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J.S. Gudmundsson , I. Durgut Norwegian University of Science and Technology 7491 Trondheim

PRESSURE PULSE ANALYSIS OF FLOW IN TUBING AND CASING OF GAS LIFT WELLS ”New Generation of Flow Measurements”. J.S. Gudmundsson , I. Durgut Norwegian University of Science and Technology 7491 Trondheim J. Rønnevig, K. Korsan, H.K. Celius Markland AS 7462 Trondheim ASME/API Gas Lift Workshop

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J.S. Gudmundsson , I. Durgut Norwegian University of Science and Technology 7491 Trondheim

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  1. PRESSURE PULSE ANALYSIS OF FLOW IN TUBING AND CASING OF GAS LIFT WELLS”New Generation of Flow Measurements” J.S. Gudmundsson, I. Durgut Norwegian University of Science and Technology 7491 Trondheim J. Rønnevig, K. Korsan, H.K. Celius Markland AS 7462 Trondheim ASME/API Gas Lift Workshop February 5-6, 2002, Houston

  2. Contents of Paper Introduction Rapid Pressure Pulses Field Tests (offshore wells) Flow Condition Analysis Gas Lift Analysis Flow on tubing-side Flow on casing-side Conclusions

  3. Pressure Pulse Technology • Production Testing • Flow Condition Analysis • Wells and Flowlines • Field Tested Offshore • On-Demand Testing • Quick-Acting Valve • Pressure Transducers • Patented World-Wide • Licensed to Markland

  4. A B Pressure B B A A LAB Time

  5. A B A B Time Pressure

  6. Pressure Pulse Production TestingNo Calibration Needed Δp (Pa) = ρ u a a (m/s) = ΔL/ Δt G (kg/s.m2) = ρ u w (kg/s) = G A w (kg/s) = Δp A/a

  7. Pressure Pulse FLOW CONDITION ANALYSIS A quick-acting valve stops the flow. The wellbore pressure drop needed to overcome wall friction becomes available as static pressure at wellhead. This change in pressure propagatescontinuously at the speed of sound back to the wellhead. The resulting pressure-time log can be used in flow condition analysis. In-house rapid pressure transient and speed of sound models and commercial wellbore flow model used (convert to pressure-distance log).

  8. Wellbore Flow Condition Analysis

  9. Pressure Pulse Gas Lift Analysis • Vertical well 3500 m deep • Tubing ID 0.1 m • Gravity oil 32 API, gas 0.85, water 1.103 • GOR 50 Sm3/m3, WC 50% • WHP 50 bara • Liquid production rate 400 Sm3/d • Gas injection rate 100 MSm3/d • Valves 1100 m, 1750 m and 2100 m depth

  10. gas injection production 2100 meters 1100 meters 1750 meters 3500 meters

  11. gas injection gas injection gas injection 2100 meters 2100 meters 2100 meters 2600 meters 3500 meters 3500 meters 3500 meters (a) (c) (b)

  12. CONCLUSIONS”New Generation Flow Measurements” • In pressure pulse flow condition analysis, pressure-distance log obtained from expert analysis of measured pressure-time log. • Simulations presented for detection and monitoring of deposits in pipes and wells, and to identify depth to bubble point in wellbore. • Simulations presented of pressure-distance logs (pressure surveys) obtained on tubing-side and casing-side. • Operating gas lift valves (1100, 1750 and 2100 m) identified and liquid level (2100, 2600 and 3500 m) determined.

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