CN103131402B - High temperature resistance solid free low damage well killing fluid and preparation method thereof - Google Patents
High temperature resistance solid free low damage well killing fluid and preparation method thereof Download PDFInfo
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- CN103131402B CN103131402B CN201210210764.4A CN201210210764A CN103131402B CN 103131402 B CN103131402 B CN 103131402B CN 201210210764 A CN201210210764 A CN 201210210764A CN 103131402 B CN103131402 B CN 103131402B
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- 239000012530 fluid Substances 0.000 title claims abstract description 80
- 230000006378 damage Effects 0.000 title claims abstract description 29
- 239000007787 solid Substances 0.000 title claims abstract description 29
- 230000002147 killing effect Effects 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 26
- 150000003839 salts Chemical class 0.000 claims abstract description 21
- 229920000642 polymer Polymers 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000003077 lignite Substances 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 229920003086 cellulose ether Polymers 0.000 claims abstract description 11
- 230000005764 inhibitory process Effects 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims description 9
- 150000002170 ethers Chemical class 0.000 claims description 9
- 230000004048 modification Effects 0.000 claims description 9
- 238000012986 modification Methods 0.000 claims description 9
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 claims description 8
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 8
- 239000004215 Carbon black (E152) Substances 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 8
- 230000001070 adhesive effect Effects 0.000 claims description 8
- 229930195733 hydrocarbon Natural products 0.000 claims description 8
- 229940047670 sodium acrylate Drugs 0.000 claims description 8
- 239000001509 sodium citrate Substances 0.000 claims description 8
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical compound [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 claims description 8
- -1 sulphur methyl potassium Chemical compound 0.000 claims description 8
- HRXKRNGNAMMEHJ-UHFFFAOYSA-K trisodium citrate Chemical compound [Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O HRXKRNGNAMMEHJ-UHFFFAOYSA-K 0.000 claims description 8
- 229940038773 trisodium citrate Drugs 0.000 claims description 8
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- 238000004220 aggregation Methods 0.000 claims description 7
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- 230000008569 process Effects 0.000 claims description 7
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- 125000001183 hydrocarbyl group Chemical group 0.000 claims description 5
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical group [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 claims description 5
- ATZQZZAXOPPAAQ-UHFFFAOYSA-M caesium formate Chemical group [Cs+].[O-]C=O ATZQZZAXOPPAAQ-UHFFFAOYSA-M 0.000 claims description 4
- WFIZEGIEIOHZCP-UHFFFAOYSA-M potassium formate Chemical group [K+].[O-]C=O WFIZEGIEIOHZCP-UHFFFAOYSA-M 0.000 claims description 4
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 14
- 238000005260 corrosion Methods 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 8
- 238000011161 development Methods 0.000 abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 4
- 230000000116 mitigating effect Effects 0.000 abstract description 4
- 239000012065 filter cake Substances 0.000 abstract description 2
- 239000003345 natural gas Substances 0.000 abstract description 2
- 239000003209 petroleum derivative Substances 0.000 abstract description 2
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- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
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- 150000001875 compounds Chemical class 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
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- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
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- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 241000370738 Chlorion Species 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- XQCFHQBGMWUEMY-ZPUQHVIOSA-N Nitrovin Chemical compound C=1C=C([N+]([O-])=O)OC=1\C=C\C(=NNC(=N)N)\C=C\C1=CC=C([N+]([O-])=O)O1 XQCFHQBGMWUEMY-ZPUQHVIOSA-N 0.000 description 1
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- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to high temperature resistance solid free low damage well killing fluid and a preparation method of the high temperature resistance solid free low damage well killing fluid, and belongs to the field of petroleum and natural gas exploration and development. The high temperature resistance solid free low damage well killing fluid is composed of the following components: multifunctional polymers, modified brown coal, water-soluble cellulose ethers derivative, high temperature corrosion mitigation stabilizer, organic salt weighting agent, and water. Quality percentage composition of the components is as follows: 0.3%-2% of the multifunctional polymers, 0.5%-5% of the modified brown coal, 0.3%-2% of the water-soluble cellulose ethers derivative, 0.01%-0.3% of the high temperature corrosion mitigation stabilizer, and dosage of the organic salt weighting agent is controlled to ensure that density of the high temperature resistance solid free low damage well killing fluid achieves 1.0 gram / cubic centimeter-2.3 grams / cubic centimeter, and the balance is the water. The high temperature resistance solid free low damage well killing fluid is low in filter loss, thin in filter cakes, and capable of protecting stratum environment from being polluted and damaged, ensuring viscosity of the high temperature resistance solid free low damage well killing fluid to reserve more than half under long-term high temperature stratum shear, and having the effect of swelling prevention and corrosion mitigation.
