新疆石油地质 ›› 2020, Vol. 41 ›› Issue (5): 592-598.doi: 10.7657/XJPG20200513

• 油藏工程 • 上一篇    下一篇

稠油油藏火驱前后储集层变化定量表征——以辽河油田高3-6-18井为例

姚倩1a(), 韩登林1a, 王晨晨2, 杨铖晔1a, 陈奇1b   

  1. 1.长江大学 a.地球科学学院;b.资源与环境学院, 武汉 430100
    2.非常规油气湖北省协同创新中心,武汉 430100
  • 收稿日期:2019-12-17 修回日期:2020-03-26 出版日期:2020-10-01 发布日期:2020-10-10
  • 作者简介:姚倩(1993-),女,山西运城人,硕士研究生,储层地质学,(Tel)17720586230(E-mail)201772247@yangtzeu.edu.cn
  • 基金资助:
    国家科技重大专项(2017ZX05008-003-050)

Quantitative Characterization of Reservoir Changes Before and After Fire Flooding in Heavy Oil Reservoirs: A Case Study of Well Gao 3-6-18 in Liaohe Oilfield

YAO Qian1a(), HAN Denglin1a, WANG Chenchen2, YANG Chengye1a, CHEN Qi1b   

  1. 1. Yangtze University, a.School of Geosciences; b.School of Resources and Environment, Wuhan, Hubei 430100, China
    2. Hubei Cooperative Innovation Center of Unconventional Oil and Gas,Wuhan, Hubei 430100, China
  • Received:2019-12-17 Revised:2020-03-26 Online:2020-10-01 Published:2020-10-10

摘要:

火驱是稠油油藏继蒸汽吞吐后提高采收率的技术之一。储集层是决定火驱开发效果的根本因素,而温度是影响火驱储集层变化的主要因素。以辽河油田高3-6-18井为例,通过模拟实验,得到火驱过程中不同阶段的样品,分析了火驱前后储集层的变化,建立了研究区火驱过程中储集层变化模式。研究表明:结焦带的储集层物性较差,Fe(OH)3沉淀物、CaCO3沉淀物和沥青质沉积堵塞孔喉,长石向黏土矿物转化,同时生成大量的硅质胶结物,破坏了粒间孔与粒内溶孔,使孔隙度和渗透率降低,物性变差;燃烧带和已燃带的储集层物性较好,Fe(OH)3和CaCO3沉淀物分解、沥青质沉积的裂解,使孔喉增大,黏土矿物的烧结作用使高岭石向蒙脱石、伊利石转化,同时存在蒙脱石向伊利石的转化,使以黏土矿物为主的粒间填隙物发生不同程度的体积收缩,颗粒和填隙物之间产生裂缝,并随温度升高,裂缝会明显加宽,孔喉增大且连通性变好,孔隙度与渗透率升高。

关键词: 稠油油藏, 火驱, 高3-6-18井, 物理模拟, 储集层, 物性, 结焦带, 燃烧带, 已燃带

Abstract:

Fire flooding is one of the techniques for enhancing oil recovery in heavy oil reservoirs after steam stimulation. Reservoir is the fundamental factor influencing the effect of fire flooding, while temperature is the main factor affecting the changes of reservoirs during fire flooding. Taking the Well Gao 3-6-18 in Liaohe oilfield as an example, based on the physical simulation experiments and the samples obtained from different fire flooding stages, the change mechanism of reservoirs before and after fire flooding was analyzed, and the corresponding reservoir change patterns were established. The study shows that the physical properties of the reservoir in the coking zone are poor. The precipitates of Fe(OH)3 and CaCO3 and asphaltene sediments make the pore throats blocked. The clayization of the feldspar, accompanied with the forming of a large amount of siliceous cements, destroying the intergranular pores and the intragranular dissolved pores and leading the reduction of porosity and permeability. The reservoirs in the combustion zone and burned zone have better physical properties, in which the decomposition of precipitates of Fe(OH)3 and CaCO3 and the cracking of asphaltene sediments can enlarge the pore throats, the sintering of clay minerals makes kaolinite transform into montmorillonite and illite, along with the transformation of montmorillonite to illite, resulting in the volume contraction of intergranular interstitial materials dominated by clay minerals, and finally cracks occur between the particles and the interstitial materials. With the increase of temperature, the cracks become wider, the pore throats become bigger and the connectivity becomes better, then the reservoir porosity and permeability increase as well.

Key words: heavy oil reservoir, fire flooding, Well Gao 3-6-18, physical simulation, reservoir, physical property, coking zone, combustion zone, burned zone

中图分类号: