CN101619208A - Acid-resisting and oil-resisting type foam plugging agent - Google Patents

Acid-resisting and oil-resisting type foam plugging agent Download PDF

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Publication number
CN101619208A
CN101619208A CN200910163127A CN200910163127A CN101619208A CN 101619208 A CN101619208 A CN 101619208A CN 200910163127 A CN200910163127 A CN 200910163127A CN 200910163127 A CN200910163127 A CN 200910163127A CN 101619208 A CN101619208 A CN 101619208A
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oil
foam
gas
resisting
percent
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CN101619208B (en
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刘合
周万富
王鑫
刘向斌
王海静
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Petrochina Co Ltd
Daqing Oilfield Co Ltd
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Daqing Oilfield Co Ltd
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Abstract

The invention discloses an acid-resisting and oil-resisting type foam plugging agent which is prepared in such a way that CO2 is mixed with a foam solution according to a subsurface volume ratio of 1.5 to 1, wherein the foam solution is prepared from the following materials by weight percent: 0.9 percent of sodium dodecyl benzene sulfonate, 0.4 percent of modified guargum, 0.1 percent of hydroxyethyl cellulose, 0.1 percent of lauryl alcohol and the balance of water. The invention is used for plugging a test well gas channeling passage, improving gas suction and a liquid generating section plane, reducing the gas-oil ratio, solving the problem of gas channeling emerged from low-permeability oil deposit gas injection development and providing technical support for the low permeable oil deposit gas injection development.

