What are process design factors for a dewatering system that receives slurry from Collection (Step 2) or Sand Cleaning (Step 3)? Below are example properties to start with in designing a dewatering system.

Slurry from Desander Accumulator (Multiphase or Liquid Type)

• Batch discharge: 15 minutes flow at 12-24 hour intervals
• Rate: Designed for 25 gpm (850 BPD)
• Solids Content: 25 wt.% average (60 wt. % peak)
• Oil Content: 1% with light oil to 10% with medium oil

Slurry from Sand Jetting

• Batch discharge: 30-60 minutes flow at 1 day to 2 week intervals
• Rate: Can vary from 100-200 gpm (3430-6860 BPD)
• Solids Content: 5 wt.% average (25 wt. % peak)
• Oil Content: 5% with light oil to 20% with medium oil

Slurry from Sand Cleaning System

• Batch discharge: 30 minutes flow after cleaning cycle
• Rate: Designed for 87 gpm (3000 BPD)
• Solids Content: 5-10 wt.% average (15 wt. % peak)
• Oil Content: <1% oil on dry sand

References:

1. Rawlins, C.H. and Wang, I. 2001. “Design and Installation of a Sand-Separation and -Handling System for a Gulf of Mexico Oil Production Facility”. SPE Production and Facilities, August, pp. 134-140. https://doi.org/10.2118/72999-PA
2. Rawlins, C.H. 2019. “Enhanced Production Through Surface Facilities Sand Management.” SPE Distinguished Lecturer presentation. Link here
3. Rawlins, C.H. “What to do with Produced Solids after Separation: Dewatering, Transport, and Disposal.”. White Paper Publication, eProcess Technologies. Link here

Next week I will cover bulk and final dewatering.