CN102634329A - Low-molecular-weight polymer fracturing liquid - Google Patents
Low-molecular-weight polymer fracturing liquid Download PDFInfo
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Abstract
Low-molecular-weight polymer fracturing liquid is mainly applied to fracturing modification of low-infiltration alkali-sensitive reservoirs and water injection wells and consists of, in weight percentage, 0.25-0.6% of XT-3 low-molecular-weight polymer densifier, 0.2-0.6% of crosslinking agent, 0.5-2% of potassium chloride, 0.02-0.08% of crosslinking modifier, 0.2-0.5% of cleanup additive, 0.0001-0.15% of ammonium persulfate and the balance of water. The low-molecular-weight polymer fracturing liquid is prepared by adding clean water into a liquid preparation tank firstly, adding acetic acid during stirring, then adding the XT-3 low-molecular-weight polymer densifier, the potassium chloride and the cleanup additive after uniformly stirring, stirring more than 10 minutes after materials are added until density or viscosity of upper liquid and lower liquid in the liquid preparation tank are uniform, and finally, adding the crosslinking agent and adhesive breaker according to requirements during fracturing. The low-molecular-weight polymer fracturing liquid has the advantages that residues of the fracturing liquid and alkali-sensitive damages of the reservoirs are solved, the fracturing liquid is prepared and used conveniently, temperature resistance and shearing resistance are fine, and the requirements of fracturing modification of low infiltration and alkali-sensitive reservoirs can be met.
Description
Technical field
The present invention relates to the oil field compression fracture technical field, patent of the present invention belongs to the fracturing liquid of oil-gas field fracturing transformation usefulness, is a kind of low-molecular(weight)polymer fracturing liquid of hypotonic, the quick reservoir of alkali.
Background technology
In the exploration and development process of hydrocarbon-bearing pool, usually can find some hyposmosis, the quick property of alkali reservoir, connect oil field Wu Liyasitai block like North China two and belong to hypotonic (the petrophysical interpretation porosity 8～10% of low porosity and low permeability spy; Rate of permeation 0.05～1.02 * 10 is explained in formation testing
-3μ m
2) the lithology structural oil pool, the reservoir is main with conglomerate, glutenite, has medium water-sensitive, the quick property of alkali.Since the alkaline crosslinked environment of hydroxypropyl guanidine gum fracturing fluid commonly used with contain the part residue, bigger to the injury of reservoir, therefore be not suitable for the pressing crack construction of hyposmosis, the quick reservoir fracturing construction of alkali and WIW.For this reason, developed the crosslinked low molecule of slightly acidic and do not had slag polymkeric substance fracturing liquid system, rig-site utilization has obtained significant effect.
" the acid fracturing liquid of a kind of oligopolymer " of Daqing Oil Field Co., Ltd, publication number: CN102071004A.This fracturing liquid system comprises following each component, and each component is proportioning by mass percentage: the water of 0.35～0.40% oligopolymer, 0.5～0.6% acidic crosslinking agent, 0.06～0.08% Potassium Persulphate and surplus.This low-grade polymer gelled fracturing fluid is a viscosifying agent by oligopolymer, has with clean fracturing fluid and does not similarly have the residue characteristic; Linking agent is acid, and whole fracturing liquid system shows slightly acidic, is specially adapted to the fracturing reform of the quick property of alkali reservoir, and system relies on frozen glue to take sand, can fully guarantee the high sand ratio construction.The shortcoming and defect part of this prescription is: 1. how explanation is not regulated and to be controlled of the fracturing fluid crosslinking time; 2. good ground rock CLAY MINERALS AND THEIR SIGNIFICANCE how; 3. do not add low-temperature activation agent and temperature stabilising agent, narrow application range.
Summary of the invention
The objective of the invention is: a kind of low-molecular(weight)polymer fracturing liquid is provided; Construction requirement (low residue, neutrality or slant acidity) preparation to hypotonic, alkali quick property reservoir and WIW fracturing reform propose fracturing liquid reaches the success ratio and the fracturing effect that improve pressing crack construction; Reduce the injury of fracturing liquid, improve the purpose of oil layer protection the stratum.
