CN1699499A - Low-molecular environmentally-friendly fracturing fluid and use of recovery liquid thereof - Google Patents
Low-molecular environmentally-friendly fracturing fluid and use of recovery liquid thereof Download PDFInfo
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- CN1699499A CN1699499A CN 200510042832 CN200510042832A CN1699499A CN 1699499 A CN1699499 A CN 1699499A CN 200510042832 CN200510042832 CN 200510042832 CN 200510042832 A CN200510042832 A CN 200510042832A CN 1699499 A CN1699499 A CN 1699499A
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Abstract
The invention relates to a low-molecular environmentally-friendly fracturing fluid and use of recovery liquid, wherein the fracturing fluid comprises low molecular thickening agent, cross linking agent, water, pH regulator, crude oil demulsification agent, surface active agent, clay stabilizer and bactericidal agent, thus no glue-breaking agent is needed, and very good rheological property can be achieved.
Description
One, technical field:
The present invention relates to a kind of employed fracturing liquid of fracturing yield increasing technology that is used for oil well or gasser, be specifically a kind of be viscosifying agent, low-molecular environmentally-friendly fracturing fluid that can recycling and the application of reclaiming liquid thereof with the low-molecular(weight)polymer.
Two, background technology:
In the prior art, employed fracturing liquid mainly is to be the fracturing liquid of viscosifying agent with the polymer in the oil-gas field fracturing transformation, the shortcoming that ubiquity is following: 1, owing to must use gel breaker in the fracturing liquid, gel breaker is reducing of the fracturing fluid viscosity all the time in fracturing process, affect the reliability of construction.2, fracturing liquid formed filter cake and concentrated solution on every side thereof in the stratum can not break glue or have only the broken glue of part, and easy residual polymer causes serious pollution to supporting crack in the supporting crack of stratum.3, fracturing liquid must return after pressing crack construction is finished and drain into ground, to returning the processing that drains into ground liquids, strict requirement is arranged all both at home and abroad, and the liquid of the row of returning can not be used again, if it is not effectively handled, easily environment is polluted.
Three, summary of the invention:
The object of the present invention is to provide a kind of with low-molecular(weight)polymer as viscosifying agent, can be to returning low-molecular environmentally-friendly fracturing fluid that the liquids recovery that drains into ground handles, utilizes and the application of reclaiming liquid thereof
For achieving the above object, the technical solution used in the present invention is:
Low-molecular environmentally-friendly fracturing fluid, its special character is: fracturing liquid of the present invention is the mixture with following composition and weight part:
90～99.5 parts in water
0.25～1.0 part of low molecule viscosifying agent
0.1～10.0 part of linking agent
Also contain in the fracturing liquid of the present invention:
0.0001～2.0 part of pH regulator agent
0.03～0.1 part of crude oil demulsifier
0.01～1.0 part in tensio-active agent
0.2～2.5 part of clay stabilizer
0.05～1.0 part in sterilant
Above-mentioned low molecule viscosifying agent is for playing guar gum, sesbania gum, fenugreek gum and the derivative thereof of viscosifying action in the aqueous solution, molecular weight is positioned at 1 * 10
5～4 * 10
5Between.
Above-mentioned linking agent is the organic or inorganic compound of boron.
Above-mentioned tensio-active agent is for being used for reducing hydro carbons emulsifying agent, alkyl sulfonates emulsifying agent, the alkylsurfuric acid salt emulsifying agent of the water and the interfacial tension of oil in water.
Above-mentioned clay stabilizer is KCl, NH
4The single-component of Cl and cationic quaternary ammonium salt polymkeric substance or many component substance.
Above-mentioned sterilant is formaldehyde, luxuriant dialdehyde or dodecylbenzyl ammonium chloride.
Above-mentioned crude oil demulsifier is alkyl polymerization ethers, alkyl polymerization alcohols, alkyl sulfonates, alkylsurfuric acid salt compounds.
9, low-molecular environmentally-friendly fracturing fluid according to claim 2 is characterized in that: described pH regulator agent is NaOH, Na
2CO
3, NaHCO
3
The application of the recovery liquid of low-molecular environmentally-friendly fracturing fluid, fracturing liquid of the present invention are stored in the container after row's liquid filtering desanding is returned on the stratum behind pressing crack construction, leave standstill more than 1 hour, and profit is separated automatically, and it is stand-by to take off layer aqueous solution; With lower aqueous solution: concentration is 0.0001～10.0% pH regulator agent solution, mixes by 100: 0.0001～10.0 volume ratio, forms fracturing liquid.
The present invention compares with respect to prior art, its fundamentally improvement from the prescription, thereby have following advantage:
1, fracturing liquid need not to use gel breaker, thereby has avoided of the fracturing fluid lasting viscosity reduction in the pumping process, has highly stable rheological property.
