CN101619210A - Carbon dioxide foam stabilizer suitable for low-permeability oil deposit - Google Patents
Carbon dioxide foam stabilizer suitable for low-permeability oil deposit Download PDFInfo
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- CN101619210A CN101619210A CN200910163128A CN200910163128A CN101619210A CN 101619210 A CN101619210 A CN 101619210A CN 200910163128 A CN200910163128 A CN 200910163128A CN 200910163128 A CN200910163128 A CN 200910163128A CN 101619210 A CN101619210 A CN 101619210A
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- carbon dioxide
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Abstract
The invention discloses a carbon dioxide foam stabilizer suitable for low-permeability oil deposit, which is prepared from modified guargum, hydroxyethyl cellulose and lauryl alcohol, wherein the mass ratio of the modified guargum to the hydroxyethyl cellulose to the lauryl alcohol is 4 to 1 to 1. The invention is used for enhancing the stability of carbon dioxide foams, thereby the carbon dioxide foam stabilizer can plug a test well gas channeling passage, improve gas suction and a liquid generating section plane, reduce the gas-oil ratio, solve the problem of gas channeling emerged from low-permeability oil deposit gas injection development and provide technical support for the low permeable oil deposit gas injection development.
Description
Technical field:
The present invention relates to a kind of suds-stabilizing agent in the oil recovery field, oil field, especially a kind of low-permeability oil deposit carbon dioxide foam stabilizer that is applicable to.
Background technology:
In recent years, the newly-increased reserves in the peripheral oil field of grand celebration belong to hyposmosis and susceptibility reservoir more, and the difficulty of waterflooding is big or do not have an economic benefit.With constantly riseing of international oil price, adopt and annotate CO
2Displacement of reservoir oil mode can obtain development effectiveness preferably.But because CO
2Viscosity little, than the easier generation fingering of water phenomenon, inject for a long time, gas channeling phenomenon is serious.Can carry out shutoff by carbon dioxide foaming at this problem.And conventional at present suds-stabilizing agent mainly is a polymkeric substance, and being added in of polymkeric substance prolonged the foamy transformation period to a certain extent, but amplitude is undesirable, and polymkeric substance is anti-shearing very poor with high-temperature resistance simultaneously, has had a strong impact on foamy stability.The polymers soln initial viscosity of 700mg/L is approximately 40mPa.s big appointment after polymer-injecting pump is sheared and is reduced to about 50% of initial viscosity, while is (pH=3) polymers soln degraded especially severe under the formation temperature and sour environment more than 85 ℃, and almost the viscosity with tap water is suitable.
Summary of the invention:
In order to overcome the deficiency in the background technology, the invention provides a kind of low-permeability oil deposit carbon dioxide foam stabilizer that is applicable to.The present invention combines with pore forming material and is used for carbon dioxide injection and drives injection-production well shutoff has channeling layer, makes the gas injection development oil field effective more economically.
The technical solution adopted in the present invention is: this stablizer is made up of modification guanidine glue, Natvosol, lauryl alcohol, and the mass ratio of modification guanidine glue, Natvosol and lauryl alcohol is 4: 1: 1.
Its principle that improves froth stability is: 1. modification guanidine glue mainly slows down foamy discharge opeing speed by the viscosity that improves base fluid, prolong half-life, thus improve foamy stability; 2. Natvosol improves the quality of foam film, increases the visco-elasticity of film, reduces the foamy ventilation property, thereby improves foamy stability; 3. lauryl alcohol has the effect of solubilising, and high fatty alcohol and active agent molecule are spaced, and reduces the repulsive force between the active agent molecule, increases foamy stability.
The present invention has following beneficial effect: present conventional suds-stabilizing agent mainly is a polymkeric substance, being added in of polymkeric substance prolonged the foamy transformation period to a certain extent, but amplitude is undesirable, and polymkeric substance is anti-shearing very poor with high-temperature resistance simultaneously, has had a strong impact on foamy stability.The polymers soln initial viscosity of 700mg/L is approximately 40mPa.s big appointment after polymer-injecting pump is sheared and is reduced to about 50% of initial viscosity, while is (pH=3) polymers soln degraded especially severe under the formation temperature and sour environment more than 85 ℃, and almost the viscosity with tap water is suitable.The suds-stabilizing agent that the present invention relates to is compared following advantage with existing suds-stabilizing agent: 1, this stablizer by Natvosol, lauryl alcohol, modification guanidine glue composite form have temperature resistance, anti-oil, anti-shearing good characteristic; 2, the stratum compatibleness is strong, and is big to temperature, salinity, the pH value subject range on stratum; 3, good, the on-the-spot preparation of solvability is simple, cost performance is high; 4, good, nontoxic, the free from extraneous odour of safety performance.
