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. N 2 source should have a defined min. starting supply pressure for the static test. regulated pressure down to 1000 psi diff psi on stirred FL apparatus

6 Flow Rate Determination Procedure (New Screen) 1. Weigh FL screen dry 2. Soak in water for 2 mins. 3. Assemble FL cell 4. Fill cell with 165 gr. Water SG= Open drain valve and start clock simultaneously 6. Stop clock and record time when water level has left the inside of the cell. 7. Dry with compressed air 8. Repeat steps 4-7 four more times

7 Initial Study 26 new screens weighed (metal backed)  Ave gr.  High gr.  Low 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 New Fluid Loss Screens Time for 165 ml to pass through 325 mesh screen 12345AveRate Time (sec)ml/sec H L A Screen Weight Average time for all H -HeavyL -LightA -Average

10 20 FL Tests Performed 10 slurries selected 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 cc’s/30 mins.  Screen weight increased from to gr.  4 tests made 30 mins. Can continue if SC 10 is interested. New FL Screen no. 5 Selected

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13 20 tests ran

14 Flow Rate Determination Procedure (Used Screen) 1. Weigh FL screen dry 2. Soak in water for 2 mins. 3. Assemble FL cell 4. Fill cell with 165 gr. Water SG= Open drain valve and start clock simultaneously 6. Stop clock and record time when water level has left the inside of the cell. 7. Dry with compressed air 8. Repeat steps 4-7 two more times

15 13 used screens weighed (metal backed)  Ave gr.  High gr.  Low 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) Used FL Screens

16 Water Test Used Screens Used Fluid Loss Screens Weight ScreenGramsVisibility123Ave.Rate No.Time (sec)ml/sec Worst ml left < Low High Best

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22 Future Work Any Interest to Pursue? New 4.03