CN104653175A - Natural water-drive reservoir producing reserve calculating method - Google Patents
Natural water-drive reservoir producing reserve calculating method Download PDFInfo
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- CN104653175A CN104653175A CN201310597802.0A CN201310597802A CN104653175A CN 104653175 A CN104653175 A CN 104653175A CN 201310597802 A CN201310597802 A CN 201310597802A CN 104653175 A CN104653175 A CN 104653175A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
Abstract
The invention discloses a natural water-drive reservoir producing reserve calculating method. The natural water-drive reservoir producing reserve calculating method comprises, firstly, screening out successfully-developed units with similar oil reservoir natural energy evaluation as representative units, and calculating out the average producing reserve coefficient of the representative units; secondly, according to the A type curve of a unit to be evaluated, obtaining a coefficient b, combined with the average producing reserve coefficient, calculating the producing reserve of the unit to be evaluated, and comparing a calculating result to the geological reserve of the unit to be evaluated to evaluate whether the producing reserve of the unit to be evaluated is sufficient. The natural water-drive reservoir producing reserve calculating method is applied to high-water-content natural water drive developing units in the Shengli Oil Field which have already enter a later development state, and can rapidly and accurately calculate out the producing reserves of natural water-drive reservoirs, thereby verifying the operational reliability in dynamic reserve coefficient in the kind of oil reservoirs.
Description
Technical field
The present invention relates to reservoir engineering field, particularly relate to the computational methods of natural water drive reservoir oil well mining-employed reserves.
Background technology
About the calculating of oilfield water flooding mining-employed reserves, the computational methods of utilization primary-type water drive curve that propose as far back as the seventies in last century of Mr. Tong Xianzhang before this, extensive use in artificial recharge exploitation oil reservoir development is evaluated.
Primary-type water drive curve relational expression:
LgWp=bNp+a
In formula, Wp is oil field or unit cumulative water production, 10
4t; Np is oil field or unit cumulative oil production, 10
4t; A and b is coefficient, decimal.
Have identical factor of proportionality to be constant between all with the oil reservoir oil in place N of reciprocal value B of slope b own, this coefficient is defined as dynamic holdup coefficient.Relational expression is as follows: B=1/b.
Dynamic holdup coefficient calculations relational expression: N ÷ B=7.5.
Water drive mining-employed reserves Z ' calculation relational expression: Z '=7.5B.
Later correlative study shows, the key problem in technology using A type curve to calculate water-driven reserves is determination and the correction of dynamic holdup coefficient, the dependency relation of dynamic holdup factor v size and well pattern improvement degree difinite quality.Prior art, it is believed that the dynamic storage coefficient of artificial water drive initial stage well pattern is 7.5, and when the later stage, well pattern was comparatively improved, dynamic storage coefficient is 6.0.But, use artificial water-drive pool to move storage coefficient 6.0 to calculate the mining-employed reserves of natural water drive generally bigger than normal, again be greater than oil in place more than 30%, can precise calibration dynamic holdup coefficient in the urgent need to one, thus the computational methods of accurate estimation natural water drive reservoir oil well mining-employed reserves.
Summary of the invention
The object of this invention is to provide a kind of can be simple and quick and calculate the computational methods of the mining-employed reserves of natural water drive reservoir comparatively accurately.
The technical solution used in the present invention is: the computational methods of natural water drive reservoir mining-employed reserves, it is characterized in that: first screened successfully exploitation and oil reservoir natural energy evaluates similar similar units representatively unit, count the average dynamic storage coefficient of described representative unit; Secondly try to achieve coefficient b for the A type curve of evaluation unit, go out the mining-employed reserves of this evaluation unit in conjunction with above-mentioned average dynamic storage coefficient calculations, the oil in place of result of calculation and this unit contrasts, and whether fully evaluates evaluation unit reserves exploitation.
