What material is used for casing plugging?
In oil and natural gas extraction and underground engineering construction, casing plugging is a key link to ensure the integrity of the wellbore and prevent fluid leakage. Choosing appropriate sealing materials directly affects the safety and efficiency of the project. This article will combine the popular technical discussions in the past 10 days on the entire network, summarize the commonly used materials and their characteristics for casing plugging, and provide structured data comparison.
1. Main types of materials for casing plugging
According to application scenarios and performance requirements, casing plugging materials can be divided into the following categories:
| Material type | Main ingredients | Applicable scenarios |
|---|---|---|
| cement based materials | Portland cement, additives | Permanent sealing, high pressure environment |
| chemical gel | Polymers, cross-linking agents | Temporary blocking, quick response |
| Mechanical packer | Rubber and metal components | Recyclable sealing |
| Intumescent material | Resin, expanded particles | Irregular wellbore filling |
2. Performance comparison of popular materials
In recent industry forums, cement-based materials and chemical gels have received the most attention. Here is a detailed comparison of the two materials:
| parameters | cement based materials | chemical gel |
|---|---|---|
| Curing time | 12-48 hours | 10-30 minutes |
| Compressive strength | 30-60 MPa | 5-15 MPa |
| Temperature resistance | ≤150℃ | ≤90℃ |
| cost | low | high |
3. Application cases and trend analysis
1.Cement-based material upgrade: Recently adopted by an oil fieldNano modified cement, the compressive strength is increased by 40%, becoming a technical hot spot.
2.Environmentally friendly gel attracts attention: Biodegradable polymer gel trialled in North American shale gas wells to reduce environmental impact.
3.Composite blocking solution: The "double insurance" model that combines mechanical packers and chemical gels has increased its application rate in deep well projects by 25%.
4. Material selection suggestions
The following factors need to be considered when selecting materials based on construction needs:
•permanently blocked: High-strength cement-based materials are preferred.
•emergency repair: Fast-curing chemical gels are more suitable.
•Environmental requirements: Pay attention to the research and development of new degradable materials.
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