CN110874513B - Design method and device for gas injection hole of gas-liquid mixer - Google Patents
Design method and device for gas injection hole of gas-liquid mixer Download PDFInfo
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Abstract
The invention discloses a design method and a device for a gas injection hole of a gas-liquid mixer, comprising the following steps: establishing a finite element analysis model formed by a gas-liquid mixer core tube, a core tube outer annular space and a core tube inner annular space in the underground, wherein the gas-liquid mixer core tube isolates outer annular space gas and inner annular space liquid; creating and obtaining a finite element calculation model according to the finite element analysis model; and solving the finite element calculation model, and determining the design scheme of the gas injection hole according to a solving result, wherein the solving result comprises a return speed, pressure, wall speed and pressure flow field distribution rule. The invention realizes the simple and accurate purpose of the design method of the gas injection hole.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas drilling equipment, in particular to a design method and a design device for a gas injection hole of a reverse circulation gas-liquid mixer for drilling.
Background
The gas lift reverse circulation drilling technology utilizes the working principle of a gas lift pump, namely, compressed air is used as power, so that the gas lift reverse circulation drilling technology is mixed with flushing fluid in a drill rod and expands to apply work, a low-density gas-liquid mixture is formed, pressure difference is generated between the inner liquid column and the outer liquid column of the drill rod, reverse circulation drilling technology of flushing fluid carrying rock debris from the inner cavity of the drill rod is realized under the action of the pressure difference, and high-speed drilling, slowing down or thoroughly eliminating lost circulation can be realized. The technology is widely applied to hydrogeological exploration, large-caliber foundation pile holes, well and geothermal well drilling construction.
The gas-liquid mixer is an extremely important part in the gas-lift reverse circulation drilling equipment, the core of the gas-lift reverse circulation gas-liquid mixer is the structural design of gas injection holes, and the effect of the layout of the gas injection holes is related to the well bottom cleaning degree and the rock debris conveying effect, and also affects the rock breaking effect of a well bottom drill bit.
Often the design of the parameters of the gas injection holes is based mainly on extensive processing experience or complex pure theoretical analysis, but this approach is not suitable for the average designer. With the development of computational fluid dynamics, the advantage of solving a complex flow problem by using a computer is more and more remarkable, and therefore, a simple and accurate design method of a gas injection hole suitable for a person of ordinary skill in the art has become an important research point in the art.
Disclosure of Invention
Aiming at the problems, the invention provides a design method and a device for a gas injection hole of a gas-liquid mixer, which realize the purposes of simplicity and accuracy of the design method for the gas injection hole.
In order to achieve the above object, the present invention provides the following technical solutions:
a design method of a gas injection hole of a gas-liquid mixer comprises the following steps:
establishing a finite element analysis model formed by a gas-liquid mixer core tube, a core tube outer annular space and a core tube inner annular space in the underground, wherein the gas-liquid mixer core tube isolates outer annular space gas and inner annular space liquid;
creating and obtaining a finite element calculation model according to the finite element analysis model;
and solving the finite element calculation model, and determining the design scheme of the gas injection hole according to a solving result, wherein the solving result comprises a return speed, pressure, wall speed and pressure flow field distribution rule.
Optionally, the creating the finite element calculation model according to the finite element analysis model includes:
defining and obtaining physical parameters of each calculation domain of the finite element analysis model;
performing grid division on the finite element analysis model to obtain finite element grid units;
respectively establishing boundary conditions of inlet flow velocity, outlet pressure, turbulence intensity and hydraulic diameter in the finite element analysis model according to the physical parameters;
and creating and obtaining a finite element calculation model according to the boundary conditions and the finite element grid cells.
Optionally, the solving the finite element calculation model, and determining the design scheme of the gas injection hole according to the solving result, includes:
solving the finite element calculation model to obtain an aperture combination mode, an aperture inclination angle and a hole distance;
and determining the design scheme of the gas injection hole according to the aperture combination mode, the aperture inclination angle and the aperture distance.
