CN110437815A - Seawater-based fracturing fluid and preparation method thereof - Google Patents
Seawater-based fracturing fluid and preparation method thereof Download PDFInfo
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- CN110437815A CN110437815A CN201910681592.0A CN201910681592A CN110437815A CN 110437815 A CN110437815 A CN 110437815A CN 201910681592 A CN201910681592 A CN 201910681592A CN 110437815 A CN110437815 A CN 110437815A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
- C09K8/685—Compositions based on water or polar solvents containing organic compounds containing cross-linking agents
Abstract
The invention belongs to oil field fracturing fluid fields, and in particular to a kind of seawater-based fracturing fluid and preparation method thereof, seawater-based fracturing fluid includes base fluid, crosslinking agent, synergist and gel breaker；The seawater-based fracturing fluid base fluid, is grouped as by the group of following parts by weight: 1000 parts of seawater, 2.5-4.5 parts of thickening agent, 3-5 parts of cleanup additive, and 1-2 parts of fungicide；The seawater-based fracturing fluid crosslinking agent is the 3.5-5% of base fluid quality；The seawater-based fracturing fluid synergist is the 1.5-2.5% of base fluid quality；The gel breaker is the 0.05-0.1% of base fluid quality.Seawater-based fracturing fluid of the invention, solves that modifyed guar gum dosage of the existing technology is high (0.65%), and residue content is high, precipitating is easily generated with calcium ions and magnesium ions, pollution stratum, cannot continuous mixture, deficiency in economic performance the problem of.
Description
Technical field
The invention belongs to oil field fracturing fluid fields, and in particular to a kind of seawater-based fracturing fluid and preparation method thereof.
Background technique
In recent years, as the new exploration acreage low permeability reservoir proportion of domestic offshore oil and gas field is gradually increased, oil field development
The storey increase designs measures such as middle introducing hydraulic fracturing become inevitable.Currently, liquid system used in marine pressure break is mainly fresh water pressure
Split liquid system.For fresh water by steamer storage and transportation, space is limited, not only seriously restricts pressure break scale, and there are at high cost, construction periods
Long problem；And offshore oil and gas field seawater resources are abundant, and it is simple, at low cost using seawater preparing fracturing fluid process, it can accelerate
Construction speed has apparent technology and economic advantages.Have the advantage that the supply of (1) seawater is filled with seawater preparing fracturing fluid
Foot, seawater fracturing fluid are particularly suitable for the transformation of offshore oil gas well massive hydraulic fracture, such as horizontal well fracturing, volume fracturing.
(2) it fetches water, can accelerate construction progress on the spot, reduce operating cost；(3) freshwater resources are saved；(4) high salinity of seawater can
To inhibit clay swell in reservoir, there are apparent technology and economic advantages.
To realize seawater preparing fracturing fluid, domestic Ye You relevant unit has carried out research of technique, Authorization Notice No. CN
103215024 B, grant date are that the Chinese patent literature on January 20th, 2016 discloses a kind of ocean high temperature oil gas reservoir pressure break use
Seawater-based fracturing fluid；Be formulated according to parts by weight by following raw material: 0.3 part -0.8 part of thickening agent, pH adjusting agent accounts for 0.1
- 0.3 part of part, cleanup additive accounts for 0.1 part -0.5 part；Crosslinking agent accounts for 0.4 part -0.6 part；0.2 part -0.6 part of heatproof reinforcing agent；Oxygen scavenger
0.8 part -1.5 parts；0.1 part -0.3 part of fungicide, 0.1 part -0.5 part of 0.1 part -0.5 part of clay stabilizer and foaming agent and broken glue
0.04-0.06 parts of agent.Wherein used thickening agent is: guar gum, carboxymethyl hydroxypropyl guar gum, hydroxypropyl guar gum, perfume (or spice)
Bean gum or sesbania gum；Used crosslinking agent is organic zirconium crosslinker, organic titanium cross-linking agent, organic boron zirconium cross linking agent, organic boron
Titanium multiple crosslinking agent or organic titanium zirconium multiple crosslinking agent；The pH adjusting agent is triethanolamine, potassium carbonate, sodium carbonate, carbonic acid
Hydrogen sodium or sodium hydroxide.Heatproof reinforcing agent is hydrazine, thiocarbamide or sulphite；Oxygen scavenger is thiocarbamide, formaldehyde or arabo-ascorbic acid.
