CN105086990A - Composite acid fracturing working fluid and preparation method thereof - Google Patents
Composite acid fracturing working fluid and preparation method thereof Download PDFInfo
- Publication number
- CN105086990A CN105086990A CN201510320614.2A CN201510320614A CN105086990A CN 105086990 A CN105086990 A CN 105086990A CN 201510320614 A CN201510320614 A CN 201510320614A CN 105086990 A CN105086990 A CN 105086990A
- Authority
- CN
- China
- Prior art keywords
- grams per
- content
- per liter
- working fluid
- hydrochloric acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- C09K8/72—Eroding chemicals, e.g. acids
- C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
-
- 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
- C09K8/72—Eroding chemicals, e.g. acids
- C09K8/725—Compositions containing polymers
-
- 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
- C09K8/882—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
-
- 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
-
- 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
- C09K2208/32—Anticorrosion additives
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention provides composite acid fracturing working fluid. The fluid is composed of the following raw materials: with volume of a hydrochloric acid solution as datum, 8 to 20 gram/litre of a thickening agent, 8 to 20 gram/litre of a crosslinking agent, 4 to 10 gram/litre of a conditioner, 5 to 25 gram/litre of a high-temperature corrosion inhibitor, 8 to 20 gram/litre of a demulsifier, 10 to 25 gram/litre of a discharge aiding agent, 4 to 15 gram/litre of an iron ion stabilizer and 0.3 to 0.8 gram/litre of a gel breaker, wherein a mass percentage of the hydrochloric acid solution is 13 to 20%. The invention also provides a preparation method for the composite acid fracturing working fluid. The method comprises the following steps: according to proportion, successively adding the high-temperature corrosion inhibitor, the thickening agent, the demulsifier, the discharge aiding agent and the iron ion stabilizer into the hydrochloric acid solution so as to obtain a first mixed solution; then mixing the conditioner and the crosslinking agent according to a volume ratio of 0.5 to 1 so as to obtain a second mixed solution; then mixing the first mixed solution and the second mixed solution; and finally, adding the gel breaker. The working fluid provided by the invention has good sand-carrying performance, easy flowback and low harmfulness.
Description
Technical field
The present invention relates to oilfield reservoir renovation technique field, particularly, relate to a kind of compound acid fracturing working fluid and preparation method thereof.
Background technology
Compound acid fracturing yield-increasing technology mainly for carbonate reservoir, be by the acid that becomes sticky, common acid, kinds of processes form is combined, to improve sour effect to turn to multiple acid fluid system or the pressure breaks such as acid, acid fracturing, equilibrium acidization closed etc.
About Compound-acid compression technology, its major measure has following several: 1. become sticky sour compound ACID FRACTURING TECHNOLOGY; 2. visco-elastic surfactant acid adds conventional acid compound ACID FRACTURING TECHNOLOGY; 3. multipulse loading+ACID FRACTURING TECHNOLOGY; 4. equilibrium acidization+closed acidization technology; 5. pressure break+acid fracturing recombining process etc.But existing Compound-acid compression technology all can not meet the requirement realizing preferably reservoir reconstruction effect.
During acid fracturing, gel acid mainly advances along filling seam, react with the carbonatite of slotted wall, filling seam can be widened on the one hand, its flow conductivity of further enhancing, filling seam and stratum natural fracture can be linked up on the other hand, the probability that increase man-made fracture and stratum major fracture meet, expands the span of control of man-made fracture.Meanwhile, acid solution and formation rock react and produce a large amount of CO
2gas, the raffinate be conducive in man-made fracture returns row.These two kinds of techniques play respective feature, organically combine, synergy.Based on this, be necessary to invent the reservoir reconstruction effect that a kind of acid cross-linked fracturing liquid reaches the best.
Summary of the invention
Technical problem to be solved by this invention is: for the defect existed in prior art, provides the compound acid fracturing working fluid that a kind of resistance to elevated temperatures is good, low to reservoir damage.
On the one hand, the invention provides a kind of compound acid fracturing working fluid, described compound acid fracturing working fluid comprises hydrochloric acid soln, viscosifying agent, linking agent, amendment, high-temperature corrosion inhibitor, emulsion splitter, cleanup additive, Fe stabilizer and gel breaker;
Wherein, with the volume of hydrochloric acid soln for benchmark, viscosifying agent content is 8-20 grams per liter, content of crosslinking agent is 8-20 grams per liter, and amendment content is 4-10 grams per liter, and high-temperature corrosion inhibitor content is 5-25 grams per liter, emulsion splitter content is 8-20 grams per liter, cleanup additive content is 10-25 grams per liter, and Fe stabilizer content is 4-15 grams per liter, and content of gel breaker is 0.3-0.8 grams per liter; Wherein, the massfraction of hydrochloric acid soln is 13-20%, is preferably 20%.
Aforesaid compound acid fracturing working fluid, described compound acid fracturing working fluid comprises hydrochloric acid soln, viscosifying agent, linking agent, amendment, high-temperature corrosion inhibitor, emulsion splitter, cleanup additive, Fe stabilizer and gel breaker;
Wherein, with the volume of hydrochloric acid soln for benchmark, viscosifying agent content is 8-12 grams per liter, content of crosslinking agent is 10-15 grams per liter, and amendment content is 5-8 grams per liter, and high-temperature corrosion inhibitor content is 10-20 grams per liter, emulsion splitter content is 10-15 grams per liter, cleanup additive content is 12-20 grams per liter, and Fe stabilizer content is 5-12 grams per liter, and content of gel breaker is 0.4-0.6 grams per liter;
Preferably, with the volume of hydrochloric acid soln for benchmark, viscosifying agent content is 10 grams per liters, content of crosslinking agent is 12 grams per liters, and amendment content is 6 grams per liters, and high-temperature corrosion inhibitor content is 15 grams per liters, emulsion splitter content is 12 grams per liters, cleanup additive content is 15 grams per liters, and Fe stabilizer content is 10 grams per liters, and content of gel breaker is 0.5 grams per liter.
