. 4 is a flowchart illustrating an embodiment of step S2 in FIG. 2 according to the present invention;
FIG. 5 is a flowchart illustrating an embodiment of step S3 in FIG. 2 according to the present invention;
FIG. 6 is a flowchart illustrating an embodiment of step S31 in FIG. 5 according to the present invention;
FIG. 7 is a flowchart illustrating an embodiment of step S32 in FIG. 5 according to the present invention;
FIG. 8 is a flowchart illustrating an embodiment of step S4 in FIG. 2 according to the present invention;
FIG. 9 is a schematic diagram of one embodiment of the resulting shaped jet pressure from the numerical simulation provided by the present invention;
fig. 10 is a structural diagram of an apparatus for predicting the residual energy of perforation explosion according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention and not to limit its scope.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Further, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Reference throughout this specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the described embodiments can be combined with other embodiments.
The invention provides a method, a device and a storage medium for predicting residual energy of perforation explosion, which are applied to a perforation safety prediction process, utilize the composition relation of perforation explosion energy in a shaft to perform various modeling analyses, and provide a new idea for improving the prediction efficiency of the residual energy of the perforation in the shaft. The following are detailed below:
an application system of the method for predicting the residual energy of the perforating explosion is provided in an embodiment of the invention, and fig. 1 is a scene schematic diagram of an embodiment of the application system of the method for predicting the residual energy of the perforating explosion provided in the invention, and the system may include a server 100, and a device for predicting the residual energy of the perforating explosion, such as the server in fig. 1, is integrated in the server 100.
The server 100 in the embodiment of the present invention is mainly used for:
acquiring a formation relation of perforation explosion energy in a shaft, and establishing an equivalent energy model of perforation release into the shaft;
establishing a finite element calculation model corresponding to a perforating bullet in the perforating gun according to the equivalent energy model;
extracting energy simulation data corresponding to different moments based on the finite element model;
and determining the proportion of the perforation residual energy in the final shaft according to the energy simulation data.
In this embodiment of the present invention, the server 100 may be an independent server, or may be a server network or a server cluster composed of servers, for example, the server 100 described in this embodiment of the present invention includes, but is not limited to, a computer, a network host, a single network server, a plurality of network server sets, or a cloud server composed of a plurality of servers. Among them, the Cloud server is constituted by a large number of computers or web servers based on Cloud Computing (Cloud Computing).
It is to be understood that the terminal 200 used in the embodiments of the present invention may be a device that includes both receiving and transmitting hardware, i.e., a device having receiving and transmitting hardware capable of performing two-way communication over a two-way communication link. Such a device may include: a cellular or other communication device having a single line display or a multi-line display or a cellular or other communication device without a multi-line display. The specific terminal 200 may be a desktop, a laptop, a web server, a Personal Digital Assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, a communication device, an embedded device, and the like, and the type of the terminal 200 is not limited in this embodiment.
It will be understood by those skilled in the art that the application environment shown in fig. 1 is only one application scenario of the present invention, and does not constitute a limitation on the application scenario of the present invention, and that other application environments may further include more or fewer terminals than those shown in fig. 1, for example, only 2 terminals are shown in fig. 1, and it is understood that the application system of the method for predicting the residual energy of a perforation explosion may further include one or more other terminals, and is not limited herein.
In addition, as shown in fig. 1, the application system of the method for predicting the residual energy of the perforation explosion may further include a memory 200 for storing data, such as an equivalent energy model, a finite element model, explosive energy data, jet energy data, and the like.
It should be noted that the scenario diagram of the application system of the method for predicting the residual energy of perforation explosion shown in fig. 1 is merely an example, the application system and the scenario of the method for predicting the residual energy of perforation explosion described in the embodiment of the present invention are for more clearly illustrating the technical solution of the embodiment of the present invention, and do not form a limitation on the technical solution provided in the embodiment of the present invention, and it is obvious to those skilled in the art that the technical solution provided in the embodiment of the present invention is also applicable to similar technical problems with the evolution of the application system of the method for predicting the residual energy of perforation explosion and the appearance of new business scenarios.