The technical scheme that the present invention adopts is: the low-molecular(weight)polymer fracturing liquid comprises:
1, XT-3 low-molecular(weight)polymer viscosifying agent is the multipolymer of acrylic amide, sodium acrylate and (2-acrylamido-2-methyl) propyl sulfonic acid sodium.The white solid small-particle, molecular weight 250,000～300,000, moisture≤10%, viscosity>=80mPas is as fracturing fluid thickener.It can use (pH value=5～6) under the environment of neutral meta-acid, no any resistates behind the broken glue does not have injury to the stratum.Production unit: the profound safe Industrial Co., Ltd. in Xinxiang City, Henan Province, network address, www.hnxtsy.cn.
2, linking agent: preparation in advance, colourless or weak yellow liquid, crosslinking time >=60s, cross-linking properties hangs, heat resistance >=160 ℃.
3, acetic acid (cross-linking regulator): have another name called acetate, colourless or weak yellow liquid.
4, non-ionic type cleanup additive (forming): colourless or weak yellow liquid by multiple non-ionics is composite; 0.2% surface tension≤28mN/m; 0.2% IT≤5mN/m; With positively charged ion and AS compatibleness good (composite back surface tension≤24mN/m, IT≤0.5mN/m) as acidifying and of the fracturing fluid efficient cleanup additive.
5, Repone K: industrial goods, white powder.
6, ammonium persulphate: industrial goods, white crystal, content >=98.0%.
7, Sulfothiorine (temperature stabilising agent): industrial goods, oblique system white crystalline powder.
8, sodium sulfite anhy 96 (low-temperature activation agent): industrial goods, white powder.
9, water.
The low-molecular(weight)polymer fracturing liquid: each weight percentages of components is:
1, XT-3 low-molecular(weight)polymer viscosifying agent, 0.25～0.6%;
2, linking agent, 0.2～0.6%;
3, acetic acid (cross-linking regulator), 0.02～0.08%;
4, non-ionic type cleanup additive, 0.2～0.5%;
5, Repone K, 0.5～2%;
6, ammonium persulphate, 0.0001～0.15%;
7, all the other are water.Each weight percentages of components sum is absolutely.
When temperature >=140 on pressure break stratum ℃, need to add Sulfothiorine (temperature stabilising agent), 0.2%.
When temperature≤55 on pressure break stratum ℃, need to add sodium sulfite anhy 96 (low-temperature activation agent), 0.15%;
Said linking agent is made up of A agent and B agent, and A agent and B agent weight ratio are 4: 1, mix, and obtain linking agent;
Each weight percentages of components of A agent is: aluminum chloride, 10%; Zirconium oxychloride, 10%; Sodium hydroxide, 8%; Glycerine, 10%; Lactic acid, 10%; Methyl alcohol, 20%; Water, 32%.
The preparation method of A agent: add entry, aluminum chloride and zirconium oxychloride at reaction kettle earlier, stirred 10 minutes, add glycerine, lactic acid again, stirring reaction 10min adds sodium hydroxide again, and stirring reaction 5min obtains the A agent.
Each weight percentages of components of B agent is: oxalic dialdehyde, 60%; Phenol, 40%.
The preparation method of B agent: at first the phenol heating is made its fusing for 60～65 ℃; Secondly, in reaction kettle, add oxalic dialdehyde, again the phenol that melts is poured in the reaction kettle, under 70～75 ℃ of conditions of temperature, stirred 30～40 minutes, obtain the B agent.