Description
Technical field
The present invention relates to a kind of well control fluid for using in Oil/gas Well operation process during petroleum and natural gas exploratory development, particularly a kind of high temperature resistance Solid Free low damage well control fluids for using in strong retraction hydrocarbon-bearing pool operation process.
Background technology
Along with deepening continuously of oil-field development, stratigraphic-type reservoir character is more complicated, and all Oilfield Company require also higher to the protection of hydrocarbon zone.Along with the transformation (as Large travel range, horizontal well, Multilateral Wells etc.) of development mode constantly occurs, environment protection is stricter.The intensification of Oil/gas Well, formation temperature, pressure are all along with rising, and well control fluid is faced with the difficult point of high temperature, high pressure, require that well control fluid has satisfactory stability and rheological under ultra high temp and super-high density.For meeting these requirements, ensureing the Efficient Development of oil-gas field, meeting the protection requirement of hydrocarbon zone, when reservoir pressure coefficient is greater than 1.0, the high temperature resistance environmental protection well control fluid of rational density must be used in various operation process.
The well control fluid of the excellent property of current use mostly is material that resene not easily degrades and forms and be unfavorable for environmental protection, and the well control fluid of common inorganic salt exists the large problem of filter loss.Although the low temperature Solid Free low damage well control fluids system excellent property of current application, is beneficial to environmental protection, be not suitable for operation under hot conditions.Hydrocarbon-bearing pool for strong retraction hydrocarbon-bearing pool and complicated character does not also have suitable high temperature resistance Solid Free low damage well control fluids system.
It is moderate that the key of exploitation high temperature resistance Solid Free low damage well control fluids system is to choose molecular weight, has salt solution thickening, falls filter, multiple copolymer that anti-swollen, anti-divalent ion pollutes, easily degrades.There is the problems such as performance is single, weak to salt solution thickening capabilities, dosage is large in the polymkeric substance that current well control fluid uses.
High temperature deep well quantity increases gradually in recent years, use the corrosion prevention problem must considering Oil/gas Well tubing string during well control fluid, therefore Killing Fluid System can not introduce chlorion and calcium ion, and these two kinds of ions can cause the erosion and encrustation of tubing string, directly affect the production of Oil/gas Well.Therefore need to study that a set of use raw material sources is wide, preparation is convenient, use organic salt as the Killing Fluid System of weighting agent.
Summary of the invention
The object of this invention is to provide a kind of high temperature resistance Solid Free low damage well control fluids to be applicable in strong retraction gas reservoir operation process.
For achieving the above object, high temperature resistance Solid Free low damage well control fluids of the present invention, consists of the following composition: multifunctional polymer, modification brown coal, water-soluble cellulose ether analog derivative, high temperature inhibition stablizer, organic salt weighting agent, and surplus is water.
Wherein, each component mass percentage is:
Multifunctional polymer is 0.3% ~ 2%,
Modification brown coal are 0.5% ~ 5%,
Water-soluble cellulose ether analog derivative is 0.3% ~ 2%,
High temperature inhibition stablizer is 0.01% ~ 0.3%,
The consumption of organic salt weighting agent controls to reach 1.0g/cm at the described well killing fluid density of guarantee
3~ 2.3g/cm
3,
Surplus is water.
