CN106846157A - Reserve evaluation method for steam huff and puff later stage under SEC (SEC-enhanced steam conditioning) criterion - Google Patents
Reserve evaluation method for steam huff and puff later stage under SEC (SEC-enhanced steam conditioning) criterion Download PDFInfo
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Abstract
The invention provides a reserve capacity evaluation method at the later stage of steam huff and puff under an SEC (SEC-enhanced steam conditioning) criterion. The method comprises the following steps: obtaining historical production data of a target block, and drawing a stage yield and time relation graph; obtaining a linear regression equation of the accumulated gasoline ratio and the accumulated gasoline yield according to a relation graph of the drawn accumulated gasoline yield and the accumulated gasoline ratio; collecting economic parameters of the target block to obtain an economic limit gasoline ratio and an economic limit yield of the target block; and obtaining the decrement rate of the target block through a linear regression equation of the cumulative gasoline ratio and the cumulative oil yield, the economic limit gasoline ratio and the economic limit yield, and estimating the reserve of the target block by adopting an exponential subtraction method according to the decrement rate of the target block to finish the estimation of the reserve at the later stage of the steam throughput under the SEC criterion of the target block. The result obtained by the method for evaluating the reserve capacity at the later stage of steam throughput under the SEC criterion is more practical.
Description
Technical field
The present invention relates to a kind of a kind of Reserves Assessment side in steam soak later stage under appraisal procedure, more particularly to SEC criterions
Method, belongs to technical field of petroleum extraction.
Background technology
The card volume transaction of SEC (The United States Securities and Exchange Commission) U.S.
The english abbreviation of the committee, is to list the management organization of oil company in the U.S., and it has formulated the criterion of oil and gas reserves assessment
(SEC criterions).In the U.S., the oil company of listing must carry out Reserves Assessment according to SEC criterions.
According to SEC criterions, the assessment of heavy oil heat production reservoir reserve is developed and has used dynamic method, mainly analyzed including decline curve
Method, reservoir numerical simulation method.
Decline curve analytic approach is common method, its production law and exploitation side using oil field actual production historical summary
Formula, Rational choice lapse rate assesses proved reserves according to economic limit.Want accurate application this technology oil production necessary with the time
With obvious decline trend, but for the oil reservoir in the steam soak later stage, due to using between combined type group steam injection, well or
The measure such as interlayer is taken over, development scheme is changed forms many segment hoppings of yield and successively decreases or phenomenon that is relatively steady, rising, lapse rate
Referring generally to the lapse rate of stabilization productive life before assessment block, and this section of lapse rate in period can not well reflect and gulp down value
The exploitation rule that development late stage assesses block is told, decline curve analytic approach is there is larger limitation in Reserves Assessment.
Reservoir numerical simulation method is predicted by oil field history matching, using existing operating technology, by oil reservoir number
There is certain uncertainty to the Production development that target block is simulated in value simulation, the assessment time is long.
Accordingly, it would be desirable to set up that a kind of accuracy is high, steam soak later stage reservoir reserve assessment side under rational SEC criterions
Method.
The content of the invention
In order to solve the above-mentioned technical problem, it is an object of the present invention to provide steam soak later stage under a kind of SEC criterions
Reserves Assessment method, the appraisal procedure carries out reasonable prediction by development late stage oil reservoir lapse rate of handling up, so that accurately, rationally
Reserves are estimated with decline curve analytic approach.
In order to realize above-mentioned technical purpose, the invention provides a kind of Reserves Assessment in steam soak later stage under SEC criterions
Method, the Reserves Assessment method in steam soak later stage is comprised the following steps under the SEC criterions：
Step one：According to the historical production data of target block, stage rate and time chart are drawn；
Step 2：Cumulative oil production and accumulation steam oil ratio (SOR) according to target block, obtain accumulation steam oil ratio (SOR) and accumulation oil-producing
The equation of linear regression of amount；
Step 3：The economic parameters of target block is collected, the economic limit steam oil ratio (SOR) and economic limit of target block is obtained
Yield；=economic parameters include the oil price of oil per ton, the thermal recovery expense of 1 ton of steam of note, the non-thermal recovery expense of ton oil, target block it is total
Oil recovery fixed cost, oily variable cost per ton, the oily expenses of taxation per ton and commodity rate；
Step 4：By accumulation steam oil ratio (SOR) and cumulative oil production equation of linear regression, economic limit steam oil ratio (SOR) and economic pole
Limited production amount, obtains the lapse rate of target block；
Step 5：According to target block lapse rate, the reserves of target block are assessed using Exponential Decline Method, completed to target
The assessment of steam soak later stage reserves under the SEC criterions of block.
