CN109536156A - Bio-based viscosity reduction/oil displacement fracturing pre-liquid system and preparation method and application thereof - Google Patents
Bio-based viscosity reduction/oil displacement fracturing pre-liquid system and preparation method and application thereof Download PDFInfo
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- 238000006073 displacement reaction Methods 0.000 title abstract description 12
- 230000009467 reduction Effects 0.000 title abstract description 12
- 239000012530 fluid Substances 0.000 claims abstract description 46
- 239000003921 oil Substances 0.000 claims abstract description 40
- 229920002907 Guar gum Polymers 0.000 claims abstract description 26
- 239000000665 guar gum Substances 0.000 claims abstract description 26
- 229960002154 guar gum Drugs 0.000 claims abstract description 26
- 235000010417 guar gum Nutrition 0.000 claims abstract description 26
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 20
- 238000000855 fermentation Methods 0.000 claims abstract description 16
- 230000004151 fermentation Effects 0.000 claims abstract description 16
- 241000193744 Bacillus amyloliquefaciens Species 0.000 claims abstract description 15
- 230000003111 delayed effect Effects 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 5
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- 235000019270 ammonium chloride Nutrition 0.000 claims description 2
- JYIKNQVWKBUSNH-WVDDFWQHSA-N caspofungin Chemical compound C1([C@H](O)[C@@H](O)[C@H]2C(=O)N[C@H](C(=O)N3CC[C@H](O)[C@H]3C(=O)N[C@H](NCCN)[C@H](O)C[C@@H](C(N[C@H](C(=O)N3C[C@H](O)C[C@H]3C(=O)N2)[C@@H](C)O)=O)NC(=O)CCCCCCCC[C@@H](C)C[C@@H](C)CC)[C@H](O)CCN)=CC=C(O)C=C1 JYIKNQVWKBUSNH-WVDDFWQHSA-N 0.000 claims description 2
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- 230000000694 effects Effects 0.000 abstract description 13
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 7
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- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 10
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- CSNNHWWHGAXBCP-UHFFFAOYSA-L magnesium sulphate Substances [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
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- 244000241257 Cucumis melo Species 0.000 description 1
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- XQCFHQBGMWUEMY-ZPUQHVIOSA-N Nitrovin Chemical compound C=1C=C([N+]([O-])=O)OC=1\C=C\C(=NNC(=N)N)\C=C\C1=CC=C([N+]([O-])=O)O1 XQCFHQBGMWUEMY-ZPUQHVIOSA-N 0.000 description 1
- 206010029719 Nonspecific reaction Diseases 0.000 description 1
- 206010030113 Oedema Diseases 0.000 description 1
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- WJEIYVAPNMUNIU-UHFFFAOYSA-N [Na].OC(O)=O Chemical compound [Na].OC(O)=O WJEIYVAPNMUNIU-UHFFFAOYSA-N 0.000 description 1
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- ZPWVASYFFYYZEW-UHFFFAOYSA-L dipotassium hydrogen phosphate Chemical compound [K+].[K+].OP([O-])([O-])=O ZPWVASYFFYYZEW-UHFFFAOYSA-L 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
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- 229930195733 hydrocarbon Natural products 0.000 description 1
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- 239000004615 ingredient Substances 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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- 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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- 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
- C09K8/605—Compositions for stimulating production by acting on the underground formation containing biocides
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- 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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- 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
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- 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
- C09K8/90—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
- C09K8/905—Biopolymers
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
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- Micro-Organisms Or Cultivation Processes Thereof (AREA)
Abstract
The invention discloses a bio-based viscosity-reducing/oil-displacing fracturing pre-liquid system and a preparation method and application thereof. The system comprises a water-based base solution, a gel breaker and a cross-linking agent, wherein the gel breaker is a fermentation broth of Bacillus amyloliquefaciens CB-019, the addition amount of the gel breaker is 0.05-1.5 Wt% of the mass of the base solution, and the viable count of the CB-019 fermentation broth is 1-3 x 109Per mL; the crosslinking agent is SITAR-II type super strong delayed crosslinking agent, and the volume ratio of the base liquid to the crosslinking agent is 100: 0.2 to 0.6. The bacillus amyloliquefaciens CB-019 can specifically break the guar gum and grow by taking the guar gum as a unique carbon source to form a fracturing-viscosity reduction/oil displacement integrated bio-based fracturing fluid prepad liquid system which takes functional microorganisms and the guar gum as centers, is favorable for improving the gel breaking efficiency and reducing the gel breaking residue, and the microorganism acts on crude oil to generate the viscosity reduction oil displacement effect and improve the fracturing operation effect.
