CN108612525A - A kind of gas reservoir protection Reserve Estimation Method - Google Patents
A kind of gas reservoir protection Reserve Estimation Method Download PDFInfo
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Abstract
The present invention for existing gas reservoir protection Reserve Estimation Method there are data shortcoming, use condition is harsh or analytic process is complicated the problems such as, the advantages of based on material balance method, in conjunction with gas flow process, comprehensive Particle in Vertical Pipe Flow model, Gas Well Productivity and matter balance equation, disclose a kind of gas reservoir protection Reserve Estimation Method.This method includes the following steps：S1, prepare Production development data；S2, flowing bottomhole pressure (FBHP) is calculated：According to the gas well liquid loading dynamic data after arrangement, gas well flowing bottomhole pressure (FBHP) is calculated；S3, stratum static pressure is calculated：Using gas well binomial potential curve and equation, Gas Well Average Formation Pressure is calculated；S4, flowing stage is divided：Determine boundary Control flowing stage, flow instabilities stage, transition stage；S5, dynamic holdup is calculated：The dynamic holdup after the gas well flow instabilities stage is calculated, is added with the cumulative gas production in flow instabilities stage, obtains the true dynamic holdup of gas well.
Description
Technical field
The present invention relates to a kind of gas reservoir protection Reserve Estimation Methods, more particularly to a kind of gas reservoir protection reserves calculating side
Method.
Background technology
Gas reservoir protection reserves refer to total tolerance that flowing is participated in reservoir.The accurate gas reservoir protection reserves that calculate are correctly to evaluate
Gas reservoir development effect, Accurate Prediction gas reservoir development dynamic, the important prerequisite for carrying out gas reservoir development planning.Currently, it is dynamic to calculate gas reservoir
The method of state reserves includes mainly material balance method (pressure decline method), flowing material balance method and the unstable analytic approach of yield etc..Object
Matter balancing method is to calculate that gas reservoir protection reserves are the most accurate and reliable method, but need periodically to carry out prolonged full gas reservoir to close
Well pressure measurement.Initially lamination when flowing material balance method requires gas well yield stable and necessary known accurate gas well is gone into operation
Power.The practical use condition for being difficult to meet material balance method and flowing material balance method of gas reservoir development.The unstable analytic approach of yield
It is a kind of well test analysis method based on creation data, there is good adaptability to the continually changing situation of gas well yield, be
Calculating Estimation of Gas Well Dynamic Reserves generally acknowledged at present more accurately and reliably a kind of method, but its analytic process is complex, need to be by
Professional software is analyzed.
Invention content
The present invention is complicated for existing gas reservoir protection Reserve Estimation Method data shortcoming, use condition harshness or analytic process
The problems such as, the advantages of being based on material balance method, in conjunction with gas flow process, comprehensive Particle in Vertical Pipe Flow model, Gas Well Productivity and
Matter balance equation proposes a kind of gas reservoir protection Reserve Estimation Method.
The object of the present invention is achieved like this：
A kind of gas reservoir protection Reserve Estimation Method, this method include the following steps：
S1, prepare Production development data：Gas well liquid loading dynamic data is obtained, the gas well liquid loading dynamic data includes gas well
It produces tolerance daily, rejects the Production development data of well shut-in period, and will produce gas well conversion of the time less than 24 hours daily is 24 hours
Produce tolerance daily；
S2, flowing bottomhole pressure (FBHP) is calculated：According to the gas well liquid loading dynamic data after arrangement, Particle in Vertical Pipe Flow model is chosen, calculates gas
Well flowing bottomhole pressure (FBHP)；
S3, Gas Well Average Formation Pressure is calculated：The flowing bottomhole pressure (FBHP) obtained by gas well daily output tolerance and S2 obtained by S1, is adopted
With gas well binomial potential curve and equation, Gas Well Average Formation Pressure is calculated；
S4, flowing stage is divided：Tolerance accumulation read group total is produced daily according to gas well obtains cumulative gas production and S3 calculating
Obtained mean reservoir pressure draws Gas Well Average Formation Pressure and regards pressure and cumulative gas production relation curve, determines side successively
Boundary controls flowing stage, the transition stage in flow instabilities stage, flow instabilities stage to boundary Control flowing stage；
S5, dynamic holdup is calculated：According to the data of boundary Control flowing stage, straight line is determined using linear regression analysis
Slope and intercept, and then the Estimation of Gas Well Dynamic Reserves after the calculating gas well flow instabilities stage, with the flow instabilities stage
Cumulative gas production is added, and obtains the true dynamic holdup of gas well.
