注水井疏水降压增注液体系的研究与应用

发布时间：2018-04-23 03:06

本文选题：疏水降压增注 + 低伤害酸液　；参考：《石油与天然气化工》2017年05期

【摘要】：为解决长庆油田Y19区块注水井普遍存在的长期高压欠注和措施有效期短的问题,通过开展岩石矿物成分、储层敏感性、地层流体与注入水的配伍性等分析实验,找出了引起注水井高压欠注的主要因素,分别是储层敏感性、注入水引起的润湿反转及化学结垢堵塞。对此,室内研发出一套由低伤害酸液、硫酸盐垢解除剂、纳米疏水材料段塞组成的疏水降压增注液体系。该体系能够有效解除化学结垢堵塞,改善岩石表面润湿性,降低水驱毛管阻力,从根本上解决了引起注水井高压欠注的主要矛盾。已完成的2口现场试验井均达到配注要求,且注入压力下降均超过2 MPa,累计增注8 077m~3,较常规措施有效期延长4个月以上,取得了较好的应用效果,同时也为低渗透油田降压增注作业提供了一种有效的技术手段。
[Abstract]:In order to solve the problem of long term high pressure underinjection and short period of validity of measures in water injection wells in block Y19 of Changqing Oilfield, through the analysis experiments of rock mineral composition, reservoir sensitivity, compatibility of formation fluid and injected water, etc. The main factors causing high pressure underinjection in water injection wells are reservoir sensitivity, wetting inversion caused by injection water and chemical scaling and plugging. In this paper, a hydrophobic depressurization and injection system composed of low damage acid, sulfate scale relieving agent and nano-hydrophobic material slug was developed. The system can effectively remove chemical scaling and blockage, improve the wettability of rock surface, reduce the resistance of water flooding capillary, and fundamentally solve the main contradiction that causes the high pressure and underinjection of water injection wells. The two field test wells that have been completed have met the requirements of injection allocation, and the injection pressure has decreased by more than 2 MPa, and the cumulative injection has been increased by 8 077 mm3, which is more than 4 months longer than that of the conventional measures. At the same time, it also provides an effective technique for reducing pressure and increasing injection in low permeability oilfield.
【作者单位】：中国石油川庆钻探工程有限公司钻采工程技术研究院;低渗透油气田勘探开发国家工程实验室;
【基金】：基金项目:中国石油集团川庆钻探公司“长庆低渗透油田注水井用纳米疏水降压材料开发及应用”(CQ2016B-23-1-4)
【分类号】：TE357.6

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