Each component of non-ionic type cleanup additive comprises:
1, the non-ion fluorin carbon surface active agent (code name: AF4018-Y), pale brown look thick liquid.Production unit: Shanghai Yafu Chemicals Co., Ltd., network address: www.yafuchem.com/
2, the non-ion fluorin carbon surface active agent (code name: EC602T), pale brown look thick liquid.Production unit: the Shanghai rich new technology of three love Materials Co., Ltd, network address:
Www.sh3f.com/
3, polyoxy second rare (10) korenyl phenolic ether (code name: OP-10), colourless or light yellow viscous liquid. production unit: the great first Fine Chemical Co., Ltd in Tianjin, network address: www.tjhaoyuanchem.com/
4, C
12～18Fatty Alcohol(C12-C14 and C12-C18) polyoxy second rare (10) ether (code name: paregal O-10), colourless or light yellow viscous liquid.Production unit: Xingtai is contained and is reached auxiliary agent ltd, network address: www.xtszj.com/chem.asp
5, methyl alcohol, industrial goods.
6, water.
The preparation of non-ionic type cleanup additive: each weight percentages of components of non-ionic type cleanup additive is:
Non-ion fluorin carbon surface active agent (AF4018-Y), 1.5%;
Non-ion fluorin carbon surface active agent (EC602T), 1.5%;
Polyoxy second rare (10) korenyl phenolic ethers (OP-10), 5%;
C
12～18Fatty Alcohol(C12-C14 and C12-C18) polyoxy second rare (10) ether (paregal O-10), 5%;
Methyl alcohol, 20%;
Water, 67%.
Non-ionic type cleanup additive preparation method: earlier add methyl alcohol, (the code name: OP-10) and C of adding polyoxy second rare (10) korenyl phenolic ether under agitation condition at reaction kettle
12～18Fatty Alcohol(C12-C14 and C12-C18) polyoxy second rare (10) ether (code name: paregal O-10); Stir and add non-ion fluorin carbon surface active agent (code name: AF4018-Y), non-ion fluorin carbon surface active agent (code name: EC602T) and water, mix and obtain the non-ionic type cleanup additive after 15 minutes again.
Preparation low-molecular(weight)polymer fracturing liquid:
(1) original gelatin preparation: at first in the big jar of dosing, add clear water; Under agitation condition, add acetic acid; Add XT-3 low-molecular(weight)polymer viscosifying agent, Repone K and cleanup additive after stirring again, material adds the back and stirs more than 10 minutes, makes the concentration or the viscosity uniformity of upper and lower liquid in big jar.The dosing key is will control the pH value of glue well between 5.3～5.7, and of the fracturing fluid crosslinking time was controlled at 1～5 minute.Crosslinked slow when the pH value is low, crosslinked fast when the pH value is high.When pressure break FT >=140 ℃, need to add Sulfothiorine.When pressure break FT≤55 ℃, need to add sodium sulfite anhy 96.
(2) when pressing crack construction, in original gelatin, add linking agent and ammonium persulphate.
Beneficial effect of the present invention: low-molecular(weight)polymer fracturing liquid of the present invention; Taken into full account the compatibility of of the fracturing fluid rheological property and reservoir; Having formed the low molecule of low temperature (10～55 ℃), middle temperature (55～130 ℃), high temperature (130～160 ℃) does not have slag polymkeric substance fracturing liquid, has following characteristics:
(1) fracturing liquid pH value is 5～6, and crosslinking time is adjustable at 1～5 minute;
(2) frictional resistance is low, is merely 40～60% of water;
(3) the heatproof anti-shear performance is good, at 10～160 ℃, 170s
-1Shi Lianxu sheared 2 hours, viscosity>=100mPas;
(4) broken colloidality can be good, at 10～160 ℃ of constant-temperature enclosed placement 0.5～16h, breaking glue solution viscosity≤5mPas;
(5) good to the anti-clayswelling stabilising effect, anti-swollen rate >=80%;
(6) little to reservoir damage, to core damage rate≤15%.
Embodiment
Embodiment 1: crust 10-23 well fractured well section 1307.4～1339.2m, 53 ℃ of reservoir temperatures.
