CN107286922A - A kind of oil-gas field fracturing liquid containing PVA fibers, oil gas field well cementation agent and oil-gas field fracturing diverting agent - Google Patents
A kind of oil-gas field fracturing liquid containing PVA fibers, oil gas field well cementation agent and oil-gas field fracturing diverting agent Download PDFInfo
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- CN107286922A CN107286922A CN201610225000.0A CN201610225000A CN107286922A CN 107286922 A CN107286922 A CN 107286922A CN 201610225000 A CN201610225000 A CN 201610225000A CN 107286922 A CN107286922 A CN 107286922A
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- 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
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/44—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing organic binders only
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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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
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Abstract
Oil-gas field fracturing liquid, diverting agent, well cementation agent, containing PVA fibers, the PVA fibers are prepared from by the degree of polymerization 1000~3500,80~99.9mol% of alcoholysis degree PVA through spinning.Oil-gas field fracturing liquid has preferable heatproof anti-shear performance, small to environmental injury, and cost is low and environmental protection, has and takes sand function well, beneficial to fracturing fluid recovery (backflow)；Oil gas field well cementation agent can strengthen the intensity and toughness of well cementing material, can also play a part of leakproof, and degradable, small to environmental disruption；There is oil-gas field fracturing diverting agent good drop to consider mistake effect, forms one layer of shielding layer at the position for being intended to temporarily block up, fracturing fluid is smoothly turned to, product is degradable, remaining in the composition of ground end will not pollute to environment.
Description
Technical field
Contain PVA the present invention relates to a kind of oil-gas field fracturing liquid, oil gas field well cementation agent and oil-gas field fracturing diverting agent, more particularly to one kind（Polyvinyl alcohol）Oil-gas field fracturing liquid, oil gas field well cementation agent and the oil-gas field fracturing diverting agent of fiber.
Background technology
China's Low Permeability Oil/gas stock number is huge, accounts for and has verified more than the 70% of gross reserves, is the main potential work area produced in the following increasing the storage of China.This kind of petroleum resources have three it is low the characteristics of, that is, verify that rate is low, natural production rate is low, and recovery ratio is low.Practical application shows, in this kind of exploitation of oil-gas field, it is badly in need of the good well cementation agent of function, pressure break diverting agent, and the oil gas field working solutions such as the oil-gas field fracturing liquid for preferably taking sand effect can be played, meanwhile, also require that these oil gas field working solutions are tried not to environmental pollution.
In recent years, domestic and international researcher has carried out numerous studies around oil gas field field pressure break, well cementation, temporary plugging technique.CN200610063700.0, a kind of composite fracturing fluid, it compounds the 0.4-1.0wt% that gelatinizing agent is fracturing fluid quality, and metal crosslinking agent is the 0.05-0.7wt% of fracturing fluid quality, and oxidation gel breaker is the 0.05-0.5wt% of fracturing fluid quality, and remaining is water.CN201410088243.5, a kind of instant modified cellulose crosslinking clean fracturing fluid and preparation method thereof, use component for：Two parts, DL-16 type cleanup additive 0.3-0.7 parts by weight in FAG-500 type modified cellulose 0.2-0.6 parts by weight, FAZ-1 types thickening initiator 0.1-0.5, FAJ-305 type cross-linking regulator 0.5-1.2 parts by weight, 0.2-0.7 parts of organic zirconium crosslinker of FAC-201 types polarity chelating, 0.002-0.07 parts of NBA-102 type capsule breakers, the parts by weight of water 100.CN201510406552.7, a kind of cellulose blending modified polyvinylalcohol fracturing fluid and preparation method thereof, a kind of cellulose blending modified polyvinylalcohol fracturing fluid is disclosed, by 1-15 parts of polyvinyl alcohol, 1-15 parts of cellulose, the problem of 1-10 parts of organic titanium cross-linking agent, 200-300 parts of water is constituted, but the invention can not solve the thickening property of conventional polyvinyl alcohol, heatproof anti-shear performance is poor.
In order to meet the requirements at the higher level of oil gas field construction, it is necessary to which developing a kind of can both realize small to environmental injury and excellent combination property oil gas field working solution technology.
The content of the invention
An object of the present invention is to provide a kind of oil-gas field fracturing liquid containing PVA fibers.
The second object of the present invention is to provide a kind of oil gas field well cementation agent containing PVA fibers.
