CN104747149B - The detection method of passage is altered in the agent of binary combination flooding - Google Patents
The detection method of passage is altered in the agent of binary combination flooding Download PDFInfo
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- CN104747149B CN104747149B CN201510033326.9A CN201510033326A CN104747149B CN 104747149 B CN104747149 B CN 104747149B CN 201510033326 A CN201510033326 A CN 201510033326A CN 104747149 B CN104747149 B CN 104747149B
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Abstract
The invention provides a kind of detection method of altering passage for the agent of binary combination flooding.Improve the agent existed in oil recovery factor process and alter for oilfield injection compound, surfactant binary complexing agent the problem causing oil increasing effect difference, the present invention establishes and a kind ofly reflects that the detection method that passage is altered in degree and agent is altered in the agent of binary combination flooding.First collect the polymer in the oil production of oil well, Liquid output and production fluid and surfactant concentration data, then calculate synthetic obstetric agent and increase oily index, and increase oily index characteristic tracing pattern discriminating agent according to synthetic obstetric agent and alter degree and passage is altered in agent.The present invention is based on actual Production performance data, the detection of agent being altered to passage is simple and reliable, is conducive to the agent of Timeliness coverage binary combination flooding and alters, implement effective close measure, improves the effect of increasing production of binary combination flooding further.
Description
Technical field
The present invention relates to and a kind ofly alter the detection method of passage for agent in binary combination flooding oilfield development process, the method of passage is altered in the agent in particular, provided based on field produces dynamic data, provides technical support for improving binary combination flooding development effectiveness, further raising binary combination flooding oil recovery rate.
Background technology
Binary combination flooding is on the basis of conventional water drive, adds chemical agent (polymer and surfactant), thus improves sweep efficiency and displacement efficiency, reach the object improving oil recovery factor to injection water.The agent of binary complex oil displacing Tanaka is altered passage and is mainly degree and grows different cracks, high permeability formation and the height that formed on stream oozes type and macropore channel type predominant pathway.The existence that passage is altered in agent causes the chemical agent (polymer and surfactant) injected along high permeability zone channelling, to be broken through too early in oil well, has had a strong impact on the oil increasing effect of chemical flooding.The agent of chemical agent is altered and not only be result in effect of increasing production difference, adds the intractability of development cost and production fluid simultaneously.The chemical agent (polymer and surfactant) wanting efficiency utilization to inject, reaches better effect of increasing production, and the key issue that first will solve is that degree is altered in the agent detected in oil field and passage is altered in agent.
At present, the detection that passage is altered in the agent of binary combination flooding has caused extensive concern both domestic and external, but research work mainly concentrates on moisture content, the oil production aspect of oil field static parameter and oil well, judge that precision is low, feature is altered in agent when simultaneously cannot embody polymer and surfactant acting in conjunction in binary combination flooding.
In sum, in binary combination flooding oilfield development process, chemical agent agent alter passage detection and characterize also do not set up an effective method.In binary combination flooding process, because the existence of passage is altered in agent, having a strong impact on the oil increasing effect of chemical agent, having made a large amount of chemical agents alter passage inefficient displacement along with injecting water along agent.Improve binary combination flooding development effectiveness, further improve binary combination flooding oil recovery rate, just must determine that passage is altered in channelling degree and agent, passage measure altered by convenient enforcement sealing agent, and therefore to alter the detection of passage significant in agent.
Summary of the invention
The present invention, based on the oil well production dynamic change characterization of binary combination flooding oil field, establishes the agent of a kind of binary combination flooding and alters Air conduct measurement technology, provides technical support for improving binary combination flooding development effectiveness, further raising binary combination flooding oil recovery rate.
Terminological interpretation:
1, binary combination flooding takes effect: after referring to that chemical agent (polymer and surfactant) injects stratum, and swept volume increases, and displacement efficiency improves, and therefore compared with before chemical injection, after chemical injection, oil production increases.When certain monthly oil production after chemical injection is greater than the average monthly oil production of chemical injection first trimester, think that binary combination flooding takes effect this moment.
