CN100404638C - High-density fracturing fluid - Google Patents
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- CN100404638C CN100404638C CNB2006100906810A CN200610090681A CN100404638C CN 100404638 C CN100404638 C CN 100404638C CN B2006100906810 A CNB2006100906810 A CN B2006100906810A CN 200610090681 A CN200610090681 A CN 200610090681A CN 100404638 C CN100404638 C CN 100404638C
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- 239000012530 fluid Substances 0.000 title abstract description 35
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000654 additive Substances 0.000 claims abstract description 12
- 230000000996 additive effect Effects 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims description 49
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- JHJLBTNAGRQEKS-UHFFFAOYSA-M sodium bromide Chemical group [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 claims description 16
- 230000003750 conditioning effect Effects 0.000 claims description 15
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 14
- 235000015110 jellies Nutrition 0.000 claims description 11
- 239000008274 jelly Substances 0.000 claims description 11
- 235000013311 vegetables Nutrition 0.000 claims description 11
- DPDMMXDBJGCCQC-UHFFFAOYSA-N [Na].[Cl] Chemical compound [Na].[Cl] DPDMMXDBJGCCQC-UHFFFAOYSA-N 0.000 claims description 10
- 239000000499 gel Substances 0.000 claims description 10
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 8
- 229910052796 boron Inorganic materials 0.000 claims description 8
- 235000017550 sodium carbonate Nutrition 0.000 claims description 7
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 7
- 239000004160 Ammonium persulphate Substances 0.000 claims description 6
- 229920002907 Guar gum Polymers 0.000 claims description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical group OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 6
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical group [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 6
- 235000019395 ammonium persulphate Nutrition 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 6
- 239000000665 guar gum Substances 0.000 claims description 6
- 229960002154 guar gum Drugs 0.000 claims description 6
- 235000010417 guar gum Nutrition 0.000 claims description 6
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 229920013818 hydroxypropyl guar gum Polymers 0.000 claims description 5
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 4
- 244000250129 Trigonella foenum graecum Species 0.000 claims description 4
- 235000001484 Trigonella foenum graecum Nutrition 0.000 claims description 4
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 235000001019 trigonella foenum-graecum Nutrition 0.000 claims description 4
- 229910052726 zirconium Inorganic materials 0.000 claims description 4
- 244000007835 Cyamopsis tetragonoloba Species 0.000 claims description 3
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 claims description 3
- -1 hydroxypropyl carboxy methyl Chemical group 0.000 claims description 3
- 239000004159 Potassium persulphate Substances 0.000 claims description 2
- 244000275012 Sesbania cannabina Species 0.000 claims description 2
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 2
- 235000019394 potassium persulphate Nutrition 0.000 claims description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 2
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 2
- 150000001642 boronic acid derivatives Chemical group 0.000 claims 1
- 239000002131 composite material Substances 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 238000004132 cross linking Methods 0.000 abstract description 9
- 229910017053 inorganic salt Inorganic materials 0.000 abstract description 5
- 230000006378 damage Effects 0.000 abstract description 4
- 239000003431 cross linking reagent Substances 0.000 abstract description 2
- 238000001914 filtration Methods 0.000 abstract description 2
- 230000002159 abnormal effect Effects 0.000 abstract 2
- 229920001938 Vegetable gum Polymers 0.000 abstract 1
- 230000000844 anti-bacterial effect Effects 0.000 abstract 1
- 239000003899 bactericide agent Substances 0.000 abstract 1
- 230000003111 delayed effect Effects 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 239000002562 thickening agent Substances 0.000 abstract 1
- 125000001183 hydrocarbyl group Chemical group 0.000 description 10
- 238000010276 construction Methods 0.000 description 9
- 150000001875 compounds Chemical class 0.000 description 8
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 6
- 239000004215 Carbon black (E152) Substances 0.000 description 6
- 229930195733 hydrocarbon Natural products 0.000 description 6
- 239000002775 capsule Substances 0.000 description 5
- 239000004927 clay Substances 0.000 description 5
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- 239000004971 Cross linker Substances 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 4
- PRPAGESBURMWTI-UHFFFAOYSA-N [C].[F] Chemical compound [C].[F] PRPAGESBURMWTI-UHFFFAOYSA-N 0.000 description 4
- 239000002585 base Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 3
- 230000002706 hydrostatic effect Effects 0.000 description 3
- 208000014674 injury Diseases 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 230000008961 swelling Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004945 emulsification Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 206010010214 Compression fracture Diseases 0.000 description 1
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 125000005211 alkyl trimethyl ammonium group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003094 microcapsule Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
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- Lubricants (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention provides a high-density fracturing fluid formula for improving the density of a water-based fracturing fluid by using inorganic salt. Is characterized in that: the formula is prepared from the following components in percentage by weight: 26-50% of a weighting agent; 0.3-1.0% of a vegetable gum thickening agent; 0.1-2.0% of a cross-linking agent; 0.5-1.0% of pH value regulator; 0.002-0.3% of a gel breaker; 0.05-0.5% of cleanup additive; 0.03-0.2% of a bactericide; 30-73% of water. The high-density fracturing fluid has adjustable density which can reach 1.51g/cm3Even higher. The fracturing fluid also has the characteristics of delayed crosslinking, low friction resistance, low filtration loss, good high temperature resistance, shear resistance and rheological property, complete gel breaking, low damage to a reservoir stratum and the like, the performance of a heavy fracturing fluid formula system is properly adjusted by combining the reservoir stratum characteristic, and the fracturing fluid can be applied to an abnormal high-pressure deep well. Therefore, the temperature of the molten metal is controlled,the successful development of the heavy fracturing fluid provides reliable guarantee for the exploration, oil testing and exploitation of the ultra-deep well with abnormal high pressure.
