Using cyclic alternating water injection to enhance oil recovery for carbonate reservoirs developed by linear horizontal well pattern

LI Yong,ZHAO Limin,WANG Shu,SUN Liang,ZHANG Wenqi,YANG Yang,HU Dandan,CHEN Yihang

Table 2 Adjustment and optimization of injection-production parameters of different alternating well patterns.

Block Alternating well patterns Injection- production well Daily injection and production rate in the first half cycle (30 days) Daily injection and production rate in the second half cycle (30 days) Odd-numbered columns Even-numbered columns Odd-numbered columns Even-numbered columns Block M1 Inverted seven-spot alternating water injection Production well Increase to 1.2-1.4 times liquid production rate Decrease to 0.6-0.8 times liquid production rate Decrease to 0.6-0.8 times liquid production rate Increase to 1.2-1.4 times liquid production rate Injection well Shut down Increase to 2 times water injection rate Increase to 2 times water injection rate Shut down Block M2 Five-spot alternating water injection Production well Increase to 1.0-1.5 times liquid production rate Shut down Shut down Increase to 1.0-1.5 times liquid production rate Injection well Shut down Increase to 1.0-1.5 times water injection rate Increase to 1.0-1.5 times water injection rate Shut down Block M3 Periodic differential alternating water injection Production well Increase to 1.2 times liquid production rate Decrease to 0.8 times liquid production rate Decrease to 0.8 times liquid production rate Increase to 1.2 times liquid production rate Injection well Decrease to 0.5 times water injection rate Increase to 1.5 times water injection rate Increase to 1.5 times water injection rate Decrease to 0.5 times water injection rate