CN102418506A - Chemical flooding injection method for improving recovery rate of crude oil - Google Patents
Chemical flooding injection method for improving recovery rate of crude oil Download PDFInfo
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- CN102418506A CN102418506A CN2012100054869A CN201210005486A CN102418506A CN 102418506 A CN102418506 A CN 102418506A CN 2012100054869 A CN2012100054869 A CN 2012100054869A CN 201210005486 A CN201210005486 A CN 201210005486A CN 102418506 A CN102418506 A CN 102418506A
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Abstract
The invention discloses a chemical flooding injection method for improving recovery rate of crude oil. The method comprises the following steps of: (1) injecting 0.1 to 0.5 physical volume (PV) of 1,000 to 2,500 mg/L emulsifier plug after polymer flooding; and (2) injecting 0.2 to 0.5 PV of binary composite plug of 500 to 2,500 mg/L polymer with the molecular weight of 20 to 30 million and 0.1 to 0.3 weight percent surfactant. According to the chemical flooding injection method, the residual oil obtained after the polymer flooding is emulsified by injecting the emulsifier plug to form oil-in-water emulsion, and the oil-in-water emulsion is displaced by using binary composite flooding, so that the recovery rate of the crude oil is improved by over 20 percent.
Description
Technical field
The present invention relates to a kind of method for implanting that improves oil recovery factor chemical flooding part.
Background technology
In recent years, technology such as polymer flooding, surfactant flooding and combination flooding have all obtained the achievement that attracts people's attention, and technical level also reaches its maturity.Polymer displacement of reservoir oil tech is unique with it to be master to improve sweep efficiency, be the mechanism of oil displacement of assisting with the raising displacement efficiency, recovery ratio is improved more than 10% on the basis of water drive again.But still have substantial oil to residue in the stratum behind the polymer flooding; Especially in residuing in, in the less permeable layer; Drive some substituted technique that adopt the back and gather; Drive the back substituted technique and carried out field test and application at Daqing oil field as gathering like: ternary composite driving, the result shows that ternary composite driving can improve recovery ratio 10% again gathering to drive on the basis, but since the use of a large amount of alkaline agents not only to stratum and the huge injury of oil well generation; The consumption of simultaneously a large amount of alkaline agents has also increased the cost of oil exploitation, and these have all restricted its further industrialization promotion and have used; Gather and drive back employing binary combination flooding oil tech, come further to improve recovery ratio with the ultralow interfacial tension principle, but prove through field experiment, the effect that improves recovery ratio is also unsatisfactory.Therefore how finding more efficient methods is respectively to gather the displacing oil-field problem demanding prompt solution to gathering that residual oil after driving further taps the latent power.
Summary of the invention
The objective of the invention is to overcome the deficiency that exists in the background technology, a kind of raising oil recovery factor chemical flooding method for implanting is provided.Chemical flooding method for implanting among the present invention carries out emulsification through injecting the residual oil that an emulsification slug will gather earlier after driving, and forms emulsion oil-in-water, utilizes binary combination flooding to carry out displacement again, to improve oil recovery factor more than 20%.
The technical scheme that the present invention taked is: the chemical flooding method for implanting of raising oil recovery factor of the present invention is following: 1. gather drive the back implantation concentration be 1000-2500mg/L emulsifier slug 0.1-0.5PV; 2. the molecular weight that reinjects is that 2000-3000 ten thousand, concentration are that polymer, the concentration of 500-2500mg/L is the surfactant binary composite slug 0.2-0.5PV of 0.1-0.3% (wt).
The beneficial effect that the present invention had is: (1) alkali-free has been avoided the infringement of the use of a large amount of alkaline agent to stratum and equipment; (2) the emulsification slug that injects is because the viscoplasticity of himself can improve oil displacement efficiency and swept volume; (3) the emulsification slug that injects is in emulsified crude oil, and its viscosity has been regulated permeability on the vertical profile, and the injection along with follow-up binary is driven has increased swept volume, improves oil recovery factor.
Description of drawings
Fig. 1 is that injection pressure and recovery ratio are with injection rate variation relation curve.
The specific embodiment
Below in conjunction with specific embodiment the present invention is further specified:
Improve the chemical flooding method for implanting one of oil recovery factor: 1. to drive the back implantation concentration be 1700mg/L emulsifier slug 0.3PV gathering; 2. polymer, concentration that the molecular weight that reinjects is 2,500 ten thousand, concentration is 1500mg/L are the surfactant binary composite slug 0.4PV of 0.3% (wt).Wherein the emulsifier slug consists of: functional form polymer 1000mg/L, T-60 are 500mg/L, add sodium phosphate trimer 200mg/L, and surplus is a water.