Description of drawings:
Fig. 1 suds-stabilizing agent concentration curve;
Fig. 2 foam envelope is scurried the injection performance graph;
Fig. 3 virtue 188-138 well injection pressure change curve;
Gas drive front test result contrast before and after Fig. 4 foam envelope is scurried.
Embodiment:
The invention will be further described below in conjunction with embodiment:
Whipping agent foam volume and transformation period table 1
| The plugging agent title | Lather volume mL | Liquid phase transformation period min |
| ??0.9％GP | ??450 | ??58 |
| The 0.9%GP+0.6% polymkeric substance | ??/ | ??/ |
| 0.9%GP+0.6% modification guanidine glue | ??410 | ??301 |
| The 0.9%GP+0.6% Mierocrystalline cellulose | ??400 | ??291 |
| The 0.9%GP+0.6% lauryl alcohol | ??435 | ??62 |
| 0.9%GP+0.4% guanidine glue+0.1% Natvosol+0.1% lauryl alcohol | ??410 | ??487 |
The result shows: it is better that the stablizer after composite surely steeps effect, and the liquid phase transformation period reaches 487min.And polymkeric substance does not foam under sour environment, steady bubble DeGrain when lauryl alcohol uses separately, and the liquid phase transformation period is only improved 4min, so suds-stabilizing agent is elected the compound of modification guanidine glue, Natvosol, lauryl alcohol as.
Embodiment 2, in the suds-stabilizing agent optimization experiment, draw through comparative analysis, modification guanidine glue, Natvosol, lauryl alcohol are through composite back better effects if, the ratio of its quality is 4: 1: 1 o'clock best results.In the stabilizer concentration test, whipping agent GP (Sodium dodecylbenzene sulfonate) working concentration is 0.9%, during test environment PH=3, suds-stabilizing agent (by modification guanidine glue, Natvosol account for, lauryl alcohol forms by mass ratio at 4: 1: 1) mass concentration be that 0.6% o'clock each side net effect is best, experimental result is seen Fig. 1.
Embodiment 3, foam profile control system performance evaluation: get the eight factory's water samples that recover the oil, prepared the foam profile control system with suds-stabilizing agent of the present invention.Experimental result sees the following form 2:
Foam profile control agent over-all properties table table 2
Experimental result shows: this system disposes the foam volume that oil saturation reaches at 60% o'clock at clear water configuration and sewage and all reaches 400mL, half foam life period reaches 83h simultaneously, illustrate that this system is subjected to the influence of salinity and oil saturation little, the steady bubble effect of stablizer is fine.
Example 3, this stablizer (by modification guanidine glue, Natvosol account for, lauryl alcohol forms by mass ratio at 4: 1: 1) be mixed and made into by a certain percentage with the carbon dioxide foaming agent and carried out the foam envelope 16 days～November 20 October in 2007 at fragrant 188-138 well behind the carbonic acid gas plugging agent and scurry test in place, accumulative total is injected plugging agent 480m
3, CO
2533t, inhibiter 70m
3, adopting the mode of alternately injecting, vapour-liquid ratio is 2: 1.The injection pressure of plugging agent 4.3MPa's 4.5MPa that raise during foam envelope is scurried, gas injection pressure have raise, and inject and dynamically see Fig. 2.
(1) the injection pressure 3MPa that raise after the measure:
Owing to serious has channeling problem stops gas injection, the foam envelope was scurried back injection pressure raise 3MPa, day fluid injection attitude carbonic acid gas 15m at present when recovering gas injection before virtue 188-138 well foam envelope was scurried
3/ d, gas injection pressure 13.0MPa and compares the gas injection pressure 2.5MPa that risen before envelope is scurried, and fragrant 188-138 well injection pressure changes sees Fig. 3.
(2) advantage inspiratory direction and gas drive front spread situation have all taken place than obvious variation
Scurry the front and back gas drive front by contrast foam envelope, the advantage inspiratory direction of fragrant as can be seen 188-138 well and gas drive front spread situation have all taken place than obvious variation, the direction of advancing by leaps and bounds of carbonic acid gas is reduced to one by three, and gas drive involved width 387.6m gas drive and involves length 423.5m gas drive sweep area 7.6 * 10 before envelope was scurried
4m
2, gas drive involved width 420.0m gas drive and involves length 545.5m gas drive sweep area 8.8 * 10 after envelope was scurried
4m
2, the sweep area of gas drive increases, and has reached shutoff has channeling passage and has enlarged the sweep area purpose, and the gas drive front monitoring result was seen Fig. 4 before and after the foam envelope was scurried.
