CN102559162B - Leakage-proof type temporary blockage additive for low-pressure thin oil well - Google Patents
Leakage-proof type temporary blockage additive for low-pressure thin oil well Download PDFInfo
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- CN102559162B CN102559162B CN201010586185.0A CN201010586185A CN102559162B CN 102559162 B CN102559162 B CN 102559162B CN 201010586185 A CN201010586185 A CN 201010586185A CN 102559162 B CN102559162 B CN 102559162B
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Abstract
The invention discloses a leakage-proof type temporary blockage additive for a low-pressure thin oil well, which belongs to the field of workover treatment for a thin oil well in petroleum industry. The temporary blockage additive comprise the following raw materials in weight percentage: 0.4-0.6% of hydroxypropyl guar gum, 0.2-0.4% of organic titanium, 5-10% of petroleum resin, 0.3-0.5% of dodecyl dimethyl betaine, 0.1% of sodium sulfite, 0.02-0.04% of ammonium persulfate and 88.5-93.5% of water. The leakage-proof type temporary blockage additive of the invention crosslinks the hydroxypropyl guar gum with the organic titanium to form a gel system, and at the same time adds a certain amount of petroleum resin to form a compound temporary blockage system. The temporary blockage system can immediately break gel without blocking off the oil well, and avoids the accident of stuck pump caused by broken gel fragment. In addition, the leakage-proof type temporary blockage additive has the advantages of no pollution, no harm to a reservoir and low cost.
Description
Technical field
The present invention relates to petroleum industry thin oil well workover treatment field, the leakage-proof type temporary blockage additive that particularly a kind of low-pressure thin oil well is used.
Background technology
In low-pressure thin oil well mining operations; due to long-term exploitation, can there is deficit to a certain degree in stratum, thereby in operation and washing well process; well control fluid, flushing fluid can enter reservoir in a large number, so in low-pressure thin oil well mining operations, usually there will be the serious problem of leakage.Well control fluid, flushing fluid enter after reservoir, easily make clay mineral hydration swelling, cause reservoir water sensitive damage, cause reservoir permeability to decline, and cause discharge opeing difficulty, thereby need to block up temporarily before low-pressure thin oil well workover treatment and well-flushing.
At present, the temporary plugging agent using in workover treatment process is mainly two classes, and a class is the temporary plugging agent of polyacrylamide gel system type, and this type temporary plugging agent has stronger sealing characteristics, has and falls preferably leak-off effect, uses more extensive in oil well repairing operation; Another kind of is oily molten type temporary plugging agent, after this type temporary plugging agent shutoff, under reservoir temperature, can by oil, be dissolved and automatically terminate shutoff, and be a kind of free of contamination temporary plugging agent.
In realizing process of the present invention, contriver finds that prior art at least exists following problem: the temporary plugging agent of polyacrylamide gel system type is difficult for degraded, destroys, in thin oil well operation, very easily damage stratum, cause permeability plugging, cause production fluid amount to reduce, even well is blocked, and polyacrylamide gel is sheared very easily holddown of fragment, affects the normal production of oil well; Oily molten type temporary plugging agent price is more expensive, and consumption great Yi is dead by well, and consumption is little, does not have stifled effect temporarily, and field conduct difficulty is larger, only limits in stratum deficit not quite, and uses in LOW PERMEABILITY RESERVOIR.
Summary of the invention
The object of the embodiment of the present invention is the defect for above-mentioned prior art, a kind of leakage-proof type temporary blockage additive for low-pressure thin oil well is provided, by hydroxypropylguar gum and organic titanium are cross-linked to form to gelling system, add a certain amount of petroleum resin simultaneously and form Complex Temporary Blocking system, this temporarily stifled system can be broken glue immediately, oil well can not blocked, and broken glue fragment can not cause holddown accident, have simultaneously pollution-free, to reservoir without injury, advantage with low cost.
The technical scheme that the present invention takes is to achieve these goals:
A leakage-proof type temporary blockage additive for low-pressure thin oil well, raw materials used by following weight percent proportioning: hydroxypropylguar gum 0.4-0.6%, organic titanium 0.2-0.4%, petroleum resin 5-10%, Varion CDG-K 0.3-0.5%, S-WAT 0.1%, ammonium persulphate 0.02-0.04% and water 88.5-93.5%.