Referring to fig. 2, fig. 2 is a schematic flow chart of an embodiment of the method for predicting residual energy of perforating explosion provided by the present invention, where the method for predicting residual energy of perforating explosion includes steps S1 to S4, where:
in step S1, acquiring a formation relation of perforation explosion energy in the shaft, and establishing an equivalent energy model released into the shaft by perforation;
in step S2, establishing a finite element calculation model corresponding to the perforating charges in the perforating gun according to the equivalent energy model;
in step S3, extracting energy simulation data corresponding to different times based on the finite element model;
in step S4, a ratio of the final residual energy of the perforation in the wellbore is determined based on the energy simulation data.
In the embodiment of the invention, firstly, the formation relation of perforation explosion energy in a shaft is effectively obtained, and based on the formation relation, a theoretical model of residual energy equivalent explosive blocks of the perforation in the shaft, namely an equivalent energy model, is established, so that the condition of residual energy released into the shaft by perforation is fed back; then, establishing a finite element calculation model of the perforating charge in the perforating gun based on the equivalent energy model so as to carry out efficient simulation on the explosion process; further, according to the finite element calculation result, a formation process of the energy-gathering jet flow is obtained, explosive energy data and jet flow energy data at different times are extracted, and the perforation and explosion conditions in the shaft are reflected; and finally, predicting the residual energy of the perforation in the shaft through energy conversion analysis according to the explosive energy data and the jet flow energy data, and determining the proportion of the residual energy of the perforation in the shaft finally.
As a preferred embodiment, the composition relationship is expressed by the following formula:
Et＝Ej+Ew+El
wherein E istRepresenting the total explosive energy, E, of the chargejIndicating the energy required to form the jet, EwRepresenting wellbore perforation residual energy; elIndicating other lost energy from the perforating process.
In the embodiment of the invention, the total explosive energy of the charge of the perforating charge is effectively determined according to the energy required by jet formation, residual energy of shaft perforation and other lost energy in the perforation process, so that a corresponding composition relation is formed.
It should be noted that, referring to fig. 3, which is a schematic model diagram of an embodiment of the computational model of the perforating charges in the perforating gun provided by the present invention, the formation of the shaped jet is an extremely complex physical and chemical process, and the explosion generates local overpressure of several hundred or even several gigapascals within a delicate time scale. The jet penetrates the casing and formation while some energy is released into the wellbore. This energy is the primary source of wellbore safety threat and is affected by the type of perforating gun and other perforation conditions, where:
energy E required for jet formationjConsisting of the jet and slug kinetic energy, can be expressed as:
wherein m isjRepresents the mass of the jet in kg; v. ofjRepresents the velocity of the jet in m/s; m iscRepresents the mass of the pestle in kg; v. ofcRepresents the speed of the pestle body in m/s;
according to the theory of shaped jet formation, assuming that the liner collapses inward at a constant rate, the velocity and mass of the shaped jet and the pestle can be expressed as follows:
wherein, theta1A half angle representing the taper angle of the liner;
the crushing angle of the medicine type cover is shown, and the unit is degree; m is0The mass of the metal liner per unit length is expressed in kg; v. ofaThe collapse speed of the liner can be calculated by the following formula:
wherein D isbRepresenting the detonation velocity of the explosive of the perforating charge in m/s; mzRepresents the total mass of the charge of the perforating charge in kg; myThe total mass of the metal liner is expressed in kg;
the energy used by the perforations to form the jet is constant when the charge and gun type, charge and explosive type are determined. The energy released by the perforations into the wellbore can be determined, taking into account the energy loss, and can be expressed as:
wherein Q iszThe detonation heat of the charge is expressed in J/kg.
As a preferred embodiment, the equivalent energy model is represented by the following formula:
wherein, WeRepresenting the equivalent explosive mass, W representing the charge of the perforating charge,
indicating the rate of perforation energy remaining.
In the embodiment of the invention, the relation of the perforating explosion energy in the shaft is effectively determined, and a theoretical model of the perforating residual energy equivalent explosive block in the shaft is established. Wherein, when other energy losses of perforation are neglected,
as a preferred embodiment, referring to fig. 4, fig. 4 is a schematic flowchart of an embodiment of step S2 in fig. 2 provided by the present invention, where the step S2 includes steps S21 to S22, where:
in step S21, analyzing the composition of the perforation residual energy in the well bore according to the equivalent energy model;
in step S22, a three-dimensional physical model is created for the explosive charges in the perforating gun according to the composition of the residual energy of the perforation in the wellbore, and the corresponding finite element calculation model is formed.
