CN103409131A - Swelled-clay shrinking agent for plug removal, and preparation method and application thereof - Google Patents
Swelled-clay shrinking agent for plug removal, and preparation method and application thereof Download PDFInfo
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- CN103409131A CN103409131A CN2013103542604A CN201310354260A CN103409131A CN 103409131 A CN103409131 A CN 103409131A CN 2013103542604 A CN2013103542604 A CN 2013103542604A CN 201310354260 A CN201310354260 A CN 201310354260A CN 103409131 A CN103409131 A CN 103409131A
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- clay
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- swollen dose
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Abstract
The invention provides a swelled-clay shrinking agent for plug removal. The swelled-clay shrinking agent is prepared through compounding of poly(dimethyl diallyl ammonium chloride), potassium chloride and ammonium chloride. The invention has the following beneficial effects: the swelled-clay shrinking agent aims to overcome the technical problems of low porosity of an oil reservoir, low permeability, high content of clay cement, difficult water injection and poor effects of conventional technical measures like augmented injection, the crux of the problems is found out, and the crux is that infiltration capacity of an oil reservoir deteriorates, or even disappears, because clay minerals in a stratum swell when encountering injected surface water and dispersion and migration lead to obstruction of gaps in the oil reservoir. According to the invention, overcoming of clay swelling is given priority, and the chemical agent capable of shrinking the volume of swelled clay and restoring filtration capacity of an oil reservoir is compounded; and the invention provides a preparation method for the swelled-clay shrinking agent and an application method for the swelled-clay shrinking agent in on-site removal of obstruction of a stratum.
Description
Technical field
Present technique relates to the novel material application that a kind of oil and water well is removed reservoir choke, it is by suppressing clay swelling, stablize clay particle, stop the clay dispersion migration, the water molecules that the clay expanded adsorbs is broken away from, the astringent clay expanding volume, recover blocked formation void, removes thereby reach the purpose that reservoir choke is polluted.
Background technology
In order to improve the recovery ratio in oil field, generally adopt waterflooding program.Water injection well, along with the prolongation of water injection time and the increase of accumulative total water injection rate, the phenomenon that injection pressure raises gradually and water injection rate descends generally all can occur; And oil well can engender that along with the passing of production time production fluid amount and oil offtake descend and the moisture phenomenon risen gradually.The factor more complicated that this phenomenon occurs, main factor have following four kinds:
The one, the impact of injecting water quality: although injected water is through pre-treatment, but still contain mechanical impurity (≤2mg/L), iron (≤0.5mg/L), oxygen (≤0.5mg/L) and saprophytic microorganism, iron bacteria, sulphate reducing bacteria etc., in the injected water course of conveying, also can produce erosion and incrustation scale, these materials can result in blockage to the oil reservoir space;
The 2nd, the contamination and plugging that the impurity while carrying out borehole operation in operation liquid forms;
The 3rd, in the injecting process, formation temperature reduces, and wax, colloid, bituminous matter in stratum in residual crude oil are condensed to form and stopped up;
The 4th, the cementing matter in stratum mostly is clay, and the salinity of injected water is generally much lower than local water, and the lighter water of clay chance can expand, fragmentation, and clay swelling diminishes stratum pore throat diameter, and broken fine migration can form obstruction again;
Remove reservoir choke and pollute the general acid treatment of adopting, can remove most tampers.But it is poor for the high stratum of clay content, to carry out acid-treated effect, or even to no effect.Because this principal element of injury that clay swelling forms is not removed in acid treatment.
The Contract expanding and reduce the pressure increase water injection technology is exactly high for Clay Mineral content, and water-sensitive expands, fine migration forms reservoir choke and a kind of new technology of researching and developing.It is to integrate to eliminate the Technology that contaminating impurity stops up, suppresses clay swelling, stablizes clay particle, stops the clay dispersion migration, the clay expanded is shunk.This technology can be applied to equally oil well and remove the reservoir choke pollution simultaneously, plays the purpose of steady oil volume increase.
Summary of the invention
Suppress clay swelling, stablize clay particle, stop the clay dispersion migration, the water molecules that the clay expanded adsorbs is broken away from, the astringent clay expanding volume, recover blocked formation void, thereby reach the purpose of step-down augmented injection.
To achieve these goals, the invention provides a kind of de-plugging with swollen dose of contracting, is to carry out composite making by Poly Dimethyl Diallyl Ammonium Chloride, Repone K, ammonium chloride.