Preferably, in S1, the gas well liquid loading dynamic data further includes well head pressure and wellhead temperature.
Preferably, in S2, the computational methods of flowing bottomhole pressure (FBHP) are as follows：
It chooses Particle in Vertical Pipe Flow model and calculates gas well flowing bottomhole pressure (FBHP), the wellbore pressure gradient computation model in Particle in Vertical Pipe Flow model
Universal expression is as follows：
In formula：
For wellbore pressure gradient, units MPa/m；
For friction pressure gradient, units MPa/m；
Attach most importance to a barometric gradient, units MPa/m；
For acceleration barometric gradient, units MPa/m.
Preferably, in S3, the computational methods of Gas Well Average Formation Pressure are as follows：
Using the binomial potential curve and equation determined by backpressure test, Gas Well Average Formation Pressure is calculated, is calculated
Mean reservoir pressure be stratum static pressure after closing well restores, gas well binomial potential curve and equation is as follows：
In formula：
ψ (p) is Gas Well Average Formation Pressure, units MPa2/(mPa·s)；
ψ(pwf) be flowing bottomhole pressure (FBHP) pseudopressure, units MPa2/(mPa·s)；
qscTolerance, unit 10 are produced daily for gas well4m3/d；
A, b are binomial potential curve and equation coefficient.
Preferably, in S5, according to material balance equation for gas reservoir formula, the dynamic storage after gas well flow instabilities is calculated
Amount, material balance equation for gas reservoir formula are as follows：
In formula：
Initial pressure regards pressure, units MPa when going into operation for gas well；
Pressure, units MPa are regarded for mean reservoir pressure；
GpFor gas well cumulative gas production, unit 108m3；
GbdfFor the Estimation of Gas Well Dynamic Reserves after the flow instabilities stage, unit 108m3。
The true dynamic holdup calculation formula of gas well is as follows：
In formula：
ttrnFor the flow instabilities time；
qsc(t) it is gas well instant productivity, unit 104m3/d；
GtrnFor flow instabilities stage gas well cumulative gas production, unit 108m3；
GbdfFor Estimation of Gas Well Dynamic Reserves, unit 108m3。
Preferably, in S5, after gas is flowed completely into boundary Control flowing stage, Gas Well Average Formation Pressure regards pressure
Power is on a declining curve and Gas Well Average Formation Pressure regards pressure and cumulative gas production relation curve is in linear relation, and early stage is unstable
This straight line can then be deviated considerably from by determining the data of flowing stage, determine that gas flows into the time of boundary Control stream according to this, into
And the data in flow instabilities stage early stage are rejected from regression analysis data.
By adopting the above-described technical solution, the present invention has the advantages that：
(1) the present invention is based on gas well flow-datas to determine Estimation of Gas Well Dynamic Reserves, need not periodically carry out prolonged full gas
It hides closing well and surveys gas well recovery pressure, solve the problems, such as that data is short of material balance method in application process.New method sheet
It is still in matter and determines Estimation of Gas Well Dynamic Reserves with material balance equation for gas reservoir, thus it is accurate to inherit material balance method result of calculation
Advantage really reliable, calculating process is simple, while also effectively overcoming flowing material balance method use condition harshness and unstable
The problem of analytic approach calculating process complexity.The present invention realizes the accurate calculating of simplicity of gas reservoir protection reserves, this is to correctly evaluating
It gas reservoir development effect, Accurate Prediction gas reservoir development dynamic and carries out gas reservoir development planning and is of great significance.
(2) the actual calculation shows between context of methods result of calculation and unstable analytic approach result of calculation average value most
Big relative deviation is 4.40%, and minimum relative deviation is -0.07%, and relative deviation illustrates context of methods within ± 5.0%
Result of calculation is accurately and reliably.
