致密油藏水平井产量预测及低产原因分析

Production prediction of horizontal wells in tight reservoirs and analysis of reasons for low production

水平井虽然已经成为致密油藏开发的一种有效增产手段,但是投产后产量差异大,并有部分水平井产量较低。以延长油田南部S区块为例,采用灰色关联度分析法,对影响水平井产量的地质参数和工程参数进行优选,结果表明,录井全烃包络面面积和入地液量与水平井产量关联性最好,通过进一步拟合回归,建立了致密油藏水平井产量预测模型。而储层含油性差、油层钻遇率低和压裂规模较小是水平井低产的主要原因,强化地质特征研究、提高地质导向精度并加大储层改造规模是水平井高产的关键。

Although horizontal wells have become an effective means of increasing production in tight reservoir development,there are large differences in production after they are put into production,and some horizontal wells show low production characteristics.Taking S block in the south of Yanchang oilfield as an example,this paper uses the gray correlation analysis method to optimize the geological parameters and engineering parameters that affect the production of horizontal wells,the results show that the correlation between the total hydrocarbon envelope area of logging and the total liquid volume into the ground is the best.Through further fitting and regression,a prediction model for the production of horizontal wells in tight reservoirs is established.The poor oil content of reservoir,low oil layer drilling rate an small fracturing scale are the main reasons for the low production of horizontal wells.Strengthening the study of geological characteristics,improving the precision of geological guidance and increasing the scale of reservoir reconstruction are the key to the high production of horizontal wells.