Description
Technical field
The invention belongs to hydrocarbon recovery reservoirs renovation technique fields, and in particular to a kind of new bio base viscosity reduction/displacement of reservoir oil pressure
Preposition liquid system is split, the preparation method and application of the pad of frac system is also related to.
Background technique
With deepening continuously for oil field development, exploit object from conventional oil reservoir be increasingly turned to it is low with reservoir permeability,
The nontraditional reservoir for the features such as viscosity of thickened oil is big, therefore, the reservoir reconstructions such as efficient hydraulic fracturing, microbial oil displacement means at
For the key technology of low hole compact oil reservoir, the important measures of heavy crude reservoir increasing yield and injection and economical and effective exploitation.
Microbial oil displacement is by the microbial inoculum of surface separation culture and nutrient solution injection oil reservoir or simple injection
Microorganism in nutrient solution active coating makes its growth and breeding in oil reservoir, generates the metabolite for being conducive to improve recovery ratio,
Or microbial metabolic products are directly injected into, the method to improve oil recovery rate.Microbial oil displacement is effectively improved oil as one kind
The reservoir reconstruction means for hiding property are led to because it is with the advantages such as easy construction, long action time, low in cost, environmental-friendly
Often it is applied to together with other stimulation technologies in the nontraditional reservoir for being difficult to develop.
Conventional hydraulic fracturing liquid system is mainly with guar gum and its derivative for main thickening agent, addition crosslinking agent,
A variety of auxiliary agents such as gel breaker, cleanup additive have at low cost, highly-safe, strong operability, are widely used, good combination property etc.
Advantage is widely applied in oil-gas field development.But there are still many problems for existing pressure break system: when the reaction of gel breaker
Between and its activity to temperature dependency height, break the glue duration it is short, and conventional break agent break glue have randomness, lead to guar gum
Glycosidic bond is not exclusively broken；Broken glue reaction belongs to nonspecific reaction, may with touch oil pipe, bottom matrix, crude oil
Etc. reacting；Residue does not break damage caused by the concentration glue and filter cake of glue greatly.
For the problems of existing fracturing fluid system, uses pressure break gel breaking enzyme as gel breaker, make in specific manner
For guar gum after being crosslinked, hydrolyzing its glycosidic bond makes its broken glue, reacts rapider and thorough.But either conventional fracturing liquid
The problems such as system or gel breaking enzyme fracturing fluid system, there are still broken glue to a certain extent not exclusively, level of residue is big after breaking gel,
Eventually lead to construction after anti-row lead it is not up to standard.Therefore, a kind of new broken glue means are found, so that its broken glue acts on single-minded, broken glue
Level of residue reduction etc. is the research hotspot and improvement direction of current fracturing technique and fracturing fluid property evaluation.
Summary of the invention
The object of the present invention is to provide a kind of biology base pad of frac system and preparation method, which has broken
Glue-viscosity reduction double effects, gel breaker is the microorganism with displacement of reservoir oil function in system, and breaking glue solution surface tension is low, residual after breaking gel
The quantity of slag is small, and microbial metabolic products have viscosity reducing effect to oil reservoir.
The first aspect of the present invention provides a kind of biology base pad of frac system, including aqua type base fluid, gel breaker
And crosslinking agent, wherein
The aqua type base fluid is grouped as by the group of following mass percent: thickener 0.22~0.30%, clay is steady
Determine agent 0.2~1%, cleanup additive 0.1~1%, fungicide 0.01~0.1%, pH adjusting agent 0.01~0.2%, surplus is water,
Wherein the thickener is guar gum original powder, guar gum and/or modifyed guar gum, and the cleanup additive is ZITHE-34 type cleanup additive；
The gel breaker is the zymocyte liquid of bacillus amyloliquefaciens CB-019, and the additional amount of gel breaker is base fluid quality
0.05~1.5%, the viable count of the CB-019 zymocyte liquid is 1~3 × 109A/mL；
The crosslinking agent is the superpower delayed crosslinker of II type of SITAR-, the volume ratio of base fluid and crosslinking agent be 100:0.2~
0.6。
In the above-mentioned technical solutions, the aqua type base fluid is grouped as by the group of following mass percent: thickener
0.22~0.30%, clay stabilizer 0.2~1%, cleanup additive 0.1~1%, fungicide 0.01~0.1%, pH regulator
0.01~0.2%, surplus is water, wherein the thickener is one of guar gum original powder, guar gum or modifyed guar gum or a variety of
Mixture, the cleanup additive be ZITHE-34 type cleanup additive.