Described hydroxypropylguar gum is selected first grade or seconds.
Described petroleum resin are selected No. 6 or No. 9.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is: by hydroxypropylguar gum and organic titanium are cross-linked to form to gelling system, add a certain amount of petroleum resin simultaneously and form Complex Temporary Blocking system, described gelling system belongs to non-rigid structure, easily by bacterium and ammonium persulphate, destroyed, petroleum resin are easily dissolved by thin oil, thereby this temporarily stifled system can be broken glue immediately, oil well can not blocked, and broken glue fragment can not cause holddown accident, have simultaneously pollution-free, to reservoir without injury, advantage with low cost.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Embodiment 1
The present embodiment provides a kind of leakage-proof type temporary blockage additive for low-pressure thin oil well.
Temporary plugging agent composition of raw materials:
Hydroxypropylguar gum 0.04-0.06 ton, organic titanium 0.02-0.04 ton, petroleum resin 0.5-1 ton, Varion CDG-K 0.03-0.05 ton, 0.01 ton of S-WAT, ammonium persulphate 0.002-0.004 ton and water 8.85-9.35 ton.
In the leakage-proof type temporary blockage additive for low-pressure thin oil well that the present embodiment provides, the effect of main component is as follows:
Hydroxypropylguar gum and organic titanium are cross-linked to form gelling system, the embodiment of the present invention selects hydroxypropylguar gum to be because compare with other plant glue, as sesbania gum, hydroxypropylguar gum and organic titanium are crosslinked more thorough, and crosslinking reaction can reach rapidly completely, thereby described gelling system gelation time is shorter, is generally 30min, can meet site operation needs, and gelation time can be cross-linked concentration adjustment by organic titanium; Plastic temperature is about 50 ℃, and when system temperature reaches 50 ℃, it is the strongest that gel reaches; The sealing ratiod of described gelling system is not less than 95%, and described gelling system is shutoff immediate vicinity of wellbore reservoir pore space effectively.
Petroleum resin have good oil soluble energy, the leakage-proof type temporary blockage additive for low-pressure thin oil well PetroChina Company Limited. resin particle providing at the present embodiment plays a supportive role, make described temporary plugging agent ultimate compression strength higher, and, under reservoir temperature, owing to there being the existence of described gelling system, in gel, there is resin, in resin, there is gel, after the broken glue of gel, can form duct, thin oil flows out with duct, flow out thin oil dissolving resin, increase duct, thereby releasing shutoff, petroleum resin can be not dead by well, petroleum resin can be dissolved by thin oil, and automatically terminate the shutoff of petroleum resin to reservoir, petroleum resin are other oil soluble polymers relatively, and softening temperature is higher, and petroleum resin softening temperature is generally greater than 60 ℃, and intensity is larger, and price is cheaper, is more suitable for temporary plugging agent, petroleum resin are combined effectively shutoff immediate vicinity of wellbore macropore path with described gelling system, during for low-pressure thin oil well operations and well-washing wax-cleaning operation, prevent that well control fluid, lost circulation stratum from providing preferably stifled effect temporarily.
The Varion CDG-K adding in described temporary plugging agent plays the effect of coupling agent, Varion CDG-K can be adsorbed on petroleum resin surface, wet by the wet water that is reversed to of oil in its surface, thereby guarantee that petroleum resin and described gelling system have better interface compatibility, can strengthen the bearing capacity of described temporarily stifled system.
In described temporary plugging agent, add after described S-WAT, the resistance to shear ability of heatproof significantly improves, at 80 ℃ of temperature, shearing rate 170s
-1under, the resistance to shear ability of heatproof was brought up to more than 2 hours by 50 minutes.
Described gelling system can constantly break glue under the effect of ammonium persulphate, the conventionally broken glue time is 4h, the broken glue time can be according to reservoir temperature by regulating the consumption of ammonium sulfate to regulate, if the broken glue time needs 2-3 days, in system, do not add ammonium persulphate, rely on shaft bottom bacterium can break glue completely, described gelling system has the effect of instant broken glue, shorten the discharge opeing phase, recovered rapidly oil well productivity.
