摘要
阿拉德油田哈浅22块疏松砂岩稠油油藏通过试采,发现在注蒸汽开采中存在强水敏等储层损害,未采用有效的储层保护技术。通过分析哈浅22块的岩性特征、孔喉特征、流体特征及热采现状,对储层进行了常温和高温敏感性实验,黏土矿物膨胀、转化、溶解实验等综合分析确定储层注蒸汽损害机理。结果表明:高温速敏比常温速敏略强,高温碱敏弱于常温碱敏;碱性越强,黏土矿物的膨胀率越高;高温蒸汽液的注入会促进高岭石向蒙脱石和方沸石转化,会促进蒙脱石向伊利石和方沸石转化;碱性越强、温度越高,黏土矿物的溶解速度也就越快。依据注蒸汽储层损害机理,从注蒸汽措施优化、抗高温黏土稳定剂等方面提出了相应的保护措施,主要包括:储层注蒸汽开发时注气速度应控制在0.75mL/min以内,pH值控制在9以内可以有效地降低速敏、碱敏损害,在一定程度上降低黏土矿物的膨胀和溶解;注蒸汽前和注蒸汽过程中采用无氯小阳离子黏土稳定剂是抑制黏土矿物膨胀和微粒运移,防止由于储集层固有的水敏性而造成对地层伤害的主要措施。
Haqian 22 block belongs to Alad Oilfield.Through test,we found strong water sensitive reservoir damage because of no effective reservoir protection technology in steam injection production.This paper analysed the characteristics of lithology,pore throat and fluids and thermal recovery of Haqian 22 block and conducted the reservoir sensitivity experiments of the normal temperature and high temperature,clay mineral expansion and transformation,as well as dissolution experiment to determine the steam injection reservoir damage mechanism.The results show that the velocity sensitive high temperature is stronger than that of the normal temperature,and the alkali sensitivity of high temperature is weaker than that of normal temperature;and that the stronger the alkaline,the higher the clay mineral expansion rate is.It is also found that the injection of high temperature steam liquid can promote the transformation of kaolinite to montmorillonite and zeolite,and promote the montmorillonite to illite and analcite transformation;and that the more the alkaline,the higher the the temperature,and the faster the dissolution rate of the clay minerals.On the basis of steam injection reservoir damage mechanism,we can put forward the corresponding protective measures from optimizing the steam injection measures and screening of the clay stabilizer.It is included that gas injection rate should be controlled within 0.75 mL/min and pH control within 9when steam injection development to reduce reservoir damage;using free chlorine small cationic clay stabilizer before and during the process of steam injection can inhibit clay swelling and particle migration,and it is a main measure is to protect the reservoir.
作者
庄严
熊汉桥
尹达
李磊
黄超
刘潇
Zhuang Yan Xiong Hanqiao Yin Da Li Lei Huang Chao Liu Xiao(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China Tarim Oilfield Company, PetroChina, Korla Xinjiang 841000, China)
出处
《地质科技情报》
CSCD
北大核心
2017年第4期203-209,共7页
Geological Science and Technology Information
关键词
疏松砂岩
稠油油藏
黏土矿物
储层损害
抗黏土稳定剂
储层保护
loose sand stone
the heavy oil reservoir
clay mineral
reservoir damage
the clay stabilizer
reservoir protection