In the above-mentioned technical solutions, the modifyed guar gum is hydroxypropyl guar gum, carboxy-methyl hydroxy propyl guar gum.
In the above-mentioned technical solutions, the clay stabilizer is potassium chloride and/or ammonium chloride.
In the above-mentioned technical solutions, the fungicide is one of Caspofungin, iraq subtilis actinomycin A, FHS18 or more
Kind.
In the above-mentioned technical solutions, the pH adjusting agent is in the alkaline matters such as sodium carbonate, sodium bicarbonate, sodium hydroxide
It is one or more.PH adjusting agent is added, the pH value of base fluid is adjusted to 6.7~7.0.
The second aspect of the present invention provides a kind of preparation method of above-mentioned biology base pad of frac system frozen glue, including
The step of crosslinking agent and gel breaker are added in aqua type base fluid, mixes, forms frozen glue.
Preferably, the aqua type base fluid is prepared as follows to obtain: (mass percent) accurately takes according to the proportion
Thickener, clay stabilizer, fungicide are added in water, cleanup additive, pH adjusting agent are added after mixing, after mixing for each component
Stand swelling；Wherein, standing swelling time is 0.5~4h, and preferably 4h, temperature is room temperature；Stirring side can be used in mixing method
Formula stirs 5~20min, such as at 150~300r/min of revolving speed to obtain homogeneous solution.
The third aspect of the present invention provides above-mentioned biology base pad of frac system in conventional oil reservoir, ligh-oil reservoir, thick
Application in oil reservoir, the transformation of super-heavy oil deposit block reservoir in routine and volume fracturing.In use, frozen glue will be prepared into
Biology base pad of frac system is injected into the oil-well strata for needing to carry out fracturing work, generates fracturing effect simultaneously to reach
Reduce the purpose of payzone viscosity of crude.The super-viscous oil refers to viscosity in the crude oil of 50000mPas or more.
In the present invention, the gel breaker is the zymocyte liquid of bacillus amyloliquefaciens CB-019, the hair of the CB-019
Yeast-like fungi liquid is mixed according to a certain percentage by the bacterium solution and fermentation medium that obtain the fermentation of bacillus amyloliquefaciens CB-019
It closes and obtains, it is preferable that according to volume ratio 1:2~4, more preferable 1:3.In zymocyte liquid guarantee viable count concentration 1~3 ×
109/ mL guarantees its broken glue effect.The bacillus amyloliquefaciens CB-019 bacterial strain is in Chinese microorganism strain preservation management
Committee's common micro-organisms center preservation, deposit number are CGMCC No.11950, and the deposit date is on January 4th, 2016.Xie Dian
Afnyloliquefaciens CB-019 high temperature resistant, at 50 DEG C or more also can normal growth, its broken glue function can be played.On the other hand,
Bacillus amyloliquefaciens CB-019 can be grown by sole carbon source of guar gum, and such biology base pad of frac system is prepared into
After frozen glue, the colloid (guar gum) after which can be crosslinked is carbon source for growth, plays the role of breaking glue well.Adjust gel breaker
Additional amount can meet requirement of the different temperatures reservoir to gel breaking time and broken glue level of residue, and 1~7h of gel breaking time is controllable, break glue
Level of residue is down to 180mg/L or less in liquid.