2, inject the pore volume injected of fluid: refer to and inject the volume of fluid and the ratio of voids volume, symbol adopts PV to represent.Such as reservoir pore volume V
0=10000m
3, inject fluid volume V=40000m
3, represent with PV and be exactly
The invention provides a kind of detection method of altering passage for the agent of binary combination flooding, it utilizes synthetic obstetric agent to increase oily index characteristic curve and measures oil field, is specially:
(1) constant duration collects polymer concentration in the oil production of binary combination flooding oilfield, Liquid output, injection liquid and production fluid and surfactant concentration, the time from chemical agent (polymer and surfactant) is bet in oil field to test;
(2) from when binary combination flooding takes effect and output polymer concentration and surfactant concentration are all greater than 0.015 times of respective implantation concentration, according to polymer concentration and the surfactant concentration of output liquid measure and production fluid, calculate to amount to produce poly-amount and amount to and produce surfactant amount;
Amount to that to produce poly-amount be that the ratio of output polymer concentration and injection of polymer concentration is multiplied by Liquid output, that is:
In formula, V
p-amount to and produce poly-amount, m
3; C
p-propolymer concentration in-production fluid, mg/L; C
p-inj-injection of polymer concentration, mg/L; V
l-output liquid measure, m
3;
Amounting to product surfactant amount is that output surfactant concentration is multiplied by Liquid output with the ratio injecting surfactant concentration, that is:
In formula, V
s-amount to and produce surfactant amount, m
3; C
s-prosurfactant concentration in-production fluid, %; C
s-inj-inject surfactant concentration, %; V
l-output liquid measure, m
3;
(3) will amount to and produce poly-amount with amounting to and produce surfactant amount and sue for peace and obtain amounting to synthetic obstetric dosage;
(4) ask the logarithm amounting to synthetic obstetric dosage and tired oil increment ratio, obtain synthetic obstetric agent and increase oily index;
(5) increase oily exponential sum with synthetic obstetric agent respectively and inject the pore-body product of fluid for ordinate and abscissa mapping, obtain synthetic obstetric agent and increase oily index characteristic curve;
(6) increase oily index characteristic tracing pattern according to described synthetic obstetric agent, differentiate that degree is altered in the agent in binary combination flooding oil field and channel type is altered in agent;
It is convex that described synthetic obstetric agent increases oily index characteristic tracing pattern, then oil field agent alters degree seriously, there is the agent of macropore channel type and alters passage;
It is spill that described synthetic obstetric agent increases oily index characteristic tracing pattern, then to alter degree weak in oil field agent, exists highly to ooze type agent and alter passage.
Due to the impact of various uncertain factor, the product agent obtained increases oily index characteristic curve and inevitably there is rough phenomenon, therefore needs to carry out smooth treatment to curve.Conventional smoothing method is least-squares regression approach, the method calculates simple, but due to error or artificial origin, it is unsane to return, and for making data smoothing have robustness, this patent adopts sane smooth treatment method to carry out smooth treatment to above-mentioned data, the method can see bibliography (Cui Dong. the processing method [J] that a kind of data are steadily and surely smooth. computer application, 2008,28 (7), 1678-1680).
It is the routine operation in the routine work of oil field that constant duration collects polymer concentration and surfactant concentration in the oil production of oil well, Liquid output and injection liquid and production fluid, time, above-mentioned " constant duration " was preferably one month to test from chemical agent (polymer and surfactant) is bet in oil field.
Generally speaking, the existence that passage is altered in agent can make characteristic of production dynamic generation marked change, and these behavioral characteristics increase being mainly reflected in synthetic obstetric agent in the change of oily index.Can infer, whether oil reservoir alters passage containing agent, and agent is in various degree altered, and the Changing Pattern that product agent increases oily index all will have respective feature.
The present invention is based on the Production development data of binary combination flooding oil field, establish and a kind ofly detect the oil field agent of binary combination flooding and alter the method that passage is altered in degree and agent, the method is qualitative objective, actual operation is strong, provides technical support for improving binary combination flooding development effectiveness, further raising binary combination flooding oil recovery rate.
Accompanying drawing explanation
Fig. 1 is that the product agent of oil well GO7-32-3135 increases oily index characteristic curve.
Fig. 2 is that the product agent of oil well GO7-32-166 increases oily index characteristic curve.
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.
Channel detection methods is altered for the agent of Gudao oilfield binary compound Pilot trial block.Gudao oilfield binary compound Pilot trial block oil area is 0.94km
2, oil in place is 267 × 10
4t, average oil saturation is 0.72, and average pore is 0.34, and air permeability is 3400 × 10
-3μm
2, coefficient of permeability variation is 0.74.The existing Injection Well of this block 10 mouthfuls, by effect oil well 14 mouthfuls.
The present invention have selected 2 mouthfuls of wells to illustrate that the practice situation of channel detection methods is altered in agent in guide trial zone.
Embodiment 1
Illustrate that oil well produces agent and increases oily index characteristic curve plotting process for oil well 1 below.
Liquid output and oil production and polymer concentration and surfactant concentration is chosen from the monthly production report of oil well 1, calculate tired oil increment and amount to synthetic obstetric dosage, and then obtain produce agent increase oily index, from trial zone, inject chemical agent start to calculate the pore volume injected injecting fluid, increase oily exponential sum with synthetic obstetric agent respectively and inject the pore-body product of fluid for the mapping of transverse and longitudinal coordinate, obtain producing agent and increase oily index characteristic curve (see Fig. 1).