Optionally, the solving the finite element calculation model to obtain an aperture combination mode, an aperture inclination angle and a pitch comprises:
calculating to obtain the distribution rule of the speed and the pressure under the combination condition of different hole diameters in the allowable aperture range of the finite element calculation model, and determining an aperture combination mode meeting a first preset condition, wherein the first preset condition comprises that the upward speed is highest and the pressure gradient is most obvious;
calculating to obtain the distribution rule of the hole speed and the wall pressure under different inclination angles within the allowable inclination angle range of the gas injection hole of the finite element calculation model, and determining the hole inclination angle meeting a second preset condition, wherein the second preset condition comprises that the wall erosion risk is the lowest;
and calculating to obtain internal upward velocity distribution rules under different hole distances in the allowable hole distance range of the finite element calculation model, and determining the hole distance meeting a third preset condition, wherein the third preset condition comprises highest rock debris migration efficiency.
Optionally, before building the downhole finite element analysis model formed by the gas-liquid mixer core tube, the core tube outer annulus and the core tube inner annulus, the method further comprises:
and (3) establishing a three-dimensional geometric model formed by the outer annular gas, the inner annular liquid and the gas-liquid mixer core tube according to the size of the API drilling tool actually adopted.
A gas injection hole design device for a gas-liquid mixer, comprising:
the device comprises a building unit, a control unit and a control unit, wherein the building unit is used for building a finite element analysis model which is formed by a gas-liquid mixer core tube, a core tube outer annular space and a core tube inner annular space in the pit, wherein the gas-liquid mixer core tube isolates outer annular space gas and inner annular space liquid;
the creation unit is used for creating and obtaining a finite element calculation model according to the finite element analysis model;
and the solving unit is used for solving the finite element calculation model and determining the design scheme of the gas injection hole according to the solving result, wherein the solving result comprises the upward velocity, the pressure, the wall surface velocity and the pressure flow field distribution rule.
Optionally, the creating unit includes:
a definition subunit, configured to define and obtain physical property parameters of each calculation domain of the finite element analysis model;
the dividing subunit is used for carrying out grid division on the finite element analysis model to obtain finite element grid units;
establishing subunits, which are used for respectively establishing boundary conditions of inlet flow velocity, outlet pressure, turbulence intensity and hydraulic diameter in the finite element analysis model according to the physical parameters;
and the creation subunit is used for creating and obtaining a finite element calculation model according to the boundary conditions and the finite element grid unit.
Optionally, the solving unit includes:
the solving subunit is used for solving the finite element calculation model to obtain an aperture combination mode, an aperture inclination angle and a hole pitch;
and the determining subunit is used for determining the design scheme of the gas injection hole according to the aperture combination mode, the aperture inclination angle and the aperture distance.
Optionally, the solving subunit includes:
the first calculation subunit is used for calculating and obtaining the distribution rule of the speed and the pressure under the combination condition of different hole diameters in the allowable aperture range of the finite element calculation model, and determining an aperture combination mode meeting a first preset condition, wherein the first preset condition comprises that the upward speed is highest and the pressure gradient is most obvious;
the second calculating subunit is used for calculating and obtaining distribution rules of the hole speed and the wall surface pressure under different inclination angles within the allowable inclination angle range of the gas injection hole of the finite element calculation model, and determining the hole inclination angle meeting a second preset condition, wherein the second preset condition comprises that the wall surface erosion risk is the lowest;
and the third calculation subunit is used for calculating and obtaining internal upward velocity distribution rules under different hole distances within the allowable hole distance range of the finite element calculation model, and determining the hole distance meeting a third preset condition, wherein the third preset condition comprises highest rock debris migration efficiency.
Optionally, the method further comprises:
the geometric model building unit is used for building a three-dimensional geometric model formed by the outer annular gas, the inner annular liquid and the gas-liquid mixer core tube according to the size of the API drilling tool actually adopted.
Compared with the prior art, the invention provides a design method and a device for a gas-liquid mixing gas injection hole, which are characterized in that a finite element analysis model formed by a gas-liquid mixer core pipe, a core pipe outer annular space and a core pipe inner annular space is built underground, a finite element calculation model is built based on the finite element analysis model by considering parameters such as the diameter, the angle, the pitch and the like of the gas injection hole, and the calculation model is solved to obtain the distribution rule of the upward velocity, the pressure, the wall velocity and the pressure flow field, so that the design scheme of the gas injection hole can be obtained.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a design method of a gas injection hole of a gas-liquid mixer according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a finite element computing model creation method according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of another design method for a gas injection hole of a gas-liquid mixer according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a gas injection hole design device of a gas-liquid mixer according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms first and second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to the listed steps or elements but may include steps or elements not expressly listed.