150 DEG C of fracturing fluid heatproof.
But using above patent document as the high temperature resistant seawater-based fracturing fluid of representative, in actual use, thickener is used
High (0.65 part or more) is measured, swelling time is long, and cause fracturing fluid base fluid tank medium viscosity excessively high, pumping difficulties when construction, Wu Fashi
Existing high flow rate operation and directly mixed construction operation；Heatproof reinforcing agent, oxygen scavenger dosage are high, and fracturing liquid rubber-breaking performance is poor；PH tune
Section agent contains hydroxide ion or carbanion, easily forms sediment with Calcium in Seawater, magnesium ion, pollutes stratum；Chemistry adds
Add agent type more, is unfavorable for maritime environment protection.
Summary of the invention
The present invention is directed to poor, no for above-mentioned seawater-based fracturing fluid crosslinking agent existing in the prior art and seawater compatibility
It is able to achieve continuous mixture, the technical problem of environmental-protecting performance difference, a kind of seawater-based fracturing fluid crosslinking agent and fracturing fluid and preparation are provided
Method.
The present invention to achieve the above object, using following technical scheme:
A kind of seawater-based fracturing fluid, including base fluid, crosslinking agent, synergist and gel breaker；
The seawater-based fracturing fluid base fluid, is made of the component of following parts by weight: 1000 parts of seawater, thickening agent 2.5-
4.5 parts, 3-5 parts of cleanup additive, 1-2 parts of fungicide；
The seawater-based fracturing fluid crosslinking agent is the 3.5-5% of base fluid quality；
The seawater-based fracturing fluid synergist is the 1.5-2.5% of base fluid quality；
The gel breaker is the 0.05-0.1% of base fluid quality.
Seawater-based fracturing fluid crosslinking agent, including following content of component: 40-60 parts of clear water, polyhydric alcohol amine borate 25-35
Part, 10-15 parts of polyalcohol and 5-8 parts of boric acid are to get seawater-based fracturing fluid crosslinking agent.
The polyhydric alcohol amine borate is diethanol amine borate, triethanolamine borate and mixture.
The preparation method of seawater-based fracturing fluid crosslinking agent includes the following steps: under the conditions of being stirred at room temperature, into reaction kettle
Group component clear water, polyhydric alcohol amine borate and polyalcohol is added to be sufficiently mixed；In mixed liquor plus boric acid, stirring are allowed to fill
Divide reaction dissolution, forms uniform solution, crosslinking agent is made.
The seawater-based fracturing fluid synergist, including following content of component: 50-60 parts of clear water, ethylenediamine tetraacetic methylene
20-25 parts of base sodium phosphate and 15-25 parts of polyalcohol are to get seawater-based fracturing fluid synergist.
The seawater-based fracturing fluid synergist is prepared using following manner: normal pressure, and component is added into reaction kettle for stirring
Clear water and ethylenediamine tetramethylene sodium phosphate and polyalcohol are measured, is sufficiently mixed, uniform solution is formed, synergist is made.
The polyalcohol is glycerine or ethylene glycol.
The thickening agent is hydroxypropyl guar gum；The cleanup additive is alkyl glycoside surfactant；The fungicide
For dodecylbenzyl ammonium chloride；Gel breaker is potassium peroxydisulfate or ammonium persulfate.
The application further includes the method for seawater-based fracturing fluid described in one kind, includes the following steps: to measure seawater by component,
It is added in mixed tune device, adjusts voltage 50V~55V, successively thickening agent, cleanup additive is added in group component, and fungicide mixes and adjusts device high-speed stirred
90s；Crosslinking agent and synergist is added to obtain the final product.