The low-molecular(weight)polymer fracturing liquid: each weight percentages of components is: XT-3 low-molecular(weight)polymer viscosifying agent, 0.3%; Repone K, 2%; Acetic acid, 0.02%; The non-ionic type cleanup additive, 0.5%; Sodium sulfite anhy 96,0.15%; Linking agent, 0.15%; Ammonium persulphate, 0.05～0.15%; All the other are water.Each weight percentages of components sum is absolutely.
Low-molecular(weight)polymer fracturing liquid compound method:
Step 1: the preparation linking agent: linking agent is made up of A agent and B agent, and A agent and B agent weight ratio are 4: 1, mix, and obtain linking agent.
Each weight percentages of components of A agent is: aluminum chloride, 10%; Zirconium oxychloride, 10%; Sodium hydroxide, 8%; Glycerine, 10%; Lactic acid, 10%; Methyl alcohol, 20%; Water, 32%.
The preparation of A agent: add entry, aluminum chloride and zirconium oxychloride at reaction kettle earlier, stirred 10 minutes, add glycerine, lactic acid again, stirring reaction 10min adds sodium hydroxide again, and stirring reaction 5min obtains the A agent.
Each weight percentages of components of B agent is: oxalic dialdehyde, 60%; Phenol, 40%.
The preparation of B agent: at first the phenol heating is made its fusing for 60～65 ℃; Secondly, in reaction kettle, add oxalic dialdehyde, again the phenol that melts is poured in the reaction kettle, under 70～75 ℃ of conditions of temperature, stirred 30～40 minutes, obtain the B agent.
Step 2: the preparation of non-ionic type cleanup additive: each weight percentages of components of non-ionic type cleanup additive is:
Non-ion fluorin carbon surface active agent (AF4018-Y), 1.5%;
Non-ion fluorin carbon surface active agent (EC602T), 1.5%;
Polyoxy second rare (10) korenyl phenolic ethers (OP-10), 5%;
C
12～18Fatty Alcohol(C12-C14 and C12-C18) polyoxy second rare (10) ether (paregal O-10), 5%;
Methyl alcohol, 20%;
Water, 67%.
Non-ionic type cleanup additive preparation method: earlier add methyl alcohol, (the code name: OP-10) and C of adding polyoxy second rare (10) korenyl phenolic ether under agitation condition at reaction kettle
12～18Fatty Alcohol(C12-C14 and C12-C18) polyoxy second rare (10) ether (code name: paregal O-10); Stir and add non-ion fluorin carbon surface active agent (code name: AF4018-Y), non-ion fluorin carbon surface active agent (code name: EC602T) and water, mix and obtain the non-ionic type cleanup additive after 15 minutes again.
Step 3: fracturing liquid original gelatin preparation: in the big jar of dosing, add entry; Under agitation condition, add acetic acid; Add XT-3 low-molecular(weight)polymer viscosifying agent, Repone K, sodium sulfite anhy 96 and cleanup additive after stirring again; Material adds the back and stirs more than 10 minutes, makes the concentration or the viscosity uniformity of upper and lower liquid in big jar.
Step 4: when pressing crack construction injects the fracturing liquid original gelatin, in the fracturing liquid original gelatin, add linking agent, add ammonium persulphate.
Result of use: produce oil 2.69m before the pressure break
3/ t, water 0.48m
3/ t, produce oil 9.86m after the pressure break
3/ t, water 1.69m
3/ t.
Embodiment 2: 27-13 well fractured well section 1764.0～1755.4m too, 73 ℃ of reservoir temperatures.
The Molecularly Imprinted Polymer fracturing liquid: each weight percentages of components is: 0.35%XT-3 low-molecular(weight)polymer viscosifying agent; 1% Repone K; 0.022% acetic acid; 0.5% non-ionic type cleanup additive; 0.2% linking agent; 0.02～0.15% ammonium persulphate; All the other are water, and each weight percentages of components sum is absolutely.
Low-molecular(weight)polymer fracturing liquid compound method:
Step 1 and step 2: the preparation linking agent is identical with embodiment 1 with preparation non-ionic type cleanup additive.
