吐哈油区稀油油藏开发实践及技术攻关方向

doi:10.7657/XJPG20200609

摘要/Abstract

摘要：

吐哈油区稀油油藏经历30 a的开发与实践,形成了一系列稀油油藏高效开发的方法。由于主力油田稀油油藏多为特低渗—低渗油藏,储集层非均质性强,低含水开发阶段采用强采强注面积井网,采油速度较高,开发效果较好;中—高含水阶段及时采取了井网加密等对策,短期为减缓递减、稳定产量发挥了重要作用。但油田开发初期的强注强采也影响了主力层的驱油效率和采收率,尤其是进入特高含水期,无效注水循环严重,套损井和停产井增多,造成地层压力保持水平低,常规措施治理难度大,稀油油藏开发进入低速低效开采阶段。为了从根本上提高开发效果,积极开展注气提高采收率、纳米微球复合调驱及转变渗流场等室内研究和矿场先导试验,取得了初步效果,形成一系列多元类型油藏分类提高采收率和提高开发效果的技术。随着这些技术的进一步发展和应用,吐哈油区稀油油藏自然递减率有望由19.8%逐步降至11.0%,采收率将提高2.00%~3.00%。

关键词: 吐哈油区, 稀油油藏, 开发实践, 高效开发, 潜力分析, 驱油效率, 采收率, 技术攻关

Abstract:

After 30 years of development, a series of efficient development technologies have been formed for thin oil reservoirs in Tuha oil region. Most of the thin oil reservoirs are of ultra-low to low permeability and very heterogeneous. In the early development stage with low water cut, the reservoirs were developed by powerful oil production and water injection through areal well patterns. During that stage, the oil production was high and the development effect was good. Then in the intermediate stage with medium to high water cut, infilled well pattern was used, which played an important role in slowing down the production decline and stabilizing the production in a short term. However, early powerful production and injection affected the oil displacement efficiency and recovery of the primary pay zones. Especially after entering the late development stage with extra-high water cut, water injection was more and more invalid, and many oil wells suffered from damaged casing or suspending, resulting in low reservoir pressure. It’s difficult to stimulate the thin oil reservoirs by conventional measures, so the development of the thin oil reservoirs was shown as low production rate and low efficiency. In order to fundamentally improve the development effect, Tuha oilfield has actively carried out a series of indoor researches and field pilot tests such as gas injection, composite flooding with nano-micro balls and changing flowing field, made preliminary achievements and formed a series of technologies. With further development and application of these technologies, the natural production decline of the thin oil reservoirs is expected to be controlled from 19.8% to 11.0%, and the recovery is expected to increase by 2.00% to 3.00%.

Key words: Tuha oil region, thin oil reservoir, development practice, efficient development, potential analysis, oil displacement efficiency, recovery, technology tackling

中图分类号:

TE341

周波. 吐哈油区稀油油藏开发实践及技术攻关方向[J]. 新疆石油地质, 2020, 41(6): 697-703.

ZHOU Bo. Practices and Technology Tackling in Developing Thin Oil Reservoirs in Tuha Oil Region[J]. Xinjiang Petroleum Geology, 2020, 41(6): 697-703.

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