In an embodiment of the present invention, a method for designing a gas injection hole of a gas-liquid mixer is provided, referring to fig. 1, the method includes the following steps:
s11, establishing a finite element analysis model formed by a gas-liquid mixer core tube, a core tube outer annular space and a core tube inner annular space in the underground;
wherein the gas-liquid mixer core tube isolates the outer annular gas and the inner annular liquid.
Before the finite element analysis model is built, a three-dimensional geometric unit is required to be built, namely, the three-dimensional geometric unit formed by an outer annular gas, an inner annular liquid and a gas-liquid mixer core tube is built according to the size of a drilling tool provided by an API (American Petroleum Institute ) standard. The gas-liquid mixer core tube gas injection holes are circumferentially and axially provided with 8 x 8 = 64 circular water holes and water holes with other shapes, the aperture is 5-10mm, the inclination angle is 0-30 degrees, and the hole distance is 10-40mm.
S12, creating and obtaining a finite element calculation model according to the finite element analysis model;
after the finite element analysis model is obtained, to facilitate the transformation of the solution to the model into a finite element computation model, see fig. 2, the creation of the finite element computation model may comprise the steps of:
s121, defining and obtaining physical parameters of each calculation domain of the finite element analysis model;
s122, carrying out grid division on the finite element analysis model to obtain finite element grid units;
s123, respectively establishing boundary conditions of inlet flow velocity, outlet pressure, turbulence intensity and hydraulic diameter in the finite element analysis model according to the physical parameters;
s124, creating and obtaining a finite element calculation model according to the boundary conditions and the finite element grid cells.
Specifically, defining physical parameters of each calculation domain of a finite element analysis model, carrying out grid division on the finite element analysis model to obtain finite element grid units, and then respectively establishing boundary conditions such as inlet flow rate, outlet pressure, turbulence intensity, hydraulic diameter and the like of the finite element analysis model according to the physical parameters; and a steady-state k-e turbulence calculation method is adopted, and parameters such as the diameter, the angle, the pitch and the like of gas injection holes which are closely related to the gas lift sub-circulation gas injection process are considered, so that a finite element calculation model is established.
And S13, solving the finite element calculation model, and determining the design scheme of the gas injection hole according to a solving result, wherein the solving result comprises a return speed, pressure, wall speed and pressure flow field distribution rule.
Solving the finite element calculation model to obtain an aperture combination mode, an aperture inclination angle and a hole distance; and determining the design scheme of the gas injection hole according to the aperture combination mode, the aperture inclination angle and the aperture distance. The solving process may specifically include:
calculating to obtain the distribution rule of the speed and the pressure under the combination condition of different hole diameters in the allowable aperture range of the finite element calculation model, and determining an aperture combination mode meeting a first preset condition, wherein the first preset condition comprises that the upward speed is highest and the pressure gradient is most obvious;
calculating to obtain the distribution rule of the hole speed and the wall pressure under different inclination angles within the allowable inclination angle range of the gas injection hole of the finite element calculation model, and determining the hole inclination angle meeting a second preset condition, wherein the second preset condition comprises that the wall erosion risk is the lowest;
and calculating to obtain internal upward velocity distribution rules under different hole distances in the allowable hole distance range of the finite element calculation model, and determining the hole distance meeting a third preset condition, wherein the third preset condition comprises highest rock debris migration efficiency.
For example, the process of solving the finite element computing model can be converted into three parts. In a range of pore diameters of 5-10mm of gas injection holes allowed in a finite element analysis model, calculating speed, pressure and other distribution rules under the condition of 10mm x 64 and (5+6+7+8) mm x 16 equal different pore diameters, and determining an optimal pore diameter combination mode with highest upward speed and obvious pressure gradient;
in a range of allowing the inclination angle of the gas injection hole to be 0-30 degrees in a finite element analysis model, calculating distribution rules such as the hole speed, the wall pressure and the like under different inclination angles such as 0 degrees, 10 degrees, 20 degrees, 30 degrees and the like, and determining an optimal hole inclination angle which meets the minimum risk of wall erosion;
and calculating internal upward velocity distribution rules under the conditions of different hole distances of 5mm, 10mm, 15mm, 20mm and 25mm in the range of 5-25 mm gas injection hole distances allowed in the finite element analysis model, and determining the optimal hole distance meeting the highest rock debris migration efficiency.