Description

A kind of acid-resisting and oil-resisting type foam plugging agent
Technical field:
The present invention relates to a kind of foam plugging agent in the oil recovery field, oil field, especially a kind of selectively blocking off CO that is used for 2The foam plugging agent of has channeling layer.
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.In case the generation has channeling, the swept volume of gas descends, and has a strong impact on the gas injection development effect.
Summary of the invention:
In order to overcome the deficiency in the background technology, the invention provides a kind of acid-resisting and oil-resisting type foam plugging agent.The present invention is used for carbon dioxide flooding injection-production well shutoff has channeling layer, can carry out shutoff to injection-production well well group has channeling layer effectively, makes the gas injection development oil field effective more economically.
The technical solution adopted in the present invention is: this acid-resisting and oil-resisting type foam plugging agent is by CO 2Is to mix at 1.5: 1 with foam solution by the subsurface volume ratio, foam solution is made up of Sodium dodecylbenzene sulfonate, modification guanidine glue, Natvosol, lauryl alcohol and water, Sodium dodecylbenzene sulfonate accounts for 0.9% by mass percentage, modification guanidine glue accounts for 0.4%, Natvosol accounts for 0.1%, and lauryl alcohol accounts for 0.1% and the water of surplus.
Drop into the whipping agent Sodium dodecylbenzene sulfonate according to the above ratio in water, the limit adds the waterside stirring at low speed, until mixing, adds modification guanidine glue, Natvosol, lauryl alcohol then in proportion, and stirring at low speed is evenly made mixing solutions; On ground with liquid CO 2Is to mix at 1.5: 1 with the foam solution for preparing by the subsurface volume ratio, and mixed liquid is injected in the different intervals by oil pipe.
The principle that control gas of the present invention increases oil is: 1. utilize the selection of foam to hypertonicity and low oil saturation under sour environment, effective high oil reservoir high permeability zone of shutoff gas drive degree, utilize the good suds-stabilizing agent of performance to increase foamy stability again, prolong the validity period of shutoff, guarantee follow-up injection CO 2Turn to, improve crude production rate; 2. utilize foaming agent to meet oil and be difficult for blistered principle, in the high place of gas input well oil saturation, thereby the surfactant component in the foaming agent can be done oil-displacing agent displacement of reservoir oil raising crude production rate; 3. in producing well, utilize foaming agent to meet the blistered principle shutoff of gas has channeling passage, improve the section of giving vent to anger, improve crude production rate.
The present invention has following beneficial effect: the foam volume and the transformation period of existing foam formulation system foaming agent under acid and environment that oil saturation is higher all do not reach corresponding economic and technical norms, effectively shutoff injection-production well has channeling layer.The foam formulation system that the present invention relates to has been compared following advantage with existing foam allocation system: 1, the stratum compatibleness is strong, temperature, salinity, pH value subject range to the stratum are big, adapting to near-bottom temperature can be up to 180 ℃, the scope of application of salinity is up to 20000mg/L, pH value subject range is 2～8, and the subject range of oil saturation is 0～60%; 2, under the situation of oil saturation 60%, PH=3, the coefficient of expansion is greater than 4.5, and the transformation period of foaming agent reaches 83 hours; 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 density of foaming agent change curve;
Fig. 2 suds-stabilizing agent concentration curve;
Fig. 3 vapour-liquid ratio graphic representation;
Fig. 4 foam envelope is scurried the injection performance graph;
Fig. 5 virtue 188-138 well injection pressure change curve;
Gas drive front test result comparison diagram before and after Fig. 6 foam envelope is scurried.
Embodiment:
The invention will be further described below in conjunction with embodiment:
Embodiment 1, paddling process measure whipping agent: during mensuration be that 0.3% foaming agent solution has been poured in the graduated transparent measuring cup of agitator band with 100ml concentration, stirring 60s under (3000r/min) at a high speed, the time that time when writing down lather volume and isolating half liquid volume from foam and foam reduce to half, the former represents latherability (foam volume), and both represent froth stability (transformation period) back.Experimental result sees Table 1.
Whipping agent foam volume and transformation period table 1
Whipping agent Foam volume (mL) The liquid phase transformation period (min) Half foam life period (h)
??KQ-1 ??560 ??6 ??6.33
??KQ-5 ??570 ??7 ??4.83
??KQ-7 ??570 ??5 ??3
??LHE ??505 ??5 ??11.25
??BJ ??520 ??7 ??14.17
??LHU ??510 ??6 ??14.25
??NY-1 ??510 ??5 ??15.08
??NY-2 ??500 ??4 ??12
??G-1 ??495 ??20 ??69.32
??G-2 ??495 ??15 ??50.42
??G-3 ??490 ??20 ??49.08
??SD-3 ??492 ??35 ??71.93
??L-1 ??495 ??15 ??47.10
??L-2 ??500 ??11 ??52.08
??L-3 ??520 ??20 ??67.33
The result shows: the foam volume of these 15 kinds of whipping agents all meets the requirements, but Sodium dodecylbenzene sulfonate is that transformation period of SD-3 is longer, reaches 71.93h.
Embodiment 2, whipping agent SD-3 (Sodium dodecylbenzene sulfonate) concentration determination: SD-3 (Sodium dodecylbenzene sulfonate) is made into different concns, carries out foam volume and transformation period test with paddling process, test environment PH=3, experimental result is seen Fig. 1.
The result shows: when density of foaming agent reached 0.9%, the transformation period reached maximum.Show that this moment, more active agent molecule aligned at liquid-gas interface, the effect of nonpolar part increases, and the liquid film drain age velocity reduces, and froth stability strengthens.
Embodiment 3, suds-stabilizing agent and concentration determination thereof: in order further to strengthen foamy stability, carried out the suds-stabilizing agent determination experiment, draw through comparative analysis, modification guanidine glue, Natvosol, lauryl alcohol are through composite back better effects if, the ratio of its consumption is 4: 1: 1 o'clock best results, is called as suds-stabilizing agent after modification guanidine glue, Natvosol and lauryl alcohol are composite.In the suds-stabilizing agent concentration determination, whipping agent SD-3 (Sodium dodecylbenzene sulfonate) working concentration is 0.9%, and during test environment PH=3, the concentration of suds-stabilizing agent is that 0.6% o'clock each side net effect is best, and experimental result is seen Fig. 2.
