Agenda. Plunger lifting with SC-SSSV 1 st application in NAM. Why What How Follow-up

Transcription

1 Plunger lifting with SC-SSSV 1 st application in NAM September 17 th, 28 Ewout Biezen, Willem Dekker, NAM Bill Hearn, Weatherford Agenda Why What How Follow-up 1

2 Why: Background Need for effective deliquification of mature wells with SC-SSSV within NAM Current plunger technology is used worldwide to efficiently unload LL wells More gains than normal Pressure build-up due to automatic cycle and efficient unloading Cheaper than other deliquification methods New plunger technology designed to mitigate for tubing ID restriction Safety valve (obstruction) Plunger cycle Lowest plunger running depth Significant liquid hold-up in tubing What: Operating Cycle 1. Loaded: Plunger hangs in open position at top Liquid in liner+tubing builds up Flowrate declines 2. Shut-in Well automatically shuts in (ROV) Plunger falls down through the liquid 3. Shut-in build-up Plunger reaches bottom and closes Short build-up 4. Unloading (plunger travel) Well automatically opens (ROV) P lifts plunger+liquid in closed position 5. Plunger hangs in open position at safety valve, flowing well

3 HOW: SafetyLift System Components The SafetyLift System is comprised of four major components: Bottom Hole Assembly Plunger Upper Landing Assembly Remote operated valve with Controller Unit 5 HOW: Testing Apparatus A test well was built for this project Inverted Double Bumper spring Clear Plastic for viewing Compressor with considerable horsepower to deliver gas rates for testing 3

4 HOW: SafetyLift System Components Bottom Hole Assembly Specific to DAL - 4 Standard Double Bumper Spring Cross over for Go Stop Go Stop w/ Extension for Mandrel (not shown on Diagram) MP-1 Standing Valve Optional Installed using standard wireline procedures Installed at a pre-determined depth in relation to the well perforations 7 HOW: SafetyLift System Components Patented Padded SafetyLift Bypass Plunger Body Components machined to drift through 2.75 diameter of the Safety Valve Landing Nipple T-Pad Elements specially designed for increased collapse Plunger designed with fewer connections than standard plunger for increased reliability. 8 4

5 HOW: SafetyLift System Components Final Upper Spring Design MP-1 Standing Valve threaded directly to tubing retrievable SSSV Inverted Bumper Spring designed for SafetyLift plunger. Installed directly attached to SSSV in one run. 9 HOW: SafetyLift System Components Controller Control system to determine plunger arrival in upper assembly: Flowing THP, system pressure and flow rate measured Typical peaks in signals identified and arrival determined P r e s s u r e / F l o w R a te Cycles with Casing Sway Casing Tubing Differential Line Flow Rate T im e Point where Casing and Tubing are closest 15 psi diff. 3 PSI greater difference Time 5

6 Production Cycles Plunger lift Development and 1 st installations Timeline: LL-conference: project possibility identified First Design Second Design Denver conference: idea was born NAM 3.5 Candidate wells identified Lab-Tests Lab-Tests Plunger installation in 2 NAM wells Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q Automatic Intermittent Production installed on 2 NAM wells: ROV on manifold + controller Evaluation 6

7 Installations DAL-4 and DAL-5 DAL-4 & 5 installed in two days, wireline only DAL-4 unloaded near-wellbore region DAL-5 appeared to run dry -> Plunger fished, inspected Plunger did not run all the way down -> scaling and/or deviation Installation pulled, planning to remove scale from tubing DAL-4 plunger checked as well, no damage at all Results DAL-4, 1 st week Short cycles to unload near wellbore region Hourly 1/8/28 2:24:45 DAL2-FT NM3/D DAL2-PT barg /8/8 7/8/8 8/8/8 9/8/8 1/8/8 Wellhistory 7

8 Results DAL-4 Production went from ~12, to 2, Nm3/d Trouble-free operation, 3+ cycles and counting.. 3, DAL-4 3 Daily production [Nm3] 25, 2, 15, 1, 5, Day total FTHP Plunger Installation Flowing Tubing Head Pressure [bar] 1-Jan 2-Feb 1-Apr 3-May 19-Jul 7-Sep 27-Oct Way forward Monitor DAL-4 performance, check plunger condition after 6 months or sooner when performance deteriorates DAL-5: Pickle tubing with acid to remove scale build-up acid job planned Improve standing valve design for high deviations done, valve will be spring-loaded Q4: Re-run plunger system, evaluate Future candidates: 4 on shortlist (mainly sour gas wells) Expand beyond land asset 8

9 SafetyLift System QUESTIONS? 17 9