CN106326545B - Determine the method and system of horizontal well shale gas reservoir formation parameter - Google Patents
Determine the method and system of horizontal well shale gas reservoir formation parameter Download PDFInfo
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- CN106326545B CN106326545B CN201610705715.6A CN201610705715A CN106326545B CN 106326545 B CN106326545 B CN 106326545B CN 201610705715 A CN201610705715 A CN 201610705715A CN 106326545 B CN106326545 B CN 106326545B
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Abstract
The embodiment of the invention provides a kind of method and systems of determining horizontal well shale gas reservoir formation parameter, wherein this method comprises: setting initial formation parameter；It is calculated according to initial formation parameter by simulation, obtains bottom pressure, draw the theoretical curve of bottom pressure, drop of pressure and pressure derivative；Above-mentioned theory curve and corresponding measured curve are fitted, fitting result is obtained；If fitting result meets default required precision, initial formation parameter is determined as actual formation parameter；If being unsatisfactory for default required precision, initial formation parameter is corrected according to the length and position of intending straightway, required precision is preset until fitting result meets, the initial formation parameter after correction is determined as actual formation parameter.It since the program determines formation parameter according to quasi- straightway, thus solves and determines slow-footed technical problem existing for unstable state well-logging method, achieved the purpose that quick, accurate determining horizontal well shale gas reservoir formation parameter.
Description
Technical field
The present invention relates to Reservoir Development technical field, in particular to a kind of determining horizontal well shale gas reservoir formation parameter
Method and system.
Background technique
In practical Reservoir Development, shale gas reservoir is generally referred to as the more difficult gas of geological storage complicated condition, exploitation
Hiding.During specific oil-gas exploration, the correlation circumstance of accurate description shale gas reservoir is of great significance in actual production,
And the geologic parameter of shale gas reservoir is a significant data for describing the correlation circumstance of shale gas reservoir.Wherein, due to level
The geologic parameter of the characteristic of well itself, horizontal well shale gas reservoir generally comprises: parameter is adsorbed on stratum, and (such as gas absorption pressure is gentle
Body adsorbance etc.), in-place permeability, skin factor, fracture half-length, (such as boundary types and boundary are big for porosity and boundary parameter
It is small etc.) etc..For the correlation circumstance of accurate description horizontal well shale gas reservoir, how horizontal well shale gas is accurately and rapidly determined
The formation parameter of hiding is always a problem of people pay special attention to.
The formation parameter of horizontal well shale gas reservoir, unstable state examination are presently mainly determined by unstable state well-logging method
Well method can be generally divided into conventional well testing and Modern test well, but horizontal well shale gas is mostly mainly determined by seepage theory
The formation parameter of hiding.Wherein, conventional well testing be usually drawn in rectangular co-ordinate or semilog coordinate the bottom pressure of actual measurement with
The straightway of time change, using the slope of the straightway come the formation parameter of reverse shale gas reservoir；And Modern test well is foundation
Seepage theory calculates the shaft bottom dimensionless pressure under given parameters to the curve of nondimensional time, referred to as theory plate, then will
Measured curve is fitted with theoretical plate, and the formation parameter of shale gas reservoir is determined with this.
However, when it is implemented, because unstable state well-logging method by seepage theory determines shale gas reservoir formation parameter, it is past
Toward there are determination process trouble, determine slow-footed problem.
In view of the above-mentioned problems, currently no effective solution has been proposed.
Summary of the invention
The embodiment of the invention provides a kind of method and systems of determining horizontal well shale gas reservoir formation parameter, to reach fast
Speed determines the purpose of the horizontal well shale gas reservoir formation parameter.
The embodiment of the invention provides a kind of methods of determining horizontal well shale gas reservoir formation parameter, comprising:
Set the initial formation parameter of horizontal well shale gas reservoir；
Simulation calculating is carried out according to the initial formation parameter, obtains the bottom pressure of the shale gas reservoir, and according to institute
Bottom pressure is stated, bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative theoretical curve are drawn；
According to the bottom pressure theoretical curve, bottom pressure landing theoretical curve, bottom pressure derivative reason
By curve, bottom pressure measured curve, bottom pressure landing measured curve and bottom pressure derivative measured curve, by being fitted,
Obtain fitting result；
If the fitting result meets default required precision, the initial formation parameter is determined as the shale gas
The actual formation parameter of hiding；
If the fitting result is unsatisfactory for default required precision, according to the quasi- straightway of theoretical curve to described initial
Formation parameter carries out one or many correct operations, until the fitting result obtained based on the initial formation parameter after correction is met
The default required precision, and the initial formation parameter after correction is determined as to the actual formation parameter of the shale gas reservoir.
In one embodiment, simulation calculating is carried out according to the initial formation parameter, obtains the well of the shale gas reservoir
Bottom pressure, and according to the bottom pressure, draw bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure
Derivative theoretical curve, comprising:
Obtain the initial condition parameters of the shale gas reservoir and the wellbore parameters of the shale gas reservoir；
By the first of the initial condition parameters of the shale gas reservoir, the wellbore parameters of the shale gas reservoir and the shale gas reservoir
Parameter sets of the beginning formation parameter as the shale gas reservoir；
Establish the flow model of the shale gas reservoir；
Determine pit shaft type, production method and the working condition of the shale gas reservoir；
According to the parameter sets, the flow model, the pit shaft type, the production method and the production are utilized
Condition carries out simulation calculating, obtains the bottom pressure of the shale gas reservoir；
According to the bottom pressure, drafting obtains the bottom pressure theoretical curve, the theoretical song of bottom pressure landing
Line and the bottom pressure derivative theoretical curve.
In one embodiment, the flow model of the shale gas reservoir is established, comprising:
The initial flow model of the shale gas reservoir is modified according to apparent permeability formula and Darcy's law, will be corrected
First correction model of the initial flow model of shale gas reservoir afterwards as the shale gas reservoir；
By establishing single-component gas adsorption equation, the first correction model of the shale gas reservoir is adjusted, is obtained
Second correction model of the shale gas reservoir；
According to the principle of mass conservation, the second correction model of the shale gas reservoir is adjusted, by what is obtained after adjustment
Flow model of second correction model of the shale gas reservoir as the shale gas reservoir.
