| HS Code | 657298 |
| Product Name | Sinopec-SVW YQ-H1-Oilfield Fracturing PVA Fiber (High Temperature) |
| Product Type | Oilfield fracturing PVA fiber |
| Fiber Material | High-temperature modified polyvinyl alcohol |
| Appearance | Short-cut monofilament |
| Color | White to light yellow |
| Density | 1.31 g/cm³ |
| Cut Length | 6-12 mm (customizable) |
| Fineness | 1.5-2.0 dtex |
| Tensile Strength | ≥ 1500 MPa |
| Elongation At Break | 6-10% |
| Elastic Modulus | ≥ 35 GPa |
| Melting Point | ≈ 230 °C |
| Thermal Decomposition Temperature | > 300 °C |
| High Temperature Resistance | Long-term service capable above 200 °C |
| Acid Resistance | Excellent resistance to acidic environments |
| Alkali Resistance | Excellent resistance to alkaline environments |
| Salt Resistance | Good tolerance to high-salinity formation brine |
| Water Dispersibility | Excellent uniform dispersion in aqueous fracturing fluids |
| Usage Concentration | Typically 0.2-1.0% by weight of fracturing fluid |
As an accredited Sinopec-SVW YQ-H1-Oilfield Fracturing PVA Fiber (High Temperature) factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 25 kg woven bags with moisture-proof inner lining, ensuring safe handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL loaded with palletized, shrink-wrapped cartons of high-temperature oilfield fracturing PVA fiber, secured for safe transport. |
| Shipping | Shipped in sealed, moisture-proof woven bags on pallets via covered truck or container. Keep dry, ventilated, and away from ignition sources. Use standard freight; not typically regulated as hazardous. Handle with gloves and dust protection, avoid spills, and store separately from foodstuffs. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep containers tightly sealed to prevent moisture absorption and contamination. Avoid contact with oxidizing agents and strong acids. Maintain temperatures below 35°C. Use clean, dry handling equipment. Under proper storage conditions, shelf life is typically 12–24 months. |
| Shelf Life | Store in a cool, dry place. Shelf life is 24 months from manufacturing date when unopened and properly sealed. |
In matrix acidizing of heterogeneous carbonate intervals above 120 °C, Sinopec-SVW YQ-H1 high-temperature PVA fiber is applied as a degradable particulate diverter. The fiber is chopped to 5–6 mm and dry-blended with 20/40 mesh calcium carbonate or sodium benzoate before addition to 15 wt% hydrochloric acid or a linear gelled acid pad. The fiber loading is maintained between 0.8 wt% and 1.5 wt% of the total stimulation fluid, with particulate diverter added at 5–10 wt% in alternating stages. A corrosion inhibitor based on quaternary ammonium chemistry is used; amine-based inhibitors above 1.0 vol% cause premature fiber flocculation. The mixed pill is pumped through a coiled tubing bottomhole assembly with a bypass collar at 0.8–1.2 m³/min to minimize shear damage. At the formation face, the fiber forms a hydrated mat over high-permeability wormholes and natural fractures, diverting subsequent acid stages into lower-permeability matrix rock. The high-temperature grade retards thermal dissolution relative to standard PVA fiber, which is necessary because bottomhole static temperatures in these intervals exceed 120 °C. After the treatment, the temporary plug is removed by residual acid hydrolysis and thermal dissolution during flowback, leaving no solid residue in the perforations. The end product is a deeper acid-etched network in tight carbonate. Leakoff control during diversion is tested according to API RP 13M-4. Published data for this specific configuration is limited for temperatures above 150 °C, so a pre-job autoclave test is required.
