摘要
储气库强注强采、反复注采的生产特征决定了储层特征在不断变化,使用常规方法难以准确评价微粒运移对储层的伤害大小。为了给储气库注采方案的科学制定提供实验技术支持,以碳酸盐岩裂缝-孔隙型储气库储层为研究对象,针对储气库实际生产,建立了一套基于生产特征的实验方法;采用岩心伤害评价仪、扫描电镜及浊度仪开展微粒运移对储层伤害的实验研究,定量分析驱替压差递增、波动、正反向的变化引起微粒运移对储层的损害大小。研究结果表明:①基于生产特征建立的实验方法,驱替方式为压差递增、波动、正反向,驱替压差1.5~10 MPa,实现了模拟实际生产全特征的实验评价;②碳酸盐岩裂缝-孔隙型储气库储层微粒运移的第一临界压差4 MPa,第二临界压差8 MPa;③驱替压差波动更容易使前期堵塞孔喉的微粒发生进一步运移,产生自然解堵或新的堵塞,4~8 MPa的驱替压差产生解堵的效果,8~10 MPa的驱替压差产生新的堵塞;④驱替压差方向的变化,可使微粒在喉道及孔隙中来回振荡,使部分大微粒破碎成小微粒进而运移出,使储层渗透率在一定程度上得到改善,缓解储层的伤害。结论认为,碳酸盐岩裂缝-孔隙型储气库在注、采过程中控制一定的生产压差,不但能够满足生产需要,而且减小地面设备负荷,同时能有效缓解由于微粒运移导致的储层伤害。
The production characteristics of intensive and repeated injection and production of gas storage determine that the reservoir characteristics are constantly changing,and it is difficult to accurately assess the reservoir damage due to particle migration by conventional methods.In order to provide experimental and technical support for the scientific development of the gas storage injection and production plan,a carbonate fracture-porosity gas storage reservoir was taken as the research object,and a set of experimental methods based on production characteristics was established for the actual production of the gas storage.The core damage evaluation instrument,scanning electron microscope and turbidity meter were used to carry out the experimental research on the reservoir damage caused by the particle migration,and the quantitative analysis of reservoir damage due to particle migration,which was influenced by increasing,fluctuation,and forward and reverse changes of the displacement pressure difference was carried out.The results showed that:firstly,based on the experimental method established by the production characteristics,the displacement method includes increasing,fluctuation,forward and reverse changes of pressure difference,and the displacement pressure difference is between 1.5 and 10MPa,which fulfills the experimental evaluation by simulating the full characteristics of actual production.Secondly,the first critical differential pressure of the particle migration in the carbonate fractures-pore type gas storage reservoir is 4 MPa,and the second critical differential pressure is 8MPa.Thirdly,the fluctuations of displacement pressure difference are more likely to cause further migration of the particles which have previously blocked the pore throats,resulting in natural unblocking or new blockage.The displacement pressure difference from 4 to 8MPa leads to the unblocking effect,while the displacement pressure difference between 8 and 10MPa causes new blockage.Fourthly,the direction change of displacement pressure difference can make the particles oscillate back and forth in the throats and pores,so that some large particles are broken into small particles and then moved out,which improves the permeability of the reservoir to some extent and decreases the damage of the reservoir.It is concluded that the control of a certain production pressure difference during the injection and production in the carbonate fracture-pore gas storage reservoir can meet the production needs,reduce the load of surface equipment,and effectively alleviate the reservoir damage caused by particle migration.
作者
高新平
彭钧亮
韩慧芬
周玉超
李力民
冯艳
GAO Xinping;PENG Junliang;HAN Huifen;ZHOU Yuchao;LI Liming;FENG Yan(Engineering Technology Research Institute of PetroChina Southwest Oil&Gas Field Company,Guanghan,Sichuan 618300,China;Key Labordatory of Reservoir Stimulation,CNPC,Guanghan,Sichuan 618300,China;Gas Storage Administrative Division of Southwest Oil&Gas field Company,Chognqing 400120,China)
出处
《钻采工艺》
CAS
北大核心
2020年第3期46-49,59,I0003,I0004,共7页
Drilling & Production Technology
基金
中国石油西南油气田分公司2018年科研科学研究与技术开发项目“相国寺储气库注采井储层伤害评价研究”(编号:20180303-12)。
关键词
储气库
碳酸盐岩
裂缝-孔隙型储层
微粒运移
驱替压差
驱替方式
储层损害
gas storage
carbonate rocks
fracture-pore reservoir
particle migration
displacement pressure difference
displacement method
reservoir damage
作者简介
高新平(1983-),工程师,2008年毕业于西南石油大学,现在中国石油西南油气田公司工程技术研究院从事油气井增产技术实验评价与现场应用工作。地址:(618300)四川广汉广东路东一段2号工程院,电话:0838-5151358,E-mail:gaoxinp@petrochina.com.cn。
