CN102002349B - Seawater-based polyamine well completion fluid and preparation method thereof - Google Patents
Seawater-based polyamine well completion fluid and preparation method thereof Download PDFInfo
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- CN102002349B CN102002349B CN 201010542986 CN201010542986A CN102002349B CN 102002349 B CN102002349 B CN 102002349B CN 201010542986 CN201010542986 CN 201010542986 CN 201010542986 A CN201010542986 A CN 201010542986A CN 102002349 B CN102002349 B CN 102002349B
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Abstract
The invention discloses seawater-based polyamine well completion fluid, which comprises the following components in percentage by weight: 0.1 to 10 percent of polyamine, 0.1 to 10 percent of alkali chelating agent, 0.1 to 10 percent of bactericide and the balance of aqueous solution. In addition, the invention also discloses a preparation method for the seawater-based polyamine well completion fluid. The method comprises the following steps of: adding the weighed aqueous solution, polyamine, alkali chelating agent and bactericide into a circulating pool provided with a stirring device in turn, and fully stirring and circulating the mixture to obtain the polyamine well completion fluid. The polyamine well completion fluid is neutral or alkali, and the pH is 7.5 to 8.5; and the polyamine well completion fluid has strong anti-swelling inhibition function (the anti-swelling rate is over 90 percent), strong chelating capability on high valent metal cations, low interfacial tension (generally less than 1mN/m) and little damage to reservoirs, and the permeability recovery value is over 95 percent.
Description
Technical field
The present invention relates to a kind of seawater-based polyamine well completion fluid and preparation method thereof.
Background technology
Working fluid used is referred to as well finishing liquid in oil-gas field well-completion practice process.Being mainly the protection reservoir and guaranteeing job safety of well finishing liquid, so necessity has following function: (1) equilibrium strata pressure guarantees job safety; (2) have good reservoir protection ability, reduce the infringement to reservoir; (3) keep well and sleeve pipe balance stratum stable; (4) solid phase particles that carries, suspends is safeguarded the well cleaning; (5) have good antiseptic power, can slow down the corrosion to sleeve pipe and subsurface tool; (6) keep the stable of properties under long-term standing condition in pit shaft; (7) use safety, harmless to environmental and human health impacts.
The widely used seawater-based well completion fluid of offshore drilling is recessive acid chelating well finishing liquid at present, although satisfy above-mentioned performance technologies requirement, but because PH is lower, it is acid that whole system is, for the sensitivity to acid stratum, caused acid-sensitive infringement, in addition, sour environment is also had higher requirement for the slowly-releasing of subsurface tool.
Summary of the invention
Problem for prior art exists the invention provides a kind of to little seawater-based polyamine well completion fluid of reservoir damage and preparation method thereof.
A kind of seawater-based polyamine well completion fluid provided by the invention comprises following component: polyamine 0.1～10%, alkaline chelator 0.1～10%, sterilant 0.1～10%, surplus are the aqueous solution; Wherein, described per-cent is weight percentage.
Preferably, described polyamine is amine based polymer.
Preferably, described alkaline chelator is polyethylene polyamine carboxylic-acid sequestrant.
Preferably, described sterilant is the mixture of dodecyl benzyl dimethyl ammonium chloride and garlicin, and its blending ratio is 2: 1.
Preferably, the described aqueous solution is fresh water or seawater.
In addition, the present invention also provides a kind of preparation method of seawater-based polyamine well completion fluid, the method is: add successively the aqueous solution, polyamine, alkaline chelator, the sterilant of weighing in being provided with the circulatory pool of whipping appts, fully agitation cycle, namely get the polyamine well finishing liquid.
Beneficial effect of the present invention: polyamine well finishing liquid of the present invention is neutral or alkaline, and PH is 7.5-8.5; Have very strong anti-swollen inhibit feature, anti-swollen rate＞90% for high valent cationic, has very strong sequestering power; Interfacial tension is low, and little for the injury of reservoir generally lower than 1mN/m, permeability resume figure is more than 95%.Polyamine well finishing liquid of the present invention is except having the good characteristic of common well finishing liquid, completion fluid system can also be kept neutrality or the meta-alkalescence of well finishing liquid, avoid changing the structure of understressed sand, reduce the oil water interfacial tension of well finishing liquid, make the well finishing liquid row of returning fast that enters reservoir, avoid that reservoir is oozed in low hole and cause water lock effect, improve simultaneously the sequestering power of well finishing liquid, reduce high-valence cationic deposit fouling reservoir.
