CN104419397A - High-temperature-resistant seawater-based fracturing fluid and preparation method thereof - Google Patents
High-temperature-resistant seawater-based fracturing fluid and preparation method thereof Download PDFInfo
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Abstract
The invention relates to high-temperature-resistant seawater-based fracturing fluid and a preparation method thereof. The high-temperature-resistant seawater-based fracturing fluid is prepared from the following additives in percentage by weight: 0.45-1.0% of a thickening agent, 0.6-1.5% of a clay stabilizer, 0.6-1.5% of a demulsifying discharge aiding agent, 0.01-0.03% of a gel breaker, 0.6-2.0% of a crosslinking agent and the balance of seawater, wherein the sum of the percentage by weight of each component is 100%. The high-temperature-resistant seawater-based fracturing fluid has the advantages of good sand-carrying performance, good high temperature resistance and shear resistance, good compatibility with formation fluids, small reservoir damage and the like; the fluid is prepared by directly using seawater and the conventional fluid-preparing equipment and processes are adopted so as to solve the problems of deficiency of fresh water and the like during offshore fracturing construction, by the high-temperature-resistant seawater-based fracturing fluid, the efficiency of offshore fracturing operations is increased and the cost is decreased and the high-temperature-resistant seawater-based fracturing fluid lays the foundation for the realization of large-scale offshore fracturing construction operations.
Description
Technical field
The present invention relates to a kind of high temperature resistant seawater-based fracturing fluid and preparation method thereof, can directly utilize seawater to carry out dosing, system heatproof endurance of cutting reaches 160 DEG C, can meet marine temperature reservoirs fracture technology demand.
Background technology
Marine block exploration dynamics increases year by year, and in the prospect pit of finishing drilling at present, have quite a few well depth more than 3000 meters, thermograde reaches 3.78 DEG C/m, and oil reservoir belongs to fine and close mud stone, pelitic siltstone, petroclastic rock.The oil reservoir of such oil well is fine and close, and porosity is low, and infiltration rate variance, natural production capacity is low.Need to carry out fracturing reform to such deep-well compact oil reservoir, improve the whole structure of oilfield prospecting developing.
At present, marine pressure break still adopts conventional fracturing fluid system, and need to carry out dosing with fresh water, therefore need to store a large amount of fresh water from harbour, pressure break ship on the coast berthing time is oversize, wastes a large amount of engineering times, adds production cost simultaneously; In addition, due to workship, to carry fresh water amount limited, is difficult to realize marine massive hydraulic fracture construction operation.
One large feature of offshore oil and gas field has a large amount of seawater resources, but have a strong impact on because calcium magnesium plasma causes of the fracturing fluid performance, can not directly use seawater to configure conventional fracturing fluid system.Therefore being badly in need of a kind of seawater that can directly utilize of development and carrying out the fracturing fluid system prepared, improve marine pressure break efficiency, reduce marine pressure break cost, laying the foundation for realizing the construction of marine massive hydraulic fracture.
Summary of the invention
The object of the invention is to develop and a kind ofly can carry out the seawater-based fracturing fluid system of dosing by direct seawater, system have take grittiness can good, temperature and shearing sustainability is good, with resident fluid compatibleness is good, reservoir damage is little etc. feature performance benefit, improve marine pressing crack construction efficiency, reducing pressure break cost, laying the foundation for realizing the construction of marine massive hydraulic fracture.
Described high temperature resistant seawater-based fracturing fluid implementation procedure of the present invention is:
Its composition and weight percent are: viscosifying agent 0.45-1.0%, clay stabilizer 0.6-1.5%, demulsification cleanup agent 0.6-1.5%, and gel breaker is 0.01-0.03%, linking agent 0.6-2.0%, and all the other are seawater, and each weight percentages of components sum is 100%;
Described viscosifying agent is the multipolymer of 2-acrylamide-2-methyl propane sulfonic acid salt, acrylamide, dimethyl diallyl ammonium chloride and MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride four kinds of monomers, molecular weight is between 700-900 ten thousand, and the mass ratio of four kinds of monomers is 10-20:30-40:5-10:3-5.
Described linking agent is by one or more in iron(ic) chloride, zirconium oxychloride, zirconium tetrachloride, chromium chloride, and with one or more in formaldehyde, ethylene glycol, glycerol, form with water is composite, its mass ratio is: 0.1-10:0.2-3:10-50.
Described clay stabilizer is the multipolymer of epoxy chloropropane and polyethylene polyamine.
To be that polyoxyethylated alkyl alcohol nonionogenic tenside, fluorocarbon surfactant, quaternary ammonium salt surface active agent and water are composite form described demulsification cleanup agent, and its mass ratio is 1-3:0.5-2:0.6-1.2:93.8-97.9.
Described gel breaker is the ammonium persulphate, Potassium Persulphate, Sodium Persulfate etc. of capsule form.