In one embodiment, it is described according to the bottom pressure theoretical curve, the bottom pressure landing theoretical curve,
The bottom pressure derivative theoretical curve, bottom pressure measured curve, bottom pressure landing measured curve and bottom pressure derivative
Measured curve obtains fitting result by fitting, comprising:
According to the bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative reason
By curve, theoretical pressure difference and theoretical pressure derivative are obtained；
According to the theoretical pressure difference and the theoretical pressure derivative, pair of theoretical pressure difference and theoretical pressure derivative is drawn
Logarithmic chart；
It is real according to the bottom pressure measured curve, bottom pressure landing measured curve and the bottom pressure derivative
Curve is surveyed, observed pressure difference and observed pressure derivative are obtained；
According to the observed pressure difference and the observed pressure derivative, pair of observed pressure difference and observed pressure derivative is drawn
Logarithmic chart；
The log-log graph and the observed pressure difference of the theoretical pressure difference and theoretical pressure derivative and observed pressure are led
Several log-log graphs are fitted, and obtain the fitting result.
In one embodiment, the quasi- straightway according to theoretical curve to the initial formation parameter carry out it is primary or
Multiple correct operation, comprising:
The initial formation parameter is adjusted according to the quasi- straightway of the theoretical curve, the initial stratum ginseng after being corrected
Number；
According to the initial formation parameter after the correction, calculated by simulation, after obtaining the correction of the shale gas reservoir
Bottom pressure, and draw correction after bottom pressure theoretical curve, after correction bottom pressure landing theoretical curve and correction after
Bottom pressure derivative theoretical curve；
According to the bottom pressure theoretical curve, bottom pressure landing theoretical curve, bottom pressure derivative reason
It is bent by curve, the bottom pressure measured curve, bottom pressure landing measured curve and bottom pressure derivative actual measurement
Line obtains fitting result by fitting.
In one embodiment, the initial formation parameter is adjusted according to the quasi- straightway of the theoretical curve, obtains school
Initial formation parameter after just, comprising:
It is respectively compared the bottom pressure theoretical curve and the bottom pressure measured curve, the bottom pressure landing reason
By curve and bottom pressure landing measured curve, the bottom pressure derivative theoretical curve and the bottom pressure derivative are real
Theoretical curve is surveyed, comparison result is obtained；
According to the quasi- straightway of the comparison result and the theoretical curve, the initial formation parameter is adjusted, school is obtained
Initial formation parameter after just.
In one embodiment, the initial formation parameter includes at least one of: adsorbing parameter, stratum infiltration in stratum
Rate, skin factor, fracture half-length and porosity.
In one embodiment, in the case where the initial formation parameter includes the stratum absorption parameter, according to institute
Comparison result is stated, the formation parameter is adjusted, comprising:
It is shorter than the bottom pressure landing measured curve in the quasi- length of straigh line of bottom pressure landing theoretical curve
Quasi- length of straigh line in the case where, then increase stratum absorption parameter；
It is greater than bottom pressure landing measured curve in the quasi- length of straigh line of bottom pressure landing theoretical curve
Quasi- length of straigh line in the case where, then reduce stratum absorption parameter.
It in one embodiment, include at least one of in the initial formation parameter: the in-place permeability, described
It is corresponding to adjust the in-place permeability, the table according to the comparison result in the case where skin factor and the fracture half-length
The skin factor and the fracture half-length, comprising:
It is higher than bottom pressure landing measured curve in the quasi- straight line fragment position of bottom pressure landing theoretical curve
Quasi- straight line fragment position in the case where, then increase the in-place permeability, the skin factor and the fracture half-length；
It is lower than bottom pressure landing measured curve in the quasi- straight line fragment position of bottom pressure landing theoretical curve
Quasi- straight line fragment position in the case where, then reduce the in-place permeability, the skin factor and the fracture half-length.
In one embodiment, in the case where the initial formation parameter includes porosity described in the table, according to institute
Comparison result is stated, the porosity is adjusted, comprising:
It is bent according to the position of the quasi- straightway of bottom pressure landing theoretical curve and bottom pressure landing actual measurement
The quasi- straight line fragment position of line adjusts the porosity.
Based on identical inventive concept, the embodiment of the invention also provides a kind of determining horizontal well shale gas reservoir formation parameters
System, comprising:
Initial setting module, for setting the initial formation parameter of horizontal well shale gas reservoir；
Simulation calculation module obtains the shale gas reservoir for carrying out simulation calculating according to the initial formation parameter
Bottom pressure, and according to the bottom pressure, draw bottom pressure theoretical curve, bottom pressure landing theoretical curve and shaft bottom pressure
Power derivative theoretical curve；
Fitting module, for according to the bottom pressure theoretical curve, the bottom pressure landing theoretical curve, the well
Bottom pressure derivative theoretical curve, bottom pressure measured curve, bottom pressure landing measured curve and the actual measurement of bottom pressure derivative are bent
Line obtains fitting result by fitting；
Determining module, if the fitting result meets default required precision, for the initial formation parameter is true
It is set to the actual formation parameter of the shale gas reservoir；If the fitting result is unsatisfactory for default required precision, it to be used for basis
The quasi- straightway of theoretical curve carries out one or many correct operations to the initial formation parameter, until based on first after correction
The fitting result that beginning formation parameter obtains meets the default required precision, and the initial formation parameter after correction is determined as institute
State the actual formation parameter of shale gas reservoir.
In the embodiment of the present invention, the set initial stratum of shale gas reservoir is joined by the quasi- straightway using theoretical curve
Number is pointedly corrected, and determines actual formation parameter, is solved existing method and is determined by unstable state well-logging method
Existing determining formation parameter cumbersome, determination process the technical issues of time-consuming during shale gas reservoir formation parameter,
Quick, accurate determining horizontal well shale gas reservoir formation parameter is achieved the purpose that.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, not
Constitute limitation of the invention.In the accompanying drawings:
Fig. 1 is the method process flow diagram of determining horizontal well shale gas reservoir formation parameter according to an embodiment of the present invention；
Fig. 2 be determining horizontal well shale gas reservoir formation parameter according to an embodiment of the present invention method in correct operation processing
Flow chart；
Fig. 3 is the system structure diagram of determining horizontal well shale gas reservoir formation parameter according to an embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, right below with reference to embodiment and attached drawing
The present invention is described in further details.Here, exemplary embodiment and its explanation of the invention is used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
In view of the unstable state well-logging method mainly used at present determines the formation parameter of the shale gas reservoir of horizontal well, having
When body is implemented, by unstable state well-logging method determine the process of shale gas reservoir formation parameter there are determination process trouble, determine speed
Spend slow problem.In fact, bottom pressure landing theoretical curve will appear quasi- straightway in shale gas adsorption and desorption,
The quasi- formation parameter of the straightway actually with the shale gas reservoir studied has close ties, utilizes this connection, Ke Yitong
Quasi- straightway is crossed, determines the formation parameter of shale gas reservoir, also, compared to existing method, quasi- straightway is easy to determining, while really
It is also shorter to determine process time-consuming.Based on the above situation, in order to solve, determination process existing in the prior art is troublesome, determines that speed is slow
The problem of, consider the adsorbed gas that stratum can be added, using corresponding properties, quasi- straightway is obtained, so as to according to quasi- straight line
Section quickly determines the formation parameter of shale gas reservoir.
