非常规油气藏体积压裂全生命周期地质工程一体化技术

doi:10.13809/j.cnki.cn32-1825/te.2021.03.004

摘要/Abstract

摘要：

基于地质工程一体化的理念,针对非常规油气藏体积改造技术的全生命周期的方案优化、实施控制及压后管理等环节,进行了系统的研究、论证和应用验证。主要技术系列包括：①由地质工程双“甜点”、双“甜度”到综合可压度的压前储层评价技术系列;②基于大数据和智能算法的“井网—裂缝—压裂工艺”多参数协同优化技术;③由现场施工数据实时反演储层地质参数的压裂实施控制技术;④考虑渗吸作用的压裂液返排优化;⑤压后综合评估技术及压裂有效期内的生产管理动态优化调整技术等。现场应用效果表明：考虑了全生命周期的地质工程一体化体积压裂技术,可最大限度地挖掘储层的增产、稳产潜力以及提高单井EUR（可采储量）的潜力,对非常规油气藏的“四提”和“降本”等目标的实现,具有十分重要的指导和借鉴意义。

关键词: 体积压裂, 地质工程一体化, 动态优化, 非常规油气藏, 全生命周期

Abstract:

Based on the concept of geology-engineering integration, a systematic research, including theoretical study and field investigation, has been performed on design optimization, implement control and post-frac management of the whole lifecycle of volumetric fracturing technology in unconventional reservoir. The key technologies include: ①the series of pre-frac evaluation technologies regarding geology-engineering double “sweet spots”, double sweetness and comprehensive fracability; ②big data and AI algorithm based “well pattern-fracture-fracturing technique” multi-parameter collaborative optimization technology; ③fracturing control technology based on formation geological properties obtained from inversion study of on-site fracturing operation data; optimization on fracturing fluid flowback scenarios with consideration of imbibition effect; ④comprehensive post-frac evaluation technology; ⑤progressive production management optimization and adjustment technology in effective period of fracturing treatment. Field applications demonstrate that the geology-engineering integration volumetric fracturing technology with consideration of whole lifecycle development can maximize the potential to increase production, stabilize production and improve single well EUR, which has enormous guidance and reference significance towards the achievement of the “Four Improvements” and “Cost Reducing” goals in unconventional reservoir development.

Key words: volumetric fracturing, geology-engineering integration, progressive optimization, unconventional reservoir, whole lifecycle

中图分类号:

TE357

蒋廷学,卞晓冰,左罗,沈子齐,刘建坤,吴春方. 非常规油气藏体积压裂全生命周期地质工程一体化技术[J]. 油气藏评价与开发, 2021, 11(3): 297-304.

JIANG Tingxue,BIAN Xiaobing,ZUO Luo,SHEN Ziqi,LIU Jiankun,WU Chunfang. Whole lifecycle geology-engineering integration of volumetric fracturing technology in unconventional reservoir[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(3): 297-304.

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井式	水平井筒长度（m）	井间距（m）	导流能力（μm²·cm）	缝间距（m）	单段液量（m³）	单段支撑剂量（m³）	注入排量（m³/min）	平台经济净现值（亿元）
4井式	1 205	472	2.9	22	1 820	62	14.6	2.1
6井式	1 015	317	3.1	18	1 526	95	15.0	3.2

压裂段	排量（m³/min）	单段液量（m³）	天然裂缝位置（m）	天然裂缝半缝长（m）
A	10~12	1 331	10.0	12.5
B	12~14	1 545	12.6	15.7

类型	特征描述	裂缝形态
Ⅰ	前期爬升后,后期波动大	多尺度网络裂缝（微缝、支缝改造较为充分）
Ⅱ	前期呈爬升形态,后期平稳、波动小	复杂裂缝（支缝改造较为充分）
Ⅲ	前期快升—快降,后期波动较大	一般复杂裂缝（支缝改造程度低）
Ⅳ	前期快升—快降,后期波动较小	简单双翼裂缝（主缝为主）

井号	水平段长（m）	压裂段数（段）	累计排采时间（月）	目前排液量（m³/d）	累产气量（10⁴ m³）	返排率（%）
A	1 280	22	18	15~30	540	53.51
B	1 400	12	8	32~65	150	59.52