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Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO.

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Presentation on theme: "Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO."— Presentation transcript:

1 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Gaslift Management in PDO Northern Directorate By Adi Al Naamani Harith Al Naabi 1

2 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Introduction Designs, Improvements, Opportunities and challenges Gaslift management and processes Automatic Validation Tester (AVT) and Wireless gaslift trial Overview per area and examples Conclusion Gaslift Management in PDO Agenda 2

3 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Location Country size 312,000 km2 Population 2.3 million Accelerated development 75 % income depends on hydrocarbon IRANIRAQ Eygpt Sudan Libya Saudi Arabia Turkey 3

4 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO People 4

5 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO People 5

6 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Beaches & Wadis 6

7 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO MUSCAT Sur Sohar Salalah ARABIAN SEA GULF OF OMAN 100 km PDO (since 66) is a JV between 60 % Government of Oman 34 % Shell 4 % TotalFina 2 % Partex Shell is technical advisor Production 700 kb/d (90% of Omans Oil production) 66 producing stations 117 oil producing fields Over 3000 active wells 620 gaslift strings. 28% of production, 200,000 bbl/d 85% of gaslift production from North Majority of fields under water flood Petroleum Development Oman 7 N S

8 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Gaslift wells in the Northern Directorate The North of PDO has primarily carbonate reservoirs with depths varying from as shallow as 800m to 2700m deep. Now there are approximately 500 Gaslift wells constituting 50% of the oil producers. In the North, Gaslift wells produce 45% of the oil and 42% of the gross. 8

9 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Design Design in most wells has 2 to 5 mandrels, depending on well depth and expected deepest operating point IPO valves are run in >95% of the wells Mostly unloading valve sizes are the same as the orifice valve size. Redesigns are done where well behaviour becomes too unstable, parameters change 9

10 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Initial Performance Operating @ mandrel 2 (through unloading valve) Later Performance Operating @ mandrel 4 Future Performance after on-stream of Water Injector Operating @ mandrel 3 (through unloading valve) 10

11 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Optimisation and Challenges Well by Well –Unstable wells –Leaking valves or tubing –Well integrity (e.g. leaking casing) –Possibility to lift deeper –Scale clean outs Group optimisation –Surface controlled gaslift rates through SCADA / DCS –Set-points based on optimal distribution of liftgas using WinGLUE –Deferment reduction through re-distribution of liftgas 11

12 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Challenges w.r.t. optimal distribution of liftgas –Measurements (especially gas) are of insufficient quality. Flowing surveys are therefore essential –Well integrity problems has Impact on well models –Continuous changes in the reservoir pressure, PI, water cut etc. –The dynamics of reservoir not captured in well models. –Young & bright, but in-experienced production engineers. Solutions –Dedicated production engineers on well integrity –Surveillance engineers responsible for only 50 - 70 wells in total –Intensive training and bringing in coaches Optimisation and Challenges 12

13 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Process Dedicated gaslift process –Monitor and trouble shoot using SCADA and test data –Understand the problem and correct –Further investigation –Analyse results of investigation –Determine improvement potential, costs and justify activity. –Design new gaslift string and schedule activity –Set valves, test valves before running & test retrieved valves with AVT tester and feedback –Kick off the well and evaluate the results –Review and file report 13

14 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO PDO Gaslift Management Set-up Gaslift Control Gaslift Metering Reservoir Data Well Data Production Data Tubing pressure Casing pressure SCADA SGAS-CAO Direct monitoring & Control of Individual Wells DCS Controls Gaslift rates to the wells WinGLUE Gaslift optimisation Software 14

15 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO WinGLUE gaslift QC database set up Automated links Central storage of gaslift analyses Most wells available in the SCADA system (RTAP / SOFS or the latest PC based FIELDWARE). AVT tester is used for QC valves before running and recently pulled valves Process Improvements 15

16 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Implemented in the well services workshop TROP, stem travel, R ratio etc. Rejected at agreed tolerances, e.g. TROP difference < 15 PSI >25% of the valves were rejected on TROP. Visible improvements Testing of pulled valves just started. >60% fail on leaking bellows. Keep track of a problem log to increase understanding Network connection is essential Staff in the well services more conscious Deckers Automatic Validation Tester (AVT ) 16