(3) the connection oil well has been seen and has significantly been increased oily sending down abnormally ascending effect:
5 mouthfuls of oil wells that are communicated with owing to serious has channeling problem before the foam envelope is scurried adopt the mode of intermittent type opening well and making production, after scurrying, the foam envelope obtained sending down abnormally ascending oil increasing effect preferably, all the other 4 mouthfuls of oil wells can be kept continuous production except that the long-term closing well of fragrant 190-136, fragrant 190-140 has channeling was the most serious before envelope was scurried, the content of carbonic acid gas is up to about 90% in the sleeve pipe gas, because of the casing pressure height, gas production rate greatly can't ordinary production, the casing pressure of this well was dropped to the 1.2MPa in September, 2008 after envelope was scurried by the 3.72Mpa in December in 2007, the content of carbonic acid gas reduces to 74.24% in the sleeve pipe gas, and this gas well gas oil ratio is 69.9m at present
3/ m
3, can guarantee normal continuous production, show that foam seals the effect of playing the control has channeling of scurrying.
This well group well oil output 34 tons/month before by shutoff rise to average 68 tons/month at present.Oil well drives a well behind the stable yield, increases 301 tons of oil together with oil well accumulative total.Virtue 48 pilot test districts see Table 3 together with the oil well production situation at present.
Virtue 48 pilot test districts present condition of production table table 3
Modification guanidine glue is provided by Dongying river, Shandong source chemical company in the foregoing description, and model is WP-1;
Natvosol is provided by the auspicious safe Mierocrystalline cellulose in Hubei limited liability company, and model is HQ-1;
Inhibiter is provided by the sincere chemical company in Beijing, and model is BUCT-1.
Claims (1)
1, a kind of low-permeability oil deposit carbon dioxide foam stabilizer that is applicable to, it is characterized in that: this stablizer is made up of modification guanidine glue, Natvosol, lauryl alcohol, and the mass ratio of modification guanidine glue, Natvosol and lauryl alcohol is 4: 1: 1.
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|---|---|---|---|
| CN2009101631289A CN101619210B (en) | 2009-08-18 | 2009-08-18 | Carbon dioxide foam stabilizer suitable for low-permeability oil deposit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101631289A CN101619210B (en) | 2009-08-18 | 2009-08-18 | Carbon dioxide foam stabilizer suitable for low-permeability oil deposit |
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| CN101619210A true CN101619210A (en) | 2010-01-06 |
| CN101619210B CN101619210B (en) | 2011-11-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101747878A (en) * | 2010-01-28 | 2010-06-23 | 大庆石油管理局 | Atomization foam drilling fluid |
| CN113122193A (en) * | 2019-12-31 | 2021-07-16 | 中石化石油工程技术服务有限公司 | Low-molecular-weight high-temperature foam stabilizer and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1051193A (en) * | 1989-10-21 | 1991-05-08 | 大庆石油管理局采油工艺研究所 | The whipping agent that preparing foam fracturing liquid is used |
| CN1524921A (en) * | 2003-02-28 | 2004-09-01 | 中国石油天然气股份有限公司 | Foaming agent and acidic cross-linking foam breakdown fluid |
-
2009
- 2009-08-18 CN CN2009101631289A patent/CN101619210B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101747878A (en) * | 2010-01-28 | 2010-06-23 | 大庆石油管理局 | Atomization foam drilling fluid |
| CN101747878B (en) * | 2010-01-28 | 2013-01-02 | 大庆石油管理局 | Atomization foam drilling fluid |
| CN113122193A (en) * | 2019-12-31 | 2021-07-16 | 中石化石油工程技术服务有限公司 | Low-molecular-weight high-temperature foam stabilizer and preparation method thereof |
| CN113122193B (en) * | 2019-12-31 | 2022-07-12 | 中石化石油工程技术服务有限公司 | Low-molecular-weight high-temperature foam stabilizer and preparation method thereof |
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| CN101619210B (en) | 2011-11-09 |
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Effective date of registration: 20200922 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee after: PetroChina Co.,Ltd. Patentee after: Daqing Oilfield Co.,Ltd. Address before: 163453 No. 233, south section of Central Avenue, Daqing, Heilongjiang Patentee before: Daqing Oilfield Co.,Ltd. |
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