CN1298804C - Hydrophobic water-swelling profile control agent - Google Patents
Hydrophobic water-swelling profile control agent Download PDFInfo
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- CN1298804C CN1298804C CNB2005101129970A CN200510112997A CN1298804C CN 1298804 C CN1298804 C CN 1298804C CN B2005101129970 A CNB2005101129970 A CN B2005101129970A CN 200510112997 A CN200510112997 A CN 200510112997A CN 1298804 C CN1298804 C CN 1298804C
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Abstract
A modifying and flooding agent for water injection well can improve water flooding effect. Is characterized by comprising the following raw materials in percentage by mass: firstly, 40-70% of distilled water; ② 20-50% of acrylamide; ③ 4 to 15 percent of calcium bentonite; 5-10% of alkyl acrylate; sodium persulfate is 0.1-0.5%; 0.1-0.5% of N, N-methylene bisacrylamide. The preparation method comprises the following steps: mixing raw materials: the mixing time is not less than 30 minutes, and the mixing temperature is lower than 35 ℃; polymerization: heating to 70-80 ℃ in a reaction kettle, vacuumizing for 20 minutes, and introducing nitrogen for 1 hour; after the materials are polymerized, keeping the temperature for 12 to 18 hours at 70 to 80 ℃; extruding the water-swelling material out of the reaction kettle and crushing; and fourthly, screening and packaging. The effect is as follows: the hydrophilicity of the water-swelling body is reduced; the valve of the profile control pump is prevented from being blocked; the problem of existing water-swelling settlement is not easy to occur.
Description
Affiliated technical field
The present invention relates to a kind of oilfield chemistry treatment agent, the adjusting driving agnet that particularly a kind of water injection well is used.
Background technology
Most of oil fields of present domestic land enter waterflood stage.Promptly from flatly or many mouthfuls of wells to the stratum water filling, recover the oil from another mouthful or many mouthfuls of wells, water is driven oil and is flowed to producing well, this process is the displacement of reservoir oil.The water that people imagine injection can advance and may many ground the oil in the stratum be driven to producing well equably to flowing all around.And in fact because a variety of causes, injecting water often flows along a certain direction on the stratum, and other direction involve less than, cause waterflooding effect bad.If inject certain material in water injection well, this material can change the original water (flow) direction of injection water in the stratum, so just can improve waterflooding effect.This way is profile control, and the corresponding material that injects is amendment.The material that has profile control and displacement of reservoir oil effect simultaneously is adjusting driving agnet.
Hydroexpanding body is an adjusting driving agnet commonly used at present.Existing hydroexpanding body was dry, hard and crisp irregular particle before being injected into the shaft bottom, granular size at 2mm between the 5mm.Putting into can water-swelling behind the water.In use there is following problem:
(1) because existing hydroexpanding body is hard and crisp particle, stop up the valve of the profile control pump that the profile control operation uses easily, cause often stopping work in the construction and repair pump.
(2) the existing hydroexpanding body water-swelling time is too short.In 45 ℃ of distilled water, just can reach maximum water-swelling multiple within 24 hours.And the profile control operation wishes to be preferably in 48 hours or reach maximum water-swelling multiple after the longer time.
(3) intensity is little after the existing hydroexpanding body water-swelling.Shear strength is mostly less than 1.0KPa after the water-swelling.
The implication of the hydroexpanding body performance perameter that this paper relates to " maximum water-swelling multiple ", " hydroexpanding body intensity ", " water-swelling time " these three parameters is of the same trade known, though none national standard or industry standard are carried out accurate strict definition to these four parameters at present, the standard of different manufacturers is basic identical to the definition and the measuring method of these four parameters.
Summary of the invention
The object of the present invention is to provide a kind of hydrophobic hydroexpanding body regulating-driving agent and preparation method thereof, solve the following problem that existing hydroexpanding body in use exists:
(1) because existing hydroexpanding body is hard and crisp particle, stop up the valve of the profile control pump that the profile control operation uses easily, cause often stopping work in the construction and repair pump.
