多层复杂断块油藏开发策略研究

开采低渗复杂断块油藏时,为了获得最大的开发效益,需要设计最优的开发策略与方案。对于多层复杂断块油藏,划分和组合开发层系总的原则是一套开发层系内小层数不能太多,层间差异不能太大,并且开发层系具有一定的物质基础,达到一定的生产能力。在细分调整时,一套开发层内主力小层数一般不超过3个,小层总数约为5～8层。注采井距过大,砂体储量控制程度低,注采连通率低;注采井距过小,水淹早。因此,需要对井距进行优化设计。针对多层复杂断块油藏的地质特点,井网形式以三角形井网为好,采用分套逐段上返开发方式效果较好。

Development strategy of complicated fault block reservoir with multiple layers

When developing the complicated fault block reservoirs with low permeability,the optimal development strategy and program are needed to design in order to gain the best benefits.For the complicated fault block reservoir with multiple layers,the principle to divide and combine the layer series of development is that too much single layers can not be in one layer series of development,the interlayer difference is not too large and there are enough material basis for improving the production capacity.As the adjustment and subdivision of layer series of development,the main single layers in one layer series of development can not exceed three layers and the total single layers are five to eight layers or so.If well spacing is too small,the control degree of reserves and the connectivity of sand body are all low.If well spacing is too large,water breakthrough is quick.So the well spacing should be optimized.Aimed at the geological features of complicated fault block reservoir with multiple layers,it is better that the triangular pattern is selected and the upward development in groups is adopted.