Further, the method specifically comprises the steps:
Step 1, has screened successfully exploitation from the existing natural water drive development block of oil field and oil reservoir natural energy evaluates similar similar units representatively unit;
Step 2, chooses a representative unit from above-mentioned representative unit, draws the unit exploitation curve of this representative unit, and described unit exploitation curve is primary-type water drive curve, and its expression formula is
LgWp=bNp+a （1），
In formula, Wp is oil field or unit cumulative water production, 10
4t; Np is oil field or unit cumulative oil production, 10
4t; A and b is coefficient;
Choose the suitable time period, adopt regression formula (1), try to achieve the b value of this unit,
According to formula B=1/b (2),
Try to achieve B,
According to formula dynamic storage coefficient=N/B (3),
Calculate the dynamic storage coefficient of this representative unit;
Wherein, N is the oil in place of this representative unit,
Step 3: repeat step 2, until calculate the dynamic storage coefficient of all representative units;
Step 4, carries out statistical analysis to the dynamic storage coefficient of representative units all in step 3, obtains the average dynamic storage coefficient of this natural water drive reservoir;
Step 5, chooses the unit of needs assessment, draws the unit exploitation curve of this unit, and described unit exploitation curve is primary-type water drive curve, and its expression formula is
LgWp=bNp+a （1），
In formula, Wp is oil field or unit cumulative water production, 10
4t; Np is oil field or unit cumulative oil production, 10
4t; A and b is coefficient;
Choose the suitable time period, regression formula (1), try to achieve the b value of this unit,
According to formula B=1/b (2),
Try to achieve B,
Adopt formula Z '=average dynamic storage coefficient × B (4),
Calculate the mining-employed reserves Z ' of this unit, wherein said average dynamic storage coefficient is obtain average dynamic storage coefficient in step step 4;
Contrast the mining-employed reserves Z ' of this unit and this unit oil in place, whether fully evaluate this unit reserves exploitation.
Further, in step 1, described from the existing natural water drive development block of oil field, screened successfully exploitation and oil reservoir natural energy evaluate similar similar units representatively unit refer to: choose from the existing natural water drive development block of oil field that success is developed and oil reservoir natural energy evaluation index close to needs assessment unit and the development time is long, well pattern controls fully, the reliable similar units of oil in place representatively unit;
Described oil reservoir natural energy evaluation index comprises one of extraction percentage oil in place strata pressure drop-out value, elasticity output ratio.Described oil reservoir natural energy evaluation index refers to close to needs assessment unit: when one of similar units and evaluation unit extraction percentage oil in place strata pressure drop-out value is all between 0.01MPa to 0.1MPa, both requirements difference is less than 0.03MPa, when one of similar units and evaluation unit extraction percentage oil in place strata pressure drop-out value is all between 0.1MPa to 1MPa, both requirements difference is at 0.3MPa.
Described development time length refers to that the development time is no less than 15 years; Described well pattern controls fully to refer to that the well pattern mining-employed reserves calculated meets or exceeds oil in place.Oil in place reliably refers to that development plan is through examining and being audited by expert group.Oil in place is found out by geological prospecting.Development plan can be passed through the exploitation checking of a period of time, proves rationally reliably.
Further, in steps of 5, evaluate this unit reserves exploitation whether fully time, also comprising by the current well spacing density of this unit is the step of reference, evaluation conclusion reliability.
Further, when evaluation conclusion reliability, also comprise with this unit development time length short, develop the step that abundant degree is reference, evaluation conclusion reliability.
Further, in step 2, step 5, when adopting formula (1) to ask for b value, the moisture of A type curve appearance need be avoided and upwarp the stage, containing the hydraulic head stage.
Further, in step 2, referring to of described suitable time period: oil well drives a well to count and stablizes, and Liquid output is stablized, moisture according to the develop process model continually varying time period.
Further, in step 4, described statistical analysis refers to be analyzed according to the similitude of data, rejects obvious dissimilar dynamic storage coefficient.
Further, in steps of 5, evaluate this unit reserves exploitation whether fully time, reference index is reserves exploitation degree, i.e. the mining-employed reserves of well pattern exploitation divided by oil in place, then is multiplied by percentage.Reserves exploitation degree reaches more than 95% for employing fully; Be comparatively abundant between 75% to 95%; Be less than 75% for insufficient.
The present invention starts with from the Analysis on Mechanism that oil well is fuel-displaced, and namely the energy of natural water body is equal to the energy being even better than artificial recharge and supplementing, and thus reservoir driving means is all water drive, should follow waterflooding development rule.By drawing the A type curve of natural water drive reservoir, find the A type curve being substantially similar to artificial water drive exploitation oil reservoir.Thus, the present invention by choosing representative unit, the technological means such as WATER DISPLACEMENT CURVES value regression calculation, data analysis statistical and screening, accurate correction has been carried out to dynamic storage coefficient of the prior art, and verified by evaluation unit, efficiently solve in prior art the problem adopting the mining-employed reserves precision of primary-type water drive curve evaluation natural water drive reservoir not high.The present invention has developed the High water cut natural water drive development block entering the later stage and has tested in SHENGLI PETROLEUM AREA, it concludes the dynamic holdup coefficient obtaining applicable natural water drive reservoir, in the Calculation Estimation of causeway oil field example element is analyzed, substantially identical with the reality of example element, demonstrating the present invention can be simple and quick and calculate the mining-employed reserves of natural water drive reservoir comparatively accurately, also illustrate that the dependability of the present invention at the dynamic holdup coefficient of such oil reservoir.
