红河油田长8油藏压裂水平井生产规律研究

Production law evaluation of fractured horizontal wells of chang 8 section in Honghe oil reservoir

红河油田位于鄂尔多斯盆地天环向斜南部,红河油田长8油藏属于低孔、特超渗储层,局部裂缝发育,基本无自然产能,需压裂投产。压裂投产后,按产量分类,第一类水平井产量高、含水低是高效生产模式,第三类水平井产量低、含水高是低效生产模式。3类水平井均符合双曲递减规律。通过地质、试油试采资料与地震相结合,第一类水平井主要位于河道主体部位且地震位于Ⅱ级、Ⅲ级及其附近断裂带;第二类水平井位于河道砂体相对较薄部位且地震位于Ⅰ类、Ⅱ级断裂区;第三类水平井位于裂缝不发育的基质区。

Honghe oil reservoir is located the south of Tian huan syncline in Ordos Basin. Chang 8 sec- tion of Honghe oil reservoir is low pore , ultra--low permeability and develops fracture in some area. It has no natural output and must be fractured. The wells are assorted to three kinds according to its output. The first kind of horizontal wells are high productivity model with high output and low water cut. The third kind of horizontal wells are low productivity model with low output and high water cut. All of the three kinds of horizontal wells fit hyperholical decreasing law. By considering the information of geology, well test and seism together, we can find that the first kind of horizontal wells are located the main part of the river and near the fracture section of Ⅱ or Ⅲ rank in seism. The second kind of horizontal wells are lo- cated the thinner part of the river and near the fracture section of I or Ⅱ rank in seism. The third kind of horizontal wells are located the matrix in seism without any fracture.