Step 3: fracturing liquid original gelatin preparation: in the big jar of dosing, add entry; Under agitation condition, add acetic acid; Add XT-3 low-molecular(weight)polymer viscosifying agent, Repone K and cleanup additive after stirring again; Material adds the back and stirs more than 10 minutes, makes the concentration or the viscosity uniformity of upper and lower liquid in big jar.
Step 4: when pressing crack construction injects the fracturing liquid original gelatin, in the fracturing liquid original gelatin,, add ammonium persulphate by adding linking agent.
Result of use: produce oil 1.78m before the pressure break
3/ t, water 0.06m
3/ t presses back produce oil 13.1m
3/ t, water 0.29m
3/ t.
Embodiment 3: A Er 3-50 well fractured well section 2144.0～2614.0m, 83 ℃ of reservoir temperatures.
The low-molecular(weight)polymer fracturing liquid: each weight percentages of components is: 0.4%XT-3 low-molecular(weight)polymer viscosifying agent; 1% Repone K; 0.025% acetic acid; 0.5% non-ionic type cleanup additive; 0.25% linking agent, 0.015～0.15% ammonium persulphate; All the other are water, and each weight percentages of components sum is absolutely.
Low-molecular(weight)polymer fracturing liquid compound method:
Step 1 and step 2: the preparation linking agent is identical with embodiment 1 with preparation non-ionic type cleanup additive.
Step 3: the preparation of fracturing liquid original gelatin is identical with embodiment 2.
Step 4: when pressing crack construction injects the fracturing liquid original gelatin, in the fracturing liquid original gelatin, add linking agent, add ammonium persulphate.
Result of use: produce oil 2.69m before the pressure break
3/ t, water 0.08m
3/ t presses back produce oil 12.68m
3/ t, water 2.59m
3/ t.
Embodiment 4:NP4-32X well fractured well section 3463.6～3486.2m, 123 ℃ of reservoir temperatures.
The low-molecular(weight)polymer fracturing liquid: each weight percentages of components is: 0.5%XT-3 low-molecular(weight)polymer viscosifying agent; 1% Repone K; 0.026% acetic acid; 0.5% non-ionic type cleanup additive; 0.4% linking agent; 0.001～0.15%; All the other are water, and each weight percentages of components sum is absolutely.
Low-molecular(weight)polymer fracturing liquid compound method:
Step 1 and step 2: the preparation linking agent is identical with embodiment 1 with preparation non-ionic type cleanup additive.
Step 3: the preparation of fracturing liquid original gelatin is identical with embodiment 2.
Step 4: when pressing crack construction injects the fracturing liquid original gelatin, in the fracturing liquid original gelatin, add linking agent, add ammonium persulphate.
Result of use: produce oil 3.17m before the pressure break
3/ t, water 1.26m
3/ t; Press back produce oil 15.68m
3/ t, water 3.69m
3/ t.
Embodiment 5: stay 69-11X well fractured well section 3567.80～3614.00m, 141 ℃ of reservoir temperatures.
The low-molecular(weight)polymer fracturing liquid: each weight percentages of components is: 0.55%XT-3 low-molecular(weight)polymer viscosifying agent; 1% Repone K; 0.026% acetic acid; 0.5% non-ionic type cleanup additive; 0.2% Sulfothiorine; 0.45% linking agent; 0.0005～0.15% ammonium persulphate.All the other are water, and each weight percentages of components sum is absolutely.
Low-molecular(weight)polymer fracturing liquid compound method:
Step 1 and step 2: the preparation linking agent is identical with embodiment 1 with preparation non-ionic type cleanup additive.
Step 3: fracturing liquid original gelatin preparation: in the big jar of dosing, add entry; Under agitation condition, add acetic acid; Add XT-3 low-molecular(weight)polymer viscosifying agent, Repone K, Sulfothiorine and cleanup additive after stirring again; Material adds the back and stirs more than 10 minutes, makes the concentration or the viscosity uniformity of upper and lower liquid in big jar.
