CN102660243B - Drag reducer for overcoming high-pressure under-injection of water-injection well in low-permeability reservoir - Google Patents
Drag reducer for overcoming high-pressure under-injection of water-injection well in low-permeability reservoir Download PDFInfo
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- CN102660243B CN102660243B CN 201210113678 CN201210113678A CN102660243B CN 102660243 B CN102660243 B CN 102660243B CN 201210113678 CN201210113678 CN 201210113678 CN 201210113678 A CN201210113678 A CN 201210113678A CN 102660243 B CN102660243 B CN 102660243B
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Abstract
The invention relates to a drag reducer for overcoming high-pressure under-injection of a water-injection well in a low-permeability reservoir. The drag reducer comprises: by mass, 15 to 17% of amino tri(methylene phosphonic acid), 5% of 2-phosphonobutane-1,2,4-tricarboxylic acid, 9.2% of a potassium salt of hexamethylene diamine tetra(methylene phosphonic acid), 5% of polyoxyethylene octylphenolether-10, 5% of N,N-bis(2-hydroxyethyl)dodecanamide, and balance water. The drag reducer has good drag reduction performances, can obviously reduce the pressure of a water injection well, can improvean injection capacity and a water suction capacity of a water injection well, is conducive to oil reservoir energy supplement, maintains a certain oil reservoir pressure, guarantees high efficiency and stable production of an oil well, improves the recovery efficiency of crude oil, and realizes economic benefits.
Description
Technical field
The present invention relates to the flow improver of low-permeability oil deposit water injection well, in order to improve the water injection well water-retaining capacity.
Background technology
In the development of low-permeability oil reservoir process, because the lithology densification, rate of permeation is low, seepage resistance is big, the injecting process high pressure often occurs and shorts phenomenon.The most direct problem is exactly the stress level difficulty that keeps oil reservoir, and recovery ratio is low, is difficult to realize ordinary production.Short on the problem at solution low-permeability oil deposit high pressure at present, adopt well stimulation shortcomings such as big, the consuming time length of difficulty, validity period weak point to occur.Occurred taking effect after existing flow improver adds poor, cost is high, corrosion phenomenon such as strong.This has greatly restricted the development and use of low-permeability oil deposit.
Summary of the invention
The object of the present invention is to provide a kind of flow improver of shorting for low-permeability oil deposit water injection well high pressure, this flow improver is functional, can significantly improve the water injection well water-retaining capacity.
For reaching above technical purpose, the invention provides following technical scheme.
The present invention is used for the flow improver that the low-permeability oil deposit water injection well is transformed, and is made up of according to its mass ratio following each component:
Amino Trimethylene Phosphonic Acid 15～17 quality %,
2-phosphate-1,2,4-butane tricarboxylate 5 quality %,
Hexanediamine tetramethyl fork phosphonic acids sylvite 9.2 quality %,
Polyoxyethylene octyl phenol ether-10 5 quality %,
N, N-double hydroxyethyl laurylamide 5 quality %,
All the other are water.
The present invention mainly considers the ability of unblocking and injection increasing ability and reduction oil-water two-phase flow interfacial tension, and adopting main acid, tensio-active agent is its main effective constituent, and adopting clean-out system, inhibiter, dirt stripper (permeate agent) is its ancillary component.
The main acid Amino Trimethylene Phosphonic Acid is the organic acid system, and shortcomings such as inconvenience are used in the severe corrosive, strong and stimulating and the production that have overcome strong acid, do not corrode with tubing string, pit shaft; Keep advantages such as its strong solubility, slightly acidic, can reach effective scale removal; And reaction product all is soluble salts, and no secondary sedimentation produces.
