CN108676552A - A kind of unconventional low temperature clean fracturing fluid and preparation method thereof - Google Patents
A kind of unconventional low temperature clean fracturing fluid and preparation method thereof Download PDFInfo
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- CN108676552A CN108676552A CN201810344624.3A CN201810344624A CN108676552A CN 108676552 A CN108676552 A CN 108676552A CN 201810344624 A CN201810344624 A CN 201810344624A CN 108676552 A CN108676552 A CN 108676552A
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- low temperature
- fracturing fluid
- temperature clean
- clean fracturing
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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
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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
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/887—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/26—Gel breakers other than bacteria or enzymes
Abstract
The invention belongs to oil/gas well reservoir fracturing improvement technical fields, disclose a kind of unconventional low temperature clean fracturing fluid, are prepared by the raw material of following mass percent：0.20 0.35% thickening agent, 0.20 0.35% crosslinking agent, 0.20% cleanup additive, 0.20% expansion-resisting agent, 0.10 0.20% gel breaker, surplus are water.By preparing each component of unconventional low temperature clean fracturing fluid respectively, then by each component mixing to get above-mentioned unconventional low temperature clean fracturing fluid.Unconventional low temperature clean pressure break liquid energy provided by the invention thoroughly breaks glue under 20 DEG C of cryogenic conditions, and residue content is low, and polymer volume is small, the advantages of in combination with cleaning foam fracturing fluid system, at low cost, the row of returning leads height, apparent for oil-gas reservoir effect of increasing production, the scope of application is wide.The preparation method of unconventional low temperature clean fracturing fluid provided by the invention is simple with liquid, easy to manufacture, convenient for promoting.
Description
Technical field
The invention belongs to oil/gas well reservoir fracturing improvement technical fields, and in particular to a kind of unconventional low temperature clean fracturing fluid
And preparation method thereof.
Background technology
Currently, there are many kinds of low temperature fracture fluid systems, and patent of the present invention is most similar " the low temperature resistant pressure break of oil exploitation
Liquid and preparation method thereof " (Chinese invention patent application publication No. CN104861955A) and a kind of " low temperature fracture fluid " (middle promulgated by the State Council
Bright patent application publication CN103881692A).It is resistance to low described in " low temperature resistant fracturing fluid of oil exploitation and preparation method thereof "
Warm fracturing fluid system is big to formation damage, and residue content is high after breaking gel, and the row of returning leads low, and base fluid viscosity is unfavorable for pumping greatly, uncomfortable
It is exploited for untraditional reservoir；Polymer hybridizes fenugreek in a kind of low temperature fracture fluid system described in " low temperature fracture fluid "
Glue and its derivative are as polymer-modified, and residue content is high, and low formation contaminant is big, and system can not be broken after temperature is less than 30 DEG C
Glue.In order to overcome existing low temperature fracture fluid system, residue content is high after breaking gel, the row of returning lead it is low, less than 30 DEG C under the conditions of can not break
Glue, the defects of not being suitable for the exploitation of untraditional reservoir, are badly in need of developing a kind of new fracturing fluid.
Invention content
In order to solve the above problem of the existing technology, present invention aims at provide one kind can break at low temperature glue,
The unconventional low temperature clean fracturing fluid and preparation method thereof that residue content is low and low formation contaminant is small.
The technical solution adopted in the present invention is：
The present invention provides a kind of unconventional low temperature clean fracturing fluids, mainly by the raw material of following mass percent prepare and
At：The thickening agent of 0.20-0.35%, the crosslinking agent of 0.20-0.35%, 0.20% cleanup additive, 0.20% expansion-resisting agent,
The gel breaker of 0.10-0.20%, surplus are water.
Specifically, above-mentioned unconventional low temperature clean fracturing fluid, the thickening agent is mainly prepared by the raw material of following mass ratio
It forms：Acrylamide, sodium acrylate, soda ash, function monomer maleic anhydride, lauroylamidopropyl betaine, initiator and water
Mass ratio is 30:15:7:8:4.5:0.2:44.3.
Specifically, above-mentioned unconventional low temperature clean fracturing fluid, the initiator is potassium peroxydisulfate.
Specifically, above-mentioned unconventional low temperature clean fracturing fluid, the gel breaker is mainly by the original of following mass percent
Material is prepared：Frerrous chloride, ammonium persulfate, hydrogen peroxide and water mass ratio be 15:5:0.03:80.
Specifically, above-mentioned unconventional low temperature clean fracturing fluid, the expansion-resisting agent is mainly prepared by the raw material of following mass ratio
It forms：Sodium chloride, potassium chloride, calcium chloride and water mass ratio be 6:4:5:85.