The present invention provide SEC criterions under the steam soak later stage Reserves Assessment method in, in step one, according to mesh
The historical production data in block any stage is marked, stage rate and time chart is drawn, by drawing stage rate and time
Graph of a relation yield, to find the Changing Pattern of section, Changing Pattern includes upper product, stable yields and successively decreases that it is steadily to pass that analysis is successively decreased
Subtract or many segment hoppings are successively decreased.
The present invention provide SEC criterions under the steam soak later stage Reserves Assessment method in, it is preferable that in step 2,
The cumulative oil production of target block is obtained as follows with accumulation steam oil ratio (SOR)：
The cumulative oil production is obtained according to the historical production data of target block；
Accumulation steam oil ratio (SOR) is the accumulation steam injection amount and cumulative oil production obtained according to the historical production data of target block
Ratio.
The present invention provide SEC criterions under the steam soak later stage Reserves Assessment method in, accumulation steam injection amount is to pass through
What the historical production data of target block was obtained.
The present invention provide SEC criterions under the steam soak later stage Reserves Assessment method in, it is preferable that in step 2,
Cumulative oil production and accumulation steam oil ratio (SOR) according to target block, draw the graph of a relation of cumulative oil production and accumulation steam oil ratio (SOR), choose
Data are carried out regression analysis by the straight line segment data in cumulative oil production and accumulation steam oil ratio (SOR) graph of a relation, obtain accumulation steam oil ratio (SOR)
With cumulative oil production equation of linear regression.
Specific embodiment of the invention, commodity rate refers to the ratio that crude oil commodity amount accounts for crude oil total output.
The present invention provide SEC criterions under the steam soak later stage Reserves Assessment method in, it is preferable that accumulation steam oil ratio (SOR)
Equation of linear regression with cumulative oil production is：
SOR=A+BNp,
Wherein, SOR is accumulation steam oil ratio (SOR)；
NpIt is cumulative oil production, unit is ten thousand tons；
A, B are respectively regression coefficient, zero dimension.
The present invention provide SEC criterions under the steam soak later stage Reserves Assessment method in, it is preferable that economic limit vapour
Oil compares SORLFormula be：
Wherein, SORLIt is economic limit steam oil ratio (SOR)；
CcBe the thermal recovery expense of 1 ton of steam of note, unit for yuan/ton；
R is commodity rate, and unit is %；
PoBe oil price, unit for yuan/ton；
TaxoBe the oily expenses of taxation per ton, unit for yuan/ton；
CtBe the ton non-thermal recovery expense of oil, unit for yuan/ton.
The present invention provide SEC criterions under the steam soak later stage Reserves Assessment method in, it is preferable that economic limit produce
Amount QLFormula be：
Wherein, CfoIt is total oil recovery fixed cost of target block, unit is ten thousand yuan；
CvoBe oily variable cost per ton, unit for yuan/ton；
R is commodity rate, and unit is %；
PoBe oil price, unit for yuan/ton；
TaxoBe the oily expenses of taxation per ton, unit for yuan/ton.
The present invention provide SEC criterions under the steam soak later stage Reserves Assessment method in, it is preferable that in step 4
In, the lapse rate of target block is obtained by equation below：
NR1=NR2
Wherein,
NR1It is the economically recoverable of the target block that accumulation steam oil ratio (SOR) method is obtained, unit is ten thousand tons；
NR2It is the economically recoverable of the target block that diminishing method is obtained, unit is ten thousand tons；
SORLIt is economic limit steam oil ratio (SOR)；
A, B are respectively regression coefficient, zero dimension；
QiIt is the initil output of target block, unit is ten thousand tons；
QLIt is limiting economic rate, unit is ten thousand tons.
In steam soak later stage Reserves Assessment method under the SEC criterions that the present invention is provided, it is preferable that regression coefficient A, B
It is to be obtained by the equation of linear regression of accumulation steam oil ratio (SOR) and cumulative oil production.
In steam soak later stage Reserves Assessment method under the SEC criterions that the present invention is provided, the initil output of target block
It is to be obtained according to the historical production data of target block.
In steam soak later stage Reserves Assessment method under the SEC criterions that the present invention is provided, in step 5, according to target
Block lapse rate, the reserves of target block are assessed using Exponential Decline Method, are to be estimated meter with proved reserves assessment software
Calculate.
The present invention provide SEC criterions under the steam soak later stage Reserves Assessment method in, finally can to assessment tie
Fruit carries out analysis on its rationality.
