CN100999659A - Graft type fracturing fluid and preparation process thereof - Google Patents
Graft type fracturing fluid and preparation process thereof Download PDFInfo
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- CN100999659A CN100999659A CN 200610173388 CN200610173388A CN100999659A CN 100999659 A CN100999659 A CN 100999659A CN 200610173388 CN200610173388 CN 200610173388 CN 200610173388 A CN200610173388 A CN 200610173388A CN 100999659 A CN100999659 A CN 100999659A
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Abstract
The present invention relates to grafting type fracturing fluid comprising grafting type glue 0.4-1.0 wt %, metal cross-linking agent 0.05-0.7wt %, cracking oxidant 0.05-0.5wt % and water for the rest. The grafting type fracturing fluid of the present invention may be used to replace glue of natural plant material, and has water insoluble matter content as low as 1.0-3.0 wt %, residue after cracking of 20-60 mg/L and low cost.
Description
Technical field
The invention belongs to the technical field of aqueous fracturing fluid, relate to a kind of graft type fracturing fluid and preparation method.
Background technology
Fracturing liquid can make oil well production increasing, intensified injection of wells.Usually two kinds of used be divided into oil base fracturing fluid and aqueous fracturing fluids.Wherein aqueous fracturing fluid safety, cheap not only, and viscosity height, frictional resistance is low, the easy row of returning.Thereby use wider.At present to use more be the natural plant type to the aqueous fracturing fluid gelatinizing agent, and as guar gum, sesbania gum etc. and polymer class are as polyacrylamide etc.But residue content is up to 20-30% behind the broken glue of natural plant gelatinizing agent, to zone permeability, fill out husky fissured flow conductivity injury is all arranged.Though and residue content is low behind the broken glue of polymkeric substance gelatinizing agent, the salt compatibility is relatively poor in itself and the stratum, and price is higher.Thereby, prepare the superior fracturing liquid gelatinizing agent of a kind of cost performance and have stronger practical significance.
About the technology of fracturing liquid gelatinizing agent, be mostly that utilization has the easily crosslinked characteristics of cis hydroxyl groups natural plant it is used, but the most price of this class natural plant is higher in the past.And the comparatively cheap natural plant kind of price as starch, cellulose family, is difficult for crosslinked owing to it has trans hydroxyl.And with polymer graft on the natural plant class, improve its performance, simultaneously reducing cost.Patent about this class graft type gelatinizing agent yet there are no report.
Summary of the invention
The invention provides a kind of graft type fracturing fluid and preparation method thereof.
Constituting of a kind of graft type fracturing fluid of the present invention: the graft type gelatinizing agent is that the 0.4-1.0wt% of fracturing liquid quality, 0.05-0.7wt%, the oxidation gel breaker that metal crosslinking agent is the fracturing liquid quality are the 0.05-0.5wt% of fracturing liquid quality, and all the other are deionized water;
Described graft type gelatinizing agent is Mierocrystalline cellulose or starch based derivative and acrylamide monomers graft copolymer;
Described Mierocrystalline cellulose or starch based derivative can be carboxymethyl cellulose, carboxymethyl hydroxyethyl cellulose or carboxymethyl hydroxypropyl cellulose, and substitution value is 0.3-2.5;
Described acrylamide monomers can be acrylamide, vinylformic acid, acrylate or 2-acrylamide-2-methyl propane sulfonic acid;
Described metal crosslinking agent is Tai-Ace S 150, potassium aluminium sulfate, aluminum nitrate, titanium tetrachloride, titanium sulfate, titanous sulfate, organic titanium or organic zirconium;
Described oxidation gel breaker is hydrogen peroxide, ammonium persulphate or Potassium Persulphate.