Specifically, the zymocyte liquid of above-mentioned bacillus amyloliquefaciens CB-019, is prepared as follows to obtain:
(1) bacillus amyloliquefaciens CB-019 strain is inoculated on LB solid medium, 30~37 DEG C of cultures 0.5~
2d, the LB solid medium be 18~20g/L of agar powder, 8~10g/L of peptone, yeast powder 3~5g/L, NaCl 8~
10g/L, moisturizing to 1L, pH7.0~8.0；
(2) LB solid medium single colonie is inoculated in seed culture medium, is shaken under 30~37 DEG C, 100~300rpm
1~4d of culture is swung, seed liquor, the seed culture medium are obtained are as follows: 8~10g/L of peptone, yeast powder 3~5g/L, NaCl 8~
10g/L, moisturizing to 1L, pH 7.0~8.0；
(3) seed liquor accesses in fermentation medium according to volume ratio 1:20~50, under 30-37 DEG C, 100~300rpm
2~5d of shaken cultivation, centrifugation, must solve starch bud pole bacterium CB-019 fermentation liquid, the fermentation medium are as follows: and glucose 10~
12g/L, 2~3g/L of L-sodium, yeast powder 0.5~1g/L, K2HPO43~4g/L, KH2PO41.5~2g/L, FeSO4
0.005~0.01g/L, MnSO40.005~0.01g/L, MgSO40.01~0.02g/L, CaCl20.01~0.02g/L is mended
Water is to 1L, pH7.0~8.0.
(4) at 25~50 DEG C, starch bud pole bacterium CB-019 fermentation liquid and fermentation will be solved according to volume ratio 1:2~4
Culture medium is stirred, and obtains CB-019 function bacterium solution, and the viable bacteria Particle density of bacterial strain CB-019 is 1~3 × 10 in bacterium solution9mL。
The present invention obtains having delay cross-linking effect, gel breaking time can by optimizing to fracturing fluid prepad fluid ingredient
Control and thoroughly green, environmentally friendly, the efficient Low Damage of broken glue, the biology base pad of frac system with reducing thick oil viscosity effect,
The fracturing fluid gel that the system is prepared is at 90 DEG C, 170s-1Continuous shear stress 120min frozen glue viscosity >=140mPas under rate,
The function as fracturing fluid can be played well.Specifically, using bacillus amyloliquefaciens CB-019 function bacterium solution as broken glue
Agent assigns its stronger controllable rubber breaking energy while heatproof, anti-shear ability and the prop-carrying capacity for guaranteeing formed frozen glue
Power, and system is made to have the effect of increasing economic efficiency to heavy oil tested layer viscosity reduction.On the other hand, function strain is with the glue after being crosslinked
Body is that carbon source plays the role of brokenly glue, and level of residue is correspondingly reduced after breaking gel.
Biology base pad of frac system is big to level of residue present in super-heavy oil deposit block reservoir in the present invention, returns
Row leads low, conventional displacement of reservoir oil means and is difficult to the problems such as coming into force with significant improvement.It can guarantee the resistance to of system when pressing crack construction
Warm resistant to shearing ability, prop-carrying capacity, gel breaking time, level of residue and breaking glue solution surface and interface tension are all satisfied or better than country and rows
The requirement of industry standard can be widely applied to the reservoir reconstruction operation of conventional oil gas reservoir, viscous crude super-viscous oil block oil reservoir, can be effective
Cost is reduced, recovery ratio is promoted.
Use functional microorganism bacterium solution as gel breaker in biology base pad of frac system in the present invention, it not only can be with
Single-minded broken glue is carried out for the thickener guar gum in guar gum pressure break system, and can be grown by sole carbon source of guar gum, metabolism
Bio-surface active substance is generated, while generating broken glue function, the displacement of reservoir oil/viscosity reduction function is had both, with functional microorganism, melon
Centered on glue, the inside circulating system an of green high-efficient is formed, the reservoir reconstruction scheme suitable for a variety of oil-gas reservoirs.
In the present invention biology base pad of frac system have the characteristics that low cost, high-efficiency environment friendly, be by fracturing technology with
Microbial oil displacement technique in conjunction with and formed nested technique.To the exploitation of the economical and effective of viscous crude, super-viscous oil block oil reservoir and not
The transformation for carrying out the type oil reservoir provides new method and approach, has directive significance.
It is preferred that the low breaking glue solution surface and interface tension gone out, low broken glue level of residue, the biology base pressure break with reducing thick oil viscosity effect
Preposition liquid system, for determining that the reservoir with economic feasibility and technical feasibility for being suitble to a variety of different blocks oil reservoirs changes
Arrangement and method for construction is made, is had broad application prospects.Pursuing always in current oil field at home field reduces residue, efficient Low Damage
Exploitation overall background under, have great importance.
Detailed description of the invention
Fig. 1 shows frozen glue prepared by the present invention and that takes sand frozen glue hang state photo.
Fig. 2 indicates the shear rheology curve for frozen glue prepared by the present invention.