Aforesaid compound acid fracturing working fluid, described viscosifying agent is vinyl polymer, acrylamide copolymer or cross-linked polyacrylamide polymkeric substance, preferably cross-linked polyacrylamide polymkeric substance.
Aforesaid compound acid fracturing working fluid, described linking agent is chelate crosslinking agent, low molecule aldehydes or oligomeric phenolphthalein resin, preferably low molecule aldehydes.
Aforesaid compound acid fracturing working fluid, described emulsion splitter is polyethers cross-linked polymer emulsion splitter, carboxylamine lipid emulsion splitter or polyphosphoric acid ester type emulsion splitter, preferably polyphosphoric acid ester type emulsion splitter.
Aforesaid compound acid fracturing working fluid, described cleanup additive is cationic surfactant cleanup additive or nonionic surface active agent cleanup additive, preferably nonionic surface active agent cleanup additive.
Aforesaid compound acid fracturing working fluid, the temperature resistant capability of described compound acid fracturing working fluid reaches 155 DEG C.
On the other hand, a kind of preparation method of compound acid fracturing working fluid, comprises the steps:
(1) add 8-20 gram of viscosifying agent according to often liter of hydrochloric acid soln, viscosifying agent being dissolved in massfraction is in the hydrochloric acid soln of 13-20%, stirs; In whipping process, the ratio of 5-25 gram of high-temperature corrosion inhibitor, 8-20 gram emulsion splitter, 10-25 gram cleanup additive and 4-15 gram of Fe stabilizer is added according to often liter of hydrochloric acid soln, add high-temperature corrosion inhibitor, emulsion splitter, cleanup additive and Fe stabilizer successively, place after stirring and obtain the first mixing solutions;
(2) by amendment and linking agent by volume 0.5-1 carry out being mixed to get the second mixing solutions;
(3) account for the weight ratio of total solution with the second mixing solutions for 1.0-1.5%, the second mixing solutions is joined in the first mixing solutions, stirs.
(4) finally gel breaker is added;
Wherein, the massfraction of hydrochloric acid soln is 13-20%, is preferably 20%; With the volume of hydrochloric acid soln for benchmark, the amendment added is 4-10 grams per liter, and the linking agent added is 8-20 grams per liter, and the gel breaker added is 0.3-0.8 grams per liter.
Aforesaid preparation method, in step (1), adds 8-12 gram of (preferably 10 grams) viscosifying agent according to often liter of hydrochloric acid soln, is dissolved in hydrochloric acid soln by viscosifying agent.
Aforesaid preparation method, in step (1), in whipping process, add the ratio of 10-20 gram of high-temperature corrosion inhibitor, 10-15 gram emulsion splitter, 12-20 gram cleanup additive and 5-12 gram of Fe stabilizer according to often liter of hydrochloric acid soln, add high-temperature corrosion inhibitor, emulsion splitter, cleanup additive and Fe stabilizer successively;
Preferably, add the ratio of 15 grams of high-temperature corrosion inhibitors, 12 grams of emulsion splitters, 15 grams of cleanup additives and 10 grams of Fe stabilizeies according to often liter of hydrochloric acid soln, add high-temperature corrosion inhibitor, emulsion splitter, cleanup additive and Fe stabilizer successively.
Aforesaid preparation method, with the volume of hydrochloric acid soln for benchmark, the amendment added is 5-8 grams per liter, and the linking agent added is 10-15 grams per liter, and the gel breaker added is 0.4-0.6 grams per liter; Preferably, with the volume of hydrochloric acid soln for benchmark, the amendment added is 6 grams per liters, and the linking agent added is 12 grams per liters, and the gel breaker added is 0.5 grams per liter.
Aforesaid preparation method, in step (1), places after stirring and obtains the first mixing solutions in more than 1 hour.
Aforesaid preparation method, described linking agent is chelate crosslinking agent, low molecule aldehydes or oligomeric phenolphthalein resin, preferably low molecule aldehydes.
Aforesaid compound acid fracturing working fluid, described viscosifying agent is vinyl polymer, acrylamide copolymer or cross-linked polyacrylamide polymkeric substance, preferably cross-linked polyacrylamide polymkeric substance.
Aforesaid compound acid fracturing working fluid, described linking agent is chelate crosslinking agent, low molecule aldehydes, oligomeric phenolphthalein resin or phenol-gum resin, preferably low molecule aldehydes.
Aforesaid compound acid fracturing working fluid, described emulsion splitter polyethers cross-linked polymer emulsion splitter, carboxylamine lipid emulsion splitter or polyphosphoric acid ester type emulsion splitter, preferably polyphosphoric acid ester type emulsion splitter.
Aforesaid compound acid fracturing working fluid, is characterized in that, described cleanup additive is cationic surfactant cleanup additive or nonionic surface active agent cleanup additive, preferably nonionic surface active agent cleanup additive.