The agent of oil well 1 synthetic obstetric increases oily index characteristic curve on the whole in obvious concave body, and according to detection method of the present invention, then to alter degree weak in the agent of this mouthful of well, exists highly to ooze type agent and alter passage;
Embodiment 2
The making step that the product agent of oil well 2 increases oily index characteristic curve is identical with oil well 1.
Oil well 2 produces agent and increases oily index characteristic curve (see Fig. 2) on the whole in obvious convex shape, and according to detection method of the present invention, the agent of this mouthful of well alters degree seriously, there is the agent of macropore channel type and alters passage.
Claims (3)
1. alter the detection method of passage for polymer, the agent of surfactant binary combination flooding, it is characterized in that, utilize synthetic obstetric agent to increase oily index characteristic curve and binary combination flooding oil field is measured, comprising:
(1) constant duration collects polymer concentration in the oil production of binary combination flooding oilfield, Liquid output, injection liquid and production fluid and surfactant concentration, the time from oil field stake polymer and surfactant to test;
(2) according to polymer concentration and the surfactant concentration of output liquid measure and production fluid, calculate to amount to produce poly-amount and amount to and produce surfactant amount,
Describedly amount to that to produce poly-amount be that the ratio of output polymer concentration and injection of polymer concentration is multiplied by Liquid output, that is:
In formula, V
p-amount to and produce poly-amount, m
3; C
p-propolymer concentration in-production fluid, mg/L; C
p-inj-injection of polymer concentration, mg/L; V
l-output liquid measure, m
3,
Described product surfactant amount of amounting to is that output surfactant concentration is multiplied by Liquid output with the ratio injecting surfactant concentration, that is:
In formula, V
s-amount to and produce surfactant amount, m
3; C
s-prosurfactant concentration in-production fluid, %; C
s-inj-inject surfactant concentration, %; V
l-output liquid measure, m
3;
(3) will amount to and produce poly-amount with amounting to and produce surfactant amount and sue for peace and obtain amounting to synthetic obstetric dosage;
(4) calculate the logarithm amounting to synthetic obstetric dosage and tired oil increment ratio, obtain synthetic obstetric agent and increase oily index;
(5) increase oily exponential sum with synthetic obstetric agent respectively and inject the pore-body product of fluid for ordinate and abscissa mapping, obtain synthetic obstetric agent and increase oily index characteristic curve;
(6) increase oily index characteristic tracing pattern according to described synthetic obstetric agent, differentiate that the type that passage is altered in degree and agent is altered in the agent in binary combination flooding oil field:
It is convex that described synthetic obstetric agent increases oily index characteristic tracing pattern, then oil field agent alters degree seriously, there is the agent of macropore channel type and alters passage;
It is spill that described synthetic obstetric agent increases oily index characteristic tracing pattern, then to alter degree weak in oil field agent, exists highly to ooze type agent and alter passage.
2. the detection method of passage is altered in binary combination flooding agent as claimed in claim 1, it is characterized in that, amount to and produce poly-amount and amount to that to produce surfactant amount be calculate from when binary combination flooding takes effect and output polymer concentration and surfactant concentration are all greater than 0.015 times of respective implantation concentration.
3. the detection method of passage is altered in binary combination flooding agent as claimed in claim 1, it is characterized in that, also comprises and the synthetic obstetric agent obtained in above-mentioned steps (5) is increased the step that oily index characteristic curve carries out sane smooth treatment.
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| CN105735952B (en) * | 2016-02-29 | 2018-05-08 | 烟台智本知识产权运营管理有限公司 | A kind of method that medium to high permeable oil reservoir improves oil recovery factor |
| CN105781511B (en) * | 2016-02-29 | 2018-04-17 | 烟台智本知识产权运营管理有限公司 | A kind of method of medium to high permeable oil reservoir volume increase |
| CN106055843B (en) * | 2016-07-01 | 2019-05-14 | 北京金士力源科技有限公司 | A kind of poly- drive produces the quantitative analysis method and device of poly- curve in the process |
| CN111764879B (en) * | 2020-07-08 | 2021-06-15 | 中国石油大学(华东) | Evaluation method for flow channeling of binary composite flooding agent |
| CN112727413A (en) * | 2021-01-09 | 2021-04-30 | 西南石油大学 | Oil extraction method combining fine water injection and chemical combination flooding of complex fault block oil reservoir |
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| CN1166964C (en) * | 2001-12-13 | 2004-09-15 | 刘安建 | Tracing technique for detecting micro substance between wells in oil field |
| CN100489266C (en) * | 2005-07-07 | 2009-05-20 | 中国石油大学(北京) | Method for detecting fluid-channeling channel of oil field |
| CN102003176A (en) * | 2010-10-19 | 2011-04-06 | 大庆油田有限责任公司 | Quantitative test method for residual polymer in polymer flooding reservoir rocks |
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