Improve the chemical flooding method for implanting two of oil recovery factor: 1. to drive the back implantation concentration be 2250mg/L emulsifier slug 0.2PV gathering; 2. polymer, concentration that the molecular weight that reinjects is 2,500 ten thousand, concentration is 1500mg/L are the surfactant binary composite slug 0.4PV of 0.3% (wt).Wherein the emulsifier slug consists of: functional form polymer 1500mg/L, OP-2 are 500mg/L, add citric acid 250mg/L, and surplus is a water.
Improve the chemical flooding method for implanting three of oil recovery factor: 1. to drive the back implantation concentration be 1900mg/L emulsifier slug 0.25PV gathering; 2. polymer, concentration that the molecular weight that reinjects is 2,500 ten thousand, concentration is 1500mg/L are the surfactant binary composite slug 0.4PV of 0.3% (wt).Wherein the emulsifier slug consists of: functional form polymer 1200mg/L, OP-10 are 600mg/L, add ethylenediamine tetra-acetic acid 100mg/L, and surplus is a water.
Laboratory experiment: with said method one is example:
One, preparation oil displacement system:
(1) compound method one described emulsification slug stirred 1 hour, and is subsequent use;
(2) compound method one described binary combination flooding slug stirred 1 hour, and is subsequent use;
(3) simulated formation water: inject the Simulated Water of water preparation by grand celebration, salinity is 6170mg/L;
(4) rock core: artificial consolidated core, air permeability 711mD.
Two, injecting program
(1) rock core is vacuumized saturation simulation formation water, gaging hole crack volume;
(2) survey the rock core water phase permeability;
(3) in rock core, inject oil and no longer there are flowing out with constant flow pump to the rock core production end till, calculate oil saturation;
(4) 45 ℃ of ageing oils are more than 24 hours;
(5) 1. water drive: in rock core, inject water with constant flow pump with constant flow rate, displacement to rock core production end moisture content reaches 98%; 2. gather and drive: continue in rock core, to inject 1500mg/L polymer 0.57PV; 3. follow-up water drive: water drive to production end moisture 98%; 4. emulsifier: drive and inject emulsification slug 0.3PV; 5. binary is driven: inject binary combination flooding 0.4PV, 6. follow-up water drive: till water drive to the production end moisture 98%.
Gather and drive the back and add the emulsification slug and can improve recovery ratio altogether more than 20%, overall recovery factor reaches 83.6%, than gather drive the back directly binary drive and improve recovery ratio at least 10%.
Functional form polymer described in the foregoing description is that application number is the prepared polymer of method among the embodiment 1 in the application documents of 201110093855.X.
Claims (7)
1. chemical flooding method for implanting that improves oil recovery factor, it is characterized in that: described a kind of chemical flooding method for implanting is following: 1. to drive the back implantation concentration be 1000-2500mg/L emulsifier slug 0.1-0.5PV gathering; 2. the molecular weight that reinjects is that 2000-3000 ten thousand, concentration are that polymer, the concentration of 500-2500mg/L is the surfactant binary composite slug 0.2-0.5PV of 0.1-0.3% (wt).
2. the chemical flooding method for implanting of raising oil recovery factor according to claim 1 is characterized in that: described emulsifier slug consists of the mixture of polymer, emulsifier, and wherein the concentration ratio of polymer and emulsifier is 0.5-5:1.
3. according to the chemical flooding method for implanting of claim 1,2 described raising oil recovery factors, it is characterized in that: described polymer is the functional form polymer.
4. the chemical flooding method for implanting of raising oil recovery factor according to claim 2; Emulsifier is any one or a few the mixture among T-20, T-60, OP-2, OP-4, OP-10, AEO-4, AEO-5, the S-80.
5. the chemical flooding method for implanting of raising oil recovery factor according to claim 2; It is characterized in that: add the stabilizing agent of 100-500 mg/L in the emulsification slug, described stabilizing agent is any one or a few the mixture in ethylenediamine tetra-acetic acid, sodium phosphate trimer, citric acid, the oxalic acid.
6. the chemical flooding method for implanting of raising oil recovery factor according to claim 1 is characterized in that: described emulsifier slug concentration is 1500mg/L.