2, after pressure break, it relies on the intrinsic pH environment on stratum, and the fracturing liquid system is degraded to short molecular chain, can clean supporting crack and reduce to its injury minimum.
3, of the fracturing fluidly return discharge opeing and reclaim this, can use as fracturing liquid again, reduce the pollution of discharging of waste liquid, can save a large amount of water and chemical additive; For the arid area of insufficient water sources, water resources that not only can saves valuable also can effectively shorten the construction operation time.
Four, embodiment:
Low-molecular environmentally-friendly fracturing fluid of the present invention is the mixture with following composition and weight part:
90～99.5 parts in water
0.25～1.0 part of low molecule viscosifying agent
0.1～10.0 part of linking agent
Also contain in the fracturing liquid of the present invention:
0.0001～2.0 part of pH regulator agent
0.03～0.1 part of crude oil demulsifier
0.01～1.0 part in tensio-active agent
0.2～2.5 part of clay stabilizer
0.05～1.0 part in sterilant
Described low molecule viscosifying agent is for playing guar gum, sesbania gum, fenugreek gum and the derivative thereof of viscosifying action in the aqueous solution, molecular weight is positioned at 1 * 10
5～4 * 10
5Between.Linking agent is the organic or inorganic compound of boron.Tensio-active agent is for being used for reducing hydro carbons emulsifying agent, alkyl sulfonates emulsifying agent, the alkylsurfuric acid salt emulsifying agent of the water and the interfacial tension of oil in water.Clay stabilizer is KCl, NH
4The single-component of Cl and cationic quaternary ammonium salt polymkeric substance or many component substance.Sterilant is formaldehyde, luxuriant dialdehyde or dodecylbenzyl ammonium chloride.Crude oil demulsifier is alkyl polymerization ethers, alkyl polymerization alcohols, alkyl sulfonates, alkylsurfuric acid salt compounds.The pH regulator agent is NaOH, Na
2CO
3, NaHCO
3Fracturing liquid need not to use gel breaker, thereby has avoided of the fracturing fluid lasting viscosity reduction in the pumping process, has highly stable rheological property.After pressure break, it relies on the intrinsic pH environment on stratum, and the fracturing liquid system is degraded to short molecular chain, can clean supporting crack and reduce to its injury minimum.
The application of the recovery liquid of low-molecular environmentally-friendly fracturing fluid: fracturing liquid of the present invention is stored in the container after row's liquid filtering desanding is returned on the stratum behind pressing crack construction, leaves standstill more than 1 hour, and profit is separated automatically, and it is stand-by to take off layer aqueous solution; With lower aqueous solution: concentration is 0.0001～10.0% pH regulator agent solution, mixes by 100: 0.0001～10.0 volume ratio, forms fracturing liquid.Of the fracturing fluidly return discharge opeing and reclaim this, can use as fracturing liquid again, reduce the pollution of discharging of waste liquid, can save a large amount of water and chemical additive; For the arid area of insufficient water sources, water resources that not only can saves valuable also can effectively shorten the construction operation time.
Specific embodiment 1:
10m at the scene
3Add 9900Kg water in the container, under with pump circulation or agitator condition of stirring, slowly add 30Kg low molecular weight hydroxypropyl guar gum, add 100Kg Repone K, 10Kg crude oil demulsifier, 5Kg sodium lauryl sulphate, 3Kg yellow soda ash, 30Kg formaldehyde then respectively, continue to circulate or stirred 30 minutes, so that liquid mixing is abundant, form solution A
1
During pressing crack construction, in the infusion solution A
1The time, linking agent is pressed and solution A
1, with solution A
1: linking agent=100 liter: 1.5 liters volume ratio is mixed and is formed fracturing liquid.
Above fracturing liquid is recommended in the well temperature and uses for the oil well that is no more than 60 ℃.
Specific embodiment 2:
At 2m
3Add clear water 900Kg in the container, under with pump circulation or agitator condition of stirring, slowly add 100Kg yellow soda ash, and it is dissolved fully, it is stand-by to be mixed with solution B.
After returning row's liquid filtering desanding from the stratum behind pressing crack construction in " specific embodiment 1 ", be stored in 10m
3In the container, leave standstill more than 1 hour, profit is separated automatically, take off a layer aqueous solution C
1Stand-by.During pressing crack construction, in the infusion solution C
1The time, solution B is pressed and solution C
1With solution C
1: solution B=100 liter: 1.0 liters volume ratio is mixed and is formed fracturing liquid.
This fracturing liquid is recommended in the well temperature and uses for the oil well that is no more than 60 ℃.
