CN104679986A - Detection method for heterogeneous degree of polymer flooding oil deposit - Google Patents
Detection method for heterogeneous degree of polymer flooding oil deposit Download PDFInfo
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- CN104679986A CN104679986A CN201510033996.0A CN201510033996A CN104679986A CN 104679986 A CN104679986 A CN 104679986A CN 201510033996 A CN201510033996 A CN 201510033996A CN 104679986 A CN104679986 A CN 104679986A
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Abstract
The invention provides a detection method for the heterogeneous degree of a polymer flooding oil deposit. According to the detection method, the heterogeneous degree of the polymer flooding oil deposit is judged mainly according to a linear relationship between polymer output moments and injection and production well distance square. The detection method specifically includes: monitoring polymer concentration output data of each producing well, determining polymer output moments of the producing wells, and drawing a scatter diagram of the polymer output moments of the producing wells and the injection and production well distance square; calculating and standardizing a residual error, and eliminating singular points in data points according to the standardized residual error; performing linear regression on the data subjected to singular point elimination, and acquiring a straight line of the polymer output moments and the injection and production well distance square through fitting; calculating the standardized residual error again, dividing the heterogeneous degree of the polymer flooding oil deposit according to a numerical value of the standardized residual error and judging existence possibility of a large pore path. The method is high in operability, convenient to operate and capable of providing a good criterion for detection of the heterogeneous degree of the polymer flooding oil deposit.
Description
Technical field
The present invention relates to a kind of detection method for Polymer Flooding Reservoirs non-homogeneous degree, especially gather the method for the relation detection Reservoir Heterogeneity of moment and injector producer distance according to the product of producing well.
Background technology
Polymer flooding is a kind of flooding method to injection of polymer solution in oil reservoir.Due to add inject water viscosity, improve mobility ratio, therefore effectively can increase swept volume, improve oil recovery factor.In process of polymer flooding development, inject the nonuniformity of for a long time washing away easily aggravation oil reservoir of fluid to high infiltration strip, cause polymer solution to ooze band or macropore channelling along high, reduce the swept volume of polymer solution, have a strong impact on the effect of the follow-up exploitation measure of oil reservoir.Along with polymer flooding application increasingly extensive, improve the efficiency of displacement of polymer solution, the detection carrying out oil reservoir non-homogeneous degree is significant.
At present, detection for Polymer Flooding Reservoirs nonuniformity attracts wide attention, the method of main employing is tracer agent detection technique, but this technology needs to carry out special test, costly and impact produce, be necessary to set up a kind of method only utilizing oil-water well Production development data just can carry out the detection of Polymer Flooding Reservoirs nonuniformity.
Summary of the invention
The object of this invention is to provide a kind of detection method for Polymer Flooding Reservoirs non-homogeneous degree, the method can evaluate the nonuniformity of oil reservoir, divide the heterogeneous body region of different brackets, judge the possibility that macropore exists, thus provide theoretical foundation and technical support for measures such as follow-up profile control and water pluggings.
The detection method of Polymer Flooding Reservoirs non-homogeneous degree provided by the invention, the linear relationship of mainly producing poly-moment and injector-producer distance square by each producing well judges the non-homogeneous degree of Polymer Flooding Reservoirs, and the grade of division non-homogeneous degree, is specially:
(1) monitor producing well polymkeric substance output dynamic data, determine that the product of each producing well gathers the moment, make to produce the scatter diagram of poly-moment and injector-producer distance square;
(2) first linear fit is carried out to scatter diagram, calculate the residual sum residual of each data point, when the absolute value of data point residual is greater than 2, thinks that this point is singular point, deleted;
(3) all the other each data points after being rejected by singular point carry out matching again, obtain the fitting a straight line of producing poly-moment and injector-producer distance square;
(4) again ask for the standard deviation of each data point residual error, by the standard deviation of the straight line of matching difference upper and lower translation residual error, obtain two straight lines, be the separatrix differentiating nonuniformity region;
(5) the oil reservoir non-homogeneous degree of each producing well is differentiated according to the position at each producing well data point place:
The scope that two separatrix comprise is the medium region of Reservoir Heterogeneity;
Scope on the upside of upper separatrix is the weak region of Reservoir Heterogeneity;
Scope on the downside of lower separatrix is the region that Reservoir Heterogeneity is strong;
Data point is positioned at downside and gets over off-straight, shows that this oil reservoir region nonuniformity is stronger, more likely there is macropore between this well and Injection Well.