The third object of the present invention is to provide a kind of oil-gas field fracturing diverting agent containing PVA fibers.
The object of the invention is realized by following technical scheme：
A kind of oil-gas field fracturing liquid, it is characterised in that：Contain PVA fibers in the oil-gas field fracturing liquid, the PVA fibers are prepared from by the degree of polymerization 1000~3500,80~99.9mol% of alcoholysis degree PVA through spinning.
The molten journey of PVA fibers is 1~50 DEG C in oil-gas field fracturing liquid of the present invention.The molten journey test of PVA fibers：The PVA fibers of certain mass are put into water, water temperature 5 DEG C of heating per minute, temperature during fiber quality loss 10% is starts solution temperature, and temperature difference when it is with being completely dissolved is its molten journey.
The water solution temperature of PVA fibers is 20~150 DEG C in oil-gas field fracturing liquid of the present invention.
Above-mentioned oil-gas field fracturing liquid can be any conventional fracturing fluid, can be aqua type oil-gas field fracturing liquid, oil type oil-gas field fracturing liquid, alcohol fundamental mode oil-gas field fracturing liquid and foam type oil-gas field fracturing liquid.
0.1~1000dtex of line density of PVA fibers in oil-gas field fracturing liquid of the present invention, it is 1~10 cN/dtex to do fracture strength, and mass concentration of length 2~200mm, the PVA fiber in oil-gas field fracturing liquid is 0.1~5.0%.
Specifically, the molten journey of above-mentioned PVA fibers be 40~50 DEG C, water solution temperature be 120~150 DEG C, the mass concentration in oil-gas field fracturing liquid is 0.5~2.5%.
It is further preferred that the oil-gas field fracturing liquid is aqua type fracturing fluid.
Further, aqua type oil field fracturing fluid of the present invention includes thickening agent, crosslinking agent, gel breaker and PVA fibers, mass concentration of the PVA fibers in oil-gas field fracturing liquid is 3.5~5.0%, and thickening agent uses acrylamide and guanidine glue, mass concentration of the thickening agent in oil-gas field fracturing liquid to be 1~1.5 for the mass ratio of 0.1~0.8%, acrylamide and guanidine glue：2~4.
Above-mentioned crosslinking agent is the one or more combination in boric acid, borax, organic boron, organic zirconium, aluminum sulfate, aluminum nitrate, titanium tetrachloride, titanium sulfate, zinc sulfate, organic titanium；It is preferred to use mass ratio 1~2：0.2~0.5 borax and zinc sulfate.
Above-mentioned gel breaker is the one or more combination in capsule, biology enzyme or the organic acid of potassium peroxydisulfate, ammonium persulfate, potassium bichromate, potassium permanganate, enzyme or acid；It is preferred to use mass ratio 1：2~3 ammonium persulfate and potassium permanganate.
According to one embodiment of the invention, the auxiliary agents such as clay stabilizer, cleanup additive, bactericide, foaming agent, defoamer, demulsifier can also be added in above-mentioned aqua type oil-gas field fracturing liquid.Clay stabilizer can prevent oil-gas Layer CLAY MINERALS AND THEIR SIGNIFICANCE hydration swelling and scattered migration, can be potassium chloride, anion surfactant.The addition of bactericide can not only keep the stability on glue surface but also can prevent the growth of bacterium in stratum, such as chlorine, quaternary ammonium salt.Cleanup additive is increase and the contact angle of rock in order to reduce the surface tension or oil water interfacial tension of fracturing fluid, the hollow billet resistance run into during reduction fracturing fluid recovery (backflow), such as lauryl sodium sulfate.The effect of foaming agent is that certain power is provided to stratum, discharging liquid will be helped to be returned from stratum and ejected, such as cationic surfactant.
According to one embodiment of the invention, above-mentioned PVA fibers are added to the mode in oil-gas field fracturing liquid, can only be added in the pressure break preparatory stage, can also be added to simultaneously in pressure break early stage, pressure break mid-term and pressure break tail phase substep in fracturing fluid.
Inventor has found that the vinal of above feature is added in oil-gas field fracturing liquid, significantly improves the prop-carrying capacity of oil-gas field fracturing liquid in R＆D process；The viscosity of oil-gas field fracturing liquid is significantly improved simultaneously, and above-mentioned oil-gas field fracturing liquid is in no addition cleanup additive and gel breaker, and the viscosity at 25 DEG C is 50~350mPas.