The step and the condition of method for making that the invention provides a kind of graft type fracturing fluid is as follows:
(1). in reaction vessel, be 100 with Mierocrystalline cellulose or starch based derivative and acrylamide monomer in mass ratio: the ratio of 10-50: 200-1000 is made the aqueous solution, fills N2 and removes oxygen in the system; The initiator that adds the 0.02-1.00wt% of monomer mass is an ammonium persulphate; React 2-6h down at 40-60 ℃, products therefrom is diluted to the aqueous solution that mass concentration is 0.4-1.0wt% through water, promptly obtains making dry powder after graft type fracturing fluid base fluid or the drying.
(2). the dry powder of making after graft type fracturing fluid base fluid that step (1) is obtained or the drying is mixed with the graft type fracturing fluid base fluid, before using 30 ℃ of constant temperature 4 hours, regulating the pH value then is 6.5, the linking agent that adds the 0.05-0.7wt% of fracturing liquid quality, simultaneously, add the oxidation gel breaker of the 0.05-0.7wt% of fracturing liquid quality, obtain a kind of graft type fracturing fluid.
Graft type fracturing fluid can be separated stickingly in 2-20 hour under 40-75 ℃, separated sticking back viscosity and was lower than 5mpa.s.
The invention provides the complete alternative natural plant class of its performance of a kind of graft type fracturing fluid, the water-insoluble residue content is 1.0-3.0wt%, and residue content is 20-60mg/L, and cost can reduce 10-20%.
Embodiment
Embodiment 1
In reaction vessel, with carboxymethyl cellulose and acrylamide monomer by carboxymethyl cellulose: acrylamide: water (mass ratio)=100: 10-50: 750 make the aqueous solution, fill N
2Remove the oxygen in the system, add the initiator (1wt% ammonium persulfate solution) of 0.5wt% (monomer mass relatively), react 5h down at 50 ℃; Reaction product is diluted to the aqueous solution that mass concentration is 0.4-1.0wt%, can obtain a kind of graft type fracturing fluid base fluid; The base fluid apparent viscosity is measured and is adopted the RV-20 rotational viscosimeter, at 45 ℃ of following 170S
-1Finish under the shearing rate.The results are shown in table 1:
Table 1
| Carboxymethyl cellulose: acrylamide (mass ratio) | Base fluid apparent viscosity mpa.s |
| 100∶10 100∶20 100∶30 100∶40 100∶50 | 60 75 115 150 178 |
Embodiment 2
In reaction vessel, carboxymethyl starch and acrylamide monomer are formed sediment by carboxymethyl: acrylamide: water (mass ratio)=100: 30-60: 200 make the aqueous solution; Fill N
2Remove the oxygen in the system, add the initiator (1wt% ammonium persulfate solution) of 1.0wt% (monomer mass relatively), react 6h down at 40 ℃; Reaction product is diluted to the aqueous solution that mass concentration is 0.4-1.0wt%, can obtain a kind of graft type fracturing fluid base fluid; The base fluid apparent viscosity is measured and is adopted the RV-20 rotational viscosimeter, at 45 ℃ of following 170S
-1Finish under the shearing rate.The results are shown in table 2:
Table 2
| Carboxymethyl starch: acrylamide (mass ratio) | Base fluid apparent viscosity mpa.s |
| 100∶30 100∶40 100∶50 100∶60 | 76 105 135 180 |
Embodiment 3
In reaction vessel, with carboxymethyl cellulose and acrylamide monomer by carboxymethyl cellulose: acrylamide: water (mass ratio)=make the aqueous solution at 100: 30: 1000, fill N
2Remove the oxygen in the system, add the initiator (1wt% ammonium persulfate solution) of 0.02wt% (monomer mass relatively), react 2h down at 60 ℃; Products therefrom is diluted to the aqueous solution that mass concentration is 0.4-1.0wt% through water, promptly obtains a kind of base fluid of graft type fracturing fluid;
The base fluid of graft type fracturing fluid was 30 ℃ of constant temperature 4 hours, after regulation system pH value is 6.5, stir and add potassium aluminium sulfate and ammonium persulfate aqueous solution down, wherein potassium aluminium sulfate and ammonium persulphate usage quantity be respectively the 0.5wt% and the 0.05wt% of fracturing liquid quality, can obtain a kind of graft type fracturing fluid.