Specifically, above-mentioned unconventional low temperature clean fracturing fluid, the cleanup additive is mainly prepared by the raw material of following mass ratio
It forms：The mass ratio of alkyl sulfate, sodium carbonate and water is 10:3:87.
Specifically, above-mentioned unconventional low temperature clean fracturing fluid, the crosslinking agent is mainly prepared by the raw material of following mass ratio
It forms：Empgen BB, sodium bicarbonate, ethylene glycol, urea and water mass ratio be 17:3:5.4:4.6:70.
A kind of preparation method of unconventional low temperature clean fracturing fluid above-mentioned, includes the following steps：
(1) cleanup additive, expansion-resisting agent, thickening agent, gel breaker and crosslinking agent are weighed in proportion；
(2) above-mentioned cleanup additive, expansion-resisting agent, thickening agent are slowly added into water under agitation, after being completely dissolved to obtain the final product
To base fluid；
(3) gel breaker is added into above-mentioned base fluid to stir evenly, adds crosslinking agent and stirs evenly to get described unconventional
Low temperature clean fracturing fluid.
Specifically, above-mentioned preparation method, gel breaker is made up of following steps in the step (1), proportionally to water
Middle addition frerrous chloride, ammonium persulfate is added after being completely dissolved, and is completely dissolved after cooling down and hydrogen peroxide is added, mixing, under room temperature
40min is reacted, gel breaker is obtained after complete cooling.
Beneficial effects of the present invention are：
1, cleanup additive and expansion-resisting agent dosage are few in the unconventional low temperature clean fracturing fluid, but clean fracturing is with obvious effects, and
The raw material of the unconventional low temperature clean fracturing fluid is pollution-free, at low cost, and the row of returning leads height.
2, the crosslinking agent of the unconventional low temperature clean fracturing fluid and system compatibility are good, after crosslinking agent is added, system viscosity
Increase apparent.
3, the gel breaker dosage of the unconventional low temperature clean fracturing fluid is few, can be used in a low temperature of 20 DEG C.
4, the base fluid viscosity of the unconventional low temperature clean fracturing fluid is low, is conducive to pumping, residue content is extremely low, with stratum liquid
Compatibility is good, can break glue at low temperature, and broken glue is thorough, and apparent for oil-gas reservoir effect of increasing production, the scope of application is wide, solid-carrying performance
Good, residue content is low, and polymer volume is small.
5, the preparation method of unconventional low temperature clean fracturing fluid provided by the invention is simple with liquid, easy to manufacture, convenient for promoting.
Description of the drawings
Fig. 1 is the broken glue Contrast on effect situation of unconventional low temperature clean fracturing fluid provided by the invention and other fracturing fluids；
Fig. 2 is that static state of the unconventional low temperature clean fracturing fluid provided by the invention under different time hangs sand situation；
Fig. 3 be conventional break liquid prepare fracturing fluid and unconventional low temperature clean fracturing liquid rubber-breaking provided by the invention after
Influence of the liquid to support filling layer.
Specific implementation mode
Below in conjunction with the accompanying drawings and specific embodiment does further explaination to the present invention.
If unspecified, involved in embodiment to fracturing fluid property evaluation experimental condition and experimental method with reference in
Petroleum industry standard《SY/T6376-2008 fracturing fluid general technical specifications》With《SY/T5107-2005 aqueous fracturing fluid performances are commented
Valence method》.
If unspecified, involved in embodiment to " percentage " be mass percent.
If unspecified, involved in embodiment to " part " be mass parts.
Embodiment 1：
(1) synthesis of thickening agent
30kg acrylamides are added in the reaction kettle equipped with 44.3kg water, are completely dissolved, 15kg propylene is slowly added to
Soda ash 7kg, function monomer maleic anhydride 8kg, lauroylamidopropyl betaine is added after being completely dissolved uniformly in sour sodium
4.5kg is slowly added to initiator 0.2kg after it is completely dissolved and temperature is reduced to room temperature in reaction kettle, and initiator is persulfuric acid
Potassium, while being cooled down with circulating chilled water, after all raw materials add, stop after sustained response 6h, colloid product is obtained, to colloid
It is dried, is granulated to get to the thickening agent prepared needed for the unconventional low temperature clean fracturing fluid.
(2) preparation of gel breaker
It by the reducing agent frerrous chloride of 15kg, is dissolved completely in the water of 80kg, the reduction of 5kg is added after the completion of to be dissolved
Agent ammonium persulfate fully dissolves, and the oxidants hydrogen peroxide for being slowly added to 0.03kg after cooling is uniformly mixed in a kettle,
To get to the gel breaker prepared needed for the unconventional low temperature clean fracturing fluid after fully reaction 40min.