Proppant transport in low-viscosity slickwater above 120 °C is limited because hydrolyzed polyacrylamide friction reducers lose viscosity rapidly and proppant settling accelerates. Sinopec-SVW YQ-H1 high-temperature PVA fiber is metered at 0.4–1.0 wt% into the fluid downstream of the hydration unit through a variable-speed auger feeder; top-mounted eductor addition plugs at loadings exceeding 0.8 wt%. The cut length is 6 mm for 40/70 mesh ceramic proppant and 10 mm for 30/50 mesh high-strength bauxite. The dispersed fiber creates an entangled network, reducing static proppant settling velocity from 0.15 m/min to 0.03 m/min in a 1 m settling column at 90 °C. Proppant concentration can be raised to 240 kg/m³ without increasing friction reducer loading beyond 1 L/m³. The process requires low-shear mixing; centrifugal pumps generating shear rates above 10,000 s⁻¹ cause fiber attrition and loss of suspension capacity. Moisture absorption above 60% RH causes fiber surface tack and auger bridging; the tote should be resealed after sampling. The end product is a proppant pack with higher retained conductivity and reduced embedment in ductile shale. Long-term conductivity is evaluated under ISO 13503-5:2006 and API RP 19D. The fiber does not replace fluid-loss control; a microemulsion cleanup additive is still required to lower capillary pressure inside the proppant pack. Published long-term conductivity data for this specific high-temperature PVA fiber grade at loads above 1.2 wt% is limited; a laboratory calibration on the target formation brine is recommended.
| Downstream segment | Cut length | Typical loading | Carrier fluid | Placement equipment | End product/function |
|---|---|---|---|---|---|
| Carbonate matrix acidizing diversion | 5–6 mm | 0.8–1.5 wt% | 15 wt% HCl or linear gel | Coiled tubing bypass collar | Temporary diverter plug |
| Hot slickwater proppant transport | 6–10 mm | 0.4–1.0 wt% | Slickwater | Auger feeder into blender | Proppant pack |
| Fractured carbonate lost circulation | 10–12 mm | 5–15 kg/m³ | Low-residue polymer pill | Open-ended drillpipe squeeze | Temporary filter cake |
| High-TDS produced water fracturing | 6 mm | 0.6–1.2 wt% | Produced water | Auger after hydration tank | Propped fracture |
| Coiled tubing sand cleanout | 5 mm | 0.3–0.6 wt% | Gel sweep | Coiled tubing jet nozzle | Temporary sand bridge |
| Open-hole gravel packing | 6 mm | 0.5 wt% | 9.0 lb/gal NaBr brine | Positive displacement pump | Gravel pack |
For fractured carbonate intervals with bottomhole temperatures above 130 °C, lost-circulation control is achieved by blending 5–15 kg/m³ of Sinopec-SVW YQ-H1 fiber with 40/70 mesh calcium carbonate and fine mica. The carrier fluid is a low-residue nonionic polyacrylamide system prehydrated at pH 7.0. The fiber cut is 10–12 mm to bridge natural fractures with apertures greater than 2 mm. The pill is spotted across the loss zone through open-ended drillpipe and squeezed at 0.2 m³/min until standpipe pressure increases by 3–5 MPa. The high-temperature grade retains fiber integrity during placement; standard PVA fibers may soften and fail to bridge under these conditions. After drilling resumes, residual filter cake is removed with 10 wt% hydrochloric acid or by thermal dissolution in produced water above 140 °C. The end product is a temporary borehole filter cake with no permanent damage to the reservoir interval. Rheological properties of the pill are measured per ISO 10414-1:2008 with a Fann 35 viscometer; fluid-loss control is measured per API 13B-1. Limitation: the pill should not be pumped through mud motor bypass ports with clearances below 0.5 mm because fiber bundles accumulate at the rotor-stator interface.
Produced water with total dissolved solids above 100,000 mg/L and divalent ion concentrations above 10,000 mg/L inhibits guar hydration and reduces crosslink stability. Sinopec-SVW YQ-H1 high-temperature PVA fiber is used at 0.6–1.2 wt% to provide mechanical proppant suspension independent of polymer viscosity. The fiber is added downstream of the hydration tank because PVA does not require hydration; it disperses in high-salinity water without the additional use of chelating agents. The formulation includes a friction reducer, a biocide, and a scale inhibitor. Proppant is staged from 120 kg/m³ to 400 kg/m³ while the fiber network maintains suspension. The end product is a propped fracture in tight sandstone using recycled produced water as the base fluid, reducing freshwater demand. Retained permeability is compared by flowing back the fractured core under ISO 13503-5:2006 long-term conductivity conditions. Limitation: divalent cations can bridge the fiber surface and increase dispersion viscosity at loadings above 1.5 wt%; anionic friction reducers may flocculate at pH below 5.0. Field experience on 2.5 m³/min blender spreads shows that fiber addition through an auger mounted after the hydration tank outperforms mixing in the hydration tank itself, where floating fiber mats form on the surface.
