CN103045189B - Low-permeability solid-free completion fluid - Google Patents
Low-permeability solid-free completion fluid Download PDFInfo
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- CN103045189B CN103045189B CN201210577357.7A CN201210577357A CN103045189B CN 103045189 B CN103045189 B CN 103045189B CN 201210577357 A CN201210577357 A CN 201210577357A CN 103045189 B CN103045189 B CN 103045189B
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- 239000012530 fluid Substances 0.000 title claims abstract description 41
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 24
- 230000007797 corrosion Effects 0.000 claims abstract description 17
- 238000005260 corrosion Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims abstract description 12
- UAYWVJHJZHQCIE-UHFFFAOYSA-L zinc iodide Chemical compound I[Zn]I UAYWVJHJZHQCIE-UHFFFAOYSA-L 0.000 claims abstract description 12
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 claims abstract description 10
- 239000003112 inhibitor Substances 0.000 claims abstract description 10
- VNDYJBBGRKZCSX-UHFFFAOYSA-L zinc bromide Chemical compound Br[Zn]Br VNDYJBBGRKZCSX-UHFFFAOYSA-L 0.000 claims abstract description 10
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 claims abstract description 10
- NJSSICCENMLTKO-HRCBOCMUSA-N [(1r,2s,4r,5r)-3-hydroxy-4-(4-methylphenyl)sulfonyloxy-6,8-dioxabicyclo[3.2.1]octan-2-yl] 4-methylbenzenesulfonate Chemical group C1=CC(C)=CC=C1S(=O)(=O)O[C@H]1C(O)[C@@H](OS(=O)(=O)C=2C=CC(C)=CC=2)[C@@H]2OC[C@H]1O2 NJSSICCENMLTKO-HRCBOCMUSA-N 0.000 claims abstract description 9
- 238000002425 crystallisation Methods 0.000 claims abstract description 9
- 230000008025 crystallization Effects 0.000 claims abstract description 9
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 claims abstract description 8
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000011684 sodium molybdate Substances 0.000 claims abstract description 6
- 235000015393 sodium molybdate Nutrition 0.000 claims abstract description 6
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical compound [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000011592 zinc chloride Substances 0.000 claims abstract description 6
- 235000005074 zinc chloride Nutrition 0.000 claims abstract description 6
- ZOIORXHNWRGPMV-UHFFFAOYSA-N acetic acid;zinc Chemical compound [Zn].CC(O)=O.CC(O)=O ZOIORXHNWRGPMV-UHFFFAOYSA-N 0.000 claims abstract description 5
- PXLIDIMHPNPGMH-UHFFFAOYSA-N sodium chromate Chemical compound [Na+].[Na+].[O-][Cr]([O-])(=O)=O PXLIDIMHPNPGMH-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000004246 zinc acetate Substances 0.000 claims abstract description 5
- 229940102001 zinc bromide Drugs 0.000 claims abstract description 5
- GTQFPPIXGLYKCZ-UHFFFAOYSA-L zinc chlorate Chemical compound [Zn+2].[O-]Cl(=O)=O.[O-]Cl(=O)=O GTQFPPIXGLYKCZ-UHFFFAOYSA-L 0.000 claims abstract description 5
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims abstract description 5
- 229960001763 zinc sulfate Drugs 0.000 claims abstract description 5
- 229910000368 zinc sulfate Inorganic materials 0.000 claims abstract description 5
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229920000881 Modified starch Polymers 0.000 claims abstract description 3
- 239000004368 Modified starch Substances 0.000 claims abstract description 3
- 235000019426 modified starch Nutrition 0.000 claims abstract description 3
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 6
- 230000003750 conditioning effect Effects 0.000 claims description 5
- 239000004927 clay Substances 0.000 abstract description 18
- 230000035699 permeability Effects 0.000 abstract description 9
- 230000002579 anti-swelling effect Effects 0.000 abstract 2
- 229960001484 edetic acid Drugs 0.000 abstract 2
- 230000005484 gravity Effects 0.000 abstract 2
- BXNHTSHTPBPRFX-UHFFFAOYSA-M potassium nitrite Chemical group [K+].[O-]N=O BXNHTSHTPBPRFX-UHFFFAOYSA-M 0.000 abstract 1
- 239000002244 precipitate Substances 0.000 abstract 1
- 230000008961 swelling Effects 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 13
- 239000011435 rock Substances 0.000 description 10
- 238000006073 displacement reaction Methods 0.000 description 9
- 239000003129 oil well Substances 0.000 description 8
- 229920002472 Starch Polymers 0.000 description 7
- 239000003350 kerosene Substances 0.000 description 7
- 235000019698 starch Nutrition 0.000 description 7
- 239000008107 starch Substances 0.000 description 7
- 230000006378 damage Effects 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- 238000005553 drilling Methods 0.000 description 4
- 239000000706 filtrate Substances 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- 239000007790 solid phase Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 150000002605 large molecules Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 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