17 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Specific Overview per Area Area A Constrained due to flaring restriction (no compressor ullage) Workshop was organised Deliverables of the workshop: –Coaching / training –Saving of 3.6 million scf/d of liftgas –Well integrity problems found and repaired –Detailed gaslift surveillance was carried out and many wells were stabilised –Many gaslift measurements wrong and corrected –For 2003 the estimated impact on production is approximately around 1200 bbl/d. 17 L

18 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Specific Overview per Area Area B In Area B, test data quality is an issue Some wells were found quit Some wells found with scale obstruction. Cleaned out and restored. Total increase in the Area B was 600 bbl/d or 10% of the total gaslift production. 3% 2002 & 2003 year average impact. 18 Q

19 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Well was tested 2000 bbl/d net oil, low BSW through 3 1/2 Tubing upsize was expected to double production Flowing survey could only be matched with 1200 bbl/d and tubing upsize was canceled Theoretical pressures Actual pressures Example of importance of F/S 200 bbl/d gain from switching on gaslift 19

20 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Specific Overview per Area Area C Area C consists of two large fields Field N has mostly natural producers. –Flow limited by Gas Oil Gravity Drainage (GOGD) –N compressors are full. Cutting back liftgas investigated. Field C is partly water-flood and partly GOGD Workshop held. Opportunities found: –Reduce liftgas consumption to free up compressor space (cutting back lift-gas, running velocity strings, 3 1/2 to 2 7/8 tubing) –Some wells without RTUs 20 F

21 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Wireless Gaslift Valves Trial Area C Wireless gaslift valves (2) were installed in a well in Field C in 2002. Communication through a modem with PC in CCR and Main Office Down-hole pressures and temperatures displayed Full control from the desktop was achieved Live optimisation Modem on bottom valve broke down, but still operating. Confirmed bad batch of modems (50%) 21 F

22 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Wireless Gaslift Valves Trial Area C Business case for large scale implementation being made, but –15 - 20 times higher costs than conventional gaslift –Even with one third of costs, large scale implementation means 16,000 bbl/d extra production is required or 8% of production. Most promising to replace PPO valves & IPO running it as part of new well or existing well work-overs. 22 F

23 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Specific Overview per Area Area D Advanced automation; surface control valves linked to the DCS & SCADA. Full control and optimisation. Main challenge is well integrity and continuously changing well performance. Additional people have been put on the job in Area D (surveillance engineers). They complement the work of the other production engineers. Coaches brought in 23 Y

24 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Specific Overview per Area Area D - Well Examples 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 25-Apr Tubing PressureCasing Pressure 0 1000 2000 3000 4000 5000 6000 28-May Tubing PressureCasing Pressure 0 100 200 300 400 500 600 700 Mar-03 Apr-03 May-03 Gross m3/dNet m3/dGas Lift x 100 m3/d Surging pressure before Optimisation Stable operation after Optimisation Maintain Production with 50% less Liftgas 24Y

25 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Specific Overview per Area Area D - Well Examples 0 1000 2000 3000 4000 5000 6000 7000 22-Sep Tubing PressureCasing Pressure 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 28-May Tubing PressureCasing Pressure 0 50 100 150 200 250 300 350 400 450 500 Jan-03 Feb-03 Mar-03 Apr-03 Gross m3/dNet m3/dGas Lift x 100 m3/d Surging pressure before Optimisation Stable operation after Optimisation Production increase of 350%. 25 Y

26 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO Conclusion Reduction in Liftgas usage (~36 mln scf/d) Cost savings on Gaslift compressor requirements. Enabled production of high GOR wells Create compressor capacity to handle new oil producers. Stabilising wells, Reduce flaring In some cases lifting deeper Sum of the measurable initial production increases after activities in 2003 is around 4500 bbl/d (2% of total North) Year average value is 0.7%. 26

27 Adi Al Naamani and Harith Al Naabi PDO 2004 Spring Gaslift workshop Houston - 10 & 11 February 2004 Petroleum Development Oman Gaslift Management in PDO What is happening next …..? Further enhance staff competence and skills Complete implementation of the AVT tester Trial new technology such as Bubble breaker, Bubble gaslift and surface controlled gaslift valves Bringing in a dedicated production engineer for gaslift Continue with the efforts, because it pays back. 27


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