Embodiment 4, foam profile control system performance evaluation: get the eight factory's water samples that recover the oil, determined the foam profile control system.Experimental result sees the following form 2, and the foam volume of plugging agent has reached 400mL under the situation of pH=3, oil saturation 60%, half foam life period has reached 83h, as can be known foaming agent acid-resisting and oil-resisting functional.
Foam profile control agent over-all properties table table 2
Figure G2009101631274D00041
Embodiment 5, vapour-liquid ratio are to foam resistance factor influence experiment: vapour-liquid ratio is an important parameter of foam control has channeling technology, and it has not only influenced the quality of acid-resisting and oil-resisting type foam, but also provides necessary parameter for field conduct.Because vapour-liquid ratio is too small, foaming agent can not effectively be foamed, and resistance factor is little, and profile control effect is poor; Vapour-liquid ratio is excessive, and is uneconomical on the one hand, causes the foam instability on the other hand.This experiment has been carried out experiment altogether and has been carried out (0.5,1,1.5,2,3) altogether: 5 gas-liquid ratios such as 1.Evaluation result is seen Fig. 3.
Carbon dioxide foaming vapour-liquid ratio optimization experiment is the result show: crossing low or too high vapour-liquid ratio all can influence the foamy quality, and vapour-liquid ratio is crossed when hanging down, and foam produces slowly and measure few, and the pressure that forms in rock core is low, and resistance factor is little; When gas-liquid was too high, the froth quality of generation was poor, and show that mainly foam is big and sparse, easily go out, poor stability, the resistance factor in rock core descends.The optimum gas liquor ratio of acid-resisting and oil-resisting type foam plugging agent is 1.5: 1, and resistance factor reaches about 450.
Embodiment 6, injection speed influence the foamy resistance factor:
Experimental temperature is 85 ℃ of reservoir temperatures, and the foaming agent system is above-mentioned acid-resisting and oil-resisting type foam plugging agent, and vapour-liquid ratio is 1.5: 1, and core permeability is 0.200 μ m 2About.The foam injection speed is that 2.0～4.5mL/min selects 6 points, and experimental result sees Table 3.When injection speed is hanged down, air pump can't be opened, so the time have only liquid to pass through, when injection speed during greater than 2mL/min, this moment, air pump could works better, as can be seen from the figure when injection speed is 3mL/min, resistance factor maximum value 425, illustrate that this moment, foam formed, can form good shutoff, along with the continuation increase resistance factor variation of injection speed is little.
The foam injection speed is to the table 3 that influences of plugging effect
Injection speed (mL/min) Basis pressure reduction (MPa) Operting differential pressure (MPa) Resistance factor
??2 ??0.042 ??12.6 ??300
??2.5 ??0.05 ??19.7 ??394
??3 ??0.061 ??25.9 ??425
??3.5 ??0.071 ??28.5 ??401
??4 ??0.082 ??29.2 ??356
??4.5 ??0.091 ??29.5 ??324
Embodiment 7, different oil saturation are tested the influence of foam blocking ability:
Experimental temperature is 85 ℃ of reservoir temperatures, and the foaming agent system is above-mentioned acid-resisting and oil-resisting type foam plugging agent, and vapour-liquid ratio is 1.5: 1, and core permeability is 0.200 μ m 2, injection speed 3mL/min.Experimental result sees Table 4.By experimental result as can be known: oil saturation is that resistance factor has reached 120 under 60% the situation, and the oil-proofness of foaming agent is better, can satisfy the requirement of effective shutoff has channeling passage.
Core oil saturation influences experimental result table 4 to resistance factor
Residual oil saturation (%) Basis pressure reduction (MPa) Operting differential pressure (MPa) Resistance factor
??0 ??0.066 ??29 ??459
??38 ??0.068 ??30.3 ??445
??49 ??0.062 ??11.3 ??182
??60 ??0.065 ??7.8 ??120
Example 16 days～November 20 October in 8,2007 carried out the foam envelope at fragrant 188-138 well and scurried test in place, accumulative total is injected foaming agent 480m 3, CO 2533t, inhibiter 70m 3, adopting the mode of alternately injecting, foam solution is made up of 0.9% Sodium dodecylbenzene sulfonate, 0.4% modification guanidine glue, 0.1% Natvosol, 0.1% lauryl alcohol and 98.5% water, and vapour-liquid ratio is 1.5: 1.The injection pressure of foaming agent 4.3MPa's 4.5MPa that raise during foam envelope is scurried, gas injection pressure have raise, and inject and dynamically see Fig. 4.
(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. 5.
(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. 6 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 5 together with the oil well production situation at present.
Virtue 48 pilot test districts present condition of production table table 5
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 acid-resisting and oil-resisting type foam plugging agent is characterized in that: by CO 2Is to mix at 1.5: 1 with foam solution by the subsurface volume ratio, foam solution is made up of Sodium dodecylbenzene sulfonate, modification guanidine glue, Natvosol, lauryl alcohol and water, Sodium dodecylbenzene sulfonate accounts for 0.9% by mass percentage, modification guanidine glue accounts for 0.4%, Natvosol accounts for 0.1%, and lauryl alcohol accounts for 0.1% and the water of surplus.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102854286A (en) * 2011-06-27 2013-01-02 中国石油大学(北京) Measuring method for performance of foaming agent
CN108003854A (en) * 2017-11-23 2018-05-08 中国石油天然气股份有限公司 A kind of buried hill fissure oil reservoir alters agent and its method for implanting with envelope
CN111139051A (en) * 2020-04-07 2020-05-12 山东新港化工有限公司 Foam channeling sealing agent for CO2 flooding of heavy oil reservoir and preparation method and application thereof

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* Cited by examiner, † Cited by third party
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
CN100569895C (en) * 2004-12-09 2009-12-16 中国石化胜利油田有限公司地质科学研究院 A kind of foaming agent that improves conventional oil deposil erude petroleum recovery ratio and preparation method thereof
CN100591742C (en) * 2005-01-07 2010-02-24 中国石化胜利油田有限公司地质科学研究院 Method of raising oil deposit crude petroleum recovery ratio

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102854286A (en) * 2011-06-27 2013-01-02 中国石油大学(北京) Measuring method for performance of foaming agent
CN102854286B (en) * 2011-06-27 2014-10-15 中国石油大学(北京) Measuring method for performance of foaming agent
CN108003854A (en) * 2017-11-23 2018-05-08 中国石油天然气股份有限公司 A kind of buried hill fissure oil reservoir alters agent and its method for implanting with envelope
CN111139051A (en) * 2020-04-07 2020-05-12 山东新港化工有限公司 Foam channeling sealing agent for CO2 flooding of heavy oil reservoir and preparation method and application thereof

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Effective date of registration: 20200923

Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No.

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