SY/T 5087-2017 in English

Background of Standard Revision and Technological Evolution

This standard has achieved three major upgrades after replacing the 2005 version: protection system integrity (newly added design/construction/inspection chapters), comprehensive equipment coverage (supplemented requirements for logging/well logging/cementing equipment), and emergency response standardization (detailed ignition procedures and evacuation standards). The main technical changes are reflected in:

Core safety technical requirements

1. Key control points in the design phase

• Wellbore structure: The depth of the upper casing shoe in the sulfur-containing layer must exceed the bottom of the production layer by 100m
• Drilling fluid density: The safety additional value of the H2S-containing formation is the upper limit (0.15g/cm³ for gas wells)
• Well control device: A shear gate blowout preventer must be installed if the sulfur content is ＞1.5g/m³

2. Equipment configuration standards

Mandatory configuration includes:

• Fixed monitoring system (5 monitoring points including square well/drilling platform/circulation tank)
• Sulfur-resistant pipes (yield strength ≤784MPa, hardness ≤22HRC)
• Positive pressure respirator (1 set per person + 20% spare)

Implementation suggestions and common problems

1. Risk management matrix

2. Typical violation cases

• Problem: A well did not set up a backup emergency channel according to Article 5.1.4
• Consequence: Evacuation was blocked due to wind direction change when H2S leaked
• Rectification: It is necessary to ensure that at least one channel is available when the wind direction changes by 90°

Special requirements for emergency response

Graded response standards:

• 30mg/m³: Suspend operation and investigate the cause
• 150mg/m³: Initiate evacuation procedure
• 1500mg/m³: Remote ignition must be used

Note: Offshore facilities must simultaneously implement the SY/T 6633 emergency signal standard.