CN117388113A - Shale gas associated helium content acquisition method, terminal and medium - Google Patents
Shale gas associated helium content acquisition method, terminal and medium Download PDFInfo
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- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 title claims abstract description 313
- 239000007789 gas Substances 0.000 title claims abstract description 290
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- 238000003795 desorption Methods 0.000 claims abstract description 228
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Abstract
The invention provides a shale gas associated helium content acquisition method, a terminal and a medium, wherein the method comprises the steps of firstly acquiring accumulated desorption gas and volume percentage of desorption helium measured by a desorption experiment at a plurality of moments; then, the cumulative residual gas volume and the residual helium volume percentage measured by the residual gas experiment at a plurality of moments are obtained; then calculating desorption helium information according to accumulated desorption gas and helium volume percentage at a plurality of moments; calculating residual helium information according to the accumulated residual gas and the residual helium volume percentage at a plurality of moments; and finally, calculating total helium information of the shale reservoir according to the desorption helium information and the residual helium information. The content of helium in shale gas in two phases is calculated by considering that helium in shale reservoir is mainly associated with shale gas in two phases of adsorption and dissociation, so that the accuracy of the content of the helium associated with shale gas is ensured.
Description
Technical Field
The invention belongs to the technical field of oil and gas exploration and development, and particularly relates to a shale gas associated helium content acquisition method, a terminal and a medium.
Background
Helium (He) is a scarce non-renewable resource, and is known as "gold gas" and "gaseous rare earth". Helium is the lowest melting and boiling known element and is an inert gas, which makes helium an irreplaceable role in a wide variety of high-precision technological fields such as aerospace, military, nuclear industry, superconducting physics, quantum computing, large accelerators, medical and integrated circuits. The development and utilization of shale gas associated helium are realized, the field of helium exploration and development can be expanded, and the realization of co-exploration and co-production of unconventional natural gas and rare gas is facilitated. The helium content of the shale reservoir is used as one of the most basic, most important, most core and most critical parameters of the shale gas associated helium research, and directly determines the helium resource amount and the exploration and development prospect, so that the shale gas associated helium content is an indispensable research content for carrying out the operations such as shale gas associated helium resource evaluation, favorable layer selection, favorable zone selection, well position optimization, development design and the like.
At present, the helium content acquisition method mainly comprises a gas logging non-hydrocarbon detection method, a helium cause calculation method, a geological history analysis method, a core desorption gas test analysis method, a production well gas analysis method and the like. However, these methods generally do not consider the occurrence of helium in shale, diffusion fractionation effects, etc., and therefore the calculated helium content is inaccurate.
Disclosure of Invention
In view of the above, the invention provides a shale gas associated helium content acquisition method, a terminal and a medium, which aim to solve the problem of inaccurate calculated helium content in the prior art.
The first aspect of the embodiment of the invention provides a shale gas associated helium content acquisition method, which comprises the following steps:
acquiring the cumulative desorption gas volume and the volume percentage of the desorption helium measured by the desorption experiment at a plurality of moments;
acquiring the cumulative residual gas volume and the residual helium volume percentage measured by a residual gas experiment at a plurality of moments;
calculating desorption helium information according to accumulated desorption gas and helium volume percentage at a plurality of moments;
calculating residual helium information according to the accumulated residual gas and the residual helium volume percentage at a plurality of moments;
and calculating total helium information of the shale reservoir according to the desorption helium information and the residual helium information.
A second aspect of the embodiment of the present invention provides a shale gas associated helium content obtaining apparatus, including:
the first acquisition module is used for acquiring the cumulative desorption gas volume and the desorption helium volume percentage measured by the desorption experiment at a plurality of moments;
the second acquisition module is used for acquiring the cumulative residual gas volume and the residual helium volume percentage measured by the residual gas experiment at a plurality of moments;
the first calculation module is used for calculating desorption helium information according to the accumulated desorption gas volume and helium volume percentage at a plurality of moments;
the second calculation module is used for calculating residual helium information according to the accumulated residual gas volume and residual helium volume percentage at a plurality of moments;
and the helium calculating module is used for calculating total helium information of the shale reservoir according to the desorption helium information and the residual helium information.
A third aspect of an embodiment of the present invention provides a terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the shale gas associated helium content obtaining method of the first aspect as above when executing the computer program.
A fourth aspect of an embodiment of the present invention provides a computer readable storage medium storing a computer program which when executed by a processor performs the steps of the shale gas associated helium content obtaining method of the first aspect above.