Generally speaking, between injection-production well, the difference of Reservoir Heterogeneity can engrave when product is poly-and produce significant embodiment, and nonuniformity is weak, and polymer solution evenly advances, and the product poly-moment is long; And Reservoir Heterogeneity by force, the possibility that macropore exists is large, and polymer solution easily oozes band or macropore breakthrough along high, and the product poly-moment can shorten greatly.
The present invention is on the dynamic basis of oil well production, to produce the linear relation of poly-moment and injector-producer distance square as Appreciation gist, establish the detection method of a set of Polymer Flooding Reservoirs non-homogeneous degree, the method is qualitative objective, workable, the measure such as follow-up profile control and water plugging, the distribution of the individual well note amount of adopting that can be provides technical support.
Accompanying drawing explanation
Fig. 1 is the detection method process flow diagram of Polymer Flooding Reservoirs non-homogeneous degree.
Fig. 2 is singular point method for removing schematic diagram of the present invention.
Fig. 3 is testing result schematic diagram of the present invention.
In figure: I district is the weak region of Polymer Flooding Reservoirs heterogeneous body, II district is the medium region of Polymer Flooding Reservoirs non-homogeneous degree, and III district is the region that Polymer Flooding Reservoirs heterogeneous body is strong, may there is macropore.
Embodiment
Fig. 1 is the detection method flow process of Inventive polymers oil reservoirs non-homogeneous degree.Describe the present invention in detail below in conjunction with concrete case study on implementation but do not limit practical range of the present invention.
Certain polymer flooding pilot test district, top is dark in 1970 ~ 2010m, test site oil-bearing area 1.56km
2, average effective caliper 8.1m, geologic reserve 229 × 10
4t, average pore 30%, air permeability 3100 × 10
-3μm
2, the V-factor of test site is 0.709, and nonuniformity is stronger.Pilot test district comprises Injection Well 10 mouthfuls at present, and by effect oil well 16 mouthfuls, wherein center is by effect oil well 6 mouthfuls.
This polymer flooding pilot test district dropped into exploitation in 1966, and entered the high water-cut development stage so far, each oil well proceeds to polymer flooding.Because this district's nonuniformity is more complicated, in polymer flooding process, occur altering poly-phenomenon, cause Development Response of Oilfield poor.Therefore the present invention have chosen this polymer flooding pilot test district so that the practical situations of Polymer Flooding Reservoirs non-homogeneous degree detection method to be described.
The acquisition of 1 each producing well data information
Collect the polymkeric substance output data of each individual well in pilot test district, determine that the product of each producing well gathers the moment.
The judgement of 2 singular points
Make scatter diagram that producing well produces poly-moment and injector-producer distance square to go forward side by side line linearity matching, calculate the residual values of each data point, standardization is carried out to residual error, the data point that the absolute value of residual is greater than 2, can singular point be thought.See Fig. 2, according to calculating, can think that the measurement data of S5-238 well is singular point, be deleted.
3 linear fits
Again scatter diagram is done for the data of deleting the later each producing well of singular point, makes new fitting a straight line
T＝0.0045L
2-125.02 (1)
In formula, T is for producing the poly-moment, d; For the well spacing between producing well and Injection Well, m.Again the residual values of each data point is asked for, and the standard deviation sigma of residual error.
4 marginally determine
According to fitting a straight line, straight line is distinguished up and down to the standard deviation sigma of translation residual error, obtain the separatrix that two differentiate nonuniformity regions
T＝0.0045L
2-125.02±σ (2)
The differentiation of 5 Polymer Flooding Reservoirs non-homogeneous degrees
The non-homogeneous degree of Polymer Flooding Reservoirs is divided according to separatrix.As shown in Figure 3, I district is the weak region of Polymer Flooding Reservoirs heterogeneous body, and II district is the medium region of Polymer Flooding Reservoirs non-homogeneous degree, and III district is the region that Polymer Flooding Reservoirs heterogeneous body is strong, may there is macropore.