Accompanying drawing explanation
Fig. 1 is a specific embodiment flow chart of the computational methods method of natural water drive reservoir mining-employed reserves of the present invention.
Fig. 2 is SLB1 development block exploitation curve map.
Fig. 3 is SLB1 development block A type curve map.
Fig. 4 is SLPJB1 development block A type curve map.
Fig. 5 is SLPJB2 development block A type curve map.
Fig. 6 is SLPJB3 development block A type curve map.
Fig. 7 is SLPJB4 development block A type curve map.
Detailed description of the invention
For making above and other object of the present invention, feature and advantage can become apparent, cited below particularly go out preferred embodiment, and coordinate institute's accompanying drawings, be described in detail below.
Embodiment 1.As shown in Figure 1, Fig. 1 is a specific embodiment flow chart of the computational methods of the mining-employed reserves of natural water drive reservoir of the present invention.By successfully to develop and oil reservoir natural energy is evaluated similar units and obtained the dynamic storage coefficient of such oil reservoir in step 101 to step 107; In step 109 to step 117, be that the dynamic storage coefficient obtained is applied, the mining-employed reserves of Calculation Estimation unit above to evaluation unit, pass judgment on reserves exploitation adequacy, and prove the evaluation result degree of reliability by well spacing density index.
In step 101, evaluation unit situation as required.Choose the similar development block of the similar oil reservoir of SHENGLI PETROLEUM AREA natural water drive, stratum natural energy evaluates similar units 8.It is long that these similar units have the development time, and well pattern controls fully, the reliable feature of oil in place (see table 1).The statistics of dynamic holdup coefficient is carried out to these similar units and determines.
In step 103, such as SLB1 natural water drive development block, according to Fig. 2, draw the exploitation curve of SLB1 unit, screening time section year August in April, 2004 to 2009, during this, oil well drives a well several basicly stable, and Liquid output is basicly stable, moisture according to develop process model consecutive variations, the time period judges available.
In step 105, draw SLB1 unit A type curve as Fig. 3, according to the time period that Fig. 2 obtains, regression relation
Lg (W
p)=0.0128*N
p+ 1.695, correlation R
2=0.999.
B=0.128 is determined by relational expression;
B=1/b=78.125。
In step 107,
By SLB1 unit oil in place 312 × 10
4t, then dynamic storage coefficient N/B=312/78.125=3.9936.
Table 1 is triumph 8 natural water drive reservoirs dynamic storage coefficients statistics table.
Table 1 triumph 8 natural water drive reservoirs dynamic storage coefficients statistics table
Slope value in these 8 unit, has avoided the moisture of A type curve appearance and has upwarped the stage, containing the hydraulic head stage, ensures the objective reliability of dynamic storage coefficient.The average dynamic storage coefficient being drawn above 8 development blocks by statistics is 4.09, during use, and it is 4.0 that dynamic storage coefficient value rounds value.
In the mining-employed reserves that step 109 to step 117 is to evaluation unit utilization dynamic storage coefficient calculations evaluation unit, as Fig. 4,5,6,7, details are as follows for result of calculation:
Fig. 4 is for being SLPJB1 development block A type curve map.Obtain coefficient b value 0.0051 from A type curve, then B is 196.1, and calculating water drive mining-employed reserves is thus 784.3 ten thousand tons, and relative to this unit oil in place 7,830,000 tons, natural water drive reserves exploitation degree is 100%, and it is good that reserves control development degree.This index and the current well spacing density of this block 16.4 mouthfuls/km
2this index is coincide.
Fig. 5 is SLPJB2 development block A type curve map.Obtain coefficient b value 0.01 from A type curve, then B is 100, and calculating water drive mining-employed reserves is thus 4,000,000 tons, and relative to this unit oil in place 3,730,000 tons, natural water drive reserves exploitation degree is 107%, and it is good that reserves control development degree.This index and the current well spacing density of this block 9.8 mouthfuls/km
2this index is coincide.
Fig. 6 is SLPJB3 development block A type curve map.Obtain coefficient b value 0.0362 from A type curve, then B is 27.6, and calculating water drive mining-employed reserves is thus 110.5 ten thousand tons, and relative to this unit oil in place 2,640,000 tons, natural water drive reserves exploitation degree is 41.9%, and it is low that reserves control development degree.This index and the current well spacing density of this block 7.0 mouthfuls/km
2this index misfits, and reason is that this unit development time is short, develops insufficient.