Description
Technical field
The present invention relates to the oil field compression fracture technical field, is a kind of fracturing liquid, the high density fracturing liquid that particularly a kind of fracturing reform that can be adapted to high pressure, deep-well, ultra deep well is used.
Background technology
At present, present widely used fracturing liquid has:
1 aqueous fracturing fluid: aqueous fracturing fluid is at present most widely used general, has especially developed since organic boron and the capsule breaker, can satisfy the fracturing reform on the medium and high temperature stratum basically.It is gelatinizing agent that aqueous fracturing fluid mostly adopts with vegetable jelly (as guar gum, fenugreek gum or polymkeric substance etc.), but this class fracturing liquid is perplexing us in the clay swelling of zone of interest always, because of clay swelling causes injury to the stratum, finally influences oil and gas production.Density is only at 1.03g/cm
3About, just powerless for the processing of high temperature, high pressure, deep-well.
2 oil base fracturing fluids: oil base fracturing fluid is adapted to the transformation of low temperature, low pressure, hypotonic, high water-sensitive formation.Advantage is not injure the stratum, and shortcoming is the configuration complex process, and cost is higher, and construction risk is bigger.And density is at 0.8g/cm
3About, can not be applicable to the fracturing reform of high temperature, high pressure, deep-well.
The last fracturing liquid of 3 bubbles: steep the transformation that last fracturing liquid is adapted to low temperature, low pressure, hypotonic or special hypotonic, high water-sensitive hydrocarbon-bearing pool.Steep the widespread use abroad of last fracturing liquid.China's consumption is also increasing year by year, and technology is constantly perfect.Its density is at 0.9g/cm
3About, so can not be applicable to the fracturing reform of high temperature, high pressure, deep-well.
4 emulsification fracturing liquids: the emulsification fracturing liquid is adapted to the transformation of low temperature, low pressure, hypotonic, high water-sensitive formation.This technology is wider at the seventies amount ratio, also has the configuration complex process, shortcomings such as less stable.Its density is at 0.8～0.9g/cm
3About, so can not be applicable to the fracturing reform of high temperature, high pressure, deep-well.
5 clean fracturing fluids: clean fracturing fluid is a new technology of China, and being one does not have a solid fracturing liquid.Be adapted to the transformation of low temperature, low pressure, hypotonic or special LOW PERMEABILITY RESERVOIR, great advantage is not injure the stratum.Its density is at 0.9～1.0g/cm
3About, owing to the restriction of rheological property, can not be applicable to the fracturing reform of high temperature, high pressure, deep-well.
Therefore, in the existing fracturing liquid system, the density of water base, oil base, emulsion, clean fracturing fluid is 0.8～1.03g/cm
3, can not satisfy the needs of high temperature high pressure deep well hydrocarbon-bearing pool fracturing reform.