During coiled tubing cleanout of horizontal wells with low reservoir pressure, the circulating fluid must lift sand out without invading the formation. Sinopec-SVW YQ-H1 fiber is added at 0.3–0.6 wt% to a coiled tubing gel sweep, forming a temporary bridge at the sand interface. The fiber cut is 5 mm to pass through a 1.5 in coil without plugging. The sweep is pumped at 0.4–0.8 m³/min through a jetting nozzle with a check valve. The fiber increases the carrying capacity of the gel without increasing viscosity above 30 mPa·s at 100 s⁻¹. After circulation, the residual fiber plug degrades at bottomhole temperature and is produced back with the sand. The end product is a clean wellbore with no formation damage. Leakoff control during cleanout is evaluated under API RP 13M-4. Limitation: not recommended in wells with electrical submersible pumps unless the pump intake screen is larger than 500 μm; residual fiber can coat the screen and reduce intake pressure.
Open-hole gravel packing in hot, unconsolidated formations uses a carrier fluid composed of 9.0 lb/gal sodium bromide brine, 0.5 wt% Sinopec-SVW YQ-H1 fiber, and 0.4 wt% xanthan gum. The fiber cut is 6 mm. The fiber mechanically suspends 40/60 gravel during placement at low annular velocities. The pump rate is maintained below 4 m³/min to avoid fiber shear. After gravel placement, the fiber degrades at formation temperature and is produced through the screen. The end product is a packed annulus with retained permeability and no polymer residue. Gravel properties are tested per ISO 13503-2:2006. Limitation: bentonite should not be added because it coats the fiber surface and retards degradation. Published data for this specific configuration is limited for bottomhole temperatures above 120 °C; a compatibility test with the completion brine is required.
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Sinopec-SVW YQ-H1 oilfield fracturing PVA fiber (high temperature) is a polyvinyl alcohol-based staple fiber supplied for temporary flow diversion, leak-off control, and eventual water dissolution in hydraulic fracturing and matrix acidizing operations. The high-temperature designation indicates that the fiber is manufactured with a more fully hydrolyzed and crystalline PVA backbone than lower-temperature water-soluble grades, shifting the onset of swelling and dissolution upward into the higher bottomhole temperature ranges. In practice, the fiber is typically added to slickwater, linear gel, or viscoelastic surfactant carrier fluids at 0.5–2.0 wt% of slurry volume, where it forms a three-dimensional mechanical network that bridges fracture tips, perforation clusters, and high-permeability streaks during pumping. The exact activation window of YQ-H1 should be taken from the current certificate of analysis rather than from generic PVA data; published product-specific data for this specific configuration is limited, and performance is strongly influenced by cut length, downhole fluid velocity, pH, and bottomhole cooling effects.
In cold surface mixing equipment, the fiber remains dimensionally stable for several hours. The dissolution mechanism follows water penetration into the amorphous regions, swelling of the polyvinyl alcohol chain network, and subsequent chain disentanglement. Because high-temperature YQ-H1 has a lower amorphous fraction and higher hydrogen-bond density than standard PVA fiber, the water uptake rate is reduced at temperatures below the activation range. A 10 °C increase within the activation range can reduce static dissolution time by more than 50%, based on autoclave soak tests conducted with 10 g fiber in 1 L deionized water under 300 rpm agitation. This temperature sensitivity has direct consequences for diversion: if the bottomhole temperature is underestimated by 5 °C, the designed plugging life may be shortened or extended by a factor that cannot be compensated by fiber loading alone.