Fig. 7 is SLPJB4 development block A type curve map.Obtain coefficient b value 0.0385 from A type curve, then B is 26, and calculating water drive mining-employed reserves is thus 1,040,000 tons, and relative to this unit oil in place 1,480,000 tons, natural water drive reserves exploitation degree is 70.2%, and it is low that reserves control development degree.This index and the current well spacing density of this block 4.0 mouthfuls/km
2this index is coincide.
This example has developed 8 the High water cut natural water drive development blocks entering the later stage in conjunction with SHENGLI PETROLEUM AREA, conclude the dynamic holdup coefficient obtaining applicable natural water drive reservoir, by the Calculation Estimation analysis to certain 4 example element in oil field, demonstrate the dependability of the dynamic holdup coefficient of such oil reservoir.
Claims (9)
1. the computational methods of natural water drive reservoir mining-employed reserves, is characterized in that: first screened successfully exploitation and oil reservoir natural energy evaluates similar similar units representatively unit, count the average dynamic storage coefficient of described representative unit; Secondly try to achieve coefficient b for the A type curve of evaluation unit, go out the mining-employed reserves of this evaluation unit in conjunction with above-mentioned average dynamic storage coefficient calculations, the oil in place of result of calculation and this unit contrasts, and whether fully evaluates evaluation unit reserves exploitation.
2. the computational methods of natural water drive reservoir mining-employed reserves as claimed in claim 1, is characterized in that: the method specifically comprises the steps:
Step 1, has screened successfully exploitation from the existing natural water drive development block of oil field and oil reservoir natural energy evaluates similar similar units representatively unit;
Step 2, chooses a representative unit from above-mentioned representative unit, draws the unit exploitation curve of this representative unit, and described unit exploitation curve is primary-type water drive curve, and its expression formula is
LgWp=bNp+a （1），
In formula, Wp is oil field or unit cumulative water production, 10
4t; Np is oil field or unit cumulative oil production, 10
4t; A and b is coefficient;
Choose the suitable time period, adopt regression formula (1), try to achieve the b value of this unit,
According to formula B=1/b (2),
Try to achieve B,
According to formula dynamic storage coefficient=N/B (3),
Calculate the dynamic storage coefficient of this representative unit;
Wherein, N is the oil in place of this representative unit,
Step 3: repeat step 2, until calculate the dynamic storage coefficient of all representative units;
Step 4, carries out statistical analysis to the dynamic storage coefficient of representative units all in step 3, obtains the average dynamic storage coefficient of this natural water drive reservoir;
Step 5, chooses the unit of needs assessment, draws the unit exploitation curve of this unit, and described unit exploitation curve is primary-type water drive curve, and its expression formula is
LgWp=bNp+a （1），
In formula, Wp is oil field or unit cumulative water production, 10
4t; Np is oil field or unit cumulative oil production, 10
4t; A and b is coefficient;
Choose the suitable time period, regression formula (1), try to achieve the b value of this unit,
According to formula B=1/b (2),
Try to achieve B,
Adopt formula Z '=average dynamic storage coefficient × B (4),
Calculate the mining-employed reserves Z ' of this unit, wherein said average dynamic storage coefficient is obtain average dynamic storage coefficient in step step 4;
Contrast the mining-employed reserves Z ' of this unit and this unit oil in place, whether fully evaluate this unit reserves exploitation.
3. the computational methods of natural water drive reservoir mining-employed reserves as claimed in claim 2, it is characterized in that: in step 1, described from the existing natural water drive development block of oil field, screened successfully exploitation and oil reservoir natural energy evaluate similar similar units representatively unit refer to: choose from the existing natural water drive development block of oil field that success is developed and oil reservoir natural energy evaluation index close to needs assessment unit and the development time is long, well pattern controls fully, the reliable similar units of oil in place representatively unit;
Described oil reservoir natural energy evaluation index comprises one of extraction percentage oil in place strata pressure drop-out value, elasticity output ratio; Described oil reservoir natural energy evaluation index is close to referring to: when one of similar units and evaluation unit extraction percentage oil in place strata pressure drop-out value is all between 0.01MPa to 0.1MPa, both requirements difference is less than 0.03MPa, when one of similar units and evaluation unit extraction percentage oil in place strata pressure drop-out value is all between 0.1MPa to 1MPa, both requirements difference is less than 0.3MPa;
Described development time length refers to that the development time is no less than 15 years; Described well pattern controls fully to refer to that the well pattern mining-employed reserves calculated meets or exceeds oil in place; Described oil in place reliably refers to that development plan is through examining and being audited by expert group.
