SY/T 7481-2020 in English
VALIDTechnical specification of oily sludges treatment and disposal for oil&gas exploitation production
- Issued on:2020-10-23
- Implemented on:2021-02-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$136.00
Introduction
Standard Background and Scope of Application
This standard establishes technical specifications for the entire process from collection and temporary storage to final disposal of oily sludge generated during the production of unconventional oil and gas such as shale gas and coalbed methane. It is applicable to the pollution control of oily drill cuttings (oil content ≤ 10%) from onshore operations and oily mixtures from oil and gas processing.
Core term analysis
| Term | Definition | Processing technology |
|---|---|---|
| Thermal desorption | Heating to 300-500℃ to volatilize hydrocarbons | Applicable to oil-containing drill cuttings |
| Solvent desorption | Physical and chemical separation at room temperature | Environmentally friendly solvent required |
| Chemical hot washing | Reagent + hot water three-phase separation | Wastewater needs to be reused |
Key technical requirements
1. Collection and temporary storage specifications
- Use impermeable storage tanks or special containers to control VOC volatilization
- The impermeability coefficient of the temporary storage facility is ≤10-7cm/s
- The transfer vehicle must be equipped with a GPS positioning system
2. Treatment technology route
Case: The thermal desorption + solvent extraction combined process of the shale gas field in southern Sichuan has reduced the oil content of drill cuttings from 8% to 0.5%, and the recovered oil is used to configure new drilling fluid.
Resource utilization path
| Residue oil content | Utilization method | Standard requirements |
|---|---|---|
| ≤2% | Brick/roadbed materials | GB 36600 heavy metal limit |
| ≤1% | Cement kiln co-disposal | GB 30485 emission standard |
Implementation suggestions
- Establish a full life cycle ledger management system for oily sludge
- Give priority to thermal desorption equipment with low energy consumption and high recovery rate
- Landfills should be equipped with double-layer HDPE impermeable membrane + leachate collection system
Standard Evolution Analysis
Compared with SY/T 7301-2016, this standard adds solvent desorption technical requirements, refines resource utilization paths, and strengthens environmental monitoring requirements after the temporary storage facilities are closed.
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