CHEMICAL EOR – THE PAST; DOES IT HAVE FUTURE：化學(xué)EO–過(guò)去；它有未來(lái)

1、chemical eor progress in china chemical eor progress in china advances and challengesadvances and challengesharry l. changhoutline of presentationoutline of presentation overview recent advancements chemical eor in china polymer flooding asp flooding facilities some controversial issues and challeng

2、es summarychemical eor global statuschemical eor global status china has most field experiences us 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. changharry l.

3、changgeneral understandinggeneral understanding polymer flooding (pf): a mature eor process polymer gels: used successfully in water shut-off and profile modification in selected reservoirs surfactant-polymer (sp): effective but expensive asp: effective, less expensive, but requires extensive treatm

4、ent of injection/produced fluidsharry l. changharry l. changrecent advancementsrecent advancements chemicals laboratory studies simulation and simulators project design and implementation facilities, monitoring, and evaluation more field experiencesharry l. changharry l. changeor chemicalseor chemic

5、als polymers and related chemicals surfactants co-surfactants co-solventsharry l. changharry l. changimprovements on polymersimprovements on polymers(ut david levitt dissertation)(ut david levitt dissertation)1500 ppm hpam polymer, 23 c, 11 s-101020304050050,000100,000150,000200,000electrolyte conce

6、ntration tds, ppmviscosity cpnacl9:1 nacl/cacl2harry l. changharry l. changimproved laboratory techniquesimproved laboratory techniques phase behavior/solubalization ratio high temperature and live oil core flood techniquesharry l. changharry l. changphase behavior experimentsphase behavior experime

7、nts phase behavior experimentsinexpensive technique for surfactant formulationmeasure solubalization parameters/iftsmeasure coalescence/equilibration timedetermine microemulsion viscosities specific surfactant(s) can be tailored for specific oilsharry l. changharry l. changan excellent me phase beha

8、vior an excellent me phase behavior 0.01.02.00.51.52.53.03.54.0salinity, %:0.751.251.752.252.75increasing electrolyte concentrationinterface fluidity interface fluidity high oil recovery90% sorw, or sorc 500 ppm.pv now production of polymer and emulsions may be expected large scale injection/product

9、ion facilities are necessary for successful operationsharry l. changharry l. changpolymer flooding also showedpolymer 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

10、 effective in high perm and high salinity reservoirs visco-elastic behavior can reduce sor (spe127453) cdg will enhance pf performanceharry l. changharry l. changoil production by polymer floodingdaqing oilfield, china01002003004005006007008009001000199319951997199920012003200520072009yearoil rate b

11、y polymer flooding, mmbblspf ann. rate, mmbblscum. prod., mmbblsa typical pf field performancea typical pf field performancetypical pressure and polymer productiontypical pressure and polymer productionoil production by polymer floodingshengli oilfield, china02040608010012014016018020019971999200120

12、03200520072009yearoil rate by polymer flooding, mmbblspf ann. rate, mmbblscum. prod., mmbblskypam polymerskypam polymers comb like with short branched chain to maintain effectiveness in high salinity brines wide mw range for reservoirs with different permeabilities successfully applied in some reser

13、voirs in china harry l. changharry l. changviscosity data of kypam polymerviscosity data of kypam polymerconcentratioconcentration nviscosityviscosityperformance of kypam polymersperformance of kypam polymersperformance of kypam polymersperformance of kypam polymersasp floods in chinaasp floods in c

14、hina 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 observedharry l. changharry l. changfield examplesfield examples daqing karamay asp pilot simulationharry l.

15、 changharry l. changasp pilot tests conducted in asp pilot tests conducted in daqing oilfielddaqing oilfieldharry l. changharry l. changasp results in daqingasp results in daqing high incremental recovery severe emulsion production severe scale production sp with a instead of asp? one of the most di

16、fficult oil for sp floodingharry l. changharry l. changkaramay asp pilot test design and karamay asp pilot test design and field performancefield performance (spe 64726) (spe 64726) process design/management: harry chang project implementation: karamay oilfield a single surfactant system using petro

17、leum sulfonates produced in a local refinery applied the salinity gradient with stpp for sequestration asp pilot test well pattern, asp pilot test well pattern, 2z-b9-3 well group2z-b9-3 well groupkaramay oil field (spe 64726)karamay oil field (spe 64726)asp slug design and injection sequenceasp slu

18、g design and injection sequence(spe 64726)(spe 64726)pampampampammodellingmodelling core flood - core flood - karamaykaramay asp project asp project modelling coreflood modelling coreflood (utchem)(utchem) - karamay asp - karamay asp project project modelling of pilot area performance (spe 39610 and

19、 64726)some comments on aspsome comments on asp asp requires special crude oils to improve performances asp slug cost less but other costs would be substantial (treating injection brine and produced fluids) low surfactant concentration (90oc modeling polymer visco-elastic effects low mw polymers for

20、 low perm. reservoirs surfactants with low adsorption and other additives low cost and effective emulsion breakers new scale prevention technologiesharry l. changharry l. changsummarysummary a large number and variety of high performance surfactants and polymers are now available for eor chemical flooding is now being used for highly viscous crudes, under higher salinity and highe