Description of the drawings
Fig. 1 is the relation curve that P2011-3 well mean reservoir pressures regard pressure and cumulative gas；
Fig. 2 is P2011-3 well Blasingame typical curve plots fitting results；
Fig. 3 is P2011-3 well AG typical curve plots fitting results；
Fig. 4 is P2011-3 well NPI typical curve plots fitting results.
Specific implementation mode
A kind of gas reservoir protection Reserve Estimation Method, this method include the following steps：
S1, prepare Production development data：Gas well liquid loading dynamic data is obtained, the gas well liquid loading dynamic data includes gas well
It produces tolerance, well head pressure and wellhead temperature daily, for the needs that Particle in Vertical Pipe Flow model calculates, rejects the Production development of well shut-in period
Data, and gas well conversion of the time less than 24 hours will be produced daily for 24 hours daily output tolerance, to ensure the accuracy of result of calculation.
S2, flowing bottomhole pressure (FBHP) is calculated：According to the gas well liquid loading dynamic data after arrangement, suitable Particle in Vertical Pipe Flow equation is chosen,
Calculate gas well flowing bottomhole pressure (FBHP)；
In the present embodiment, the computational methods of flowing bottomhole pressure (FBHP) are as follows：
It chooses Particle in Vertical Pipe Flow model and calculates gas well flowing bottomhole pressure (FBHP), the wellbore pressure gradient computation model in Particle in Vertical Pipe Flow model
Universal expression is as follows：
In formula：
For wellbore pressure gradient, units MPa/m；
For friction pressure gradient, units MPa/m；
Attach most importance to a barometric gradient, units MPa/m；
For acceleration barometric gradient, units MPa/m.
S3, Gas Well Average Formation Pressure is calculated：The flowing bottomhole pressure (FBHP) obtained by gas well daily output tolerance and S2 obtained by S1, is adopted
With gas well binomial potential curve and equation, calculate Gas Well Average Formation Pressure (i.e. closing well restores static pressure)；
The computational methods of stratum static pressure are as follows：
Using the binomial potential curve and equation determined by backpressure test, Gas Well Average Formation Pressure is calculated, is calculated
Mean reservoir pressure be stratum static pressure after closing well restores, gas well binomial potential curve and equation is as follows：
In formula：
ψ (p) is Gas Well Average Formation Pressure, units MPa2/(mPa·s)；
ψ(pwf) be flowing bottomhole pressure (FBHP) pseudopressure, units MPa2/(mPa·s)；
qscTolerance, unit 10 are produced daily for gas well4m3/d；
A, b are binomial potential curve and equation coefficient.
S4, flowing stage is divided：The average stratum that air volume calculation obtains cumulative gas production, is calculated is produced daily according to gas well
Pressure, draws Gas Well Average Formation Pressure and regards pressure and cumulative gas production relation curve, determine successively boundary Control flowing stage,
The transition stage in flow instabilities stage, flow instabilities stage to boundary Control flowing stage；
S5, dynamic holdup is calculated：According to the data of boundary Control flowing stage, straight line is determined using linear regression analysis
Slope and intercept, and then the dynamic holdup after the calculating gas well flow instabilities stage, the accumulation with the flow instabilities stage
Gas production is added, and obtains the true dynamic holdup of gas well.
After gas is flowed completely into boundary Control flowing stage, according to material balance equation for gas reservoir formula, relation curve
For a straight line, the dynamic holdup after calculating gas well flow instabilities according to the slope of straight line and intercept, gas reservoirs balance
Equation is as follows：
In formula：
Initial pressure regards pressure, units MPa when going into operation for gas well；
Pressure, units MPa are regarded for mean reservoir pressure；
GpFor gas well cumulative gas production, unit 108m3；
GbdfFor the Estimation of Gas Well Dynamic Reserves after the flow instabilities stage, unit 108m3。
Since gas well binomial potential curve and equation is determined by productivity test, flowing bottomhole pressure (FBHP) is required to stablize when productivity test,
The gas well binomial potential curve and equation determined by productivity test represents boundary Control flowing stage mean reservoir pressure, flowing bottomhole pressure (FBHP)
Mathematical relationship between gas well yield.Therefore, only according to the production performance observation data for having been enter into boundary Control flowing stage
Determining dynamic holdup is only reliably.