Step 4: when pressing crack construction injects the fracturing liquid original gelatin, in the fracturing liquid original gelatin, add linking agent, press wedge type and add ammonium persulphate, the proportionlity of " adding by wedge type " is: 0.0005～0.15%.
Result of use: produce oil 4.38m before the pressure break
3/ t, water 0.03m
3/ t; Press back produce oil 9.56m
3/ t, water 0.12m
3/ t.
The meaning that " adds by wedge type " is: during pressing crack construction, getting into the temperature that the fracturing liquid on stratum bears at first is the top temperature on stratum, needs a spot of ammonium persulphate just can break glueization.Along with the carrying out of pressing crack construction, because of the fracturing fluid cooling effect, the FT from the man-made fracture tip to pit shaft is more and more lower.Therefore the back get into that the temperature that the fracturing liquid on stratum bears is more and more lower, the shearing that receives also the time shorter and shorter, the gel breaker amount that the fracturing liquid rubber-breaking aquation needs in the engineering time also can be increasing.Return row in order to make fracturing liquid finish the fast broken glueization in back in construction, reduce the injury to the stratum, ammonium persulphate is added by little (lower concentration) → big (high density) in construction process, is referred to as " pressing wedge type adds ".
Claims (8)
1. low-molecular(weight)polymer fracturing liquid, it is characterized in that: each weight percentages of components is:
XT-3 low-molecular(weight)polymer viscosifying agent, 0.25～0.6%;
Linking agent, 0.2～0.6%;
Acetic acid, 0.02～0.08%;
The non-ionic type cleanup additive, 0.2～0.5%;
Repone K, 0.5～2%;
Ammonium persulphate, 0.0001～0.15%;
All the other are water, and each weight percentages of components sum is absolutely.
2. low-molecular(weight)polymer fracturing liquid according to claim 1 is characterized in that: also comprise Sulfothiorine, 0.2%.
3. low-molecular(weight)polymer fracturing liquid according to claim 1 is characterized in that: also comprise sodium sulfite anhy 96,0.15%.
4. according to claim 1,2 or 3 described low-molecular(weight)polymer fracturing liquids, it is characterized in that: linking agent is made up of A agent and B agent, and A agent and B agent weight ratio are 4: 1, mix, and obtain linking agent.
Each weight percentages of components of A agent is: aluminum chloride, 10%; Zirconium oxychloride, 10%; Sodium hydroxide, 8%; Glycerine, 10%; Lactic acid, 10%; Methyl alcohol, 20%; Water, 32%;
The preparation of A agent: add entry, aluminum chloride and zirconium oxychloride at reaction kettle earlier, stirred 10 minutes, add glycerine, lactic acid again, stirring reaction 10min adds sodium hydroxide again, and stirring reaction 5min obtains the A agent;
Each weight percentages of components of B agent is: oxalic dialdehyde, 60%; Phenol, 40%;
The preparation of B agent: at first the phenol heating is made its fusing for 60～65 ℃; Secondly, in reaction kettle, add oxalic dialdehyde, again the phenol that melts is poured in the reaction kettle, under 70～75 ℃ of conditions of temperature, stirred 30～40 minutes, obtain the B agent.
5. low-molecular(weight)polymer fracturing liquid according to claim 1 is characterized in that: the non-ionic type cleanup additive: each weight percentages of components of non-ionic type cleanup additive is:
Non-ion fluorin carbon surface active agent AF4018-Y, 1.5%;
Non-ion fluorin carbon surface active agent EC602T, 1.5%;
Polyoxy second rare (10) korenyl phenolic ether OP-10,5%;
C
12～18Fatty Alcohol(C12-C14 and C12-C18) polyoxy second rare (10) ether, 5%;
Methyl alcohol, 20%;
Water, 67%;
Non-ionic type cleanup additive preparation method: add methyl alcohol at reaction kettle earlier, under agitation condition, add polyoxy second rare (10) korenyl phenolic ether OP-10 and C
12～18Fatty Alcohol(C12-C14 and C12-C18) polyoxy second rare (10) ether stirs and adds non-ion fluorin carbon surface active agent AF4018-Y, non-ion fluorin carbon surface active agent EC602T and water after 15 minutes again, mixes and obtains the non-ionic type cleanup additive.
