水驱油田不同含水时期合理注水量计算方法

Reasonable water injection rate calculation for water flooding reservoirs at different water cut stages.

水驱油田进入全面注水开发后，处理好注水问题是原油生产的基础与保障。目前确定水驱油田注水量的普遍方法是依据先定的注采比和产液量目标来计算，受人为因素影响大。以Ｌｏｇｉｓｔｉｃ旋回为基础，建立了油田或区块的综合含水与累积耗水量、综合含水与累积水油比的数学关系，能够求出不同含水时期一定产油量指标所需合理注水量的定量关系式。经实际检验，用此方法计算、规划水驱油田的合理注水量是可行的，还可用此方法规划油田或区块的合理注采比。但是在油田或区块开发未进入全面注水阶段及做重大调整后，不能采用此方法。

After water flooding oil field is put into full operation, water injection becomes the basis and guarantee of oil production. The common way to calculate the water injection volume, at present, is based on the pre determined injection production ratio and the liquid yield, which is strongly affected by people and short of scientific foundation. This paper gives out a calculation method for determining the reasonable water injection volume for reservoirs at different water cut stages, which is based on the theoretical analysis of oil field development and provides the relation of gross water cut vs. cumulative water injection and that of gross water cut vs.cumulative water oil ratio according to Logistic cycle. For this, we can get the quantitative formula for the calculating reasonable water injection volume under a given production index. The result of its application to planning the reasonable injection production ratio for fields or blocks proves its effectiveness. But this method can not be used before the field (or block) development entering into full water injection phase and after significant adjustment is adopted to the field.