Further, above-mentioned de-plugging is added to the water swollen dose of compound of contracting according to said sequence by the preparation method of swollen dose of contracting successively with swollen dose of contracting, described de-plugging, after rapid stirring 15-20min fully dissolves it, and the 200kg plastic tank of packing into sealing.
Further, above-mentioned de-plugging is with contracting swollen dose, and described de-plugging is with in swollen dose of contracting, and the add-on of Poly Dimethyl Diallyl Ammonium Chloride, Repone K, ammonium chloride and water is is 1:0.5:0.5:5 according to mass ratio.
Another object of the present invention is to provide swollen dose of application in the well de-plugging of this contracting.
Further, above-mentioned de-plugging, with swollen dose of application in the water injection well de-plugging of contracting, is to be used in conjunction with acid solution.
Further, above-mentioned de-plugging swollen dose of application in the water injection well de-plugging of contracting, effectively working concentration is percentage mass ratio 5%.
Further, above-mentioned de-plugging swollen dose of application in the water injection well de-plugging of contracting, described acid solution is one or more in hydrochloric acid, hydrofluoric acid, mud acid, citric acid or many hydracids.
Wherein this described de-plugging by the working conditions of swollen dose of contracting is:
(1) the wellblock clay content is higher, is the water injection well of water-sensitive, fast quick characteristic;
(2) in order, there is the water injection well of Final pollution in the initial stage water filling;
(3) the poor water injection well of acidizing effect;
(4) oil and water well is corresponding is communicated with better, annotates and adopts significant reaction;
(5) hole condition is good, becomes, overlaps and leak without cover.
Wherein this described de-plugging swollen dose of application in the water injection well de-plugging of contracting, it is characterized in that: with acid solution (hydrochloric acid, hydrofluoric acid, mud acid, one or more in citric acid or many hydracids), be used in conjunction with, the working concentration that this contracting is swollen dose is effective percentage mass ratio 5%.
The beneficial effect of present technique is that Contract expanding and reduce the pressure Technology core is to shrink the clay mineral volume of water-swellable, the percolation ability of renwing stratum.This technology has been captured the difficult problem of low porosity, low permeability, reservoir augmented injection that clay content is high, has formed a new augmented injection process technology, and the getting well of efficient high, effect listed in row before the every well stimulation in oil field.Its technique is simple, easy construction, ample supply and prompt delivery, does not need to increase the new device new installation, has high application value.
The accompanying drawing explanation
Fig. 1 tells in embodiment 1 to breathe out oil field S111 well water injection curve schematic diagram.
Embodiment
Embodiment 1:
The field conduct example:
Take to tell and breathe out oil field S111 well and be example, this well is a bite water injection well, and this well is through acidification to dispel block repeatedly, obtained certain augmented injection effect, but validity period is shorter, this well water amount does not reach the injection allocation requirement at present, the acidifying validity period finishes in advance, so oil recovery factory's chamber determines the acidifying augmented injection again of this well.As shown in table 1 is S111 well oil reservoir clay mineral relative content, and as shown in table 2 is S111 well reservoir sensitivity evaluation.
For above situation, determine that the acid formula that this acidifying augmented injection is used is after analyzing the reservoir properties feature of this well:
Preposition acid:
The steady agent 1%+ of hydrochloric acid 6%+ phosphoric acid ester mixture 2%+ iron inhibiter 1%+ expansion-resisting agent 2%;
Oxidation solution:
Concentration is 0.4% stable chlorine dioxide solution;
Main acid:
The hydrochloric acid 5%+ phosphoric acid ester mixture 5%+ ammonium bifluoride 7%+ swollen dose of steady agent 1%+ of the 5%+ iron inhibiter 1% that contract;
Rearmounted acid:
The steady agent 2%+ of hydrochloric acid 6%+ iron inhibiter 1%+ expansion-resisting agent 1%;
August 21 in 2011 implemented de-plugging step-down augmented injection construction by this well, the front water injection pressure 27MPa that constructs, injection allocation amount 40m
3/ d, day fluence 30m
3/ d, water injection pressure 24MPa after enforcement step-down augmented injection, day fluence 53 m
3/ d.End on October 28th, 2011, this well water injection pressure 24MPa, daily water-injection rate 40 m
3/ d, remain valid, and validity period reaches 68 days.Be illustrated in figure 1 S111 well water injection curve figure.
Claims (7)
1. a de-plugging, with swollen dose of contracting, is characterized in that: be to carry out composite making by Poly Dimethyl Diallyl Ammonium Chloride, Repone K, ammonium chloride.
