摘要
特稠油油藏蒸汽吞吐过程中,由于原油黏度大,初期蒸汽注入压力过高,难以实现有效加热;后期随着吞吐轮次的增加,开发效果变差。通过在蒸汽中加入化学剂,可以发挥热-化学剂的协同增效作用,提高蒸汽吞吐采收率。通过开展热复合化学体系驱油物理模拟实验,对比了蒸汽吞吐、热化学吞吐和热复合化学吞吐的开发效果,定量评价了热复合化学技术的增产能力。结果表明:热复合化学吞吐多轮次后,相对蒸汽吞吐和热化学吞吐温度场发育扩大明显,波及范围增大;热复合化学吞吐前6个轮次递减率较小,相比较稳产期最长;热复合化学吞吐较蒸汽吞吐累产油提高54%,采出程度提高7.51%,同时提升了单周期的吞吐效果,周期递减率明显降低,热复合化学的增效作用主要体现在吞吐中期3~6轮次。
In the process of steam stimulation in extra heavy oil reservoir, due to the high viscosity of crude oil and the high initial steam injection pressure, it is difficult to realize effective heating;In the later stage, with the increase of steam stimulation rounds, the development effect becomes worse. By adding chemical agents to steam, the synergistic effect of thermal and chemical agents can be brought into play to improve the recovery of steam stimulation. Through the physical simulation experiment of oil displacement with thermal compound chemical system, the development effects of steam stimulation, thermochemical stimulation and thermal compound chemical stimulation were compared,and the production increasing capacity of thermal compound chemical technology was quantitatively evaluated. The results showed that after multiple rounds of thermal compound chemical stimulation, compared woth steam stimulation and thermochemical stimulation, the temperature field of thermal compound chemical technology developed and expanded obviously, and the spread range increased;The decline rate of the first six rounds of thermal compound chemical stimulation was small, and the stable production period was the longest;Compared with steam stimulation, thermal compound chemical stimulation increased the cumulative oil production by 54% and the recovery degree by 7.51%. At the same time, it improved the stimulation effect of single cycle and significantly reduced the cycle decline rate. The synergistic effect of thermal compound chemistry was mainly reflected in 3~6 rounds in the middle of stimulation.
作者
王大为
耿志刚
吴婷婷
高振南
郑文乾
WANG Da-wei;GENG Zhi-gang;WU Ting-ting;GAO Zhen-nan;ZHENG Wen-qian(Bohai Petroleum Institute,Tianjin Branch of CNOOC,Tianjin 300459,China)
出处
《当代化工》
CAS
2023年第1期36-39,43,共5页
Contemporary Chemical Industry
基金
中海石油(中国)有限公司重大科技项目,渤海典型稠油油藏热采提高采收率及关键工艺技术研究(项目编号:YXKY-2021-TJ-01)。
关键词
特稠油
热采
蒸汽吞吐
热复合化学
物理模拟
Thermal compound chemistry
Physical simulation
Extra heavy oil
Thermal recovery
Steam stimulation