According to the shale gas associated helium content acquisition method, terminal and medium provided by the embodiment of the invention, the cumulative desorption gas and the volume percentage of the desorption helium measured by the desorption experiment at a plurality of moments are firstly acquired; then, the cumulative residual gas volume and the residual helium volume percentage measured by the residual gas experiment at a plurality of moments are obtained; then calculating desorption helium information according to accumulated desorption gas and helium volume percentage at a plurality of moments; calculating residual helium information according to the accumulated residual gas and the residual helium volume percentage at a plurality of moments; and finally, calculating total helium information of the shale reservoir according to the desorption helium information and the residual helium information. The content of helium in shale gas in two phases is calculated by considering that helium in shale reservoir is mainly associated with shale gas in two phases of adsorption and dissociation, so that the accuracy of the content of the helium associated with shale gas is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an application scene diagram of a shale gas associated helium content acquisition method provided by an embodiment of the invention;
FIG. 2 is a flow chart of an implementation of a shale gas associated helium content acquisition method provided by an embodiment of the invention;
fig. 3 is a schematic structural diagram of a shale gas associated helium content obtaining device provided by an embodiment of the invention;
fig. 4 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
Fig. 1 is an application scenario diagram of a shale gas associated helium content obtaining method provided by an embodiment of the invention. As shown in fig. 1, in some embodiments, the system includes a data acquisition system 11 and a terminal 12.
The data acquisition system is used for acquiring data measured by a desorption experiment, a residual gas test experiment and the like in a test sample laboratory and sending the data to the terminal 12, the terminal 12 determines the total helium content of the shale reservoir according to the received data, and related personnel can check the helium content in a region to be mined on the terminal 12 so as to make a mining plan.
The helium content determination methods of the prior art generally suffer from the following drawbacks:
(1) The gas in the shale reservoir mainly consists of two phases of adsorption and dissociation, and the existing method does not consider the occurrence and associated characteristics of helium in the reservoir, so that the knowledge of the analysis result of the gas content in the reservoir is not comprehensive and deep enough;
(2) The existing method does not consider the difference of helium content test analysis results caused by the influence of helium diffusion effect, and the obtained test analysis data can only represent the helium content at the sampling moment, so that the knowledge of the helium content is incomplete, comprehensive and deep;
(3) The helium content parameters mainly obtained by the existing method are the relative content of helium in natural gas given in a percentage form, and the analysis of the absolute content of helium is less involved, so that the knowledge of the content of helium in a reservoir is not comprehensive enough;
(4) The existing method mainly obtains static parameters for evaluating the gas content of the reservoir, and lacks a dynamic process and analysis of the dynamic gas content;
(5) The existing method is mainly an analysis method of the gas content of the conventional natural gas, and a test analysis and acquisition method for the content of the shale gas and helium in the shale reservoir is not available;
(6) The existing method mainly obtains a single parameter of helium content, and other content and parameters related to the helium content, such as the gas content of natural gas, cannot be evaluated at the same time.
In view of this, the present invention is improved on the basis of conventional methods. Fig. 2 is a flowchart of an implementation of a shale gas associated helium content obtaining method according to an embodiment of the present invention. As shown in fig. 2, a shale gas associated helium content acquisition method is applied to the terminal 12 shown in fig. 1, and includes:
s210, acquiring cumulative desorption gas volumes and desorption helium volume percentages measured by a desorption experiment at a plurality of moments.
In the embodiment of the invention, in order to obtain high-precision original shale reservoir helium content information, a pressure-maintaining airtight coring technology with highest recognition degree and reliability at present is adopted to obtain a shale sample for shale gas on-site desorption experiments. Compared with the traditional rope coring technology, the pressure maintaining closed coring technology can be used for well preserving the original geological information such as the pressure, the gas content and the like in the shale sample before the shale sample is loaded into the desorption equipment, and omitting an estimation part of the gas loss in the subsequent desorption experimental data processing, so that the error of an experimental result is reduced. The amount of in-situ desorption obtained for the pressure maintaining closed coring sample can be considered to be equivalent to the amount of in-situ desorption for the sample of the conventional coring method plus the estimated amount of loss. Sampling is carried out by using pressure-maintaining coring equipment, and continuous and uniform sampling is carried out as much as possible in the drilling tool drilling lifting process, so that the error of a subsequent desorption experiment is reduced, and the coring quality is not lower than 1kg.
Before the shale gas on-site desorption experiment is carried out, the tightness of shale gas desorption equipment needs to be carefully checked, and whether heating equipment works well or not is judged. The gas in the sample desorption process is introduced into a gas chromatograph, and the shale gas desorption experiment is also carried outThe shale gas accumulated desorption volumes (t) i ，V SG desorption (t i ))(t i And V SG desorption (t i ) The units are min and cm respectively 3 ) Helium volume percent data (t i ，χ He desorption (t i ))(χ He desorption (t i ) Unit is%).
In the embodiment of the invention, after the field desorption experiment is finished, the aspects of color, structure, mineral composition, cementing agent, special sedimentation phenomenon and the like of the shale sample are described, and the basic characteristics of the rock mineralogy of the sample are mastered. Then, the petrophysical basic parameters of the analysis sample are tested and analyzed in time, and a residual gas amount test sample is prepared. Mass m of shale sample used in test field desorption experiment 1 (unit: g) and residual gas determination experiment sample mass m 2 (unit: g).
S220, the cumulative residual gas volume and the residual helium volume percentage measured by the residual gas experiment at a plurality of moments are obtained.
In the embodiment of the invention, the residual gas amount is considered to be mainly the adsorption gas which is not desorbed in the desorption stage, and the residual gas amount occupies a relatively small amount. Helium is extremely small in adsorption quantity in the shale reservoir, and the helium existing in the residual gas quantity testing stage comprises a part of small quantity of helium which is endowed in minerals. Before the shale gas residual capacity measurement experiment is carried out, the air tightness of related equipment needs to be carefully checked, and good conditions of a power supply and the like are ensured. The gas in the residual gas amount test process also needs to be introduced into a gas chromatograph and an isotope mass spectrometer, so that helium content and helium isotope data in the residual gas are obtained. Residual gas volume (t) obtained by shale gas cumulative test at different time points through residual gas measurement experiment i ，V SG residues (t i ))(t i And V SG residues (t i ) The units are min and cm respectively 3 ) Helium volume percent data (t i ，χ He residue (t i ))(χ He residue (t i ) Unit is%).
S230, calculating desorption helium information according to the accumulated desorption gas volume and the volume percentage of helium at a plurality of moments.
In some embodiments, S230 may include: calculating the volume of desorption gas at each moment according to the accumulated volume of desorption gas at a plurality of moments; calculating the helium desorption amount at each moment according to the desorption gas volume at each moment and the helium volume percentage at each moment; calculating the accumulated helium desorption amount at each moment according to the helium desorption amount at each moment; and calculating desorption helium information according to the accumulated helium desorption amount and the helium dynamic model at each moment.
In the embodiment of the invention, the shale gas in-situ desorption stage mainly comprises shale gas in a free state and a partial adsorption state, wherein the associated helium gas mainly comprises the free state and a small amount of adsorption state. In order to facilitate the analysis of the subsequent shale gas associated helium content, the gas volume measured by on-site desorption needs to be converted to the standard condition (the temperature is 0 ℃ and the pressure is 101.325 kPa), and the conversion formula is as follows:
wherein V is Desorbing STP (t i ) T is under standard conditions i The unit of the desorption gas volume of shale gas at moment is cm 3 ；V Desorption of (t i ) The unit of the desorption gas volume of shale gas measured under the field condition of the field desorption experiment is cm 3 ；P Desorption of Atmospheric pressure at the site of the desorption experiment workplace, units: kPa; t (T) Desorption of The unit is the ambient temperature of the field desorption experiment workplace: DEG C.
In order to better analyze the shale gas and the helium content in the shale gas in the desorption process, the desorption gas quantity is converted into the desorption gas quantity of unit mass, and the desorption volume V is accumulated according to the mass m1 of the shale sample and the shale gas SG desorption (t i ) Then there are:
in the formula，V SG desorption (t i ) At t i The cumulative desorption volume of shale gas at moment is in cm 3 ；Q SG desorption (t i ) At t i The desorption amount of shale gas at moment is expressed in cm 3 /g；t i The desorption time of shale gas is expressed in min; m is m 1 The mass of the shale sample used for the desorption experiment is given in g.
In order to evaluate the dynamic change of helium content in the shale gas desorption process, the diffusion behavior in the shale gas desorption process needs to be described first.
In some embodiments, the method further comprises: acquiring accumulated shale gas desorption amount at each moment; determining shale gas desorption information according to the accumulated shale gas desorption amount and the shale aerodynamic model at each moment; wherein, shale gas desorption information includes: total shale gas desorption amount, shale gas diffusion coefficient, shale gas diffusion radius and diffusion distance;
the dynamic model of shale gas in shale reservoirs is as follows:
wherein Q is SG desorption (t i ) At t i Accumulated shale gas desorption amount at moment, with unit of cm 3 /g；Q He desorption The total desorption amount of shale gas is in cm 3 /g；t i The desorption time of shale gas is expressed in min; h is a 1 And r 1 The unit of the diffusion distance of the shale gas in the shale reservoir and the diffusion radius of the shale gas are cm respectively; d (D) 1-1 And D 2-1 The unit is cm for the shale gas diffusion coefficient of the shale gas with different spatial scales in the shale reservoir 2 S; n is a natural number, and the research requirement can be met by generally taking 10. According to the measured desorption data, the shale pneumatic dynamic change rule in the shale gas desorption process can be known through regression analysis, and the maximum desorption gas quantity Q of the shale gas is obtained SG desorption At the same time obtain the diffusion coefficient D of shale gas 1-1 And D 1-2 Shale gas diffusion radius r 1 And diffusion ofDistance h 1 Isokinetic related parameters.
By desorption experimental results or shale aerodynamic model regression results, at time t i The volume of shale gas at the desorption stage can be calculated according to the following formula:
ΔQ SG desorption (t i )＝Q SG desorption (t i )-Q SG desorption (t i-1 ) (4)
Wherein DeltaQ SG desorption (t i ) At t i The shale gas desorption amount at moment is expressed in cm 3 /g；Q SG desorption (t i ) And Q SG desorption (t i-1 ) Respectively t i And t i-1 The unit of the accumulated desorption quantity of the shale gas at moment is cm 3 /g。
In order to analyze the dynamic change of the helium content of the reservoir during desorption, the helium content at different desorption moments needs to be obtained. According to the desorption experimental result and combining the acquired helium content test result, the time t is known i The volume of desorbed helium is:
wherein DeltaQ He desorption (t i ) At t i The desorption amount of helium at the moment is expressed in cm 3 /g；Q SG desorption (t i ) And Q SG desorption (t i-1 ) Respectively t i And t i-1 The unit of the accumulated desorption quantity of the shale gas at moment is cm 3 /g；χ He desorption (t i ) At t i The volume percent of helium at time is in%.
The desorbed helium information includes: maximum helium desorption amount, helium diffusion coefficient, helium diffusion radius and diffusion distance; the desorption behavior of helium in shale reservoirs conforms to a kinetic model, and then:
wherein Q is Solution of HeSuction pipe (t i ) At t i Cumulative helium desorption in cm at time 3 /g；Q He desorption Maximum desorption amount of helium in cm 3 /g；t i The desorption time of helium is expressed in min; h is a 2 And r 2 Helium diffusion distance and helium diffusion radius of helium in the shale reservoir are respectively shown in cm; d (D) 1-2 And D 2-2 Helium diffusion coefficients for helium at different spatial scales in shale reservoirs in cm 2 S; n is a natural number, and the research requirement can be met by generally taking 10.
In the embodiment of the invention, according to helium content data obtained in a desorption experiment, the dynamic change rule of the helium content in the shale gas desorption process can be known through regression analysis, and the maximum desorption gas quantity Q of helium (namely the accumulated desorption helium quantity in the desorption experiment) is mainly obtained He desorption Also obtain helium diffusion coefficient D 1-2 And D 2-2 Helium diffusion radius r 2 And a diffusion distance h 2 Etc. related parameters. Accumulated desorption helium quantity Q obtained in shale gas desorption experiment He desorption The potential of helium resources in the shale reservoir, which is mainly in a free state, is reflected.
In addition to the regression analysis approach described above, calculation of the desorbed helium information may also be accomplished by a neural network. In some embodiments, S230 may include: and inputting the cumulative desorption gas volume percentage at a plurality of moments and the helium volume percentage at each moment into a pre-established neural network to obtain desorption helium information.
According to the embodiment of the invention, the cumulative desorption gas volume percentage and the helium volume percentage at each moment can be measured according to experiments, then the artificially measured desorption helium information is combined to form a sample set, the neural network is trained, and the cumulative desorption gas volume percentage and the helium volume percentage at each moment can be obtained only by inputting the cumulative desorption gas volume percentage at a plurality of moments into the neural network during actual calculation.
S240, calculating residual helium information according to the cumulative residual gas volume and the residual helium volume percentage at a plurality of moments.
In some embodiments, S240 may include: calculating the residual gas volume at each moment according to the accumulated residual gas volumes at a plurality of moments; calculating the helium residual quantity at each moment according to the residual gas volume at each moment and the helium volume percentage at each moment; and calculating the accumulated helium residual quantity at each moment according to the helium residual quantity at each moment.
In the embodiment of the invention, the residual gas measurement experiment is used for measuring different moments t i Cumulative gas volume V SG residues (t i ) Under the condition of being converted to a standard condition (the temperature is 0 ℃ and the pressure is 101.325 kPa), the conversion formula is as follows:
wherein V is SG residual STP (t i ) T is under standard conditions i The residual gas volume of shale gas at moment is in cm 3 ；V SG residues (t i ) For t determined under residual gas test conditions i The residual gas volume of shale gas at moment is in cm 3 ；P Residual of The atmospheric pressure of a workplace under the residual gas amount experimental test condition is measured in units of kPa; t (T) Residual of The unit is the ambient temperature of the workplace under the residual gas amount experimental test condition.
In order to better analyze the helium content in the residual gas, the residual gas is converted into the residual gas of unit mass according to the mass m of the shale sample 2 Residual gas volume V measured by shale gas accumulation SG residues (t i ) Then there are:
wherein Q is SG residues (t i ) At t i Residual gas quantity measured by accumulation of shale gas at moment in cm 3 /g；V SG residues (t i ) At t i Residual gas volume measured by shale gas accumulation at moment in cm 3 ；t i The shale gas residual testing time is expressed in min; m is m 2 The mass of the shale sample used for the desorption experiment is given in g. When the i value is the last tested times, the shale gas residual quantity Q can be obtained SG residues 。
Through the residual gas test result, at time t i The stage residual gas amount in the residual gas test experiment can be calculated according to the following formula:
ΔQ SG residues (t i )＝Q SG residues (t i )-Q SG residues (t i-1 ) (9)
Wherein DeltaQ SG residues (t i ) T in shale gas residual capacity determination experiment i The residual gas quantity of shale gas is measured at any time, and the unit is cm 3 /g；Q SG residues (t i ) And Q SG residues (t i-1 ) Respectively t i And t i-1 The unit of the accumulated residual gas measured at the moment is cm 3 /g。
In order to analyze the helium content characteristics in shale reservoirs during residual gas testing, different residual moments t need to be acquired i Helium content Δq of (2) He residue (t i ). According to the residual gas test experimental result and combining the obtained helium content test result, different moments t can be calculated i Helium content Δq in residual gas He residue (t i ) The method comprises the following steps:
wherein DeltaQ He residue (t i ) At t i Helium phase residual quantity per unit cm at moment 3 /g；Q SG residues (t i ) And Q SG residues (t i-1 ) Respectively t i And t i-1 The unit of the accumulated residual quantity of the shale gas tested at the moment is cm 3 /g；χ He residue (t i ) At t i The volume percent of helium measured at the moment is in%.
According to the residual gas amount test experimental resultKnowing time t i The cumulative helium volume of the residual gas can also be expressed as:
wherein Q is SG desorption (t i ) At t i The cumulative test quantity of helium in residual gas at moment, with the unit of cm 3 /g；ΔQ He residue (t i ) At t i Helium phase test amount in cm in residual gas at moment 3 And/g. When the i value is m times of taking the residual gas quantity after the test is finished, obtaining the helium content Q in the residual gas He residue The method comprises the steps of carrying out a first treatment on the surface of the m is the number of data recordings at the end of the residual gas test.
S250, calculating total helium information of the shale reservoir according to the desorption helium information and the residual helium information.
In an embodiment of the invention, the total helium information of the shale reservoir includes an absolute total helium amount and a relative total helium content. Based on the analysis of the characteristics of helium in the inspiration and residual gases, the absolute total helium content of shale gas associated helium in the shale reservoir can be further analyzed.
In some embodiments, S250 may include:
Q he total ＝Q He desorption +Q He residue (12)
Q SG total ＝Q SG desorption +Q SG residues (13)
Wherein Q is He total Is absolute total helium quantity, Q He desorption For maximum desorbed helium quantity, Q He residue For the final cumulative helium residual quantity, Q SG total Is absolute total helium quantity, Q SG desorption Total shale gas desorption, Q SG residues The unit of the above parameters is cm for the residual total amount of shale gas 3 /g，χ He total Relative to total helium content in%.
In summary, the beneficial effects of the invention are as follows:
(1) According to the method, the shale gas and helium percentage content data of two experiments are obtained by means of two shale gas analysis experiments (namely a shale gas desorption experiment and a residual gas test experiment), and the total helium content in the shale reservoir can be calculated by analyzing the helium content in desorption gas and residual gas.
(2) The shale gas associated helium content which can be obtained by the invention is given in two forms of absolute content and relative content, namely the absolute total helium content Q is obtained Total He And relative total helium content χ He The two final parameters further enable the understanding of the helium content to be more comprehensive and deep, and inaccuracy and incompleteness of single data depiction are avoided;
(3) The invention simultaneously realizes the characterization of helium dynamic behavior in the shale gas desorption process, and mainly obtains the maximum desorption gas quantity (namely the accumulated desorption helium quantity in the desorption experiment) Q of helium for characterizing the diffusion behavior of helium in the shale reservoir He desorption Data also obtained helium diffusion coefficient D 1-1 And D 2-1 Helium diffusion radius r 2 And a diffusion distance h 2 -waiting for a relevant kinetic parameter;
(4) The invention simultaneously realizes the description of shale aerodynamic behaviors in the shale gas desorption process, and mainly obtains the shale gas accumulated desorption gas quantity Q for describing the diffusion behaviors of the shale gas in the shale reservoir SG desorption Data and also obtain the diffusion coefficient D of shale gas 1-2 And D 2-2 Shale gas diffusion radius r 1 And a diffusion distance h 1 -waiting for a relevant kinetic parameter;
(5) The occurrence, distribution and associated characteristics of helium in the shale reservoir are considered, and different calculation methods are adopted for helium in shale gas desorption experiments and residual gas determination experiments;
(6) The calculation of the shale gas associated helium content is established on the basis of shale gas content test analysis, so that the simultaneous evaluation of shale gas content and helium content can be realized;
(7) Compared with the traditional shale gas on-site desorption, the method provided by the invention omits the estimation of the loss gas quantity by adopting the pressure-maintaining coring mode, and improves the authenticity and reliability of shale helium content evaluation analysis;
(8) According to the invention, helium in desorption gas, helium in residual gas and total helium are analyzed, so that the helium content of the shale reservoir is more comprehensively and deeply known.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a shale gas associated helium content obtaining device according to an embodiment of the present invention.
As shown in fig. 3, in some embodiments, the shale gas based associated helium content obtaining apparatus 3 comprises:
a first obtaining module 310, configured to obtain cumulative desorption gas volumes and desorption helium volume percentages measured by a desorption experiment at a plurality of moments;
a second obtaining module 320, configured to obtain cumulative residual gas volumes and residual helium volume percentages measured by residual gas experiments at a plurality of moments;
a first calculation module 330 for calculating desorption helium information according to cumulative desorption gas volume and helium volume percentages at a plurality of moments;
a second calculation module 340, configured to calculate residual helium information according to the cumulative residual gas volume and the residual helium volume percentage at a plurality of moments;
the helium calculation module 350 is configured to calculate total helium information of the shale reservoir based on the desorbed helium information and the residual helium information.
Optionally, the first computing module 330 is configured to: calculating the volume of desorption gas at each moment according to the accumulated volume of desorption gas at a plurality of moments; calculating the helium desorption amount at each moment according to the desorption gas volume at each moment and the helium volume percentage at each moment; calculating the accumulated helium desorption amount at each moment according to the helium desorption amount at each moment; and calculating desorption helium information according to the accumulated helium desorption amount and the helium dynamic model at each moment.
Optionally, the desorbed helium information comprises: maximum helium desorption amount, helium diffusion coefficient, helium diffusion radius and diffusion distance; the kinetic model of helium in shale reservoirs is:
wherein Q is He desorption (t i ) At t i Cumulative helium desorption in cm at time 3 /g；Q He desorption Maximum desorption amount of helium in cm 3 /g；t i The desorption time of helium is expressed in min; h is a 2 And r 2 Helium diffusion distance and helium diffusion radius of helium in the shale reservoir are respectively shown in cm; d (D) 1-2 And D 2-2 Helium diffusion coefficients for helium at different spatial scales in shale reservoirs in cm 2 S; n is a natural number, and the research requirement can be met by generally taking 10.
Optionally, the first computing module 330 is configured to: and inputting the cumulative desorption gas volume percentage at a plurality of moments and the helium volume percentage at each moment into a pre-established neural network to obtain desorption helium information.
Optionally, the second calculating module 340 is configured to: calculating the residual gas volume at each moment according to the accumulated residual gas volumes at a plurality of moments; calculating the helium residual quantity at each moment according to the residual gas volume at each moment and the helium volume percentage at each moment; and calculating the accumulated helium residual quantity at each moment according to the helium residual quantity at each moment.
Optionally, the second calculating module 340 is configured to:
wherein Q is He residue (t i ) At t i Time of dayDelta Q is the cumulative helium residual quantity He residue (t i ) At t i Helium residual quantity at time, m is total time.
Optionally, the helium calculating module 350 is configured to:
Q he total ＝Q He desorption +Q He residue
Q SG total ＝Q SG desorption +Q SG residues
Wherein Q is He total Is absolute total helium quantity, Q He desorption For maximum desorbed helium quantity, Q He residue For the final cumulative helium residual quantity, Q SG total Is absolute total helium quantity, Q SG desorption Total shale gas desorption, Q SG residues Chi is the residual total amount of shale gas He total Relative to total helium content.
Optionally, the shale gas associated helium content obtaining device 3 further comprises: the shale gas calculation module is used for acquiring accumulated shale gas desorption amount at each moment; determining shale gas desorption information according to the accumulated shale gas desorption amount and the shale aerodynamic model at each moment; wherein, shale gas desorption information includes: total shale gas desorption amount, shale gas diffusion coefficient, shale gas diffusion radius and diffusion distance;
the dynamic model of shale gas in shale reservoirs is as follows:
wherein Q is SG desorption (t i ) At t i Accumulated shale gas desorption amount at moment, with unit of cm 3 /g；Q He desorption The total desorption amount of shale gas is in cm 3 /g；t i The desorption time of shale gas is expressed in min; h is a 1 And r 1 The unit of the diffusion distance of the shale gas in the shale reservoir and the diffusion radius of the shale gas are cm respectively; d (D) 1-1 And D 2-1 The unit is cm for the shale gas diffusion coefficient of the shale gas with different spatial scales in the shale reservoir 2 S; n is a natural number, and the research requirement can be met by generally taking 10.
The shale gas associated helium content obtaining device provided by the embodiment can be used for executing the method embodiment, and the implementation principle and the technical effect are similar, and the embodiment is not repeated here.
Fig. 4 is a schematic structural diagram of a terminal according to an embodiment of the present invention. As shown in fig. 4, a terminal 4 according to an embodiment of the present invention is provided, and the terminal 4 according to the embodiment includes: a processor 40, a memory 41 and a computer program 42 stored in the memory 41 and executable on the processor 40. The processor 40, when executing the computer program 42, performs the steps described above for each of the shale gas associated helium content obtaining method embodiments, such as the steps shown in fig. 2. Alternatively, the processor 40, when executing the computer program 42, performs the functions of the modules/units of the system embodiments described above, e.g., the functions of the modules shown in fig. 4.
By way of example, the computer program 42 may be partitioned into one or more modules/units, which are stored in the memory 41 and executed by the processor 40 to complete the present invention. One or more of the modules/units may be a series of computer program instruction segments capable of performing a specific function for describing the execution of the computer program 42 in the terminal 4.
The terminal 4 may be a terminal or a server, and the terminal may be a mobile phone, an MCU, an ECU, an industrial personal computer, etc., which are not limited herein, and the server may be a physical server, a cloud server, etc., which are not limited herein. The terminal 4 may include, but is not limited to, a processor 40, a memory 41. It will be appreciated by those skilled in the art that fig. 4 is merely an example of the terminal 4 and is not intended to limit the terminal 4, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the terminal may further include an input-output device, a network access device, a bus, etc.
The processor 40 may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field-programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 41 may be an internal storage unit of the terminal 4, such as a hard disk or a memory of the terminal 4. The memory 41 may also be an external storage device of the terminal 4, such as a plug-in hard disk provided on the terminal 4, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like. Further, the memory 41 may also include both an internal storage unit and an external storage device of the terminal 4. The memory 41 is used to store computer programs and other programs and data required by the terminal. The memory 41 may also be used to temporarily store data that has been output or is to be output.
The embodiment of the invention provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the steps in the embodiment of the shale gas associated helium content acquisition method are realized when the computer program is executed by a processor.
The computer readable storage medium stores a computer program 42, the computer program 42 comprising program instructions which, when executed by the processor 40, implement all or part of the processes of the above described embodiments, or may be implemented by means of hardware associated with the instructions of the computer program 42, the computer program 42 being stored in a computer readable storage medium, the computer program 42, when executed by the processor 40, implementing the steps of the above described embodiments of the method. The computer program 42 comprises computer program code, which may be in the form of source code, object code, executable files, or in some intermediate form, among others. The computer readable medium may include: any entity or device capable of carrying computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
The computer readable storage medium may be an internal storage unit of the terminal of any of the foregoing embodiments, such as a hard disk or a memory of the terminal. The computer readable storage medium may also be an external storage device of the terminal, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the terminal. Further, the computer-readable storage medium may also include both an internal storage unit of the terminal and an external storage device. The computer-readable storage medium is used to store a computer program and other programs and data required for the terminal. The computer-readable storage medium may also be used to temporarily store data that has been output or is to be output.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal and method may be implemented in other manners. For example, the apparatus/terminal embodiments described above are merely illustrative, e.g., the division of modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, and the computer program may be stored in a computer readable storage medium, where the computer program, when executed by a processor, may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, executable files or in some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (10)
1. A shale gas associated helium content acquisition method, the method comprising:
acquiring the cumulative desorption gas volume and the volume percentage of the desorption helium measured by the desorption experiment at a plurality of moments;
acquiring the cumulative residual gas volume and the residual helium volume percentage measured by a residual gas experiment at a plurality of moments;
calculating desorption helium information according to accumulated desorption gas and helium volume percentage at a plurality of moments;
calculating residual helium information according to the accumulated residual gas and the residual helium volume percentage at a plurality of moments;
and calculating total helium information of the shale reservoir according to the desorption helium information and the residual helium information.