Based on above-mentioned thinking, and consider the concrete property of horizontal well, the embodiment of the invention provides a kind of determining horizontal
The method of well shale gas reservoir formation parameter, as shown in Figure 1, may include:
Step 101: the initial formation parameter of setting horizontal well shale gas reservoir；
When it is implemented, being directed to horizontal well shale gas reservoir, it is contemplated that the correlation properties of horizontal well pass through step 101 basis
Situation is embodied, in conjunction with related surveying and mapping data, respectively to stratum absorption parameter, in-place permeability, skin factor and porosity
Set initial value, the setting of the initial formation parameter of complete paired parallel horizontal wells shale gas reservoir.
Step 102: simulation calculating being carried out according to initial formation parameter, obtains the bottom pressure of shale gas reservoir, and according to well
Bottom pressure draws bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative theoretical curve；
When it is implemented, in order to draw above-mentioned bottom pressure theoretical curve, bottom pressure landing theoretical curve and shaft bottom
Pressure derivative theoretical curve, needs that bottom pressure is calculated by simulation, draws above-mentioned theory curve further according to bottom pressure,
And carry out simulation calculating process not only need to use the initial formation parameter that front is set also need to obtain other relevant parameters,
Model and condition.In a specific embodiment, bottom pressure theoretical curve, bottom pressure can be drawn according to the following steps
Land theoretical curve and bottom pressure derivative theoretical curve:
S1: the initial condition parameters of shale gas reservoir and the wellbore parameters of shale gas reservoir are obtained；
S2: the initial stratum of the initial condition parameters of shale gas reservoir, the wellbore parameters of shale gas reservoir and shale gas reservoir is joined
Parameter sets of the number as shale gas reservoir；
S3: the flow model of shale gas reservoir is established；
S4: pit shaft type, production method and the working condition of shale gas reservoir are determined；
S5: according to parameter sets, carrying out simulation calculating using flow model, pit shaft type, production method and working condition,
Obtain the bottom pressure of shale gas reservoir；
S6: according to bottom pressure, drafting obtains bottom pressure theoretical curve, bottom pressure landing theoretical curve and shaft bottom pressure
Power derivative theoretical curve.
That is, in order to enable obtained bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative
Theoretical curve is more proper, during drafting, has also used the initial condition parameters of shale gas reservoir, the pit shaft of shale gas reservoir
Parameter, the initial formation parameter of shale gas reservoir, the flow model of shale gas reservoir, the pit shaft type of shale gas reservoir, production method and
Working condition etc..Because participating in, the parameter for calculating and drawing is more, so that it is more proper actual to draw obtained curve
Formation conditions.
It should be noted that the formation parameter in order to obtain and determined using quasi- straightway shale gas reservoir, is considered
Adsorbed gas is added in the earth formation, to determine formation parameter using the correlation properties having in shale gas adsorption and desorption, institute
To need to establish the flow model for the shale gas reservoir that can simultaneously obtain quasi- straightway with above-mentioned characteristic.Specifically, establishing above-mentioned reality
The process for applying the flow model of the shale gas reservoir in mode may include: according to apparent permeability formula and Darcy's law to shale gas
The initial flow model of hiding is modified, and is repaired the initial flow model of revised shale gas reservoir as the first of shale gas reservoir
Positive model；By establishing single-component gas adsorption equation, the first correction model of shale gas reservoir is adjusted, shale gas is obtained
Second correction model of hiding；According to the principle of mass conservation, the second correction model of shale gas reservoir is adjusted, will be obtained after adjustment
Flow model of second correction model of the shale gas reservoir arrived as shale gas reservoir.
The flow model for the shale gas reservoir established through the above steps, due to considering shale gas adsorption and desorption
When characteristic, therefore quasi- straightway can be obtained, to can use in subsequent processing step through the shale gas reservoir
Flow model obtains bottom pressure theoretical curve, bottom pressure derivative theoretical curve and bottom pressure landing theoretical curve, then root
It solves to obtain quasi- straightway according to above-mentioned curve.
Darcy's law in above-described embodiment is linear between the percolation flow velocity and hydraulic slope of water in description saturated soil
The rule of relationship, also known as linear seepage flow law.That is seepage discharge Q is with upstream and downstream head difference (h2-h1) and perpendicular to water (flow) direction
Sectional area A is directly proportional, and is inversely proportional with seepage flow length L, it may be assumed that Q=K*A* (h2-h1)/L.Q is unit time seepage discharge, F in formula
For the cross-section of river, h is gross head loss, and L is percolation path length, and I=h/L is hydraulic gradient, and K is infiltration coefficient.Relational expression
Show that water is inversely proportional within the unit time by the seepage discharge of porous media and percolation path length, with discharge section area and
Gross head loss is directly proportional.From hydraulics it is known that being equal to the product of flow velocity v and cross-section of river F by the flow Q of a certain section,
That is Q=Fv.This law illustrate water by the speed of porous media with the size of hydraulic gradient and the permeance property of medium at just
Than.However, the law is not fully suitable for the flow model of the shale gas reservoir of actual treatment, it is therefore desirable in conjunction with apparent permeability
The first correction model is obtained, but since there is also deficiencies for above-mentioned first correction model, so also needing further to be repaired
Positive processing, finally obtains the flow model of shale gas reservoir used in the embodiment of the present invention.
Step 103: theoretical bent according to bottom pressure theoretical curve, bottom pressure landing theoretical curve, bottom pressure derivative
Line, bottom pressure measured curve, bottom pressure landing measured curve and bottom pressure derivative measured curve are obtained by fitting
Fitting result；
In order to obtain required fitting result by fitting, step 103 be can specifically include:
S1: it according to bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative theoretical curve, obtains
Take theoretical pressure difference and theoretical pressure derivative；
S2: according to theoretical pressure difference and theoretical pressure derivative, the double-log of theoretical pressure difference and theoretical pressure derivative is drawn
Figure；
S3: it according to bottom pressure measured curve, bottom pressure landing measured curve and bottom pressure derivative measured curve, obtains
Take observed pressure difference and observed pressure derivative；
S4: according to observed pressure difference and observed pressure derivative, the double-log of observed pressure difference and observed pressure derivative is drawn
Figure；
S5: by pair of the log-log graph and observed pressure difference of theoretical pressure difference and theoretical pressure derivative and observed pressure derivative
Logarithmic chart is fitted, and obtains fitting result.