Described multifunctional polymer is the quadripolymer of acrylamide, N,N-DMAA, 2-acrylamide-2-methylpro panesulfonic acid, sodium acrylate.
Further, acrylamide in described quadripolymer: N,N-DMAA: 2-acrylamide-2-methylpro panesulfonic acid: the mol ratio of sodium acrylate is 2 ~ 70: 1 ~ 10: 8 ~ 72: 17 ~ 25, the molecular weight of described quadripolymer is 1,000,000 ~ 2,000,000.
Described modification brown coal are sulphur methyl potassium humate or sodium humate sulfomethylation.
Described water-soluble cellulose ether analog derivative is low adhesive aggregation anionic cellulose.
Described high temperature inhibition stablizer is nitrilotriacetic acid (be called for short NTA) is the mixture of 1: 1: 0.1 ~ 0.5 with Sodium orthomolybdate, Trisodium Citrate ratio, preferably 1: 1: 0.2.
It is 1.00 ~ 1.30g/cm that described well killing fluid density requires
3time, organic salt weighting agent is sodium formiate;
It is 1.31 ~ 1.60g/cm that described well killing fluid density requires
3time, organic salt weighting agent is potassium formiate;
It is 1.61 ~ 2.30g/cm that described well killing fluid density requires
3time, organic salt weighting agent is cesium formate.
Wherein, the mass percentage of organic salt weighting agent is 17% ~ 85%.
In well control fluid of the present invention, the mechanism of action of each composition is as follows:
(1) multifunctional polymer, as well control fluid thickening, falls filter, anti-swollen.Wherein acrylamide: N,N-DMAA: 2-acrylamide-2-methylpro panesulfonic acid: sodium acrylate has higher apparent viscosity and good Efficient Adhesive Promotion by the quadripolymer that certain mol proportion synthesizes, and heat-resistant salt-resistant better performances.
Working mechanism: the main chain of polymer molecule and main chain and hydrophilic radical connecting key must have C-C, the keys such as C-N, C-S.Increase the hydrophilic radical on polymer molecule, overcome high temperature dehydration turn into and substituting group to come off the deficiency of the molecular hydrophylic caused, increase the hydrophilic ability of polymer molecule, the high temperature resistant property of raising organic agent.By introducing the functional group 2-acrylamide-2-methylpro panesulfonic acid of salt tolerant, introducing the structural unit N,N-DMAA of hydrolysis, improving salt tolerant resistance to elevated temperatures.
(2) modification brown coal, as well control fluid fluid loss agent, wherein sulphur methyl potassium humate is generated by sulfonation reaction and other chemical modification in brown coal by humic acids, good filtration-control additive and thinner, the clay dispersion of (200 ~ 230 DEG C) under can effectively suppressing hot conditions, improve high-temperature stability and reduce filter loss, and having good compatibility with other treatment agent, being particularly useful for the stabilization of water sensitivity rock stratum.Sulfonated-methyl brown coal raw material is easy to get, low price, has stronger thermostability.
Working mechanism: have stronger hydrophilic group sulphur methyl in sulphur methyl potassium humate molecule, high temperature dehydration can be overcome and turn use into, guarantee its high-temperature water-soluble.In treatment agent, hydrophilic radical is more, and its heat and salinity tolerance ability is stronger.Its molecular chain is macromole stiff chain, increases the viscosity of cement grout, increases the resistance of liquid phase to stratum leak-off.
(3) water-soluble cellulose ether analog derivative, as well control fluid fluid loss agent auxiliary agent.Wherein low adhesive aggregation anionic cellulose, by force water-soluble, has excellent anti-salt, anticalcium magnesium filtrate reducing ability and heat-resistant stability, and germ resistance is strong, and nontoxic, harmless, pollution-free, with environmental friendliness.The fluid of this product configuration has good filtrate-loss control, inhibition, higher temperature tolerance.
