摘要
纯梁油田多为低渗透油藏,突出的地质特征是油层多且单层薄、物性差、岩性复杂、非均质性严重,在钻井、完井、采油、注水、修井作业等过程中,油层污染严重,注采压差大,单井产量低。分析认为,纯梁油田储集层损害的因素主要有3方面:储集层物性、外来流体及不合理的改造措施。针对储集层特点及损害机理,研制出了低伤害综合解堵剂CJD-1,室内性能评价及现场试验均表明,该解堵剂解堵效率高,具有深穿透特性,且对岩石骨架伤害小。该解堵剂已现场推广应用油井9井次,水井10井次,有效率为100%,有效期长(据2005年5月至2006年8月间资料统计,平均有效期在200 d以上),有效期内油井平均单井增油481.3 t,水井单井增注7 441.2 m3,增产增注效果显著。
Most reservoirs in the Chunliang Oilfield are low permeability reservoirs characterized by multiple oil layers, thin single layer, poor physical property, complex lithology and serious aeolotropy. They are seriously damaged during drilling, completion, production, water injection and well repairing, as a result, the injection-production pressure difference is high and the single-well oil production low. The key factors causing the formation damage are reservoir property, external fluid and unreasonable stimulation. A low-damage, comprehensive plug-removing agent （CJD-1 ） is developed based on the formation characteristics and the damage mechanism. Laboratory test and field application show that the agent has good efficiency of relieving blocking, deep penetration and low damage to rock skeletons. It was applied to 9 oil wells and 10 water wells with success ratio of 100%. According to the statistics, the average validity period is over 200 d, the average single-well incremental oil is 481.3 t, and the average incremental injection of individual water well is 7 441.2 m^3 during the period of validity.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2008年第3期330-334,共5页
Petroleum Exploration and Development
基金
国家自然科学基金项目(50274055)
中国石油大学与中国石化胜利油田分公司合作项目(04370502000179)
关键词
低渗透油藏
伤害机理
解堵剂
油层污染
low permeability reservoir
damage mechanism
water block remover
formation damage
