Bohai's largest production in the Qianshan fracture reservoir produced more than 60 million barrels of crude oil

Recently, CNOOC Tianjin Branch announced that Asia's largest conjoined platform Jinzhou 25-1 South Platform has been safe for 13 years, and it is located in the Bohai Sea, the largest reservoir in the production of Qianshan Rift, which has now contributed more than 60 million barrels
of crude oil.

Jinzhou 25-1 Nanqianshan Reservoir is the first medium and deep large-scale fractured reservoir in Bohai Sea to be developed, with reservoir fracture development, strong heterogeneity, oil storage space and fluid flow law and conventional sandstone reservoir are quite different, to achieve the efficient development of this type of reservoir is a worldwide problem, and there is no mature experience at home and abroad to learn from
.

In recent years, Jinzhou 25-1 South Oilfield has entered the middle and late stages of development, production has declined, water content breakthroughs, scientific researchers have continued to tackle key problems, innovated water injection ideas, proposed a water control strategy combining fine reservoir model research and unstable water injection technology, and formulated the first precise unstable water injection technology system of division, sub-zone and well division in Bohai, realizing the contrarian upward trend of oilfield production
.
Up to now, the Jinzhou 25-1 Nanqianshan Reservoir has been stable production for five consecutive years, breaking the fatalism of "seeing water quickly, seeing water death" in fractured reservoirs, and providing reference
for the subsequent high-quality development of similar oilfields.

In the next step, relevant researchers will continue to carry out technical research on enhanced oil recovery of special types of reservoirs, actively explore the exploration and development direction of Qianshan reservoirs, and continue to contribute to ensuring national energy security
.