Above-mentioned viscosifying agent preparation method is: 2-acrylamide-2-methyl propane sulfonic acid salt, acrylamide, dimethyl diallyl ammonium chloride and MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride are made the aqueous solution of 20% ~ 30% with the ratio of mass ratio 10-20:30-40:5-10:3-5, constant temperature (40 DEG C ~ 60 DEG C), inflated with nitrogen 20 ~ 30min, add redox system (ammonium persulphate: hydrosulphite=1:2) and react 6 ~ 8h, obtain high thick clear gum thing, drying, pulverizing, obtain viscosifying agent.
Above-mentioned high temperature resistant seawater-based fracturing fluid preparation method is:
1000 parts of seawater are poured in Wu Yin agitator, opens and stir, adjustment rotating speed (about 400-800r/min), make seawater form larger whirlpool; The viscosifying agent of load weighted 4.5-10 part is slowly added in seawater, stirs 10min; Add 6-15 part clay stabilizer and 6-15 part cleanup additive, continue to stir 15-20min, make viscosifying agent completely swelling; Continue to stir, add the gel breaker of 0.1-0.3 part, then slowly add the linking agent of 6-20 part, until whirlpool disappears, during the slight projection of liquid level, stop stirring, namely form high temperature resistant seawater-based fracturing fluid finished product.
Advantage of the present invention and beneficial effect:
Carry out experimental evaluation according to industry standard " SY/T5107-2005 aqueous fracturing fluid method of evaluating performance " to the high temperature resistant seawater-based fracturing fluid system formed, the performance characteristics of this seawater-based fracturing fluid is as follows:
(1) system temperature and shearing sustainability is excellent, and meet marine 160 DEG C of temperature reservoirs fracturing reform operating technique demands, high temperature rheology can be stablized, and resistant to shearing performance is given prominence to, and is beneficial to and takes sand;
(2) system has higher liquid viscosity, lower fluid loss rate, is beneficial to pressure break and makes seam;
(3) system and resident fluid compatibleness good, residue content is low, and core damage rate is low, is beneficial to resume permeability, improves fracturing reform effect.
(4) system break colloidality can be good, breaking glue solution surface and interface tension force is low, is beneficial to the row of returning after pressure, ensures fracturing reform effect.
Accompanying drawing explanation
Fig. 1 is high temperature resistant seawater-based fracturing fluid 120 DEG C of flow curves
Fig. 2 is high temperature resistant seawater-based fracturing fluid 150 DEG C of flow curves
Embodiment
The preparation of viscosifying agent
2-acrylamide-2-methyl propane sulfonic acid salt, acrylamide, dimethyl diallyl ammonium chloride and MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride are made the aqueous solution of 30% with the ratio of mass ratio 15:40:8:5, constant temperature 60 DEG C, inflated with nitrogen 30min, add redox system (ammonium persulphate: hydrosulphite=1:2) and react 8h, obtain high thick clear gum thing, drying, pulverizing, obtain viscosifying agent.
Embodiment 1:
The seawater 1000 parts being taken from triumph marine site, Bohai Sea Gulf CB326 platform is poured in Wu Yin agitator, opens and stirs, adjustment rotating speed (about 600r/min); The viscosifying agent of load weighted 5 parts is slowly added in seawater, stirs 10min; Add 6 portions of clay stabilizers and 10 portions of cleanup additives, continue to stir 15min, make viscosifying agent completely swelling; Continue to stir, add the gel breaker of 0.3 part, then slowly add the linking agent of 6 parts, until whirlpool disappears, during the slight projection of liquid level, stop stirring, namely form high temperature resistant seawater-based fracturing fluid finished product.
Linking agent is that zirconium oxychloride, chromium chloride, glycerol and water are formulated according to mass ratio 5:0.2:0.6:20.
Clay stabilizer is the multipolymer of epoxy chloropropane and polyethylene polyamine, purchased from Beijing Shi great Order Science and Technology Ltd..
To be that polyoxyethylated alkyl alcohol nonionogenic tenside, fluorocarbon surfactant, quaternary ammonium salt surface active agent and water are composite form demulsification cleanup agent, and its mass ratio is 2:1:0.8:96.2.
Gel breaker is the ammonium persulphate of capsule form.
This system is applicable to marine 120 DEG C of reservoir fracturing improvement construction, 120 DEG C, 170s
-1, after shearing 90min, system viscosity>=200mPas, is shown in Fig. 1, meets Industry code requirements.
Embodiment 2:
The seawater taken from 1000 parts near the block BH7 well of strand, huge port, Bohai Sea Gulf is poured in Wu Yin agitator, opens and stirs, adjustment rotating speed (about 1000r/min); The viscosifying agent of load weighted 8 parts is slowly added in seawater, stirs 10min; Add 10 portions of clay stabilizers and 12 portions of cleanup additives, continue to stir 20min, make viscosifying agent completely swelling; Continue to stir, add the gel breaker of 0.1 part, then slowly add the linking agent of 20 parts, until whirlpool disappears, during the slight projection of liquid level, stop stirring, namely form high temperature resistant seawater-based fracturing fluid finished product.