It should be noted that the fitting in above-mentioned steps is actually pair by theoretical pressure difference and theoretical pressure derivative
The log-log graph of logarithmic chart and observed pressure difference and observed pressure derivative is compared fitting, and it is exactly above-mentioned for obtaining comparison result
Fitting result.
After obtaining specific fitting result by step 103, which is analyzed, can tentatively understand theoretical mould
Gap between quasi- result and measured result, and this gap be often initial formation parameter by initially setting up mostly with it is actual
There are caused by deviation between formation parameter.In order to be corrected to the initial formation parameter initially set up close to actual formation parameter,
It is contemplated that being correction foundation with the fitting result, initial formation parameter is adjusted, is wanted until fitting result reaches preset precision
It asks, specific analysis and processing can execute in the following way.
Step 104: if fitting result meets default required precision, initial formation parameter being determined as shale gas reservoir
Actual formation parameter；
Step 105: if fitting result is unsatisfactory for default required precision, according to the quasi- straightway of theoretical curve to initial
Formation parameter carries out one or many correct operations, until the fitting result obtained based on the initial formation parameter after correction is met
Required precision is preset, and the initial formation parameter after correction is determined as to the actual formation parameter of shale gas reservoir.
In a specific embodiment, above-mentioned correct operation specifically can be as shown in Figure 2, comprising:
Step 201: initial formation parameter being adjusted according to the quasi- straightway of theoretical curve, the initial stratum ginseng after being corrected
Number；
Step 202: according to the initial formation parameter after correction, being calculated by simulation, after obtaining the correction of shale gas reservoir
Bottom pressure, and draw correction after bottom pressure theoretical curve, after correction bottom pressure landing theoretical curve and correction after
Bottom pressure derivative theoretical curve；
Step 203: theoretical bent according to bottom pressure theoretical curve, bottom pressure landing theoretical curve, bottom pressure derivative
Line, bottom pressure measured curve, bottom pressure landing measured curve and bottom pressure derivative measured curve are obtained by fitting
Fitting result.
After the fitting result that initial formation parameter after obtaining based on correction obtains, then to judge whether the result meets default
Required precision illustrates to calculate by using the initial formation parameter after correction by simulation if meeting default required precision
The theoretical curve of acquisition differs smaller with measured curve, error within an acceptable range, thus may determine that in the step
Initial formation parameter after correction is actual formation parameter；If being unsatisfactory for default required precision, illustrate after correcting initially
There are also gaps between layer parameter and actual formation parameter, can repeat one or many similar correct operations, until
Last fitting result meets default required precision, and the initial formation parameter after at this moment again correcting last time is determined as reality
Formation parameter.
In above-described embodiment, when specific operation, in order to accurately and efficiently adjust initial formation parameter, after obtaining correction
Initial formation parameter, it is theoretical bent step 102 can be drawn into obtained bottom pressure theoretical curve, bottom pressure landing respectively
Line and bottom pressure derivative theoretical curve are compared with the homologous thread of actual measurement, using specific comparison result as foundation, there is needle
The specific corresponding parameter in initial formation parameter is adjusted to property, specific embodiment, which may is that, is respectively compared bottom pressure reason
By curve and bottom pressure measured curve, compares bottom pressure landing theoretical curve and bottom pressure landing measured curve, compare
Bottom pressure derivative theoretical curve and bottom pressure derivative survey theoretical curve, obtain comparison result；It is obtained according to above-mentioned steps
Comparison result, initial formation parameter is adjusted according to the length of the quasi- straightway of theoretical curve and position, at the beginning of after correct
Beginning formation parameter.
Explanation is needed exist for, for the shale gas reservoir of horizontal well, above-mentioned initial formation parameter generally may include but not
It is limited at least one of: adsorbs parameter, in-place permeability, skin factor, fracture half-length and porosity in stratum.However, being worth
It is noted that above-mentioned cited formation parameter is only a kind of schematic description, it is in order to better illustrate the present invention, in reality
During execution, can also include other corresponding horizontal well shale gas reservoirs formation parameter, can according to the actual situation into
Row is chosen, and the application is not construed as limiting this.
It in a specific embodiment, as the case may be can be for each specific ginseng in above-mentioned initial formation parameter
Number (that is, stratum absorption parameter, in-place permeability, skin factor, fracture half-length and porosity) is adjusted correspondingly respectively, from
And the formation parameter corrected, and then make set initial formation parameter gradually close to simultaneously by one or many corrections
It is approximately equal to actual formation parameter.It should be noted that the adjustment for each design parameter in above-mentioned formation parameter, according to
Different situations need to carry out different adjustment, just seep respectively for the stratum absorption parameter in initial formation parameter, stratum below
The specific adjustment mode of rate, skin factor, fracture half-length and porosity is specifically described respectively thoroughly.
1) parameter is adsorbed on adjustment stratum:
It is shorter than the quasi- straight line of bottom pressure landing measured curve in the quasi- length of straigh line of bottom pressure landing theoretical curve
In the case where segment length, then increase the stratum absorption parameter；It is big in the quasi- length of straigh line of bottom pressure landing theoretical curve
In the case where the quasi- length of straigh line of bottom pressure landing measured curve, then reduce stratum absorption parameter.
In the actual implementation process, bottom pressure drop is shorter in length than in the quasi- straightway of bottom pressure landing theoretical curve
In the case where the length of quasi- straightway for falling measured curve, mainly with the quasi- straightway of above-mentioned bottom pressure landing theoretical curve
The length degree for being shorter in length than the quasi- straightway of bottom pressure landing measured curve is foundation, can be according to preset ratio amplitude
Increase stratum and adsorb parameter, so that the length of the quasi- straightway of bottom pressure landing theoretical curve is landed as early as possible close to bottom pressure real
The length of the quasi- straightway of curve is surveyed, to quickly be adjusted rear satisfactory stratum absorption parameter.That is, working as bottom pressure
The degree of the length of the quasi- straightway for being shorter in length than bottom pressure landing measured curve of the quasi- straightway of landing theoretical curve is very
When big, then on the basis of parameter is adsorbed on initial stratum, significantly increase stratum and adsorb parameter；When bottom pressure landing is theoretical
When the degree very little of the length of the quasi- straightway for being shorter in length than bottom pressure landing measured curve of the quasi- straightway of curve, then exist
On the basis of initial stratum absorption parameter, increases stratum by a small margin and adsorb parameter.Similar, land in bottom pressure theoretical bent
It is specific to adjust in the case that the length of the quasi- straightway of line is longer than the length of the quasi- straightway of bottom pressure landing measured curve
When, when the length of the quasi- straightway of bottom pressure landing theoretical curve is longer than the quasi- straightway of bottom pressure landing measured curve
When the degree of length is very big, then on the basis of parameter is adsorbed on initial stratum, stratum absorption parameter is dramatically reduced；Work as shaft bottom
The length of the quasi- straightway of drop of pressure theoretical curve is longer than the journey of the length of the quasi- straightway of bottom pressure landing measured curve
When spending very little, then on the basis of parameter is adsorbed on initial stratum, reduces stratum by a small margin and adsorb parameter.Pass through above-mentioned specific reality
The adjustment of mode is applied, the stratum absorption parameter in initial formation parameter is quickly and effectively adjusted to realize.