According to the calculation results of the flow field distribution rules such as the upward velocity, the pressure, the avoidance velocity and the pressure obtained by the finite element calculation model, the setting mode of the optimal gas injection holes is defined, the diameter combinations of the optimal gas injection holes are designed to be (5+6+7+8) mm 16, the inclination angle is 10 degrees, the hole pitch is 20mm, and the optimal gas injection effect of the reverse circulation gas-liquid mixer can be realized.
The invention provides a design method of a gas-liquid mixing gas injection hole, which is characterized in that a finite element analysis model formed by a gas-liquid mixer core pipe, a core pipe outer annular space and a core pipe inner annular space is built underground, a finite element calculation model is built on the basis of the finite element analysis model by considering parameters such as the diameter, the angle, the pitch and the like of the gas injection hole, the calculation model is solved to obtain the distribution rule of a return speed, pressure, wall speed and a pressure flow field, so that the design scheme of the gas injection hole can be obtained, and the design experience and theoretical analysis are not needed because the analysis and calculation based on the model in the determination process of the design scheme, so that the simple and accurate gas injection hole design method is formed.
In the embodiment of the invention, another design method of the gas injection hole of the gas-liquid mixer is also provided, referring to fig. 3, comprising the following steps:
s301, establishing a three-dimensional geometric model in a finite element analysis model formed by a gas-liquid mixer core tube, a core tube outer annular space and a core tube inner annular space in the pit;
s302, defining physical parameters of each calculation domain of a finite element analysis model;
s303, carrying out grid division on the three-dimensional geometric model to obtain finite element grid units;
s304, respectively establishing boundary conditions such as inlet flow rate, outlet pressure, turbulence intensity, force diameter and the like according to physical parameters;
s305, establishing a finite element calculation model by adopting a steady-state k-e turbulence method, and obtaining an internal flow field distribution cloud image under the condition of a finite element analysis model;
s306, calculating to obtain an optimal aperture combination mode;
changing the pore size of the gas injection hole of the finite element analysis model, wherein the pore size range is 5-10mm, fixing the inclination angle and the pitch of the gas injection hole, repeating the steps S301-S305, and calculating the internal flow field distribution comprising equal diameters and unequal combined modes in the pore size range to obtain the optimal pore size combination mode of (5+6+7+8 mm) multiplied by 16.
S307, calculating to obtain an optimal inclination angle;
changing the inclination angle of the gas injection hole of the finite element analysis model, wherein the inclination angle range is 0-30 degrees, fixing the aperture and the pitch of the gas injection hole, repeating the steps S301-S305, calculating the flow field distribution in the inclination angle range, and obtaining the optimal inclination angle of 10 degrees.
S308, calculating to obtain the optimal distance;
and changing a finite element analysis model, wherein the pitch range is 5-25 mm, fixing the aperture and the inclination angle of the gas injection hole, repeating the steps S301-S305, and calculating the internal flow field distribution under different pitch conditions to obtain the optimal pitch of 20mm.
According to finite element analysis and calculation, internal flow field distribution is obtained, and uniform pressure fields and microbubbles can be formed under the conditions of pore diameters (5+6+7+8 mm) x 16, inclination angles of 10 degrees and intervals of 20mm, so that more laughing rock debris migration speed and well bottom cleaning effect are achieved.
Of course, when the boundary condition is changed, the design result described in the embodiment of the present invention is not limited to the above calculation result, and the setting mode of the optimal gas injection hole can be obtained only by adopting the above design method.
The principle process or steps of designing the gas injection hole of the gas-filled reverse circulation gas-liquid mixer can be seen by the embodiment as follows: establishing a finite element analysis model consisting of a three-dimensional geometric unit, physical parameters, a grid unit and boundary conditions of the gas-liquid mixer; and (3) adopting a steady-state k-e turbulence calculation method, taking parameters such as the diameter, the angle, the pitch and the like of the gas injection holes closely related to the reverse circulation gas injection process into consideration, establishing a finite element calculation model, and calculating to obtain internal flow field distribution rules under different conditions, thereby optimally designing the optimal gas injection hole parameters.
The embodiment of the invention also provides a gas injection hole design device of the gas-liquid mixer, which comprises the following components with reference to fig. 4:
the establishing unit 10 is used for establishing a downhole finite element analysis model formed by a gas-liquid mixer core tube, a core tube outer annular space and a core tube inner annular space, wherein the gas-liquid mixer core tube isolates outer annular space gas and inner annular space liquid;
a creating unit 20 for creating an obtained finite element calculation model from the finite element analysis model;
and the solving unit 30 is used for solving the finite element calculation model and determining the design scheme of the gas injection hole according to the solving result, wherein the solving result comprises the upward velocity, the pressure, the wall surface velocity and the pressure flow field distribution rule.
The invention provides a gas-liquid mixing gas injection hole design device, which is characterized in that a finite element analysis model formed by a gas-liquid mixer core pipe, a core pipe outer annular space and a core pipe inner annular space is built in a building unit through a building unit, a finite element calculation model is built in the building unit based on the finite element analysis model by considering parameters such as the diameter, the angle, the pitch and the like of the gas injection hole, the calculation model is solved in a solving unit to obtain the distribution rule of the upward velocity, the pressure, the wall velocity and the pressure flow field, so that the design scheme of the gas injection hole can be obtained, and the design scheme is determined based on the analysis and calculation of the model without design experience and theoretical analysis.
On the basis of the above embodiment, optionally, the creating unit includes:
a definition subunit, configured to define and obtain physical property parameters of each calculation domain of the finite element analysis model;
the dividing subunit is used for carrying out grid division on the finite element analysis model to obtain finite element grid units;
establishing subunits, which are used for respectively establishing boundary conditions of inlet flow velocity, outlet pressure, turbulence intensity and hydraulic diameter in the finite element analysis model according to the physical parameters;
and the creation subunit is used for creating and obtaining a finite element calculation model according to the boundary conditions and the finite element grid unit.
Optionally, the solving unit includes:
the solving subunit is used for solving the finite element calculation model to obtain an aperture combination mode, an aperture inclination angle and a hole pitch;
and the determining subunit is used for determining the design scheme of the gas injection hole according to the aperture combination mode, the aperture inclination angle and the aperture distance.
Optionally, the solving subunit includes:
the first calculation subunit is used for calculating and obtaining the distribution rule of the speed and the pressure under the combination condition of different hole diameters in the allowable aperture range of the finite element calculation model, and determining an aperture combination mode meeting a first preset condition, wherein the first preset condition comprises that the upward speed is highest and the pressure gradient is most obvious;
the second calculating subunit is used for calculating and obtaining distribution rules of the hole speed and the wall surface pressure under different inclination angles within the allowable inclination angle range of the gas injection hole of the finite element calculation model, and determining the hole inclination angle meeting a second preset condition, wherein the second preset condition comprises that the wall surface erosion risk is the lowest;
and the third calculation subunit is used for calculating and obtaining internal upward velocity distribution rules under different hole distances within the allowable hole distance range of the finite element calculation model, and determining the hole distance meeting a third preset condition, wherein the third preset condition comprises highest rock debris migration efficiency.
Optionally, the method further comprises:
the geometric model building unit is used for building a three-dimensional geometric model formed by the outer annular gas, the inner annular liquid and the gas-liquid mixer core tube according to the size of the API drilling tool actually adopted.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The design method of the gas injection hole of the gas-liquid mixer is characterized in that the gas-liquid mixer is a reverse circulation gas-liquid mixer for drilling, and comprises the following steps:
establishing a finite element analysis model formed by a gas-liquid mixer core tube, a core tube outer annular space and a core tube inner annular space in the underground, wherein the gas-liquid mixer core tube isolates outer annular space gas and inner annular space liquid;
creating and obtaining a finite element calculation model according to the finite element analysis model;
solving the finite element calculation model, and determining the design scheme of the gas injection hole according to a solving result, wherein the solving result comprises a return speed, pressure, wall speed and pressure flow field distribution rule;
the method for solving the finite element calculation model and determining the design scheme of the gas injection hole according to the solving result comprises the following steps:
calculating to obtain the distribution rule of the speed and the pressure under the combination condition of different hole diameters in the allowable aperture range of the finite element calculation model, and determining an aperture combination mode meeting a first preset condition, wherein the first preset condition comprises that the upward speed is highest and the pressure gradient is most obvious;
calculating to obtain the distribution rule of the hole speed and the wall pressure under different inclination angles within the allowable inclination angle range of the gas injection hole of the finite element calculation model, and determining the hole inclination angle meeting a second preset condition, wherein the second preset condition comprises that the wall erosion risk is the lowest;
calculating to obtain internal upward velocity distribution rules under different hole distances within the allowable hole distance range of the finite element calculation model, and determining hole distances meeting a third preset condition, wherein the third preset condition comprises highest rock debris migration efficiency;
and determining the design scheme of the gas injection hole according to the aperture combination mode, the aperture inclination angle and the aperture distance which meet the conditions.
2. The method of claim 1, wherein creating the obtained finite element calculation model from the finite element analysis model comprises:
defining and obtaining physical parameters of each calculation domain of the finite element analysis model;
performing grid division on the finite element analysis model to obtain finite element grid units;
respectively establishing boundary conditions of inlet flow velocity, outlet pressure, turbulence intensity and hydraulic diameter in the finite element analysis model according to the physical parameters;
and creating and obtaining a finite element calculation model according to the boundary conditions and the finite element grid cells.
3. The method of claim 1, further comprising, prior to establishing the downhole finite element analysis model of the gas-liquid mixer core tube, the outer core tube annulus, and the inner core tube annulus:
and (3) establishing a three-dimensional geometric model formed by the outer annular gas, the inner annular liquid and the gas-liquid mixer core tube according to the size of the API drilling tool actually adopted.
4. The utility model provides a gas-liquid mixer gas injection hole design device which characterized in that, the gas-liquid mixer is reverse circulation gas-liquid mixer for the well drilling, includes:
the device comprises a building unit, a control unit and a control unit, wherein the building unit is used for building a finite element analysis model which is formed by a gas-liquid mixer core tube, a core tube outer annular space and a core tube inner annular space in the pit, wherein the gas-liquid mixer core tube isolates outer annular space gas and inner annular space liquid;
the creation unit is used for creating and obtaining a finite element calculation model according to the finite element analysis model;
the solving unit is used for solving the finite element calculation model and determining the design scheme of the gas injection hole according to a solving result, wherein the solving result comprises a return speed, pressure, wall speed and pressure flow field distribution rule;
the solving unit includes:
the first calculation subunit is used for calculating and obtaining the distribution rule of the speed and the pressure under the combination condition of different hole diameters in the allowable aperture range of the finite element calculation model, and determining an aperture combination mode meeting a first preset condition, wherein the first preset condition comprises that the upward speed is highest and the pressure gradient is most obvious;
the second calculating subunit is used for calculating and obtaining distribution rules of the hole speed and the wall surface pressure under different inclination angles within the allowable inclination angle range of the gas injection hole of the finite element calculation model, and determining the hole inclination angle meeting a second preset condition, wherein the second preset condition comprises that the wall surface erosion risk is the lowest;
a third calculation subunit, configured to calculate and obtain internal upward velocity distribution rules under different hole distances within a range of allowable hole distances of the finite element calculation model, and determine hole distances that satisfy a third preset condition, where the third preset condition includes highest rock debris migration efficiency;
and the determining subunit is used for determining the design scheme of the gas injection hole according to the aperture combination mode, the aperture inclination angle and the aperture distance.
5. The apparatus of claim 4, wherein the creating unit comprises:
a definition subunit, configured to define and obtain physical property parameters of each calculation domain of the finite element analysis model;
the dividing subunit is used for carrying out grid division on the finite element analysis model to obtain finite element grid units;
establishing subunits, which are used for respectively establishing boundary conditions of inlet flow velocity, outlet pressure, turbulence intensity and hydraulic diameter in the finite element analysis model according to the physical parameters;
and the creation subunit is used for creating and obtaining a finite element calculation model according to the boundary conditions and the finite element grid unit.
6. The apparatus as recited in claim 4, further comprising:
the geometric model building unit is used for building a three-dimensional geometric model formed by the outer annular gas, the inner annular liquid and the gas-liquid mixer core tube according to the size of the API drilling tool actually adopted.
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Citations (5)
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