In the embodiment of the invention, a finite element calculation model of the perforating charge in the perforating gun is established according to the theoretical model, and the establishment of the efficient finite element calculation model is carried out.
In a specific embodiment of the invention, a finite element calculation model of a perforating charge in a perforating gun is established, and the specific flow is as follows:
in the first step, as perforation research relates to multidisciplinary intersection, the energy conversion process of downhole perforation is difficult to be comprehensively analyzed by adopting a theoretical method at present. The indoor perforating bullet experiment method consumes large manpower and material resources, has high safety risk, and simultaneously, the existing measurement technology is difficult to capture real physical phenomena and comprehensively acquire dynamic data. Therefore, the study of perforations by finite element simulation methods is a choice of many researchers. Establishing a finite element calculation model aiming at a perforating bullet in a gun for further analyzing the energy conversion condition in the underground perforating process;
secondly, setting model parameters: the shaped charge cover of the perforating charge is made of red copper material and has the density of 8932kg/m3The taper angle is 46 degrees, the diameter is 36mm, the charging type is HMX, and the dosage is 45 g; the type number of the perforating gun is 127, the steel material is 32CrMo4, the size is 127/105mm, and the yield strength is 1038 MPa; the casing steel grade is N80, the size is 177.8/157.07mm, and the density is 7846kg/m3The yield strength is 758MPa, the elastic modulus is 206GPa, the shear modulus is 79.4GPa, and the Poisson ratio is 0.3; the annular liquid density is 1030kg/m3；
And thirdly, the materials in the model comprise a perforating bullet, a perforating gun and a sleeve, the perforating bullet comprises a bullet shell, a charge and a shaped charge cover, the perforating gun is filled with air, and the annular space is filled with liquid.
As a preferred embodiment, referring to fig. 5, fig. 5 is a schematic flowchart of an embodiment of step S3 in fig. 2 provided by the present invention, where the step S3 includes steps S31 to S32, where:
in step S31, performing finite element calculation based on the finite element model;
in step S32, explosive energy data and jet energy data corresponding to different times are extracted based on the finite element calculation result of the finite element model.
In the embodiment of the invention, according to the established calculation model, model parameters and state equations are set, finite element calculation is carried out, the formation process of the energy-gathered jet is obtained according to the finite element calculation result, and explosive and jet energy data at different moments are extracted.
As a preferred embodiment, referring to fig. 6, fig. 6 is a schematic flowchart of an embodiment of step S31 in fig. 5 provided by the present invention, where the step S31 includes steps S311 to S313, where:
in step S311, based on the finite element model, a corresponding grid model is established by using lagrange and euler algorithms;
in step S312, according to the mesh model, determining a corresponding state equation and material model parameters to form a complete model;
in step S313, the complete model is input in the form of a k-file, and numerical simulation calculation is performed to form the finite element calculation result.
In the embodiment of the invention, model parameters and state equations are set according to the established calculation model, and finite element calculation is carried out.
In one embodiment of the present invention, the finite element calculation is performed as follows:
firstly, establishing a grid model by using a Lagrange algorithm for a perforating bullet shell, a perforating gun and a casing; the liner, charge, air and liquid are modeled using the ALE algorithm. The key point during the division of the model grid is established in the fluid area grid, the effective transmission of the calculation process is ensured by adopting the common node on different area interfaces, and meanwhile, the size of the grid directly influences the numerical simulation calculation speed and precision. After a plurality of times of trial calculation, the average spacing of the model grids is between 0.5mm and 1.5 mm. The model contains 1658637 nodes in total, 1568726 units;
secondly, adopting a HIGH _ EXPLOSIVE _ BURN material model for HMX EXPLOSIVE, adopting a Johnson-Cook model for a perforating charge type cover model, adopting MAT _ NULL for annular liquid, and adopting an MAT _ NULL model for model air material;
thirdly, JWL equation of state is used for the HMX explosive, LINEAR _ POLYNOMIAL equation of state is used for air, and Gruneisen equation of state is used for fluid.