Technical scheme of the present invention is adopted at least to have following beneficial effect: owing to have employed preferred viscosifying agent, acid solution linking agent achieves the crosslinked of acid solution under normal temperature condition.Further, each component is undertaken combining by specific proportioning thus is achieved collaborative effect.This compound acid fracturing working liquid cording has high temperature resistant and endurance of cutting and extremely low erosion rate preferably, at 155.0 DEG C, 170S
-1, after continuous shear stress 100mins viscosity still>=50mPas, erosion rate is only 1.2g/m
2h-1.5g/m
2h, and the characteristic having that crosslinking degree constantly strengthens under certain temperature condition, thus in the process injected along shaft column, acid solution is constantly heated, thus has delayed crosslinked characteristic and lower injection frictional resistance.Secondly, described cross-linked acid viscosifying agent and cross-linked acid amendment (auxiliary crosslinking agent), cross-linked acid cross-linking agent, inhibiter, cleanup additive, emulsion splitter and the Fe stabilizer interfacial tension acting on the fracturing fluid system formed that cooperatively interacts is 15-20mN/m, breaking glue solution viscosity is less than 8mPas, the easily row of returning, have low damage, it is only 10%-15% to the injury rate of carbonate reservoir.
Accompanying drawing explanation
Fig. 1 is the variation diagram of of the fracturing fluid viscosity with shear time of embodiment 2, embodiment 3 and comparative example 1 preparation, wherein,
for the viscosity of working fluid under different shear time prepared by comparative example 1;
for the viscosity of working fluid under different shear time prepared by embodiment 3;
for the viscosity of working fluid under different shear time prepared by embodiment 2.
Fig. 2 liquid viscosity that to be embodiment 4 prepare with embodiment 5 with the variation diagram of broken glue time, wherein,
the working fluid prepared for embodiment 4 to break the viscosity under the glue time in difference;
the working fluid prepared for embodiment 5 to break the viscosity under the glue time in difference.
Embodiment
In order to fully understand object of the present invention, feature and effect, by following embodiment, the present invention is elaborated.Processing method of the present invention is except following content, and all the other all adopt ordinary method or the device of this area.
On the one hand, the invention provides a kind of compound acid fracturing working fluid, this compound acid fracturing working fluid comprises hydrochloric acid soln, viscosifying agent, linking agent, high-temperature corrosion inhibitor, emulsion splitter, cleanup additive, Fe stabilizer and gel breaker;
Wherein, with the volume of hydrochloric acid soln for benchmark, viscosifying agent content is 8-20 grams per liter, content of crosslinking agent is 8-20 grams per liter, and amendment content is 4-10 grams per liter, and high-temperature corrosion inhibitor content is 5-25 grams per liter, emulsion splitter content is 8-20 grams per liter, cleanup additive content is 10-25 grams per liter, and Fe stabilizer content is 4-15 grams per liter, and content of gel breaker is 0.3-0.8 grams per liter; Wherein, the massfraction of hydrochloric acid soln is 13-20%, is preferably 20%.
Preferably, with the volume of hydrochloric acid soln for benchmark, viscosifying agent content is 8-12 grams per liter, content of crosslinking agent is 10-15 grams per liter, and amendment content is 5-8 grams per liter, and high-temperature corrosion inhibitor content is 10-20 grams per liter, emulsion splitter content is 10-15 grams per liter, cleanup additive content is 12-20 grams per liter, and Fe stabilizer content is 5-12 grams per liter, and content of gel breaker is 0.4-0.6 grams per liter.
More preferably, with the volume of hydrochloric acid soln for benchmark, viscosifying agent content is 10 grams per liters, content of crosslinking agent is 12 grams per liters, and amendment content is 6 grams per liters, and high-temperature corrosion inhibitor content is 15 grams per liters, emulsion splitter content is 12 grams per liters, cleanup additive content is 15 grams per liters, and Fe stabilizer content is 10 grams per liters, and content of gel breaker is 0.5 grams per liter.
Above-mentioned viscosifying agent is vinyl polymer, acrylamide copolymer or cross-linked polyacrylamide polymkeric substance, and preferably, above-mentioned viscosifying agent is cross-linked polyacrylamide polymkeric substance.
Acrylamide copolymer molecular weight is 5 × 10
6~ 7 × 10
6, repeated structural unit is polyacrylamide, formaldehyde, dimethylamine, and ratio during copolymerization is PAM:HCHO:(CH
3)
2nH=1:1:2, specifically can be Poly Dimethyl Diallyl Ammonium Chloride, dimethyl polyacrylamide;
Vinyl polymer, with dioxy cycloalkanes alkene (I) and ethene for comonomer, dioxy cycloalkanes alkene (I) is 6% with the massfraction of dioxy cycloalkanes alkene (I) in the multipolymer of ethene.The structural formula of vinyl polymer is as figure below.It can be such as polyesters polyolefins.
Cross-linked polyacrylamide polymkeric substance, using acrylamide (AM), acrylyl oxy-ethyl-trimethyl salmiac (AETMAC), 2-acrylamide-2-methylpro panesulfonic acid (AMPS) as comonomer, NEW TYPE OF COMPOSITE redox system is adopted to cause AM and AETMAC or AMPS copolymerization, relative molecular mass (>=1.0 × 10
7), can be such as AM/AETMAC copolymer.
Above-mentioned linking agent is chelate crosslinking agent (such as, as chromium acetate, Tiorco 677 etc.), low molecule aldehydes (such as formaldehyde, oxalic dialdehyde etc.), oligomeric phenolphthalein resin, preferably low molecule aldehydes.
