CHEMICAL EOR – THE PAST; DOES IT HAVE FUTURE:化学EOR–过去;它有未来.ppt
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1、Chemical EOR Progress in China Advances and Challenges,Harry L. Chang H ,Outline of Presentation,Overview Recent advancements Chemical EOR in China Polymer flooding ASP flooding Facilities Some controversial issues and challenges Summary,Chemical EOR Global Status,China has most field experiences US
2、 has focused on improvements in chemicals, lab studies, and simulators Increased chemical EOR mechanistic understandings and field activities in US and world-wide in recent years,Harry L. Chang,General Understanding,Polymer flooding (PF): A mature EOR process Polymer gels: Used successfully in water
3、 shut-off and profile modification in selected reservoirs Surfactant-polymer (SP): Effective but expensive ASP: Effective, less expensive, but requires extensive treatment of injection/produced fluids,Harry L. Chang,Recent Advancements,Chemicals Laboratory Studies Simulation and Simulators Project D
4、esign and Implementation Facilities, Monitoring, and Evaluation More Field Experiences,Harry L. Chang,EOR Chemicals,Polymers and related chemicals Surfactants Co-surfactants Co-solvents,Harry L. Chang,Improvements on Polymers (UT David Levitt Dissertation),Harry L. Chang,Improved Laboratory Techniqu
5、es,Phase behavior/solubalization ratio High temperature and live oil Core flood techniques,Harry L. Chang,Phase Behavior Experiments,Phase behavior experiments Inexpensive technique for surfactant formulation Measure solubalization parameters/IFTs Measure coalescence/equilibration time Determine mic
6、roemulsion viscosities Specific surfactant(s) can be tailored for specific oils,Harry L. Chang,An Excellent ME Phase Behavior,Interface Fluidity,High oil recovery 90% Sorw, or Sorc0.04 Adequate mobility control Good surfactant/polymer transport Low surfactant retention,Core Flooding,Harry L. Chang,S
7、imulation and Simulators,Mechanistic model for core flood and pattern simulation Calibration and field scale simulation Advanced simulators,Harry L. Chang,Chemical EOR in China,Daqing Oilfield,Largest polymer and ASP floods in the world PF oil production in Daqing has been stabilized at 200,000 bbl/
8、d over 10 years Polymer requirement has doubled in last 10 years from 80,000 t/yr to 160,000 t/yr Large-scale ASP floods have been implemented since 2006,Harry L. Chang,Shengli Oilfield,Second largest PF in China Also has polymer manufacturing facilities Several ASP pilot tests have been conducted i
9、n the past but decided to use SP instead,Harry L. Chang,PF in China Showed,Incremental recovery depends on reservoir quality polymer selection polymer amount, 500 ppm.pv now Production of polymer and emulsions may be expected Large scale injection/production facilities are necessary for successful o
10、perations,Harry L. Chang,Polymer Flooding also Showed,Simplified field operations have been practiced in field-wide operations On-site polymer production would improve the economics KYPAM polymers appears to be more effective in high perm and high salinity reservoirs Visco-elastic behavior can reduc
11、e Sor (SPE127453) CDG will enhance PF performance,Harry L. Chang,Oil Production by Polymer Flooding Daqing Oilfield, China,A Typical PF Field Performance,Typical Pressure and Polymer Production,Oil Production by Polymer Flooding Shengli Oilfield, China,KYPAM Polymers,Comb like with short branched ch
12、ain to maintain effectiveness in high salinity brines Wide MW range for reservoirs with different permeabilities Successfully applied in some reservoirs in China,Harry L. Chang,Viscosity Data of KYPAM Polymer,Concentration,viscosity,Performance of KYPAM Polymers,Performance of KYPAM Polymers,ASP Flo
13、ods in China,Pilot testing: Daqing, Shengli, Karamay Large scale field projects in Daqing Large scale injection/production facilities have been developed in Daqing Emulsion and scale productions were observed,Harry L. Chang,Field Examples,Daqing Karamay ASP pilot simulation,Harry L. Chang,ASP Pilot
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