第34卷第4期 2017年7月
钻井液与完井液
DRILLINGFLUID&COMPLETIONFLUID
doi: 10.3969/j.issn.1001-5620.2017.04.019
二氧化碳无水压裂增产机理研究
段永伟，张劲2
Vol. 34 No. 4 July2017
（1.吉林油田公司油气工程研究院，吉林松原138001；2.中国石油大学（北京）石油工程学院，北京102249）
段永伟，
张劲
DUANYongwei, Cowpletton Flu
帝民
袁明
浦项拌分最
关键词
中图分类号：
氧化碳无水压裂增产机理研究[]钻井液与完井液，2017，34（4）：101-105
ZHAN Jin
s of co, water-free fracturing method in production increasing[j.Drilling Fladd &
Mechanism 101-105
压裂过并下微地票数据监池
内实跨和压后原
后地层静压吉林油田成后知并产入
有产离的前景
文献标识码
章编号：
1001-5620（2017）04-00101-05
Mechanisms ofCO,Water-freeFracturingMethod inProduction Increasing
DUAN Yongwei', ZHAN Jin?
(1. Research Institute of Oil and Gas Engineering, PetroChina Jilin Oil and Gas Field Company, Songyuan, Jilin 138001;
2. School of Petroleum Engineering, China University of Petroleum, Bejing 102249)
Abstract Limited control range of a single well and insufficient formation energy supplement have long been critical problems affecting the development of tight oil reservoirs. Monitoring of downhole micro seism data during fracturing operation indicates that the volume of fomation stimulated with CO, water-free fracturing is 2.5 times of the volume of formation stimulated with conventional hydraulic fracturing using the same volume of water as that of the CO, used, and the CO, water-free fracturing creates fractures of increased complexity. Laboratory experiment and crude oil sampling after fracturing operation have proved that CO, can effectively reduce the viscosity of crude oil. With the water-free fracturing, miscibility of crude oil is realized and oil displacement efficiency is enhanced. Static pressure test after fracturing shows that oil production after water-free fracturing is remarkably increased compared with the oil production before fracturing, an effect that is similar to advanced formation energy supplement of a well. CO, water-free fracturing technology has been successfully used on 5 oil wells with tight reservoir, remarkably increasing oil production after fracturing. Average oil production increase of 2.31 t/d per well has been gained. The CO, water-free fracturing also caused adjacent wells to produce more oa ads e e e e effective in well stimulation.
Key words Tight oil reservoir; Carbon oxide; Water-free fracturing; Stimulation mechanism; Miscible displacement of reservoir oil
二氧化碳无水蓄能压裂技术在油田上应用已经有近40年的历史，许多文献报道了其在低压敏感性油气藏中的应用和增产效果[-5]。无污染特性是
被广泛提及的二氧化碳无水压裂增产机理(6-列，事实上液态二氧化碳作为压裂液还具有增加裂缝复杂程度，降低原油黏度、增加原油体积系数、提
第一作者简介：段永伟，1983年生主要从事油气费增产改造技术的研究。电话13664387639；E-mail：duanyw@ petrochina.con.cn。
通讯作者：张动，副教投，主要从事储层增产改遗技术的研究。电话（010）89733475；E-mail：zhj718@126.com。
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