Wherein, the seawater is that calcium and magnesium ion content is not more than 2000mg/L, and total salinity is less than 40000.
Compared with prior art, the beneficial effects of the present invention are:
1, seawater-based fracturing fluid of the invention solves modifyed guar gum dosage height (0.65%) of the existing technology, residual
Slag content is high, precipitating is easily generated with calcium ions and magnesium ions, pollution stratum, cannot continuous mixture, deficiency in economic performance the problem of.Shape of the present invention
At seawater-based fracturing fluid have modifyed guar gum using concentration it is low (0.25%-0.45%), residue content is low, it is not necessary that temperature is added
The additives such as stabilizer, oxygen scavenger, 160 DEG C of heat resistance, fragile glue；It is not necessary that alkaline pH adjusting agent, no calcium ions and magnesium ions are added
Precipitating generates, and has to reservoir damage small, the high feature of clean-up performance；Directly continuous mixture can be achieved.Meet the hypotonic oil in ocean
Extra large 70% or more sample pressure break overall cost is saved in the transformation of gas-bearing formation massive hydraulic fracture liquid, effectively shortens construction period.
2, the seawater-based fracturing fluid crosslinking agent Main Components triethanolamine borate.Its is nontoxic；With higher
Base number storage level, splendid pH value buffer capacity, can effectively stabilising system pH value.Compared with other borates, there is pole
Good water solubility, the triethanolamine borate containing unshared electron pair nitrogen-atoms have higher hydrolytic stability, hydrolysis speed
Degree is suitable.Triethanolamine borate facile hydrolysis can be crosslinked at triethanolamine and boric acid, one side boric acid with modifyed guar gum, three ethyl alcohol
PH environment needed for amine provides crosslinking, another aspect triethanolamine and various metals generate the chelate of 2-4 ligand, can have
The calcium ions and magnesium ions in chelating seawater base are imitated, aobvious alkalinity itself can provide crosslinking environment for boric acid and modifyed guar gum crosslinking, mention
It when being crosslinked environment for alkalescent, precipitates and generates without calcium ions and magnesium ions, and it is not necessary that the pH adjusting agents such as sodium hydroxide, sodium carbonate are added.
3, borate complex is added in triethanolamine borate to use, it is therefore an objective to improve seawater-based fracturing fluid crosslinking time,
Make fracturing fluid before entering stratum, there is suitable viscosity, meets the needs for taking sand and drop resistance, this point is for huge discharge, set
Pipe pressure break is particularly important, and fracturing fluid hangs sand ability difference in pit shaft will cause pit shaft sand setting, may cause construction failure；It drops resistive
Can be poor, cause operation pressure height, it is equally possible to cause construction to fail, compound in crosslinking agent into a small amount of boric acid, pressure break can be improved
Cross-linking properties of the liquid before entering pit shaft, realization is good to take sand and resistance reducing effect.
4, the seawater-based fracturing fluid synergist reduces the risk that calcium and magnesium precipitating is generated in fracturing fluid use process；Make thick
It is suitable for swelling rate that agent, which has,；Seawater-based fracturing fluid has better cross-linking efficiency and temperature resistant capability.
5, the seawater-based fracturing fluid can meet the requirement of direct mixture, at 160 DEG C, 170s-1Under, continuous shear stress
60min, viscosity are maintained at 30mPa or more, meet the needs of massive hydraulic fracture；Seawater-based fracturing fluid crosslinking time 15s-90s can
It adjusts, resistance-reducing yield >=80% is, it can be achieved that massive hydraulic fracture；The completely broken glue of seawater-based fracturing fluid 360min, breaking glue solution viscosity≤
2mPa.s, residue content≤200mg/L.
Specific embodiment
In order to make those skilled in the art more fully understand technical solution of the present invention, implement below with reference to best
The present invention is described in further detail for example.