(2) the existing hydroexpanding body water-swelling time is too short.The water-swelling time was less than 24 hours in 45 ℃ of distilled water.
(3) shear strength is low after the existing hydroexpanding body water-swelling, brings up to 10.0KPa by 1.0KPa.
The object of the present invention is achieved like this:
Hydrophobic type hydroexpanding body of the present invention is compared with existing hydroexpanding body, and difference is the raw material difference, preparation method's difference, just patent protection part.
(1) raw material
During processing raw material, the hydrophobic type hydroexpanding body Duoed the hydrophobic type monomer than existing hydroexpanding body.The hydrophobic type monomer that adopts is an alkyl acrylate.Concrete raw material is formed and is comprised that all raw material total masses of distilled water are 100%, and it is as follows that raw material is formed the quality prescription:
1. distilled water 40～70%; Normal temperature and pressure is down for liquid, and its effect is other raw material of dissolving, and the polymerization solvent for use is provided.
2. acrylamide 20～50%; Normal temperature and pressure is solid powder down; The polymeric principal monomer; Dosage is difficult to polymerization very little; Dosage is too many sudden and violent easily poly-.Unavailable other the similar raw material substitution of this component.
3. calcium-base bentonite 4～15%; Normal temperature and pressure is khaki color solid powder down; Suitably adding can reduce product cost and improve product suction back gel-strength, and the too many back of dosage increases product density.It is the calcium-base bentonite that originates from Anqiu, Shandong that the present invention adopts calcium-base bentonite, for particle diameter at the fine powder below 100 microns, main component is a montmorillonite.This component can substitute with the calcium-base bentonite in other place of production, but the calcium-base bentonite of various places imperfectly understands at present to the influence degree of product performance.
4. alkyl acrylate 5～10%; Normal temperature and pressure is colourless liquid down; Regulate the polymerization single polymerization monomer of product water-swelling time; Dosage acts on not obvious very little; The too many cost of dosage rises.This component can substitute with similar substances such as its vinylformic acid tetradecyl ester, vinylformic acid cetyl ester, vinylformic acid stearyl; The long more polymerization of alkyl chain is difficult more.The short more regulating effect to product performance of alkyl chain is more little.Optimal selection is a dodecylacrylate.
5. Sodium Persulfate 0.1～0.5%; Normal temperature and pressure is white solid powder down; Initiator of polyreaction, dosage are difficult to polymerization very little; Dosage is too many sudden and violent easily poly-.Can replace with Potassium Persulphate.It is not obvious to the product performance influence to replace the back.
6. N,N methylene bis acrylamide 0.1～0.5%; Normal temperature and pressure is white solid powder down; The linking agent of product; The crosslinked body of the difficult very little formation of dosage; The intensity that becomes fragile the too many product of dosage reduces.
Deionized water prepares (being easy to buy on this type of Equipment Market) with the high purity water device in the above raw material, and all the other can buy on market.Common reference books such as the visible chemical industry dictionary of details such as the concrete molecular formula of each raw material.
Existing hydroexpanding body is not except having the acrylic ester, and all the other components and hydrophobic type hydroexpanding body are basic identical.Indivedual producers may be on indivedual raw materials difference to some extent, as replacing Sodium Persulfate etc. with Potassium Persulphate.But it is not obvious that these change the product performance influence.
(2) preparation method
Therefore the hydrophobic type hydroexpanding body can save the dry link in the course of processing than being not easy adhesion between existing hydroexpanding body intensity height, the particle.Existing hydroexpanding body is not easy to save the dry link in the course of processing because intensity is low, wetting ability is strong, particle adhesion easily before not dry.Except dry link, all the other courses of processing of hydrophobic type hydroexpanding body are identical with existing hydroexpanding body.The course of processing of existing hydroexpanding body is followed successively by: puddle, polymerization, pulverizing, drying, screening packing.
