Knot

The Degradable Temporary Plugging Knot (commonly referred to as "Knot") is an innovative temporary plugging and steering product specifically developed for hydraulic fracturing operations. Unlike traditional spherical temporary plugging balls that only seal round perforations, our knot's irregular fiber-woven structure conforms to and effectively plugs both circular and irregularly shaped perforation holes, ensuring reliable zonal isolation during diversion fracturing. We have developed a full series of knot products covering three temperature ranges: low temperature (20–60°C), medium temperature (60–90°C), and high temperature (90–150°C), adapting to diverse downhole conditions. All grades exhibit excellent dissolution and degradation properties in wellbore fluids. Currently available standard sizes include: 14–16mm, 16–18mm, 18–20mm, 20–22mm, and 26–28mm. Custom sizes and dissolution rates can be manufactured to match specific well conditions and operational timelines. The knot consists of two main components: the knot body and the protective spherical shell. The knot body is woven from high-strength degradable fibers and provides the primary plugging function, expanding slightly when exposed to wellbore fluids to create a tight seal against perforation edges. The spherical shell is injection-molded from degradable polymer and protects the fiber body during deployment through the wellbore, then degrades within a specified time to release the fiber knot for plugging action. Both components are fully degradable and non-toxic, leaving no residue after stimulation.

1. Effective Sealing of Irregular Perforations

The fiber-woven knot structure conforms to both round and irregularly shaped perforation holes, providing reliable sealing where traditional spherical plugging balls fail. This ensures effective diversion in wells with eroded, elongated, or non-uniform perforations.

2. Full Degradability, Zero Residue

Both the fiber knot body and polymer spherical shell are manufactured from fully degradable materials that dissolve completely in wellbore fluids within 24–72 hours (depending on grade and temperature). Degradation products are non-toxic and easily circulated out with flowback fluid - eliminating mill-out operations, coiled tubing costs, and residue-related formation damage.

3. Four Temperature Grades, Wide Adaptability

Available in four grades - F20 (40–60°C), F60 (60–100°C), F80 (90–100°C), and F100 (90–150°C) - covering low, medium, and high temperature wells. Each grade is formulated for optimal degradation rate and pressure retention at its target temperature range.

4. High Pressure Retention

The compressed fiber structure delivers pressure bearing capacity up to 50MPa (F20 grade) and 70MPa (F60/F80/F100 grades), maintaining reliable zonal isolation during high-pressure fracturing operations.

5. Five Standard Sizes + Customization

Standard sizes: 14–16mm, 16–18mm, 18–20mm, 20–22mm, 26–28mm. Custom sizes, fiber formulations, and degradation rates available to match specific casing sizes, perforation dimensions, and operational requirements.

6. Simple Deployment, No Special Tools

The knot is deployed via standard pumping methods - no specialized setting tools or wireline equipment required. The protective spherical shell ensures smooth pump-down through the wellbore, then degrades at depth to activate the fiber plugging body.

The Degradable Temporary Plugging Knot operates in three stages:

1. Deployment Stage

The knot (with protective spherical shell intact) is pumped down the wellbore with fracturing fluid. The smooth spherical shell ensures unobstructed passage through tubing and casing, protecting the fiber body from premature abrasion or hydration during transit.

2. Plugging & Diversion Stage

Upon reaching the target zone, the polymer shell begins to degrade in the wellbore fluid at downhole temperature, releasing the fiber-woven knot body. The fiber structure expands slightly and lodges against perforation holes - conforming to both round and irregular shapes - creating a tight, pressure-resistant seal. This isolates the already-fractured zone, redirecting fracturing fluid to unstimulated zones for diversion fracturing.

3. Degradation Stage

After fracturing operations are complete, both the fiber body and remaining shell material continue to degrade in the wellbore chloride fluid. Within 24–72 hours (depending on grade and temperature), the entire knot dissolves completely into non-toxic byproducts that are circulated out during flowback - restoring full wellbore drift diameter with no milling, coiled tubing, or cleanout intervention required.