Wherein, oligomeric phenolphthalein resin is at an alkali metal salt (K
2cO
3/ H
2o) under catalysis, with phenolphthalein (PPH) and epoxy chloropropane (ECH) for comonomer, PPH: ECH: K
2cO
3ratio be 1: 4: 2, as lower molecular weight phenolphthalein epoxy resin.
Above-mentioned emulsion splitter is that (it take monohydroxy-alcohol as initiator to polyethers cross-linked polymer emulsion splitter, and repeating unit is oxyethane and propylene oxide, as stearyl alcohol polyethers C
18h
37o (PO)
n(EO)
m(PO)
g, molecular weight is 2000 ~ 10000, as the SP type crude oil demulsifier SP-169 that China produces), carboxylamine lipid emulsion splitter or nonionogenic tenside, preferably nonionogenic tenside.In this area, the conventional nonionogenic tenside used all can be used in the present invention.
Above-mentioned cleanup additive be cationic surfactant cleanup additive (such as, quaternary ammonium salt cationic surfactant, diethanolamine) or nonionic surface active agent cleanup additive is (such as, polyethylene glycol type nonionogenic tenside, polyoxyethylene carboxylate), preferably nonionic surface active agent cleanup additive.
Conventional Fe stabilizer all can be applicable in compound acid fracturing working fluid of the present invention, and preferably, Fe stabilizer is citric acid or xitix, and is more preferably xitix.
Conventional gel breaker all can be applicable in compound acid fracturing working fluid of the present invention, and preferably, gel breaker is ammonium persulphate or Sodium tetrafluoroborate, and is more preferably Sodium tetrafluoroborate.
The high-temperature corrosion inhibitor of conventional commercial all can be applicable in compound acid fracturing working fluid of the present invention, such as, Yadong, Puyang oilfield of Henan chemical company produce FZ-02 model inhibiter (water-soluble mercapto benzothiazole), Beijing Ke Maishi company produce KMS-6 model inhibiter or Beijing FRAC company produce FK-1 model inhibiter (Mannich bases).
On the other hand, present invention also offers the preparation method of above-mentioned compound acid fracturing working fluid, comprise the steps:
(1) preparing mass percentage concentration is the hydrochloric acid soln of 13-20%, and add 8-20 gram of viscosifying agent (preferred 8-12 gram according to often liter of hydrochloric acid soln, more preferably 10 grams), viscosifying agent is dissolved in the hydrochloric acid soln of preparation, stir, general stirring 20-50 minute, preferably 30 minutes.
Preferably, mass percentage concentration is adopted to be that the analytical pure hydrochloric acid of 36-38% is to prepare the hydrochloric acid soln that above-mentioned mass percentage concentration is 13-20%.
In whipping process, the ratio of 5-25 gram of high-temperature corrosion inhibitor, 8-20 gram emulsion splitter, 10-25 gram cleanup additive and 4-15 gram of Fe stabilizer is added according to often liter of hydrochloric acid soln, add high-temperature corrosion inhibitor, emulsion splitter, cleanup additive and Fe stabilizer successively, general placement more than 1 hour is to make bubble-free in the first mixing solutions.
Preferably, in whipping process, add the ratio of 10-20 gram of high-temperature corrosion inhibitor, 10-15 gram emulsion splitter, 12-20 gram cleanup additive and 5-12 gram of Fe stabilizer according to often liter of hydrochloric acid soln, add high-temperature corrosion inhibitor, emulsion splitter, cleanup additive and Fe stabilizer successively; More preferably, add the ratio of 15 grams of high-temperature corrosion inhibitors, 12 grams of emulsion splitters, 15 grams of cleanup additives and 10 grams of Fe stabilizeies according to often liter of hydrochloric acid soln, add high-temperature corrosion inhibitor, emulsion splitter, cleanup additive and Fe stabilizer successively.
(2) by frozen glue acid amendment and linking agent by volume 0.5-1 carry out being mixed to get the second mixing solutions.
(3) account for the weight ratio of total solution with the second mixing solutions for 1.0-1.5%, the second mixing solutions is joined in the first mixing solutions, stirs.
(4) finally gel breaker is added.
Above-mentioned steps (2) is in (4), and with the volume of hydrochloric acid soln for benchmark, the amendment added is 4-10 grams per liter, and the linking agent added is 8-20 grams per liter, and the gel breaker added is 0.3-0.8 grams per liter; Preferably, with the volume of hydrochloric acid soln for benchmark, the amendment added is 5-8 grams per liter, and the linking agent added is 10-15 grams per liter, and the gel breaker added is 0.4-0.6 grams per liter; More preferably, with the volume of hydrochloric acid soln for benchmark, the amendment added is 6 grams per liters, and the linking agent added is 12 grams per liters, and the gel breaker added is 0.5 grams per liter.
Compound acid fracturing working fluid of the present invention can be applicable to, in the volume increase of carbonatite compound acid fracturing, solve a difficult problem for existing compound acid fracturing stimulation fluids body aspect of performance.The compound acid fracturing working liquid cording of this method of design has high temperature resistant and endurance of cutting and extremely low erosion rate preferably, and there is the characteristic that crosslinking degree constantly strengthens under certain temperature condition, thus in the process injected along shaft column, acid solution is constantly heated, thus has delayed crosslinked characteristic and lower injection frictional resistance.Secondly, described cross-linked acid viscosifying agent and cross-linked acid amendment (i.e. amendment, for auxiliary crosslinking agent), cross-linked acid cross-linking agent, inhibiter, cleanup additive, emulsion splitter and Fe stabilizer cooperatively interact act on the fracturing liquid formed take grittiness can good, easily the row of returning, there is low damage.
