CN104712297A - Screening method of polymer injection inferior efficiency well and polymer gather well - Google Patents
Screening method of polymer injection inferior efficiency well and polymer gather well Download PDFInfo
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- CN104712297A CN104712297A CN201510014132.4A CN201510014132A CN104712297A CN 104712297 A CN104712297 A CN 104712297A CN 201510014132 A CN201510014132 A CN 201510014132A CN 104712297 A CN104712297 A CN 104712297A
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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
- 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
Abstract
The invention discloses a screening method of a polymer injection inferior efficiency well and a polymer gather well. The screening method of the polymer injection inferior efficiency well and the polymer gather well comprises the following steps that the cumulative oil increasing amount and the cumulative polymer producing amount of each producing well at the screen moment are calculated; a single well polymer injection effective coefficient is obtained; a coordinate system is established; the single well polymer injection effective coefficient is taken as a vertical ordinate, a single well cumulative polymer producing amount is taken as a horizontal ordinate, and a scatter diagram of the relation between the single well polymer injection effective coefficient and the single well cumulative polymer producing amount is drawn; a polymer injection superior efficiency well area and a polymer injection inferior efficiency well area are partitioned by using a mean value method; the polymer gather well area is partitioned from the polymer injection inferior efficiency well area through a K-mean value clustering algorithm; the screening method of the polymer injection inferior efficiency well and the polymer gather well uses an area where an oilfield production well located in the scatter diagram of the relation between the single well polymer injection effective coefficient and the single well cumulative polymer producing amount to screen out the polymer injection inferior efficiency well and the polymer gather well. The single well polymer injection effective coefficient and the single well cumulative polymer producing amount are taken as indexes to establish the screening method of the polymer injection inferior efficiency well and the polymer gather well, and decision instructions are provided for the optimizing of measures of oil field profile control water plugging and production allocation and injection allocation.
Description
Technical field
The present invention relates to a kind of screening technique noted poly-bad effect well and alter poly-well, belong to the technical field that production and injection proration is optimized in oil field.
Background technology
Polymer flooding is a kind of by injecting high adhesive aggregation polymer solution in oil reservoir, reaches the flooding method reducing water-oil mobility ratio, expand swept volume, improve oil recovery factor.In oilfield polymer flooding development process, the poly-bad effect well of note can cause polymer utilization ratio to reduce with the existence of altering poly-well, and the ton oil consumption amount of gathering increases considerably, and cause serious polymer waste, Development Response of Oilfield is deteriorated.Wherein, after the poly-bad effect well of note refers to injection of polymer, do not see the oil well of obvious oil increasing effect, alter the oil well that poly-well refers to that in the poly-bad effect well of note, polymer output is large.Improve the development efficiency in oil field, just must gather bad effect well to note and alter poly-well and administer, first this screen noting poly-bad effect well and altering poly-well with regard to needs.
Because oil field enters postpolymer flood from waterflooding development, the character of displacing agent there occurs great changes, the evaluation method of corresponding production index is also just different with water drive from statistical method, but does not also set up a kind of effective method to noting the screening gathering bad effect well and alter poly-well at present.The on-the-spot just simple individual well that relies on tires out oil increment to evaluate the quality of the poly-effect of individual well note, but the tired oil increment of individual well height also may mean the increase of polymer output, so this way tool bears the character of much blindness.Therefore in order to improve economic benefit, the suggestions for improvement in oil field, being necessary to set up a kind of individual well that fully utilizes and producing poly-amount and oil increment Production development data are screened the poly-bad effect well of note and altered the method for poly-well.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of screening technique noted poly-bad effect well and alter poly-well.For improving the development effectiveness of polymer flooding, the method utilize oilfield producing well to produce in the scatter diagram of poly-magnitude relation with individual well at the poly-coefficient that takes effect of note residing for region filter out to note and gather bad effect well and alter poly-well.The present invention with individual well note poly-take effect coefficient and individual well tire out produce poly-amount for Index Establishment a kind of triage techniques noted poly-bad effect well and alter poly-well, for the optimization of the measures such as oil field profile control and water plugging, production and injection proration provides decision guidance.