2. de-plugging as claimed in claim 1 is with contracting swollen dose, it is characterized in that, described de-plugging is added to the water swollen dose of compound of contracting according to said sequence successively by the preparation method of swollen dose of contracting, after rapid stirring 15-20min fully dissolves it, and the 200kg plastic tank of packing into sealing.
3. de-plugging as claimed in claim 1 or 2, with contracting swollen dose, is characterized in that: described de-plugging is with in swollen dose of contracting, and the add-on of Poly Dimethyl Diallyl Ammonium Chloride, Repone K, ammonium chloride and water is is 1:0.5:0.5:5 according to mass ratio.
4. de-plugging as claimed in claim 1 swollen dose of application in the water injection well de-plugging of contracting.
5. de-plugging, with swollen dose of application in the water injection well de-plugging of contracting, is characterized in that: be used in conjunction with acid solution as claimed in claim 4.
As de-plugging as described in claim 4 or 5 with swollen dose of contracting in the application in the water injection well de-plugging, it is characterized in that: effectively working concentration is percentage mass ratio 5%.
7. de-plugging as claimed in claim 6 is with contracting swollen dose in the application in the water injection well de-plugging, and it is characterized in that: described acid solution is one or more in hydrochloric acid, hydrofluoric acid, mud acid, citric acid or many hydracids.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103542604A CN103409131A (en) | 2013-08-15 | 2013-08-15 | Swelled-clay shrinking agent for plug removal, and preparation method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103542604A CN103409131A (en) | 2013-08-15 | 2013-08-15 | Swelled-clay shrinking agent for plug removal, and preparation method and application thereof |
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| CN103409131A true CN103409131A (en) | 2013-11-27 |
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| CN2013103542604A Pending CN103409131A (en) | 2013-08-15 | 2013-08-15 | Swelled-clay shrinking agent for plug removal, and preparation method and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105623636A (en) * | 2014-10-27 | 2016-06-01 | 中国石油天然气股份有限公司 | Anti-swelling swelling-shrinkage agent, and preparation method and application thereof |
| CN113355060A (en) * | 2021-05-28 | 2021-09-07 | 浙江大川新材料股份有限公司 | Novel clay stabilizer and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101362937A (en) * | 2008-09-26 | 2009-02-11 | 大庆石油管理局 | Adsorption inhibitor applying to low permeable oilfield |
| US20100210484A1 (en) * | 2005-06-24 | 2010-08-19 | Innovative Chemical Technologies Canada Ltd. | Clay control additive for wellbore fluids |
| CN102391853A (en) * | 2011-10-08 | 2012-03-28 | 西安长庆化工集团有限公司 | Swelling-resistant shrinking and swelling agent and preparation method thereof |
-
2013
- 2013-08-15 CN CN2013103542604A patent/CN103409131A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100210484A1 (en) * | 2005-06-24 | 2010-08-19 | Innovative Chemical Technologies Canada Ltd. | Clay control additive for wellbore fluids |
| CN101362937A (en) * | 2008-09-26 | 2009-02-11 | 大庆石油管理局 | Adsorption inhibitor applying to low permeable oilfield |
| CN102391853A (en) * | 2011-10-08 | 2012-03-28 | 西安长庆化工集团有限公司 | Swelling-resistant shrinking and swelling agent and preparation method thereof |
Non-Patent Citations (4)
| Title |
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| 崔朝轩等: "粘土缩膨解堵工艺技术", 《内蒙古石油化工》 * |
| 李斯迈等: "可开发作高效有机缩膨剂的化合物探讨", 《油田化学》 * |
| 李斯迈等: "可开发作高效有机缩膨剂的化合物探讨", 《油田化学》, vol. 26, no. 3, 25 September 2009 (2009-09-25), pages 276 - 281 * |
| 游支云等: "PDMDAAC粘土防膨剂的合成与评价", 《石油天然气学报（江汉石油学院学报）》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105623636A (en) * | 2014-10-27 | 2016-06-01 | 中国石油天然气股份有限公司 | Anti-swelling swelling-shrinkage agent, and preparation method and application thereof |
| CN105623636B (en) * | 2014-10-27 | 2019-05-07 | 中国石油天然气股份有限公司 | Swelling-resistant shrinking and swelling agent, preparation method and its application |
| CN113355060A (en) * | 2021-05-28 | 2021-09-07 | 浙江大川新材料股份有限公司 | Novel clay stabilizer and preparation method thereof |
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Application publication date: 20131127 |