ACID STIMULATION CASE STUDY

Transcription

1 ACID STIMULATION CASE STUDY 07/03/2018

2 AGENDA Introduction Rigless system overview Operational considerations Case Study Interference Test objectives & Equipment Interference Test results Summary Conclusion Acid Stimulation Case Study Offshore Well Intervention West Coast of Africa 7th March

3 OBJECTIVES Hear how a recent scheduled program of well stimulation using flexible downline led to optimized recovery offshore Nigeria Analyze why a standard ROV support vessel was used for effective production enhancement (stimulation) and interference testing Uncover why a flexible downline was used rather than coiled tubing to bullhead acid and discuss applications for your own well intervention projects Acid Stimulation Case Study Offshore Well Intervention West Coast of Africa 7th March

4 CONTEXT OF STIMULATION OPERATIONS IN DEEPWATER Economics ROI Oil price flux 4C&D Total E&P Directive to reduce DW Operating costs by 50% Rig rates at pre-2015 highs Increased Drilling Rig Efficiency (but high rates) OML 57 Warri O U I OML 58 I Port Harcourt Emphasis on Rigless Solutions Xmas Tree Installation Well Interventions OPL 215 Y A OML OML 112 OML 100 OML 102 OPL km OPL 246 JDZ OML 130 Egina & Akpo OPL 247 OPL 221 OPL 222 USAN Challenging Environment Acid Stimulation Case Study Offshore Well Intervention West Coast of Africa 7th March

5 RIGLESS SYSTEM OVERVIEW Modify Existing Equipment Package 1 Tree Running Tool Adapt from Xmas Tree Lifting installation tool to pump through tool for hydraulic access to the well Pressure measurement Isolation Guiding Principles Simplicity is King! Low Cost a priority Use of existing resources Use of existing contracts where possible Good enough approach Purchase Additional Equipment Package 2 Rigless Deployment System Fluid conduit to subsea XT Emergency disconnect Rental vs Purchase of deployment package Choice between hose and coiled tubing (less fatigue, experience using AAH on vertical XT systems, hose sections lower replacement costs) Use Existing systems 2 3 Pumping equipment under existing contract Work with in field OIMR contractor for Engineering and Planning Include rigless stimulation as part of vessel contractual scope 1 Secure economic Production Increment Acid Stimulation Case Study Offshore Well Intervention West Coast of Africa 7th March

6 OPERATIONAL CONSIDERATIONS FPSO maintains control of the Xmas Tree and DHSV Some key aspects of the operation planning and Execution Well Control and Barriers ROV Control Definition of Roles and Responsibilities Operational Reviews and Risk assessments FPSO Control Contingency Planning FPSO to vessel communication Risk Assessment and Management Acid Stimulation Case Study Offshore Well Intervention West Coast of Africa 7th March

7 RIGLESS STIMULATION - CASE STUDY Case Study: - Well A: Single Producer Fracpack, 44m perforated interval, 0% BS&W. - Problem description: Loss of PI, suspected fines migration, and carbonate scaling - Treatment: Clay acid, evolution of treatment over the life of well. - Implementation: Bullhead treatment with N 2 diversion Results - PI Increase from 12 to 90 sm3/day/bar - Cost savings vs rig ~9 MUSD - Successful operation with no incident and minimal NPT Acid Stimulation Case Study Offshore Well Intervention West Coast of Africa 7th March

8 EGINA INTERFERENCE TESTS Why? - Cost reduction initiative: perform Water Injector Xmas Tree installation and Injectivity test from OIMR vessel - Gather information for placement of future wells in highly faulted Egina reservoir structure When? - Before Egina first oil What? - Cycle open reservoir isolation valve - Injectivity test to estimate well productivity - Interference testing to assess reservoir connectivity and assess fault behavior How? - Deploy downline and connect to Xmas Tree same connection - Manufacture mini IWOCS for control Xmas Tree and completion valves (No FPSO) and permits quick ESD Increased OIMR vessel functionality Acid Stimulation Case Study Offshore Well Intervention West Coast of Africa 7th March