It should be noted, however, that the above-mentioned cited specific adjustment mode to stratum absorption parameter is only that one kind is shown
The description of meaning property, being can also include being based on above embodiment during actually executing in order to better illustrate the present invention
Other feasible adjustment modes, can specifically be chosen according to the actual situation, the application is not construed as limiting this.
2) in-place permeability, skin factor and fracture half-length are adjusted
It is higher than the quasi- straight line of bottom pressure landing measured curve in the quasi- straight line fragment position of bottom pressure landing theoretical curve
In the case where fragment position, then increase in-place permeability, skin factor and fracture half-length；In the quasi- of bottom pressure landing theoretical curve
In the case where quasi- straight line fragment position of the straight line fragment position lower than bottom pressure landing measured curve, then reduce in-place permeability, table
The skin factor and fracture half-length.In the actual implementation process, similar to the adjustment side for adsorbing parameter in above embodiment to stratum
Formula, with the position of the position of the quasi- straightway of bottom pressure landing theoretical curve and the quasi- straightway of bottom pressure landing measured curve
Specific difference degree is foundation between setting, and is carried out respectively according to corresponding amplitude to in-place permeability, skin factor and fracture half-length
Adjustment.Specific embodiment may include: when the position of the quasi- straightway of bottom pressure landing theoretical curve is higher than bottom pressure
Land measured curve quasi- straightway position, and when above-mentioned difference degree is larger, then in initial in-place permeability, skin factor
On the basis of fracture half-length, significantly increase in-place permeability, skin factor and fracture half-length；It is managed when bottom pressure lands
It is higher than the position of the quasi- straightway of bottom pressure landing measured curve, and above-mentioned difference degree by the position of the quasi- straightway of curve
When smaller, then on the basis of initial in-place permeability, skin factor and fracture half-length, by a small margin increase in-place permeability,
Skin factor and fracture half-length；Equally, when the position of the quasi- straightway of bottom pressure landing theoretical curve is dropped lower than bottom pressure
Fall the position of the quasi- straightway of measured curve, and when above-mentioned difference degree is larger, then initial in-place permeability, skin factor and
On the basis of fracture half-length, in-place permeability, skin factor and fracture half-length is dramatically reduced；When bottom pressure landing is theoretical
The position of the quasi- straightway of curve lower than bottom pressure landing measured curve quasi- straightway position, and above-mentioned difference degree compared with
Hour, then on the basis of initial in-place permeability, skin factor and fracture half-length, reduce in-place permeability, table by a small margin
The skin factor and fracture half-length.By the adjustment of above-mentioned specific embodiment, stratum in initial formation parameter is permeated to realize
Rate, skin factor and fracture half-length quickly and effectively adjust.It should be noted, however, that specific to stratum cited by above-mentioned
Permeability, skin factor and the adjustment mode of fracture half-length are only a kind of schematic descriptions, be in order to better illustrate the present invention,
It can also include other feasible adjustment modes based on above embodiment during actually executing, it specifically can root
It is chosen according to actual conditions, the application is not construed as limiting this.
3) porosity is adjusted
According to bottom pressure land the quasi- straightway of theoretical curve position and bottom pressure landing measured curve it is quasi- straight
Segment positions appropriate adjustment porosity.When specific adjustment, it is contemplated that cause the quasi- straight of bottom pressure landing theoretical curve
It is had differences between the difference and preset threshold of the alternate position spike that the position of line segment and bottom pressure landing measured curve intend straightway
The reason of it is more complicated, need that the hole in initial formation parameter can be incrementally increased or reduced according to practical concrete condition
Degree, so that the position of the quasi- straightway of bottom pressure landing theoretical curve and bottom pressure landing measured curve intend the position of straightway
The difference of difference is set gradually close to preset threshold.To by the above-mentioned means, available and determining porosity at this moment is correction
The porosity in formation parameter afterwards.
In the actual implementation process, in addition to being permeated above by the stratum absorption parameter in initial formation parameter, stratum
Rate, skin factor, fracture half-length and porosity are adjusted, can also be to other outside the initial formation parameter after being corrected
Parameter is adjusted, such as: boundary parameter etc..When it is implemented, can be bent according to above-mentioned three theoretical curves and three actual measurements
The extent of deviation of line, correspondingly gradually adjusts boundary parameter, so that above-mentioned three theoretical curves move closer to corresponding three realities
Curve is surveyed, until the deviation of above-mentioned three theoretical curves and corresponding measured curve is within an acceptable range, is then determined at this time
Boundary parameter, and by above-mentioned boundary parameter be included in correction after initial formation parameter in.
In embodiments of the present invention, by according to bottom pressure land theoretical curve quasi- straightway length and position pair
Parameters are pointedly corrected in the initial formation parameter of set shale gas reservoir, are determined and are met default required precision
Initial formation parameter after correction is actual formation parameter, the processing of the relatively cumbersome complexity of existing method is avoided, to solve
Determine that shale gas reservoir formation parameter cumbersome, the determination process technology that time-consuming are asked present in unstable state well-logging method
Topic has achieved the purpose that quick, accurate determining horizontal well shale gas reservoir formation parameter.
Based on the same inventive concept, a kind of determining horizontal well shale gas reservoir formation parameter is additionally provided in the embodiment of the present invention
System, as described in the following examples.The principle solved the problems, such as due to the system for determining horizontal well shale gas reservoir formation parameter
It is similar to horizontal well shale gas reservoir formation parameter method is determined, it is thus determined that the implementation of the system of shale gas reservoir formation parameter can be with
Referring to the implementation for determining horizontal well shale gas reservoir formation parameter method, overlaps will not be repeated.It is used below, term
The combination of the software and/or hardware of predetermined function may be implemented in " unit " or " module ".Although described in following embodiment
Device is preferably realized with software, but the realization of the combination of hardware or software and hardware is also that may and be contemplated.