Further illustrate the present invention below by embodiment, but protection scope of the present invention is not limited to specific embodiment.
Embodiment
First be described raw materials used in embodiment:
Embodiment 1
Get 500ml beaker a certain amount of amendment and linking agent are mixed by the volume ratio of 2:1, stir, obtain crosslinker compounding system.
Embodiment 2
Functional quality concentration be 38% hydrochloric acid preparation massfraction be 20% hydrochloric acid soln 1 liter, add 10g viscosifying agent, 10g high-temperature corrosion inhibitor, 10g emulsion splitter, 10g cleanup additive, 10g Fe stabilizer wherein successively.Stir, when bubble-free, add composite cross linker system prepared by 12g embodiment 1, stir, make it abundant dissolving, be cross-linked, form compound acid fracturing working fluid.In the compound acid fracturing working fluid formed, viscosifying agent accounts for 1.0% of clear water quality, high-temperature corrosion inhibitor accounts for 1.0% of clear water quality, emulsion splitter accounts for 1.0% of clear water quality, cleanup additive accounts for 1.0% of clear water quality, Fe stabilizer accounts for 1.0% of clear water quality, and crosslinker compounding system accounts for 1.2% of clear water quality.
Embodiment 3
Functional quality concentration be 38% hydrochloric acid preparation massfraction be 13% hydrochloric acid soln 1 liter, add 12g viscosifying agent, 10g high-temperature corrosion inhibitor, 10g emulsion splitter, 10g cleanup additive, 10g Fe stabilizer wherein successively.Stir, when bubble-free, add composite cross linker system prepared by 10g embodiment 1, stir, make it abundant dissolving, be cross-linked, form compound acid fracturing working fluid.In the compound acid fracturing working fluid formed, viscosifying agent accounts for 1.2% of clear water quality, high-temperature corrosion inhibitor accounts for 1.0% of clear water quality, emulsion splitter accounts for 1.0% of clear water quality, cleanup additive accounts for 1.0% of clear water quality, Fe stabilizer accounts for 1.0% of clear water quality, and crosslinker compounding system accounts for 1.0% of clear water quality.
Embodiment 4
In the compound acid fracturing working fluid that embodiment 2 is obtained, add 0.03wt% gel breaker (add-on 0.3g).
Embodiment 5
In the compound acid fracturing working fluid that embodiment 2 is obtained, add 0.06wt% gel breaker (add-on 0.6g).
Embodiment 6
Functional quality concentration be 38% hydrochloric acid preparation massfraction be 16% hydrochloric acid soln 1 liter, add 9g viscosifying agent, 12g high-temperature corrosion inhibitor, 10g emulsion splitter, 10g cleanup additive, 8g Fe stabilizer wherein successively.Stir, when bubble-free, add composite cross linker system prepared by 10g embodiment 1, stir, make it abundant dissolving, be cross-linked, form compound acid fracturing working fluid.In the compound acid fracturing working fluid formed, viscosifying agent accounts for 0.9% of clear water quality, high-temperature corrosion inhibitor accounts for 1.2% of clear water quality, emulsion splitter accounts for 1.0% of clear water quality, cleanup additive accounts for 1.0% of clear water quality, Fe stabilizer accounts for 0.8% of clear water quality, and crosslinker compounding system accounts for 1.0% of clear water quality.
Comparative example 1
Functional quality concentration be 38% hydrochloric acid preparation massfraction be 20% hydrochloric acid soln 1 liter, add 10g viscosifying agent, 10g high-temperature corrosion inhibitor, 10g emulsion splitter, 10g cleanup additive, 10g Fe stabilizer wherein successively.Stir, when bubble-free, add composite cross linker system prepared by 10g embodiment 1, stir, make it abundant dissolving, be cross-linked, form compound acid fracturing working fluid.In the compound acid fracturing working fluid formed, viscosifying agent accounts for 1.0% of clear water quality, high-temperature corrosion inhibitor accounts for 1.0% of clear water quality, emulsion splitter accounts for 1.0% of clear water quality, cleanup additive accounts for 1.0% of clear water quality, Fe stabilizer accounts for 1.0% of clear water quality, and crosslinker compounding system accounts for 1.0% of clear water quality.
Test the rheological of the compound acid fracturing working fluid obtained, result is the variation diagram of of the fracturing fluid viscosity with shear time of embodiment 2, embodiment 3 and comparative example 1 preparation see Fig. 1, Fig. 1, and wherein probe temperature is 150 DEG C, and shearing rate is 170s
-1.As shown in Figure 1, compound acid fracturing working fluid of the present invention has good rheological at 150 DEG C.Along with the increase of linking agent dosage, the final stable viscosity of working fluid system also increases thereupon.
Test the reservoir protection performance of the compound acid fracturing working fluid obtained, result is see table 1, and table 1 working fluid that to be embodiment 2 prepare with comparative example 1 is to the injury data of carbonatite rock core.As shown in Table 1, the nocuity of compound acid fracturing working fluid of the present invention to carbonate reservoir is little, effectively can reduce the injury to reservoir.
Table 1 compound acid fracturing working fluid is to core damage experiment
Test the erosion rate of the compound acid fracturing working fluid obtained, result is see table 2, and table 2 working fluid that to be embodiment 2 prepare with comparative example 1 is to the etch rate data of steel disc.As shown in Table 2, the erosion rate of compound acid fracturing working fluid of the present invention is very little, effectively can reduce the injury to tubing string.