Fixing 170S
-1Shearing rate is measured graft type fracturing fluid base fluid apparent viscosity; After system is cross-linked into gel, at 45 ℃, 170S
-1Shearing rate down cut 1 hour, the apparent viscosity of measurement gel.Apparent viscosity is measured and is adopted the RV-20 rotational viscosimeter to finish.
Table 3
| Carboxymethyl cellulose: acrylamide (mass ratio g/g) | Base fluid viscosity mpa.s | Initial gel viscosity mpa.s | Gel viscosity mpa.s after 30 minutes | Gel viscosity mpa.s after 1 hour | Viscosity mpa.s behind the broken glue |
| 100∶30 | 115 | 420 | 250 | 140 | ≤5 |
Embodiment 4
In reaction vessel, with carboxymethyl starch and acrylamide monomer by carboxymethyl starch: acrylamide: water (mass ratio)=make the aqueous solution at 100: 50: 200, fill N
2Remove the oxygen in the system, add the initiator (1wt% ammonium persulfate solution) of 1.0wt% (monomer mass relatively), react 5h down at 50 ℃; Products therefrom is diluted to the aqueous solution that mass concentration is 0.4-1.0wt% through water, can obtain a kind of base fluid of graft type fracturing fluid.
The base fluid of graft type fracturing fluid was 30 ℃ of constant temperature 4 hours, after regulation system pH value is 6.5, stir adding potassium aluminium sulfate and ammonium persulfate aqueous solution down, wherein the usage quantity of potassium aluminium sulfate and ammonium persulphate is respectively the 0.7wt% and the 0.5wt% of fracturing liquid quality, can obtain a kind of graft type fracturing fluid.
Fixing 170S
-1Shearing rate is measured graft type fracturing fluid base fluid apparent viscosity; After system is cross-linked into gel, at 45 ℃, 170S
-1Shearing rate down cut 1 hour, the apparent viscosity of measurement gel.Apparent viscosity is measured and is adopted the RV-20 rotational viscosimeter to finish.
Table 4
| Carboxymethyl starch: acrylamide (mass ratio g/g) | Base fluid viscosity mpa.s | Initial gel viscosity mpa.s | Gel viscosity mpa.s after 30 minutes | Gel viscosity mpa.s after 1 hour | Viscosity mpa.s behind the broken glue |
| 100∶50 | 135 | 380 | 210 | 130 | ≤5 |
Embodiment 5
In reaction vessel, with carboxymethyl cellulose and acrylamide monomer by carboxymethyl cellulose: acrylamide: water (mass ratio)=make the aqueous solution at 100: 20: 1000, fill N
2Remove the oxygen in the system, add the initiator (1wt% ammonium persulfate solution) of 0.5wt% (monomer mass relatively), react 6h down at 40 ℃; Products therefrom is diluted to the aqueous solution that mass concentration is 0.4-1.0wt% through water, can obtain a kind of base fluid of graft type fracturing fluid.
The base fluid of graft type fracturing fluid was 30 ℃ of constant temperature 4 hours; Get the good graft type fracturing fluid base fluid 50.25g of constant temperature, be put in the constant centrifuge tube, centrifugal 30min under the rotating speed of 3000r/min, slowly pour out supernatant liquid, add distilled water 50mL again, use the glass stick agitator treating, centrifugal again 20min, remove supernatant liquid, centrifuge tube is dried to constant weight at 105 ℃.Water insoluble matter content is calculated as follows:
η＝m/0.25×100
In the formula: η-water insoluble matter content, %; M-water-insoluble quality, unit: g;
To remain the graft type fracturing fluid base fluid regulates after the pH value is 6.5, stir and add potassium aluminium sulfate and ammonium persulfate aqueous solution down, wherein potassium aluminium sulfate and ammonium persulphate usage quantity be respectively the 0.05wt% and the 0.15wt% of fracturing liquid quality, can obtain a kind of graft type fracturing fluid.
