API Gas Lift Design PDF
Preview API Gas Lift Design
API Gas Lift Design • API RP 11V6: Recommended Practice for Design of Continuous Flow Gas Lift Installations ---- Using Injection Pressure Operated Valves • By Sid Smith 2007 Workshop Clegg & Smith 1 INTRODUCTIONS PLEASE TELL US THE FOLLOWING INFORMATION ABOUT YOURSELF: Name Work Location Job (role) Number of Years Experience Gas Lift Background - hands on - previous training 2007 Workshop Clegg & Smith 2 Design Outline • Introduction (20) • Design Methods: • General Design (20) .Constant Rate (30) .Variable Rate (30) • Inflow & Outflow & .Intermittent (15) …….Tubing (45) .Equilibrium Curve (45) • Facilities (15) • API Example # 1 (45) • Gas Inj. Pressure (15) • Mandrels & Valves (30) • API Example # 2 (45) • Temperature (15) • Gas Passage (15) • API Example # 3 (45) • Summary (15) 2007 Workshop Clegg & Smith 3 0. Introduction :API RP 11L6 • RP to provide guidelines, procedures and recommendations. See other API RP’s. (Also ISO documents) • 1 Scope: Guidelines for continuous flow using injection pressure valves • 2 Intent: Maximize production and . Minimize costs • 3 Definitions • 4 General Design Considerations 2007 Workshop Clegg & Smith 4 S.V. Continuous Intermittent 2007 Workshop Clegg & Smith 5 Typical continuous flow gas lift installation Injection gas into wing valve and then down the casing-tubing annulus. Well equipped with tubing, side pocket mandrels, wireline retrievable gas lift valves and a single production packer located just above the producing zone. Note: Upper gas lift valves closed and gas enters gas lift valve near bottom. 2007 Workshop Clegg & Smith 6 4.1 General • Complete system! • Combination of concepts and experience • Continuous flow gas lift has advantages and limitations. 2007 Workshop Clegg & Smith 7 Continuous GL Strengths • Flexible lift capacity • Low surface profile • Handles sand OK • Compatible /SSSV’s • Deviated holes OK • Permits sounding • Permits wire line op • Easy BHP surveys • Tubing fully open • Permits PL surveys • High GLR beneficial • Dual lift feasible • Low well R&M • Tolerates bad design 2007 Workshop Clegg & Smith 8 Continuous GL Weakness • High back pressure imposed • Needs uninterrupted high pressure gas • Compressor expenses often high • Heading problem with low rates • Potential gas freezing & hydrate problem • Increased friction w/low gravity crude • Valve interference & high inj. point • Corrosion, Scale, & paraffin • Efficient dual lift difficult • Requires excellent data for good design 2007 Workshop Clegg & Smith 9 GL Design Guidelines • Inject gas as deep as feasible • Conserve injection pressure • Ensure upper valves stay closed • Be able to work down to bottom • Check for ample gas passage • Plan for changes in rate • Avoid heading conditions • Minimize costs & Maximize rates 2007 Workshop Clegg & Smith 10
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