The Chinese patent publication number is the patent application of CN1524920A, and this invention provides a kind of organic boron delay cross linking plant gum fracturing fluid.This of the fracturing fluid purpose is: for the inorganic borate linking agent that overcomes general aqueous fracturing fluid does not possess the delay cross linking effect, temperature resistant capability is poor, frictional resistance height, the deficiency of the broken glue difficulty of organic zirconium and organic titanium cross-linking agent.The crosslinked plant gum fracturing fluid of this organic boron is formulated by following component: vegetable jelly viscosifying agent 0.2～0.8%; Sterilant 0.05～0.3%; Linking agent 0.1～1.0%; Gel breaker 0.001～0.2%; Clay stabilizer 0.1～2.0%; PH value conditioning agent 0.05～0.3%; Cleanup additive 0.1～1.0%; Water 95～97%.Its effect is: 1, have the controllable delay cross linking time, be 1～12min time of lag; 2, have resistant to elevated temperatures effect, temperature resistant capability reaches 158 ℃; 3, fast, the broken glue of broken glue is thorough, and the supporting crack flow conductivity is injured less than 30%.But, only add Repone K 0.1～2.0% in this organic boron delay cross linking plant gum fracturing fluid as clay stabilizer, purpose is to suppress clay swelling, the protection borehole wall; Purpose is not to improve of the fracturing fluid density.So only use Repone K 0.1～2.0%, and of the fracturing fluid density do not bring up to and adapts to the needed density of high pressure and deep well, can not satisfy the needs of high temperature high pressure deep well hydrocarbon-bearing pool pressure break equally.Because the of the fracturing fluid density that high pressure and deep well hydrocarbon-bearing pool needs is at 1.31～1.51g/cm
3Or higher, so organic boron delay cross linking plant gum fracturing fluid can not be applied to the high pressure oil wells pressure break equally.
Along with deepening continuously of exploratory development, note abnormalities strong well, deep-well, ultra deep well constantly increases, and the operation pressure that this class well needs in pressing crack construction is very high, usually reaches more than the 100Mpa, because the operation pressure deficiency, pressing crack construction is transfinited press and fail.For surpressure, deep-well, ultra deep well, it is very limited utilizing conventional fracturing string and the work of adjustment discharge capacity to reduce operation pressure.
Summary of the invention
Low in order to overcome existing fracturing liquid density, can not satisfy the deficiency of high temperature high pressure deep well hydrocarbon-bearing pool pressure break needs, the purpose of this invention is to provide a kind of high density fracturing liquid.This fracturing liquid can not only be finished the wellfracturing needs, and can improve the oil well liquid column hydrostatic pressure, reduces operation pressure, satisfies high temperature high pressure deep well hydrocarbon-bearing pool pressure break needs, ensures that pressing crack construction carries out smoothly.
The technical solution used in the present invention is: by add the Sodium Bromide weighting agent and the sodium-chlor weighting agent of different ratios in fracturing liquid, prepare highdensity fracturing liquid.Each composition weight ratio of high density fracturing liquid that the present invention proposes is as follows:
Weighting agent 4～50%;
Vegetable jelly viscosifying agent 0.3～1.0%;
Linking agent 0.1～2.0%;
PH value conditioning agent 0.5～1.0%;
Gel breaker 0.002～0.3%;
Cleanup additive 0.05～0.5%;
Sterilant 0.03～0.2%;
Water 30～73%;
Each component content and be 100%.
What weighting agent adopted in the above-mentioned prescription is inorganic salt, and Sodium Bromide, sodium-chlor or Potassium Bromide can be wherein a kind of inorganic salt, also can be the compounded combination of two kinds of inorganic salt.According to the temperature and pressure of on-the-spot fractured well, combination in proportion is mixed with the fracturing liquid that is fit to on-the-spot fractured well density, and optimum weight ratio is 26～50%.
The vegetable jelly viscosifying agent adopts polygalactomannan in the above-mentioned prescription, as guar gum, hydroxypropylguar gum, carboxymethyl guar glue, hydroxypropyl carboxy methyl guar gum, fenugreek gum and sesbania gum, the best is hydroxypropylguar gum and fenugreek gum, and optimum weight ratio is 0.4～0.7%.
Linking agent adopts crosslinked inorganic salt or its complex compound of cis vicinal hydroxyl groups in the polygalactomannan in the above-mentioned prescription, and as borate, organic boron zirconates or organic zirconium etc., best linking agent is organic boron and organic zirconium, and optimum weight ratio is 0.2～0.5%.
PH value conditioning agent adopts strong base-weak acid salt or alkali in the above-mentioned prescription, as yellow soda ash, sodium bicarbonate or sodium hydroxide.The optimal ph conditioning agent is 0.08～0.15% for the yellow soda ash optimum weight ratio.
Gel breaker adopts (microcapsule) ammonium persulphate or Potassium Persulphate in the above-mentioned prescription, and optimum weight ratio is 0.02～0.04%.
Cleanup additive adopts fluorocarbon surfactant, hc-surfactant and low mass molecule alcohol in the above-mentioned prescription, forms as methyl alcohol, ethanol.
What sterilant adopted in the above-mentioned prescription is alkyl trimethyl ammonium salt, formaldehyde, glutaraldehyde, and optimum weight ratio is 0.03～0.2%.
