摘要
通过对堵塞物的分离和组分分析,探讨了肯基亚克油田8001井井筒中有机-无机复合堵塞的机理。利用有机溶剂对其堵塞物进行了分离,各组分的含量如下:无机杂质5.31%,正庚烷沥青质48.23%,胶质10.87%。利用X射线衍射分析技术分析了无机物杂质的组成,其中的石英成分高达60.8%。结果表明,盐下油藏8001井井筒的堵塞主要是胶质、沥青质的沉积,并与无机杂质协同作用,加剧了堵塞物的形成;堵塞物中的主要无机杂质并不是来自于储层,而是由于各种施工措施带入的。通过沥青质沉积初始压力预测模型的建立,预测了8001井原油发生沥青沉积的初始压力和初始温度。利用核磁共振技术分析了8001井堵塞物中沥青质、8001井原油中沥青质以及地层沥青质的碳、氢元素组成。结果表明,堵塞物沥青质中的碳元素含量高于原油沥青质中的碳元素含量,堵塞物沥青质中的氢元素含量低于原油沥青质中的氢元素含量,而地层沥青质的碳元素含量最高、氢含量最低,意味着8001井堵塞物中的沥青质并非完全来自于原油,有部分沥青质可能来自于地层沥青层。
The mechanism of organic-inorganic complex plugging for Well 8001 in Kenjiyak Oilfield was investigated by separating and analyzing the plug- ging samples.The composition of the plugging sub- stance was:5.31%(by weight)of inorganic matter, 48.23% of normal heptane asphaltene and 10.87% of resin.By XRD method,the constitution of inorganic matter was analyzed,in which the content of quartz was 60.8%.The results showed that the reason for the plugging of wellbore for Well 8001 was mainly the pre- cipitation of resin and asphaltene in combination with mineral materials.Most of inorganic matter didnt origi- nate from the reservoir and was introduced for various operational procedures.The asphaltene onset precipita- tion pressure and temperature were predicted by estab- lishing a predicting model of onset precipitation pres- sure and temperature.The contents of carbon and hy- drogen element in plugging asphaltene,crude oil as- phahene and asphaltene of reservoir asphaltene layer were analyzed by NMR method.The results showed that the content of carbon element in plugging asphalt- ene was higher than that in crude oil asphaltene and that the content of hydrogen element in plugging as- phaltene was lower than that in crude oil asphaltene, and that the content of carbon element in asphaltene of reservoir asphaltene layer was highest and the content of hydrogen element was lowest among three kinds of asphaltene,which meaned that all of plugging asphalt- ene didnt originate from crude oil and that part of plug- ging asphaltene might originate from asphaltene layer of reservoir.
出处
《石油与天然气化工》
CAS
CSCD
北大核心
2007年第5期412-415,共4页
Chemical engineering of oil & gas
基金
CNPC-阿克纠宾油气股份公司资助项目(基金号:20050908-1982P)。
