摘要
孤北油田属胜利油区开发难度大的油藏类型,主要原因是该油田低渗透砂岩储集层在不同演化阶段经历了错综复杂的成岩作用,造成原始储集层格架内孔隙体积的缩减,致使钻井过程中被入井液严重污染。为了认识孤北油田油层渗透性损害过程,采用岩石矿物鉴定、样品微区电镜扫描等技术,结合钻井施工过程中配置的入井液性能,对其低渗透砂岩储集层的岩性分布及成分、结构的不均衡性进行了分析,研究钻井过程中入井液的固相微粒迁移、钻井液滤液侵入和黏土矿物影响对储集层渗透性损害的机理。提出了孤北油田在钻井过程中保护低渗透砂岩储集层的措施:采用正电胶钻井液体系;钻井过程中进行钻井液密度动态调整,保证近平衡压力钻进;采用屏蔽暂堵技术阻止钻井液(尤其是其中的固相微粒)进入储集层。采用正电胶钻井液体系和屏蔽暂堵技术后,以往低效试产井区新钻的井试产获商业性油流,获得明显经济效益。表2参3(张守鹏摘)
The Gubei oil field is one of the difficult develop reservoirs in Shengli oil complex. The mostly reason is that low permeability sandstone formations stand intricate diagenesis in different reservoir evolution stage, and reduce a large number of pore volume in reservoir's original framework, resulting in drilling fluid seriously polluted reservoirs in the course of drilling. In order to understand the course that formation permeability was damaged, the different rock and disproportion of its composition and structure of Gubei low permeability sandstone formations have been analyzed by using identification means to the rock and the mineral and electrical scanning microscope to the sample area. Mechanisms of formation permeability damage by micro solid particle migration, invasion of filtering fluid and clay mineral action have been studied as well. The plan of protecting low permeability sandstone formation is offered in the course of drilling. During drilling, the positive colloidal solution is adopted to adjust the drilling fluid density dynamically, to ensure drilling at near balance pressure. Temporarily shielded plugging technique is used to keep drilling fluid (especially, the solid particle) out from reservoir. After that, the newly drilled wells in the old area of the lower production can obtain commercial oil and gas, and bring obviously economic benefit.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2000年第1期80-83,共4页
Petroleum Exploration and Development
关键词
油田
低渗透砂岩
储集层
地层损害
地层保护
Gubei oil field, Low permeability reservoir, Sandstone, Damage, Mechanism, Protection, Measure
