薄互层砂岩油藏多因素综合约束的产量劈分方法

Production split method restricted synthetically by multi-factors in thin interbed sandstone reservoirs

针对多层合采的薄互层砂岩油藏的产量劈分问题,采用常规产量劈分方法得到的数据结果准确性较差,为解决该难题,可采用以下措施:(1)利用产油井的各种动静态资料(包括层间非均质性、生产数据和产液剖面等)以及封层、补孔等生产作业资料来确定产量劈分计算节点;(2)根据采油井的射孔投产情况、弹性开采情况、封层补孔和产液剖面测试结果,遵循"节点之间进行线性内插,节点之外进行线性外推"的原则分别确定不同类型节点的计算方法;(3)编制产量劈分的计算程序。通过上述措施,对柴达木盆地尕斯地区200余口井进行了精确劈分,劈分结果与实际生产情况以及产液剖面测试结果较为吻合。该产量劈分方法提高了工作效率和产量数据的精度。

For the problem of production split in thin interbed sandstone reservoirs with multi-layer commingled production,the accuracy of calculation results obtained by conventional production split method is poor.In order to solve this problem,the following measures can be adopted:(1)Determining production split calculation nodes by using various dynamic and static data(including interlayer heterogeneity,production data,liquid production profile)and production data such as zonal isolation and reperforate.(2)According to perforation and putting into production,elastic production period,zonal isolation and reperforate,liquid production profile test,to determine calculation methods of different types of nodal points separately,obeying the rule of“linearity interpolation between nodal points,and linearity extrapolation outside last nodal point”.(3)The calculation procedure of produc-tion split was established.Using the above measurements,the produced oil and water quantity were split accurately for more than 200 wells in Gasi area in Qaidam Basin.The results of production split coincide well with actual production situation and liquid production profile test data.This method improves the accuracy of production split results and enhances work efficiency.