CN103605874A - Non-dimensional coefficient fracturing optimization design method - Google Patents
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- 238000013461 design Methods 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005457 optimization Methods 0.000 title abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 22
- XQCFHQBGMWUEMY-ZPUQHVIOSA-N Nitrovin Chemical compound C=1C=C([N+]([O-])=O)OC=1\C=C\C(=NNC(=N)N)\C=C\C1=CC=C([N+]([O-])=O)O1 XQCFHQBGMWUEMY-ZPUQHVIOSA-N 0.000 claims description 13
- 239000004576 sand Substances 0.000 claims description 10
- 230000009977 dual effect Effects 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 8
- 238000007667 floating Methods 0.000 claims description 5
- 238000012937 correction Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000005325 percolation Methods 0.000 claims description 4
- 230000035699 permeability Effects 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 230000013011 mating Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 238000010276 construction Methods 0.000 abstract description 11
- 238000005553 drilling Methods 0.000 abstract description 2
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- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 244000264242 Descurainia sophia Species 0.000 description 1
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
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Abstract
The invention discloses a dimensionless coefficient fracturing optimization design method. Determining a dimensionless oil and gas extraction index required by design according to the dimensionless parameter design and the fracturing model; and determining the actual possibly obtained dimensionless oil and gas production index according to the original construction parameters, reservoir parameters, drilling and logging information of the adjacent wells in the fracturing area. And if the designed target oil and gas production index is matched with the actually obtained oil and gas production index, determining the required fracture parameters and construction design parameters according to the designed target oil and gas production index and the required proppant coefficient Nprop. And if not, carrying out the optimized selection of the dimensionless characteristic parameters again until the dimensionless characteristic parameters are matched with the actually obtained dimensionless oil and gas production index. The invention directly takes the productivity as the fracturing design parameter required by the reverse thrust of the design target and takes the real statistical data of a large number of construction wells as data support, thereby greatly improving the pertinence and the reliability of the design parameter and furthest excavating the oil and gas productivity of the reservoir.
Description
Technical field
The present invention relates to a kind of dimensionless factor Optimized fracturing design method, be mainly used in fracturing reform and improve oil gas field per-well production.
Background technology
Fracturing reform is the important means that oil gas field improves per-well production.Traditional fracturing design method is conventionally to predict improved flaw size and output under fracturing reform scale and reservoir conditions.For example, the < < urban construction theoretical research > > of the 4th phase in 2012 discloses " Volcanic Rock reservoir fracturing structural control method ", set forth certain Volcanic Rock reservoir natural fracture open theory and small-sized mini-frac feature, and proposed to adapt to the fracturing reform technology method of Volcanic Rock reservoir.The field control of Volcanic Rock reservoir should in conjunction with reservoir terrestrial stress feature etc., be carried out fracture morphology analysis according to gel slug and flour sand treatment effect, and main frac sand ratio is rationally adjusted, and according to pressure changing, rationally controls discharge capacity and sand ratio.
But in existing fracturing design method, the offset well parameter of conventionally take reservoir conditions and transform region in the foothold of design parameter is as main, and design well yield can only could obtain after fracturing reform.Therefore in design process, the parameter optimization of how carrying out matching in conjunction with improved output and scope of construction item never obtains the solution of essence.
Summary of the invention
The object of the invention is to overcome the problems referred to above that existing fracturing design method exists, a kind of dimensionless factor Optimized fracturing design method is provided, the present invention is directly usingd production capacity and is pushed away required FRACTURING DESIGN parameter as design object is counter, and using and construct in a large number the true statistical data of well as data supporting, can increase substantially specific aim and the reliability of design parameter, excavate to greatest extent reservoir hydrocarbons production capacity.
For achieving the above object, the technical solution used in the present invention is as follows:
A dimensionless factor Optimized fracturing design method, is characterized in that, comprises the steps:
The three-dimensional dual medium two phase fluid flow physical model of a, HYDROCARBON-BEARING REGION, model target well place, contrasts and revises the parameter in model respectively in conjunction with offset well fracturing parameter and the reservoir parameter of pressure break, and model is tallied with the actual situation;
B, by offset well fracturing parameter, the reservoir parameter of fractured well and the output having obtained, carry out statistical regression, take every mouthful of well as sample point, make the correlativity plate of all offset well fracturing parameters, reservoir parameter and output, finally determine the target christmas index J that this wellblock offset well has obtained
d1;
C, setting dimensionless factor: the target christmas index J that sets a design
d2, under the target christmas index conditions by design, calculate the parameter that need to reach;
D, by target christmas index J
d2christmas index J with the actual acquisition of offset well
d1contrast, according to the dimensionless factor of setting, finally determine job design parameter.