Table 2 compound acid fracturing working fluid erosion rate test experiments
Embodiment 4 and embodiment 5 are obtained liquid to be respectively charged in encloses container, and then put into thermostatted and heat, temperature is 90 DEG C.Make fracturing liquid broken glue under thermostat temperature, then get its clear liquid and measure viscosity.Result is see the variation diagram of Fig. 2, Fig. 2 liquid viscosity that to be embodiment 4 prepare with embodiment 5 with the broken glue time.As shown in Figure 2, Sodium tetrafluoroborate has broken colloidality preferably to compound acid fracturing working fluid of the present invention.Along with the increase of gel breaker dosage, broken glue required time and liquid viscosity reduce all accordingly, and because broken glue is very fast, during rig-site utilization, suggestion uses capsule breaker.
The each 500ml of fracturing liquid embodiment 2, embodiment 3, embodiment 6 and comparative example 1 prepared is loaded in graduated cylinder respectively, respectively 9 20/40 object cards are won haydite and be dispersed in fracturing liquid surface, then measure the settling velocity of a wherein more uniform haydite of settling ratio, result is see table 3.
The of the fracturing fluid subsidence rate of table 3 compares
To the size of fracturing liquid static suspension ability, usually represent by the free falling velocity of proppant particles in fracturing liquid, best single particle settling velocity <0.08mm/s.
As shown in Table 3, compound acid fracturing working fluid of the present invention greatly reduces the subsidence rate of propping agent, enhances prop-carrying capacity.
To the above-mentioned explanation of the disclosed embodiments, those skilled in the art are realized or uses the present invention.To be apparent for a person skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (19)
1. a compound acid fracturing working fluid, is characterized in that, described compound acid fracturing working fluid comprises hydrochloric acid soln, viscosifying agent, linking agent, amendment, high-temperature corrosion inhibitor, emulsion splitter, cleanup additive, Fe stabilizer and gel breaker;
Wherein, with the volume of hydrochloric acid soln for benchmark, viscosifying agent content is 8-20 grams per liter, content of crosslinking agent is 8-20 grams per liter, and amendment content is 4-10 grams per liter, and high-temperature corrosion inhibitor content is 5-25 grams per liter, emulsion splitter content is 8-20 grams per liter, cleanup additive content is 10-25 grams per liter, and Fe stabilizer content is 4-15 grams per liter, and content of gel breaker is 0.3-0.8 grams per liter; Wherein, the massfraction of hydrochloric acid soln is 13-20%, is preferably 20%.
2. compound acid fracturing working fluid according to claim 1, is characterized in that, described compound acid fracturing working fluid comprises hydrochloric acid soln, viscosifying agent, linking agent, amendment, high-temperature corrosion inhibitor, emulsion splitter, cleanup additive, Fe stabilizer and gel breaker;
Wherein, with the volume of hydrochloric acid soln for benchmark, viscosifying agent content is 8-12 grams per liter, content of crosslinking agent is 10-15 grams per liter, and amendment content is 5-8 grams per liter, and high-temperature corrosion inhibitor content is 10-20 grams per liter, emulsion splitter content is 10-15 grams per liter, cleanup additive content is 12-20 grams per liter, and Fe stabilizer content is 5-12 grams per liter, and content of gel breaker is 0.4-0.6 grams per liter.
3. compound acid fracturing working fluid according to claim 2, is characterized in that, described compound acid fracturing working fluid comprises hydrochloric acid soln, viscosifying agent, linking agent, amendment, high-temperature corrosion inhibitor, emulsion splitter, cleanup additive, Fe stabilizer and gel breaker;
Wherein, with the volume of hydrochloric acid soln for benchmark, viscosifying agent content is 10 grams per liters, content of crosslinking agent is 12 grams per liters, and amendment content is 6 grams per liters, and high-temperature corrosion inhibitor content is 15 grams per liters, emulsion splitter content is 12 grams per liters, cleanup additive content is 15 grams per liters, and Fe stabilizer content is 10 grams per liters, and content of gel breaker is 0.5 grams per liter.
4. the compound acid fracturing working fluid according to any one of claim 1-3, is characterized in that, described viscosifying agent is vinyl polymer, acrylamide copolymer or cross-linked polyacrylamide polymkeric substance, preferably cross-linked polyacrylamide polymkeric substance.
5. the compound acid fracturing working fluid according to any one of claim 1-4, is characterized in that, described linking agent is chelate crosslinking agent, low molecule aldehydes or oligomeric phenolphthalein resin, preferably low molecule aldehydes.
6. the compound acid fracturing working fluid according to any one of claim 1-5, is characterized in that, described emulsion splitter is polyethers cross-linked polymer emulsion splitter, carboxylamine lipid emulsion splitter or polyphosphoric acid ester type emulsion splitter, preferably polyphosphoric acid ester type emulsion splitter.
7. the compound acid fracturing working fluid according to any one of claim 1-6, is characterized in that, described cleanup additive is cationic surfactant cleanup additive or nonionic surface active agent cleanup additive, preferably nonionic surface active agent cleanup additive.
8. the compound acid fracturing working fluid according to any one of claim 1-7, is characterized in that, the temperature resistant capability of described compound acid fracturing working fluid reaches 155 DEG C.