Detect case 1
S4-240 well, it is 200 days that this well produces the poly-moment, and apart from Injection Well 273 meters, according to detection method of the present invention, this well location is in the weak region of Reservoir Heterogeneity.
Detect case 2
S5-231 well, it is 70 days that this well produces the poly-moment, and apart from Injection Well 259 meters, according to detection method of the present invention, this well location is in the medium region of Reservoir Heterogeneity.
Detect case 3
S4-32 well, it is 338 days that this well produces the poly-moment, and apart from Injection Well 318 meters, according to detection method of the present invention, this well location is in the strong region of Reservoir Heterogeneity.May macropore be there is between this well and Injection Well, need to carry out profile control, improve polymer flooding development effectiveness.
These three mouthfuls of wells all once implemented tracer monitoring, and monitoring result is consistent with testing result of the present invention.
Claims (4)
1. the detection method for Polymer Flooding Reservoirs non-homogeneous degree.It is characterized in that the relation of being produced poly-moment and injector-producer distance square by producing well is measured Polymer Flooding Reservoirs non-homogeneous degree, comprising:
(1) monitor producing well polymkeric substance output dynamic data, determine that the product of each producing well gathers the moment, make to produce the scatter diagram of poly-moment and injector-producer distance square;
(2) singular point in measurement data is got rid of;
(3) data got rid of after singular point are carried out linear regression, the linear relation of poly-moment and injector-producer distance square is produced in matching, recalculates the standard deviation of the residual sum residual error of each data point;
(4) to the standard deviation of the straight line difference upper and lower translation residual error of matching, the separatrix that two differentiate nonuniformity regions is obtained;
(5) non-homogeneous degree of Polymer Flooding Reservoirs is divided according to separatrix:
The scope that two separatrix comprise is the medium region of Reservoir Heterogeneity;
Scope on the upside of upper separatrix is the weak region of Reservoir Heterogeneity;
Scope on the downside of lower separatrix is the region that Reservoir Heterogeneity is strong;
Data point is positioned at downside and gets over off-straight, shows that this oil reservoir region nonuniformity is stronger, more likely there is macropore between this well and Injection Well.
2., according to the detection method of Polymer Flooding Reservoirs non-homogeneous degree according to claim 1, it is characterized in that, described product gather the moment for start from Injection Well note poly-, in producing well production fluid, polymer concentration is greater than the moment of 10mg/L.
3. according to the detection method of Polymer Flooding Reservoirs non-homogeneous degree according to claim 1, it is characterized in that, described Reservoir Heterogeneity is oil reservoir plane heterogeneity.
4. according to the detection method of Polymer Flooding Reservoirs non-homogeneous degree according to claim 1, it is characterized in that, the method for removing of described singular point is residual method.
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Cited By (2)
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| CN106447093A (en) * | 2016-09-12 | 2017-02-22 | 中国海洋石油总公司 | Method for measuring greasy filth output of offshore polymer flooding oil field |
| CN108952676A (en) * | 2018-07-10 | 2018-12-07 | 中国石油天然气股份有限公司 | Shale gas reservoir heterogeneity evaluation method and device |
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| CN101545368A (en) * | 2009-04-27 | 2009-09-30 | 中国石油大学(华东) | On-line depth profile control method for improving oil displacement effect of polymer of offshore production well |
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| US20060149520A1 (en) * | 2003-02-21 | 2006-07-06 | Mickaele Le Ravalec-Dupin | Method for more rapidly producing the representative stochastic model of a heterogeneous underground reservoir defined by uncertain static and dynamic data |
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| CN106447093A (en) * | 2016-09-12 | 2017-02-22 | 中国海洋石油总公司 | Method for measuring greasy filth output of offshore polymer flooding oil field |
| CN106447093B (en) * | 2016-09-12 | 2019-03-19 | 中国海洋石油集团有限公司 | A kind of measuring method of the poly- displacing oil-field greasy filth quantum of output in sea |
| CN108952676A (en) * | 2018-07-10 | 2018-12-07 | 中国石油天然气股份有限公司 | Shale gas reservoir heterogeneity evaluation method and device |
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