A kind of oil-gas field fracturing temporarily blocks up liquid, it is characterised in that：The oil-gas field fracturing temporarily blocks up fiber containing PVA in liquid, and the PVA fibers are prepared from by the degree of polymerization 1000~3500,80~99.9mol% of alcoholysis degree PVA through spinning.
Oil-gas field fracturing of the present invention, which temporarily blocks up PVA fibers in liquid, to be dissolved in 20~150 DEG C of water.
The molten journey that oil-gas field fracturing of the present invention temporarily blocks up PVA fibers in liquid is 1~50 DEG C.
Oil-gas field fracturing of the present invention temporarily blocks up 0.1~1000dtex of line density of PVA fibers in liquid, and it is 1~10 cN/dtex to do fracture strength, and length 2~200mm, PVA fiber is 0.1~5.0% in the mass concentration that oil-gas field fracturing is temporarily blocked up in liquid.
Specifically, the molten journey of above-mentioned PVA fibers be 30~40 DEG C, water solution temperature be 80~90 DEG C, the mass concentration temporarily blocked up in oil gas field in liquid is 0.5~2.5%.
Further, diverting agent of the present invention includes thickening agent, crosslinking agent, acid and PVA fibers；The PVA fibers are 2.0~3.0% in the mass concentration that oil gas field is temporarily blocked up in liquid, and thickening agent uses the mass concentration of guanidine glue, the thickening agent guanidine glue in oil gas field temporarily stifled liquid for 0.5~1.0%.
Above-mentioned crosslinking agent is the one or more combination in boric acid, borax, organic boron, organic zirconium, aluminum sulfate, aluminum nitrate, titanium tetrachloride, titanium sulfate, zinc sulfate, organic titanium；It is preferred to use mass ratio 2~3：0.5~1 boric acid and aluminum nitrate.
Acid is the one or more combination in citric acid, sulfuric acid, hydrochloric acid, acetic acid；Optimization citric acid.
Other auxiliary agents such as pH adjusting agent can also be added in diverting agent of the present invention.
Oil gas field diverting agent of the present invention, preferably blocks old crack, new crack of splitting, significantly improves strata pressure on the basis of original diverting agent（Typically at least improve 6MPa）, make well production increment more than 2 times.
A kind of oil gas field well cementation agent, it is characterised in that：Contain PVA fibers in the oil gas field well cementation agent, the PVA fibers are prepared from by the degree of polymerization 1000~3500,80~99.9mol% of alcoholysis degree PVA through spinning.
PVA fibers can dissolve in 20~150 DEG C of water in oil gas field well cementation agent of the present invention.
The molten journey of PVA fibers is 1~50 DEG C in oil gas field well cementation agent of the present invention.
0.1~1000dtex of line density of PVA fibers in oil gas field well cementation agent of the present invention, it is 1~10 cN/dtex to do fracture strength, and mass concentration of length 2~200mm, the PVA fiber in oil gas field cements the well agent is 0.1~5.0%.
Specifically, the molten journey of above-mentioned PVA fibers be 1~15 DEG C, water solution temperature be 40~60 DEG C, the mass concentration in oil gas field cements the well agent is 1.5~2.5%.
Preferably say, above-mentioned oil gas field well cementation agent includes thickening agent and PVA fibers；Mass concentration of the PVA fibers in oil gas field cements the well agent is 0.5~1.5%, and thickening agent uses the mass concentration of guanidine glue, the thickening agent guanidine glue in oil gas field cements the well agent for 0.5~1.0%.
The present invention has the advantages that：
1st, oil-gas field fracturing liquid prepared by the present invention has advantages below：With preferable heatproof anti-shear performance；Water insoluble matter content is low, and the PVA fibers used inherently degradable non-poisonous environment-friendly materials, small to environmental injury, and cost is low and environmental protection；Have and take sand function well, beneficial to fracturing fluid recovery (backflow), concrete principle is：By PVA fibers as load fluid injects together, plyability proppant is formed in the crack of near wellbore, proppant is matrix, and fiber is enhancing phase.At the end of pressing crack construction, the proppant in crack reaches mechanical balance because bearing to interact in the form of contact between lateral pressure, particle.Fracturing fluid starts after the row of returning, due to washing away for flow of fluid, and this balance is destroyed, plasticity shearing deformation just occurs for proppant particles, forms a series of domes, and then improve the stability of husky arch, fracturing fluid recovery (backflow) speed is improved, and proppant can be controlled to return row well.