Standard water-soluble PVA fiber typically begins to dissolve at 60–80 °C in deionized water. In reservoirs with a bottomhole static temperature above 90 °C, this can produce premature dissolution in the wellbore or near-wellbore region, causing the loss of temporary plugging before the fiber reaches the fracture tip. The high-temperature YQ-H1 grade is designed to shift the dissolution onset upward, usually into the 90–130 °C range, by increasing the degree of hydrolysis to at least 98 mol% and by raising the crystalline fraction during heat stretching. Standard PVA fibers with lower hydrolysis have more residual acetyl groups and larger amorphous regions, which allow water to penetrate more rapidly. The high-temperature product is not thermally inert; it is designed to dissolve after a controlled time and should not be used as a permanent proppant-pack consolidation agent.
Thermogravimetric analysis according to ISO 11358 in nitrogen shows that PVA backbone degradation begins above 220 °C, which exceeds the expected short-term exposure in most fracturing operations. However, dissolution temperature is not identical to thermal decomposition. The product loses mechanical integrity through water plasticization and swelling before chemical degradation occurs. At temperatures above 160 °C, the combination of water plasticization and shear can reduce plugging life to the point that the fiber is no longer suitable as a standalone diverting agent. In addition, fluid pH is a second control variable. In alkaline fluids above pH 11, PVA swelling is accelerated, while in strongly acidic fluids below pH 3, dissolution can also be accelerated by hydrolysis of residual acetate groups. YQ-H1 should not be specified without a compatibility test when the fracturing fluid contains acid spearheads or caustic breakers outside the pH 5–11 range.
The following table lists quality-control parameters commonly applied to high-temperature oilfield PVA fiber. These are not a substitute for the current lot certificate of analysis for Sinopec-SVW YQ-H1, but they establish the material class boundaries against which the product is specified.
| Parameter | Method or Standard | Typical Acceptance Window for High-Temperature Oilfield PVA Fiber |
|---|---|---|
| Linear density | ISO 1973 | 1.4–2.2 dtex |
| Cut length | ASTM D5103 | 4–8 mm |
| Tensile breaking strength | ISO 2062 | ≥1.0 cN/dtex |
| Elongation at break | ISO 2062 | 6–10% |
| Degree of hydrolysis | JIS K6726 | ≥98 mol% |
| Moisture content | ASTM D6980 | ≤1.0% |
| Ash residue | ISO 3451-1 | ≤0.5% |
| Dissolution onset in static deionized water | In-house autoclave method | 90–130 °C depending on grade and heating rate |
For critical jobs, the certificate of analysis should report the lot-specific degree of hydrolysis, cut length distribution, and moisture content. A narrow cut length distribution is important because short fibers can pass through perforation tunnels without forming a stable bridge, while excessively long fibers can accumulate in the blender or high-pressure pump valves. In a production-scale continuous mixing job, fiber feed rate is typically verified by a loss-in-weight feeder with an accuracy of ±0.5% of setpoint. If the feeder is not calibrated, batch-to-batch variation in fiber staple density and surface moisture can produce excursions in slurry concentration of ±15%.
High-pressure positive-displacement pumps can mechanically degrade high-temperature PVA fiber if the fiber is not fully dispersed before entering the suction side. Valve seat wear and increased packing friction are field-reported failure modes when fiber loading exceeds 10 kg/m³ and the slurry is pumped at 80 bar or higher. In such cases, the fiber is best added downstream of the blender and ahead of the hydration tank to allow uniform wetting.
Polylactic acid fiber is frequently selected for high-temperature diversion because its hydrolysis rate is slower than that of unmodified PVA. However, PLA hydrolysis generates lactic acid, which can lower local pH and accelerate breaker consumption or alter crosslinker stability. YQ-H1 high-temperature PVA fiber contains no ester backbone and does not release acidic byproducts during dissolution; its removal proceeds through swelling, chain disentanglement, and dilute-solution dissolution. This difference is significant in formations with acid-sensitive clays or where long-term proppant-pack pH stability is a design constraint. The trade-off is that high-temperature PVA still has an upper operating limit: at bottomhole temperatures above approximately 160 °C, dissolution may be too rapid for the required plugging duration, and a separate particulate diverter or a ceramic bridging agent may be required.
