摘要
与陆上油田相比,渤海油田在储层地质特征、注采参数和完井方式等方面存在较大差异。为解决渤海油田注入液窜流技术难题,以渤海油田储层和流体为实验平台,开展封堵剂组成筛选和性能评价实验研究。结果表明,封堵剂是由主剂与增粘剂、固化剂和缓凝剂等组成的灰黑色致密固体,具有较高的抗压强度和较低的渗透性,是一种大尺寸优势通道封堵材料。封堵剂溶剂水总矿化度与固化时间相关性不大,但溶剂水中的CO_3^(2-)和HCO_3^-有益于延缓固化时间。从技术经济角度考虑,主剂质量分数不低于30%,缓凝剂质量分数为0.05%~0.1%。通过调节缓凝剂用量,可以满足矿场施工时间要求。当封堵剂组成为质量分数为5%的增粘剂+质量分数为0.15%的固化剂+质量分数为0.1%的缓凝剂+质量分数为30%的主剂时,其固化时间约为20 h。
Compared with the onshore oilfield,Bohai Oilfield has great differences in reservoir geological characteristics,injection-production parameters and completion methods. In order to solve the technical problem of the fluid channeling in Bohai Oilfield,the experimental study on the composition selection and performance evaluation of the plugging agent was carried out based on the reservoir characteristics and fluid properties in Bohai Oilfield. The results show that the plugging agent is a dark gray compact solid,which consists of main agent,curing agent,thickener and retarder. It is a kind of plugging agents for large-size prefenrential channels which have the characteristics of high compressive strength and low permeability. Little correlation between total mineralization degree of the solvent and curing time,however,the CO_3^(2-)and HCO_3^- in the solvent are beneficial to prolong the curing time. From the technical and economic point of view,the mass fraction of main agents is no less than 30% and the mass fraction of retarder ranges from 0.05% to 0.1%. Construction time can met the requirements by adjusting the the mass fraction of the retarder. When the formula of the plugging agent is made up of"thickener 5% + curing agent 0.15% + retarder 0.1% + main agent 30%",the curing time is about 20 h.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2017年第6期103-107,共5页
Petroleum Geology and Recovery Efficiency
基金
国家科技重大专项“渤海双高油田多级窜逸堵调驱一体化技术研究及示范”(2016ZX05058-003-010)
中海石油(中国)有限公司天津分公司重点攻关课题“无机复合地质聚合物凝胶调堵技术及其配套方法研究”(CCL2016TJTJLST0676)
关键词
大尺寸优势通道
固化时间
封堵剂
性能评价
渤海油田
large-size prefenrential channels
curing time
plugging agent
performance evaluation
Bohai Oilfield