The hydrophobic type hydroexpanding body course of processing is followed successively by:
1. material mixing arrives all material mixings together common uncovered puddling in the jar; After adding all raw materials, the time of puddling should not be less than 30 minutes and puddle evenly guaranteeing.Temperature should be lower than 35 ℃ when puddling, unexpected polymerization when preventing to puddle.
2. polymerization is carried out in polymerization reaction kettle, and polymerization reaction kettle is a stainless steel polymerization reaction kettle common on the market.After being pumped into the raw mix of puddling in the polymerization reaction kettle, be warmed to 70～80 ℃, vacuumized simultaneously 20 minutes, logical then nitrogen 1 hour; Material begins polymerization, is incubated 12 to 18 hours down at 70～80 ℃ after the polymerization.
3. pulverize, from reactor top injecting compressed air, the bulk hydroexpanding body extrusion reaction still that polymerization is good is crushed to the granular size that needs with rubber crusher then with air compressor;
4. screening packing need be with the granule sieving packing of pulverizing according to the user, finished product.
Processing used all devices all can buy on market.This course of processing has been saved dry link in the existing hydroexpanding body can guarantee that product is moisture at (existing hydroexpanding body moisture below 20%) between 40%～70%, and it is better to save exsiccant expense and use properties like this.This preparation method's application protection.
Existing hydroexpanding body is the composition of calcium-base bentonite and the crosslinked body of polyacrylamide.Hydrophobic type hydroexpanding body of the present invention is the composition of calcium-base bentonite and acrylamide and dodecylacrylate crosslinking copolymers body, and product molecular structural formula accurately also is difficult to determine at present.
Effect of the present invention: the hydrophobic type hydroexpanding body is compared with existing hydroexpanding body, has following feature:
(1) add hydrophobic grouping, by with the hydrophilic monomer copolymerization, form the hydrophobic type hydroexpanding body.Reduced the wetting ability of hydroexpanding body.Prolonged the water-swelling time.The time that reaches maximum water-swelling multiple in 45 ℃ of distilled water was greater than 48 hours.Simultaneously can improve the hydroexpanding body gel-strength.
(2) Yan Zhi hydrophobic type hydroexpanding body product is a kind of softness, has snappiness, rubber like, and 0.5mm is to the irregular particle between the 8mm.Owing to its softness, can avoid stopping up the valve of profile control pump fully.
(3) the hydrophobic type hydroexpanding body is moisture between 40% to 70%, and its real density between the 1.3g/cm3, is not easy to take place the settlement issues that existing hydroexpanding body takes place in use at 1.1g/cm3.
Embodiment
Embodiment 1
Raw material: distilled water 500Kg, acrylamide 300Kg, calcium-base bentonite 50Kg, dodecylacrylate 50Kg, Sodium Persulfate 1Kg, N,N methylene bis acrylamide 1Kg.
Carry out in strict accordance with the preparation method.1. uncovered puddling in the jar above-mentioned all material mixings are arrived together; Puddle 40 minutes time, puddle 30 ℃ of temperature; 2. the raw mix that will puddle is pumped in the polymerization reaction kettle, is warmed to 75 ℃, vacuumizes simultaneously 20 minutes, logical then nitrogen 1 hour; Be incubated 15 hours down at 75 ℃ after the material polymerization; 3. with air compressor from reactor top injecting compressed air, the bulk hydroexpanding body extrusion reaction still that polymerization is good is crushed to the granular size that needs with rubber crusher then; 4. need be according to the user with the granule sieving packing of pulverizing.
The time of water-swelling that obtains the hydrophobic type hydroexpanding body after testing is greater than existing little, the elastomeric hydrophobic type hydroexpanding body of the hydroexpanding body particle in 48 hours, density.