Assessment result is the proved reserves of assessment block, and analysis on its rationality is carried out by corresponding development index, judges
Whether the actual development level of assessment block can be reflected, development index includes：Residual recoverable reserves, rate of oil production and storage are adopted
Than.
The Reserves Assessment method in steam soak later stage under SEC criterions of the invention, can calculating heavy oil heat production oil reservoir economy
The method for adopting reserves is incorporated into proved reserves assessment.When proved reserves assessment is carried out, first calculated with accumulation steam oil ratio (SOR) method and commented
Estimate the economically recoverable of unit, and substitute into Exponential Decline Method economically recoverable computing formula, you can try to achieve heavy oil heat production
The lapse rate of oil reservoir assessment unit, and then proved reserves are assessed using Exponential Decline Method.
Reserves Assessment method has theoretical foundation the steam soak later stage under SEC criterions of the invention, solves simple utilization
During diminishing method assessment reserves, the value of lapse rate does not account for combination with reference to the lapse rate of stabilization productive life before assessment block
Between formula group steam injection, well or interlayer take over, development scheme conversion etc. measure to develop rule influence, cause lapse rate value inclined
Greatly, the relatively low problem of assessment result, the need for development late stage Reserves Assessment of handling up is disclosure satisfy that substantially, improves Reserves Assessment knot
The accuracy and reasonability of fruit, are that Development Response of Oilfield evaluation and exploitation potential assessment provide reliable basis.
Brief description of the drawings
Fig. 1 is quarterly production and production time graph of a relation in embodiment 1.
Fig. 2 is accumulation steam oil ratio (SOR) and cumulative oil production graph of a relation in embodiment 1.
Fig. 3 is the Reserves Assessment figure obtained with diminishing method in embodiment 1.
Fig. 4 is the assessment figure that existing diminishing method assesses block.
Specific embodiment
In order to be more clearly understood to technical characteristic of the invention, purpose and beneficial effect, now to skill of the invention
Art scheme carry out it is described further below, but it is not intended that to it is of the invention can practical range restriction.
Embodiment 1
Present embodiments provide a kind of Reserves Assessment method of steam soak later stage block DuX block under SEC criterions, the assessment
Method is comprised the following steps：
Step one：The historical production data of target block is obtained, according to the historical production data of target block, the stage is drawn
Yield and time chart, as shown in Figure 1；
Step 2：Cumulative oil production and accumulation steam oil ratio (SOR) according to target block, draw cumulative oil production and accumulation gasoline
Than graph of a relation, as shown in Fig. 2 choosing the straight line segment data in cumulative oil production and accumulation steam oil ratio (SOR) graph of a relation, data are carried out
Regression analysis, obtains the equation of linear regression of accumulation steam oil ratio (SOR) and cumulative oil production；
Linear regression analysis is carried out using season creation data and obtains linearly returning between accumulation steam oil ratio (SOR) and cumulative oil production
Make a public possession formula：
SOR=A+BNp,
Wherein, SOR is accumulation steam oil ratio (SOR)；
NpIt is cumulative oil production, unit is ten thousand tons；
A, B are respectively regression coefficient, zero dimension.
Fastened with accumulation steam oil ratio (SOR) as ordinate in rectangular co-ordinate, cumulative oil production is abscissa, draw cumulative oil production
With accumulation steam oil ratio (SOR) graph of a relation 2, the straightway with linear relationship is chosen on Fig. 2, and (in September, 2007 in December, -2010 produces
Data), regression equation is obtained for SOR=1.968+0.0042Np, (N=14, R2=0.986) obtain regression coefficient A=1.0968,
B=0.0042.
Step 3：The economic parameters of target block is collected, the economic parameters includes oil price, 1 ton of steam of note of oil per ton
Thermal recovery expense, the non-thermal recovery expense of ton oil, fixed cost, oily variable cost per ton, the oily expenses of taxation per ton and commodity rate, obtain target area
The economic limit steam oil ratio (SOR) and limiting economic rate of block；
The oil price of oil per ton is 2957 yuan/ton, and the thermal recovery expense of 1 ton of steam of note is 243 yuan/ton, and the non-thermal recovery expense of ton oil is
595 yuan/ton, fixed cost is 12102.37 ten thousand yuan, and oily variable cost per ton is 640 yuan/ton, and the oily expenses of taxation per ton are 524.09
Yuan/ton, commodity rate is 88%.
