下二门及孙岗低渗透储层损害因素及保护措施研究  

Find measures to protect XiaErMen and Sungang low permeability reservoirs against damage.

作　　者：赵跃华[1] 张燕[1] 田宗武[1] 

机构地区：[1]河南石油勘探局勘探开发研究院,河南南阳473132

出　　处：《特种油气藏》1999年第3期49-53,共5页Special Oil & Gas Reservoirs

摘　　要：方法　在对储层基本特征和流体性质进行研究的基础上 ,分析下二门及孙岗低渗透储层的损害原因。目的　提出油层保护措施。结果　采用屏蔽暂堵技术来改造钻井液 ,以满足钻井液保护多套层系的要求 ;该区不宜采用高浓度的HF进行酸化 ,以免引起油层出砂 ;现场工作液矿化度下二门地区应控制在 2 0 0 0～ 2 5 0 0mg/L ,孙岗地区应控制在 5 0 0 0～ 5 5 0 0mg/L ;注入水 pH值应小于 8,流速应尽量使用临界下限 ( 0 1～ 0 5mL/min) ,以防止微粒运移造成地层损害。结论　油层损害受内部和外部两种因素影响 ,应根据油层岩石本身特征和所包含的流体性质 ,选择合适的钻井、采油等技术 ,以降低油层损害 ,提高开发效果。Method Based on study upon reservoir basic characteristics and fluid properties, reasons which may cause damage to low permeability formation in XiaErMen and Sungang area are analyzed. Purpose To put forward protective measures for oilbearing formation. Result Screening and plugging technique is used to improve drilling fluid so as to satisfy the needs of protecting multilayer formations with drilling fluids. Since this area is not suitable for acidzing treatment with HF of high concentration for fear that this may lead to sand producing, mineralization of site operation fluid should be controlled between 2 000～2 500 mg/L for XiaErMen area, 5 000～\{5 500\} mg/L for Sungang area. pH value of injected water should be less than 8 at applicable low rate, i. e. 0. 1～0 5 mL/min, in this way to prevent transition of minute particles which will damage formation.Conclusion Oilbearing formation damage is subjected to both internal and external factors, so it is necessary to select suitable drilling and producing techniques, if want to reduce damage and improve results, according to inherent characteristics of formation and properties of its contained fiuids.\;

关 键 词：储集层 油层损害 低渗透油藏 

分 类 号：TE258[石油与天然气工程—油气井工程] TE348