Specific embodiment
Subordinate's non-limiting embodiment can be with a person of ordinary skill in the art will more fully understand the present invention, but not
It limit the invention in any way.In addition, unless otherwise specified, used experimental method is routine in following embodiments
Method, material therefor, reagent etc. can be bought from biological or chemical Reagent Company.
Material used in following embodiments:
CB-019 function bacterium solution: it (is protected by bacillus amyloliquefaciens (Bacillus amyloliquefaciens) CB-019
Hiding number is CGMCC No.11950) fermentation is prepared, it is specific the preparation method is as follows:
(1) bacillus amyloliquefaciens CB-019 strain is inoculated on LB solid medium, 37 DEG C of cultures 1d, the LB
Solid medium be agar powder 18g/L, peptone 8g/L, yeast powder 3g/L, NaCl 10g/L, moisturizing to 1L, pH7.0~
8.0；
(2) LB solid medium single colonie is inoculated in seed culture medium, at 37 DEG C, shaken cultivation 1d under 180rpm,
Obtain seed liquor, the seed culture medium are as follows: peptone 9g/L, yeast powder 3g/L, NaCl 9g/L, moisturizing to 1L, pH 7.0-
8.0；
(3) seed liquor accesses in fermentation medium according to volume ratio 1:20, at 37 DEG C, shaken cultivation 2d under 180rpm, from
The heart must solve starch bud pole bacterium CB-019 fermentation liquid, the fermentation medium are as follows: glucose 12g/L, L-sodium 2g/L,
Yeast powder 1g/L, K2HPO43g/L, KH2PO41.5g/L, FeSO40.01g/L, MnSO40.01g/L, MgSO40.01g/L,
CaCl20.01g/L, moisturizing to 1L, pH7.0~8.0.
(4) at 25~50 DEG C, starch bud pole bacterium CB-019 zymocyte liquid and fermentation will be solved according to volume ratio 1:3
Culture medium is stirred, and obtains CB-019 function bacterium solution, and the viable count of bacterial strain CB-019 is 1 × 10 in bacterium solution9/mL。
The efficient cleanup additive of ZITHE-34 type: microorganism Science and Technology Ltd. is known purchased from Dalian；
FHS18: it is purchased from Shandong region Shi Purui company；
FANTA-06 high temperature type pressure break gel breaking enzyme: microorganism Science and Technology Ltd. is known purchased from Dalian；
The superpower delayed crosslinker of II type of SITAR-: microorganism Science and Technology Ltd. is known purchased from Dalian.
Embodiment 1
Biology base pad of frac system is by aqua type base fluid (being known as base fluid in following explanation), gel breaker and crosslinking agent
Composition, base fluid are grouped as by the group of following mass percent: thickener (hydroxypropyl guar gum) 0.22%, clay stabilizer (chlorination
Potassium) 1%, cleanup additive (the efficient cleanup additive of ZITHE-34 type) 0.1%, fungicide (FHS18) 0.05%, pH adjusting agent (carbonic acid
Sodium) 0.2%, surplus is water；Crosslinking agent is the superpower delayed crosslinker of II type of SITAR-, and the volume ratio of base fluid and crosslinking agent is
100:0.2；Gel breaker is CB-019 function bacterium solution, and bacterium solution additional amount accounts for the 0.15% of base fluid quality.
Each component is accurately taken according to the mass percent of the above-mentioned each component provided, is prepared as follows and is given birth to
The frozen glue of object base pad of frac system: at revolving speed 300r/min, Xiang Shuizhong proportionally sequentially adds thickening while stirring
Agent, clay stabilizer and fungicide sequentially add cleanup additive, pH regulator after stirring l0min, continue to stir 5min, mix
Swelling 4h is stood afterwards, obtains base fluid；Above-mentioned base fluid 400mL is taken, at revolving speed 300r/min, SITAR- II is added while stirring
The superpower delayed crosslinker of type and gel breaker continue to stir lmin, form frozen glue.