9. a preparation method for compound acid fracturing working fluid, is characterized in that, comprises the steps:
(1) add 8-20 gram of viscosifying agent according to often liter of hydrochloric acid soln, viscosifying agent being dissolved in massfraction is in the hydrochloric acid soln of 13-20%, stirs; In whipping process, the ratio of 5-25 gram of high-temperature corrosion inhibitor, 8-20 gram emulsion splitter, 10-25 gram cleanup additive and 4-15 gram of Fe stabilizer is added according to often liter of hydrochloric acid soln, add high-temperature corrosion inhibitor, emulsion splitter, cleanup additive and Fe stabilizer successively, place after stirring and obtain the first mixing solutions;
(2) by amendment and linking agent by volume 0.5-1 carry out being mixed to get the second mixing solutions;
(3) account for the weight ratio of total solution with the second mixing solutions for 1.0-1.5%, the second mixing solutions is joined in the first mixing solutions, stirs.
(4) finally gel breaker is added;
Wherein, the massfraction of hydrochloric acid soln is 13-20%, is preferably 20%; With the volume of hydrochloric acid soln for benchmark, the amendment added is 4-10 grams per liter, and the linking agent added is 8-20 grams per liter, and the gel breaker added is 0.3-0.8 grams per liter.
10. preparation method according to claim 9, is characterized in that, in step (1), adds 8-12 gram of (preferably 10 grams) viscosifying agent, be dissolved in hydrochloric acid soln by viscosifying agent according to often liter of hydrochloric acid soln.
11. preparation methods according to claim 9 or 10, it is characterized in that, in step (1), in whipping process, add the ratio of 10-20 gram of high-temperature corrosion inhibitor, 10-15 gram emulsion splitter, 12-20 gram cleanup additive and 5-12 gram of Fe stabilizer according to often liter of hydrochloric acid soln, add high-temperature corrosion inhibitor, emulsion splitter, cleanup additive and Fe stabilizer successively.
12. preparation methods according to claim 11, it is characterized in that, in step (1), in whipping process, add the ratio of 15 grams of high-temperature corrosion inhibitors, 12 grams of emulsion splitters, 15 grams of cleanup additives and 10 grams of Fe stabilizeies according to often liter of hydrochloric acid soln, add high-temperature corrosion inhibitor, emulsion splitter, cleanup additive and Fe stabilizer successively.
13. preparation methods according to any one of claim 9-12, it is characterized in that, with the volume of hydrochloric acid soln for benchmark, the amendment added is 5-8 grams per liter, and the linking agent added is 10-15 grams per liter, and the gel breaker added is 0.4-0.6 grams per liter; Preferably, with the volume of hydrochloric acid soln for benchmark, the amendment added is 6 grams per liters, and the linking agent added is 12 grams per liters, and the gel breaker added is 0.5 grams per liter.
14. preparation methods according to any one of claim 9-13, is characterized in that, in step (1), place and obtain the first mixing solutions in more than 1 hour after stirring.
15. preparation methods according to any one of claim 9-14, it is characterized in that, described linking agent is chelate crosslinking agent, low molecule aldehydes or oligomeric phenolphthalein resin, preferably low molecule aldehydes.
16. compound acid fracturing working fluids according to any one of claim 9-15, it is characterized in that, described viscosifying agent is vinyl polymer, acrylamide copolymer or cross-linked polyacrylamide polymkeric substance, preferably cross-linked polyacrylamide polymkeric substance.
17. compound acid fracturing working fluids according to any one of claim 9-16, it is characterized in that, described linking agent is chelate crosslinking agent, low molecule aldehydes, oligomeric phenolphthalein resin or phenol-gum resin, preferably low molecule aldehydes.
18. compound acid fracturing working fluids according to any one of claim 9-17, is characterized in that, described emulsion splitter polyethers cross-linked polymer emulsion splitter, carboxylamine lipid emulsion splitter or polyphosphoric acid ester type emulsion splitter, preferably polyphosphoric acid ester type emulsion splitter.
