闫伟 张治东 惠瑞瑞 孟东飞 张献平

摘 要：长庆油田鄂尔多斯盆地储层非均质性较强，不同储层渗透率差异明显。长期注水开发后，注水剖面严重不均匀。当井况恶化时，分层酸化受到限制。一般酸化过程中酸液容易进入高渗透储层。中、低渗透储层损害无法有效消除。相反，差异被放大了。通过室内试验，筛选出适合注水井酸化的暂堵剂和纤维。通过模拟试验，优化了暂堵酸化工艺参数。更有利于消除中低渗透伤害，改善吸水剖面，提高酸利用率。为非均质严重致密油藏低渗透层精细分层注水提供了新思路。现场试验1井次，技术成功率100%。

关键词：吸水剖面;暂堵酸化;一般酸化;储层损害

中图分类号：TE357.2 文献标识码：A 文章编号：1001-5922（2021）04-0043-04

Abstract：The reservoirs in Ordos Basin of Changqing Oilfield have stronger heterogeneity and the permeability of different reservoirs is obviously different. After long-term water injection development， water injection profile is seriously uneven. When the condition of the well is deteriorated， separate zone acidizing is limited. In general acidification the acid is easy to enter the high permeability reservoir. Medium and low permeability reservoir damage cannot be effectively eliminated. Instead， the differences are magnified. The temporary plugging agent and fibre for water injection well acidification were selected through laboratory experiments. The temporary plugging acidification process parameters were optimized by the simulation experiment. It is more conducive to removing the middle， low permeability damage and improve the water absorption profile and improve acid utilization rate. A new idea is provided for the fine stratified water injection of low permeability layer in the heterogeneous serious tight reservoir. Field experiment is 1 well times with technological successfulness of 100%.

Key words：water absorption profile; temporary plugging acidification; general acidification;  reservoir damage

0 引言

堵水酸化聯合技术是改善开采中后期地层非均质性的有效措施。该技术是20世纪90年代提出的，从那时起在堵剂体系和施工方法上都有了新的进展。酸化选择性堵漏技术是目前已取得的进展。但随着现场应用的增加，也出现了一些问题，如堵剂体系的耐酸性差，封堵强度和有效期不足，低渗透层易受混注损害等。因此，建议采用组合式堵漏系统。多级注水是解决裂缝性水渠的一种措施，油溶性分流器对堵水系统起着保障作用。在提高地层均质性的条件下，可以进行连续酸化，使含水下降，油量增加。

在常规酸化工程中注入暂堵剂。通过其自然选择，暂堵剂首先进入吸水能力强的地层。临时堵塞剂在沸腾的喉部形成桥接颗粒。……