CN101892037A - Novel salt-resistant gel selective water shutoff agent - Google Patents
Novel salt-resistant gel selective water shutoff agent Download PDFInfo
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- CN101892037A CN101892037A CN2010102336146A CN201010233614A CN101892037A CN 101892037 A CN101892037 A CN 101892037A CN 2010102336146 A CN2010102336146 A CN 2010102336146A CN 201010233614 A CN201010233614 A CN 201010233614A CN 101892037 A CN101892037 A CN 101892037A
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Abstract
The invention discloses a novel salt-resistant gel selective water shutoff agent. The agent mainly comprises the following components in percentage by weight: 0.54 to 0.64 percent of cationic polyacrylamide, 0.8 to 1.6 percent of cross-linking agent, 0.9 to 1.2 percent of phenol, 0.02 to 0.6 percent of regulator, 0 to 4 percent of NaCl and the balance of water. The novel salt-resistant gel selective water shutoff agent of the invention is a cross-linked polymer system which is temperature-resistant and salt-resistant, has adjustable gelation time and overcomes the problem of poor oily water selectivity in the conventional water shutoff technology. The water shutoff rate of the selective water shutoff agent is over 95 percent; the oil shutoff rate is below 30 percent; the temperature resistance is up to 85 DEG C; the mineralization resistance (counted by sodium chloride) is 40,000 mg/L (solution preparation is based on seawater) at most; and the gelation time is more than 96 hours.
Description
Technical field
The present invention relates to a kind of novel salt-resistant gel selective water shutoff agent with good selective blocking outlet capacity.
Background technology
At present, well water is a ubiquity and an inevitable problem in the oil-field development.Along with the continuous exploitation in oil field, enter high moisture or ultra-high water-containing waterflood stage, contradiction is more outstanding in oil reservoir plane, interlayer and the layer, inject water and often charge into oil well along most permeable zone, cause oil well productivity to descend, have a strong impact on the water drive development effectiveness, thereby influence the oil-production efficiency in oil field.For addressing this problem, people adopt the measure of implementing water blockoff at high water-cut stage usually.
For oil-field development, the not stifled oil of the best water blockoff of plugging agent, promptly required plugging agent has good selective blocking outlet capacity, and existing technology mainly shows the poor selectivity to profit.For polymer-type selective plugging agent and active viscous crude blocking agent, less than 80%, oil base cement is to the plugging rate height of water to the plugging rate of water, but oil base cement also can solidify in the oil-containing duct, to the plugging rate of oil greater than 70%.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of novel salt-resistant gel selective water shutoff agent, temperature resistance, and salt tolerant, gelation time is adjustable, has overcome the problem of existing water-plugging technique to the poor selectivity of profit.
Novel salt-resistant gel selective water shutoff agent provided by the invention mainly comprises: cationic polyacrylamide 0.54%～0.64%, linking agent 0.8～1.6%, phenol 0.9～1.2%, conditioning agent 0.4～0.6%, NaCl 0～4%, and surplus is a water; Wherein, described per-cent is weight percentage.
Preferably, described linking agent is urotropine (hexamethylenetetramine).
Preferably, described conditioning agent is an oxalic acid.
Novel salt-resistant gel selective water shutoff agent of the present invention is a kind of crosslinked polymeric system, and temperature resistance, salt tolerant, gelation time is adjustable, has overcome the problem of existing water-plugging technique to the poor selectivity of profit.Selective water shutoff agent water plugging rate of the present invention is greater than 95%; Oil plugging rate is less than 30%; Temperature resistance reaches 85 ℃; The highest 40000mg/L of anti-salinity (in sodium-chlor) (is the dosing basis with the seawater); Gel time was greater than 96 hours.
Embodiment
According to following steps configuration selective water shutoff agent of the present invention.
(1) cationic polyacrylamide (PAM) the solution 100ml of preparation 1%, dissolved expanding 24 hours; 5% phenol solution 100ml; 10% urotropine (hexamethylenetetramine) solution 100ml; 2% oxalic acid solution 10ml, standby to stay.
