摘要
多元热流体(热水、N2、CO2的混合物)热采技术作为近年来兴起的海上开采新技术,加热范围和吞吐效果与蒸汽不同。利用物理模拟实验方法定量研究N2和CO2的溶解降黏作用,根据海上油田实际地质油藏参数建立水平井单井数模模型,通过蒸汽和多元热流体注入热焓相同和注入热水量相同2种方案,对水平井吞吐加热半径和最终采收率进行研究。结果表明:多元热流体吞吐比蒸汽吞吐提高采收率的幅度大,提高多元热流体中蒸汽的干度,可最大限度发挥N2和CO2的增产作用。现场应用显示,产能提高1.6倍,数模预测井控储量采收率可在冷采基础上提高近10个百分点,为渤海油田数亿吨非常规稠油寻找到有效开发方向。
Thermal recovery technique with multiple thermal fluids,a mixture of hot water,N2 and CO2,is a new offshore recovery technique emerged recently. Its heating range and huff and puff results are different to those of steam recovery technique. Physical simulation experiments were performed to study the dissolution and viscosity- reduction of N2 and CO2quantitatively. Based on real reservoir geologic parameters in offshore oilfield,a single horizontal well numerical simulation model was established. Two programs with the same injected enthalpy and the same injected hot water volume through steam and multiple thermal fluids were performed to study the heating radius of horizontal well and the ultimate recovery. The research results showed that,comparing with steam huff and puff,multiple thermal fluid huff and puff improves more recovery; increasing the thermal quality in multiple thermal fluids could maximize the stimulation results of N2 and CO2. Field application showed that the productivity increased by 1. 6 times. According to numerical simulation prediction,the recovery from well- controlled reserves could increase by nearly 10% comparing with cold recovery.This provides an effective development direction for hundreds of million tons of unconventional heavy oil in Bohai Oilfield.
出处
《特种油气藏》
CAS
CSCD
北大核心
2015年第4期118-120,157,共3页
Special Oil & Gas Reservoirs
基金
中海石油(中国)有限公司重大专项"渤海多元热流体
蒸汽吞吐
SAGD热采关键技术研究"(YXKY-2013-TJ-01)
关键词
稠油油藏
多元热流体
热采水平井
加热半径
蒸汽吞吐
heavy oil reservoirs
multiple thermal fluid
thermal recovery horizontal wells
heating radius
steam huff and puff