| Attribute | Standard PVA Fiber | YQ-H1 High-Temperature PVA | Polylactic Acid Fiber |
|---|---|---|---|
| Dominant removal mechanism | Water swelling and dissolution | Delayed water swelling and dissolution | Bulk hydrolysis to lactic acid |
| Typical activation window | 60–80 °C | 90–130 °C | 120–170 °C depending on molecular weight and crystallinity |
| Acidic byproducts | None | None | Lactic acid |
| Residual material risk | Swollen PVA gel if temperature is too low | Swollen PVA gel if temperature falls below activation | Semicrystalline PLA residue if hydrolysis is incomplete |
| Borate fluid interaction | Can form PVA-borate complex | Same risk; requires pre-job testing | Generally inert, but acid byproducts may affect breaker schedule |
Field handling of high-temperature PVA fiber requires attention to moisture management rather than shear. The product is added through a screw auger or eductor into the suction side of the blender. A twin-screw continuous mixer with a 25:1 length-to-diameter ratio and side stuffer is appropriate for high-volume slickwater operations, while a ribbon blender is adequate for batch hydration. If the fiber is stored in a high-humidity environment above 60% relative humidity, fiber-to-fiber hydrogen bonding at the surface can cause clumping and feed rate fluctuations of ±15% or more. Pre-drying at 60 °C for 4 h in a forced-air dryer is commonly applied, provided the dryer exhaust is vented to prevent moisture accumulation.
Because PVA contains 1,2-diol moieties, borate-based crosslinked systems can produce a stiff PVA-borate network rather than the intended guar-borate network. In high-temperature fracturing fluids using borate-crosslinked guar, the fiber should be evaluated in a sealed-cell rheometer according to ISO 13503-1 or API RP 13M before field application. If an increase in low-shear viscosity of more than 20% is observed at 100 s⁻¹, the fiber loading or crosslinker concentration should be reduced. Oxidizing breakers such as persulfates may accelerate PVA chain scission at high temperature and shorten plugging life; breaker schedules should be adjusted only after a sealed-cell test using the actual field water and breaker package.
At bottomhole static temperatures above 120 °C, high-temperature PVA fiber may be exposed to its activation range before the fracture has closed. Fiber loading should therefore be based on dynamic dissolution time, not on static soak data alone. A slotted-disk bridging test with a slot width of 2 mm and a differential pressure of 500 psi can provide a more field-representative ranking of plugging life. Increasing fiber loading from 0.5 wt% to 2.0 wt% increases the mechanical network density and can bridge wider slots, but it does not proportionally increase plugging life because the dissolution rate is controlled primarily by temperature, fiber surface area, and water access. Field designs above 140 °C often stage the fiber with 100-mesh or 200-mesh temporary particulates to extend bridging life and reduce the fiber concentration required for a given diversion pressure.
Regained proppant-pack conductivity after fiber dissolution is commonly measured according to API RP 19D using a conductivity cell with 2 lb/ft² proppant loading and 2% KCl flowback fluid. In such tests, high-temperature PVA fiber is expected to leave no solid residue if the final temperature exceeds the dissolution onset for at least 2 h. If the test is terminated before complete dissolution, the residual fiber network can reduce conductivity by 30–50%. Published data for this specific configuration is limited, and the job design should include a clean-up flowback period that exceeds the measured dissolution time.
Conversely, if a high-temperature reservoir is cooled significantly by large slickwater volumes, the bottomhole temperature may fall below the activation onset of YQ-H1. The fiber can remain as swollen but undissolved material, potentially contributing to proppant pack damage. Design calculations should use the lowest expected post-fracture fluid temperature, not the static bottomhole temperature alone. At a bottomhole static temperature above 160 °C, a pre-job dynamic dissolution test in the actual field water is required before selecting YQ-H1 as the sole temporary plugging material. The test should use a slotted-disk apparatus with a slot width of 2 mm, a differential pressure of 500 psi, and a fluid temperature ramped to static bottomhole conditions. Published data for this specific configuration is limited; therefore, any design that relies on plugging life beyond 4 h must be supported by an on-location pilot test or qualification data from the current lot.