(3) preparation of expansion-resisting agent
The expansion-resisting agent is that sodium chloride, potassium chloride, calcium chloride and water press optimal proportion 6:4:5:85 fully dissolving mixing, are used
Sodium carbonate, sodium bicarbonate adjust pH to 6-8 and obtain preparing the expansion-resisting agent needed for the unconventional low temperature clean fracturing fluid.
(4) preparation of cleanup additive
The alkyl sulfate of 10kg and 3kg sodium carbonate are dissolved completely in the water of 87kg, it will reaction after the completion of to be dissolved
Kettle is heated to 50 DEG C of reaction 1-2h, can be obtained the cleanup additive prepared needed for the unconventional low temperature clean fracturing fluid after cooling.
(5) synthesis of crosslinking agent
17kg empgen BBs, 3kg sodium bicarbonate, 5.4kg ethylene glycol and 4.6kg urea are fully dissolved into 70kg's
In water, and blender is started, heating reaction kettle to 55-60 DEG C of fully reaction 4-5h, cooling obtains preparing described unconventional low
Crosslinking agent needed for warm clean fracturing fluid.
(6) prepared by a kind of laboratory of unconventional low temperature clean fracturing fluid
It is calculated by mass percentage, 20 DEG C of unconventional low temperature clean fracturing fluids is prepared in laboratory：Thickening agent dosage is
0.20%, dosage of crosslinking agent 0.20%, cleanup additive 0.20%, expansion-resisting agent 0.20%, gel breaker 0.10%, remaining is
Water.
According to the above ratio, the expansion-resisting agent of 0.20% cleanup additive, 0.20% is added in 99.1% water respectively, is opened
Stirring is slowly added to 0.20% thickening agent, prevents from forming flake, is sufficiently stirred dissolving and obtains low temperature clean fracturing fluid base fluid,
Continue on blender, 0.10% gel breaker be added, then proceed to stirring be slowly added to 0.20% crosslinking agent, crosslinking agent with
Thickening agent presses 1：1 ratio uses most preferably, waits obtaining unconventional low temperature clean fracturing fluid after the completion of being crosslinked.
(7) a kind of unconventional low temperature clean fracturing fluid is prepared in situ
It is calculated by mass percentage, site operation mixing vehicle is sucked cleanup additive, expansion-resisting agent and thickening by corresponding proportion successively
Agent obtains base fluid, is transferred in holding vessel in being sufficiently stirred on liquid distributing vehicle, in construction, sucking base fluid and certain ratio on fracturing blender truck
The gel breaker and a certain proportion of crosslinking agent of example, then can add sand to inject stratum, and whole process can match liquid in construction.
It is above-mentioned it is introduced match liquid proportional, certain adjustment, wherein thickening agent and friendship can be done according to Specific construction temperature
Join the best than being 1 of agent:1, cleanup additive, expansion-resisting agent optimum amount be the gross mass of unconventional low temperature clean fracturing fluid
0.2%, the dosage of gel breaker can carry out preferably optimization according to gel breaking time and use, such as can be unconventional low temperature clean pressure
Split the 0.2% of the gross mass of liquid.
Performance test experiment 1
The purpose of this performance test experiments is to compare unconventional low temperature clean fracturing fluid provided by the invention and other pressures
Split the broken glue effect of liquid.
Unconventional low temperature clean fracturing fluid, wherein thickening agent and dosage of crosslinking agent phase are prepared by the method for above-described embodiment
Together.Using the unconventional low temperature clean fracturing fluid provided by the invention of equivalent and the guar gum fracturing fluid system of equivalent in 20 DEG C of conditions
Broken glue down obtains liquid thoroughly after breaking gel.The results are shown in Figure 1, and in Fig. 1, A indicates that unconventional low temperature provided by the invention is clear
The broken glue effect of clean fracturing fluid, B indicate the broken glue effect of guar gum fracturing fluid.It follows that the unconventional low temperature in Fig. 1 in A is clear
Liquid after clean fracturing liquid rubber-breaking is limpid without apparent residue, and residue content is after breaking gel well below guar gum fracturing fluid in figure B
Level of residue shows that the unconventional low temperature clean fracturing liquid rubber-breaking effect is good, extremely low to the injury of reservoir permeability.
Performance test experiment 2
The purpose of this performance test experiments is to test unconventional low temperature clean fracturing fluid provided by the invention when different
Between under outstanding sand situation.
Unconventional low temperature clean fracturing fluid, wherein thickening agent and dosage of crosslinking agent phase are prepared by the method for above-described embodiment
Together, it is the 0.35% of unconventional low temperature clean fracturing fluid gross mass.Take a certain amount of unconventional low temperature clean provided by the invention
Fracturing fluid tests its outstanding grittiness energy.A, B, C and D are indicated respectively in Fig. 2, under the conditions of 50 DEG C, the unconventional low temperature clean pressure break
Liquid 0,1,2 and 4 hour outstanding sand situation after haydite is added.As shown in Figure 2, haydite showing of not occurring sinking substantially after 4h
As showing that unconventional low temperature clean fracturing fluid static state provided by the invention hangs sand better performances.
