注水井疏水降压增注液体系的研究与应用.pdf

油与天然气化
78
CHEMICAL, ENGIN OIL& GAS
注水井疏水降压增注液体系的研究与应用
樊庆缘“蒋文学“武龙
1.中国石油川庆钻探工程有限公司钻采工程技术研究院2.低渗透油气田勘探开发国家工程实验室
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、納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ロ现场试验井均达到配注要求,且注入压力下降均超过2MPa,累计增注8077m2,较常规
措施有效期廷长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増注作业提供了一种有
效的技术手段。
关键词疏水降压增注低伤害酸液硫酸盐垢解除剂纳米疏水材料高压欠注井
中图分类号:TE39文献标志码:ADO1:10.3969/isn.1007-3426.2017.05.016
Research and application of hydrophobic reducing pressure and
increasing injection liquid system of injection well
Fan Qingyuan ", Jiang Wenxue", Wu Long
CCDC Drilling Production Technology Research Institute, Xi'an, Shaanxi, China
2. National Engineering Laboratory oflou-permeability Oil Gus Fields Ea p loration and
Develop ment, Xi'an, Shaanxi, China
Abstract: In order to solve the problems of insufficient water of injection wells with long-term high
pressure and short validity period in Changqing Oilfield Y 19 block. the lab analysis tests of rock
mineral composition, reservoir sensitivity, compatibility of formation fluid and water injection were
carried out. The main factors causing insufficient water of injection wells with high pressure were
found, these were wettability reversal, fouling blocking and sensitivity of reservoir. In this regard, a
set of hydrophobic antihy pertensive liquid system consisting of low harm acid liquid, sulfate scale
release agent, hydrophobic nanomaterial slug was developed in laboratory. The liquid system could
effectively remove chemical fouling blocking, improve the wettability of rock surface and reduce water
flooding capillary resistance. Thus the main contradiction caused by insufficient water injection under
high pressure of injection wells was fundamentally solved. Two wells completed field test both reach
the injection distribution requirements, the injection pressure drop was over 2 Mpa, the total
increasing injection amount was 8 077 m, and the period of validity extended more than 4
In on
th
compared with conventional measure. The application has achieved a good effect, and provided
effective technical means for reducing pressure and inereasing injection operation of low permeability
oilfield
Key words: hydrophobic reducing-pressure and increasing-injection liquid system, low harm acid
liquid, sulfate scale release agent, hydrophobic nanometer material, insufficient water injection wells
In I
oressure
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
作者简介:樊床線(1984-),工程师,2010年毕业于中国石油大学(北京)行油与天然气工程学院,研究生学ガ(工学硕士),现
就职丁中国右
钻探工程有限公司钴采工程技术研究院?从事压裂酸化技术研究工作。F-mail:fqy_gcmacnpc.com.cn