CN100485159C - Air well single-way closing agent and its formulating method - Google Patents
Air well single-way closing agent and its formulating method Download PDFInfo
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- CN100485159C CN100485159C CNB2005100423543A CN200510042354A CN100485159C CN 100485159 C CN100485159 C CN 100485159C CN B2005100423543 A CNB2005100423543 A CN B2005100423543A CN 200510042354 A CN200510042354 A CN 200510042354A CN 100485159 C CN100485159 C CN 100485159C
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Abstract
A monodirectional plugging agent for gas well is prepared from acrylamide, cross-linking agent (divinylbenzene), filler (bentone), hydrolyzing agent (Na2CO3), inhibitor (CaCl2), deoxidizing agent (sodium thiosulfate) and thermal stabilizer (O-phenyldiamine). Its preparing process is also disclosed. It features that it can become elastic particles after the water is absorbed by it.
Description
(1) technical field
The present invention relates to used the blocking temporarily that tap natural gas and close material from well, particularly is air well single-way sealer and compound method thereof.
(2) background technology
In gas exploitation course, along with the increase of natural gas produced quantity, down-hole gas-bearing formation energy is more and more lower, and the pressure coefficient that has is reduced to 0.1～0.2.This subnormal pressure gas well is in maintenance process, and the injury of missing gas-bearing formation because of entry well fluid is insoluble problem.Low-pressure gas well prevents that the method for entry well fluid leakage from mainly containing milk of lime plugging method, grout off method and similar other method at present.All need to remove obstruction after these method constructions are finished, and can't thoroughly remove obstruction, thereby make the original reduction of gas well PR after the maintenance a lot of with the method for acidifying.The unidirectional blocking technology is the natural gas well new repairing technology that grows up recent years, and it has protection gas-bearing formation, legibility and stops up, do not reduce advantages such as gas production, construction technology are simple.Therefore, also come out one after another with the supporting unidirectional blocking agent material of new unidirectional blocking technology.By retrieval, existing more than the ten piece of patent documentation of down-hole sealing agent, diverting agent, sealer that is used for oil-gas mining, wherein " liquid gum plug packing agent " (97118989), " agent of high temperature resistance completion temporary blocking " (90102233), " Temperarily blocking agent for water soluble stratum and preparation method thereof " (91101010), can be used as weak relevant documents of the present invention, but its compositing formula and preparation method are significantly different with the present invention.
(3) summary of the invention
Another application for a patent for invention " low-pressure gas well unidirectional blocking induced flow technical method " that the objective of the invention is for us provides supporting air well single-way sealer material.
This air well single-way sealer, its raw material components is: hydrophilic high mol monomer, initator, crosslinking agent, filler, hydrolytic reagent or grafting agent, inhibitor, oxygen scavenger and heat stabilizer.Hydrophilic high mol monomer is wherein selected acrylamide for use.Initator wherein is made into by potassium peroxydisulfate and sodium hydrogensulfite, and the weight ratio of the two is 3:2.Crosslinking agent is wherein selected divinylbenzene for use.Filler is wherein selected swell soil for use.Hydrolytic reagent is wherein selected Na for use
2CO
3Grafting agent is wherein selected sodium hydroxymethane sulfonate for use.Inhibitor is wherein selected CaCl for use
2Oxygen scavenger is wherein selected sodium thiosulfate for use.Heat stabilizer is wherein selected o-phenylenediamine for use.
The compound method of above-mentioned air well single-way sealer is: drop into hydrophilic high mol monomer acrylamide, crosslinking agent divinylbenzene, hydrolytic reagent Na earlier in reactor
2CO
3Or grafting agent sodium hydroxymethane sulfonate.Under stirring, brute force drops into the filler swell soil gradually.Heat temperature raising to 40 ℃ then.Inflated with nitrogen deoxygenation 30 minutes adds initiator potassium persulfate and sodium sulfite polymerization.Treat polymerization after 120 minutes, be heated to 85 ℃ of constant temperature 8 hours.With the oven dry of the colloid product granulation after the heating, oven dry back particle becomes dry powder, adds inhibitor C aCL again
2, oxygen scavenger sodium thiosulfate, heat stabilizer o-phenylenediamine, and stir infiltration and be finished product in 120 minutes.