(4) organic salt weighting agent, as well killing fluid density conditioning agent, regulates dosage according to density requirements.
Wherein, density requirements is 1.00 ~ 1.30g/cm
3well control fluid, adopt sodium formiate obtain solution.Density requirements is 1.31 ~ 1.60g/cm
3solution time, adopt potassium formiate to regulate the density of required well control fluid.Density requirements is 1.61 ~ 2.30g/cm
3solution time, adopt cesium formate regulate the concrete ratio of the density of required well control fluid as shown in the table.
Table 1 formate system adds scale
The mass percentage being obtained organic salt weighting agent used by table is 17% ~ 85%.
Formate has strong rejection capability, effectively can suppress hydration swelling and the dispersion of mud shale, is conducive to reducing well control fluid to the infringement of hydrocarbon zone.Readily biodegradable, can not to environment.Little to the corrodibility of the metallic substance such as sleeve pipe, be conducive to the work-ing life extending them.Do not need high-density weighting material just can prepare high density well control fluids, and be conducive to reservoir protec-tion.This Killing Fluid System has good high temperature resistance, resistant to pollution ability, and can reduce used all kinds for the treatment of agents hydrolysis under the high temperature conditions and the speed of oxidative degradation.Good water solubility, dissolves fast, not containing divalent ion, compatibility and thermal stability better.Due to not containing solid phase, decrease the injury of solid matter to payzone, reservoir protec-tion to a greater degree.
After working mechanism: a, formate dissolves, ionize out inorganic monovalent positively charged ion, improve well control fluid liquid phase salinity, prevent or reduce infiltration aquation, under the dual function of inlaying with electrostatic attraction of inorganic cation, decrease entering of water molecules, thus play anti-collapse and restraining effect; B, formate reduce free water activity in mud, local water is permeated to well repercussion, promote wellbore stability, formate is polarity aquation group, small volume, and it is adsorbed in surface of clay by hydrogen bond force, increase hydration shell thickness, prevent the further aquation of clay, form structure, make well control fluid keep good rheological and stability.
(5) high temperature inhibition stablizer has corrosion inhibition, and NTA and Sodium orthomolybdate, Trisodium Citrate have synergistic slow corrosion effect, have very strong resistance to elevated temperatures.Each component uses according to proportioning of the present invention, can reach minimum erosion rate.
The mixture mechanism of action: synergistic slow corrosion effect can be formed in metallic surface has complementary protective membrane, improves corrosion potential, reduces corrosion current, improve comprehensive benefit.Available a small amount of inhibition material obtains good effect.It is nontoxic, pollution-free but expensive that molybdate is used as inhibiter, consumption is large and be restricted, therefore the inhibiter based on molybdate is used widely, corrosion mitigating effect is good, especially sharing with other medicament can the generation of inhibiting point corrosion greatly, thermostability is high, can be used for high hot high-density systems.
The preparation method of described high temperature resistance Solid Free low damage well control fluids, comprise and modification brown coal are added to the water, stir and be mixed with well control fluid preparation liquid, add organic salt weighting agent, multifunctional polymer, water-soluble cellulose ether analog derivative, high temperature inhibition stablizer successively, after stirring, namely obtain high temperature resistance Solid Free low damage well control fluids.
Described high temperature resistance Solid Free low damage well control fluids can be used in strong retraction hydrocarbon-bearing pool operation process.