As a preferred embodiment, referring to fig. 7, fig. 7 is a schematic flowchart of an embodiment of step S32 in fig. 5 provided by the present invention, where the step S32 includes steps S321 to S322, where:
in step S321, a jet pressure cloud map of the energy-gathered jet forming process is obtained based on the finite element calculation result of the finite element model;
in step S322, the explosive energy data and the jet energy data corresponding to different times are extracted according to the jet pressure cloud chart.
In the embodiment of the invention, the energy-gathered jet forming process is obtained by combining the finite element calculation result, and the explosive and jet energy data at different moments are extracted.
In a specific embodiment of the present invention, a specific process for extracting the explosive and jet energy data at different times is as follows:
firstly, inputting a complete model in a k file form, wherein keywords are defined as follows: models for introduction of INCLUDE and INCLUDE transfer; INITIAL _ DETONATION defines the initiation point and initiation time of the explosive; ALE _ MULTIP-MATERIAL _ GROUP defines the mutual flow between the MATERIAL grids of the fluid region; the connected _ LAGRANGE _ IN _ SOLID defines fluid-SOLID coupled contacts; defining a grid unit algorithm by SECTION _ SOLID and SECTION _ SOLID _ ALE; CONTROL _ terminate and CONTROL _ time define the calculation time and time, and expand the numerical simulation calculation;
and secondly, according to the numerical simulation calculation result, the detonation effect can be generated instantly after the explosive is detonated, and the generated detonation product accelerates to drive the metal shaped charge cover to the symmetrical axis. As the liner unit bodies collide with each other at high speed near the axis, a wider low-speed pestle body and a thinner energy-gathered high-speed jet are formed. The local collision point pressure of the jet axis reaches 9250 MPa;
and thirdly, extracting the explosive and jet flow energy data at different moments, wherein the speed of the jet flow head can reach ten thousand meters per second, and the residual energy release process of shaft perforation is obviously lagged behind jet flow according to the energy conversion time sequence.
As a preferred embodiment, referring to fig. 8, fig. 8 is a schematic flowchart of an embodiment of step S4 in fig. 2 provided by the present invention, where the step S4 includes steps S41 to S42, where:
in step S41, determining a first difference value according to a difference between the corresponding explosive energy data and the corresponding jet energy data at different times;
in step S42, determining the ratio of the perforation residual energy in the final wellbore at different times according to the ratio of the first difference and the explosive energy data.
In the embodiment of the invention, the residual energy of the perforation in the shaft is predicted by energy conversion analysis according to the explosive and jet flow energy data, and the proportion of the final residual energy of the perforation in the shaft is determined.
In one embodiment of the present invention, the specific process for determining the ratio of the perforation residual energies in the final wellbore is as follows:
firstly, an energy conversion relation shows that residual energy of a perforation in a shaft is mainly composed of explosion energy and dynamic pressure wave energy generated by explosive products;
secondly, according to an energy equivalent theory, defining the mass of a single spherical explosive as the explosive equivalent explosive charge mass of the residual energy of perforation in the shaft, and adopting the following formula:
wherein, WeIs the equivalent explosive mass; w is the charge of the perforating bullet;
the residual rate of the perforation energy is;
and thirdly, based on the numerical simulation result, by extracting the explosive and the jet flow energy data at different moments, the total energy of the explosive is about 2.55MJ, and the jet flow energy data is about 1.484 MJ. Because the speed of the jet flow head can reach ten thousand meters per second, the release process of the residual energy of the jet hole of the shaft is obviously lagged behind the jet flow according to the energy conversion time sequence. Because the dynamic shock wave of the perforation in the shaft is the focus of attention, the time of the jet flow process is very short, and the residual energy of the perforation explosion in the shaft is irrelevant to jet flow, a perforation cartridge case and other energy losses. The composition of the residual energy of the perforation can be calculated by the following formula:
η＝(2.55-1.484)/2.55＝0.418
it should be noted that, according to the finite element calculation result, a pressure cloud chart of the energy-gathered jet forming process is obtained, and as seen in fig. 9, fig. 9 is a schematic diagram of an embodiment of the energy-gathered jet pressure obtained by numerical simulation provided by the present invention, and for conveniently observing the jet forming process, the shaped charge liner is selected at the time of 10 μ s, 20 μ s, 30 μ s, and 40 μ s to form a jet pressure graph. As can be seen, firstly, after the explosive is detonated, the detonation action can be generated instantly, and the generated detonation product accelerates to drive the metal shaped charge cover to the symmetry axis. Because the liner unit bodies collide with each other at high speed near the axis, a wider low-speed pestle body and a thinner energy-gathered high-speed jet are formed. At 20 mus, the jet flow is basically formed, and the pressure of the local collision point of the axis reaches 9250 MPa;