Embodiment
The effect of each component of the present invention: polyamine: 1. clay restraining effect, stick to clay particle surface, prevent clay swelling.2. pH value is provided, does not need alkali to regulate.3. reduce interfacial tension, reduce the resistance that oil flows out, be beneficial to well finishing liquid and return row.
Alkaline chelator: the high-valence cationic in chelating local water or seawater, prevent from producing precipitation, stop up the reservoir pore throat.Sterilant: kill the bacterium in liquid.
In embodiments of the present invention, polyamine is amine based polymer, specifically by a kind of dihydroxyl polyamines synthetic under the condition of 40～120 ℃ in one or more and oxyethane, propylene oxide or epoxy chloropropane in quadrol, hexanediamine, diethylenetriamine, triethylene tetramine, tetraethylene pentamine, the liquid mixture of trihydroxy-polyamines, tetrahydroxy polyamines or penta hydroxy group polyamines form a kind of or two kinds and above composition, molecular weight is 200～1500.Wherein the dihydroxyl polyamines accounts for 20～30%, and the trihydroxy-polyamines accounts for 15～45%, and the tetrahydroxy polyamines accounts for 25～35%.The per-cent here is weight percentage.
Alkaline chelator is polyethylene polyamine carboxylic-acid sequestrant, the mixture of diethylene triamine pentacetic acid (DTPA) and ethylenediamine tetraacetic acid (EDTA) specifically, and its blending ratio is 2: 1.The blending ratio here is weight ratio.
Sterilant is the mixture of dodecyl benzyl dimethyl ammonium chloride and garlicin, and its blending ratio is 2: 1.
Embodiment 1
The preparation of perforating fluid: at 25M
3In the circulatory pool that band stirs, add successively filtering sea (water temperature 〉=5 ℃) 23M
3, polyamine 27Kg, alkaline chelator 12Kg, sterilant 12Kg at room temperature fully stir and namely got the polyamine perforating fluid in 60 minutes.After lower complete perforating gun, the perforating fluid for preparing is pumped into perforation interval in well with slush pump, perforating fluid is the liquid that contacts with oil reservoir for the first time, so the amount of polyamine strengthens, is conducive to like this prevent hydration swelling, the migration of oil reservoir medium clay soil.
Embodiment 2
The preparation of working fluid: at 40M
3Add successively filtering sea (water temperature 〉=5 ℃) 38M in the circulatory pool that band stirs
3, polyamine 40Kg, alkaline chelator 16Kg, sterilant 24Kg at room temperature fully stir and namely got the polyamine working fluid in 60 minutes.Working fluid is used for clean-out service, perforation job, and the filling anti-sand operation, well finishing liquid used in the convergence process between embedding operation overnight directly pumps in well with slush pump.
Embodiment 3
The preparation of placement fluid: at 40M
3Add successively filtering sea (water temperature 〉=5 ℃) 38M in the circulatory pool that band stirs
3, polyamine 40Kg, alkaline chelator 16Kg, sterilant 24Kg at room temperature fully stir and namely got the polyamine placement fluid in 60 minutes.Placement fluid is used for filling anti-sand operation process well finishing liquid used, mixes by surface pump pumping in well with gravel.
Advantage of the present invention: 1, polyamine well finishing liquid of the present invention is neutral or alkaline, and PH is 7.5-8.5, can overcome part acid sensitivity reservoir and contain the acid sensitivity problem on the understressed sand stratum of clay cement; 2, interfacial tension is low, and little for the injury of reservoir generally lower than 1mN/m, permeability resume figure is more than 95%.3, for high valent cationic, very strong sequestering power is arranged; 4, have very strong anti-swollen inhibit feature, anti-swollen rate＞90% can keep the stable of the interior clay of the borehole wall for a long time.
The above, it is only preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, every foundation technical spirit of the present invention all still belongs in the scope of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment does.