Embodiment 2
Raw material: distilled water 600Kg, acrylamide 400Kg originates from the calcium-base bentonite 50Kg in Anqiu, Shandong, vinylformic acid tetradecyl ester 100Kg, Sodium Persulfate 1Kg, N,N methylene bis acrylamide 1Kg.
Carry out in strict accordance with the preparation method, 1. above-mentioned all raw materials are puddled together in proportion common uncovered puddling in the jar; Puddle 40 minutes time, puddle temperature and should be lower than 32 ℃; 2. the raw mix that will puddle is pumped in the polymerization reaction kettle, is warmed to 78 ℃, vacuumizes simultaneously 20 minutes, logical then nitrogen 1 hour; Be incubated 14 hours down at 78 ℃ after the material polymerization; 3. with air compressor from reactor top injecting compressed air, the bulk hydroexpanding body extrusion reaction still that polymerization is good is crushed to the granular size that needs with rubber crusher then; 4. need be according to the user with the granule sieving packing of pulverizing.
The time of the hydrophobic type hydroexpanding body water-swelling that obtains after testing was greater than 96 hours, existing little, the elastomeric hydrophobic type hydroexpanding body of the hydroexpanding body particle of density.
Hydrophobic type hydroexpanding body of the present invention confirms through the test in place at these 8 mouthfuls of wells in oil field:
(1) existing hydroexpanding body obstruction profile control pump valve, the problem of stopping work and repairing pump in causing constructing do not take place in hydrophobic type hydroexpanding body in use.
(2) the hydrophobic type hydroexpanding body does not have to take place to have now the settlement issues that occurs when hydroexpanding body uses in use.
(3) the water-swelling time of hydrophobic type hydroexpanding body obviously long than existing hydroexpanding body, can reach 48 hours fully.
Because the hydrophobic type hydroexpanding body is longer than existing hydroexpanding body absorbent time, gel-strength is high, after Dagang Oilfield operation one district, He San district, two districts carry out test in place, has obtained good oil displacement efficiency.
Claims (8)
1, a kind of hydrophobic hydroexpanding body regulating-driving agent is characterized in that: all raw material total masses that comprise distilled water are 100%, and raw material is formed mass ratio and is: 1. distilled water is 40～70%; 2. acrylamide is 20～50%; 3. calcium-base bentonite is 4～15%; 4. alkyl acrylate is 5～10%; 5. Sodium Persulfate is 0.1～0.5%; 6. N,N methylene bis acrylamide is 0.1～0.5%.
2, hydrophobic hydroexpanding body regulating-driving agent as claimed in claim 1 is characterized in that: calcium-base bentonite is the calcium-base bentonite that originates from Anqiu, Shandong.
3, hydrophobic hydroexpanding body regulating-driving agent as claimed in claim 1 is characterized in that: replace Sodium Persulfate with Potassium Persulphate.
4, as claim 1 or 2 or 3 described hydrophobic hydroexpanding body regulating-driving agents, it is characterized in that: the acrylic ester is a dodecylacrylate.
5, as claim 1 or 2 or 3 described hydrophobic hydroexpanding body regulating-driving agents, it is characterized in that: the acrylic ester is a vinylformic acid tetradecyl ester.
6, as claim 1 or 2 or 3 described hydrophobic hydroexpanding body regulating-driving agents, it is characterized in that: the acrylic ester is the vinylformic acid cetyl ester.
7, as claim 1 or 2 or 3 described hydrophobic hydroexpanding body regulating-driving agents, it is characterized in that: the acrylic ester is the vinylformic acid stearyl.