All Degradable Temporary Plugging Knots are manufactured and tested under strict quality control:

• Raw material inspection - degradable fiber tensile strength test, polymer melt flow rate verification, and composition analysis per batch

• Dimensional inspection - knot diameter, shell thickness, and weight verification per drawing tolerances

• Degradation testing - dissolution time verification in standardized brine at specified temperature, with complete dissolution confirmed

• Pressure testing - compressive strength test at rated pressure (50MPa or 70MPa) with zero structural failure

• Packaging inspection - vacuum-sealed moisture-proof packaging with desiccant, labeled with grade, size, batch number, and expiration date

We provide:

• 12-month product quality warranty from date of shipment

• Custom formulation and size development based on specific well conditions

• Technical support for deployment parameters (pumping rate, dosage calculation, degradation time matching)

• Each shipment includes material test report (MTR), degradation test certificate, and operating guidelines

• Third-party inspection (BV/SGS) available on request

• New Well Completion & Multi-Stage Fracturing

Used for temporary zonal isolation and diversion during plug-and-perf or sliding sleeve fracturing operations in horizontal and deviated wells. The knot seals perforated intervals to redirect stimulation fluid to untreated zones, improving fracture network complexity and reservoir coverage.

• Re-Fracturing of Existing Wells

Ideal for refracturing operations where existing perforations are often eroded or irregularly shaped - the fiber-woven structure seals these non-uniform holes more reliably than spherical plugging balls, enabling effective restimulation of depleted zones.

• Shale Gas & Tight Oil Stimulation

Widely used in unconventional reservoir development where temporary plugging and diversion technology is critical for maximizing stimulated reservoir volume (SRV) in long horizontal wellbores with multiple perforation clusters.

• Temporary Zonal Isolation

Provides short-term isolation between zones during well testing, acidizing, or workover operations, then degrades automatically without intervention.

• Low-Permeability Reservoir Development

Suitable for low-permeability sandstone and carbonate reservoirs where diversion fracturing is required to bypass near-wellbore damage and access virgin reservoir rock.

Q: What is the difference between a plugging knot and a traditional temporary plugging ball?

A: Traditional plugging balls are spherical and only seal round perforations reliably. Our plugging knot has an irregular fiber-woven structure that conforms to and seals both round and irregularly shaped perforations - including eroded or elongated holes common in older or refractured wells. The knot also degrades completely, whereas some plugging balls may require milling.

Q: How long does the knot take to degrade?

A: Degradation time depends on the grade and downhole temperature: F20 (≤24h at 40–60°C), F60 (24–72h at 60–100°C), F80 (≤24h at 90–100°C), F100 (24–72h at 90–150°C). Custom degradation rates are available.

Q: What sizes are available?

A: Standard sizes: 14–16mm, 16–18mm, 18–20mm, 20–22mm, 26–28mm. Custom sizes can be manufactured to match specific perforation dimensions.

Q: What pressure can the knot withstand?

A: F20 grade: ≥50MPa. F60/F80/F100 grades: ≥70MPa. The actual pressure retention depends on downhole temperature, fluid chemistry, and perforation geometry.

Q: How is the knot deployed?

A: The knot is pumped downhole with fracturing fluid using standard pumping equipment - no specialized setting tools or wireline required. The protective spherical shell ensures smooth passage through the wellbore. Recommended pumping rate and dosage are provided in the operating manual based on well parameters.

Q: Is the knot compatible with all fracturing fluids?

A: The knot degrades in chloride brine (KCl/NaCl) and standard fracturing fluids. Compatibility with specific fluid additives (crosslinkers, breakers, surfactants) should be verified prior to use - our technical team can provide compatibility testing.

Q: What is the MOQ and delivery time?

A: MOQ is 100 pieces for standard products. Delivery time is 7–15 working days for standard sizes/grades and 15–25 working days for customized products. We ship from Shanghai or Ningbo port.

Q: How should the knots be stored?

A: Store in original vacuum-sealed packaging in a dry, cool environment (below 25°C, relative humidity <60%), away from direct sunlight and moisture. Shelf life is 6 months from manufacture when stored under recommended conditions.

Hot Tags: knot, China knot manufacturers, suppliers, factory, conductors for oilfield tools, chelating agents for oilfield tubing accessories, demulsifiers for oilfield pumping unit accessories, blowers for oilfield tools, manifolds for oilfield tools, Knot