7. the chemical flooding method for implanting of raising oil recovery factor according to claim 1 is characterized in that: polymer molecular weight is 2,500 ten thousand in the described binary composite slug, concentration is 1500mg/L, and the table agent concentration of living is 0.3%.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102650206A (en) * | 2012-04-25 | 2012-08-29 | 中国石油天然气股份有限公司 | Method for improving recovery ratio of non-homogeneous pay |
| CN103321621A (en) * | 2013-06-24 | 2013-09-25 | 大庆大华宏业石油工程技术有限公司 | Heavy oil displacement method using wedged vicious slug |
| CN104790928A (en) * | 2015-04-07 | 2015-07-22 | 东北石油大学 | Method for increasing crude oil recovery ratio of post-polymer flooding slug combination system |
| CN104861948A (en) * | 2014-02-21 | 2015-08-26 | 中国石油化工股份有限公司 | Composition used for increasing polymer solution viscosity, and applications thereof |
| CN105696988A (en) * | 2014-12-09 | 2016-06-22 | 中国海洋石油总公司 | Determination method applied to combination flooding efficient oil flooding scheme under industrial well pattern condition and combination flooding efficient oil flooding scheme |
| CN105696986A (en) * | 2014-12-09 | 2016-06-22 | 中国海洋石油总公司 | Novel combination flooding oil flooding experiment/test simulating method |
| CN105696989A (en) * | 2014-12-09 | 2016-06-22 | 中国海洋石油总公司 | Determination method for combination flooding extra-high-efficiency oil flooding scheme for high viscosity and extra-ultralow interfacial tension system and combination oil flooding scheme for system |
| CN105696985A (en) * | 2014-12-09 | 2016-06-22 | 中国海洋石油总公司 | Determination method for combination flooding efficient oil flooding scheme under condition of four-injection nine-mining well pattern and combination flooding efficient oil flooding scheme |
| CN107605444A (en) * | 2016-07-12 | 2018-01-19 | 中国石油化工股份有限公司 | A kind of heavy crude reservoir polymer displacement of reservoir oil method |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102650206A (en) * | 2012-04-25 | 2012-08-29 | 中国石油天然气股份有限公司 | Method for improving recovery ratio of non-homogeneous pay |
| CN103321621B (en) * | 2013-06-24 | 2016-12-28 | 大庆大华宏业石油工程技术有限公司 | Viscous crude wedge shape viscosity slug oil displacement method |
| CN103321621A (en) * | 2013-06-24 | 2013-09-25 | 大庆大华宏业石油工程技术有限公司 | Heavy oil displacement method using wedged vicious slug |
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| CN104861948A (en) * | 2014-02-21 | 2015-08-26 | 中国石油化工股份有限公司 | Composition used for increasing polymer solution viscosity, and applications thereof |
| CN105696988A (en) * | 2014-12-09 | 2016-06-22 | 中国海洋石油总公司 | Determination method applied to combination flooding efficient oil flooding scheme under industrial well pattern condition and combination flooding efficient oil flooding scheme |
| CN105696986A (en) * | 2014-12-09 | 2016-06-22 | 中国海洋石油总公司 | Novel combination flooding oil flooding experiment/test simulating method |
| CN105696989A (en) * | 2014-12-09 | 2016-06-22 | 中国海洋石油总公司 | Determination method for combination flooding extra-high-efficiency oil flooding scheme for high viscosity and extra-ultralow interfacial tension system and combination oil flooding scheme for system |
| CN105696985A (en) * | 2014-12-09 | 2016-06-22 | 中国海洋石油总公司 | Determination method for combination flooding efficient oil flooding scheme under condition of four-injection nine-mining well pattern and combination flooding efficient oil flooding scheme |
| CN105696986B (en) * | 2014-12-09 | 2018-06-26 | 中国海洋石油总公司 | A kind of NEW TYPE OF COMPOSITE drives oil displacement experiment/test simulation method |
| CN105696985B (en) * | 2014-12-09 | 2018-07-24 | 中国海洋石油总公司 | Four notes nine adopt the determination method and the efficient flooding method of combination flooding of the efficient flooding method of combination flooding under the conditions of well pattern |
| CN105696988B (en) * | 2014-12-09 | 2019-02-22 | 中国海洋石油总公司 | The efficient Drainage process of combination flooding and its determining method under the conditions of industrialness well pattern |
| CN105696989B (en) * | 2014-12-09 | 2019-02-22 | 中国海洋石油总公司 | The glutinous special extra-high effect Drainage process of ultralow interfacial tension system of height and its determining method |
| CN104790928A (en) * | 2015-04-07 | 2015-07-22 | 东北石油大学 | Method for increasing crude oil recovery ratio of post-polymer flooding slug combination system |
| CN107605444A (en) * | 2016-07-12 | 2018-01-19 | 中国石油化工股份有限公司 | A kind of heavy crude reservoir polymer displacement of reservoir oil method |
| CN107605444B (en) * | 2016-07-12 | 2020-01-24 | 中国石油化工股份有限公司 | Polymer flooding method for heavy oil reservoir |
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Application publication date: 20120418 |