After system is cross-linked into gel,, will separate after product centrifuging with fixed attention, weigh after the oven dry at 45 ℃ of following constant temperature 24h.Residue content is calculated as follows:
Residue content=(quality of the quality-centrifuge tube of residue and centrifuge tube) mg/ breaking glue solution volume L
Of the fracturing fluid water insoluble matter content is 1.0% under this condition, and residue content is 20mg/L.
Embodiment 6
In reaction vessel, with carboxymethyl starch and acrylamide monomer by carboxymethyl starch: acrylamide: water (mass ratio)=make the aqueous solution at 100: 30: 200, fill N
2Remove the oxygen in the system, add the initiator (1wt% ammonium persulfate solution) of 0.7wt% (monomer mass relatively), react 4h down at 60 ℃; Products therefrom is diluted to the aqueous solution that mass concentration is 0.4-1.0wt% through water, can obtain a kind of base fluid of graft type fracturing fluid.
The graft type fracturing fluid base fluid was 30 ℃ of constant temperature 4 hours; Get the good graft type fracturing fluid base fluid 50.25g of constant temperature, be put in the constant centrifuge tube, centrifugal 30min under the rotating speed of 3000r/min, slowly pour out supernatant liquid, add distilled water 50mL again, use the glass stick agitator treating, centrifugal again 20min, remove supernatant liquid, centrifuge tube is dried to constant weight at 105 ℃.Water insoluble matter content is calculated as follows:
η＝m/0.25×100
In the formula: η-water insoluble matter content, %; M-water-insoluble quality, unit: g;
To remain the graft type fracturing fluid base fluid regulates after the pH value is 6.5, stir and add potassium aluminium sulfate and ammonium persulfate aqueous solution down, wherein potassium aluminium sulfate and ammonium persulphate usage quantity be respectively the 0.25wt% and the 0.1wt% of fracturing liquid quality, can obtain a kind of graft type fracturing fluid.
After system is cross-linked into gel,, will separate after product centrifuging with fixed attention, weigh after the oven dry at 45 ℃ of following constant temperature 24h.Residue content is calculated as follows:
Residue content=(quality of the quality-centrifuge tube of residue and centrifuge tube) mg/ breaking glue solution volume L
Of the fracturing fluid water insoluble matter content is 1.4% under this condition, and residue content is 40mg/L.
Claims (2)
1, a kind of graft type fracturing fluid, it is characterized in that its composition and proportioning are: the graft type gelatinizing agent is the 0.4-1.0wt% of fracturing liquid quality, and metal crosslinking agent is the 0.05-0.7wt% of fracturing liquid quality, the oxidation gel breaker is the 0.05-0.5wt% of fracturing liquid quality, and all the other are deionized water;
Described graft type gelatinizing agent is Mierocrystalline cellulose or starch based derivative and acrylamide monomers graft copolymer;
Described Mierocrystalline cellulose or starch based derivative can be carboxymethyl cellulose, carboxymethyl hydroxyethyl cellulose or carboxymethyl hydroxypropyl cellulose, and substitution value is 0.3-2.5;
Described acrylamide monomers can be acrylamide, vinylformic acid, acrylate or 2-acrylamide-2-methyl propane sulfonic acid;
Described metal crosslinking agent is Tai-Ace S 150, potassium aluminium sulfate, aluminum nitrate, titanium tetrachloride, titanium sulfate, titanous sulfate, organic titanium or organic zirconium;
Described oxidation gel breaker is hydrogen peroxide, ammonium persulphate or Potassium Persulphate.