Technical scheme of the present invention is as follows:
Note poly-bad effect well and alter the screening technique of poly-well, comprise step as follows:
(1) collected polymer drives the oil production data of each producing well in block and produces amount of polymers data, and the tired oil increment calculating screening moment each producing well produces amount of polymers with tired; Wherein polymer flooding block refers in oil field the development block with independent injection and extraction system implementing polymer flooding;
(2) calculate the tired oil increment of individual well and the tired ratio producing amount of polymers, namely obtain the poly-coefficient that takes effect of individual well note; Described individual well refers to single producing well in polymer flooding block;
(3) set up coordinate system: poly-take effect that coefficient is ordinate with individual well note, the tired amount of polymers that produces of individual well for abscissa, make the scatter diagram that described individual well note poly-take effect coefficient and individual well produce amount of polymers relation;
(4) mean value method is utilized in step 3) mark off the poly-excellent effect well area of note and the poly-bad effect well area of note in described coordinate system:
Described mean value method is that the tired oil increment summation of producing wells all in polymer flooding block and the tired ratio producing amount of polymers summation are noted the standard value of gathering the coefficient that takes effect as individual well, in described coordinate system, the poly-excellent effect well area of note and the poly-bad effect well area of note is marked off with described standard value, namely the poly-coefficient that takes effect of described individual well note is less than the individual well of described standard value for the poly-bad effect well of note, forms the poly-bad effect well area of note in described coordinate system; The poly-coefficient that takes effect of described individual well note is more than or equal to the individual well of described standard value for the poly-excellent effect well of note, forms the poly-excellent effect well area of note in described coordinate system;
(5) divide out by altering poly-well area from the poly-bad effect well area of note by K-means clustering algorithm: the note being namely positioned at right side gathers bad effect well area for altering poly-well area; Described tired product amount of polymers of altering poly-well is large; Wherein said K-means clustering algorithm belongs to prior art, specifically see bibliography: Sun Jigui, Liu Jie, Zhao Lianyu. clustering algorithm research [J]. and Journal of Software, 2008,19 (1): 48-61;
(6) produces each regional location of loose point in described step (4), step (5) of amount of polymers relation according to described individual well note poly-take effect coefficient and individual well, determines in described polymer flooding block, whether each producing well is note gather bad effect well or alter poly-well:
When described individual well note is poly-, the loose point that coefficient and individual well produce amount of polymers relation that takes effect gathers excellent effect well area at the note of described step (4), then this individual well gathers excellent effect well for noting;
When described individual well note is poly-, the loose point that coefficient and individual well produce amount of polymers relation that takes effect gathers bad effect well area at the note of described step (4), then this individual well gathers bad effect well for noting;
When described individual well note is poly-, take effect loose point that coefficient and individual well produce amount of polymers relation gathers bad effect well area and also altering in poly-well area, then this individual well is for altering poly-well at the note of described step (5).
Advantage of the present invention:
The present invention is on the dynamic basis of oil well production, using the poly-coefficient and individual well is tired produces poly-amount as evaluation index of taking effect of individual well note, establish a kind of screening technique noted poly-bad effect well and alter poly-well, the method is qualitative objective, by force, 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 for operability and reliability.Generally speaking, the quality of producing well efficiency can on the poly-coefficient and individual well is tired produces poly-amount and make a significant impact of taking effect of individual well note, and the poly-excellent effect well of note is under the poly-amount of identical product, and tired oil increment is large, and the poly-coefficient that takes effect of individual well note is large; Note gathers bad effect well and alters poly-well under the poly-amount of identical product, and tired oil increment is little, and it is little that individual well note gathers the coefficient that takes effect.Under the poly-coefficient that takes effect of identical individual well note, alter the predominant pathway that poly-well exists polymer flow, the tired amount of gathering of producing of its individual well is much bigger.
Accompanying drawing explanation
Fig. 1 is the scatter diagram that individual well of the present invention note poly-take effect coefficient and individual well produce amount of polymers relation.
In FIG, 1, the poly-excellent effect well area of note; The poly-excellent effect well of 1-1, note; 2, the poly-bad effect well area of note; The poly-bad effect well of 2-2, note; 3, poly-well area is altered; 3-3, alter poly-well; 4, the standard value line of the poly-coefficient that takes effect of individual well note; What 5, marked off by K-means clustering algorithm alters poly-well area frame line.
Detailed description of the invention
Below in conjunction with embodiment and Figure of description, the present invention is described in detail, but is not limited thereto.