Embodiment 2
Biology base pad of frac system is made of base fluid, gel breaker and crosslinking agent, and base fluid is by following mass percent
Group is grouped as: thickener (hydroxypropyl guar gum) 0.30%, clay stabilizer (potassium chloride) 1%, and (ZITHE-34 type is high for cleanup additive
Imitate cleanup additive) 0.1%, fungicide (FHS18) 0.05%, pH adjusting agent (sodium carbonate) 0.2%, surplus is water；Crosslinking agent is
The volume ratio of the superpower delayed crosslinker of II type of SITAR-, base fluid and crosslinking agent is 100:0.2；Gel breaker is CB-019 function bacterium
Liquid, bacterium solution additional amount account for the 0.15% of base fluid quality.
Each component is accurately taken according to the mass percent of the above-mentioned each component provided, is prepared as follows and is given birth to
The frozen glue of object base pad of frac system: at room temperature, revolving speed 300r/min, while stirring Xiang Shuizhong sequentially add thickener,
Clay stabilizer and fungicide sequentially add cleanup additive, pH regulator after stirring l0min, continue to stir 5min, after mixing
Swelling 4h is stood, base fluid is obtained；Above-mentioned base fluid 400mL is taken, at room temperature, revolving speed 300r/min, SITAR- is added while stirring
The superpower delayed crosslinker of II type and gel breaker continue to stir lmin, form frozen glue.
Embodiment 3
According to regulation in SY/T5107-2005 " aqueous fracturing fluid method of evaluating performance ", measurement delay crosslinking time freezes
Glue intensity and prop-carrying capacity, as shown in Figure 1, Figure 1A is frozen glue prepared by embodiment 1, Figure 1B is in frozen glue prepared by embodiment 1
Sand frozen glue is taken after 30% ceramsite propping agent (20/40 mesh) is added.Measurement result shows the delay crosslinking time of above-mentioned frozen glue
It can be hung, good toughness for 87s, frozen glue viscosity 106mPas, surface is smooth.After 30% ceramsite propping agent (20/40 mesh) is added
The sand frozen glue resistance to ability of hanging still with super strength is taken, shows that the outstanding sand effect of the jelly system is good, filed application can be met and wanted
It asks.
1) shearing rheological property of biology base pad of frac system
Test method: base fluid 200mL obtained in Example 1, at room temperature, revolving speed 300r/min, while stirring plus
Enter the superpower delayed crosslinker 1mL of II type of SITAR-, continues to stir l min, form the frozen glue that can be hung；It is flowed using III-J of MARS
Become instrument, at 90 DEG C of temperature, shear rate 170s-1Lower continuous shear stress frozen glue 120min tests the shear rheology curve of frozen glue, knot
Fruit such as Fig. 2.
The result shows that above-mentioned frozen glue is in 90 DEG C of temperature, shear rate 170s-1Lower continuous shear stress 120min, viscosity >=
140mPas, heatproof, resistant to shearing ability are strong, can satisfy pressing crack construction needs.
2) the broken colloidality energy of biology base pad of frac system under cryogenic
Test method: base fluid 200mL obtained in Example 1, at 40 DEG C, revolving speed 300r/min, while stirring plus
Enter the superpower delayed crosslinker 0.5mL of II type of SITAR- and CB-019 function bacterium solution or FANTA-05 low form pressure break gel breaking enzyme or
APS (ammonium persulfate) (additive amount such as table 1) continues to stir l min, forms the frozen glue that can be hung；According to SY/T 5107-2005
Regulation in " aqueous fracturing fluid method of evaluating performance ", measures gel breaking time and breaking glue solution level of residue, as a result such as table 1.
Broken colloidality energy of the 1 biology base pad of frac system of table at 40 DEG C
The result shows that biology base pad of frac system utilizes adjustment CB-019 function bacterium solution under cryogenic conditions (40 DEG C)
Content (0.15~0.5Wt%) controllable rubber breaking of 1~4h may be implemented in 40 DEG C of broken glue, breaking glue solution viscosity is small after breaking gel
In 2.23mPas, 150~160mg/L of level of residue.The simple broken glue that cannot achieve system using APS.Illustrate CB-019
The good gel breaking capacity of function bacteria liquid has, may be implemented the controllable rubber breaking under low temperature, while level of residue is low, can mitigate pair
The injury of reservoir.
3) the broken colloidality energy of biology base pad of frac system under the high temperature conditions
Test method: base fluid 200mL obtained in Example 1, at 70 DEG C, revolving speed 300r/min, while stirring plus
Enter the superpower delayed crosslinker 0.5mL of II type of SITAR- and CB-019 function bacterium solution or FANTA-06 high temperature type pressure break gel breaking enzyme
Or APS (ammonium persulfate) (additive amount such as table 2), continue to stir l min, forms the frozen glue that can be hung；According to SY/T 5107-
Regulation in 2005 " aqueous fracturing fluid method of evaluating performance ", measures gel breaking time and breaking glue solution level of residue, as a result such as table 2.
