CN103074049B - Fracturing fluid prepared by recovery waste water of crude oil and preparation method of fracturing fluid - Google Patents
Fracturing fluid prepared by recovery waste water of crude oil and preparation method of fracturing fluid Download PDFInfo
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Abstract
The invention discloses an association polymer fracturing fluid prepared by recovery waste water of crude oil. The fracturing fluid comprises the following components: 0.2-1.4wt% of thickening agent, 0.01-0.1wt% of thickening assistant, 0.05-0.1% of metal ion stabilizing agent, 0.02-0.05wt% of water block preventive, 0.05-0.2wt% of high-temperature stabilizing agent, 1-2wt% of clay stabilizing agent and the balance of the recovery waste water of the crude oil. Compared with the prior art, the fracturing fluid has the benefits that the fracturing fluid system adopts an association polymer as a primary thickening agent, no cross-linking agent is used, structural viscosity is formed by the synergetic effect of the association polymer and an ampholytic surfactant, and the fracturing fluid has the characteristics of temperature resistance, good salt tolerance, shear resistance, bacterial corrosion resistance and low friction, and has a good solid carrying behavior when the viscosity is greater than 20mPa*s.
Description
Technical field
The present invention relates to hydrocarbon-bearing pool yield-increasing technology field, be specifically related to a kind of fracturing liquid and the compound method thereof that use crude oil extraction waste water.
Background technology
Hydraulic fracturing technology is the gordian technique of low permeability reservoir transformation, and waterfrac treatment needs to consume a large amount of fresh water, impacts local water resources, and in the water resources shortage such as Shanxi, Gansu area, this impact is particularly serious.Crude oil extraction sewage refers to the local water with crude oil, gas extraction together extraction.Along with oilfield exploitation enters the middle and later periods, water content in crude oil up to 80-90%, crude oil extraction sewage be treated as an increasingly serious problem.If crude oil extracted waste water preparing fracturing fluid can be used, waterfrac treatment can be alleviated and can solve oil recovery treatment problem again to the demand of water resources.
Conventional aqueous fracturing fluid is generally the plant gum fracturing fluid of melon glue class, has strict requirement to the pH value, salinity, bacterium, foreign matter content etc. of dosing water.And the salinity of oil extraction waste water is usually all higher, and containing a large amount of bacteriums, also have the impurity such as crude oil, solid particulate, these often all can cause plant gum fracturing fluid layering, putrid and deteriorated, are difficult to the requirement meeting pressing crack construction simultaneously.Need to form a kind of new fracturing fluid system, to meet the of the fracturing fluid needs of crude oil extraction waste water.
Summary of the invention
The object of the present invention is to provide a kind of fracturing liquid and compound method thereof of use crude oil extraction waste water, this fracturing liquid frictional resistance is low, and anti-shear performance is strong, resistance to bacterial corrosion, is applicable to low permeability reservoir transformation.
For reaching above technical purpose, the invention provides following technical scheme.
The present invention mainly utilizes association polymer heatproof, salt tolerant, resistance to bacterial corrosion, anti-shear performance is good, frictional resistance is low feature, auxiliary densification aid, temperature stabilising agent, Waterproof lock agent, clay stabilizer etc., form the association polymer fracturing fluid system using oil extraction-generated waste water preparation, to make full use of crude oil extraction sewage, reduce waterfrac treatment to the consumption of Freshwater resources.
Its component and content as follows: viscosifying agent, 0.2 ~ 1.4 % by weight; Multiviscosisty assistant agent, 0.01 ~ 0.1 % by weight; Metal ion stabilizing agents, 0.05 ~ 0.1 % by weight; Waterproof lock agent, 0.02 ~ 0.05 % by weight; High-temperature stabiliser, 0.05 ~ 0.2 % by weight; Clay stabilizer, 1 ~ 2 % by weight; All the other components are crude oil extraction sewage.