The performance of well control fluid of the present invention is as follows:
Table 2 well control fluid performance index
Well control fluid of the present invention has following beneficial effect:
(1) well control fluid filter loss is low and filter cake is thin, and protection ground environment is not contaminated and destroy, and has corrosion inhibition;
(2) the long-time high-temperature stratum of well control fluid viscosity ensures under shearing that viscosity reservation is over half, and has antiexpanding action;
(3) well killing fluid density regulates according to requirements, and regulation range can from 1.0g/cm
3~ 2.3g/cm
3;
(4) well control fluid is raw materials used is readily biodegradable and is sell goods disclosed in market, and source is wide, and preparation is convenient;
(5) well control fluid heat-resisting property is good, and thermostability is strong, and most high energy resists 180 DEG C, 24h viscosity conservation rate more than 50%;
(6) the raw materials used main component of well control fluid is monomer, and formula is simple, and be easy to safeguard process and extemporaneous preparation, comparatively like product ratio, reduces overall cost, reduces the labour intensity of workman;
(7) each components compatibility performance of well control fluid is good, and chemical reaction does not occur, static more than 48h does not have demixing phenomenon.And the composite use of each component has synergistic function, therefore consumption is few compared with like product, and result of use is good.
Embodiment
Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Agents useful for same of the present invention is all commercially available.
Embodiment 1 is with 1m
3, proportion is 1.3g/cm
3for example, prepare by kill-job liquid formula.
Formula:
Sulphur methyl potassium humate 15kg;
Sodium formiate 557.7kg;
Molecular weight is quaternary multifunctional polymer (acrylamide: N,N-DMAA: 2-acrylamide-2-methylpro panesulfonic acid: the mol ratio of sodium acrylate is 65: 10: 9: the 17.5) 8kg of 1,000,000;
Low adhesive aggregation anionic cellulose (purchased from jewel Chemical Co., Ltd.) 20kg;
NTA and Sodium orthomolybdate, Trisodium Citrate ratio are the mixture 1.2kg of 1: 1: 0.2;
Water 698.1kg.
Compound method:
(1) injected clear water 698.1kg in dosing pond, prepares dosing under the condition of 1000 revs/min;
(2) under whipped state, add sulphur methyl potassium humate 15kg, stir, obtain well control fluid and prepare liquid;
(3) continue to add sodium formiate 557.7kg under whipped state, stir;
(4) continue under whipped state, add the quaternary multifunctional polymer 8kg that molecular weight is 1,000,000, stir;
(5) continue under whipped state, add low adhesive aggregation anionic cellulose 20kg, stir;
(6) continue under whipped state, add the mixture 1.2kg that NTA and Sodium orthomolybdate, Trisodium Citrate ratio are 1: 1: 0.2, after stirring, namely obtain the high temperature resistance Solid Free low damage well control fluids being suitable for strong retraction.
Well control fluid performance index detect: as above shown in table 2.
Well control fluid performance index detection method:
(1) density measurement
The 4.1-4.4 that density measurement is pressed in GB/16783.1-2006 performs, and measuring temperature is 30 DEG C.
(2) apparent viscosity
After product configuration completes in 48 hours, measure normal temperature
reading, then puts into high-temperature tank heat at 180 DEG C and rolls 24h, takes out and is cooled to that room temperature is high again stirs 5 minutes, measure heat roll after
reading.
(3) static suspension steady time
Static suspension to be pressed 5.6 in SY/T5834-2007 steady time and is performed.
(4) fluid loss measures
API fluid loss measures 7.2 execution of pressing in GB/16783.1-2006.
High Temperature High Pressure fluid loss measures 7.3 execution of pressing in GB/16783.1-2006.
(5) tube corrosion rate measures
Tube corrosion rate measures presses SY/T0026-1999 execution.
(6) shale anti-dilative
A. laboratory apparatus: High Temperature High Pressure rock core expansion-pressure testing apparatus
B. experimental technique:
1. take 20g at bentonite in powder, make simulation core with the exert pressure 5min of 4MPa.
2. the test cup that simulation core is housed is put into test cabinet, after displacement sensor head aligning test cup is put well, the plug of lid test cabinet.