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002421 anti-septic effect Effects 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229940092782 bentonite Drugs 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 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
- 239000012267 brine Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 229940080314 sodium bentonite Drugs 0.000 description 1
- 229910000280 sodium bentonite Inorganic materials 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
A low-permeability solid-free completion fluid is characterized by comprising the following components in mass percentage: 20-65% of specific gravity regulator, 1-3% of fluid loss agent, 1-2% of antiswelling agent, 0.05-0.1% of crystallization inhibitor, 0.5-1% of anti-collapse agent, 0.5-1% of corrosion inhibitor and the balance of water, wherein the specific gravity regulator is one or a combination of more than two of zinc chloride, zinc bromide, zinc iodide, zinc sulfate, zinc acetate, zinc chlorate and zinc nitrate; the fluid loss agent is carboxymethyl modified starch; the antiswelling agent is diallyl dimethyl ammonium chloride; the crystallization inhibitor is one or a combination of two of nitrilotriacetic acid and EDTA (ethylene diamine tetraacetic acid); the anti-collapse agent is nitro potassium humate; and the corrosion inhibitor is one or a combination of more than two of sodium molybdate, sodium tungstate and sodium chromate. The low-permeability solid-free completion fluid is large in specific weight, good in stability and resistant to high temperature and high pressure, can reduce the swelling rate of clay, improves the core permeability restoring value and does not generate precipitates.
Description
Technical field
The present invention relates to a kind of completion fluid, particularly relate to a kind of Low-permeability solid-free completion fluid, for being applicable to the fluid composition of the wide density completion of Low Damage under completion phase high temperature, condition of high voltage.
Background technology
Well Completion Engineering of Oil Reservoirs is connected drilling engineering and petroleum production engineering and relatively independent engineering, is from oil reservoir left by brill, to setting of casing, cementing well, perforation, lower flow string, discharge opeing until a systematic engineering of business of operation.Oil well completion means that oil well will start to produce, and completion fluid is exactly the liquid contacted with oil-gas Layer all the time in Completion Operations.Completion fluid mainly contains following several effect: 1, control strata pressure and make hole stability, alleviate the pressure differential between ground and stratum, ensure job safety; 2, to suspend and solid phase in conveying well, provide suspension or cutting carring to the function on earth's surface, and remove useless solid phase from payzone band, prevent solid phase or drilling cuttings from blocking venturi; 3, prevent from filtrate from invading the interact fluid reaction blocked in oil reservoir or oil reservoir that causes clay swell, fine migration etc. to act on of oil reservoir and reservoir composition to produce to precipitate and block oil reservoir; 4, there is good antiseptic power, the corrosion to sleeve pipe and downhole tool can be slowed down; 5, ensure oil well long-term production, do not damage the entirety ecology of equipment in well and reservoir, guarantee oil well is complete and produce chronically, improves final oil well recovery ratio.
Completion fluid is a kind of fluid be mixed with various raw material and chemical addition agent, and formula system relatively more conventional at present mainly contains low solid phase completion fluid system and solid free completion fluid system.Its Main Ingredients and Appearance is inorganic salts and clay stabilizer.In existing completion fluid, inorganic salts composition has stronger corrosivity, huge to infringements such as underground equipment, pipeline, pump trucks; Be not suitable for high-temperature stratum; For the condition that strata pressure is higher, existing completion fluid cannot reach proportion requirement; The easy crystallization of inorganic salts composition, easily brings blocking to stratum; Sectional interest, containing oxious component, brings harm to people and environment.The character such as density, Acidity of Aikalinity, leak-off, rheological characteristic, high-temperature stability are the keys ensureing completion fluid proper function.Secondly, containing a large amount of large molecule inorganic agent in formula, play a role simultaneously at it, also there occurs the absorption of large molecule in reservoir, delay and gathering, form blocking and not easily remove, causing the injury to reservoir.Damage owing to causing core permeability to the injury of reservoir and can reach more than 30 ~ 50%, oil well cannot reach design output.