During leakage-proof type temporary blockage additive for low-pressure thin oil well rig-site utilization that the present embodiment provides, first hydroxypropylguar gum 0.04-0.06 ton, petroleum resin 0.5-1 ton, Varion CDG-K 0.03-0.05 ton, 0.01 ton of S-WAT, ammonium persulphate 0.002-0.004 ton and water 8.85-9.35 ton are mixed with to composite base liquid system, at the bottom of adding 0.02-0.04 ton organic titanium cross-linking agent can pump into band well in operation while implementing at the scene, then implement operation.
The leakage-proof type temporary blockage additive for low-pressure thin oil well that the present embodiment provides is by being cross-linked to form gelling system by hydroxypropylguar gum and organic titanium, add a certain amount of petroleum resin simultaneously and form Complex Temporary Blocking system, described gelling system belongs to non-rigid structure, easily by bacterium and ammonium persulphate, destroyed, petroleum resin are easily dissolved by thin oil, thereby this temporarily stifled system can be broken glue immediately, oil well can not blocked, and broken glue fragment can not cause holddown accident, have simultaneously pollution-free, to reservoir without injury, advantage with low cost.
In order to make hydroxypropylguar gum and organic titanium crosslinked more thorough, hydroxypropylguar gum is selected first grade or seconds; Because the molten rate of No. 6 or 9 petroleum resin oil is all greater than 95%, can better guarantee broken that the glue time is short, the petroleum resin of the present embodiment use are No. 6 or No. 9 petroleum resin; The content that in the present embodiment, ammonium persulphate, Varion CDG-K, S-WAT are purchase is not less than 90% finished product.
Embodiment 2
Temporary plugging agent composition of raw materials:
44.25 tons, 0.2 ton of hydroxypropylguar gum, 0.1 ton of organic titanium, 2.5 tons of petroleum resin, 0.15 ton of Varion CDG-K, 0.05 ton of S-WAT, 0.01 ton of ammonium persulphate and water.
There are 6 gas-bearing formations 10-4 well current productive zone position in Hainan, and rate of permeation is all 1000 * 10
-3μ m
2above, principal permeability is 3028.1 * 10
-3μ m
2, well-flushing time leakage is in the past very serious, when heat is washed, substantially loses and returns liquid, and well-flushing finishes rear casing pressure still for negative; During operation well-flushing, once well-flushing 10 car 150 sides loseed and returned liquid.On June 4th, 2009, use described temporary plugging agent to block up temporarily, clamp-on temporary plugging agent 45 sides, then with clear water, replace, pressure plays 2.0MPa, starts normal well-flushing, and heat is washed 50 sides, returns liquid 50 sides.After operation, only three days discharge opeing phase, output before oil well all resumes operation, and after operation, there is not broken glue fragment holddown accident, and not use before described temporary plugging agent, after operation, the discharge opeing phase all, about one month, has a strong impact on oil well output.
Embodiment 3
Temporary plugging agent composition of raw materials:
45 tons, 0.24 ton of hydroxypropylguar gum, 0.12 ton of organic titanium, 3 tons of petroleum resin, 0.18 ton of Varion CDG-K, 0.048 ton of S-WAT, 0.012 ton of ammonium persulphate and water.
Hainan 19-9 well is well-flushing 30 cars when the end of the year 2008 overhauls, totally 450 sides do not return liquid, before sand washing operation on October 12 in 2009, use described temporary plugging agent to block up temporarily, clamp-on temporary plugging agent 50 sides, pressure plays 6.0MPa, reach sand washing pressure requirement, after operation, this well array liquid was shown in oil after 3 days, discharge opeing finishes within latter 2 days, just to have reached the production level before operation, and this well production status is good at present.After operation, do not occur broken glue fragment holddown accident, do not use before described temporary plugging agent, cannot carry out normal sand washing operation, the discharge opeing phase all, about one month, has a strong impact on oil well output.
Embodiment 4
Temporary plugging agent composition of raw materials:
46.75 tons, 0.3 ton of hydroxypropylguar gum, 0.2 ton of organic titanium, 5 tons of petroleum resin, 0.25 ton of Varion CDG-K, 0.05 ton of S-WAT, 0.002 ton of ammonium persulphate and water.