2nd, the oil gas field well cementation agent that prepared by the present invention can strengthen the intensity and toughness of well cementing material, can also play a part of leakproof, and degradable, small to environmental disruption.
3rd, there is oil-gas field fracturing diverting agent prepared by the present invention good drop to consider mistake effect, forms one layer of shielding layer at the position for being intended to temporarily block up, fracturing fluid is smoothly turned to, product is degradable, remaining in the composition of ground end will not pollute to environment.
Embodiment
The present invention is specifically described below by embodiment; it is necessarily pointed out that the present embodiment is served only for that the present invention is further described; it is not intended that limiting the scope of the invention, the person skilled in the art in the field can make some nonessential modifications and adaptations to the present invention according to the content of the invention described above.
PVA fibers water solution temperature is tested：The PVA fibers of certain mass are put into water（The mass ratio of PVA fibers and water is 1：100）, water temperature is per minute to heat up 1 DEG C, is stirred in heating, and temperature when solution is transparent is the water solution temperature of PVA fibers.
The molten journey test of PVA fibers：The PVA fibers of certain mass are put into water, water temperature 5 DEG C of heating per minute, temperature during fiber quality loss 10% is starts solution temperature, and temperature difference when it is with being completely dissolved is its molten journey.
PVA fibers are done fracture strength, line density and performed with reference to GB/T14462-1993.
Embodiment 1：A kind of oil-gas field fracturing liquid, by PVA fibers, guanidine glue, water and other material compositions, wherein PVA fibers are by the degree of polymerization 1800, and alcoholysis degree 88.5mol% PVA is prepared from through spinning, and the water solution temperature of PVA fibers is 20 DEG C, molten journey is 3 DEG C, line density 3.5dtex, it is 2.5 cN/dtex, length 12mm to do fracture strength, mass concentration of the PVA fibers in oil-gas field fracturing liquid is 0.8%, and viscosity of the oil-gas field fracturing liquid at 25 DEG C is 60mPas.
Embodiment 2：A kind of oil-gas field fracturing liquid, by PVA fibers, water and other material compositions, wherein PVA fibers are by the degree of polymerization 1500, and alcoholysis degree 85.5mol% PVA is prepared from through spinning, and the water solution temperature of PVA fibers is 30 DEG C, molten journey is 8 DEG C, line density 20dtex, it is 5.5 cN/dtex, length 8mm to do fracture strength, mass concentration of the PVA fibers in oil-gas field fracturing liquid is 1.5%, and viscosity of the oil-gas field fracturing liquid at 25 DEG C is 90mPas.
Embodiment 3：A kind of oil-gas field fracturing liquid, by PVA fibers, guanidine glue, water and other material compositions, wherein PVA fibers are by the degree of polymerization 2400, and alcoholysis degree 92.0mol% PVA is prepared from through spinning, and the water solution temperature of PVA fibers is 50 DEG C, molten journey is 10 DEG C, line density 8.5dtex, it is 6.8cN/dtex, length 20mm to do fracture strength, mass concentration of the PVA fibers in oil-gas field fracturing liquid is 3.0%, and viscosity of the oil-gas field fracturing liquid at 25 DEG C is 120mPas.
Embodiment 4：A kind of oil-gas field fracturing liquid, by PVA fibers, water and other material compositions, wherein PVA fibers are by the degree of polymerization 1300, and alcoholysis degree 93.5mol% PVA is prepared from through spinning, and the water solution temperature of PVA fibers is 90 DEG C, molten journey is 25 DEG C, line density 4.5dtex, it is 9.5 cN/dtex, length 35mm to do fracture strength, mass concentration of the PVA fibers in oil-gas field fracturing liquid is 1.2%, and viscosity of the oil-gas field fracturing liquid at 25 DEG C is 130mPas.
