Cast Iron Bridge Plug | API 11D1 | 10,000 PSI | Well Abandonment & P&A

The Cast Iron Bridge Plug (CI BP) is a high-pressure downhole isolation tool specifically engineered to reliably isolate sections of oil and gas wells for both permanent and temporary applications. Manufactured from high-grade drillable cast iron, the plug provides exceptional pressure and temperature resistance - with 5,000 PSI and 10,000 PSI ratings available and temperature capability up to 400°F (204°C) with high-performance elastomers - making it particularly well-suited for well abandonment (P&A), squeeze cementing, casing pressure testing, and high-temperature zonal isolation where composite or dissolvable alternatives may be cost-prohibitive or temperature-limited. The plug features heat-treated full-circle slips (with an optional double-slip configuration available) that anchor securely to the casing wall, multi-element rubber packing elements with anti-extrusion backup rings that provide reliable annular sealing, and a ratcheting lock ring that maintains setting force for a permanent seal until intentional drill-out. Pinned cones prevent premature setting during deployment, and the top vent design equalizes pressure across the plug during milling - preventing sudden pressure release and ensuring safe, controlled drill-out without pipe rotation. Setting is accomplished using conventional wireline pressure setting tools, drill pipe, or coiled tubing, with full compatibility with Baker and GO setting equipment. The plug is available for a wide range of casing and tubing sizes from 2-3/8" to 20", with custom slips available for Q-125 casing grades and multiple elastomer options including standard Nitrile, Viton, HSN, and Aflas for specific temperature and chemical compatibility requirements. Designed and tested to API 11D1 specifications with ISO 14310 validation grades V3 through V6, the cast iron bridge plug is a trusted, cost-effective solution for operators requiring dependable wellbore isolation - particularly for permanent abandonment where long-term seal integrity and regulatory compliance are paramount, and for high-temperature wells where alternative plug materials may not be suitable.

1. Drillable Cast Iron Construction for Cost-Effective Isolation

Crafted from high-grade drillable cast iron, the plug provides robust mechanical strength and pressure containment during service, while remaining drillable with conventional thru-tubing milling tools (mills and motors) or coiled tubing when wellbore access is required. The cast iron material offers superior high-temperature resistance compared to many composite alternatives and is the most cost-effective bridge plug option for permanent well abandonment (P&A) and long-term zonal isolation applications. Custom corrosion-resistant cast iron alloys are available for H2S/CO2 and high-chloride environments.

2. High Pressure and Temperature Rating

Available in 5,000 PSI and 10,000 PSI pressure ratings (8,000 PSI for larger casing sizes), the plug supports differential pressures up to 10,000 PSI (68.95 MPa / 689.5 bar). Temperature ratings reach up to 400°F (204°C) with high-performance elastomers (Viton, HSN, Aflas), while standard Nitrile elastomers are rated to 300°F (149°C). This broad pressure-temperature envelope makes the cast iron bridge plug suitable for deep wells, geothermal applications, and high-temperature steam injection wells where lower-temperature-rated plugs may fail.

3. Secure Anchoring with Anti-Premature-Setting Design

Equipped with one-piece heat-treated full-circle slips (or optional double-slip configuration) and rubber packing elements with anti-extrusion backup rings, the plug ensures secure, uniform anchoring in the casing wall and eliminates elastomer extrusion at high pressure and temperature. Pinned cones prevent premature setting during run-in, ensuring accurate depth placement every time. The ratcheting lock ring maintains compressive setting force on the packing elements after the setting tool is released, providing sustained sealing force for permanent isolation service.

4. Wide Size Range with Versatile Compatibility

Suitable for tubing and casing sizes ranging from 2-3/8" to 20", and compatible with casing grades up to P-110 (with custom slips available for Q-125 grades). The plug can be set using wireline pressure setting tools, drill pipe, or coiled tubing, and is fully compatible with standard Baker and GO setting equipment - requiring no specialized tools or operator training. The versatile deployment methods make it suitable for vertical, deviated, and horizontal well applications across a broad range of wellbore sizes.

5. API 11D1 Compliance with ISO 14310 Test Validation

Designed and manufactured in accordance with API 11D1 specifications for downhole packers and bridge plugs, and validated to ISO 14310 grades V3 through V6 - including shop pressure testing to 10,000 PSI at 275°F for Nitrile elastomer configurations. Every plug undergoes material inspection, dimensional verification, hydrostatic pressure testing, and functional testing before shipment, with detailed test reports provided with each order.

6. Top Vent Design for Safe Drill-Out

The top vent design equalizes pressure across the plug during the early stages of drill-out, preventing sudden pressure release when the seal is penetrated and ensuring safe, controlled milling without pipe rotation. The compact overall length reduces total drill-out time and debris volume compared to longer plug designs. After drill-out, cast iron cuttings are circulated out of the wellbore using standard well control fluids, restoring full drift diameter for production or subsequent operations.