The present invention and prior art contrast major advantage are: temperature is below 145 ℃, and pressure reduction is under the 40MPa situation, can absorb the water about 10 times.Can become high strength, heatproof, salt tolerant, measuring body elastic granule after the suction., under the rolling action of big discharge capacity chemical agent and water, this sealer is pumped in the reservoir of gas-bearing formation band in debt or crack and microcrack with high-pressure pump.Be detained between the shaft bottom at the producing zone top above 50m in circle then, form complete unidirectional blocking system.When oppositely pressure reduction is 0.5MPa, just can split away off, all take ground out of by flushing fluid from the gas-bearing formation surface.Thereby solved gas-bearing formation by entry well fluid problem that injures and the pollution problem of adopting other temporary plugging technique to gas-bearing formation, also solved the difficult problem of many gas-bearing formations, inhomogeneous formation, large span, sidetracked hole, horizontal well job execution.Can guarantee still to give stable high yields irrespective of drought or water logging behind the gas well maintenance construction.
(4) description of drawings
Accompanying drawing is the compound method process flow chart of air well single-way sealer of the present invention.
(5) specific embodiment
The air well single-way sealer, its raw material components is: hydrophilic high mol monomer, initator, crosslinking agent, filler, hydrolytic reagent or grafting agent, inhibitor, oxygen scavenger and heat stabilizer.Hydrophilic high mol monomer is wherein selected acrylamide for use, and initator is made into by potassium peroxydisulfate and the sodium sulfite weight ratio by 3:2, and crosslinking agent is selected divinylbenzene for use, and filler is selected swell soil for use, and hydrolytic reagent is selected Na for use
2CO
3, grafting agent is selected the hydroxyl methanesulfonic sodium for use, and inhibitor is selected CaCL for use
2, oxygen scavenger is selected sodium thiosulfate for use, and heat stabilizer is selected o-phenylenediamine for use.
The compound method embodiment of above-mentioned air well single-way sealer is as shown in drawings:
The first step is earlier made the monomer acrylamide concentration and is 20～22% the aqueous solution, and takes by weighing this aqueous solution 6000g, crosslinking agent divinylbenzene 2g, hydrolytic reagent Na
2CO
3300g, filler swell soil 300g.Then first three is planted composition and drop in the reactor, carry out brute force and stirred 60 minutes, in whipping process, drop into swell soil gradually.
Second step, heat temperature raising to 40 ℃.
The 3rd step, inflated with nitrogen deoxygenation 30 minutes.
In the 4th step, add initator polymerization 120 minutes.Initator is made into by potassium peroxydisulfate and the sodium sulfite weight ratio by 3:2, and its consumption is 5/10000ths of a monomer acrylamide active ingredient.
In the 5th step, be heated to 85 ℃, constant temperature 8 hours.
The 6th step, the colloid product that heated is cut into 0.5～1.0mm particle, obtain about 2000g dry powder after the oven dry.
In the 7th step, in above-mentioned dry powder, add inhibitor C aCl
2200g, oxygen scavenger sodium thiosulfate 10g, heat stabilizer o-phenylenediamine 200g stir infiltration 120 minutes, are finished product.
Aforementioned dosage " g " also can be used " part ", and every " part " is that what " g " can what be set according to amount of preparation.
Application example: a bite low-pressure gas well is arranged, and used unidirectional blocking liquid is that 5% unidirectional blocking agent and working concentration are that 3% PDDA is formulated by working concentration.Used well killing fluid is that 1% OP-10 surfactant (claiming alkyl polyoxyethylene ether again) and working concentration are that 1.5% PDDA is formulated by working concentration.By this unidirectional blocking liquid and well killing fluid the two to form pressure reduction be the working solution system that 35MPa does not miss.Reached the good result of above-mentioned expection.
