Hot Working Technology SHMP is a production center of heavy duty castings and forgings in east region of China. Since the establishment of the plant in 1950s, through several generations’ exploration, development and...Hot Working Technology SHMP is a production center of heavy duty castings and forgings in east region of China. Since the establishment of the plant in 1950s, through several generations’ exploration, development and innovation, SHMP now has been able to produce main castings and forgings for 300 MW展开更多
Waterflood-assisted oil recovery with sulfate-spiked seawater would cause incompatibility scaling in carbonate reservoirs and reduce economic benefits.This research investigated the benefits of polyphosphate compounds...Waterflood-assisted oil recovery with sulfate-spiked seawater would cause incompatibility scaling in carbonate reservoirs and reduce economic benefits.This research investigated the benefits of polyphosphate compounds in reducing scaling potential as well as its effect on oil recovery when mixed in high sulfate flood water.Severity of scaling potential of sulfate-spiked water in a carbonate reservoir environment was measured,followed by systematic screening of a polyphosphate compound,which successfully inhibited the sulfate scale precipitation at concentration as low as 100 ppm.The new formulation(seawater with four times sulfate and phosphate,SW4 SP)was evaluated and compared with benchmark formulation(modified seawater with four times sulfate,SW4 S).Contact angle,ζ-potential and drainage studies show that SW4 SP changed the rock wettability from oil wet to water wet to a larger degree compared to SW4 S.Improved recovery efficiency of SW4 SP was confirmed through a set of core flooding studies in the tertiary and quaternary flood modes.Whereas SW4 S recovered 7.7%of original oil in place(OOIP),SW4 SP recovered about 8%of OOIP in the tertiary mode under approximately identical flow conditions.Flooding with SW4 SP in the quaternary mode following a tertiary flood with SW4 S on the same core resulted in 1.7%additional oil recovery,showing improved efficiency of the new flood water formulation.展开更多
文摘Hot Working Technology SHMP is a production center of heavy duty castings and forgings in east region of China. Since the establishment of the plant in 1950s, through several generations’ exploration, development and innovation, SHMP now has been able to produce main castings and forgings for 300 MW
文摘Waterflood-assisted oil recovery with sulfate-spiked seawater would cause incompatibility scaling in carbonate reservoirs and reduce economic benefits.This research investigated the benefits of polyphosphate compounds in reducing scaling potential as well as its effect on oil recovery when mixed in high sulfate flood water.Severity of scaling potential of sulfate-spiked water in a carbonate reservoir environment was measured,followed by systematic screening of a polyphosphate compound,which successfully inhibited the sulfate scale precipitation at concentration as low as 100 ppm.The new formulation(seawater with four times sulfate and phosphate,SW4 SP)was evaluated and compared with benchmark formulation(modified seawater with four times sulfate,SW4 S).Contact angle,ζ-potential and drainage studies show that SW4 SP changed the rock wettability from oil wet to water wet to a larger degree compared to SW4 S.Improved recovery efficiency of SW4 SP was confirmed through a set of core flooding studies in the tertiary and quaternary flood modes.Whereas SW4 S recovered 7.7%of original oil in place(OOIP),SW4 SP recovered about 8%of OOIP in the tertiary mode under approximately identical flow conditions.Flooding with SW4 SP in the quaternary mode following a tertiary flood with SW4 S on the same core resulted in 1.7%additional oil recovery,showing improved efficiency of the new flood water formulation.