The Cast Iron Bridge Plug is deployed and set through a reliable mechanical process, provides sustained zonal isolation during service, and is removed by drill-out when wellbore access is needed:

Step 1: Running and Positioning

The plug is connected to a Baker or GO compatible pressure setting tool and run into the wellbore via wireline, drill pipe, or coiled tubing to the predetermined target depth. Pinned cones prevent premature setting during deployment, allowing the plug to pass through casing restrictions and deviated sections without accidental activation.

Step 2: Pressure Setting

Once on depth, the wireline pressure setting tool is activated (or hydraulic pressure is applied via drill pipe/coiled tubing), generating axial force that drives the setting cones along the mandrel. The full-circle slips (or upper and lower slips in the double-slip configuration) expand radially outward and the heat-treated slip teeth embed into the casing wall, forming a firm mechanical anchor.

Step 3: Seal Compression and Lock Ring Engagement

As setting force increases, the cones compress the multi-element rubber packing system, and the backup rings prevent elastomer extrusion under high pressure. The ratcheting lock ring engages and locks the compressed seal in place, maintaining setting force even after the setting tool is released. The pinned cones shear at the designed load, completing the setting sequence.

Step 4: Setting Tool Release

After the plug is fully anchored and sealed, the setting tool releases from the plug and is retrieved to surface. The ratcheting lock ring maintains compressive force on the packing elements, ensuring a permanent, sustained seal.

Step 5: Zonal Isolation Service

During abandonment, cementing, testing, or fracturing operations, the full-circle slips maintain plug positioning and the multi-element seal with backup rings prevents fluid cross-flow between isolated zones, sustaining differential pressure up to the rated 5,000 or 10,000 PSI across the rated temperature range.

Step 6: Drill-Out Removal

When wellbore access is required, the cast iron plug is drilled out using thru-tubing fishing equipment (mills and motors) or coiled tubing. The top vent design equalizes pressure as the mill penetrates the plug body, preventing sudden pressure release and enabling safe, controlled milling without pipe rotation. Cast iron cuttings are circulated out of the wellbore, restoring full drift diameter.

Every Cast Iron Bridge Plug is manufactured under an ISO 9001:2015 certified quality management system, designed in accordance with API 11D1 specifications, and validated to ISO 14310 grades V3 through V6. Our quality assurance process covers the full product lifecycle:

Raw Material Control

Cast iron billets are sourced from approved foundries and accompanied by material test reports (MTR) verifying chemical composition, tensile strength, hardness, and microstructure. Each batch undergoes spectroscopic analysis and mechanical property testing. Elastomer materials (Nitrile, Viton, HSN, Aflas) are tested for hardness, tensile strength, compression set, and fluid compatibility before release to production. Heat-treated slips are inspected for hardness and tooth integrity.

In-Process Manufacturing Control

Cast iron bodies are machined on precision lathes and machining centers with documented process parameters. Critical dimensions - outer diameter, seal groove dimensions, slip tooth geometry, cone angles, lock ring fit, and top vent function - are inspected at first-article, in-process, and final inspection stages using calibrated micrometers, bore gauges, and coordinate measuring machines.

Performance Testing

• Hydrostatic Pressure Test: Each plug is assembled and tested at rated differential pressure (5,000 or 10,000 PSI) at specified temperature with zero visible leakage as the pass criterion

• Setting Function Test: Sample plugs from each production lot are set in test casing to verify slip expansion, seal compression, lock ring engagement, and pin shear

• Top Vent Function Test: Each top vent is tested for correct pressure equalization function

• Dimensional Inspection: 100% verification of critical mating dimensions against engineering drawings

• ISO 14310 Validation: Grades V3–V6 testing available, including shop testing to 10,000 PSI at 275°F for Nitrile configurations

Warranty and Support

We provide a 12-month warranty from the date of shipment against manufacturing defects in materials and workmanship. Our engineering team provides 24-hour online technical support for product selection, running procedures, drill-out parameter guidance, and field troubleshooting.

1. Well Abandonment (P&A) - Permanent Zonal Isolation

The cast iron bridge plug is the industry-standard tool for permanent well abandonment (plug and abandonment, P&A) operations, providing long-term, pressure-rated isolation of hydrocarbon-bearing zones, aquifers, and depleted formations. The ratcheting lock ring maintains sustained seal force over decades of service, and the cast iron construction offers superior long-term stability and temperature resistance compared to composite or dissolvable alternatives. Available in 5K and 10K ratings with high-temperature elastomer options, the plug helps operators meet environmental and regulatory requirements for permanent well decommissioning. Multiple plugs can be set at different depths as part of a multi-barrier abandonment system, often in conjunction with cement plugs.

2. Squeeze Cementing Operations

The plug serves as a reliable downhole barrier during primary and remedial squeeze cementing operations, isolating target zones to ensure accurate cement placement and preventing cement displacement into non-target formations. The high-pressure rating (up to 10,000 PSI) withstands squeeze cementing pump pressures, and the multi-element seal with backup rings prevents cement bypass. After cement curing, the plug can be drilled out to enable perforation and production, or left in place as part of a permanent abandonment barrier.