After gas is flowed completely into boundary Control flowing stage, it is on a declining curve that Gas Well Average Formation Pressure regards pressure
And Gas Well Average Formation Pressure regards pressure and cumulative gas production relation curve is in linear relation, and flow instabilities stage early stage
Data can then deviate considerably from this straight line, can determine that gas flows into the time of boundary Control stream according to this, so as to help
The data by flow instabilities stage early stage are helped to be rejected from regression analysis data.
The intercept reflection obtained according to boundary Control flowing stage data regression is that gas flowing starts by shakiness
Constant current trend boundary Control flows mean reservoir pressure when transition, is not initial formation pressure when gas well is gone into operation.Thus
Dynamic holdup after being gas well flow instabilities using the dynamic holdup of above method regression analysis determination.Gas well is true
Dynamic holdup should also include cumulative gas production of the gas well in the flow instabilities stage, i.e.,：
In formula：
ttrnFor the flow instabilities time；
qsc(t) it is gas well instant productivity, unit 104m3/d；
GtrnFor flow instabilities stage gas well cumulative gas production, unit 108m3；
GbdfFor Estimation of Gas Well Dynamic Reserves, unit 108m3。
According to puguang gas field main body gas reservoir P2011-3 well production performance observation data, calculates and draw mean reservoir pressure
Depending on pressure and cumulative gas production relation curve (Fig. 1).Pressure is regarded according to mean reservoir pressure and cumulative gas production relation curve is true
After fixed 2 days March in 2011, completely into boundary Control flowing stage, August in 2010 was unstable before 14 days for gas flowing
Flowing stage, August in 2010 are transition stage of the non-stationary flow to boundary Control stream during 14 days~2 days March in 2011.According to
The data of boundary Control flowing stage determine the slope and intercept of straight line using linear regression analysis, calculate gas well non-stationary flow
Dynamic holdup after dynamic is 27.22 × 108m3, gas well flow instabilities stage cumulative gas production is 0.44 × 108m3, by
This determines that P2011-3 well performance reserves are 27.66 × 108m3.It is unstable using Blasingame methods, AG methods and NPI method Isoquants
Analytic approach calculates the dynamic holdup (Fig. 2~Fig. 4) of aforementioned P2011-3 wells, and Estimation of Gas Well Dynamic Reserves result of calculation is respectively 27.59 ×
108m3, 28.05 × 108m3With 28.28 × 108m3, average dynamic reserves 27.97 × 108m3。
From the point of view of Blasingame methods, AG methods and NPI method typical curve plots fitting results, gas well flowing completely into
The result of calculation of boundary Control flowing stage, the unstable analytic approach of yield is reliable.New method and the unstable analytic approach of yield
Determining P2011-3 well performance reserves are close, relative deviation -1.11%, illustrate that the result of calculation of new method is accurate and reliable
's.
Further to verify the accurate reliability of context of methods result of calculation, using identical analysis calculating process, analysis
Calculate the dynamic holdup (table 1) of the 9 implication wells such as puguang gas field main body gas reservoir P201-4.Come from Estimation of Gas Well Dynamic Reserves result of calculation
It sees, maximum relative deviation is 4.40% between context of methods result of calculation and unstable analytic approach result of calculation average value, minimum phase
It is -0.07% to deviation, relative deviation illustrates that the result of calculation of context of methods is accurately and reliably within ± 5.0%.