Embodiment 5：A kind of oil-gas field fracturing liquid, including PVA fibers, water, thickening agent, crosslinking agent and gel breaker composition, PVA fibers are by the degree of polymerization 1500~2500, 85~95mol% of alcoholysis degree PVA is prepared from through spinning, the molten journey of PVA fibers is 40~50 DEG C, water solution temperature is 120~150 DEG C, 1~100dtex of line density of PVA fibers, dry fracture strength is 1~10 cN/dtex, 2~50mm of length, mass concentration of the PVA fibers in oil-gas field fracturing liquid is 0.2~2.5%, thickening agent is acrylamide and guanidine glue, mass concentration of the thickening agent in oil-gas field fracturing liquid is 0.1~0.8%, the mass ratio of acrylamide and guanidine glue is 1~1.5：2~4, crosslinking agent uses mass ratio 1~2：0.2~0.5 borax and zinc sulfate；Gel breaker uses mass ratio 1：2~3 ammonium persulfate and potassium permanganate.
Embodiment 6：A kind of oil-gas field fracturing temporarily blocks up liquid, it is made up of PVA fibers, water and other components, PVA fibers are by the degree of polymerization 3000, alcoholysis degree 95.5mol% PVA is prepared from through spinning, and the water solution temperature of PVA fibers is 80 DEG C, and molten journey is 10 DEG C, line density 200dtex, dry fracture strength is 8.5 cN/dtex, and length 30mm, PVA fiber is 2.5% in the mass concentration that oil-gas field fracturing is temporarily blocked up in liquid.
Embodiment 7：A kind of oil-gas field fracturing temporarily blocks up liquid, it is made up of PVA fibers, guanidine glue, water and other components, PVA fibers are by the degree of polymerization 1400, alcoholysis degree 90.0mol% PVA is prepared from through spinning, and the water solution temperature of PVA fibers is 60 DEG C, and molten journey is 12 DEG C, line density 6.5dtex, dry fracture strength is 4.5cN/dtex, and length 20mm, PVA fiber is 3.0% in the mass concentration that oil-gas field fracturing is temporarily blocked up in liquid.
Embodiment 8：A kind of oil-gas field fracturing temporarily blocks up liquid, it is made up of PVA fibers, water and other components, PVA fibers are by the degree of polymerization 2200, alcoholysis degree 85.5mol% PVA is prepared from through spinning, and the water solution temperature of PVA fibers is 50 DEG C, and molten journey is 8 DEG C, line density 8.5dtex, dry fracture strength is 4.5 cN/dtex, and length 14mm, PVA fiber is 1.3% in the mass concentration that oil-gas field fracturing is temporarily blocked up in liquid.
Embodiment 9：A kind of oil-gas field fracturing temporarily blocks up liquid, includes thickening agent, water, crosslinking agent, acid and PVA fibers；PVA fibers are prepared from by the degree of polymerization 2000~3500,80~90mol% of alcoholysis degree PVA through spinning, and the molten journeys of PVA fibers is 30~40 DEG C, water solution temperature is 80~90 DEG C, and the mass concentration temporarily blocked up in oil gas field in liquid is 0.5~2.5%.200~400dtex of line density of PVA fibers, it is 1~10 cN/dtex to do fracture strength, and 100~200mm of length, thickening agent uses the mass concentration of guanidine glue, guanidine glue in oil gas field temporarily stifled liquid for 0.5~1.0%, and crosslinking agent uses mass ratio 2~3：0.5~1 boric acid and aluminum nitrate；Acid is citric acid.
Embodiment 10：A kind of oil gas field well cementation agent, by PVA fibers, guanidine glue, water and other material compositions, PVA fibers are by the degree of polymerization 1800, alcoholysis degree 92.0mol% PVA is prepared from through spinning, and the water solution temperature of PVA fibers is 80 DEG C, and molten journey is 12 DEG C, line density 8.5dtex, dry fracture strength is 5.8 cN/dtex, and mass concentration of length 50mm, the PVA fiber in oil gas field cements the well agent is 3.0%.
Embodiment 11：A kind of oil gas field well cementation agent, by PVA fibers, water and other material compositions, PVA fibers are by the degree of polymerization 2400, alcoholysis degree 95.0mol% PVA is prepared from through spinning, and the water solution temperature of PVA fibers is 120 DEG C, and molten journey is 23 DEG C, line density 4.5dtex, dry fracture strength is 6.8 cN/dtex, and mass concentration of length 25mm, the PVA fiber in oil gas field cements the well agent is 1.8%.