Claims (5)
1. seawater-based polyamine well completion fluid, comprise following component: polyamine 0.1～10%, alkaline chelator 0.1～10%, sterilant 0.1～10%, surplus are the aqueous solution; Wherein, described per-cent is weight percentage, wherein said polyamine is by a kind of or two kinds and the above liquid mixture that forms in a kind of synthetic under the condition of 40～120 ℃ dihydroxyl polyamines, trihydroxy-polyamines and tetrahydroxy polyamines in one or more and oxyethane, propylene oxide or epoxy chloropropane in quadrol, hexanediamine, diethylenetriamine, triethylene tetramine, tetraethylene pentamine, and molecular weight is 200～1500.
2. seawater-based polyamine well completion fluid as claimed in claim 1, is characterized in that, described alkaline chelator is amido carboxylic-acid sequestrant.
3. seawater-based polyamine well completion fluid as claimed in claim 1, is characterized in that, described sterilant is the mixture of dodecyl benzyl dimethyl ammonium chloride and garlicin, and its blending ratio is 2: 1.
4. seawater-based polyamine well completion fluid as claimed in claim 1, is characterized in that, the described aqueous solution is fresh water or seawater.
5. the preparation method of a seawater-based polyamine well completion fluid as claimed in claim 1, the method is: the aqueous solution, polyamine, alkaline chelator, the sterilant that add successively weighing in being provided with the circulatory pool of whipping appts, fully agitation cycle, namely get the polyamine well finishing liquid.
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| CN 201010542986 CN102002349B (en) | 2010-11-12 | 2010-11-12 | Seawater-based polyamine well completion fluid and preparation method thereof |
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| CN 201010542986 CN102002349B (en) | 2010-11-12 | 2010-11-12 | Seawater-based polyamine well completion fluid and preparation method thereof |
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| CN102002349A CN102002349A (en) | 2011-04-06 |
| CN102002349B true CN102002349B (en) | 2013-06-19 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102433110A (en) * | 2011-10-19 | 2012-05-02 | 中国石油大学(华东) | Amine shale stabilizer for drilling fluid |
| CN103087691A (en) * | 2011-10-28 | 2013-05-08 | 中国石油化工股份有限公司 | Polyamine strong inhibitor for drilling fluid, and preparation method thereof |
| CN103773331B (en) * | 2012-10-24 | 2016-08-17 | 中国石油化工股份有限公司 | A kind of high-efficient drilling fluid and preparation method thereof |
| CN103773332B (en) * | 2012-10-24 | 2016-08-17 | 中国石油化工股份有限公司 | A kind of drilling fluid and preparation method thereof |
| CN104099069B (en) * | 2013-04-12 | 2017-02-08 | 中国石油化工股份有限公司 | Anti-temperature clay anti-swelling agent and preparation method thereof |
| CN104592955B (en) * | 2013-11-01 | 2017-08-22 | 中国石油化工股份有限公司 | A kind of polyamine shale control agent and preparation method thereof |
| CN105062435B (en) * | 2015-07-29 | 2017-12-29 | 长江大学 | Coal bed gas horizontal well small molecule drilling fluid |
| CN115703961B (en) * | 2021-08-03 | 2023-10-20 | 中国石油化工股份有限公司 | Liquid-phase injury prevention system and preparation method and application thereof |
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| CN1660957A (en) * | 2004-02-23 | 2005-08-31 | 中海石油（中国）有限公司天津分公司 | Cryptomorphic acid conformity type completion fluid |
| CN101522851A (en) * | 2006-10-11 | 2009-09-02 | 贝克休斯公司 | In situ fluid formation for cleaning oil-or synthetic-oil-based mud |
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| CN1660957A (en) * | 2004-02-23 | 2005-08-31 | 中海石油（中国）有限公司天津分公司 | Cryptomorphic acid conformity type completion fluid |
| CN101522851A (en) * | 2006-10-11 | 2009-09-02 | 贝克休斯公司 | In situ fluid formation for cleaning oil-or synthetic-oil-based mud |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: China Oilfield Services Limited Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: China Oilfield Services Limited Patentee before: China National Offshore Oil Corporation |