Embodiment,
Note poly-bad effect well and alter the screening technique of poly-well, comprise step as follows:
(1) collected polymer drives the oil production data of each producing well in block and produces amount of polymers data, and the tired oil increment calculating screening moment each producing well produces amount of polymers with tired; Wherein polymer flooding block refers in oil field the development block with independent injection and extraction system implementing polymer flooding;
(2) calculate the tired oil increment of individual well and the tired ratio producing amount of polymers, namely obtain the poly-coefficient that takes effect of individual well note; Described individual well refers to single producing well in polymer flooding block;
(3) set up coordinate system: poly-take effect that coefficient is ordinate with individual well note, the tired amount of polymers that produces of individual well for abscissa, make the scatter diagram that described individual well note poly-take effect coefficient and individual well produce amount of polymers relation;
(4) mean value method is utilized in step 3) mark off the poly-excellent effect well area of note and the poly-bad effect well area of note in described coordinate system:
Described mean value method is that the tired oil increment summation of producing wells all in polymer flooding block and the tired ratio producing amount of polymers summation are noted the standard value of gathering the coefficient that takes effect as individual well, in described coordinate system, the poly-excellent effect well area of note and the poly-bad effect well area of note is marked off with described standard value, namely the poly-coefficient that takes effect of described individual well note is less than the individual well of described standard value for the poly-bad effect well of note, forms the poly-bad effect well area of note in described coordinate system; The poly-coefficient that takes effect of described individual well note is more than or equal to the individual well of described standard value for the poly-excellent effect well of note, forms the poly-excellent effect well area of note in described coordinate system;
(5) divide out by altering poly-well area from the poly-bad effect well area of note by K-means clustering algorithm: the note being namely positioned at right side gathers bad effect well area for altering poly-well area; Described tired product amount of polymers of altering poly-well is large; Wherein said K-means clustering algorithm belongs to prior art, specifically see bibliography: Sun Jigui, Liu Jie, Zhao Lianyu. clustering algorithm research [J]. and Journal of Software, 2008,19 (1): 48-61;
(6) produces each regional location of loose point in described step (4), step (5) of amount of polymers relation according to described individual well note poly-take effect coefficient and individual well, determines in described polymer flooding block, whether each producing well is note gather bad effect well or alter poly-well:
When described individual well note is poly-, the loose point that coefficient and individual well produce amount of polymers relation that takes effect gathers excellent effect well area at the note of described step (4), then this individual well gathers excellent effect well for noting;
When described individual well note is poly-, the loose point that coefficient and individual well produce amount of polymers relation that takes effect gathers bad effect well area at the note of described step (4), then this individual well gathers bad effect well for noting;
When described individual well note is poly-, take effect loose point that coefficient and individual well produce amount of polymers relation gathers bad effect well area and also altering in poly-well area, then this individual well is for altering poly-well at the note of described step (5).
For trial zone, utilize screening technique of the present invention to the poly-bad effect well of trial zone screening note and alter poly-well:
Wherein, trial zone oil area 1.56km
2, average effective caliper 8.1m, average pore 30%, perm-plug method 3100 × 10-3 μm
2, coefficient of permeability variation is 0.709.Initial gas-oil ratio 43m
3/ t, oil volume factor 1.12.Crude oil underground viscosity at about 10 ~ 30mPas, ground viscosity of crude 200 ~ 600mPas.Original formation pressure 20.2MPa, saturation pressure is 12.1MPa.Prime stratum temperature 80 DEG C, current formation temperature 75 ~ 78 DEG C.Because this district's non-homogeneity is comparatively strong, in polymer flooding process, occur seriously altering poly-phenomenon, cause Development Response of Oilfield poor.
1, the tired oil increment calculating individual well produces amount of polymers with tired
With described trial zone for polymer flooding block, difference label is carried out to mouthful producing well of 19 wherein, and collect, record the oil production data of described individual well respectively and produce amount of polymers data, and the tired oil increment calculating screening moment each producing well produces amount of polymers with tired.Wherein, the individual well of producing well tire out oil increment data refer to turn poly-after individual well cumulative oil production with do not turn poly-before the difference of stable cumulative oil production.The individual well of producing well tire out produce amount of polymers data refer to turn poly-after the amount of polymers of accumulation output of individual well.
2, the poly-coefficient that takes effect of individual well note is obtained
The poly-coefficient that takes effect of individual well note is the tired oil increment of individual well and the tired ratio producing amount of polymers, according to formula
calculate, in above formula, R
psfor the poly-coefficient that takes effect of individual well note, unit t/t; Q
osfor individual well tires out oil increment, unit t; Q
psamount of polymers is produced, unit t for individual well is tired.
3, scatter diagram is made
Poly-take effect that coefficient is ordinate with individual well note, the tired amount of polymers that produces of individual well for abscissa, make the poly-coefficient that takes effect of note and produce with individual well the scatter diagram gathering magnitude relation, see Fig. 1.
