渤海西部海域某区块油田注水过程储层伤害机理

中国石油勘探 ›› 2016, Vol. 21 ›› Issue (4): 121-126.

• 工程技术 • 上一篇

渤海西部海域某区块油田注水过程储层伤害机理

张旭东,陈科,何伟,张铜耀,陈毅雯

中海油能源发展工程技术分公司中海油实验中心渤海实验中心

出版日期:2016-07-15 发布日期:2016-07-15
基金资助:
国家科技重大专项“海上油田丛式井网整体加密及综合调整油藏工程技术示范”（2011ZX05057-001）。

Reservoir damage mechanism during water flooding of oilfield in a block, western Bohai Sea

Zhang Xudong, Chen Ke, He Wei, Zhang Tongyao, Chen Yiwen

CNOOC Experimental Center – Bohai Division, CNOOC EnerTech-Drilling & Production Co.

Online:2016-07-15 Published:2016-07-15

摘要/Abstract

摘要： 基于海上油田高效开发的理念，如何在注水开发过程中降低储层伤害成为高效开发海上油田的关键。针对渤海油田某区块注水过程中注入压力偏高、地层欠注等问题，进行了储层敏感性分析，以及悬浮物、垢样的扫描电镜分析等。实验发现：储层具有中等偏强的水敏伤害，黏土矿物蒙皂石以及伊/蒙间层不同程度地发生膨胀、分散，造成储层堵塞。注入水中的悬浮物含量高达16.7mg/L，严重超出平台标准要求；注入水中的颗粒粒径大约集中在30μm，容易造成储层堵塞。储层经过注水冲刷，孔喉中零星分布着大量的碳酸盐颗粒，使得储层渗透率降低。在明确了注水开发过程中储层伤害机理的基础上，提出了优化加药方式、酸化等保护措施。施工后注水井井口注入压力下降了7MPa，日注水量增加了6倍，酸化解堵效果明显。

关键词: 渤海西部海域, 注水, 伤害机理, 酸化

Abstract: Mitigation of reservoir damage during water flooding is critical for efficient development of offshore oil fields. In this paper, analysis of reservoir sensitivity and SEM analysis of suspended solids and scale samples were conducted for the water flooding process in a block, the Bohai Oilfield, during which some problems like higher injection pressure and insufficient injection exist. The experiment results indicate that the reservoir is susceptible to moderate-stronger water-sensitive damage, or plugging due to swelling and dispersion of smectite and illite/montmorillonite interlayer to various degrees. The content of suspended solids in injected water is up to 16.7 mg/L, which is much higher than the standard requirement. The size of particles in injected water are chiefly about 30 μm, which may easily cause plugging in the reservoir. After water flushing, a large amount of carbonate particles scatter in the pores and throats of the reservoir, decreasing the reservoir permeability. On the basis of the defined reservoir damage mechanism, some protective measures (e.g. optimization of doping way and acidification) were put forward. In practical operations, injection pressure at the wellhead of water flooding well dropped by 7 MPa, and daily water-injection volume increased by 6 times, revealing the obvious unplugging effect by acidification.

Key words: western Bohai Sea, water flooding, damage mechanism, acidification

张旭东, 陈科, 何伟, 张铜耀, 陈毅雯. 渤海西部海域某区块油田注水过程储层伤害机理[J]. 中国石油勘探, 2016, 21(4): 121-126.

Zhang Xudong, Chen Ke, He Wei, Zhang Tongyao, Chen Yiwen. Reservoir damage mechanism during water flooding of oilfield in a block, western Bohai Sea[J]. China Petroleum Exploration, 2016, 21(4): 121-126.

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渤海西部海域某区块油田注水过程储层伤害机理

Reservoir damage mechanism during water flooding of oilfield in a block, western Bohai Sea

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