(2) the NaCl solution 10ml that gets 1% the cationic polyacrylamide solution 54ml that prepared, 5% phenol solution 22ml, 10% urotropine solution 13ml, 2% oxalic acid solution 1ml and 40% fully stirs in beaker, obtains required sample.
Per-cent in step (1) and the step (2) all is weight percentage.
Urotropine is heated and slowly releases formaldehyde, formaldehyde and phenol condensation, and its condensation product and cationic polyacrylamide are crosslinked, form gel.Gel water-plugging agent by cationic polyacrylamide, linking agent, three kinds of feedstock production of phenol is to be the plural gel body of main component with cationic polyacrylamide-resol, in addition, also have part methylolphenol, methylene base cation polypropylene amides gel etc.The maintenance of novel salt-resistant gel selective water shutoff agent
Blocking agent formula table 1-1
Blocking agent is filled a prescription into glue information slip 1-2
The novel salt-resistant gel selective water shutoff agent core experiment is estimated
In order to study the shut-off capacity of novel salt-resistant gel selective water shutoff agent, adopt synthetic core that it is estimated, measure its shutoff respectively to water and kerosene.Experimentation is, at first with rock core 6-120 saturation water, measures its water phase permeability, with rock core 60-14,60-13 saturated oil, measures its permeability to oil simultaneously, then with the 60-13 water drive to oil saturation 50%.(wherein, 60-13, the relative 6-120 of 60-14 rock core, 6-106 perm-plug method are about 10%)
Then with rock core 6-120 with after rock core 60-14 is in parallel, oppositely drive in the aqueous solution (No. 6 prescriptions) of novel salt-resistant gel selective water shutoff agent, treat that 6-120 displaces first polymkeric substance after, stop displacement.With rock core 6-120 and rock core 60-14 as in 85 ℃ of water-baths, behind the maintenance 16h, measuring its permeability variation situation in the displacing fluid environment.Rock core 6-106 and 60-13 also are same quadrat method (oil plugging rate are in the test of rock core in parallel, and all blocking agents are the salt solution preparation, satisfies salinity and requires).
According to above-mentioned experimental technique, record the penetration value situation that novel salt-resistant gel selective water shutoff agent stops up each synthetic core of front and back, experimental result is as shown in table 2.
The selectivity of table 2 novel salt-resistant gel selective water shutoff agent is stopped up performance
By the sealing ratiod calculation formula:
Can calculate the sealing ratiod of novel salt-resistant gel selective water shutoff agent for water and oil phase, calculation result such as table 3 according to the penetration value of last table.
Table 3 sealing ratiod result calculates
As shown in Table 3, novel salt-resistant gel selective water shutoff agent has very big otherness for the plugging effect of water and oil, its sealing ratiod for water is higher than 95%, and for the sealing ratiod of oil less than 30%, water plugging rate is higher than oil plugging rate far away, plugging agent has good selectively blocking off effect, (the not stifled oil of water blockoff is comparatively speaking to have reached the not requirement of stifled oil of the needed water blockoff of selectivity blocking agent, unintelligible is fully stifled oil), thus the sweep efficiency of raising water has improved the recovery ratio of crude oil.
In sum; being preferred embodiment of the present invention only below, is not to be used to limit protection scope of the present invention, therefore; all any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. a novel salt-resistant gel selective water shutoff agent is characterized in that, comprising: cationic polyacrylamide 0.54%～0.64%, linking agent 0.8～1.6%, phenol 0.9～1.2%, conditioning agent 0.4～0.6%, NaCl 0～4%, and surplus is a water; Wherein, described per-cent is weight percentage.
2. selective water shutoff agent as claimed in claim 1 is characterized in that, described linking agent is urotropine (hexamethylenetetramine).