Tensio-active agent adopts polyoxyethylene octyl phenol ether-10, and according to interfacial tension oil-displacement mechanism and theory, the ultra low interfacial tension flooding system can only be applied to middle and high rate of permeation (〉=50mD) oil reservoir, for example alkali/tensio-active agent/polymer ternary combination flooding.Since hypotonic, special LOW PERMEABILITY RESERVOIR shout radius less than the saturating oil reservoir of middle and high infiltration, the hollow billet resistance of residual oil globule can be very big.By the capillary force formula
As can be known, it is more little to shout radius, and the hollow billet resistance is more big.Can reduce the displacement resistance from two aspects at present: reduce interfacial tension σ and change contact angle θ.Activating these oil droplets need be even lower oil water interfacial tension, generally must be reduced to 10
-5～10-
7The mN/m order of magnitude, in addition lower.And in fact, the surfactant system that form this ultra low interfacial tension is very difficult.But, when rock is not absolute oleophylic, this moment θ 0, cos θ reduces along with the increase of θ, and then capillary force Pc is reduced.So make the residual oil globule activation by injecting promoting agent, can reduce interfacial tension, can also change reservoir wettability, inject water hollow billet resistance thereby reduce.By tensio-active agent commonly used has been carried out the interfacial tension screening, the tensio-active agent of the reduction oil-water two-phase flow interfacial tension that filters out is polyoxyethylene octyl phenol ether-10(OP-10).In low and wide scope, interfacial tension can be reduced to 10
-3The ultralow value of the mN/m order of magnitude can reduce significantly and inject water in the resistance to flow of hollow billet, improves the fluid flow ability.
Clean-out system of the present invention is 2-phosphate-1,2, the 4-butane tricarboxylate.
Inhibiter of the present invention is hexanediamine tetramethyl fork phosphonic acids sylvite.
Permeate agent of the present invention is N, N-double hydroxyethyl laurylamide.
Compared with prior art, beneficial effect of the present invention is: form the flow improver system that suitable low-permeability oil deposit water injection well high pressure is shorted, reduce water injection well pressure, improve the water injection well injectability, be conducive to replenishing to keep certain sand pressure of oil reservoir energy, thereby guarantee the efficient stable yields of oil well, improve oil recovery factor, realize economic benefit.
Embodiment
One, is used for the preparation of the flow improver that low-permeability oil deposit water injection well high pressure shorts
Embodiment 1
Main acid is the Amino Trimethylene Phosphonic Acid acid solution of 15 quality %, clean-out system is the 2-phosphate-1 of 5 quality %, 2, the 4-butane tricarboxylate, inhibiter is the hexanediamine tetramethyl fork phosphonic acids sylvite of 9.2 quality %, tensio-active agent be 5 quality % polyoxyethylene octyl phenol ether-10(OP-10), dirt stripper (permeate agent) is the N of 5 quality %, N-double hydroxyethyl laurylamide.
Embodiment 2
Main acid is the Amino Trimethylene Phosphonic Acid acid solution of 16 quality %, clean-out system is the 2-phosphate-1 of 5 quality %, 2, the 4-butane tricarboxylate, inhibiter is the hexanediamine tetramethyl fork phosphonic acids sylvite of 9.2 quality %, tensio-active agent be 5 quality % polyoxyethylene octyl phenol ether-10(OP-10), dirt stripper (permeate agent) is the N of 5 quality %, N-double hydroxyethyl laurylamide.
Embodiment 3
Main acid is the Amino Trimethylene Phosphonic Acid acid solution of 17 quality %, clean-out system is the 2-phosphate-1 of 5 quality %, 2, the 4-butane tricarboxylate, inhibiter is the hexanediamine tetramethyl fork phosphonic acids sylvite of 9.2 quality %, tensio-active agent be 5 quality % polyoxyethylene octyl phenol ether-10(OP-10), dirt stripper (permeate agent) is the N of 5 quality %, N-double hydroxyethyl laurylamide.
Two, be used for the performance test of the flow improver that low-permeability oil deposit water injection well high pressure shorts
The flow improver system of embodiment 1, embodiment 2, embodiment 3 preparations is placed under 80 ℃ the condition, leaves standstill and observed respectively in 1 day, 7 days, 20 days, the phenomenon that does not all have layering or medicament system to separate out, the flow improver of inventing has good auto-stability; Flow improver is mixed according to mass ratio 1:1 with injection water, be placed under 80 ℃ the condition, leave standstill and observed respectively in 1 day, 7 days, 20 days, the phenomenon that does not all have layering or medicament system to separate out, the flow improver of inventing has good auto-stability with the injection glassware for drinking water; Flow improver is mixed according to mass ratio 1:1 with simulated formation water, be placed under 80 ℃ the condition, leave standstill and observed respectively in 1 day, 7 days, 20 days, the phenomenon that does not all have layering or medicament system to separate out, the flow improver of inventing and simulated formation glassware for drinking water have good auto-stability.