Embodiment 1: the preparation of crosslinking agent: the seawater-based fracturing fluid is crosslinked agent compounding method, under the conditions of being stirred at room temperature, to
50kg clear water is added in reaction kettle to be sufficiently mixed in proportion with 30kg triethanolamine borate, 15kg glycerol；Add in mixed liquor
Enter 8kg boric acid, stirring is allowed to sufficiently react dissolution, forms uniform solution, crosslinking agent is made.
The preparation of synergist: the seawater-based fracturing fluid is crosslinked agent compounding method, under the conditions of being stirred at room temperature, into reaction kettle
60kg clear water is added to be sufficiently mixed in proportion with 25kg ethylenediamine tetramethylene sodium phosphate, 15kg glycerol；Stirring is allowed to sufficiently anti-
It should dissolve, form uniform solution, synergist is made.
The preparation of seawater-based fracturing fluid: the seawater-based fracturing fluid is by base fluid, crosslinking agent, synergist.The base fluid: by with
The component of lower parts by weight forms, wherein 1000 parts of seawater, 2.5-4.5 parts of thickening agent, 3-5 parts of cleanup additive, and 1-2 parts of fungicide；Institute
State the 3.5-5% that seawater-based fracturing fluid crosslinking agent is base fluid quality；The seawater-based fracturing fluid synergist is base fluid quality
1.5-2.5%；The gel breaker is base fluid quality
0.05-0.1%.The thickening agent is hydroxypropyl guar gum；The cleanup additive is alkyl glycoside surfactant；Institute
The fungicide stated is dodecylbenzyl ammonium chloride；Gel breaker is potassium peroxydisulfate or ammonium persulfate.Seawater is measured by component, is added
It is mixed to adjust in device, voltage 50V~55V is adjusted, successively thickening agent, cleanup additive is added in group component, and fungicide mixes and adjusts device high-speed stirred 90s；
Crosslinking agent and synergist is added to obtain the final product.
In terms of gained seawater-based fracturing fluid total solution mass fraction, 0.05-0.1 is added and breaks part jelly potassium peroxydisulfate, is placed in
Insulating box, constant temperature 360min under the conditions of reservoir temperature make the fracturing fluid break glue at a constant temperature.Table 1 shows 135 DEG C of seawater bases
Fracturing fluid property index.Table 1 shows seawater-based fracturing fluid performance:
Table 1
Field application of the present invention is more than 10 wells.Application example: ZH54-22 well, high angle hole, pressure break well section
4362.4m-4470.3m, 63.20 ° of hole deviation, using more shower hole+bridge plug staged fracturing techniques, divides three sections by 135 DEG C of formation temperature
Pressure break, using the total liquid measure 4500m of seawater-based fracturing fluid3, total sand amount 350m3, construction smoothly completes.Pressure 2.8MPa, 4mm before pressing
Oil nozzle self-spray, day oil-producing 0.14t, daily gas 3200m3；Initial stage pressure 10MPa after pressure, 6mm oil nozzle, day oil-producing 52.6t, daily output
Gas 15840m3, significant effect.
Evaluation scene uses seawater, pH value 7.5-8.0, suspended matter≤50mg/L, calcium and magnesium ion content 1000mg/L-
2000mg/L, total salinity is less than 40000.Liquid method is matched using continuous mixture.Match according to 135 DEG C of formation temperature preferred fracturing fluids
Side.Including 100 parts of seawater, 0.35 part of thickening agent, 0.3 part of cleanup additive, 0.1 part of fungicide.The crosslinking agent: opposite with crosslinking agent
In the mass fraction meter of base fluid, 0.3 part is accounted for.The synergist: by synergist based on the mass fraction of base fluid, 0.16 is accounted for
Part；Gel breaker is 0.07 part.Table 2 shows ZH54-22 well field application fracturing fluid property tables of data.
