GLO Offshore South East Asia Steve Gas Lift

GLO Offshore South East Asia Steve ‘Gas Lift’ Gossell – MEA Senior Gas Lift Engineer

Field Review • • • Offshore 100 – 150 meter water depth Stacked Reservoirs – 1000++ ft 7” Cased Hole Depletion Drive small Compartments Some Strong Water Drive “Bottoms Up” Commingled Reservoirs Sandstone Unconsolidated 2000 -2500 m (6500 -8000 ft) TVD

Field Review • • • Compressed Gas on 90% of Platforms Gas Volume not Limited Single String Tubing 3 ½” PPO (Fluid Operated) Valves 1. 0” Spring Loaded Operating Orifice Valves made from Unloading Valves Step 1 GLO Project

Objectives Primary: • • • Change PPO to IPO Unloading Valves in 40 wells Increase Oil Production by 10% Teach Process Secondary: • Inspect all Valves Pulled • Evaluate Gas Lift Design Logic • Evaluate Gas Lift Shop & Field Operations/Facilities

Process • Dedicated GLO Slick Line Unit • Flowing Gradient Surveys Before & After Change Valves: – Before • FGS with Well Test • Static Build-up • Calibrate Well Model IPR & Match VL Correlation • Gas Lift Design & Valve Change – After • Repeat FGS with Well Test after 3 days for Stabilization • Check Model • Inspect Valves • Report

Production Results – 24 Wells

FGS Examples • Compare Before & After Results • Compare Pattern of Outflow Performance • Note Liquid Rate, Water Cut, & Draw down

66% Increase

146%

520% Increase

143%

811% Increase (Realistically 64% based on Avg. Well Test 250 bpd

Example Well Model • Strong Water Drive • Note Match from Calibrated Model to 2 nd Well Test

Load Well Test & Survey Data into Model Not a good match

Calibrate Model Good Match: Suspect total gas from separator too high, change GOR

Determine Optimum Injection Rate Nodal result from calibrated model

Match Inflow/Outflow with Optimum Lift Gas Rate

Create Gas Lift Design for Worst Case Scenario

2 nd Survey, New Design, Check Model 43% Measured Increase in Liquid Rate

Valve Inspection Results 84 PPO Valves Inspected from 27 Wells • 65% with Test Rack Open (Ptro) Set Pressure 10% or more out of Design Range. • 26% with Failed Bellows; would not open. • 46% with Leak Rates medium to very high. • 14% with Leak Rates so high could not measure Ptro. • 11% tested OK = only 1 in 9 valves passed inspection. 25 Orifices Inspected: 52% with failed bellows restricting flow.

Offshore Gas Lift Shop Facility Ptro set with Hydraulic Oil Pump

Packing Filed Down to Assist Installation 4082’ #3 2967’ #2 1851’ #1

PPO as Orifice Valve: Remove Ball Bellows failed & extended into Flow Path on 13 of 25 Orifices inspected = 52%.

PPO as Orifice Valve: Bellows extended onto seat

SCSSSV: Full Bore Flapper vs. Ball Valve

Thanks for Listening – Questions or Comments? Steve ‘Gas Lift’ Gossell – MEA Senior Gas Lift Engineer