3. load distilled water at test macro I, test macro II loads Zhongbo Company well control fluid, opens computer testing software, temperature is set in 150 DEG C, and pressure setting records swell increment in 24h and anti-dilative under 10MPa condition.
Result is as shown in table 3.
Table 3 well control fluid performance index detected result
Embodiment 2 is with 1m
3, proportion is 1.6g/cm
3for example, prepare by kill-job liquid formula.
Formula:
Sulphur methyl potassium humate 48kg;
Potassium formiate 1232kg;
Molecular weight is quaternary multifunctional polymer (acrylamide: N,N-DMAA: 2-acrylamide-2-methylpro panesulfonic acid: the mol ratio of sodium acrylate is 4: 3: 70: the 25) 16kg of 2,000,000;
Low adhesive aggregation anionic cellulose (purchased from jewel Chemical Co., Ltd.) 24kg;
NTA and Sodium orthomolybdate, Trisodium Citrate ratio are the mixture 2.4kg of 1: 1: 0.5;
Water 277.6kg.
Compound method, Testing index and detection method are as embodiment 1.Detected result is as shown in table 4, all meets the requirements.
Table 4 well control fluid performance index detected result
Embodiment 3 is with 1m
3, proportion is 2.1g/cm
3for example, prepare by kill-job liquid formula.
Formula:
Sulphur methyl potassium humate 16.8kg;
Cesium formate 1604.4kg;
Molecular weight is 1,000,000 quaternary multifunctional polymers (acrylamide: N,N-DMAA: 2-acrylamide-2-methylpro panesulfonic acid: the mol ratio of sodium acrylate is 67: 5: 10: 20.5) 10.5kg;
Low adhesive aggregation anionic cellulose (purchased from jewel Chemical Co., Ltd.) 20kg;
NTA and Sodium orthomolybdate, Trisodium Citrate ratio are the mixture 1.2kg of 1: 1: 0.2;
Water 447.1kg.
Compound method, Testing index and detection method are as embodiment 1.Detected result is as shown in table 5, all meets the requirements.
Table 5 well control fluid performance index detected result
Experimental example take proportion as 2.1g/cm
3for example, contrast the performance index of high temperature resistance Solid Free low damage well control fluids of the present invention and like product (purchased from Weifang Bei Cheng Chemical Co., Ltd.).Detected result is as shown in table 6.
Table 6 well control fluid performance index detected result
Can be drawn by Data Comparison in table, the high temperature Solid Free low damage well control fluids property indices of this patent is equal to or is better than like product.One, after 180 DEG C of heat roll 24h, this patent product viscosity rate of loss is 27.8%, is less than 50%; And like product viscosity loss velocity is 65%, higher than 50%, this patent product effect is more excellent.After its two, 180 DEG C of heat roll 24h, this patent product High Temperature High Pressure fluid loss is 17ml, and like product High Temperature High Pressure fluid loss is 28ml, and this patent product effect is more excellent.Meanwhile, tube corrosion speed and anti-dilative are also all that this patent product effect is more excellent.
Claims (7)
1. a high temperature resistance Solid Free low damage well control fluids, is characterized in that, consists of the following composition: multifunctional polymer, modification brown coal, water-soluble cellulose ether analog derivative, high temperature inhibition stablizer, organic salt weighting agent, water; Wherein, each component mass percentage is:
Multifunctional polymer is 0.3% ~ 2%,
Modification brown coal are 0.5% ~ 5%,
Water-soluble cellulose ether analog derivative is 0.3% ~ 2%,
High temperature inhibition stablizer is 0.01% ~ 0.3%,
The consumption of organic salt weighting agent controls to reach 1.0g/cm at the described well killing fluid density of guarantee
3~ 2.3g/cm
3,
Surplus is water;
Described multifunctional polymer is the quadripolymer of acrylamide, N,N-DMAA, 2-acrylamide-2-methylpro panesulfonic acid, sodium acrylate;
Acrylamide in described quadripolymer: N,N-DMAA: 2-acrylamide-2-methylpro panesulfonic acid: the mol ratio of sodium acrylate is 2 ~ 70:1 ~ 10:8 ~ 72:17 ~ 25;
The molecular weight of described quadripolymer is 1,000,000 ~ 2,000,000;
Described high temperature inhibition stablizer is the mixture that nitrilotriacetic acid is 1:1:0.1 ~ 0.5 with Sodium orthomolybdate, Trisodium Citrate ratio.