based on the numerical simulation result, by extracting the explosive and jet energy data at different times, the total energy of the explosive is about 2.55MJ, and the jet energy data is about 1.484 MJ. Because the speed of the jet flow head can reach ten thousand meters per second, the release process of the residual energy of the jet hole of the shaft is obviously lagged behind the jet flow according to the energy conversion time sequence. Because the dynamic shock wave of the perforation in the shaft is the focus of attention, the time of the jet flow process is very short, and the residual energy of the perforation explosion in the shaft is irrelevant to jet flow, a perforation cartridge case and other energy losses. Predicting residual energy of perforation in a shaft, and determining the proportion of the final residual energy of perforation in the shaft, wherein the related data are shown in the following table 1:
TABLE 1
| Serial number | 1 | 2 | 3 | 4 | 5 | 6 |
| Value taking | 0.405 | 0.418 | 0.425 | 0.423 | 0.467 | 0.417 |
An embodiment of the present invention further provides an apparatus for predicting residual energy of perforation explosion, and referring to fig. 10, fig. 10 is a block diagram of an apparatus for predicting residual energy of perforation explosion according to an embodiment of the present invention, where the apparatus 1000 for predicting residual energy of perforation explosion includes:
the acquiring unit 1001 is used for acquiring a formation relation of perforation explosion energy in a shaft and establishing an equivalent energy model released into the shaft by a perforation;
the processing unit 1002 is configured to establish a finite element calculation model corresponding to a perforating bullet in the perforating gun according to the equivalent energy model; the energy simulation system is also used for extracting energy simulation data corresponding to different moments based on the finite element model;
and the prediction unit 1003 is used for determining the proportion of the perforation residual energy in the final shaft according to the energy simulation data.
The device for predicting the residual energy of the perforating explosion provided by the above embodiment of the invention can be implemented by referring to the content specifically described in the method for predicting the residual energy of the perforating explosion according to the invention, and has similar beneficial effects to the method for predicting the residual energy of the perforating explosion described above, and the details are not repeated here.
Embodiments of the present invention also provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of predicting remaining energy of a perforating explosion as described above.
Generally, computer instructions for carrying out the methods of the present invention may be carried using any combination of one or more computer-readable storage media. Non-transitory computer readable storage media may include any computer readable medium except for the signal itself, which is temporarily propagating.
A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + +, and conventional procedural programming languages, such as the "C" programming language or similar programming languages, and in particular may employ Python languages suitable for neural network computing and TensorFlow, PyTorch, and like platform frameworks. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
Embodiments of the present invention also provide a computing device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the processor implements the method for predicting the residual energy of the perforation explosion as described above.
The computer-readable storage medium and the computing device provided according to the above embodiments of the present invention can be implemented by referring to the contents specifically described in the method for implementing the method for predicting the residual energy of a perforating explosion as described above according to the present invention, and have similar beneficial effects to the method for predicting the residual energy of a perforating explosion as described above, and will not be described in detail herein.
The invention discloses a method, a device and a storage medium for predicting residual energy of perforation explosion, wherein firstly, a formation relation of the perforation explosion energy in a shaft is effectively obtained, and based on the formation relation, a theoretical model of an equivalent explosive block of the residual energy of the perforation in the shaft, namely an equivalent energy model, is established, so that the condition of the residual energy released into the shaft by perforation is fed back; then, establishing a finite element calculation model of the perforating charge in the perforating gun based on the equivalent energy model so as to carry out efficient simulation on the explosion process; further, according to the finite element calculation result, an energy-gathered jet forming process is obtained, explosive energy data and jet energy data at different moments are extracted, and the explosion condition of a jet hole in the shaft is reflected; and finally, predicting the residual energy of the perforation in the shaft through energy conversion analysis according to the explosive energy data and the jet flow energy data, and determining the proportion of the residual energy of the perforation in the shaft finally.