In described step a, three-dimensional dual medium two phase fluid flow physical model comprises stratum filtration model and man-made fracture percolation model.
In described step a, the mode of described correction is by model, to calculate the result that obtains to contrast with the actual result of fractured well, if larger with real data difference, the part coefficient changing in model recalculates, until model tallies with the actual situation.
In described step b, the parameter of statistics comprises reservoir permeability, reservoir pressure, factor of porosity, reservoir thickness, pressure break discharge capacity, sand amount, liquid measure, termination of pumping pressure and output etc.
In described step c, the parameter that need to reach comprises fracture flow capacity C
fdD, crack is to the penetrance Ix of payzone and propping agent coefficient N
prop.
In described steps d, target christmas index J
d2christmas index J with the actual acquisition of offset well
d1contrast, if can mate actual conditions after contrast, according to propping agent coefficient N
prop, fracture flow capacity C
fdDwith crack, the penetrance Ix of payzone is finally determined to job design parameter.
In described steps d, target christmas index J
d2christmas index J with the actual acquisition of offset well
d1contrast, if can not mate actual conditions after contrast, float or the target christmas index of design of floating downward, until meet J
d2reach the relatively high level in this wellblock and required fracture flow capacity C
fdD, crack is to the penetrance Ix of payzone and propping agent coefficient N
proptill can realizing.
The described actual conditions of can not mating comprise: the target christmas index J of design
d2do not reach the christmas index level of offset well, or the target christmas index of design is too high, causes required fracture flow capacity C
fdD, crack is to the penetrance Ix of payzone and propping agent coefficient N
propexcessive and actual conditions cannot meet.
Employing the invention has the advantages that:
One, the Optimization Design the present invention relates to is with clearly defined objective, possesses the support of a large amount of true statisticss, the production capacity of directly usining pushes away required FRACTURING DESIGN parameter as design object is counter, and using and construct in a large number the true statistical data of well as data supporting, utilize this method for designing can increase substantially specific aim and the reliability of design parameter, excavate to greatest extent reservoir hydrocarbons production capacity.
Two, the present invention includes a series of dimensionless design parameter, optimization proportioning by these dimensionless groups is finally determined job design parameter, comprising propping agent coefficient, crack penetrance, dimensionless christmas index, dimensionless fracture flow capacity etc., it is starting point that this method for designing be take dimensionless that pressure break obtains (gas) index that recovers the oil, under the condition of a given reasonable production, anti-required flaw size, the crack of pushing away is to the penetrance of reservoir and flow conductivity etc., and final acquisition forms required infusion parameter and the scope of construction item in target crack.
Three, the present invention obtains by the reservoir parameter of fractured well of fractured well same layer position, same block and the statistical regression of construction parameter, has authenticity and operability.
Four, the present invention and traditional design method contrast have following some advantage: 1, purpose of design is clearer and more definite, directly usings production capacity as design object; 2, design parameter preferably has authenticity more, possesses the true statistical data of a large amount of construction wells.
Embodiment
Embodiment 1
A dimensionless factor Optimized fracturing design method, comprises the steps:
The three-dimensional dual medium two phase fluid flow physical model of a, HYDROCARBON-BEARING REGION, model target well place, contrasts and revises the parameter in model respectively in conjunction with offset well fracturing parameter and the reservoir parameter of pressure break, and model is tallied with the actual situation;
B, by offset well fracturing parameter, the reservoir parameter of fractured well and the output having obtained, carry out statistical regression, take every mouthful of well as sample point, make the correlativity plate of all offset well fracturing parameters, reservoir parameter and output, finally determine the target christmas index J that this wellblock offset well has obtained
d1;
C, setting dimensionless factor: the target christmas index J that sets a design
d2, under the target christmas index conditions by design, calculate the parameter that need to reach;
D, by target christmas index J
d2christmas index J with the actual acquisition of offset well
d1contrast, according to the dimensionless factor of setting, finally determine job design parameter.
In described step a, three-dimensional dual medium two phase fluid flow physical model comprises stratum filtration model and man-made fracture percolation model.
In described step a, the mode of described correction is by model, to calculate the result that obtains to contrast with the actual result of fractured well, if larger with real data difference, the part coefficient changing in model recalculates, until model tallies with the actual situation.