Performance test experiment 3
The purpose of this performance test experiments be to compare the residue after breaking gel of conventional fracturing fluid and it is provided by the invention very
Advise influence of the residue after breaking gel of low temperature clean fracturing fluid to support filling layer.
In Fig. 3, left figure (A figures) indicates influence of the residue to support filling layer after breaking gel of guar gum fracturing fluid system, right figure (B
Figure) indicate influence of the residue after breaking gel of the unconventional low temperature clean fracturing fluid to support filling layer.By Fig. 3 comparison it is found that
Minimum on in-place permeability influence after the unconventional low temperature clean fracturing liquid rubber-breaking, residue content is extremely low.
The present invention is not limited to above-mentioned optional embodiment, anyone can show that other are each under the inspiration of the present invention
The product of kind form.Above-mentioned specific implementation mode should not be understood the limitation of pairs of protection scope of the present invention, protection of the invention
Range should be subject to be defined in claims, and specification can be used for interpreting the claims.
Claims (9)
1. a kind of unconventional low temperature clean fracturing fluid, which is characterized in that be mainly prepared by the raw material of following mass percent：
The thickening agent of 0.20-0.35%, the crosslinking agent of 0.20-0.35%, 0.20% cleanup additive, 0.20% expansion-resisting agent, 0.10-
0.20% gel breaker, surplus are water.
2. unconventional low temperature clean fracturing fluid according to claim 1, which is characterized in that the thickening agent is mainly by following
The raw material of mass ratio is prepared：Acrylamide, sodium acrylate, soda ash, function monomer maleic anhydride, dodecanamide propyl beet
The mass ratio of alkali, initiator and water is 30:15:7:8:4.5:0.2:44.3.
3. unconventional low temperature clean fracturing fluid according to claim 2, it is characterised in that：The initiator is persulfuric acid
Potassium.
4. unconventional low temperature clean fracturing fluid according to claim 3, which is characterized in that the gel breaker mainly by with
The raw material of lower mass percent is prepared：Frerrous chloride, ammonium persulfate, hydrogen peroxide and water mass ratio be 15:5:0.03:
80。
5. unconventional low temperature clean fracturing fluid according to claim 4, it is characterised in that：The expansion-resisting agent is mainly by following
The raw material of mass ratio is prepared：Sodium chloride, potassium chloride, calcium chloride and water mass ratio be 6:4:5:85.
6. unconventional low temperature clean fracturing fluid according to claim 5, it is characterised in that：The cleanup additive is mainly by following
The raw material of mass ratio is prepared：The mass ratio of alkyl sulfate, sodium carbonate and water is 10:3:87.
7. unconventional low temperature clean fracturing fluid according to claim 6, it is characterised in that：The crosslinking agent is mainly by following
The raw material of mass ratio is prepared：Empgen BB, sodium bicarbonate, ethylene glycol, urea and water mass ratio be 17:3:5.4:
4.6:70。
8. a kind of preparation method of the unconventional low temperature clean fracturing fluid described in claim 7, which is characterized in that including following step
Suddenly：
(1) cleanup additive, expansion-resisting agent, thickening agent, gel breaker and crosslinking agent are weighed in proportion；
(2) above-mentioned cleanup additive, expansion-resisting agent, thickening agent are slowly added into water under agitation, base is obtained after being completely dissolved
Liquid；
(3) gel breaker is added into above-mentioned base fluid to stir evenly, adds crosslinking agent and stirs evenly to get the unconventional low temperature
Clean fracturing fluid.
9. preparation method according to claim 8, which is characterized in that it includes as follows to prepare gel breaker in the step (1)
Step：Frerrous chloride is proportionally added into water, ammonium persulfate is added after being completely dissolved, peroxide is added after being completely dissolved cooling
Change hydrogen, mixing reacts 40min under room temperature, and gel breaker is obtained after complete cooling.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109705834A (en) * | 2018-12-29 | 2019-05-03 | 山东诺尔生物科技有限公司 | A kind of composition, the temperature-resistant anti-salt fracturing fluid thickener for utilizing the composition preparation and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109705834A (en) * | 2018-12-29 | 2019-05-03 | 山东诺尔生物科技有限公司 | A kind of composition, the temperature-resistant anti-salt fracturing fluid thickener for utilizing the composition preparation and preparation method thereof |
| CN109705834B (en) * | 2018-12-29 | 2021-09-24 | 山东诺尔生物科技有限公司 | Composition, temperature-resistant salt-resistant fracturing fluid thickening agent prepared from composition and preparation method of thickening agent |
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