摘要
针对渤海湾盆地东营凹陷低渗透砂砾岩油藏储层物性差、非均质性强、井网适应性差,有效动用程度低的问题,采用径向钻孔技术优化研究,通过分析径向钻孔的适应性,纵向上对水淹程度低、动用差的储层实施径向钻孔,平面上变方向适配井网,避免地应力方向变化导致井网不匹配,变长度适配井距,减小注采井距,避开高水淹分布区,实现各方向均衡水驱等措施,形成一套径向钻孔适配井网优化技术。指导实施径向钻孔井7口,实施后单井产能均增加2倍以上,自然递减下降3%,储量动用程度提高20%,增产效果明显。研究认为低渗透非均质注水开发中后期通过径向钻孔均衡了平面水驱,改善纵向吸水状况,达到了适配井网的目的,具有良好的工业化应用前景。
The conglomerate reservoirs in the Dongying Depression,Bohai Bay Basin have such characteristics,poor physical properties,strong heterogeneity,and poor well adaptability.The use of radial drilling optimization studies can improve the utilization rate of reserves,balanced injection patterns,and ultimately improve recovery.In the longitudinal direction,the light flooding through,the use of poor reservoir implementation radial drilling,improve reservoir heterogeneity;in the plane,one fit well network by varying the direction of change inevitably cause stress direction well network do not match.the second is a variable length adaptation by well spacing,reducing the injection well spacing,improved utilization of reserves,the third is by plane to avoid flooding,water flooding achieve balance in all directions.Currently implemented in Wing 1of low permeability sandstone and conglomerate reservoir radial boreholes 7,well productivity had increased more than 2times after the implementation,and slowing diminishing reserves utilized effectively improve yield good results,but through the radial drilling hole balanced planar water flooding,improve vertical suction conditions,to achieve the purpose of adapting well network.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2014年第S1期113-117,共5页
Natural Gas Geoscience
基金
国家重点基础研究发展计划(编号:2009CB219302)资助
关键词
低渗透砂砾岩
径向钻孔
非均质
适配井网
提高采收率
Low permeability sandstone and conglomerate
Radial drilling
Heterogeneity
Fit well network
EOR