Table 2
Seawater-based fracturing fluid field compounding method: ZH54-22 well location first leads to seawater before Bohai Bay beach areas, construction
It crosses pipeline to be introduced into the salt pond on well site, precipitates, clean seawater is pumped into soft pot according still further to design quantity.It is straight when construction
Continue mixture in succession, fracturing fluid additive through fracturing blender truck is pumped directly into pit shaft after mixing on continuous mixing truck with seawater, the well
Smoothly implementation, which demonstrates modifyed guar gum seawater-based fracturing fluid of the invention, has excellent swelling, crosslinking, seam and prop-carrying capacity,
Problem of the existing technology is efficiently solved, is had a extensive future.
The above is only a preferred embodiment of the present invention, for those of ordinary skill in the art, according to the present invention
Thought, there will be changes in the specific implementation manner and application range, and the content of the present specification should not be construed as to the present invention
Limitation.
Claims (9)
1. a kind of seawater-based fracturing fluid, it is characterised in that: including base fluid, crosslinking agent, synergist and gel breaker；
The seawater-based fracturing fluid base fluid, is grouped as by the group of following parts by weight: 1000 parts of seawater, helps 2.5-4.5 parts of thickening agent
Agent 3-5 parts, 1-2 parts of fungicide of row；
The seawater-based fracturing fluid crosslinking agent is the 3.5-5% of base fluid quality；
The seawater-based fracturing fluid synergist is the 1.5-2.5% of base fluid quality；
The gel breaker is the 0.05-0.1% of base fluid quality.
2. seawater-based fracturing fluid according to claim 1, it is characterised in that: seawater-based fracturing fluid crosslinking agent, including it is following
Content of component: 5-8 parts of 40-60 parts of clear water, 25-35 parts of polyhydric alcohol amine borate, 10-15 parts of polyalcohol and boric acid to get
Seawater-based fracturing fluid crosslinking agent.
3. seawater-based fracturing fluid according to claim 2, it is characterised in that: the polyhydric alcohol amine borate is diethanol
Amine borate, triethanolamine borate and mixture.
4. seawater-based fracturing fluid according to claim 2, it is characterised in that: the preparation method of seawater-based fracturing fluid crosslinking agent
Include the following steps: under the conditions of being stirred at room temperature, group component clear water, polyhydric alcohol amine borate, Yi Jiduo are added into reaction kettle
First alcohol is sufficiently mixed；In mixed liquor plus boric acid, stirring are allowed to sufficiently react dissolution, form uniform solution, crosslinking agent is made.
5. seawater-based fracturing fluid according to claim 1, it is characterised in that: the seawater-based fracturing fluid synergist, packet
Include following content of component: 50-60 parts of clear water, 20-25 parts of ethylenediamine tetramethylene sodium phosphate and 15-25 parts of polyalcohol.
6. seawater-based fracturing fluid according to claim 5, it is characterised in that: the seawater-based fracturing fluid synergist uses
Following manner preparation: group component clear water and ethylenediamine tetramethylene sodium phosphate, Yi Jiduo are added into reaction kettle for normal pressure, stirring
First alcohol, is sufficiently mixed, and forms uniform solution, synergist is made.
7. according to seawater-based fracturing fluid described in claim 2 or 5, it is characterised in that: the polyalcohol be glycerine or
Person's ethylene glycol.
8. seawater-based fracturing fluid according to claim 1, it is characterised in that: the thickening agent is hydroxypropyl guar gum；Institute
The cleanup additive stated is alkyl glycoside surfactant；The fungicide is dodecylbenzyl ammonium chloride；Gel breaker is persulfuric acid
Potassium or ammonium persulfate.
9. a kind of method for preparing the described in any item seawater-based fracturing fluids of claim 1-8, which is characterized in that including following steps
It is rapid: by component measurement seawater, it is added in mixed tune device, adjusts voltage 50 V~55 V, successively group component addition thickening agent, cleanup additive,
Fungicide mixes and adjusts device high-speed stirred 90s；Crosslinking agent and synergist is added to obtain the final product.
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| CN114196390A (en) * | 2020-09-17 | 2022-03-18 | 中国石油天然气股份有限公司 | Composite oil displacement fracturing fluid and preparation method and application thereof |
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