In described step b, the parameter of statistics comprises reservoir permeability, reservoir pressure, factor of porosity, reservoir thickness, pressure break discharge capacity, sand amount, liquid measure, termination of pumping pressure and output etc.
In described step c, the parameter that need to reach comprises fracture flow capacity C
fdD, crack is to the penetrance Ix of payzone and propping agent coefficient N
prop.
In described steps d, target christmas index J
d2christmas index J with the actual acquisition of offset well
d1contrast, if can mate actual conditions after contrast, according to propping agent coefficient N
prop, fracture flow capacity C
fdDwith crack, the penetrance Ix of payzone is finally determined to job design parameter.
In described steps d, target christmas index J
d2christmas index J with the actual acquisition of offset well
d1contrast, if can not mate actual conditions after contrast, float or the target christmas index of design of floating downward, until meet J
d2reach the relatively high level in this wellblock and required fracture flow capacity C
fdD, crack is to the penetrance Ix of payzone and propping agent coefficient N
proptill can realizing.
The described actual conditions of can not mating comprise: the target christmas index J of design
d2do not reach the christmas index level of offset well, or the target christmas index of design is too high, causes required fracture flow capacity C
fdD, crack is to the penetrance Ix of payzone and propping agent coefficient N
propexcessive and actual conditions cannot meet.
In the present invention, the foundation of three-dimensional dual medium two phase fluid flow physical model can adopt prior art, and manufacturing all of statistical regression and correlativity plate can adopt existing method.
Embodiment 2
The present invention is determined the dimensionless christmas index of design by dimensionless group design, pressure break model; By original construction parameter, reservoir parameter, brill well logging and the well-log information of fracture zone offset well, determine the dimensionless christmas index that actual capabilities obtain.If the christmas index-matched that the target christmas index of design and actual capabilities obtain, determines required fracture parameters and job design parameter with the required propping agent coefficient Nprop of the christmas exponential sum of design object.If do not mate, again carry out the optimization of dimensionless characteristic parameter and choose, until the dimensionless christmas index-matched obtaining with actual capabilities.Implementation method specifically comprises following flow process:
1, the three-dimensional dual medium two phase fluid flow physical model (comprising stratum filtration and man-made fracture percolation model) of HYDROCARBON-BEARING REGION, model target well place, in conjunction with the offset well fracturing parameter of pressure break and reservoir parameter, the parameter in model is contrasted and is revised that (mode of correction is by model, to calculate the result that obtains to contrast with the actual result of fractured well, if larger with real data difference, the part coefficient changing in model recalculates), model is tallied with the actual situation more.
2, by offset well fracturing parameter, the reservoir parameter of fractured well and the output having obtained, carry out statistical regression, the parameter of statistics comprises reservoir permeability, reservoir pressure, factor of porosity, reservoir thickness, pressure break discharge capacity, sand amount, liquid measure, termination of pumping pressure, output etc.Take every mouthful of well as sample point, make the correlativity plate of all offset well fracturing parameters, reservoir parameter and output, finally determine the target christmas index J that this wellblock offset well has obtained
d1.
3, set the target christmas index J of a design
d2, by obtaining under target christmas index conditions, calculate the fracture flow capacity C that need to reach
fdD, crack is to the penetrance Ix of payzone, propping agent coefficient N
propetc. parameter.
4, by the target christmas index J of design
d2target christmas index J with the actual acquisition of offset well
d1contrast and revise, if christmas index can reach dreamboat, according to propping agent coefficient N
propfinally determine the design parameters such as operational discharge capacity, scope of construction item with flaw size parameter.
If can not mate actual conditions (the target christmas index J of design after 5 contrasts
d2do not reach the christmas index level that offset well is higher, or the target christmas index of design is too high, cause the excessive and actual conditions such as required propping agent coefficient, flaw size to meet), according to above-mentioned two situations floating or the target christmas index of design of floating downward, until meet J
d2till reaching the parameters such as the relatively high level in this wellblock and required propping agent coefficient, dimensionless flow conductivity and can realizing.
Embodiment 3
The present invention will be described in conjunction with practical situations for the present embodiment, and mathematical statistics returns FRACTURING DESIGN example.