4, scatter diagram be divided into the poly-excellent effect wellblock of note, the poly-bad effect wellblock of note and alter region, three, poly-wellblock
1) with tired, the tired oil increment summation calculating 19 mouthfuls of producing wells in polymer flooding block produces that to gather the ratio measuring summation be 220t/t, this is gathered the standard value of the coefficient that takes effect as individual well note, utilize mean value method to mark off the poly-excellent effect well area of note and gather bad effect well area with note;
2) utilize K-means clustering algorithm in the poly-bad effect well area of note, more poly-well area will be altered divide out.Idiographic flow is as follows:
I () selects arbitrarily 2 producing well data points as initial cluster center from the poly-bad effect well area 13 mouthfuls of producing well data points of note, wherein producing well data point is the abscissa value that this well is corresponding, and namely individual well produces amount of polymers;
(ii) distance of individual well data point abscissa and described initial cluster center abscissa is calculated;
(iii) each producing well data point is grouped into from the class at its that nearest cluster centre place;
(iv) judge whether the data point in each cluster changes, if changed, then calculate the abscissa average of data point in each cluster, namely in cluster, all individual wells produce the average of poly-amount, it can be used as new each cluster centre, repeat step (ii) ~ (iii); Otherwise cluster process terminates.
So just producing well data point can be divided into two individual wells to tire out and produce the different data group of amount of polymers, the line of demarcation numerical value in the middle of their is 19t, as standard by poly-for note bad effect well area with alter poly-well area and demarcate.
5, producing well type screening
According to each producing well distributing position in the drawings differentiate the type of producing well.Be specially: if producing well drops on the poly-excellent effect wellblock of note, illustrate that this well is for the poly-excellent effect well of note; If drop on the poly-bad effect well area of note, illustrate that this well is the poly-bad effect well of note; The note that falls gathers bad effect well and drops on simultaneously alters poly-well area, illustrates that this well exists and alters poly-macropore, for altering poly-well.Specifically see Fig. 1.
Claims (1)
1. note gathers bad effect well and alters a screening technique for poly-well, and it is characterized in that, it is as follows that the method comprising the steps of:
(1) collected polymer drives the oil production data of each producing well in block and produces amount of polymers data, and the tired oil increment calculating screening moment each producing well produces amount of polymers with tired;
(2) calculate the tired oil increment of individual well and the tired ratio producing amount of polymers, namely obtain the poly-coefficient that takes effect of individual well note;
(3) set up coordinate system: poly-take effect that coefficient is ordinate with individual well note, the tired amount of polymers that produces of individual well for abscissa, make the scatter diagram that described individual well note poly-take effect coefficient and individual well produce amount of polymers relation;
(4) mean value method is utilized in step 3) mark off the poly-excellent effect well area of note and the poly-bad effect well area of note in described coordinate system:
Described mean value method is that the tired oil increment summation of producing wells all in polymer flooding block and the tired ratio producing amount of polymers summation are noted the standard value of gathering the coefficient that takes effect as individual well, in described coordinate system, the poly-excellent effect well area of note and the poly-bad effect well area of note is marked off with described standard value, namely the poly-coefficient that takes effect of described individual well note is less than the individual well of described standard value for the poly-bad effect well of note, forms the poly-bad effect well area of note in described coordinate system; The poly-coefficient that takes effect of described individual well note is more than or equal to the individual well of described standard value for the poly-excellent effect well of note, forms the poly-excellent effect well area of note in described coordinate system;
(5) divide out by altering poly-well area from the poly-bad effect well area of note by K-means clustering algorithm: the note being namely positioned at right side gathers bad effect well area for altering poly-well area;
(6) produces each regional location of loose point in described step (4), step (5) of amount of polymers relation according to described individual well note poly-take effect coefficient and individual well, determines in described polymer flooding block, whether each producing well is note gather bad effect well or alter poly-well:
When described individual well note is poly-, the loose point that coefficient and individual well produce amount of polymers relation that takes effect gathers excellent effect well area at the note of described step (4), then this individual well gathers excellent effect well for noting;
When described individual well note is poly-, the loose point that coefficient and individual well produce amount of polymers relation that takes effect gathers bad effect well area at the note of described step (4), then this individual well gathers bad effect well for noting;
When described individual well note is poly-, take effect loose point that coefficient and individual well produce amount of polymers relation gathers bad effect well area and also altering in poly-well area, then this individual well is for altering poly-well at the note of described step (5).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114542007A (en) * | 2020-11-26 | 2022-05-27 | 中国石油天然气股份有限公司 | Method and device for plugging fluid channeling channel |
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| RU2272899C1 (en) * | 2004-08-18 | 2006-03-27 | Елена Александровна Румянцева | Method for polymeric gel-forming composition choice to increase reservoir recovery and perform waterproofing works |
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| CN114542007A (en) * | 2020-11-26 | 2022-05-27 | 中国石油天然气股份有限公司 | Method and device for plugging fluid channeling channel |
| CN114542007B (en) * | 2020-11-26 | 2024-03-26 | 中国石油天然气股份有限公司 | Method and device for plugging cross flow channel |
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