Economic limit steam oil ratio (SOR) SORLFormula be：
Wherein, SORLIt is economic limit steam oil ratio (SOR)；
CcBe the thermal recovery expense of 1 ton of steam of note, unit for yuan/ton；
R is commodity rate, and unit is %；
PoBe oil price, unit for yuan/ton；
TaxoBe the oily expenses of taxation per ton, unit for yuan/ton；
CtBe the ton non-thermal recovery expense of oil, unit for yuan/ton.
Limiting economic rate QLFormula be：
Wherein, CfoIt is fixed cost, ten thousand yuan of unit；
CvoIt is oily variable cost per ton, yuan/ton；
R is commodity rate, and unit is %；
PoBe oil price, unit for yuan/ton；
TaxoBe the oily expenses of taxation per ton, unit for yuan/ton；
Economic limit steam oil ratio (SOR) is calculated for 6.66 tons/ton and economic limit oil production are 0.64 ten thousand tons.
Step 4：By accumulation steam oil ratio (SOR) and cumulative oil production equation of linear regression, economic limit steam oil ratio (SOR) and economic pole
Limited production amount, obtains the lapse rate of target block；
According to formula：NR1=NR2
Wherein,
NR1It is the economically recoverable of the target block that accumulation steam oil ratio (SOR) method is obtained, unit is ten thousand tons；
NR2It is the economically recoverable of the target block that diminishing method is obtained, unit is ten thousand tons；
Regression coefficient A, B that second step is obtained and the economic limit gas oil ratio and limiting economic rate that are obtained by the 3rd step
Substitute into equation below：
Wherein, SORLIt is economic limit steam oil ratio (SOR)；
A, B are respectively regression coefficient, zero dimension；
QiIt is the initil output of target block, unit is ten thousand tons；
QLIt is limiting economic rate, unit is ten thousand tons.
The lapse rate D of DuX can be calculatediIt is 11.6%.
Step 5：According to target block lapse rate, the reserves of target block are assessed using Exponential Decline Method.
The proved reserves for using Exponential Decline Method to assess DuX blocks are 190.45 ten thousand tons, as shown in Figure 3.Wherein, starting is assessed
Time is on January 1st, 2011, and the assessment termination time is on October 25th, 2029, and assessment initil output is 21701.74 tons/month,
Tail production is 2133.00 tons/month, and cumulative production is 484.86 ten thousand tons before.
Target block DuX blocks employ 20,610,000 tons of petroleum-in-place, year 25.52 ten thousand tons of oil-producing, accumulation oil-producing 484.86
Ten thousand tons, residual recoverable reserves rate of oil production 13.3%, reserve-production ratio 7.5 is matched with current Developing status.
But, existing diminishing method is the lapse rate with reference to the stabilization productive life before assessment block, then with diminishing method
Its proved reserves is assessed, specially：
Assessed with diminishing method, fit time section is in March, 2002 in September, -2005, fitting lapse rate is 23%, assessment
Proved reserves are 89.84 ten thousand tons, as shown in Figure 4.Wherein, assessment initial time be on January 1st, 2011, assessment the termination time be
On October 25th, 2029, assessment initil output is 21701.74 tons/month, and tail production is 2133.00 tons/month, and accumulation before is produced
Measure is 484.86 ten thousand tons.
The value of lapse rate does not account for combined type collection bolus with reference to the lapse rate of stabilization productive life before assessment block
Between vapour, well or interlayer take over, development scheme conversion etc. measure to develop rule influence, cause lapse rate value bigger than normal, assess
Lower result.
Above example illustrates that the result of the Reserves Assessment method in steam soak later stage is accurate under SEC criterions of the invention,
More suit oil field development rule.
Claims (8)
1. under a kind of SEC criterions the steam soak later stage Reserves Assessment method, it is characterised in that steam soak under the SEC criterions
The Reserves Assessment method in later stage is comprised the following steps：
Step one：According to the historical production data of target block, stage rate and time chart are drawn；
Step 2：Cumulative oil production and accumulation steam oil ratio (SOR) according to target block, obtain accumulation steam oil ratio (SOR) with cumulative oil production
Equation of linear regression；
Step 3：The economic parameters of target block is collected, the economic limit steam oil ratio (SOR) and limiting economic rate of target block is obtained；
The economic parameters includes that the oil price of oil per ton, the thermal recovery expense of 1 ton of steam of note, the non-thermal recovery expense of ton oil, target block are always adopted
Oily fixed cost, oily variable cost per ton, the oily expenses of taxation per ton and commodity rate；
Step 4：Produced by accumulation steam oil ratio (SOR) and cumulative oil production equation of linear regression, economic limit steam oil ratio (SOR) and economic limit
Amount, obtains the lapse rate of target block；
Step 5：According to the lapse rate of target block, the reserves of target block are assessed using Exponential Decline Method, completed to target area
The assessment of steam soak later stage reserves under the SEC criterions of block.