6. according to claim 1,4 or 5 described low-molecular(weight)polymer fracturing liquids, it is characterized in that: the preparation method:
(1) original gelatin preparation: at first in the big jar of dosing, add clear water; Under agitation condition, add acetic acid; Add XT-3 low-molecular(weight)polymer viscosifying agent, Repone K and cleanup additive after stirring again, material adds the back and stirs more than 10 minutes, makes the concentration or the viscosity uniformity of upper and lower liquid in big jar; The dosing key is will control the pH value of glue well between 5.3～5.7, and of the fracturing fluid crosslinking time was controlled at 1～5 minute;
(2) when pressing crack construction, in original gelatin, add linking agent and ammonium persulphate.
7. low-molecular(weight)polymer fracturing liquid according to claim 2 is characterized in that: the preparation method:
(1) original gelatin preparation: at first in the big jar of dosing, add clear water; Under agitation condition, add acetic acid; Add XT-3 low-molecular(weight)polymer viscosifying agent, Repone K, Sulfothiorine and cleanup additive after stirring again; Material adds the back and stirs more than 10 minutes, makes the concentration or the viscosity uniformity of upper and lower liquid in big jar; The dosing key is will control the pH value of glue well between 5.3～5.7, and of the fracturing fluid crosslinking time was controlled at 1～5 minute;
(2) when pressing crack construction, in original gelatin, add linking agent and ammonium persulphate.
8. low-molecular(weight)polymer fracturing liquid according to claim 3 is characterized in that: the preparation method:
(1) original gelatin preparation: at first in the big jar of dosing, add clear water; Under agitation condition, add acetic acid; Add XT-3 low-molecular(weight)polymer viscosifying agent, Repone K, sodium sulfite anhy 96 and cleanup additive after stirring again; Material adds the back and stirs more than 10 minutes, makes the concentration or the viscosity uniformity of upper and lower liquid in big jar; The dosing key is will control the pH value of glue well between 5.3～5.7, and of the fracturing fluid crosslinking time was controlled at 1～5 minute;
(2) when pressing crack construction, in original gelatin, add linking agent and ammonium persulphate.
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| CN103275690A (en) * | 2013-05-23 | 2013-09-04 | 中国石油天然气股份有限公司 | Crosslinking agent for polymer hydrofracturing fluid as well as preparation and application of crosslinking agent |
| CN103666437A (en) * | 2012-09-18 | 2014-03-26 | 中国石油天然气股份有限公司 | Fracturing fluid |
| CN104513654A (en) * | 2013-10-08 | 2015-04-15 | 中国石油化工股份有限公司 | Improver, oil-displacing agent composition, oil-displacing agent and preparation method thereof |
| CN104559995A (en) * | 2013-10-09 | 2015-04-29 | 中国石油化工股份有限公司 | Delayed crosslinking fracturing fluid composition |
| WO2017023935A1 (en) * | 2015-08-03 | 2017-02-09 | Ecolab Usa Inc. | Compositions and methods for delayed crosslinking in hydraulic fracturing fluids |
| CN104073234B (en) * | 2014-06-03 | 2017-03-08 | 中国石油天然气股份有限公司 | A kind of fracturing fluid based on nonmetallic ion cross-linking agent and preparation method and application |
| CN109486477A (en) * | 2017-09-11 | 2019-03-19 | 中国石油天然气股份有限公司 | A kind of oil-gas field fracturing liquid and its application method |
| CN110437819A (en) * | 2019-09-17 | 2019-11-12 | 四川洁能锐思石油技术有限公司 | A kind of low polymer fracturing fluid and preparation method thereof |
| US10550315B2 (en) | 2016-07-15 | 2020-02-04 | Ecolab Usa Inc. | Compositions and methods for delayed crosslinking in hydraulic fracturing fluids |
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