Beneficial effect of the present invention:
From improving fracturing liquid density, improve the oil well liquid column hydrostatic pressure and reduce operation pressure, guarantee that pressing crack construction is the new thought of a preparing fracturing fluid smoothly.Bring up to 1.51g/cm such as fracturing liquid density
3The time, the oil gas well for 6000 meters of well depths can improve hydrostatic column 30.84Mpa, thereby reduces operation pressure 30.84Mpa.For the fracturing reform of surpressure, deep-well, ultra deep well, improve the construction success ratio, guarantee construction safety, have crucial meaning.By changing the fracturing liquid prescription, improve of the fracturing fluid density, be outstanding contributions of the present invention.The present invention is by a large amount of indoor formula tests, and is on probation through the pressure break of on-the-spot strong well, finished purpose of the present invention, and the value that industry is promoted the use of is very big.Main special-effect of the present invention shows:
1. the density of high density fracturing liquid of the present invention is higher than all of the fracturing fluid density at present.The density of high density fracturing liquid is 1.05～1.6g/cm
3
2. high density fracturing liquid of the present invention can be realized the fracturing liquid adjustable density by regulating weighting agent combination and ratio, adapts to on-the-spot desired density requirement.
3. the high density fracturing liquid system of the present invention's proposition has good comprehensive performances:
(1) density of high density fracturing liquid: 1.05～1.60g/cm
3
(2) have the excellent compatibility energy, good compatibleness is arranged with other additive and resident fluid;
(3) has the delay cross linking characteristic, crosslinking time 3～10min;
(4) have the anti-cutting performance of good heatproof, 150 ℃ of temperature resistant capabilities, viscosity is greater than 100mPa.S;
(5) have good filtration reduction energy,, leakoff coefficent is
(6) compare with other aqueous fracturing fluids, high density fracturing liquid is low to the injury rate on stratum, and the highest only have 31%;
(7) have good anti-swollen effect, do not adding under the situation of any expansion-resisting agent, anti-swollen rate can reach 70%.
Subject range of the present invention is the fracturing reform of high-pressure oil gas reservoir.There is more deep-well in the western oil-gas field of China, high temperature, high pressure reservoir, and conventional fracturing liquid can not satisfy the needs of surpressure reservoir reconstruction.Adopt heavy cracking-fluid formula system of the present invention, not only fracturing liquid density can be regulated according to the construction density requirements, and fracturing liquid has characteristics such as good delay cross linking, heatproof, anti-shearing, low leak-off, end injury.High density fracturing liquid can reduce wellhead pressure, to the frac job of high pressure, ultra deep well, can reduce operation pressure, reduces the load of pressure break pump truck, guarantees that the pressing crack construction safety etc. of strong well is significant.Therefore, be with a wide range of applications in the present invention's surpressure oil-gas field transformation at home and abroad.
Below in conjunction with specific embodiment the present invention is described in further detail.
Embodiment
Embodiment 1: the weighting agent sodium-chlor of adding 26%, the density of forming high density fracturing liquid is 1.2g/cm
3
Prescription: weighting agent adopts sodium-chlor, 26%;
The vegetable jelly viscosifying agent adopts hydroxypropylguar gum, 0.5%;
Crosslinked fluid adopts organic borate cross-linker, 0.3%;
Hydrocarbon chain and fluorine carbon table agent compound alive, 0.5% are adopted in the cleanup additive agent;
PH value conditioning agent 1 adopts yellow soda ash, 0.15%;
PH value conditioning agent 2 adopts sodium hydroxide, 0.04%;
Gel breaker adopts NBA-101 capsule breaker+ammonium persulphate, 0.02%;
Sterilant adopts formaldehyde, 0.05%;
Water, 72.44%.
Preparation method: press formula rate and add Agitation Tank, stirring at normal temperature.Adding sequencing is: water, sterilant, weighting agent, vegetable jelly viscosifying agent, cleanup additive, pH value conditioning agent, gel breaker, linking agent.Preparation process is finished by the operator under the technician instructs.
Embodiment 2: add two kinds of weighting agents, and 21% Sodium Bromide and 15% sodium-chlor, the density of the high density fracturing liquid of composition is 1.34g/cm
3
Prescription: weighting agent 1 adopts Sodium Bromide, 21%;
Weighting agent 2 adopts sodium-chlor, 15%;
The vegetable jelly viscosifying agent adopts hydroxypropylguar gum, 0.55%;
Crosslinked fluid adopts organic borate cross-linker, 0.35%;
PH value conditioning agent 1 adopts yellow soda ash, 0.15%;
PH value conditioning agent 2 adopts sodium hydroxide, 0.04%;
Gel breaker adopts NBA-101 capsule breaker+ammonium persulphate, 0.05%.