2. under SEC criterions according to claim 1 the steam soak later stage Reserves Assessment method, it is characterised in that step
In two, cumulative oil production and the accumulation steam oil ratio (SOR) of target block are obtained as follows：
The cumulative oil production is obtained according to the historical production data of target block；
Accumulation steam oil ratio (SOR) is the ratio of the accumulation steam injection amount and cumulative oil production obtained according to the historical production data of target block.
3. under SEC criterions according to claim 1 the steam soak later stage Reserves Assessment method, it is characterised in that step
In two, cumulative oil production and accumulation steam oil ratio (SOR) according to target block draw the graph of a relation of cumulative oil production and accumulation steam oil ratio (SOR),
The straight line segment data in cumulative oil production and accumulation steam oil ratio (SOR) graph of a relation is chosen, data are carried out with regression analysis, obtain accumulation vapour
Oil ratio and cumulative oil production equation of linear regression.
4. under the SEC criterions according to claim 1 or 3 the steam soak later stage Reserves Assessment method, it is characterised in that institute
State accumulation steam oil ratio (SOR) is with the equation of linear regression of cumulative oil production：
SOR=A+BNp,
Wherein, SOR is accumulation steam oil ratio (SOR)；
NpIt is cumulative oil production, unit is ten thousand tons；
A, B are respectively regression coefficient, zero dimension.
5. under SEC criterions according to claim 1 the steam soak later stage Reserves Assessment method, it is characterised in that it is described
Economic limit steam oil ratio (SOR) SORLFormula be：
Wherein, SORLIt is economic limit steam oil ratio (SOR)；
CcBe the thermal recovery expense of 1 ton of steam of note, unit for yuan/ton；
R is commodity rate, and unit is %；
PoBe oil price, unit for yuan/ton；
TaxoBe the oily expenses of taxation per ton, unit for yuan/ton；
CtBe the ton non-thermal recovery expense of oil, unit for yuan/ton.
6. under SEC criterions according to claim 1 the steam soak later stage Reserves Assessment method, it is characterised in that it is described
Limiting economic rate QLFormula be：
Wherein, CfoIt is total oil recovery fixed cost of target block, ten thousand yuan of unit；
CvoIt is oily variable cost per ton, yuan/ton；
R is commodity rate, and unit is %；
PoBe oil price, unit for yuan/ton；
TaxoBe the oily expenses of taxation per ton, unit for yuan/ton.
7. under SEC criterions according to claim 1 the steam soak later stage Reserves Assessment method, it is characterised in that in step
In rapid four, the lapse rate of target block is obtained by equation below：
NR1=NR2
Wherein,
NR1It is the economically recoverable of the target block that accumulation steam oil ratio (SOR) method is obtained, unit is ten thousand tons；
NR2It is the economically recoverable of the target block that diminishing method is obtained, unit is ten thousand tons；
SORLIt is economic limit steam oil ratio (SOR)；
A, B are respectively regression coefficient, zero dimension；
QiIt is the initil output of target block, unit is ten thousand tons；
QLIt is limiting economic rate, unit is ten thousand tons.
8. under SEC criterions according to claim 7 the steam soak later stage Reserves Assessment method, it is characterised in that return
Coefficient A, B are obtained by the equation of linear regression of accumulation steam oil ratio (SOR) and cumulative oil production.
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| CN110067555A (en) * | 2018-01-24 | 2019-07-30 | 中国石油天然气股份有限公司 | Method and device for determining minimum dynamic reserve of carbonate oil well |
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| CN108596429A (en) * | 2018-03-14 | 2018-09-28 | 中国石油天然气股份有限公司 | Calculation method and device for verifying annual correction values of developed reserves |
| CN108829999A (en) * | 2018-06-26 | 2018-11-16 | 重庆科技学院 | A kind of strong heterogeneity compact reservoir horizontal well fracturing cloth seam optimization method |
| CN108829999B (en) * | 2018-06-26 | 2022-03-01 | 重庆科技学院 | Staged fracturing seam-laying optimization method for strong-heterogeneity compact reservoir horizontal well |
| CN112396260A (en) * | 2019-08-13 | 2021-02-23 | 中国石油化工股份有限公司 | Gas reservoir decreasing rate determination method used in reserve value evaluation |
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