Embodiment 12：A kind of oil gas field well cementation agent, include thickening agent and PVA fibers, PVA fibers are by the degree of polymerization 2500~3500,95~99.9mol% of alcoholysis degree PVA is prepared from through spinning, the molten journey of the PVA fibers is 1~15 DEG C, water solution temperature is 40~60 DEG C, 0.1~50dtex of line density of PVA fibers in oil gas field well cementation agent, dry fracture strength is 1~10 cN/dtex, 2~30mm of length, mass concentration of the PVA fibers in oil gas field cements the well agent is 1.5~2.5%, and thickening agent uses the mass concentration of guanidine glue, guanidine glue in oil gas field cements the well agent for 0.5~1.0%.
Embodiment 13：PVA fibers of the present invention are mainly made by following steps：
（1）Prepare spinning solution：By the degree of polymerization 1000~3500,80~99.9mol% of alcoholysis degree polyvinyl alcohol is dissolved in the solution of dimethyl sulfoxide (DMSO) and water, and the mass concentration of polyvinyl alcohol in the solution is 10~30%, dimethyl sulfoxide (DMSO)：Water=55~85：1~20, dissolved 5~10 hours under the conditions of 90~110 DEG C of temperature, pressure -0.05~0.10MPa, in pressure filtration, deaeration, spinning solution is made；
（2）Spinning：By spinning solution at 90~110 DEG C, enter the filtering of candle wick filter after measuring pump-metered, subsequently into the spinneret spinneret being arranged in -20~-5 DEG C of coagulating bath, as-spun fibre is made, spinning solution is not more than 2 seconds from 90~110 DEG C of measuring pump to -20~-5 DEG C of spinneret time, spinneret is platinum material, 0.01~0.20mm of spinneret orifice diameter, coagulating bath is dimethyl sulfoxide (DMSO), second alcohol and water, mass concentration of the dimethyl sulfoxide (DMSO) in coagulating bath is 50~150g/L, mass concentration of the ethanol in coagulating bath is 100~250 g/L, mass concentration of the water in coagulating bath is 20~100g/L.
（3）Spinning is post-processed：As-spun fibre through it is damp and hot stretch, extract, oil, the process such as dry after PVA fibers of the present invention are made, wherein solvent during damp and hot stretching is ethanol, temperature is 15~30 DEG C, and extractant is ethanol, 15~30 DEG C of temperature.
Embodiment 14：The prop-carrying capacity that sand method verifies fracturing fluid is taken using static, is carried out at room temperature in the lab,
The prop-carrying capacity of the fracturing fluid of embodiment 5 is detected, it is as a result as follows：The rate of settling（cm/min）0.009~0.025, the row of returning 1.7~2.0h of end time.As can be seen that the prop-carrying capacity of fracturing fluid fracturing fluid of the present invention is good.From the point of view of the row's of returning time after terminating with regard to pressing crack construction, two or three talent is generally wanted to return drained, and our product is drained with regard to that can return in 2 hours after having used, good need not wait two hours.Just from the point of view of the row's of returning efficiency, the row's of returning efficiency of fiber of the present invention has been used to increase substantially.Just return from the point of view of discharge opeing silt content, used the discharge opeing silt content of returning of fiber of the present invention significantly to lower.In addition, for oil gas well yield, having used the Oil/gas Well of fracturing fluid of the present invention, its yield can improve more than 50%.
Claims (18)
1. a kind of oil-gas field fracturing liquid, it is characterised in that：Contain PVA fibers in the oil-gas field fracturing liquid, the PVA fibers are prepared from by the degree of polymerization 1000~3500,80~99.9mol% of alcoholysis degree PVA through spinning.
2. oil-gas field fracturing liquid as claimed in claim 1, it is characterised in that：The molten journey of the PVA fibers is 1~50 DEG C.
3. oil-gas field fracturing liquid as claimed in claim 2, it is characterised in that：The water solution temperature of the PVA fibers is 20~150 DEG C.
4. oil-gas field fracturing liquid as claimed in claim 3, it is characterised in that：0.1~1000dtex of line density of the PVA fibers, it is 1~10 cN/dtex to do fracture strength, and mass concentration of length 2~200mm, the PVA fiber in oil-gas field fracturing liquid is 0.1~5.0%.
5. the oil-gas field fracturing liquid as described in any one of Claims 1 to 4, it is characterised in that：The molten journey of the PVA fibers is 40~50 DEG C, water solution temperature is 120~150 DEG C, and its mass concentration in oil-gas field fracturing liquid is 0.5~2.5%.
