致密砂岩储层水相圈闭损害及防治方法探索

发布时间：2018-01-05 12:36

本文关键词：致密砂岩储层水相圈闭损害及防治方法探索　出处：《油田化学》2017年02期 　论文类型：期刊论文

【摘要】：致密砂岩气藏孔喉细微、毛管压力高、局部超低含水饱和度,极易发生水相圈闭损害,降低气井产能。利用相圈闭系数法评价了鄂尔多斯盆地M气田上石盒子组水相圈闭损害程度,通过展开毛管自吸、液相滞留评价实验分析了损害发生的原因,利用界面润湿性修饰处理剂FW-134开展了损害预防及解除研究。结果表明,上石盒子组储层潜在强水相圈闭损害;物性相对较好的盒2+3段储层水相自吸能力较盒1段强,液相平均返排率10%数47%,滤液返排率22.4%数32.3%,物性好的储层返排率相对较高;润湿性修饰为气润湿能有效抑制液相自吸,液相返排率由56.3%提高到了83.4%,使气测渗透率恢复程度由66.1%提高至88.2%。利用界面修饰处理剂使岩石润湿性由水湿变为气润湿,是有效预防和缓解致密气藏水相圈闭损害发生的重要途径,对恢复气井产能具有重要意义。
[Abstract]:Tight sandstone gas reservoir fine pore throat, high capillary pressure, local ultra-low water saturation, prone to waterphasetrapping, reduce the deliverability. Using the phase coefficient method to the evaluation of the Ordos trap basin M gas field of Shihezi Formation of waterphasetrapping degree through imbibition, liquid retention evaluation of the experimental analysis of the cause of the damage the modification agent FW-134 to carry out prevention and relief of damage by interfacial wettability. The results show that the upper Shihezi Formation reservoir water phase trapping damage; the good physical properties of the box 2+3 reservoir water imbibition capacity is 1 boxes, the average liquid flowback rate of 10% number 47%, filtrate return the rate of 22.4% row number 32.3%, a reservoir of good flowback rate is relatively high; wettability modification for gas wetting can effectively inhibit liquid self absorption, liquid flowback rate increased from 56.3% to 83.4%, the gas permeability recovery from 66.1% Up to 88.2%., using interface modifier to make the wettability of the rock change from water wet to gas wetting is an important way to prevent and alleviate the occurrence of water trap damage in tight gas reservoirs, and is of great significance for the recovery of gas well deliverability.

【作者单位】：陇东学院能源工程学院;油气藏地质及开发工程国家重点实验室(西南石油大学);
【基金】：甘肃省科技计划“陇东地区致密砂岩油藏渗流行为及注水特性研究”(项目编号1606RJYM259);甘肃省科技计划“基于SC变换曲流河致密砂岩油藏模拟方法研究”(项目编号1606RJZM092) 甘肃省高等学校项目“陇东厚黄土层下深井开采热害特性分析及研究”(项目编号2014B-092) 陇东学院2016年博士基金“超低渗透砂岩油藏能量补充方式研究”(项目编号XYBE1601)
【分类号】：TE258
【正文快照】： 水相圈闭损害是指由近井筒或裂缝面附近含水饱和度变化导致相渗透率下降的现象[1-3],毛管力作用下的自吸和液相滞留是水相圈闭发生的主要原因,尤其存在超低含水饱和度的致密气藏,流体被捕集在细小喉道中,会造成储集层永久性液相滞留,使气藏损害愈加严重[4],近井带使用水基流体

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