1, A well, is positioned at HC wellblock, and this well is a bite inclined shaft, and two sections of the palpuses of this well are shown in drilling process that 1 gas logging abnormal shows and are must two reservoir properties better; 4 sections of electric-log interpretation reservoirs, gross thickness 35.0m, factor of porosity 4.0～15.0%, water saturation 38.0～95.0%.1 section of its Mesosphere, 2 sections of poor gas-bearing formations, 1 section of gassiness water layer.Two sections of the palpuses of this well are carried out to staged fracturing.
Table 1:A borehole logging tool explanation results
The Xu Jia river fractured well of HC wellblock is according to the statistical result showed of more than 80 mouthfuls of wells, dimensionless gas productivity index is generally in 0.15 ~ 0.3 scope, according to mathematical statistics, return analog computation, by formation parameter and construction parameter idealized (maximizing after processing), can rise to 0.3 ~ 0.5 scope.
According to fracture flow capacity corresponding to A well proppants coefficient and A wellblock, reflection crack parameter under three kinds of propping agent coefficients is analyzed:
If 1 target dimensionless productivity index 0.45.Corresponding propping agent coefficient must > 0.06.
If 2 consider that propping agent coefficient is 0.1.Crack dimensionless flow conductivity C
fDbetween 0.4 ~ 3, be advisable;
If dimensionless productivity index target is 0.35.Corresponding propping agent coefficient more than 0.03 can satisfy condition;
Now this well has three kinds of fracturing parameters to select for optimizing:
1, NP=0.1: corresponding dimensionless fracture flow capacity C
fDscope can satisfy condition in 0.2 ~ 12 scope;
2, NP=0.06: corresponding dimensionless fracture flow capacity C
fDscope can satisfy condition in 0.35 ~ 6 scope;
3, NP=0.03: corresponding dimensionless fracture flow capacity C
fDscope can satisfy condition in 0.7 ~ 11 scope.
Comprehensive various factors consideration, this well target gas productivity index is decided to be 0.35.Recommend unit thickness to add sand scale: 2.4m
3/ m.Recommend three layers and add sand total scale: 50m
3.
Three layers, form 2:A well adds sand scale optimization result
Claims (8)
1. a dimensionless factor Optimized fracturing design method, is characterized in that, comprises the steps:
The three-dimensional dual medium two phase fluid flow physical model of a, HYDROCARBON-BEARING REGION, model target well place, contrasts and revises the parameter in model respectively in conjunction with offset well fracturing parameter and the reservoir parameter of pressure break, and model is tallied with the actual situation;
B, by offset well fracturing parameter, the reservoir parameter of fractured well and the output having obtained, carry out statistical regression, take every mouthful of well as sample point, make the correlativity plate of all offset well fracturing parameters, reservoir parameter and output, finally determine the target christmas index J that this wellblock offset well has obtained
d1;
C, setting dimensionless factor: the target christmas index J that sets a design
d2, under the target christmas index conditions by design, calculate the parameter that need to reach;
D, by target christmas index J
d2christmas index J with the actual acquisition of offset well
d1contrast, according to the dimensionless factor of setting, finally determine job design parameter.
2. dimensionless factor Optimized fracturing design method according to claim 1, is characterized in that: in described step a, three-dimensional dual medium two phase fluid flow physical model comprises stratum filtration model and man-made fracture percolation model.
3. dimensionless factor Optimized fracturing design method according to claim 1 and 2, it is characterized in that: in described step a, the mode of described correction is by model, to calculate the result that obtains to contrast with the actual result of fractured well, if larger with real data difference, the part coefficient changing in model recalculates, until model tallies with the actual situation.
4. dimensionless factor Optimized fracturing design method according to claim 3, it is characterized in that: in described step b, the parameter of statistics comprises reservoir permeability, reservoir pressure, factor of porosity, reservoir thickness, pressure break discharge capacity, sand amount, liquid measure, termination of pumping pressure and output.
5. according to the dimensionless factor Optimized fracturing design method described in claim 1,2 or 4, it is characterized in that: in described step c, the parameter that need to reach comprises fracture flow capacity C
fdD, crack is to the penetrance Ix of payzone and propping agent coefficient N
prop.
6. dimensionless factor Optimized fracturing design method according to claim 5, is characterized in that: in described steps d, and target christmas index J
d2christmas index J with the actual acquisition of offset well
d1contrast, if can mate actual conditions after contrast, according to propping agent coefficient N
prop, fracture flow capacity C
fdDwith crack, the penetrance Ix of payzone is finally determined to job design parameter.