summary of the invention:
In order to make up the above-mentioned deficiency of current completion fluid, the invention provides a kind of Low-permeability solid-free completion fluid, it is characterized in that filling a prescription by mass percentage and be: proportion conditioning agent 20 ~ 65%, fluid loss additive 1 ~ 3%, expansion-resisting agent 1 ~ 2%, crystallization inhibitor 0.05 ~ 0.1%, anti-sloughing agent 0.5 ~ 1% and corrosion inhibiter 0.5 ~ 1%, surplus is water; Wherein said proportion conditioning agent is the combination of one or two or more kinds in zinc chloride, zinc bromide, zinc iodide, zinc sulfate, zinc acetate, zinc chlorate and zinc nitrate, fluid loss additive is carboxymethyl modified starch, expansion-resisting agent is diallyldimethylammonium chloride, crystallization inhibitor is the combination of a kind of in nitrilotriacetic acid and EDTA or two kinds, anti-sloughing agent is nitro khm, and corrosion inhibiter is one or more the combination in sodium molybdate, sodium tungstate and sodium chromate.
After preparation, gained fluid density is 1.30 ~ 2.60kg/m
3.
The present invention has following beneficial effect: the mutual compatibility of various raw material is good, oil well completion liquid and stratum compatibility good; This completion fluid than great, good stability, high temperature resistant, high pressure, can reduce clay swell rate, improves core permeability recovery value, comprises underground water, well-flushing seawater or strong brine etc. mix and do not produce precipitation with underground fluid; Reach protection reservoir, decreasing pollution, minimizing to the goal of the invention of the corrosion of underground equipment, the stable high yield for oil well provides strong guarantee.
detailed description of the invention:
Below in conjunction with embodiment, the invention will be further described: this completion fluid comprises following component, following each component proportioning by mass percentage: proportion conditioning agent 20 ~ 65%, fluid loss additive 1 ~ 3%, expansion-resisting agent 1 ~ 2%, crystallization inhibitor 0.05 ~ 0.1%, anti-sloughing agent 0.5 ~ 1% and corrosion inhibiter 0.5 ~ 1%, surplus is water.
Above-mentioned crystallization inhibitor has complexing to metal ion, and then destroys the formation of nucleus, changes the dissolution equilibrium between inorganic salts and solution, reaches the object improving inorganic salts solubility; Adding of expansion-resisting agent can improve preventive effect of expansion, and relative expansion rate is less than less than 20%; Sodium molybdate, chromic acid are pungent, the adding and Zn of Zinc Tungstate corrosion inhibiter
2+synergy, significantly reduce corrosivity, corrosion can reduce more than 30 times; Modified carboxy methyl starch significantly can reduce filter loss as fluid loss additive; Require different according to drilling well, in this completion fluid, add zinc chloride, zinc bromide, zinc iodide, zinc sulfate, zinc acetate, zinc chlorate and zinc nitrate 20% ~ 65% be used for regulating density, density can at 1.30g/cm
3~ 2.60g/cm
3between adjustment.
Embodiment 1 zinc acetate 11%, zinc chloride 9%, modified carboxy methyl starch 3%, diallyldimethylammonium chloride 1.5%, nitrilotriacetic acid 0.05%, EDTA0.025%, nitro khm 0.75%, sodium tungstate 0.25% and sodium chromate 0.5%, surplus is water.
Embodiment 2 zinc nitrate 20%, zinc iodide 25%, modified carboxy methyl starch 2%, diallyldimethylammonium chloride 2%, EDTA0.1%, nitro khm 0.5% and sodium molybdate 1%, surplus is water.
Embodiment 3 zinc bromide 65%, modified carboxy methyl starch 1%, diallyldimethylammonium chloride 1%, nitrilotriacetic acid 0.05%, nitro khm 1% and sodium tungstate 0.5%, surplus is water.
Embodiment 4 zinc chlorate 17%, zinc iodide 39%, modified carboxy methyl starch 1%, diallyldimethylammonium chloride 1%, nitrilotriacetic acid 0.05%, nitro khm 1% and sodium tungstate 0.5%, surplus is water.
Embodiment 5 zinc sulfate 15%, zinc chloride 30%, modified carboxy methyl starch 1%, diallyldimethylammonium chloride 1%, nitrilotriacetic acid 0.05%, nitro khm 1% and sodium tungstate 0.5%, surplus is water.