In fracturing liquid of the present invention, described viscosifying agent is association polymer, and product trade name is one hundred Chinese toon gel, product designation BCG-1, is produced, industrial goods by Chengdu one hundred Chinese toon Petroleum Technology Co., Ltd.Molecular weight is between 500 ~ 1,000 ten thousand, and optimum concn is 0.4 ~ 0.8 % by weight.This viscosifying agent, for introduce hydrophobic grouping on water-soluble polymers, is assembled by the Hydrophobic-lipophilic interaction between hydrophobic grouping, forms space structure.There is heatproof, salt tolerant, anti-shear performance is good, frictional resistance is low feature.
In fracturing liquid of the present invention, described densification aid is alkyl ethoxy sultaine, and structural formula is as follows:
R is C
12~ C
16alkyl, the value of m, n is between 8 ~ 20.
This densification aid is zwitterionics, under condition of different pH, all have excellent stability, and has good anti-water hardness tolerance, bactericidal properties.Good with viscosifying agent compatibility, in aqueous, it can act synergistically with viscosifying agent molecular chain, and the space structure density of remarkable enhancing system, plays the effect of " physical crosslinking " between viscosifying agent molecule.
In fracturing liquid of the present invention, described metal ion stabilizing agents is disodium ethylene diamine tetraacetate.
In fracturing liquid of the present invention, described Waterproof lock agent is perfluorinated nonene oxygen base benzene sulfonic acid sodium salt, and structural formula is as follows:
This Waterproof lock agent and other additive compatibility, carbon atom on its hydrocarbon chain is replaced by fluorine atoms, there is the effect of hydrophobic oleophobic, solution surface tension and oil water interfacial tension can be reduced simultaneously, thus reduce the constraint of capillary force, prevent the water blocking damage of fracturing liquid filtrate formation, significant to the transformation of low permeability reservoir.
In fracturing liquid of the present invention, described high-temperature stabiliser is ammonium thiosulfate, 0.05 ~ 0.2 % by weight;
In fracturing liquid of the present invention, described clay stabilizer is Repone K, 1 ~ 2 % by weight;
The raw material used in fracturing liquid of the present invention is commercially available chemical pure or technical pure.
Fracturing liquid of the present invention, use ammonium persulphate capsule breaker early stage in construction, the construction later stage uses ammonium persulphate, and add-on is 0.02 ~ 0.2 % by weight.
The of the fracturing fluid compound method of crude oil extraction sewage base association polymer of the present invention is as follows:
1) preparation of fracturing liquid base fluid
Under circulation or agitator agitation condition, viscosifying agent, metal ion stabilizing agents, Waterproof lock agent, high-temperature stabiliser, clay stabilizer is slowly added by above-mentioned concentration in crude oil extraction sewage, abundant circulation or stirring, treat viscosifying agent complete swelling, obtains fracturing liquid base fluid.
2) of the fracturing fluid preparation
Under agitation, fracturing liquid base fluid and multiviscosisty assistant agent are fully mixed by above-mentioned concentration, obtains viscoelastic fracturing liquid.
Compared with prior art, the present invention has following beneficial effect:
(1) use crude oil extraction waste water association polymer fracturing liquid, both alleviated the demand of waterfrac treatment to water resources, and solved again oil recovery treatment problem;
(2) this fracturing fluid system uses association polymer as multiviscosisty host, do not use linking agent, structural viscosity is formed by the synergistic function between association polymer and amphoterics, have heatproof, salt tolerant, good, the resistance to bacterial corrosion of anti-shear performance, feature that frictional resistance is low, viscosity is greater than 20mPas just to be had and good takes grittiness energy;
(3) in fracturing liquid, introduce Waterproof lock agent, effectively can reduce that fracturing liquid filtrate formation causes water blocking damage, be conducive to improving Oil/gas Well output, significant to low permeability reservoir transformation.