3. Casing Pressure Testing and Integrity Verification

The cast iron bridge plug provides a tight, pressure-rated seal for casing pressure testing, leak testing, and casing integrity verification before completion or production operations. The plug is set below the test interval, pressure is applied from surface, and casing integrity is verified against measured pressure decay. The top vent design allows safe pressure equalization and drill-out after testing is complete. This application is critical for verifying casing integrity before high-pressure fracturing or injection operations.

4. Multi-Stage Hydraulic Fracturing (Lower-Cost Alternative)

For operators seeking a lower-cost zonal isolation option for multi-stage fracturing, the cast iron bridge plug provides reliable pressure containment up to 10,000 PSI at a lower unit cost than composite or dissolvable frac plugs. After all fracturing stages are complete, the plugs are drilled out in a single coiled tubing run. While drill-out time is longer than composite plugs (typically 45–90 minutes per cast iron plug vs. 10–30 minutes for composite), the significantly lower purchase cost makes the cast iron option economically favorable for wells where rig time is not the primary cost driver.

5. Temporary Zonal Isolation for Stimulation and Workover

The plug is used for temporary wellbore isolation during acid stimulation, water shutoff, zone testing, and workover operations, isolating target formations to prevent fluid cross-flow and ensure accurate treatment placement. The broad size range (2-3/8" to 20") and multiple elastomer options (Nitrile, Viton, HSN, Aflas) make it suitable for a wide range of well conditions, including high-temperature wells and corrosive environments. After operations, the plug is drilled out to restore full wellbore access.

Q: What certifications does the Cast Iron Bridge Plug have?

A: The plug is designed and manufactured to API 11D1 specifications for downhole packers and bridge plugs, validated to ISO 14310 grades V3 through V6, and our facility is ISO 9001:2015 certified. Each shipment includes material test reports and pressure test certificates. CE/PED certification and third-party inspection (BV, SGS, DNV) are available on request to meet import requirements of different countries.

Q: What is the difference between cast iron, composite, and dissolvable bridge plugs?

A: Cast iron bridge plugs are metallic, offer the highest pressure and temperature ratings (up to 10,000 PSI / 400°F), have the lowest unit cost, but require the longest drill-out time (45–90 minutes per plug) and generate metal cuttings. Composite bridge plugs use non-metallic composite bodies, drill out faster (10–30 minutes), are lighter and more corrosion-resistant, but have lower temperature limits and higher cost. Dissolvable bridge plugs degrade completely in wellbore fluids with no drill-out required, but are the most expensive option. Cast iron plugs are preferred for permanent abandonment (P&A), high-temperature wells, and cost-sensitive operations; composite for standard fracturing where fast drill-out matters; dissolvable for extended-reach wells where coiled tubing access is limited.

Q: What is the drill-out time for a cast iron bridge plug?

A: Drill-out time depends on plug size, milling tool type, and well conditions, but typically ranges from 45–90 minutes per plug using conventional thru-tubing milling tools (mills and motors) or coiled tubing. The top vent design equalizes pressure during drill-out for safe, controlled milling without pipe rotation. We provide recommended drill-out parameters (rotation speed, weight-on-bit, fluid properties) with each order.

Q: What casing sizes and pressure ratings are available?

A: The plug is available for casing and tubing sizes from 2-3/8" to 20", covering the majority of production, intermediate, and conductor casing sizes. Pressure ratings are 5,000 PSI (standard) and 10,000 PSI (high-pressure), with 8,000 PSI ratings for larger casing sizes. Custom outer diameters, lengths, and pressure ratings can be manufactured to order. The plug is compatible with casing grades up to P-110, with custom slips available for Q-125 grades.

Q: What elastomer options are available?

A: Standard elastomer is Nitrile (NBR), rated to 300°F (149°C). High-performance options include Viton (FKM), HSN (hydrogenated nitrile), and Aflas, rated up to 400°F (204°C) with enhanced chemical resistance for H2S, CO2, and aromatic hydrocarbon environments. Elastomer selection should be based on downhole temperature, fluid chemistry, and expected service duration - our engineering team can recommend the appropriate elastomer for your specific well conditions.

Q: What setting methods and tools are compatible?

A: The plug supports three setting methods: wireline pressure setting, drill pipe setting, and coiled tubing setting - with both mechanical and hydraulic options available. It is fully compatible with standard Baker and GO pressure setting tools, which are widely used in global oil and gas operations. No specialized equipment or operator training is required.

Q: What is the MOQ, delivery time, and sample policy?

A: The MOQ is 1 piece for standard models. We provide free samples for standard models (1–2 pieces, customer covers shipping cost); customized samples require a sample fee that is deductible from subsequent orders. Standard products ship within 7–15 working days after deposit; customized sizes, pressure ratings, or elastomer configurations require 20–30 working days. We ship from Shanghai or Ningbo port. Payment terms include T/T (30% deposit, 70% before shipment), L/C at sight, and Western Union, negotiable based on order quantity.

Q: Can the cast iron bridge plug be reused?

A: No. The cast iron bridge plug is designed for one-time use. It can be removed by drilling out after use, but the drill-out process destroys the plug structure, so it cannot be reused. If you require a reusable isolation tool, we recommend our Retrievable Bridge Plug, which can be set, retrieved, and redressed for multiple runs.

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