Test in laboratory is carried out to the completion fluid obtained by above-described embodiment technical scheme, detection method and experiment condition as follows:
1, density: detect by 3.2.2 clause regulation in GB/T 4472-2011.
2, pH value: detect with accurate pH test paper, measure three times, average.
3, rock core infiltration recovery rate:
3.1 laboratory apparatus and material: a core flow test device: SM 1 type or like product; B vavuum pump; C kerosene; D filter; E miillpore filter: 0.2um aperture; F formation core; G drilling machine: towel 25 × L can be bored, 50mm rock core; H slicer; I Constant Temp. Oven: room temperature ~ 200 DEG C.
3.2 determination steps:
Drill through standard rock core: specification 25mm × L, 50mm, measure its actual diameter and length.The rock core cut is dried to constant weight at 120 DEG C ± 3 DEG C temperature.
By the saturated kerosene of dried rock sample vacuum pump, calculate its porosity simultaneously.
Rock core is put into core flow test device, selects convenient pressure kerosene forward displacement rock core, be greater than 20 ~ 50 times of pore volume to displacement volume, and pressure comparatively constant till, rear survey core permeability, is denoted as K
1.
With the kerosene in completion fluid sample reverse displacement rock core, 20 ~ 50 times of pore volume are greater than to displacement volume, and pressure is comparatively constant, use the completion fluid in kerosene forward displacement rock core afterwards again, 20 ~ 50 times of pore volume are greater than to displacement volume, and pressure is comparatively constant, surveys permeability now, be denoted as K
2.
3.3 calculate:
Rock core infiltration recovery rate calculates by formula (1).
K=(K
2／K
1)×100 ……………………………(1)
In formula: K-recovery of core permeability, %;
K
1-record core permeability with after the displacement of kerosene forward, μm
2;
K
2-with after completion fluid reverse displacement again with the core permeability that the displacement of kerosene forward records, μm
2.
4, corrosion rate: the mensuration of corrosion rate is undertaken by GB/T18175-2000 regulation.
5, filter loss: by the method measurement and calculation filter loss specified in SY/T 5241-91.
6, relative expansion rate:
6.1 laboratory apparatus and medicine: a graduated vessels: 50m1. tool plug measuring graduates; B balance: sensibility reciprocal is 0.01g; C clay: meet the one-level bentonite in SY/T 5060-1993 standard.
6.2 test procedures:
Take 4.0g and be accurate to 0.01g, at 120 DEG C ± 2 DEG C temperature, be dried to the clay of constant weight in advance, pour in clean dry tool plug measuring graduates, shake reality gently, read clay volume, be denoted as V
0.
40mL is poured in tool plug measuring graduates.Completion fluid, fully shakes up immediately, static, make clay under room temperature in completion fluid aquation 24h.Period sways 5 times, and the time is 0.5 h, 1 h, 2 h, 6h, 8h after adding completion fluid respectively.Read the bulking value of clay after leaving standstill 24h again, this value is denoted as V
1.
Do blank assay with running water, with running water aquation clay, after leaving standstill 24h, bulking value is denoted as V simultaneously
2.
6.3 computational methods:
Relative expansion rate is pressed formula (2) and is calculated.
ψ=[(V
1one V
0)/(V
2one V
0)] × 100 ... (2)
In formula: 1l, a relative expansion rate, %;
V
0-clay initial volume, mL;
V
1clay volume after 24h during-completion fluid aquation clay, mL;
V
2clay volume after 24h during-running water aquation clay, mL.
Under above-mentioned detection method and experiment condition, every experimental result data is as follows:
1, corrosion inhibition contrast test; In a static condition, adopt hanging slice method, the test data tested embodiment 1 ~ 5 gained completion fluid is in table 1.
Table 1
As can be seen from test data, adopt the completion fluid corrosion rate of sodium molybdate, sodium chromate, sodium tungstate corrosion inhibiter extremely low, corrosion rate is well below standard 0.1 g/m
2h.
2, clay-phase is to anti-dilative performance test; Testing clay used is standard sodium bentonite, and utilize embodiment 1 ~ 5 gained completion fluid to carry out anti-clayswelling performance test respectively, relative expansion rate is less, illustrates that completion fluid suppresses clay swell ability stronger.Test data is in table 2.