Above-mentioned flow improver is diluted to the concentration of 250ppm, choose mean permeability and be 3mD, porosity and be 10% rock core and carry out displacement test, confined pressure 15MPa, record data, behind the displacement 50PV, displacement reaches balance, finishes data analysis as can be known, and the step-down rate of the flow improver solution of embodiment 1, embodiment 2, embodiment 31 preparations reaches 17%, 18%, 21% respectively.
It is that 1mD, porosity are that 8% oil reservoir carries out field experiment that the flow improver of embodiment 1 preparation is applied to average well depth 2500m, 80 ℃ of average formation temperature, reservoir mean permeability, and the well head water injection pressure is at 18MPa, and individual well injection allocation amount is at 20m
3/ d, flow improver add the concentration that concentration is 250ppm, regularly detect water injection well pressure and real fluence, by to add after the flow improver 3 months the production data analysis as can be known, the water injection well oil pressure 1.9MPa that on average descends, the step-down rate is 11%.
It is that 0.6mD, porosity are that 7% oil reservoir carries out field experiment that the flow improver of embodiment 3 preparation is applied to average well depth 2500m, 80 ℃ of average formation temperature, reservoir mean permeability, and the well head water injection pressure is at 20MPa, and individual well injection allocation amount is at 20m
3/ d, flow improver add the concentration that concentration is 250ppm, regularly detect water injection well pressure and real fluence, by to add after the flow improver 3 months the production data analysis as can be known, the water injection well oil pressure 1.7MPa that on average descends, the step-down rate is 9%.
Claims (1)
1. one kind is used for the flow improver that low-permeability oil deposit water injection well high pressure is shorted, and is made up of according to its mass ratio following each component:
Amino Trimethylene Phosphonic Acid 15～17 quality %,
2-phosphate-1,2,4-butane tricarboxylate 5 quality %,
Hexanediamine tetramethyl fork phosphonic acids sylvite 9.2 quality %,
Polyoxyethylene octyl phenol ether-10 5 quality %,
N, N-double hydroxyethyl laurylamide 5 quality %,
All the other are water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210113678 CN102660243B (en) | 2012-04-18 | 2012-04-18 | Drag reducer for overcoming high-pressure under-injection of water-injection well in low-permeability reservoir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210113678 CN102660243B (en) | 2012-04-18 | 2012-04-18 | Drag reducer for overcoming high-pressure under-injection of water-injection well in low-permeability reservoir |
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| Publication Number | Publication Date |
|---|---|
| CN102660243A CN102660243A (en) | 2012-09-12 |
| CN102660243B true CN102660243B (en) | 2013-10-09 |
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| CN 201210113678 Expired - Fee Related CN102660243B (en) | 2012-04-18 | 2012-04-18 | Drag reducer for overcoming high-pressure under-injection of water-injection well in low-permeability reservoir |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101092559A (en) * | 2006-06-24 | 2007-12-26 | 常彦荣 | Water flooding added agent in use for watering oil field, and preparation method |
| CN101121883A (en) * | 2007-07-31 | 2008-02-13 | 中国石油天然气股份有限公司 | Water soluble friction reducer used for thick oil well and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9034802B2 (en) * | 2006-08-17 | 2015-05-19 | Schlumberger Technology Corporation | Friction reduction fluids |
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2012
- 2012-04-18 CN CN 201210113678 patent/CN102660243B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101092559A (en) * | 2006-06-24 | 2007-12-26 | 常彦荣 | Water flooding added agent in use for watering oil field, and preparation method |
| CN101121883A (en) * | 2007-07-31 | 2008-02-13 | 中国石油天然气股份有限公司 | Water soluble friction reducer used for thick oil well and preparation method thereof |
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| CN102660243A (en) | 2012-09-12 |
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Granted publication date: 20131009 Termination date: 20140418 |