8, hydrophobic hydroexpanding body regulating-driving agent as claimed in claim 1, it is characterized in that: the preparation method is as follows:
1. material mixing: above-mentioned all raw materials are puddled together in proportion common uncovered puddling in the jar; The time of puddling should not be less than 30 minutes, puddles temperature and should be lower than 35 ℃;
2. polymerization: after the raw mix that will puddle is pumped in the polymerization reaction kettle, be warmed to 70～80 ℃, vacuumized simultaneously 20 minutes, logical then nitrogen 1 hour; Be incubated 12 to 18 hours down at 70～80 ℃ after the material polymerization;
3. pulverize: from reactor top injecting compressed air, the bulk hydroexpanding body extrusion reaction still that polymerization is good is crushed to the granular size that needs with rubber crusher then with air compressor;
4. screening packing: need be according to the user with the granule sieving packing of pulverizing, finished product.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101129970A CN1298804C (en) | 2005-10-18 | 2005-10-18 | Hydrophobic water-swelling profile control agent |
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| CNB2005101129970A CN1298804C (en) | 2005-10-18 | 2005-10-18 | Hydrophobic water-swelling profile control agent |
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| CN1298804C true CN1298804C (en) | 2007-02-07 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101314710B (en) * | 2008-07-18 | 2014-07-09 | 中国石油大学(华东) | Oil displacement profile control agent, displacement of reservoir oil system and displacement of reservoir oil method |
| CN103205247B (en) * | 2013-03-29 | 2015-09-16 | 大庆市新万通化工有限公司 | Swollen granular profile control agent and its preparation method and application is delayed in modification |
| CN104610950B (en) * | 2014-12-31 | 2017-12-01 | 中国石油天然气股份有限公司 | Suspended gel particle plugging agent and application thereof |
| CN108756837B (en) * | 2018-05-02 | 2021-07-02 | 中国石油天然气股份有限公司 | Water injection well profile control and flooding method |
| CN112551944B (en) * | 2020-12-09 | 2022-07-22 | 华中科技大学 | Modified bentonite anti-seepage material and preparation method and application thereof |
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| RU2181159C1 (en) * | 2001-03-15 | 2002-04-10 | Западинский Алексей Леонидович | Complex for development of hydrocarbon feedstock (variants) |
| EP1378627A1 (en) * | 2001-03-15 | 2004-01-07 | Alexei Leonidovich Zapadinski | Method for developing a hydrocarbon reservoir (variants) and complex for carrying out said method (variants) |
| CN1552793A (en) * | 2003-06-06 | 2004-12-08 | 吴凤祥 | Pre-crosslinked granular plugging agent and its production |
| CN1560183A (en) * | 2004-02-25 | 2005-01-05 | 石油大学(华东) | Active sol deep regulating and displacing agent |
| CN1611562A (en) * | 2003-10-29 | 2005-05-04 | 中国石油化工股份有限公司 | Ternary polymer oil-displacing agent, and its preparing method and use |
| CN1618923A (en) * | 2004-10-13 | 2005-05-25 | 王秀清 | Water filling well composite regulating and sgliting agent |
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2005
- 2005-10-18 CN CNB2005101129970A patent/CN1298804C/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2181159C1 (en) * | 2001-03-15 | 2002-04-10 | Западинский Алексей Леонидович | Complex for development of hydrocarbon feedstock (variants) |
| EP1378627A1 (en) * | 2001-03-15 | 2004-01-07 | Alexei Leonidovich Zapadinski | Method for developing a hydrocarbon reservoir (variants) and complex for carrying out said method (variants) |
| CN1552793A (en) * | 2003-06-06 | 2004-12-08 | 吴凤祥 | Pre-crosslinked granular plugging agent and its production |
| CN1611562A (en) * | 2003-10-29 | 2005-05-04 | 中国石油化工股份有限公司 | Ternary polymer oil-displacing agent, and its preparing method and use |
| CN1560183A (en) * | 2004-02-25 | 2005-01-05 | 石油大学(华东) | Active sol deep regulating and displacing agent |
| CN1618923A (en) * | 2004-10-13 | 2005-05-25 | 王秀清 | Water filling well composite regulating and sgliting agent |
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