Fig. 3 is a kind of structural block diagram of the system of the determination horizontal well shale gas reservoir formation parameter of the embodiment of the present invention, as shown in figure 3,
The system for determining horizontal well shale gas reservoir formation parameter may include: initial setting module 301, simulation calculation module 302, fitting
Module 303 and determining module 304, the modules of 3 pairs of structures are specifically described with reference to the accompanying drawing.
Initial setting module 301, for setting the initial formation parameter of horizontal well shale gas reservoir；
Simulation calculation module 302 obtains the shaft bottom pressure of shale gas reservoir for carrying out simulation calculating according to initial formation parameter
Power, and according to bottom pressure, it is theoretical to draw bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative
Curve；
Fitting module 303, for being fallen according to bottom pressure theoretical curve, bottom pressure landing theoretical curve, bottom pressure
Number theoretical curve, bottom pressure measured curve, bottom pressure landing measured curve and bottom pressure derivative measured curve, are intended
It closes, obtains fitting result；
Determining module 304, if fitting result meets default required precision, for initial formation parameter to be determined as page
The actual formation parameter of rock gas reservoir；If fitting result is unsatisfactory for default required precision, for according to shaft bottom theoretical curve
Quasi- straightway carries out one or many correct operations to initial formation parameter, obtains until based on the initial formation parameter after correction
Fitting result meet default required precision, and the initial formation parameter after correction is determined as to the reality of horizontal well shale gas reservoir
Formation parameter.
In the specific implementation process, simulation calculation module 302 is specifically used for: obtain shale gas reservoir initial condition parameters and
The wellbore parameters of shale gas reservoir；Then by the initial condition parameters of shale gas reservoir, the wellbore parameters and shale gas reservoir of shale gas reservoir
Parameter sets of the initial formation parameter as shale gas reservoir；Resettle the flow model of shale gas reservoir；Shale gas reservoir is determined again
Pit shaft type, production method and working condition；Then according to parameter sets, flow model, pit shaft type, production method are utilized
Simulation calculating is carried out with working condition, obtains the bottom pressure of shale gas reservoir；The bottom pressure that last basis obtains, and then draw
Obtain bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative theoretical curve.
It should be noted that in order to establish the flow model of the shale gas reservoir comprising shale gas adsorption and desorption characteristic,
Above-mentioned simulation calculation module 304 may include: according to apparent permeability public affairs in the process for the flow model for specifically establishing shale gas reservoir
Formula and Darcy's law are modified the initial flow model of shale gas reservoir, by the initial flow model of revised shale gas reservoir
The first correction model as shale gas reservoir；By establishing single-component gas adsorption equation, mould is corrected to the first of shale gas reservoir
Type is adjusted, and obtains the second correction model of shale gas reservoir；According to the principle of mass conservation, mould is corrected to the second of shale gas reservoir
Type is adjusted, using the second correction model of the shale gas reservoir obtained after adjustment as the flow model of shale gas reservoir.Thus can
With according to the flow model of the shale gas reservoir, can obtain in the next steps has with characteristic when shale gas adsorption and desorption
The quasi- straightway closed.
It needs to intend by correct operation if fitting result is unsatisfactory for default required precision in specific implementation process
It closes result and meets default required precision.That is: length and position pair of the determining module 304 according to the quasi- straightway of shaft bottom theoretical curve
Initial formation parameter carries out one or many correct operations, until the fitting result obtained based on the initial formation parameter after correction
Meet default required precision, and the initial formation parameter after correction is determined as to the actual formation parameter of shale gas reservoir.Wherein, on
The correct operation stated is mainly to be adjusted just by correction module 304 according to the length of the quasi- straightway of well theoretical curve and position
Beginning formation parameter, the initial formation parameter after being corrected；Further according to the initial formation parameter after correction, calculated by simulation,
Bottom pressure after obtaining the correction of shale gas reservoir, and draw the bottom pressure theoretical curve after correction, the pressure of the shaft bottom after correction
Bottom pressure derivative theoretical curve after power landing theoretical curve and correction；Finally by after correction bottom pressure theoretical curve and
After bottom pressure landing theoretical curve and bottom pressure landing measured curve, correction after bottom pressure measured curve, correction
Bottom pressure derivative theoretical curve and bottom pressure derivative measured curve are fitted compare respectively, obtain based on first after correction
The fitting result that beginning formation parameter obtains.
Wherein it should be noted that the length of the quasi- straightway according to shaft bottom theoretical curve in above-mentioned implementation process and position
The initial formation parameter of adjustment is set, the initial formation parameter after being corrected specifically can be and be respectively compared the theoretical song of bottom pressure
Line and bottom pressure measured curve, bottom pressure landing theoretical curve and bottom pressure landing measured curve, bottom pressure derivative
Theoretical curve and bottom pressure derivative survey theoretical curve, obtain comparison result；It is theoretical bent according to shaft bottom using the comparison result
The length of the quasi- straightway of line and position, pointedly adjust the design parameter in initial formation parameter, first after being corrected
Beginning formation parameter.
In actual implementation process, initial formation parameter is adjusted by determining module 304, after being corrected initially
Layer parameter, wherein the module generally as the case may be in initial formation parameter stratum absorption parameter, in-place permeability,
This 5 class parameter of skin factor, fracture half-length and porosity is adjusted.Lower determining module 304 be following is a brief introduction of to above-mentioned several
The specific adjustment process of class parameter.
In a specific embodiment, in order to quickly and efficiently adjust initial formation parameter, include in initial formation parameter
In the case that parameter is adsorbed on stratum, determining module 304 is according to the comparison result of theoretical curve and measured curve, to formation parameter
Adjustment generally may include: that be shorter than bottom pressure landing actual measurement bent in the quasi- length of straigh line of bottom pressure landing theoretical curve
In the case where the quasi- length of straigh line of line, then reduce the stratum absorption parameter；In the quasi- straight of bottom pressure landing theoretical curve
In the case that line segment length is greater than the quasi- length of straigh line of bottom pressure landing measured curve, then increase stratum absorption parameter.