Accompanying drawing explanation
Fig. 1 is the heatproof resistant to shearing test curve of fracturing liquid under 60 DEG C of conditions;
Fig. 2 is the heatproof resistant to shearing test curve of fracturing liquid under 100 DEG C of conditions;
Fig. 3 is hydraulic fracture operating curve.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1
Well crude oil extraction sewage (salinity is below the 40000) water quality analysis of A oil field is in table 1
Table 1 crude oil extraction sewage quality is analyzed
Viscosifying agent by 0.6 % by weight, 0.05 % by weight metal ion stabilizing agents, 0.03 % by weight Waterproof lock agent, 0.1 % by weight high-temperature stabiliser, 1 % by weight clay stabilizer, surplus is above-mentioned oil extraction-generated waste water, preparing fracturing fluid base fluid.
The multiviscosisty assistant agent adding 0.03 % by weight in fracturing liquid base fluid fully mixes, and obtains viscoelastic fracturing liquid.Use high temperature rheometer under 60 DEG C of conditions, carry out of the fracturing fluid temperature and shearing sustainability test, test curve is shown in Fig. 1.As can be seen from 60 DEG C of heatproof resistant to shearing tests, at 170s
-1when continuing to shear, fracturing liquid viscosity is greater than 50mPas all the time, shows that this system has good heatproof, resistant to shearing performance.
Embodiment 2
Use above-mentioned crude oil extraction sewage, the viscosifying agent by 0.8 % by weight, 0.05 % by weight metal ion stabilizing agents, 0.03 % by weight Waterproof lock agent, 0.15 % by weight high-temperature stabiliser, 1 % by weight clay stabilizer, preparing fracturing fluid base fluid.
The multiviscosisty assistant agent adding 0.04 % by weight in fracturing liquid base fluid fully mixes, and obtains viscoelastic fracturing liquid.Use high temperature rheometer under 100 DEG C of conditions, carry out of the fracturing fluid temperature and shearing sustainability test, test curve is shown in Fig. 2, as can be seen from 100 DEG C of heatproof resistant to shearing tests, at 170s
-1when continuing to shear, fracturing liquid viscosity is greater than 50mPas all the time, shows that this system has good heatproof, resistant to shearing performance.
Embodiment 3
1, on-the-spot dosing
Prepare A crude oil extraction sewage 180 side, load in 6 large tanks of 30 side, adopt fluidics preparation base fluid, by the formula in the table 2 successively each additive of circulation suction in every tank crude oil extraction sewage, cycle balance is greater than 30mPaS to apparent viscosity, viscosifying agent slowly sucks, with do not lump and flake be as the criterion, check liquid viscosity after cycle balance.
Table 2 fracturing liquid additive formulations
2, site operation
Formation temperature 73 DEG C, adopts φ 73mmN80 oil pipe to inject construction, pkr protective casing.In pressing crack construction process, add the multiviscosisty assistant agent of 0.03 % by weight from truck-mounted blender in base fluid, spearhead and sand-carrying agent prometaphase add 0.03-0.05 % by weight ammonium persulphate capsule, and the sand-carrying agent later stage adds 0.02-0.1 % by weight ammonium persulphate.
Pressing crack construction injects discharge capacity 3.2-3.5m
3/ min, break pump pressure 60.8MPa, adds 0.425-085mm Midst density haydite 20m altogether
3, average sand is than 24.94%.As shown in Figure 3, fracture gradient of constructing in figure is normal, and pressure is steady, and formation fracture extends normal.Complete construction by design and construction sand than smoothly, show to adopt the association polymer fracturing fluid property of crude oil extraction waste water excellent, pressing crack construction requirement can be met.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (2)
1. use a fracturing liquid for crude oil extraction waste water, it is characterized in that, its component and content as follows: viscosifying agent, 0.2 ~ 1.4 % by weight; Multiviscosisty assistant agent, 0.01 ~ 0.1 % by weight; Metal ion stabilizing agents, 0.05 ~ 0.1 % by weight; Waterproof lock agent, 0.02 ~ 0.05 % by weight; High-temperature stabiliser, 0.05 ~ 0.2 % by weight; Clay stabilizer, 1 ~ 2 % by weight; All the other components are crude oil extraction sewage; Described viscosifying agent is association polymer, and product trade name is one hundred Chinese toon gel, product designation BCG-1, is produced by Chengdu one hundred Chinese toon Petroleum Technology Co., Ltd; Described densification aid is alkyl ethoxy sultaine, and structural formula is as follows:
R is C
12~ C
16alkyl, the value of m, n is between 8 ~ 20; Described metal ion stabilizing agents is disodium ethylene diamine tetraacetate; Described Waterproof lock agent is perfluorinated nonene oxygen base benzene sulfonic acid sodium salt, and structural formula is as follows:
described high-temperature stabiliser is ammonium thiosulfate; Described clay stabilizer is Repone K.
