Water flooding out characteristics of Anan sandstone oil reservoir at its medium later development stage.
Water flooding out characteristics of Anan sandstone oil reservoir at its medium later development stage.
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发表时间：
2000
影响因子：
7.5
通讯作者：
Yang Wen
中科院分区：
文献类型：
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作者：
Yang Wen
结合邻区开发初期油基泥浆岩心分析资料，研究了垂向水淹特征、层内水淹特征、水淹后岩石物性变化及孔隙结构变化。利用注水威尔斯井开发中后期未污染岩心分析及储层动态资料，揭示了注水开发中后期水淹问题，油藏进一步开发潜力的分布，以寻求合理的开发策略，并处理水驱后对储层的影响。结果表明，阿南低渗油藏的相对高渗部位是主力产层，也是损害和水淹的主要部位。水淹作用导致储层孔喉分化强烈，大喉变大，小喉变小。受这些孔隙控制的主驱油通道的有效孔隙体积变小，无水期变短，最终采收率降低。这是造成产水率高、产液率低、出水量上升快的主要原因，而提高总产液率又不能解决这些问题。在这种厚砂岩油藏的开发中，精细分层是提高驱油效率的有效途径，B。
Vertical and intra layer water flooding out cha racteristics, the change of petrophysical properties and the change of porous structures after flooding out are studied by a combination of data from oil base mud core analysis at ear ly development stage in a neighboring area, uncontaminated core analysis from wa ter injection wells at middle late development stage and reservoir behavior dat a to reveal the matter of water flooding out and the distribution of further po tential of production in the oil reservoir to find a reasonable development poli cy and to deal with the effects on the reservoir beds after water flooding out. Results show that relatively high permeability part of the Anan low permeabil ity oil reservoir is the main productive layer and is the mainly damaged and flo oded out one also. Results of flooding out lead the strong differentiation of pore and throats: large throats become larger; and small ones become smaller. T hus effective pore volume in the main flooding path controlled by those pores be comes lesser to give a relative short period of water free period and a lower u ltimate recovery. This is the main reason why water production is high and produ ction rate is low and the water out rises rapidly; and these cannot be correcte d by increase the total liquid production rate. Detailed layer separation will b e the effective way to increase the efficiency of oil displacement in the develo pment of such thick sandstone oil reservoirs.