The technical scheme of the invention provides the method for determining the residual energy of perforation explosion in the shaft by meeting the actual explosion conditions of the perforating charge on site, greatly improves the accuracy of predicting the residual energy of perforation explosion in the shaft, and can scientifically provide theoretical basis for the optimization design of site perforation.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention.
Claims (10)
1. A method of predicting the residual energy of a perforating explosion, comprising:
acquiring a formation relation of perforation explosion energy in a shaft, and establishing an equivalent energy model released into the shaft by perforation;
establishing a finite element calculation model corresponding to a perforating bullet in the perforating gun according to the equivalent energy model;
extracting energy simulation data corresponding to different moments based on the finite element model;
and determining the proportion of the perforation residual energy in the final shaft according to the energy simulation data.
2. The method of predicting perforating detonation remaining energy as recited in claim 1 wherein said constitutive relation is represented by the following formula:
Et＝Ej+Ew+El
wherein E istRepresenting the total explosive energy, E, of the chargejIndicating the energy required to form the jet, EwRepresenting wellbore perforation residual energy; elIndicating other lost energy from the perforating process.
3. The method of predicting perforating detonation remaining energy as recited in claim 1 wherein said equivalent energy model is represented by the formula:
wherein, WeRepresenting the equivalent explosive mass, W representing the charge of the perforating charge,
representing the rate of perforation energy remaining.
4. The method of predicting residual energy from a perforating explosion as recited in claim 1, wherein said modeling finite element calculations corresponding to the charges in the perforating gun based on the equivalent energy model comprises:
analyzing the composition of residual energy of perforation in the shaft according to the equivalent energy model;
and establishing a three-dimensional physical model aiming at the explosive charge of the perforating charge in the perforating gun according to the composition of the perforating residual energy in the shaft, and forming the corresponding finite element calculation model.
5. The method of predicting residual energy in perforating shots as claimed in claim 1 wherein said energy simulation data comprises explosive energy data and jet energy data and said extracting energy simulation data corresponding to different times based on said finite element model comprises:
performing finite element calculation based on the finite element model;
and extracting the explosive energy data and the jet flow energy data corresponding to different moments based on the finite element calculation result of the finite element model.
6. The method for predicting residual energy of perforation explosions as defined in claim 5, wherein said performing finite element calculations based on said finite element model comprises:
establishing a corresponding grid model by adopting Lagrange and Euler algorithms based on the finite element model;
determining corresponding state equations and material model parameters according to the grid model to form a complete model;
and inputting the complete model in a k file form, and developing numerical simulation calculation to form the finite element calculation result.
7. The method for predicting the residual energy of perforating explosion according to claim 5, wherein the extracting of the explosive energy data and the jet energy data corresponding to different moments based on the finite element calculation result of the finite element model comprises:
obtaining a jet pressure cloud chart in the formation process of the energy-gathered jet based on the finite element calculation result of the finite element model;
and extracting the explosive energy data and the jet flow energy data corresponding to different moments according to the jet flow pressure cloud picture.
8. The method of predicting perforating detonation residual energy as defined in claim 1, said energy simulation data comprising explosive energy data and jet energy data, said determining a proportion of final perforating residual energy in the wellbore from said energy simulation data comprising:
determining a first difference value according to the difference between the explosive energy data and the jet flow energy data corresponding to different moments;
and determining the proportion of the perforation residual energy in the final shaft corresponding to different moments according to the proportion of the first difference value and the explosive energy data.
9. An apparatus for predicting the residual energy of a perforating explosion, comprising:
the acquiring unit is used for acquiring the formation relation of perforation explosion energy in the shaft and establishing an equivalent energy model released into the shaft by perforation;
the processing unit is used for establishing a finite element calculation model corresponding to the perforating charge in the perforating gun according to the equivalent energy model; the energy simulation system is also used for extracting energy simulation data corresponding to different moments based on the finite element model;
and the prediction unit is used for determining the proportion of the perforation residual energy in the final shaft according to the energy simulation data.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out a method of predicting the residual energy of a perforating explosion as claimed in any one of claims 1 to 8.
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