6. oil-gas field fracturing liquid as claimed in claim 5, it is characterised in that：The oil-gas field fracturing liquid is aqua type fracturing fluid, including thickening agent, crosslinking agent, gel breaker and PVA fibers, the thickening agent uses acrylamide and guanidine glue, mass concentration of the thickening agent in oil-gas field fracturing liquid to be 1~1.5 for the mass ratio of 0.1~0.8%, acrylamide and guanidine glue：2~4.
7. oil-gas field fracturing liquid as claimed in claim 5, it is characterised in that：The crosslinking agent uses mass ratio 1~2：0.2~0.5 borax and zinc sulfate；The gel breaker uses mass ratio 1：2~3 ammonium persulfate and potassium permanganate.
8. a kind of oil-gas field fracturing temporarily blocks up liquid, it is characterised in that：The oil-gas field fracturing temporarily blocks up fiber containing PVA in liquid, and the PVA fibers are prepared from by the degree of polymerization 1000~3500,80~99.9mol% of alcoholysis degree PVA through spinning.
9. as claim 8 oil-gas field fracturing temporarily blocks up liquid, it is characterised in that：The oil-gas field fracturing temporarily block up liquid in PVA fibers water solution temperature at 20~150 DEG C；The molten journey of the PVA fibers is 1~50 DEG C.
10. as claim 9 oil-gas field fracturing temporarily blocks up liquid, it is characterised in that：0.1~1000dtex of line density of the PVA fibers, it is 1~10 cN/dtex to do fracture strength, and length 2~200mm, PVA fiber is 0.1~5.0% in the mass concentration that oil-gas field fracturing is temporarily blocked up in liquid.
11. as claim 10 oil-gas field fracturing temporarily blocks up liquid, it is characterised in that：The molten journey of the PVA fibers is 30~40 DEG C, water solution temperature is 80~90 DEG C, and the mass concentration temporarily blocked up in oil gas field in liquid is 0.5~2.5%.
12. as claim 11 oil-gas field fracturing temporarily blocks up liquid, it is characterised in that：The diverting agent includes thickening agent, crosslinking agent, acid and PVA fibers；The thickening agent uses the mass concentration of guanidine glue, the thickening agent guanidine glue in oil gas field temporarily stifled liquid for 0.5~1.0%.
13. as claim 12 oil-gas field fracturing temporarily blocks up liquid, it is characterised in that：The crosslinking agent uses mass ratio 2~3：0.5~1 boric acid and aluminum nitrate；The acid is citric acid.
The agent 14. a kind of oil gas field is cemented the well, it is characterised in that：Contain PVA fibers in the oil gas field well cementation agent, the PVA fibers are prepared from by the degree of polymerization 1000~3500,80~99.9mol% of alcoholysis degree PVA through spinning.
The agent 15. oil gas field as claimed in claim 14 is cemented the well, it is characterised in that：PVA fibers water solution temperature is at 20~150 DEG C in the oil gas field well cementation agent；The molten journey of the PVA fibers is 1~50 DEG C.
The agent 16. oil gas field as claimed in claim 15 is cemented the well, it is characterised in that：0.1~1000dtex of line density of PVA fibers in the oil gas field well cementation agent, it is 1~10 cN/dtex to do fracture strength, and mass concentration of length 2~200mm, the PVA fiber in oil gas field cements the well agent is 0.5~2.5%.
The agent 17. oil gas field as claimed in claim 16 is cemented the well, it is characterised in that：The molten journey of the PVA fibers is 1~15 DEG C, water solution temperature is 40~60 DEG C, and the mass concentration in oil gas field cements the well agent is 1.5~2.5%.
The agent 18. oil gas field as claimed in claim 17 is cemented the well, it is characterised in that：The oil gas field well cementation agent includes thickening agent and PVA fibers；The thickening agent uses the mass concentration of guanidine glue, the thickening agent guanidine glue in oil gas field cements the well agent for 0.5~1.0%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610225000.0A CN107286922A (en) | 2016-04-12 | 2016-04-12 | A kind of oil-gas field fracturing liquid containing PVA fibers, oil gas field well cementation agent and oil-gas field fracturing diverting agent |
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| CN201610225000.0A CN107286922A (en) | 2016-04-12 | 2016-04-12 | A kind of oil-gas field fracturing liquid containing PVA fibers, oil gas field well cementation agent and oil-gas field fracturing diverting agent |
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| CN107286922A true CN107286922A (en) | 2017-10-24 |
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Application publication date: 20171024 |