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大芦湖油田樊124断块C〇2混相驱过程中 沥青质沉淀实验研究
李向良1,2
(1.西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500;2.胜利油田地质科学研究院,山东东营257015)
摘要:
针对胜利油区典型的低渗透油田——大芦湖油田樊124断块的油藏条件,利用SDS固体沉淀实验装置对5种 压力下注人ca_过程中沥青质的沉淀情况进行了研究,确定了沥青质沉淀析出的条件及沉淀量,并提出了预防沥青 质沉淀的措施。研究结果表明,在樊124断块进行C02非混相驱,不会产生明显的沥青质沉淀,而在高于26 MPa下 进行COz混相驱时,会产生少量沥青质沉淀,且注人压力越高,沥青质沉淀趋势越强,但由于地层油中原始沥青质含 量较低,产生的沥青质沉淀量不大;根据樊124断块油藏流体条件,在较低的压力(<26 MPa)下进行COz混相驱或 近混相驱,既能获得较高的原油采收率,又能避免或减少沥青质的沉淀。
关键词:  大芦湖油田;COz  混相驱;非混相驱;沥青质沉淀;透光强度;沉淀量
DOI:
分类号:
基金项目:国家“973”重点基础发展规划项目(G1999022508)
Experimental studies on asphaltene precipitation with CO? miscible flooding in Fan 124 block of Daluhu Oilfield
LI Xiang-liang1,2
(1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation in Southwest Petroleum University,Chengdu 610500,China;2. Research Institute of Geological Science of Shengli Oilfield,Dongying 257015, Shandong Province, China)
Abstract:
Based on the characteristics of Fan 124 block in Daluhu Oilfield which is a typical low-permeability oil reservoir in Shengli Oilfield, the result of asphaltene precipitation in the course of CO2 injection under five pressures gradient was studied by the SDS solid precipitation test apparatus. 丁he removal condition and quantity of asphaltene precipitation were determined and some methods which keep asphaltene from precipitating were submitted. It is shown that asphaltene precipitation will not be generated obviously during CO2 non-miscible flooding in Fan 124 block, but when the pressure is more than 26 MPa, a little precipitation is generated. The higher pressure is, the more precipitation is. Because of a low initial content of asphaltene in reservoir oil, a little precipitation is generated ultimately. According to the characteristics of fluids in Fan 124 block, running CQ2 miscible flooding can not only gain higher oil recovery, but also keep asphaltene from precipitating or decrease the precipitation under a lower pressure.
Key words:  Daluhu Oilfield  CO2  miscible flooding  non-miscible flooding  asphaltene precipitation  
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