2. The shale gas associated helium content obtaining method according to claim 1, wherein calculating the desorbed helium information according to cumulative desorbed gas volume and helium volume percentages at a plurality of time instants comprises:
calculating the volume of desorption gas at each moment according to the accumulated volume of desorption gas at a plurality of moments;
calculating the helium desorption amount at each moment according to the desorption gas volume at each moment and the helium volume percentage at each moment;
calculating the accumulated helium desorption amount at each moment according to the helium desorption amount at each moment;
and calculating desorption helium information according to the accumulated helium desorption amount and the helium dynamic model at each moment.
3. The shale gas associated helium content obtaining method according to claim 1, wherein the desorbed helium information comprises: maximum shale gas desorption amount, helium gas diffusion coefficient, helium gas diffusion radius and helium gas diffusion distance;
the helium dynamic model is as follows:
wherein Q is He desorption (t i ) At t i Cumulative helium desorption in cm at time 3 /g；Q He desorption Maximum of heliumDesorption amount in cm 3 /g；t i The desorption time of helium is expressed in min; h is a 2 And r 2 Helium diffusion distance and helium diffusion radius of helium in the shale reservoir are respectively shown in cm; d (D) 1-2 And D 2-2 Helium diffusion coefficients for helium at different spatial scales in shale reservoirs in cm 2 S; n is a natural number.
4. The shale gas associated helium content obtaining method according to claim 1, wherein calculating the desorbed helium information according to cumulative desorbed gas volume and helium volume percentages at a plurality of time instants comprises:
and inputting the cumulative desorption gas volume percentage at a plurality of moments and the helium volume percentage at each moment into a pre-established neural network to obtain desorption helium information.
5. The shale gas associated helium content obtaining method according to claim 1, wherein calculating residual helium information according to cumulative residual gas volume and residual helium volume percentage at a plurality of moments comprises:
calculating the residual gas volume at each moment according to the accumulated residual gas volumes at a plurality of moments;
calculating the helium residual quantity at each moment according to the residual gas volume at each moment and the helium volume percentage at each moment;
and calculating the accumulated helium residual quantity at each moment according to the helium residual quantity at each moment.
6. The shale gas associated helium content obtaining method according to claim 1, wherein calculating the accumulated helium residual quantity at each moment according to the helium residual quantity at each moment comprises:
wherein Q is He residue (t i ) At t i Accumulated helium residual quantity delta Q at moment He residue (t i ) At t i Helium residual quantity at time, m is total time.
7. The shale gas associated helium content obtaining method according to claim 1, wherein the total helium information comprises an absolute total helium content and a relative total helium content; the calculating total helium information of the shale reservoir according to the desorption helium information and the residual helium information comprises the following steps:
Q he total ＝Q He desorption +Q He residue
Q SG total ＝Q SG desorption +Q SG residues
Wherein Q is He total Is absolute total helium quantity, Q He desorption For maximum desorbed helium quantity, Q He residue For the final cumulative helium residual quantity, Q SG total Is absolute total helium quantity, Q SG desorption Total shale gas desorption, Q SG residues Chi is the residual total amount of shale gas He total Relative to total helium content.
8. The shale gas associated helium content obtaining method according to claim 7, further comprising:
acquiring accumulated shale gas desorption amount at each moment;
determining shale gas desorption information according to the accumulated shale gas desorption amount and the shale aerodynamic model at each moment; wherein, the shale gas desorption information comprises: total shale gas desorption amount, shale gas diffusion coefficient, shale gas diffusion radius and shale gas diffusion distance;
the shale aerodynamics model is as follows:
wherein Q is SG desorption (t i ) At t i Accumulated shale gas desorption amount at moment, with unit of cm 3 /g；Q He desorption The total desorption amount of shale gas is in cm 3 /g；t i The desorption time of shale gas is expressed in min; h is a 1 And r 1 The unit of the diffusion distance of the shale gas in the shale reservoir and the diffusion radius of the shale gas are cm respectively; d (D) 1-1 And D 2-1 The unit is cm for the shale gas diffusion coefficient of the shale gas with different spatial scales in the shale reservoir 2 S; n is a natural number.
9. A terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, implements the steps of the shale gas associated helium content obtaining method according to any of the preceding claims 1 to 8.
10. A computer readable storage medium, characterized in that it stores a computer program which, when executed by a processor, implements the steps of the shale gas associated helium content obtaining method according to any of the preceding claims 1 to 8.
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