重质油藏注蒸汽开采预测经济可采储量和经济极限汽油比的方法——兼评国家行业标准的预测方法  

Methods for predicting economically recoverable reserves and economic limit of steam-oil ratio of heavy oil reservoir by steam flooding recovery:Comment on the prediction methods of the national industry standard

作　　者：陈元千[1] 周翠[1] 张霞林[1] 黄祥光[2] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油辽河油田分公司勘探开发研究院,辽宁盘锦124010

出　　处：《油气地质与采收率》2015年第5期1-6,共6页Petroleum Geology and Recovery Efficiency

摘　　要：蒸汽吞吐和蒸汽驱是重质油藏注蒸汽开采的2个重要阶段;经济可采储量和经济极限汽油比,是评价注蒸汽开采的2个重要指标。目前有关重质油藏注蒸汽开采技术可采储量的预测,主要是按照1996和2010年发布的2个国家行业标准提出的注采关系法。该方法是描述累积注汽量与累积产油量的半对数直线关系,其有效应用要依据国家行业标准规定的经济极限油汽比指标中蒸汽吞吐阶段为0.25 t/m3和蒸汽驱阶段为0.15 t/m3;但国家行业标准规定的经济极限油汽比指标过高,致使预测的技术可采储量明显偏低。为此,提出了先利用产量递减法,比较准确地预测经济可采储量;再利用注采关系法,预测经济极限汽油比;研究并分析了国家行业标准的经济极限油汽比指标的不合理性、技术可采储量预测的不可靠性和总技术可采储量的不准确性。通过辽河油田齐40块蒸汽吞吐开采的实际应用表明,新方法预测的经济可采储量为1 573×104t,经济极限汽油比为20 m3/t,相应的经济极限油汽比为0.05 t/m3;而由国家行业标准规定的经济极限油汽比预测的蒸汽吞吐技术可采储量为1 110×104t,仅相当于到2005年的实际累积产油量为1 144×104t。For heavy oil reservoir,steam huff and puff and steam drive are two important stages of steam flooding recovery. The economically recoverable reserves and economic limit of steam-oil ratio are two important indexes to evaluate steam flooding recovery. Up till now,the injection-production relationship method of the national industry standard published in 1996 and 2010 are the main methods to evaluate recoverable reserves of heavy oil reservoir by steam flooding recovery. This method describes the semi-log linear relationship between the cumulative gas injection rate and the cumulative oil production rate and its effective application largely depends on the economic limit of oil-steam ratio(0.25 t/m3 for the steam huff and puff,and 0.15 t/m3 for the steam flooding recovery). However,the economic limit of oil-steam ratio in the national industry standard is rather higher which leads to smaller technically recoverable reserves. The production decline method was firstly used to predict economically recoverable reserves accurately,and then the injection-production relationship method was applied to predict economic limit of steam-oil ratio. At the same time,the irrationalityof the economic limit of oil- steam ratio,the unreliability of the technical recoverable reserves and the incorrectness of the total technically recoverable reserves of the national industry standard were researched and analyzed. The actual application of Block Qi40 in Liaohe oilfield indicates that the economically recoverable reserves predicted by the method in this paper are 1 573×104t,and the economic limit of steam-oil ratio is 20 m3/t and its corresponding economic limit of oil-steam ratio is 0.05 t/m3. However,the technically recoverable reserves predicted by the economic limit of oil-steam ratio according to the national industry standard is 1 110 × 104 t,which equals to the cumulative oil production rate of1 144×104t in 2005.

关 键 词：注蒸汽开采 重质油藏 经济可采储量 经济极限汽油比 预测方法 

分 类 号：TE313.8[石油与天然气工程—油气田开发工程]