Broken colloidality energy of the 2 biology base pad of frac system of table at 70 DEG C
The result shows that biology base pad of frac system utilizes adjustment CB-019 function bacterium solution under hot conditions (70 DEG C)
Content (0.15~0.5Wt%) controllable rubber breaking of 1~4h may be implemented in 70 DEG C of broken glue, breaking glue solution viscosity is small after breaking gel
In 2.13mPas, 130~150mg/L of level of residue.The good gel breaking capacity of CB-019 function bacteria liquid has, may be implemented height
Controllable rubber breaking under temperature, while level of residue is low.Illustrate that biology base pad of frac system can be before the deadline in the present invention
Thoroughly liquefaction, breaking glue solution level of residue is lower, can effectively reduce the injury to stratum.
4) the surface and interface performance of biology base pad of frac system breaking glue solution after breaking gel
Test method: taking base fluid 100mL respectively, and at 37 DEG C, revolving speed 300r/min, SITAR- II is added while stirring
The superpower delayed crosslinker 0.5mL of type and gel breaker (CB-019 function bacterium solution) 0.15mL continues to stir lmin, and formation can be hung
Frozen glue；According to regulation in SY/T5107-2005 " aqueous fracturing fluid method of evaluating performance ", measurement breaking glue solution after breaking gel completely
Surface and interface tension.
The result shows that the surface tension of the preposition system of biology base pressure break breaking glue solution after breaking gel is reduced to 22.30 mN/m, boundary
Face tension is reduced to 0.90mN/m, illustrates that the efficient cleanup additive of ZITHE-34 type has ultralow surface and interface performance, can make breaking glue solution
Stratum is smoothly discharged, removes shaft bottom hydrops, to reduce the water-blocking effect in shaft bottom, while the degradable most of hydroxypropyl of gel breaker
Base guar gum residue fragment reduces injury, improves construction effect.
5) viscosity-reducing performance of the biology base pad of frac system to viscous crude
Dewatered oil 70.0g is weighed in triangular flask, the 4 of 30ml CB-019 function bacterium solution or Application Example 3 are added)
The middle breaking glue solution using biology base pad of frac system after breaking gel, 37 DEG C of shaken cultivations 7d, 50 DEG C of constant temperature 1h, in constant temperature
Under the conditions of stir 2min, revolving speed 250r/min.It calculates culture front and back viscosity of crude and changes ratio, such as table 3.
3 biology base pad of frac system reducing thick oil viscosity performance of table
The result of table 3, which can be seen that, uses the breaking glue solution of biology base pad of frac system of the present invention after breaking gel to crude oil
Good viscosity reduction ability, viscosity, close to the processing of CB-019 function bacterium solution, illustrate this hair than reducing 97.35% before processing
Bright biology base pad of frac system has the function of good reduction viscosity of crude, while the function bacterium CB-019 in system
Also there is good survival rate in breaking glue solution after breaking gel, so that the preposition system of pressure break can be realized lasting broken glue and to original
The viscosity reduction ability of oil.
Embodiment 4
CB-019 function bacterium is using guar gum as the detection of carbon source for growth performance.
Test method: configuration guar gum culture medium (g/L): guar gum 4.5, NH4Cl 6, yeast powder 1, NaCl 5, KH2PO43,
K2HPO4, MgSO4·7H2O 0.1, CaCl20.02, moisturizing to 1L, pH7.0~8.0.115 DEG C, sterilize 30min.It is connect by 5%
Kind amount inoculation CB-019 bacterial strain (that is, bacillus amyloliquefaciens CB-019), 37 DEG C, 180rpm cultivates 72d, and front and back is cultivated in measurement
The OD value of culture medium.
Growing state of the 4 CB-019 bacterial strain of table in guar gum culture medium
The result shows that CB-019 bacterial strain can be grown by sole carbon source of guar gum.
Claims (7)
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| CN113685163A (en) * | 2021-08-26 | 2021-11-23 | 杜海峰 | Novel process for microbial agent oil well fracturing prepad fluid |
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Application publication date: 20190329 |