Claims (2)
1. air well single-way sealer, it is characterized in that raw material components is: hydrophilic high mol monomer, initator, crosslinking agent, filler, hydrolytic reagent or grafting agent, inhibitor, oxygen scavenger and heat stabilizer, hydrophilic high mol monomer is wherein selected acrylamide for use, initator is made into by potassium peroxydisulfate and the sodium sulfite weight ratio by 3: 2, crosslinking agent is selected divinylbenzene for use, filler is selected swell soil for use, and hydrolytic reagent is selected Na for use
2CO
3, grafting agent is selected sodium hydroxymethane sulfonate for use, and inhibitor is selected CaCL for use
2, oxygen scavenger is selected sodium thiosulfate for use, and heat stabilizer is selected o-phenylenediamine for use.
2. the compound method of air well single-way sealer according to claim 1 is characterized in that dropping into earlier hydrophilic high mol monomer acrylamide, crosslinking agent divinylbenzene, hydrolytic reagent Na in reactor
2CO
3Or grafting agent sodium hydroxymethane sulfonate, under stirring, brute force drops into the filler swell soil gradually, heat temperature raising to 40 ℃ then, inflated with nitrogen deoxygenation 30 minutes adds initator POTASSIUM PERSULFATE and sodium sulfite polymerization, treats that polymerization is after 120 minutes, be heated to 85 ℃ of constant temperature 8 hours, with the oven dry of the colloid product granulation after the heating, oven dry back particle becomes dry powder, adds inhibitor C aCL again
2, oxygen scavenger sodium thiosulfate, heat stabilizer o-phenylenediamine, and stir infiltration and be finished product in 120 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100423543A CN100485159C (en) | 2005-01-18 | 2005-01-18 | Air well single-way closing agent and its formulating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100423543A CN100485159C (en) | 2005-01-18 | 2005-01-18 | Air well single-way closing agent and its formulating method |
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| Publication Number | Publication Date |
|---|---|
| CN1644872A CN1644872A (en) | 2005-07-27 |
| CN100485159C true CN100485159C (en) | 2009-05-06 |
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| CNB2005100423543A Expired - Fee Related CN100485159C (en) | 2005-01-18 | 2005-01-18 | Air well single-way closing agent and its formulating method |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2485158C2 (en) * | 2010-07-30 | 2013-06-20 | Республиканское Унитарное Предприятие "Производственное Объединение "Белоруснефть" | Method for obtaining acrylic reagent to restrict water influx to oil well |
| CN102559160B (en) * | 2011-12-26 | 2013-10-16 | 胜利油田方圆化工有限公司 | Unidirectional temporary plugging agent for natural gas wells and application method thereof |
| CN104060261B (en) * | 2014-05-26 | 2016-08-24 | 安徽红桥金属制造有限公司 | A kind of zinc-plated sealer and preparation method thereof |
| CN105112027A (en) * | 2015-09-10 | 2015-12-02 | 安徽陆海石油助剂科技有限公司 | Non-permeability slurry treating agent |
| CN107936174B (en) * | 2017-12-13 | 2020-01-17 | 胜利油田方圆化工有限公司 | High-temperature-resistant resistance-reducing polymer for fracturing and preparation method and application method thereof |
| CN109735315B (en) * | 2018-12-22 | 2021-06-11 | 东营方立化工有限公司 | Environment-friendly delayed crosslinking profile control agent for oil extraction and preparation method and application thereof |
| CN110627990A (en) * | 2019-09-25 | 2019-12-31 | 九江智达环能科技有限公司 | Degradable liquid cross-linked plugging material and preparation method and application thereof |
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| CN1644872A (en) | 2005-07-27 |
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Granted publication date: 20090506 Termination date: 20100219 |