1 Estimation of Gas Well Dynamic Reserves result of calculation of table
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (6)
1. a kind of gas reservoir protection Reserve Estimation Method, which is characterized in that this method includes the following steps：
S1, prepare Production development data：Gas well liquid loading dynamic data is obtained, the gas well liquid loading dynamic data includes gas well daily output
Tolerance rejects the Production development data of well shut-in period, and will produce gas well conversion of the time less than 24 hours daily and produced daily for 24 hours
Tolerance；
S2, flowing bottomhole pressure (FBHP) is calculated：According to the gas well liquid loading dynamic data after arrangement, Particle in Vertical Pipe Flow model is chosen, calculates gas well well
Underflow pressure；
S3, Gas Well Average Formation Pressure is calculated：The flowing bottomhole pressure (FBHP) obtained by gas well daily output tolerance and S2 obtained by S1, using gas
Well binomial potential curve and equation calculates Gas Well Average Formation Pressure；
S4, flowing stage is divided：Cumulative gas production is obtained according to gas well daily output tolerance accumulation read group total and S3 is calculated
Mean reservoir pressure, draw Gas Well Average Formation Pressure and regard pressure and cumulative gas production relation curve, determine boundary control successively
Flowing stage processed, the transition stage in flow instabilities stage, flow instabilities stage to boundary Control flowing stage；
S5, dynamic holdup is calculated：According to the data of boundary Control flowing stage, the slope of straight line is determined using linear regression analysis
And intercept, and then the Estimation of Gas Well Dynamic Reserves after the calculating gas well flow instabilities stage, the accumulation with the flow instabilities stage
Gas production is added, and obtains the true dynamic holdup of gas well.
2. gas reservoir protection Reserve Estimation Method according to claim 1, which is characterized in that in S1, the gas well liquid loading is dynamic
State data further include well head pressure and wellhead temperature.
3. gas reservoir protection Reserve Estimation Method according to claim 1 or 2, which is characterized in that in S2, the meter of flowing bottomhole pressure (FBHP)
Calculation method is as follows：
It chooses Particle in Vertical Pipe Flow model and calculates gas well flowing bottomhole pressure (FBHP), the wellbore pressure gradient computation model in Particle in Vertical Pipe Flow model is general
It is expressed as follows：
In formula：
For wellbore pressure gradient, units MPa/m；
For friction pressure gradient, units MPa/m；
Attach most importance to a barometric gradient, units MPa/m；
For acceleration barometric gradient, units MPa/m.
4. gas reservoir protection Reserve Estimation Method according to claim 1, which is characterized in that in S3, gas well is fifty-fifty laminated
The computational methods of power are as follows：
Using the binomial potential curve and equation determined by backpressure test, Gas Well Average Formation Pressure is calculated, what is be calculated is flat
Equal strata pressure is the stratum static pressure after closing well restores, and gas well binomial potential curve and equation is as follows：
In formula：
ψ (p) is Gas Well Average Formation Pressure, units MPa2/(mPa·s)；
ψ(pwf) be flowing bottomhole pressure (FBHP) pseudopressure, units MPa2/(mPa·s)；
qscTolerance, unit 10 are produced daily for gas well4m3/d；
A, b are binomial potential curve and equation coefficient.
5. gas reservoir protection Reserve Estimation Method according to claim 1, which is characterized in that flat according to gas reservoirs in S5
Weigh equation, calculates the dynamic holdup after gas well flow instabilities, and material balance equation for gas reservoir formula is as follows：
In formula：
Initial pressure regards pressure, units MPa when going into operation for gas well；
Pressure, units MPa are regarded for mean reservoir pressure；
GpFor gas well cumulative gas production, unit 108m3；
GbdfFor the Estimation of Gas Well Dynamic Reserves after the flow instabilities stage, unit 108m3。
The true dynamic holdup calculation formula of gas well is as follows：
In formula：
ttrnFor the flow instabilities time；
qsc(t) it is gas well instant productivity, unit 104m3/d；
GtrnFor flow instabilities stage gas well cumulative gas production, unit 108m3；
GbdfFor Estimation of Gas Well Dynamic Reserves, unit 108m3。
6. gas reservoir protection Reserve Estimation Method according to claim 5, which is characterized in that in S5, when gas flowing is complete
Into after boundary Control flowing stage, Gas Well Average Formation Pressure is on a declining curve regarding pressure and Gas Well Average Formation Pressure regards pressure
Power and cumulative gas production relation curve are in linear relation, and the data in flow instabilities stage early stage can then deviate considerably from this directly
Line determines that gas flows into time of boundary Control stream according to this, and then by the data in flow instabilities stage early stage from recurrence
It is rejected in analysis data.
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