冲击波解堵工艺及其应用

Technology and application of shock wave plugging removal

近井径向 3～ 5m内的渗流特征是确定油井自然产能的主要因素 ,因此 ,改造近井带的导流能力 ,对提高产能将起到重要作用。应用冲击波解堵 ,可形成具有一定宽度且不闭合的裂缝体系 ,且裂缝不受地应力的控制 ,能“全方位”改造近井带地层 ;其裂缝的长度虽不如水力压裂 ,但却完全突破了近井带的“颈缩”地区 ,具有明显的增产效果 ,并且对低渗透层与污染井的解堵效果尤为突出。该工艺应用于胜利油区部分油田 ,已取得了显著的增产增注效果。研究认为 ,该工艺是开发中后期油藏 ,尤其是低渗透油藏经济而有效的措施。

Seepage features in radial 3～5m near well bore are the main factors of determining natural productivity of oil wells. It is important for productivity raising to improve the flow conductivity of immediate vicinity of wellbore. Using shock wave plugging removal can form unclosed fracture system with certain width, which is not controlled by earth stress and can reform the near wellbore formation in all directions. Compared with hydraulic fracturing, its length of the fractures is short, but it can be used in the 'bottle neck' area of the immediate vicinity of wellbore. Its stimulation result is obvious particular to plugging removal in low permeability formations and polluted wells. This technology has been successfully applied in some oilfields of Shengli petroliferous province. The research shows that it is an economic and effective measure for the development of middlelater period oil reservoirs particular to low permeability oil reservoir.