7. dimensionless factor Optimized fracturing design method according to claim 6, is characterized in that: in described steps d, and target christmas index J
d2christmas index J with the actual acquisition of offset well
d1contrast, if can not mate actual conditions after contrast, float or the target christmas index of design of floating downward, until meet J
d2reach the relatively high level in this wellblock and required fracture flow capacity C
fdD, crack is to the penetrance Ix of payzone and propping agent coefficient N
proptill can realizing.
8. dimensionless factor Optimized fracturing design method according to claim 7, is characterized in that: the described actual conditions of can not mating comprise: the target christmas index J of design
d2do not reach the christmas index level of offset well, or the target christmas index of design is too high, causes required fracture flow capacity C
fdD, crack is to the penetrance Ix of payzone and propping agent coefficient N
propexcessive and actual conditions cannot meet.
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| CN104847339A (en) * | 2014-12-09 | 2015-08-19 | 中国石油集团川庆钻探工程有限公司 | Method for evaluating shale gas reservoir by using compaction index |
| CN105350960A (en) * | 2015-12-07 | 2016-02-24 | 西南石油大学 | Method of determining fractured horizontal well crack parameters of low-permeability anisotropic gas reservoir |
| CN105422071A (en) * | 2015-12-07 | 2016-03-23 | 西南石油大学 | Method for evaluating rationality of low-permeability non-homogeneous gas reservoir fracturing horizontal well fracture parameters |
| CN106321051A (en) * | 2015-07-01 | 2017-01-11 | 中国石油化工股份有限公司 | Method for optimizing multi-section fractured horizontal well network crack parameter |
| CN106761733A (en) * | 2017-01-06 | 2017-05-31 | 中国海洋石油总公司 | A kind of horizontal wells in heavy oil reservoir steam soak initial productivity Forecasting Methodology |
| CN109424348A (en) * | 2017-09-05 | 2019-03-05 | 中国石油化工股份有限公司 | The judgment method and system of the more cluster perforating and fracturing Number of Fractures of horizontal well |
| CN109815542A (en) * | 2018-12-21 | 2019-05-28 | 东软集团股份有限公司 | Recognition methods, device, storage medium and the electronic equipment of sand plugging after fracturing |
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| CN104314547A (en) * | 2014-08-18 | 2015-01-28 | 北京运嘉普泰石油天然气技术发展有限公司 | HAFD segmented optimization method and system |
| CN104847339A (en) * | 2014-12-09 | 2015-08-19 | 中国石油集团川庆钻探工程有限公司 | Method for evaluating shale gas reservoir by using compaction index |
| CN104847339B (en) * | 2014-12-09 | 2017-09-22 | 中国石油集团川庆钻探工程有限公司 | Method for evaluating shale gas reservoir by using compaction index |
| CN106321051A (en) * | 2015-07-01 | 2017-01-11 | 中国石油化工股份有限公司 | Method for optimizing multi-section fractured horizontal well network crack parameter |
| CN106321051B (en) * | 2015-07-01 | 2019-02-15 | 中国石油化工股份有限公司 | A method of for optimizing multistage pressure break horizontal well network fracture parameter |
| CN105350960A (en) * | 2015-12-07 | 2016-02-24 | 西南石油大学 | Method of determining fractured horizontal well crack parameters of low-permeability anisotropic gas reservoir |
| CN105422071A (en) * | 2015-12-07 | 2016-03-23 | 西南石油大学 | Method for evaluating rationality of low-permeability non-homogeneous gas reservoir fracturing horizontal well fracture parameters |
| CN105350960B (en) * | 2015-12-07 | 2018-11-23 | 西南石油大学 | The method for determining low-permeable heterogeneous gas reservoir fracture parameters of fractured horizontal wells |
| CN105422071B (en) * | 2015-12-07 | 2018-12-11 | 西南石油大学 | Evaluate the rational method of low-permeable heterogeneous gas reservoir fracture parameters of fractured horizontal wells |
| CN106761733A (en) * | 2017-01-06 | 2017-05-31 | 中国海洋石油总公司 | A kind of horizontal wells in heavy oil reservoir steam soak initial productivity Forecasting Methodology |
| CN109424348A (en) * | 2017-09-05 | 2019-03-05 | 中国石油化工股份有限公司 | The judgment method and system of the more cluster perforating and fracturing Number of Fractures of horizontal well |
| CN109815542A (en) * | 2018-12-21 | 2019-05-28 | 东软集团股份有限公司 | Recognition methods, device, storage medium and the electronic equipment of sand plugging after fracturing |
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