人工裂缝方位偏转对整体压裂效果影响研究

STUDY ON THE INFLUENCE OF ARTIFICIAL FRACTURE ORIENTATION DEFLECTION ON INTEGRAL FRACTURING EFFECT

受储层非均质性等因素的影响,人工裂缝方向可能偏离井网方向,影响整体压裂效果。为此以白豹油田长6储层菱形反九点注采井网为例,建立了整体压裂和人工裂缝方位偏转时的压裂数值模拟模型,进行了整体压裂裂缝参数优化,研究了人工裂缝方位偏转对生产动态的影响程度。结果表明,人工裂缝方位偏转后采出程度大幅降低,特别是最有可能的裂缝小角度偏转采出程度降低最多,经分析建议裂缝方位发生偏转时应进行局部注采井网调整或减小裂缝缝长。

Affected by the reservoir heterogeneity and other factors,artificial fracture orientation may deviate from the direction of well patterns,which are placed along favorable orientation,and the integral fracturing effect will be affected. So,taking rhomboid anti- nine spot pattern in Chang 6 reservoir of Baibao oilfield as an example,a numerical simulation model of integral fracturing with deflected fracture was established,the integral fracturing parameters were optimized and the influence of different fracture parameters on production performance was studied. Results showed that when the fracture orientation deflected,the recovery degree was reduced greatly,especially,when the fracture orientation deflects with a slight angle,the recovery degree was reduced to a great extent. In this case,adjusting local well pattern or reducing the fracture length was suggested.