减氧空气吞吐技术在鲁克沁深层稠油油藏的应用

doi:10.7657/XJPG20200617

摘要/Abstract

摘要：

鲁克沁三叠系深层稠油油藏经过多年的注水开发,出现了含水率上升快、水驱效率低、采出程度低等问题。为了解决水驱矛盾,提高单井产量,提出了减氧空气吞吐的方案。通过室内物理模拟实验和数值模拟研究,分析了减氧空气吞吐的机理,优化了注入参数。基于理论研究结果,在鲁克沁三叠系深层稠油油藏开展了减氧空气吞吐矿场试验,结果表明：减氧空气吞吐降水增油的机理是稠油注减氧空气后存在拟泡点,形成泡沫油流分散降黏,同时封堵水流优势通道,扩大波及体积。注气量、注气速度和焖井时间对减氧空气吞吐效果影响较大,建议单井注气量40×10⁴ m³,注气速度4×10⁴ m³/d,焖井时间8~10 d。鲁克沁三叠系深层稠油油藏共实施减氧空气吞吐400余井次,有效率82%,单井平均初期日增油量4.5 t,综合含水率下降42%,有效期达168 d,有效期内单井增油量480.0 t。因此,减氧空气吞吐是深层稠油的一种有效降水增油技术,对同类型油藏注水开发后提高采收率具有重要的借鉴意义。

关键词: 鲁克沁, 三叠系, 深层稠油油藏, 减氧空气吞吐, 泡沫油流, 降水增油

Abstract:

Over many years of oilfield development by waterflooding, problems such as rapid rise of water cut, low waterflooding efficiency and low recovery percent of reserves have been encountered in deep heavy Triassic oil reservoirs in Lukeqin oilfield. In order to improve waterflooding development effect and increase well production, a hypoxic air huff and puff program was put forward. Then based on laboratory physical simulation experiments and numerical simulation, the mechanism of hypoxic air huff and puff was analyzed, and waterflooding parameters were optimized. Finally taking the deep Triassic heavy oil reservoirs in Lukeqin oilfield as a case, a field test of hypoxic air huff and puff was carried out. The results show that the mechanism of increasing oil production through hypoxic air huff and puff is that a pseudo bubble point would appear after injecting hypoxic air into heavy oil reservoirs, and the heavy oil changes to foam oil which can reduce the viscosity of crude oil and block dominant water channels, as a result expanding the sweeping volume. Air injection rate and volume and soaking time have great influences on the effect of hypoxic air stimulation. It is suggested that the injected gas volume should be about 400, 000 m³, injection rate should be 40, 000 m³/d, and soaking time should be 8-10 days in a single well. Hypoxic air huff and puff has been implemented in the deep Triassic heavy oil reservoirs in more than 400 wells in Lukeqin oilfield, among which 82% of the wells are effective, namely, the oil production increases by 4.5 t/d per well and water cut decreases by 42% at the initial stage; the valid period is 168 days and the cumulative oil production has been increased by 480.0 t per well. These results have proved that hypoxic air huff and puff is an effective technology for increasing oil production while decreasing water cut for deep heavy oil development. These findings are important references to improving oil recovery of similar reservoirs after experiencing waterflooding development.

Key words: Lukeqin, Triassic, deep heavy oil reservoir, hypoxic air huff and puff, foam oil, production increase and water cut decrease

中图分类号:

TE341

高能, 赵健, 何嘉. 减氧空气吞吐技术在鲁克沁深层稠油油藏的应用[J]. 新疆石油地质, 2020, 41(6): 748-752.

GAO Neng, ZHAO Jian, HE Jia. Application of Hypoxic Air Huff and Puff Technology in Deep Heavy Oil Reservoirs in Lukeqin Oilfield[J]. Xinjiang Petroleum Geology, 2020, 41(6): 748-752.

图/表 5

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