Specific embodiment 3:
10m at the scene
3Add 9900Kg water in the container, under with pump circulation or agitator condition of stirring, slowly add 35Kg low molecular weight hydroxypropyl guar gum, add 100Kg Repone K, 10Kg crude oil demulsifier, 5Kg sodium lauryl sulphate, 3Kg yellow soda ash, 30Kg formaldehyde then respectively, continue to circulate or stirred 30 minutes, so that liquid mixing is abundant, form solution A
2
During pressing crack construction, in the infusion solution A
2The time, linking agent is pressed and solution A
2With solution A
2: linking agent=100 liter: 1.5 liters volume ratio is mixed and is formed fracturing liquid.
It is that 60 ℃～80 ℃ oil well uses that above fracturing liquid is recommended in the well temperature.
Specific embodiment 4:
Stand-by by the method obtain solution B in " specifically implementing 2 ".
After returning row's liquid filtering desanding from the stratum behind pressing crack construction in " specific embodiment 3 ", be stored in 10m
3In the container, leave standstill more than 1 hour, profit is separated automatically, take off a layer aqueous solution C
2Stand-by.During pressing crack construction, in the infusion solution C
2The time, solution B is pressed and solution C
2With solution C
2: solution B=100 liter: 1.0 liters volume ratio is mixed and is formed fracturing liquid.
It is that 60 ℃～80 ℃ oil well uses that this fracturing liquid is recommended in the well temperature.
Claims (10)
1, low-molecular environmentally-friendly fracturing fluid is characterized in that: fracturing liquid of the present invention is the mixture with following composition and weight part:
90～99.5 parts in water
0.25～1.0 part of low molecule viscosifying agent
0.1～10.0 part of linking agent.
2, low-molecular environmentally-friendly fracturing fluid according to claim 1 is characterized in that: contain in the fracturing liquid of the present invention:
0.0001～2.0 part of pH regulator agent
0.03～0.1 part of crude oil demulsifier
0.01～1.0 part in tensio-active agent
0.2～2.5 part of clay stabilizer
0.05～1.0 part in sterilant
3, low-molecular environmentally-friendly fracturing fluid according to claim 1 and 2 is characterized in that: described low molecule viscosifying agent is for playing guar gum, sesbania gum, fenugreek gum and the derivative thereof of viscosifying action in the aqueous solution, molecular weight is positioned at 1 * 10
5～4 * 10
5Between.
4, low-molecular environmentally-friendly fracturing fluid according to claim 1 and 2 is characterized in that: described linking agent is the organic or inorganic compound of boron.
5, low-molecular environmentally-friendly fracturing fluid according to claim 2 is characterized in that: described tensio-active agent is for being used for reducing hydro carbons emulsifying agent, alkyl sulfonates emulsifying agent, the alkylsurfuric acid salt emulsifying agent of the water and the interfacial tension of oil in water.
6, low-molecular environmentally-friendly fracturing fluid according to claim 2 is characterized in that: described clay stabilizer is KCl, NH
4The single-component of Cl and cationic quaternary ammonium salt polymkeric substance or many component substance.
7, low-molecular environmentally-friendly fracturing fluid according to claim 2 is characterized in that: described sterilant is formaldehyde, luxuriant dialdehyde or dodecylbenzyl ammonium chloride.
8, low-molecular environmentally-friendly fracturing fluid according to claim 2 is characterized in that: described crude oil demulsifier is alkyl polymerization ethers, alkyl polymerization alcohols, alkyl sulfonates, alkylsurfuric acid salt compounds.
9, low-molecular environmentally-friendly fracturing fluid according to claim 2 is characterized in that: described pH regulator agent is NaOH, Na
2CO
3, NaHCO
3
10, the application of the recovery liquid of low-molecular environmentally-friendly fracturing fluid according to claim 1 and 2, it is characterized in that: fracturing liquid of the present invention is stored in the container after row's liquid filtering desanding is returned on the stratum behind pressing crack construction, leave standstill more than 1 hour, profit is separated automatically, and it is stand-by to take off layer aqueous solution; With lower aqueous solution: concentration is 0.0001～10.0% pH regulator agent solution, mixes by 100: 0.0001～10.0 volume ratio, forms fracturing liquid.
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|---|---|---|---|
| CNB2005100428320A CN1329473C (en) | 2005-06-17 | 2005-06-17 | Low-molecular environmentally-friendly fracturing fluid and use of recovery liquid thereof |
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|---|---|---|---|
| CNB2005100428320A CN1329473C (en) | 2005-06-17 | 2005-06-17 | Low-molecular environmentally-friendly fracturing fluid and use of recovery liquid thereof |
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| Publication Number | Publication Date |
|---|---|
| CN1699499A true CN1699499A (en) | 2005-11-23 |
| CN1329473C CN1329473C (en) | 2007-08-01 |
Family
ID=35475748
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|---|---|---|---|
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|---|---|
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