2. of the fracturing fluid preparation method according to claim 1, it is characterized in that, 1) preparation of fracturing liquid base fluid: under circulation or agitator agitation condition, viscosifying agent, metal ion stabilizing agents, Waterproof lock agent, high-temperature stabiliser, clay stabilizer is slowly added by concentration described in claim 1 in crude oil extraction sewage, abundant circulation or stirring, treat viscosifying agent complete swelling, obtain fracturing liquid base fluid;
2) of the fracturing fluid preparation: under agitation, fully mixes fracturing liquid base fluid and multiviscosisty assistant agent by concentration described in claim 1, obtains viscoelastic fracturing liquid.
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| CN103589410B (en) * | 2013-10-22 | 2016-05-11 | 中国石油天然气股份有限公司 | Thickened oil steam-stimulated well stifled energization is used temporarily chemical assistant and compound method and application |
| CN104650845A (en) * | 2013-11-22 | 2015-05-27 | 中国石油天然气股份有限公司 | High temperature non-crosslinked clean fracturing fluid and preparation method thereof |
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| CN105733547B (en) * | 2016-01-29 | 2019-08-09 | 成都佰椿石油科技有限公司 | One kind low frictional resistance resistant to high temperatures aggravates clean fracturing fluid and preparation method thereof |
| CN105694840B (en) * | 2016-04-21 | 2018-10-16 | 中国石油大学(华东) | A kind of fluorine-containing cleanup additive of pressure break |
| CN105778884B (en) * | 2016-05-10 | 2019-06-25 | 西南石油大学 | The supermolecule polymer clean fracturing fluid of anti-170 DEG C of high temperature |
| CN106268496B (en) * | 2016-07-21 | 2018-08-24 | 西南石油大学 | A kind of Shuangzi amphoteric viscoelastic surfactant and preparation method thereof and using it as the clean fracturing fluid of thickening agent |
| CN107474816B (en) * | 2017-05-25 | 2020-11-10 | 西南石油大学 | High-temperature-resistant seawater-based polymer fracturing fluid capable of being continuously mixed and prepared and preparation method thereof |
| CN107828404A (en) * | 2017-11-20 | 2018-03-23 | 中国石油天然气股份有限公司 | A kind of fracturing fluid for matching somebody with somebody liquid for oil field high salinity recovered water |
| CN108559479B (en) * | 2018-05-30 | 2020-05-22 | 西南石油大学 | Reverse microemulsion polymer fracturing liquid system capable of being constructed on line |
| CN108865103A (en) * | 2018-07-12 | 2018-11-23 | 中国石油集团西部钻探工程有限公司 | The method of liquid additive and preparation method thereof and extemporaneous preparation fracturing fluid |
| CN111636921B (en) * | 2020-05-29 | 2022-04-05 | 中国石油大学(华东) | Method for storing crude oil by using low-permeability and ultra-low-permeability stratum |
| CN114958330B (en) * | 2021-02-22 | 2023-06-30 | 中国石油天然气股份有限公司 | Waterproof locking agent for fracturing and preparation method thereof |
| CN114561202A (en) * | 2022-03-30 | 2022-05-31 | 陕西志详拓实业有限公司 | High-viscosity blending-free variable-viscosity fracturing fluid and preparation method thereof |
| CN114836191A (en) * | 2022-04-12 | 2022-08-02 | 中海石油(中国)有限公司 | Low-corrosion solid-free high-density completion fluid and preparation method thereof |
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