7th European Conference on Gas Well De-liquification Groningen, 2012 WELL DELIQUIFICATION & REVIVAL USING SURFACE JET PUMPS Recent applications and experience By: Sacha Sarshar ,Caltec MAIN CAUSES OF LIQUID BUILD UP IN WELLS • Low velocity of gas • High back pressure on well, dictated by downstream pipeline & process system • Multiphase flow through well bore , leads to flow regimes such as Churn flow, slugging etc,which affect both the hydrostatic head and frictional losses • The flowing bottom hole pressure(FBHP) is the main factor affecting production, but FWHP is a guide • Inclined & horizontal profile of wells contribute to gas- liquid separation and generation of slugs; liquid build up in pipelines could also aggravate the problem Slide 2 Dispersed Bubble d i u ) Intermittent s q / i m L ( COMPARISON OF l a y Annular Mist i t c i FLOW REGIMES IN c i f o r e l HORIZONTAL AND e p V u Wave VERTICAL PIPES S Stratified Superficial Gas Velocity (m/s) Slug d iu ) q s / i m L ( Annular Mist la y Bubble i t c i i c f o r e l e p V u S Froth V ≥ 5 m/s Slide 3 SEVERITY AND EXTENT OF LIQUID BUILD UP • CASES WHEN LOWERING THE FWHP IS SUFFICIENT TO REVIVE THE WELL- EFFECTIVENESS AT WHAT FWHP or FBHP? • CASES WHEN AN INITIAL DELIQUIFICATION IS NEEDED ,FOLLOWED BY OPERATION UNDER A LOWER FWHP ,USING SURFACE JET PUMPS • SEVERAL OPTIONS EXIST FOR THE INITIAL DELIQUIFICATION SUCH AS USE OF FOAMING AGENTS OR USE OF DOWNHOLE SYSTEMS. • SEVER CASES WHEN A DOWNHOLE SOLUTION IS NEEDED,BUT THE SJP CAN ALSO HELP THE PROCESS Slide 4 GENERAL SOLUTIONS TO WELL DE-LIQUIFICATION • Regular gas blow down to atmosphere • Lower flowing wellhead pressure ( use of jet pump technology) • Well shut in Intermittently • Use of foaming agents • Tubing size modification/velocity string • Artificial lift systems (Downhole) including downhole jet pumps • Best solution is dictated by well status,resevoir characteristics, available source of energy, platform constraints and economic consideration Slide 5 Surface Jet Pump(SJP) Technology Patented Universal Design Ejector / Jet Pump Removable Removable Mixing tube /Diffuser Nozzle Some possible HP sources- ; - HP WELLS (oil or gas wells) - COMPRESSOR RECYCLED GAS - HP GAS FROM PROCESS SYSTEM - A SINGLE PHASE (LIQUID) PUMP - HP LIQUID(OIL,WATER) Slide 6 MAIN FACTORS AFFECTING THE PERFORMANCE ~ HP/LP PRESSURE RATIO GAS/LIQUID RATIO(LP FLOW) ~ ~ HP/LP FLOW RATIO (oil or gas production cases) Secondary factors; - Mol. weight - Temperature - Liquid in gas phase Slide 7 TYPES AND RANGES OF SJP APPLICATIONS • Revival of dead wells (oil&gas wells)/ de-liquification • Boost production from oil or gas wells • Boost pressure of LP gas in a process system • De-bottleneck compressors • Eliminate intermediate compressors • Prevent HP wells impose back pressure on LP wells • Prevent flaring LP gas • Others to meet process requirements Slide 8 WELL REVIVAL –SPILAMBERTO FIELD,ITALY Source of HP flow; HP gas well Benefits; Gain in gas production by 23,000 sm3/d (0.812MMscfd)For almost two years Slide 9 BP Inde, UKCS Solution ; Used HP recycled gas to power SJP, to draw-in low pressure satellite Shell wells Benefits  Production of 68 MMscfd of gas from LP Shell wells  Production increased by 25% Compressor Davy Line Export  Increased intake capacity of Separator compressor Jet Pump Bessemer  De- bottlenecked exiting compressor Dp Low Pressure Gas Wells  Removed liquids from LP wells and Juliet the pipeline Kilo Subsea Line Award winning solution Slide 10