4. the computational methods of natural water drive reservoir mining-employed reserves as claimed in claim 3, is characterized in that: in steps of 5, evaluate this unit reserves exploitation whether fully time, also comprising by the current well spacing density of this unit is the step of reference, evaluation conclusion reliability.
5. the computational methods of natural water drive reservoir mining-employed reserves as claimed in claim 4, is characterized in that: when evaluation conclusion reliability, also comprise with this unit development time length short, develop the step that abundant degree is reference, evaluation conclusion reliability.
6. the computational methods of the natural water drive reservoir mining-employed reserves as described in a claim as any in claim 1 to 5, it is characterized in that: in step 2, step 5, when adopting formula (1) to ask for b value, the moisture of A type curve appearance need be avoided and upwarp the stage, containing the hydraulic head stage.
7. the computational methods of the natural water drive reservoir mining-employed reserves as described in a claim as any in claim 1 to 5, it is characterized in that: in step 2, referring to of described suitable time period: oil well drives a well to count and stablizes, and Liquid output is stablized, moisture according to the develop process model continually varying time period.
8. the computational methods of the natural water drive reservoir mining-employed reserves as described in a claim as any in claim 1 to 5, is characterized in that: in step 4, and described statistical analysis refers to be analyzed according to the similitude of data, rejects obvious dissimilar dynamic storage coefficient.
9. the computational methods of natural water drive reservoir mining-employed reserves as claimed in claim 3, it is characterized in that: in steps of 5, evaluate this unit reserves exploitation whether fully time, reference index is reserves exploitation degree, namely the mining-employed reserves of well pattern exploitation is divided by oil in place, then is multiplied by percentage; Reserves exploitation degree reaches more than 95% for employing fully; Be comparatively abundant between 75% to 95%; Be less than 75% for insufficient.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105956938A (en) * | 2016-05-18 | 2016-09-21 | 恒泰艾普（北京）能源科技研究院有限公司 | Fracture-vug type oil reservoir dynamic reserve calculation method |
| CN106481315A (en) * | 2015-08-31 | 2017-03-08 | 中国石油化工股份有限公司 | Land sandstone oil reservoir individual well recoverable reserves quickly determines model and method for building up |
| CN108180007A (en) * | 2017-12-26 | 2018-06-19 | 中国石油化工股份有限公司 | Old filed economic limit drilling well potentiality and recovery ratio measuring and calculating new method |
| CN109281660A (en) * | 2017-07-19 | 2019-01-29 | 中国石油化工股份有限公司 | A method of for determining fracture-pore reservoir well control reserves |
| CN109857985A (en) * | 2019-01-30 | 2019-06-07 | 中国石油大学(华东) | A kind of compact oil reservoir driving stage recognition methods |
| CN113609436A (en) * | 2021-08-20 | 2021-11-05 | 中海石油(中国)有限公司 | Calculation method for controlling reserve consumption of reserve unit |
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| CN106481315A (en) * | 2015-08-31 | 2017-03-08 | 中国石油化工股份有限公司 | Land sandstone oil reservoir individual well recoverable reserves quickly determines model and method for building up |
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| CN105956938A (en) * | 2016-05-18 | 2016-09-21 | 恒泰艾普（北京）能源科技研究院有限公司 | Fracture-vug type oil reservoir dynamic reserve calculation method |
| CN105956938B (en) * | 2016-05-18 | 2020-03-27 | 恒泰艾普（北京）能源科技研究院有限公司 | Method for calculating dynamic reserves of fracture-cavity oil reservoir |
| CN109281660A (en) * | 2017-07-19 | 2019-01-29 | 中国石油化工股份有限公司 | A method of for determining fracture-pore reservoir well control reserves |
| CN108180007A (en) * | 2017-12-26 | 2018-06-19 | 中国石油化工股份有限公司 | Old filed economic limit drilling well potentiality and recovery ratio measuring and calculating new method |
| CN108180007B (en) * | 2017-12-26 | 2021-11-16 | 中国石油化工股份有限公司 | New method for measuring and calculating economic ultimate drilling potential and recovery ratio of old oil field |
| CN109857985A (en) * | 2019-01-30 | 2019-06-07 | 中国石油大学(华东) | A kind of compact oil reservoir driving stage recognition methods |
| CN113609436A (en) * | 2021-08-20 | 2021-11-05 | 中海石油(中国)有限公司 | Calculation method for controlling reserve consumption of reserve unit |
| CN113609436B (en) * | 2021-08-20 | 2024-04-16 | 中海石油(中国)有限公司 | Calculation method for controlling reserve unit reserve |
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