Linking agent is that iron(ic) chloride, zirconium tetrachloride, chromium chloride, formaldehyde, glycerol and water are formulated according to mass ratio 2:10:0.8:0.7:3:30.
Clay stabilizer is the multipolymer of epoxy chloropropane and polyethylene polyamine, purchased from Beijing Shi great Order Science and Technology Ltd..
To be that polyoxyethylated alkyl alcohol nonionogenic tenside, fluorocarbon surfactant, quaternary ammonium salt surface active agent and water are composite form demulsification cleanup agent, and its mass ratio is 3:1.5:1.5:94.0.
Gel breaker is the ammonium persulphate of capsule form.
This system is applicable to marine 160 DEG C of reservoir fracturing improvement construction, 150 DEG C, 170s
-1, after shearing 120min, system viscosity>=100mPas, is shown in Fig. 2, meets Industry code requirements.
The feature performance benefit of system of the present invention, illustrates from table 1 and Fig. 1, Fig. 2, and system has takes that grittiness is good, heatproof endurance of cutting is good, with resident fluid compatibleness is good, reservoir damage is little, prepare the feature performance benefits such as simple; Be suitable for marine 160 DEG C of temperature reservoirs fracture technology demands.
Seawater-based fracturing fluid system salient features that table 1 is high temperature resistant
Claims (7)
1. a high temperature resistant seawater-based fracturing fluid, it is characterized in that: its composition and weight percent are: viscosifying agent 0.45-1.0%, clay stabilizer 0.6-1.5%, demulsification cleanup agent 0.6-1.5%, gel breaker is 0.01-0.03%, linking agent 0.6-2.0%, all the other are seawater, and each weight percentages of components sum is 100%.
2. high temperature resistant seawater-based fracturing fluid according to claim 1, it is characterized in that: viscosifying agent is the multipolymer of 2-acrylamide-2-methyl propane sulfonic acid salt, acrylamide, dimethyl diallyl ammonium chloride and MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride four kinds of monomers, molecular weight is between 700-900 ten thousand, and the mass ratio of four kinds of monomers is 10-20:30-40:5-10:3-5.
3. high temperature resistant seawater-based fracturing fluid according to claim 1, it is characterized in that: linking agent is by one or more in iron(ic) chloride, zirconium oxychloride, zirconium tetrachloride, chromium chloride, with one or more in formaldehyde, ethylene glycol, glycerol, form with water is composite, its mass ratio is: 0.1-10:0.2-3:10-50.
4. high temperature resistant seawater-based fracturing fluid according to claim 1, is characterized in that: clay stabilizer is the multipolymer of epoxy chloropropane and polyethylene polyamine.
5. high temperature resistant seawater-based fracturing fluid according to claim 1, it is characterized in that: to be that polyoxyethylated alkyl alcohol nonionogenic tenside, fluorocarbon surfactant, quaternary ammonium salt surface active agent and water are composite form demulsification cleanup agent, and its mass ratio is 1-3:0.5-2:0.6-1.2:93.8-97.9.
6. high temperature resistant seawater-based fracturing fluid according to claim 1, is characterized in that: gel breaker is ammonium persulphate, Potassium Persulphate or Sodium Persulfate.
7. a preparation method for high temperature resistant seawater-based fracturing fluid according to claim 1, is characterized in that: prepare in accordance with the following methods: under agitation, is slowly added in seawater by viscosifying agent, and dosage is the 0.45-1.0% of seawater; After stirring 10min, add clay stabilizer, dosage is 0.6-1.5%, continues to add cleanup additive, and dosage is 0.6-1.5%; Continue to stir 15-20min, add gel breaker, dosage is 0.01-0.03% simultaneously; Slowly add linking agent, dosage is 0.6-2.0%, is stirred to fracturing liquid and is formed evenly, has viscoelastic liquid.
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Cited By (3)
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| CN106590611A (en) * | 2016-11-17 | 2017-04-26 | 新疆正通石油天然气股份有限公司 | Fracturing fluid of crosslinking association polymer and production method thereof |
| CN106939160A (en) * | 2016-04-19 | 2017-07-11 | 山东科瑞石油工程技术研究院 | A kind of high mineralization water quality clean fracturing fluid |
| CN114561203A (en) * | 2022-04-11 | 2022-05-31 | 西南石油大学 | High-salinity water-based delayed cross-linking gel fracturing fluid and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106939160A (en) * | 2016-04-19 | 2017-07-11 | 山东科瑞石油工程技术研究院 | A kind of high mineralization water quality clean fracturing fluid |
| CN106590611A (en) * | 2016-11-17 | 2017-04-26 | 新疆正通石油天然气股份有限公司 | Fracturing fluid of crosslinking association polymer and production method thereof |
| CN114561203A (en) * | 2022-04-11 | 2022-05-31 | 西南石油大学 | High-salinity water-based delayed cross-linking gel fracturing fluid and preparation method thereof |
| CN114561203B (en) * | 2022-04-11 | 2023-08-29 | 西南石油大学 | High-mineralization water-based delayed crosslinking gel fracturing fluid and preparation method thereof |
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