Research On Development Technology Of Low-Permeability Reservoirs In Wangguang And Huangchang Oilfield

As the developing of the oilfield exploitation, low permeability oil-gas reservoirs start to take large and large proportions in the oilfield exploitation. Low permeability reservoirs are characterized by poor reservoir qualities, low per-well productions, high exploitation difficulty, high costs and difficulty with stabilizing production. Judging by the characters of reservoir exploitation, the reservoir features are as follows: productive capacity of well production is low, formation pressure depletes dramatically, primary recovery efficiency is low; the absorption capacity of injection well is not good and it's hard to supply the energy for the formation by water-flooding. What's more, the well provided an ineffective result of the well production declines rather than goes up after water injection. Meanwhile, they're in a dilemma, for oil well has the problem of rising water cut after affusion, however, the formation of well that has stopped flooding doesn't have enough energy. Studies of low-permeability oil-gas reservoirs are far behind that of medium-high permeability reservoirs at home and abroad. Wangguang and Huangchang, which has been started and perfected, is the main productive zones for Jianghan oilfield in recent years. Its reservoirs are more stronger heterogeneous low permeability oil-gas reservoirs, It's difficult to artificial water for exploitation. Especially from recent years, because of the rising water cut and insufficiency of formation energy, for the auld well of well-area, the extent of natural decline is bigger and it's difficult to stabilize the production. The general exploration situation for Wangguang block is like this: oil production decreasing, overall water containment rising up, producing fluid level subsiding. Compared to Wangguang, the situation in Huangchang block is better . Oil production goes up, overall water cut recedes, producting fluid level rises up, but in reference to some specific exploitation units and well groups, the significant prospecting problems emerge. Therefore, how to stabilize the production in these two blocks and enhance oil recovery are the main terms in our researches. This paper is based on the above background.The paper is divided into 5 chapters. In the first chapter, it discusses advancing situations for...