2. high temperature resistance Solid Free low damage well control fluids according to claim 1, is characterized in that, described modification brown coal are sulphur methyl potassium humate or sodium humate sulfomethylation.
3. high temperature resistance Solid Free low damage well control fluids according to claim 1, is characterized in that, described water-soluble cellulose ether analog derivative is low adhesive aggregation anionic cellulose.
4. high temperature resistance Solid Free low damage well control fluids according to claim 1, is characterized in that, described high temperature inhibition stablizer is the mixture that nitrilotriacetic acid is 1:1:0.2 with Sodium orthomolybdate, Trisodium Citrate ratio.
5. high temperature resistance Solid Free low damage well control fluids according to claim 1, is characterized in that, it is 1.00 ~ 1.30g/cm that well killing fluid density requires
3time, organic salt weighting agent is sodium formiate;
It is 1.31 ~ 1.60g/cm that well killing fluid density requires
3time, organic salt weighting agent is potassium formiate;
It is 1.61 ~ 2.30g/cm that well killing fluid density requires
3time, organic salt weighting agent is cesium formate.
6. the preparation method of the high temperature resistance Solid Free low damage well control fluids described in any one of Claims 1 to 5, comprise the following steps: modification brown coal are added to the water, stir and be mixed with well control fluid preparation liquid, add organic salt weighting agent, multifunctional polymer, water-soluble cellulose ether analog derivative, high temperature inhibition stablizer successively, after stirring, namely obtain high temperature resistance Solid Free low damage well control fluids.
7. the application of the high temperature resistance Solid Free low damage well control fluids described in any one of Claims 1 to 5 in High Temperature High Pressure strong retraction hydrocarbon-bearing pool operation process.
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| CN103992779B (en) * | 2014-05-23 | 2015-06-10 | 北京培康佳业技术发展有限公司 | Water-soluble organic salt weighting agent for drilling fluid for oilfields as well as preparation method and application thereof |
| CN103992778B (en) * | 2014-05-23 | 2015-06-10 | 北京培康佳业技术发展有限公司 | Water-soluble organic salt weighting agent for drilling fluid for oilfields as well as preparation method and application thereof |
| CN103992777B (en) * | 2014-05-23 | 2015-06-10 | 北京培康佳业技术发展有限公司 | Water-soluble organic salt weighting agent for drilling fluid for oilfields as well as preparation method and application thereof |
| CN104449604A (en) * | 2014-06-26 | 2015-03-25 | 武志学 | Solid-free well control fluid for borehole operation for low permeability reservoir and preparation method of solid-free well control fluid |
| CN104232033B (en) * | 2014-09-15 | 2017-05-10 | 北京博达石科科技开发有限公司 | Multifunctional type high-temperature-resistant composite well control fluid and preparation method and applications thereof |
| CN104559965A (en) * | 2014-12-22 | 2015-04-29 | 陈国伟 | High-density emergent well killing fluid for deep gas well and preparation method of high-density emergent well killing fluid |
| CN108384521B (en) * | 2018-04-26 | 2020-04-21 | 中国石油天然气股份有限公司 | Is suitable for CO2Gas-invasion-resistant high-density well killing fluid for driving ultra-low permeability reservoir |
| CN113308230A (en) * | 2021-06-15 | 2021-08-27 | 克拉玛依市红都有限责任公司 | Temporary plugging type low-free hydraulic well fluid and preparation method thereof |
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