3. selective water shutoff agent as claimed in claim 1 is characterized in that, described conditioning agent is an oxalic acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010102336146A CN101892037A (en) | 2010-07-19 | 2010-07-19 | Novel salt-resistant gel selective water shutoff agent |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102336146A CN101892037A (en) | 2010-07-19 | 2010-07-19 | Novel salt-resistant gel selective water shutoff agent |
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| CN101892037A true CN101892037A (en) | 2010-11-24 |
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| CN2010102336146A Pending CN101892037A (en) | 2010-07-19 | 2010-07-19 | Novel salt-resistant gel selective water shutoff agent |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102807849A (en) * | 2012-04-06 | 2012-12-05 | 中国石油大学(华东) | Gel plugging agent for deep profile control of higher temperature oil reservoir and preparation method of gel plugging agent |
| CN103408703A (en) * | 2013-08-06 | 2013-11-27 | 西安石油大学 | Liquid polymeric microspheres and synthetic method thereof |
| CN104152123A (en) * | 2013-05-13 | 2014-11-19 | 中国石油化工股份有限公司 | Cationic chemical plugging agent and preparation method thereof |
| CN106634906A (en) * | 2016-09-18 | 2017-05-10 | 中国石油大学(华东) | Gel with high temperature resistance |
| CN106753297A (en) * | 2016-11-16 | 2017-05-31 | 中国海洋石油总公司 | A kind of anti-salt type polymer gel profile control agent |
| CN110144200A (en) * | 2019-06-14 | 2019-08-20 | 黑龙江益瑞化工有限公司 | A kind of oilfield chemistry oil recovery copolymer elastic gel class profile control agent |
| CN110205107A (en) * | 2019-06-21 | 2019-09-06 | 黑龙江益瑞化工有限公司 | A kind of oilfield chemistry oil recovery compound ion class water plugging profile control agent and preparation method thereof |
| CN114106799A (en) * | 2020-08-26 | 2022-03-01 | 中国海洋石油集团有限公司 | Bisphenol S and hexamethylenetetramine cross-linked high-temperature-resistant gel plugging agent |
Citations (1)
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| CN101481604A (en) * | 2009-01-19 | 2009-07-15 | 中国石油大学(华东) | Gel foam selective water blockoff agent and use thereof |
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- 2010-07-19 CN CN2010102336146A patent/CN101892037A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101481604A (en) * | 2009-01-19 | 2009-07-15 | 中国石油大学(华东) | Gel foam selective water blockoff agent and use thereof |
Non-Patent Citations (1)
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102807849A (en) * | 2012-04-06 | 2012-12-05 | 中国石油大学(华东) | Gel plugging agent for deep profile control of higher temperature oil reservoir and preparation method of gel plugging agent |
| CN102807849B (en) * | 2012-04-06 | 2014-02-19 | 中国石油大学(华东) | Gel plugging agent for deep profile control of higher temperature oil reservoir and preparation method of gel plugging agent |
| CN104152123A (en) * | 2013-05-13 | 2014-11-19 | 中国石油化工股份有限公司 | Cationic chemical plugging agent and preparation method thereof |
| CN103408703A (en) * | 2013-08-06 | 2013-11-27 | 西安石油大学 | Liquid polymeric microspheres and synthetic method thereof |
| CN106634906A (en) * | 2016-09-18 | 2017-05-10 | 中国石油大学(华东) | Gel with high temperature resistance |
| CN106753297A (en) * | 2016-11-16 | 2017-05-31 | 中国海洋石油总公司 | A kind of anti-salt type polymer gel profile control agent |
| CN110144200A (en) * | 2019-06-14 | 2019-08-20 | 黑龙江益瑞化工有限公司 | A kind of oilfield chemistry oil recovery copolymer elastic gel class profile control agent |
| CN110144200B (en) * | 2019-06-14 | 2020-07-03 | 黑龙江益瑞化工有限公司 | Copolymer elastic gel profile control agent for oilfield chemical oil extraction |
| CN110205107A (en) * | 2019-06-21 | 2019-09-06 | 黑龙江益瑞化工有限公司 | A kind of oilfield chemistry oil recovery compound ion class water plugging profile control agent and preparation method thereof |
| CN114106799A (en) * | 2020-08-26 | 2022-03-01 | 中国海洋石油集团有限公司 | Bisphenol S and hexamethylenetetramine cross-linked high-temperature-resistant gel plugging agent |
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Application publication date: 20101124 |