9 SURFACE EQUIPMENT FOR EGINA SCOPE - Filtration Spread - Pumping Spread - Deployment (RDS) - XT Access & Control Reel Deployment System (RDS) 2 downline & deployment chute Mini IWOCS and control umbilical Filtration unit Pumps, tanks and chemicals spread REX - Rigless Injectivity & Interference Tests in EGINA Field - NIGERIA 9

10 SUBSEA EQUIPMENT FOR EGINA SCOPE - Filtration Spread - Pumping Spread - Deployment (RDS) - XT Access & Control Flying Lead Interface System (FLIS) 1. Emergency quick disconnect of the injection line 2. Modified low torque ROV actuated Modified Tree Running Tool (TRT) 1. Injection access to the Xmas Tree production bore Umbilical Termination Head (UTH) 1. Control umbilical weak link 2. Interface fro EFL & HFL Subsea Router Module (SRM) 1. Conversion of signal from MRM to Ethernet REX - Rigless Injectivity & Interference Tests in EGINA Field - NIGERIA 10

11 INJECTIVITY & INTERFERENCE RESULTS Egina A Injectivity Criteria Budget Realized Cost 1.43 M$ 1.94 M$ Duration 9.0 d 9.2 d 1% NPT Including demobilization time: 5 days 8 bpm pump rate Transient II ~ 610 sm3/d/bar Cost estimated OIMR vs. rig: MUSD Egina E Interference Egina G Interference observed on Egina G 0.1 bars increase after ~5 days Egina H Interference observed on Egina H 0.05 bars increase after ~10 days REALIZED SAFELY, IN TIME, IN BUDGET & ACHIEVED INJECTIVITY REX - Rigless Injectivity & Interference Tests in EGINA Field - NIGERIA 11

12 SUMMARY OF RIGLESS OPERATIONS RESULTS Operations 4 interference/injectivity tests performed under budget 13.6M USD in savings 5 rigless stimulation operations performed - ~30M USD savings Well Budget M$ Realized M$ Budget days Realized days Egina A Egina B Egina C Egina D Well Realized M$ Realized days Akpo stim # Akpo Stim # Akpo Stim # Akpo Stim # Akpo Stim # EGINA Injectivity Test - Progress Chart Evolution Days Perform Survey, ROV basket deployment & XT Tree Cap removal 4 Deploy & Install Modified TRT 5 Deploy Deadweight & SRM 6 Deploy Downline & Control Umbilical 7 Open the Well & Shut down Tests 8 Injectivity Operation 9 Fall-Off Test 10 Well Preservation 11 Well Suspension 12 Subsea Disconnection of Downline, UTH, SRM, XT & Flying Leads 13 Recover Equipment 14 Time evolution Realised Time BW06.1 (days) Realised Time BW07 (days) Realised Time BW06.2 (days) Recover Clumpweight Realised Time BW27 (days) Cummulative Time AFE (days) Perform as Left Survey Time evolution Akpo Stim#9 Akpo Stim#10 Akpo Stim#11 Akpo Stim#12 Akpo Stim#13 Stimulation, Interference/Injectivity tests using OIMR vessel validated Acid Stimulation Case Study Offshore Well Intervention West Coast of Africa 7th March

13 CONCLUSION Challenging environment Maximise returns on OPEX and maintain 100% rig utilization Cost savings achieved ~ 45 MUSD ~3000 bpd gained from stimulation on Akpo wells Data from Egina interference used in future well placement Injectivity test results confirm water injector wells injectivity index Continuously extend light well intervention scope next wireline in open water Non-self supporting down line a good choice(cheap and effective), not the ideal choice. Case by case evaluation for each application Open to new ideas for the next frontier on well intervention cost reduction. Constrained by flow rate through 2 downline Risk vs reward of performing diagnostic interventions Open to new ideas. Acid Stimulation Case Study Offshore Well Intervention West Coast of Africa 7th March

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