碳酰胺辅助SAGD提高超稠油Ⅲ类油藏采收率技术

doi:10.3969/j.issn.1006-6535.2022.04.015

摘要/Abstract

摘要： 超稠油Ⅲ类油藏原油黏度高、渗透率低、夹层发育,在蒸汽辅助重力泄油(SAGD)生产中存在蒸汽腔扩展慢、泄油阻力大、产量与油汽比“双低”等现象,针对该问题,提出了碳酰胺辅助SAGD技术,采用室内实验与数值模拟结合的方法,揭示其机理并进行关键参数优化。研究表明,碳酰胺注入蒸汽腔后具有乳化降黏、提高驱油效率和改善水敏等作用。以地质条件和采出程度为依据,制订油藏筛选标准,优选出风城油田Z井区试验井组,并开展优化设计,设计碳酰胺注入质量分数为60%,注入温度为60~100 ℃,注入量为42 t,注入井焖井时间为60 min,后续蒸汽顶替段塞为10 t,生产井焖井时间90 min后转正常SAGD操作。与纯蒸汽SAGD相比,1 a期内平均日产油提高3.8 t/d,油汽比提高0.04,按照油价1 988 元/t测算阶段投入产出比为1∶5,预测最终采收率提高9.4个百分点,最终达到55.7%。研究成果对提高超稠油Ⅲ类油藏SAGD开发效果具有重要意义。

关键词: 超稠油Ⅲ类油藏, SAGD, 碳酰胺, 驱油效率, 采收率

Abstract: Class Ⅲ super-heavy oil reservoirs are featured by high crude oil viscosity, low permeability and well-developed interlayers. In the production with steam-assisted gravity drainage (SAGD), there are slow steam chamber expansion, high oil drainage resistance, low production and low oil-steam ratio. In order to solve these problems, a carbamide-assisted SAGD technology was proposed. Its working principle was discovered and key parameters were optimized by the combination of laboratory tests and numerical simulation. The study showed that the carbamide injected into the steam chamber could bed emulsified to reduce the viscosity, enhance oil displacement efficiency and improve water sensitivity. On the basis of the geological conditions and recovery percent, reservoir selection standards were developed and a test well cluster was selected for Well Block Z in Fengcheng Oilfield. An optimal design was developed, with carbamide injection concentration of 60%, injection temperature of 60-100 ℃, injected amount of 42 t, shut-in duration of 60min for injection well, and subsequent steam displacement slug of 10 t. SAGD was then conducted in the production well after 90 min shut-in. Compared with SAGD with pure steam, the average daily oil production increased by 3.8 t/d during the one-year period, the oil-steam ratio was increased by 0.04, the input-output ratio was 1∶5 at an oil price of 1 988 yuan/t in the calculation stage, and the predicted final recovery efficiency was increased by 9.4 percentage points to reach 55.7%. The study results are of great significance to improve the SAGD development effect of Class Ⅲ super-heavy oil reservoirs.

Key words: Class Ⅲ super-heavy oil reservoir, SAGD, carbamide, oil displacement efficiency, recovery efficiency

中图分类号:

TE345

赵长虹, 王丽, 王攀, 王立龙, 姜丹, 张宝真. 碳酰胺辅助SAGD提高超稠油Ⅲ类油藏采收率技术[J]. 特种油气藏, 2022, 29(4): 107-113.

Zhao Changhong, Wang Li, Wang Pan, Wang Lilong, Jiang Dan, Zhang Baozhen. Carbamide-assisted SAGD Technology for Enhanced Oil Recovery of Class Ⅲ Super-heavy Oil Reservoirs[J]. Special Oil & Gas Reservoirs, 2022, 29(4): 107-113.

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