19. compound acid fracturing working fluids according to any one of claim 9-18, it is characterized in that, described cleanup additive is cationic surfactant cleanup additive or nonionic surface active agent cleanup additive, preferably nonionic surface active agent cleanup additive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510320614.2A CN105086990A (en) | 2015-06-11 | 2015-06-11 | Composite acid fracturing working fluid and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510320614.2A CN105086990A (en) | 2015-06-11 | 2015-06-11 | Composite acid fracturing working fluid and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105086990A true CN105086990A (en) | 2015-11-25 |
Family
ID=54568340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510320614.2A Pending CN105086990A (en) | 2015-06-11 | 2015-06-11 | Composite acid fracturing working fluid and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105086990A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108822827A (en) * | 2018-07-21 | 2018-11-16 | 东营市宝泽能源科技有限公司 | A kind of superhigh temperature cross-linked acid |
| CN108913119A (en) * | 2018-07-21 | 2018-11-30 | 东营市宝泽能源科技有限公司 | A kind of pressure break thickening agent and preparation method thereof |
| CN110156617A (en) * | 2019-06-12 | 2019-08-23 | 中国石油化工股份有限公司 | A kind of preparation method and applications of corrosion inhibiter |
| CN110628410A (en) * | 2019-10-16 | 2019-12-31 | 北京弘毅恩泽能源技术有限公司 | High-temperature-resistant cross-linked acid system for acid fracturing and preparation method thereof |
| CN111849454A (en) * | 2020-07-14 | 2020-10-30 | 东方宝麟科技发展(北京)有限公司 | Soluble bridge plug dissolution assisting system and shale gas horizontal well soluble bridge plug dissolution assisting card process |
| CN115488986A (en) * | 2022-09-26 | 2022-12-20 | 徐州安联木业有限公司 | Flame-retardant waterproof type recyclable environment-friendly plate |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5238067A (en) * | 1992-05-18 | 1993-08-24 | Mobil Oil Corporation | Improved means of fracture acidizing carbonate formations |
| CN102277152A (en) * | 2011-05-16 | 2011-12-14 | 陕西科技大学 | Acid-triggered thickening agent and preparation method thereof |
| CN102516976A (en) * | 2011-11-11 | 2012-06-27 | 中国石油天然气集团公司 | Preparation method of multi-component organic cross-linked acid liquid |
| CN103805158A (en) * | 2012-11-09 | 2014-05-21 | 中国石油化工股份有限公司 | Cross-linked acid acidizing fracturing fluid, preparation method and application thereof |
-
2015
- 2015-06-11 CN CN201510320614.2A patent/CN105086990A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5238067A (en) * | 1992-05-18 | 1993-08-24 | Mobil Oil Corporation | Improved means of fracture acidizing carbonate formations |
| CN102277152A (en) * | 2011-05-16 | 2011-12-14 | 陕西科技大学 | Acid-triggered thickening agent and preparation method thereof |
| CN102516976A (en) * | 2011-11-11 | 2012-06-27 | 中国石油天然气集团公司 | Preparation method of multi-component organic cross-linked acid liquid |
| CN103805158A (en) * | 2012-11-09 | 2014-05-21 | 中国石油化工股份有限公司 | Cross-linked acid acidizing fracturing fluid, preparation method and application thereof |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108822827A (en) * | 2018-07-21 | 2018-11-16 | 东营市宝泽能源科技有限公司 | A kind of superhigh temperature cross-linked acid |
| CN108913119A (en) * | 2018-07-21 | 2018-11-30 | 东营市宝泽能源科技有限公司 | A kind of pressure break thickening agent and preparation method thereof |
| CN110156617A (en) * | 2019-06-12 | 2019-08-23 | 中国石油化工股份有限公司 | A kind of preparation method and applications of corrosion inhibiter |
| CN110156617B (en) * | 2019-06-12 | 2022-04-19 | 中国石油化工股份有限公司 | Preparation method and application of corrosion inhibitor |
| CN110628410A (en) * | 2019-10-16 | 2019-12-31 | 北京弘毅恩泽能源技术有限公司 | High-temperature-resistant cross-linked acid system for acid fracturing and preparation method thereof |
| CN111849454A (en) * | 2020-07-14 | 2020-10-30 | 东方宝麟科技发展(北京)有限公司 | Soluble bridge plug dissolution assisting system and shale gas horizontal well soluble bridge plug dissolution assisting card process |
| CN111849454B (en) * | 2020-07-14 | 2022-08-12 | 东方宝麟科技发展(北京)有限公司 | Soluble bridge plug dissolution assisting system and shale gas horizontal well soluble bridge plug dissolution assisting card process |
| CN115488986A (en) * | 2022-09-26 | 2022-12-20 | 徐州安联木业有限公司 | Flame-retardant waterproof type recyclable environment-friendly plate |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105086990A (en) | Composite acid fracturing working fluid and preparation method thereof | |
| US8003577B2 (en) | Method of treating subterranean formation with crosslinked polymer fluid | |
| US7665522B2 (en) | Fiber laden energized fluids and methods of use | |
| US7806182B2 (en) | Stimulation method | |
| US9284482B2 (en) | Acidic internal breaker for viscoelastic surfactant fluids in brine | |
| US7798224B2 (en) | Rheology controlled heterogeneous particle placement in hydraulic fracturing | |
| US7888295B2 (en) | Crosslinked polymer solutions and methods of use | |
| EA015579B1 (en) | Methods of treating subterranean formations with heteropolysaccharides based fluids | |
| US11279866B2 (en) | Boosters for breakers containing iron compounds | |
| US20100184630A1 (en) | Breaking the rheology of a wellbore fluid by creating phase separation | |
| WO2007046072A2 (en) | Methods of fracturing formations using quaternary amine salts as viscosifiers | |
| CA2945479A1 (en) | Treatment fluid | |
| CN110792421B (en) | Fracturing process for development and application of low-permeability heterogeneous sandstone oil-gas layer | |
| Zhang et al. | Development and field pilot test of a novel viscoelastic anionic-surfactant (VAS) fracturing fluid | |
| US10093847B2 (en) | Dual breaker system for reducing formation damage during fracturing | |
| CN106893573A (en) | A kind of biological fracturing fluid system and its preparation and application | |
| EP3362534A1 (en) | Gelling fluids and related methods of use | |
| US20130180713A1 (en) | In-situ crosslinking with aluminum carboxylate for acid stimulation of a carbonate formation | |
| CN103881687A (en) | Instant modified cellulose cross-linked clean fracturing fluid and preparation method thereof | |
| CN109722234A (en) | A kind of acidic fracturing fluid and preparation method thereof | |
| CA2641332C (en) | Stimulation method | |
| CN113583653A (en) | Novel aqueous fracturing fluid composition and fracturing method using the same | |
| CN104073234A (en) | Fracturing fluid based on nonmetallic ion crosslinking agent as well as preparation method and application of fracturing fluid | |
| Yuan et al. | The Development of New Active Gelled Acid and the Practical Application |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151125 |
|
| RJ01 | Rejection of invention patent application after publication |