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Determination of Fluid Loss Screen Life

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  1. Determination of Fluid Loss Screen Life API SC 10 Scott Jennings 2012 Exploration and Production Standards Conference on Oilfield Equipment and Materials

  2. Current Situation • Currently, no requirement for replacing fluid loss screen. • Sec. 10 Static fluid-loss tests • Problems noticed when testing FLAs for acceptance criteria & comparing FL data with SC. • API spec for Blade Wear: • Discard if mass loss >10 %

  3. Lab – Lab Results • Variables running the test are: • Technician – accuracy of performing FL test • Pressure delivered • Screen • Visibility • Weight • Flow rate

  4. Lab – Lab Results • Fluid loss tests that do not run a full 30 min have a potential error that becomes greater as the length of the test becomes shorter. Fluid-loss tests that run the full 30 min typically show 5 % variability. Tests that run less than 5 min. can have a variability of more than 30 %. Average of 11 tests • ARAMCO vs SC A = 15.3% • ARAMCO vs SC B = 45.8% • ARAMCO vs SC C = (-13.6%)

  5. Initial Findings • Labs discard screens at technician discretion (Vis.). • Unattended test lead to higher degree of uncertainty. • Tech. around but not totally on top of test. • N2 source should have a defined min. starting supply pressure for the static test. • regulated pressure down to 1000 psi diff. • 1200 psi on stirred FL apparatus

  6. Flow Rate Determination Procedure (New Screen) • Weigh FL screen dry • Soak in water for 2 mins. • Assemble FL cell • Fill cell with 165 gr. Water SG=1.00 • Open drain valve and start clock simultaneously • Stop clock and record time when water level has left the inside of the cell. • Dry with compressed air • Repeat steps 4-7 four more times

  7. Initial Study • 26 new screens weighed (metal backed) • Ave. 21.99 gr. • High 22.24 gr. • Low 21.52 gr • 5 screens selected for water flow test • Water gravity flow test • 165 grams of water flow through cell (SG-1.00) • 5 test times recorded (sec) • Rates calculated (ml/sec) • Best match to average was selected (screen no. 5)

  8. FL Cell

  9. Water Test

  10. New FL Screen no. 5 Selected 20 FL Tests Performed • 10 slurries selected 115-283 cc’s/30 mins. • Screen weighed before FL test • Water Flow Rate determined before FL test • 2 tests made 30 mins. • Same 10 slurries repeated 120-215 cc’s/30 mins. • Screen weight increased from 22.01 to 22.08 gr. • 4 tests made 30 mins. • Can continue if SC 10 is interested.

  11. 20 tests ran

  12. Flow Rate Determination Procedure (Used Screen) • Weigh FL screen dry • Soak in water for 2 mins. • Assemble FL cell • Fill cell with 165 gr. Water SG=1.00 • Open drain valve and start clock simultaneously • Stop clock and record time when water level has left the inside of the cell. • Dry with compressed air • Repeat steps 4-7 twomore times

  13. Used FL Screens • 13 used screens weighed (metal backed) • Ave. 20.33 gr. • High 22.59 gr. • Low 19.31 gr. • 5 screens selected for water flow test • Weight (high and low) • Visibility (best and worst) • Water gravity flow test • 165 grams of water flow through cell (SG-1.00) • 3 test times recorded (sec) • Rates calculated (ml/sec)

  14. Water Test Used Screens

  15. Future Work 21.99 New 4.03 Any Interest to Pursue?