Table 2
As can be seen from test data, the present invention adopts diallyldimethylammonium chloride as preventing that the effect stablizing swollen dose is very good, contributes to stratum clay stabilization, effectively can control particle migration, reduces completion fluid filter vector.
3, filtrate reducing amount performance test; Embodiment 1 ~ 5 gained completion fluid is utilized to carry out the test data of filtrate reducing amount performance test respectively in table 3.
Table 3
As can be seen from test data, modified carboxy methyl starch filtrate loss controllability is good.
Embodiment 1 ~ 5 gained completion fluid is utilized to carry out the test data of pH value and recovery of core permeability experiment in table 4.
Table 4
Comprehensive the above results can obtain the comprehensive performance parameter of completion fluid of the present invention in table 5:
Table 5
Claims (1)
1. a Low-permeability solid-free completion fluid, is characterized in that, comprises proportion conditioning agent 20 ~ 65%, fluid loss additive 1 ~ 3%, expansion-resisting agent 1 ~ 2%, crystallization inhibitor 0.05 ~ 0.1%, anti-sloughing agent 0.5 ~ 1% and corrosion inhibiter 0.5 ~ 1%, and surplus is water; Wherein said proportion conditioning agent is the combination of one or two or more kinds in zinc chloride, zinc bromide, zinc iodide, zinc sulfate, zinc acetate, zinc chlorate and zinc nitrate, fluid loss additive is carboxymethyl modified starch, expansion-resisting agent is diallyldimethylammonium chloride, crystallization inhibitor is the combination of a kind of in nitrilotriacetic acid and EDTA or two kinds, anti-sloughing agent is nitro khm, and corrosion inhibiter is one or more the combination in sodium molybdate, sodium tungstate and sodium chromate.
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| CN201210577357.7A CN103045189B (en) | 2012-12-27 | 2012-12-27 | Low-permeability solid-free completion fluid |
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| CN103045189B true CN103045189B (en) | 2015-03-25 |
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Cited By (1)
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|---|---|---|---|---|
| CN105462569A (en) * | 2015-12-25 | 2016-04-06 | 成都西油华巍科技有限公司 | Salt recrystallization inhibitor for oil and gas well and preparation method of salt recrystallization inhibitor |
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| CN103497749B (en) * | 2013-09-25 | 2015-09-30 | 天津亿利科能源科技发展股份有限公司 | EDETATE SODIUM separates out the application of inhibitor as sodium carbonate solution low temperature crystallization |
| CN109777388B (en) * | 2017-11-15 | 2021-02-02 | 中石化石油工程技术服务有限公司 | Nitrate composite completion fluid with field fertilizing effect and preparation method thereof |
| CN116240010A (en) * | 2021-12-07 | 2023-06-09 | 中国石油天然气集团有限公司 | High-density solid-free completion fluid with temperature resistance of 180-200 DEG C |
| CN113930231B (en) * | 2021-12-17 | 2022-03-04 | 中海油田服务股份有限公司 | Water-based well completion fluid and preparation and application thereof |
| CN116410722B (en) * | 2021-12-30 | 2024-06-11 | 中国石油天然气集团有限公司 | Compound corrosion inhibitor for completion fluid, high-density solid-free completion fluid and preparation method thereof |
| CN116589991B (en) * | 2023-07-11 | 2023-09-15 | 西南石油大学 | Salt recrystallization inhibitor for high-density brine completion fluid system and preparation method thereof |
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| CN101555404A (en) * | 2009-05-20 | 2009-10-14 | 大庆开发区东油新技术有限公司 | Environment-friendly low-damage solidfree well control fluid and applications thereof |
| CN102533232A (en) * | 2010-12-13 | 2012-07-04 | 中国石油天然气股份有限公司 | Solid-phase-free multifunctional well completion working fluid |
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| CN101555404A (en) * | 2009-05-20 | 2009-10-14 | 大庆开发区东油新技术有限公司 | Environment-friendly low-damage solidfree well control fluid and applications thereof |
| CN102533232A (en) * | 2010-12-13 | 2012-07-04 | 中国石油天然气股份有限公司 | Solid-phase-free multifunctional well completion working fluid |
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| CN105462569A (en) * | 2015-12-25 | 2016-04-06 | 成都西油华巍科技有限公司 | Salt recrystallization inhibitor for oil and gas well and preparation method of salt recrystallization inhibitor |
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