In a specific embodiment, in order to quickly and efficiently adjust initial formation parameter, include in initial formation parameter
In the case where in-place permeability, skin factor and fracture half-length, determining module 304 is according to comparison result, to in-place permeability, table
The adjustment of the skin factor and fracture half-length, generally may include: bottom pressure landing theoretical curve quasi- straight line fragment position be higher than
In the case where the quasi- straight line fragment position of bottom pressure landing measured curve, then increase in-place permeability, skin factor and crack half
It is long；It is lower than the quasi- straight line fragment position of bottom pressure landing measured curve in the quasi- straight line fragment position of bottom pressure landing theoretical curve
In the case where, then reduce in-place permeability, skin factor and fracture half-length.
In a specific embodiment, in order to quickly and efficiently adjust initial formation parameter, include in initial formation parameter
In the case where porosity, determining module 304 is according to comparison result, and adjustment to porosity generally may include: to be pressed according to shaft bottom
The position of the quasi- straightway of power landing theoretical curve and the quasi- straightway location-appropriate adjusting hole of bottom pressure landing measured curve
Porosity.
In the actual implementation process, determining module 304 is in addition to can be through the above way respectively in initial formation parameter
Stratum absorption parameter, in-place permeability, skin factor, fracture half-length and porosity be adjusted, it is initial after being corrected
Outside formation parameter, determining module 304 can also be set, boundary parameter is adjusted.When it is implemented, determining module 304 can be with
According to the extent of deviation of three theoretical curves and three measured curves, boundary parameter is correspondingly gradually adjusted, so that three theories
Curve moves closer to corresponding three measured curves, until the deviation of three theoretical curves and corresponding measured curve is acceptable
In range, boundary parameter at this time is determined, and the boundary parameter is included in the initial formation parameter after correction.
It can be seen from the above description that the embodiment of the present invention realizes following technical effect: by according to theoretical bent
The length of the quasi- straightway of line and position to the design parameter in the set initial formation parameter of shale gas reservoir pointedly into
Row correction is solved to determine the actual formation parameter of horizontal well shale gas reservoir using true present in unstable state well-logging method
Determine the trouble of determination process existing for shale gas reservoir formation parameter, determination process the technical issues of time-consuming, reached quickly, it is accurate
Determine the purpose of horizontal well shale gas reservoir formation parameter；In order to obtain quasi- straightway, the embodiment of the present invention is in original stratigraphic model
In joined adsorbed gas, it is specific that shale gas is established according to apparent permeability formula, Darcy's law and one-component gas absorption formula again
The flow model of hiding, so as to obtain and using the correlation properties of quasi- straightway, realize based on pressure to shale gas reservoir
The short time of layer parameter identifies；In view of the characteristic that horizontal well itself has, according to the length of quasi- straightway and position, specific aim
Ground adjust horizontal well shale gas reservoir formation parameter in design parameter, i.e., stratum absorption parameter, in-place permeability, skin factor,
Fracture half-length and porosity, realization are quickly and effectively adjusted and are corrected to each design parameter in initial formation parameter, so as to
To quickly determine actual formation parameter.
Obviously, those skilled in the art should be understood that each module of the above-mentioned embodiment of the present invention or each step can be with
It is realized with general computing device, they can be concentrated on a single computing device, or be distributed in multiple computing devices
On composed network, optionally, they can be realized with the program code that computing device can perform, it is thus possible to by it
Store and be performed by computing device in the storage device, and in some cases, can be held with the sequence for being different from herein
The shown or described step of row, perhaps they are fabricated to each integrated circuit modules or will be multiple in them
Module or step are fabricated to single integrated circuit module to realize.In this way, the embodiment of the present invention be not limited to it is any specific hard
Part and software combine.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the embodiment of the present invention can have various modifications and variations.All within the spirits and principles of the present invention, made
Any modification, equivalent substitution, improvement and etc. should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of method of determining horizontal well shale gas reservoir formation parameter characterized by comprising
Set the initial formation parameter of horizontal well shale gas reservoir；
Simulation calculating is carried out according to the initial formation parameter, obtains the bottom pressure of the shale gas reservoir, and according to the well
Bottom pressure draws bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative theoretical curve；
It is theoretical bent according to the bottom pressure theoretical curve, bottom pressure landing theoretical curve, the bottom pressure derivative
Line, bottom pressure measured curve, bottom pressure landing measured curve and bottom pressure derivative measured curve are obtained by fitting
Fitting result；
If the fitting result meets default required precision, the initial formation parameter is determined as the shale gas reservoir
Actual formation parameter；
If the fitting result is unsatisfactory for default required precision, according to the quasi- straightway of theoretical curve to the initial stratum
Parameter carries out one or many correct operations, meet until the fitting result obtained based on the initial formation parameter after correction described in
Required precision is preset, and the initial formation parameter after correction is determined as to the actual formation parameter of the shale gas reservoir；
Wherein, simulation calculating is carried out according to the initial formation parameter, obtains the bottom pressure of the shale gas reservoir, and according to institute
Bottom pressure is stated, bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative theoretical curve, packet are drawn
It includes:
Obtain the initial condition parameters of the shale gas reservoir and the wellbore parameters of the shale gas reservoir；
Initially by the initial condition parameters of the shale gas reservoir, the wellbore parameters of the shale gas reservoir and the shale gas reservoir
Parameter sets of the layer parameter as the shale gas reservoir；
Establish the flow model of the shale gas reservoir；
Determine pit shaft type, production method and the working condition of the shale gas reservoir；
According to the parameter sets, the flow model, the pit shaft type, the production method and the working condition are utilized
Simulation calculating is carried out, the bottom pressure of the shale gas reservoir is obtained；
According to the bottom pressure, drafting obtain the bottom pressure theoretical curve, bottom pressure landing theoretical curve and
The bottom pressure derivative theoretical curve.
2. the method according to claim 1, wherein establishing the flow model of the shale gas reservoir, comprising:
The initial flow model of the shale gas reservoir is modified according to apparent permeability formula and Darcy's law, it will be revised
First correction model of the initial flow model of shale gas reservoir as the shale gas reservoir；
By establishing single-component gas adsorption equation, the first correction model of the shale gas reservoir is adjusted, is obtained described
Second correction model of shale gas reservoir；
According to the principle of mass conservation, the second correction model of the shale gas reservoir is adjusted, described in being obtained after adjustment
Flow model of second correction model of shale gas reservoir as the shale gas reservoir.