2, the preparation method of a kind of graft type fracturing fluid as claimed in claim 1 is characterized in that, step and condition are:
(1). in reaction vessel, be 100 with Mierocrystalline cellulose or starch based derivative and acrylamide monomer in mass ratio: the ratio of 10-50: 200-1000 is made the aqueous solution, fills N2 and removes oxygen in the system; The initiator that adds the 0.02-1.00wt% of monomer mass is an ammonium persulphate; React 2-6h down at 40-60 ℃, products therefrom is diluted to the aqueous solution that mass concentration is 0.4-1.0wt% through water, promptly obtains making dry powder after graft type fracturing fluid base fluid or the drying;
(2). the dry powder of making after graft type fracturing fluid base fluid that step (1) is obtained or the drying is mixed with the graft type fracturing fluid base fluid, before using 30 ℃ of constant temperature 4 hours, regulating the pH value then is 6.5, the linking agent that adds the 0.05-0.7wt% of fracturing liquid quality, simultaneously, add the broken glue of oxidation of the 0.05-0.7wt% of fracturing liquid quality, obtain a kind of graft type fracturing fluid.
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| CN101121880B (en) * | 2007-08-01 | 2011-01-12 | 成都市互利达实业有限公司 | Natural macromolecule modified starch profile control agent for oil field |
| CN102352229A (en) * | 2011-08-03 | 2012-02-15 | 西安长庆化工集团有限公司 | Acid gel fracturing fluid and preparation method thereof |
| CN101747885B (en) * | 2008-12-15 | 2013-05-15 | 安徽天润化学工业股份有限公司 | Method for preparing high molecular weight salt-resistant polymer oil displacement agents |
| CN103119124A (en) * | 2010-10-07 | 2013-05-22 | 阿克佐诺贝尔化学国际公司 | Low residue formation fracturing |
| CN103881687A (en) * | 2014-03-11 | 2014-06-25 | 中国石油天然气股份有限公司 | Instant modified cellulose cross-linked clean fracturing fluid and preparation method thereof |
| CN104046349A (en) * | 2013-03-11 | 2014-09-17 | 北京仁创科技集团有限公司 | Aqueous fracturing fluid and preparation method thereof |
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| US6450260B1 (en) * | 2000-07-07 | 2002-09-17 | Schlumberger Technology Corporation | Sand consolidation with flexible gel system |
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| CN101747885B (en) * | 2008-12-15 | 2013-05-15 | 安徽天润化学工业股份有限公司 | Method for preparing high molecular weight salt-resistant polymer oil displacement agents |
| CN103119124A (en) * | 2010-10-07 | 2013-05-22 | 阿克佐诺贝尔化学国际公司 | Low residue formation fracturing |
| CN102352229A (en) * | 2011-08-03 | 2012-02-15 | 西安长庆化工集团有限公司 | Acid gel fracturing fluid and preparation method thereof |
| CN104046349B (en) * | 2013-03-11 | 2017-11-24 | 北京仁创科技集团有限公司 | A kind of aqueous fracturing fluid and preparation method thereof |
| CN104046349A (en) * | 2013-03-11 | 2014-09-17 | 北京仁创科技集团有限公司 | Aqueous fracturing fluid and preparation method thereof |
| CN103881687A (en) * | 2014-03-11 | 2014-06-25 | 中国石油天然气股份有限公司 | Instant modified cellulose cross-linked clean fracturing fluid and preparation method thereof |
| CN103881687B (en) * | 2014-03-11 | 2016-10-19 | 中国石油天然气股份有限公司 | A kind of instant modified cellulose crosslinking clean fracturing fluid and preparation method thereof |
| CN105566571A (en) * | 2016-02-17 | 2016-05-11 | 常州市庆发工业气体有限公司 | Preparation method of pre-crosslinked starch-based low-residue thickening agent |
| CN109825262A (en) * | 2019-02-22 | 2019-05-31 | 天津渤海中联石油科技有限公司 | A kind of drilling fluid compound film former and preparation method thereof |
| CN109825262B (en) * | 2019-02-22 | 2021-01-26 | 天津渤海中联石油科技有限公司 | Composite film forming agent for drilling fluid and preparation method thereof |
| CN111662692A (en) * | 2020-06-04 | 2020-09-15 | 中海油田服务股份有限公司 | Drilling fluid |
| CN111662692B (en) * | 2020-06-04 | 2022-12-09 | 中海油田服务股份有限公司 | Drilling fluid |
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| CN100595257C (en) | 2010-03-24 |
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