Hainan 25-17 well is when the end of the year 2008, heat was washed, well-flushing 3 cars, totally 45 sides do not return liquid, for the phenomenon that prevents from again occurring that well-flushing does not return, before on September 9th, 2009, heat was washed operation, use described temporary plugging agent to block up temporarily, clamp-on temporary plugging agent 45 sides, replace clear water 30 sides to oil reservoir, after wellhead pressure plays 1.0MPa, normal well-flushing circulates, wash 40 sides, return 40 sides.After operation, only three days discharge opeing phase, output before oil well all resumes operation, and after operation, there is not broken glue fragment holddown accident, and not use before described temporary plugging agent, after operation, the discharge opeing phase all, about one month, has a strong impact on oil well output.
As can be seen here, the leakage-proof type temporary blockage additive for low-pressure thin oil well that the embodiment of the present invention provides is that a kind of to have sealing characteristics stronger, easily degraded, and broken glue, without injury, pollution-free to reservoir immediately, and have certain oil-soluble temporary plugging agent.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. a leakage-proof type temporary blockage additive for low-pressure thin oil well, it is characterized in that, raw materials used by following weight percent proportioning: hydroxypropylguar gum 0.4-0.6%, organic titanium 0.2-0.4%, petroleum resin 5-10%, Varion CDG-K 0.3-0.5%, S-WAT 0.1%, ammonium persulphate 0.02-0.04% and water 88.5-93.5%, the finished product that described Varion CDG-K is content >=90%.
2. leakage-proof type temporary blockage additive for low-pressure thin oil well according to claim 1, is characterized in that, described hydroxypropylguar gum is selected first grade or seconds.
3. leakage-proof type temporary blockage additive for low-pressure thin oil well according to claim 1, is characterized in that, described petroleum resin are selected No. 6 or No. 9.
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| CN201010586185.0A CN102559162B (en) | 2010-12-08 | 2010-12-08 | Leakage-proof type temporary blockage additive for low-pressure thin oil well |
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| CN102559162B true CN102559162B (en) | 2014-11-26 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103045212B (en) * | 2013-01-07 | 2015-08-19 | 中国海洋石油总公司 | A kind of Microcapsule guar gum and preparation method thereof |
| CN104357033B (en) * | 2014-11-05 | 2017-03-29 | 成都理工大学 | Blocking agent synergist, the gel containing the blocking agent synergist and preparation method and application |
| CN104449645B (en) * | 2014-11-19 | 2017-08-25 | 中国科学院化学研究所 | Heat-staple aqueous guar glue solution and its preparation method and application |
| GB201511218D0 (en) * | 2015-06-25 | 2015-08-12 | Goe Ip As | Reservoir treatments |
| CN107619659A (en) * | 2016-07-13 | 2018-01-23 | 中国石油天然气股份有限公司 | Low solid phase oil-soluble temporarily blocks up type workover fluid and its preparation method and application |
| CN110484226A (en) * | 2018-05-15 | 2019-11-22 | 中国石油天然气股份有限公司 | Kill-job diverting agent and preparation method thereof |
| CN108795400B (en) * | 2018-06-22 | 2020-10-09 | 中国石油天然气股份有限公司 | High-temperature temporary plugging ball and preparation method and application thereof |
| CN109321220B (en) * | 2018-10-17 | 2021-08-03 | 中国石油天然气股份有限公司 | Plugging agent for adjusting water absorption profile of immobile pipe column of water injection well and water absorption profile adjusting process |
| CN114907824B (en) * | 2021-02-09 | 2024-05-17 | 中国石油化工股份有限公司 | Phase permeation regulator, preparation method and application thereof |
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| CN101353569B (en) * | 2008-09-17 | 2011-06-29 | 西南石油大学 | Controllable cross linked gel water blockage plugging material |
| CN101519585B (en) * | 2009-03-31 | 2011-05-04 | 荆州市弘利化工科技有限公司 | Shearing cross-linking sensitive plugging agent and preparation method thereof |
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| CN1524920A (en) * | 2003-02-28 | 2004-09-01 | 中国石油天然气股份有限公司 | Organic boron delay cross-linking plant adhesive breakdown fluid |
| US7195065B2 (en) * | 2004-08-05 | 2007-03-27 | Baker Hughes Incorporated | Stabilizing crosslinked polymer guars and modified guar derivatives |
| CN101027376A (en) * | 2004-08-05 | 2007-08-29 | 贝克休斯公司 | Stabilizing crosslinked polymer guars and modified guar derivatives |
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