Cleanup additive adopts hydrocarbon chain and fluorine carbon table agent compound alive, 0.5%;
Sterilant adopts formaldehyde, 0.03%;
Water, 62.38%.
Compound method is identical with embodiment 1.
Embodiment 3: add two kinds of weighting agents, and 44% Sodium Bromide, 4% sodium-chlor, the high density fracturing liquid of composition, density is 1.51g/cm
3
Prescription: weighting agent 1 adopts Sodium Bromide, 44%;
Weighting agent 2 adopts sodium-chlor, 4%;
The vegetable jelly viscosifying agent adopts hydroxypropyl carboxy methyl guar gum, 0.45%;
Crosslinked fluid adopts organic borate cross-linker, 0.35%;
PH value conditioning agent 1 adopts yellow soda ash, 0.15%;
PH value conditioning agent 2 adopts sodium hydroxide, 0.04%;
Gel breaker adopts NBA-101 capsule breaker+ammonium persulphate, 0.05%;
Cleanup additive adopts hydrocarbon chain and fluorine carbon table agent compound alive, 0.5%;
Sterilant adopts formaldehyde, 0.04%;
Water, 50.42%.
Compound method is identical with embodiment 1.
Embodiment 4:
The weighting agent Potassium Bromide of adding 38%, the density of forming high density fracturing liquid is 1.25g/cm
3
Prescription: weighting agent adopts Repone K, 38%;
The vegetable jelly viscosifying agent adopts carboxymethyl guar glue, 0.5%;
Crosslinked fluid adopts organic borate cross-linker, 0.4%;
Hydrocarbon chain and fluorine carbon table agent compound alive, 0.5% are adopted in the cleanup additive agent;
PH value conditioning agent 1 adopts yellow soda ash, 0.15%;
PH value conditioning agent 2 adopts sodium hydroxide 0.04%;
Gel breaker adopts NBA-101 capsule breaker+ammonium persulphate 0.02%;
Sterilant adopts formaldehyde, 0.035%;
Water 60.35%.
Compound method is identical with embodiment 1.
Claims (8)
1. a high density fracturing liquid is characterized in that by following each composition weight ratio, and is formulated,
Weighting agent 26～50%;
Vegetable jelly viscosifying agent 0.3～1.0%;
Linking agent 0.1～2.0%;
PH value conditioning agent 0.5～1.0%;
Gel breaker 0.002～0.3%;
Cleanup additive 0.05～0.5%;
Sterilant 0.03～0.2%;
Water 30～73%;
Each component content and be 100%.
2. high density fracturing liquid according to claim 1 is characterized in that weighting agent is Sodium Bromide, Potassium Bromide or sodium-chlor, adopts the composite mode of one or both materials to add.
3. high density fracturing liquid according to claim 1 and 2 is characterized in that the vegetable jelly viscosifying agent is guar gum, hydroxypropylguar gum, carboxymethyl guar glue, hydroxypropyl carboxy methyl guar gum, fenugreek gum or sesbania gum, and weight ratio is 0.4～0.7%.
4. high density fracturing liquid according to claim 1 and 2 is characterized in that linking agent is borate, organic boron zirconates or organic zirconium, and weight ratio is 0.2～0.5%.
5. high density fracturing liquid according to claim 1 and 2, its feature is yellow soda ash, sodium bicarbonate or sodium hydroxide in pH value conditioning agent.
6. high density fracturing liquid according to claim 1 and 2, its feature is ammonium persulphate or Potassium Persulphate in gel breaker, weight ratio is 0.02～0.04%.
7. high density fracturing liquid according to claim 1 and 2 is characterized in that cleanup additive is methyl alcohol or ethanol.
8. high density fracturing liquid according to claim 2 is characterized in that weighting agent is made up of 44% Sodium Bromide that accounts for the fracturing liquid gross weight and 4% sodium-chlor, and the density that forms high density fracturing liquid is 1.51g/cm
3
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101538369B (en) * | 2009-04-24 | 2011-06-01 | 西安荣翔精细化工有限责任公司 | Preparation method of hydroxypropyl guar gel emulsifiable solution |
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| CN101476452B (en) * | 2009-01-16 | 2012-05-09 | 庆阳长庆井下油田助剂有限责任公司 | Water-control fracturing yield increasing method for oil gas well |
| CN101633840B (en) * | 2009-07-08 | 2013-02-13 | 中国石油天然气股份有限公司 | Hydrophobic group graft modified guar gum fracturing fluid gel |
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