3. the method according to claim 1, wherein described according to the bottom pressure theoretical curve, the well
Bottom pressure landing theoretical curve, the bottom pressure derivative theoretical curve, bottom pressure measured curve, bottom pressure landing actual measurement
Curve and bottom pressure derivative measured curve obtain fitting result by fitting, comprising:
It is theoretical bent according to the bottom pressure theoretical curve, bottom pressure landing theoretical curve and the bottom pressure derivative
Line obtains theoretical pressure difference and theoretical pressure derivative；
According to the theoretical pressure difference and the theoretical pressure derivative, the double-log of theoretical pressure difference and theoretical pressure derivative is drawn
Figure；
It is bent according to the bottom pressure measured curve, bottom pressure landing measured curve and bottom pressure derivative actual measurement
Line obtains observed pressure difference and observed pressure derivative；
According to the observed pressure difference and the observed pressure derivative, the double-log of observed pressure difference and observed pressure derivative is drawn
Figure；
By the log-log graph and the observed pressure difference of the theoretical pressure difference and theoretical pressure derivative and observed pressure derivative
Log-log graph is fitted, and obtains the fitting result.
4. the method according to claim 1, wherein the quasi- straightway according to theoretical curve is to described initial
Formation parameter carries out one or many correct operations, comprising:
The initial formation parameter is adjusted according to the quasi- straightway of the theoretical curve, the initial formation parameter after being corrected；
It according to the initial formation parameter after the correction, is calculated by simulation, the shaft bottom after obtaining the correction of the shale gas reservoir
Pressure, and draw the well after the bottom pressure theoretical curve after correction, the landing theoretical curve of the bottom pressure after correction and correction
Bottom pressure derivative theoretical curve；
It is theoretical bent according to the bottom pressure theoretical curve, bottom pressure landing theoretical curve, the bottom pressure derivative
Line, the bottom pressure measured curve, bottom pressure landing measured curve and the bottom pressure derivative measured curve, lead to
Over-fitting obtains fitting result.
5. according to the method described in claim 4, it is characterized in that, described just according to the adjustment of the quasi- straightway of the theoretical curve
Beginning formation parameter, the initial formation parameter after being corrected, comprising:
It is respectively compared the bottom pressure theoretical curve and the bottom pressure measured curve, the bottom pressure landing is theoretical bent
Line and bottom pressure landing measured curve, the bottom pressure derivative theoretical curve and bottom pressure derivative actual measurement reason
By curve, comparison result is obtained；
According to the quasi- straightway of the comparison result and the theoretical curve, the initial formation parameter is adjusted, after obtaining correction
Initial formation parameter.
6. according to the method described in claim 5, it is characterized in that, the initial formation parameter includes at least one of: ground
Layer absorption parameter, in-place permeability, skin factor, fracture half-length and porosity.
7. according to the method described in claim 6, it is characterized in that, including the stratum absorption ginseng in the initial formation parameter
In the case where number, according to the comparison result, the formation parameter is adjusted, comprising:
It is shorter than the quasi- of the bottom pressure landing measured curve in the quasi- length of straigh line of bottom pressure landing theoretical curve
In the case where length of straigh line, then increase the stratum absorption parameter；
It is longer than the quasi- of the bottom pressure landing measured curve in the quasi- length of straigh line of bottom pressure landing theoretical curve
In the case where length of straigh line, then reduce the stratum absorption parameter.
8. according to the method described in claim 6, it is characterized in that, including at least one of in the initial formation parameter:
In the case where the in-place permeability, the skin factor and the fracture half-length, according to the comparison result, corresponding adjustment institute
State in-place permeability, the skin factor and the fracture half-length, comprising:
It is higher than the quasi- of bottom pressure landing measured curve in the quasi- straight line fragment position of bottom pressure landing theoretical curve
In the case where straight line fragment position, then increase the in-place permeability, the skin factor and the fracture half-length；
It is quasi- lower than bottom pressure landing measured curve in the quasi- straight line fragment position of bottom pressure landing theoretical curve
In the case where straight line fragment position, then reduce the in-place permeability, the skin factor and the fracture half-length.
9. according to the method described in claim 6, it is characterized in that, including the feelings of the porosity in the initial formation parameter
Under condition, according to the comparison result, the porosity is adjusted, comprising:
According to the bottom pressure land the quasi- straightway of theoretical curve position and bottom pressure landing measured curve
The position of quasi- straightway adjusts the porosity.
10. a kind of system of determining horizontal well shale gas reservoir formation parameter characterized by comprising
Initial setting module, for setting the initial formation parameter of horizontal well shale gas reservoir；
Simulation calculation module obtains the shaft bottom of the shale gas reservoir for carrying out simulation calculating according to the initial formation parameter
Pressure, and according to the bottom pressure, it draws bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure and leads
Number theoretical curve；
Fitting module, for being pressed according to the bottom pressure theoretical curve, bottom pressure landing theoretical curve, the shaft bottom
Power derivative theoretical curve, bottom pressure measured curve, bottom pressure landing measured curve and bottom pressure derivative measured curve, lead to
Over-fitting obtains fitting result；
Determining module, if the fitting result meets default required precision, for the initial formation parameter to be determined as
The actual formation parameter of the shale gas reservoir；If the fitting result is unsatisfactory for default required precision, for according to theory
The quasi- straightway of curve carries out one or many correct operations to the initial formation parameter, after based on correction initially
The fitting result that layer parameter obtains meets the default required precision, and the initial formation parameter after correction is determined as the page
The actual formation parameter of rock gas reservoir；
Wherein, simulation calculation module is specifically used for: obtain the shale gas reservoir initial condition parameters and the shale gas reservoir
Wellbore parameters；By the initial condition parameters of the shale gas reservoir, the wellbore parameters of the shale gas reservoir and the shale gas reservoir
Initial parameter sets of the formation parameter as the shale gas reservoir；Establish the flow model of the shale gas reservoir；Determine the page
Pit shaft type, production method and the working condition of rock gas reservoir；According to the parameter sets, the flow model, the well are utilized
Cylinder type, the production method and the working condition carry out simulation calculating, obtain the bottom pressure of the shale gas reservoir；According to
The bottom pressure, drafting obtain the bottom pressure theoretical curve, bottom pressure landing theoretical curve and the shaft bottom
Pressure derivative theoretical curve.
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| CN107679338B (en) * | 2017-10-20 | 2021-03-19 | 合肥工业大学 | Reservoir fracturing effect evaluation method and evaluation system based on flowback data |
| CN109958429B (en) * | 2017-12-21 | 2021-10-22 | 中国石油化工股份有限公司 | Method for judging shale gas adsorption gas output |
| CN108982817B (en) * | 2018-08-28 | 2020-04-21 | 中国科学院力学研究所 | Shale gas content evaluation method based on methane carbon isotope |
| CN109184661B (en) * | 2018-09-11 | 2022-03-08 | 中海石油(中国)有限公司 | Monitoring method and system for identifying high-yield liquid position of bottom water reservoir horizontal well |
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