水力喷射分段压裂密封机理

doi:10.7623/syxb201103023

石油学报 ›› 2011, Vol. 32 ›› Issue (3): 514-517.DOI: 10.7623/syxb201103023

水力喷射分段压裂密封机理

曲海 1 李根生 1 黄中伟 1 李宪文 2 赵文 2 卜向前 2 王晓东 2

1中国石油大学油气资源与探测国家重点实验室北京 102249； 2中国石油长庆油田公司油气工艺研究院陕西西安 710021

收稿日期:2010-10-24 修回日期:2011-01-22 出版日期:2011-05-25 发布日期:2011-07-19
通讯作者: 曲海
作者简介:曲海，男，1981年7月生，2008年获西南石油大学理学硕士学位，现为中国石油大学（北京）石油天然气工程学院在读博士研究生，主要从事油气增产新工艺研究。
基金资助:
国家自然科学基金项目（No.50774089）和国家科技重大专项（2009ZX05009-005-04A）联合资助。

Sealing mechanism of the hydrajet stepwise fracturing

QU Hai 1 LI Gensheng 1 HUANG Zhongwei 1 LI Xianwen 2 ZHAO Wen 2 BU Xiangqian 2 WANG Xiaodong 2

Received:2010-10-24 Revised:2011-01-22 Online:2011-05-25 Published:2011-07-19

摘要/Abstract

摘要：

采用室内试验，结合计算流体力学方法，系统研究了水力喷射分段压裂过程中的密封机理，确定了影响射流密封性能的3个因素，即射流压力、喷嘴直径和套管孔眼直径，并获得了影响规律及计算模型。研究结果表明：高速射流周围存在低压区域，促使环空注入的高压液体流入喷射位置，然后在射流黏滞作用下被带入裂缝中，依靠射流实现密封；密封压力随射流压力和喷嘴直径增大而增加；套管孔眼能够防止孔道的高压液体影响密封压力，辅助高速射流，进一步增强其密封性能；水力喷射分段压裂技术应用于裸眼井时，射流密封性能有限。

关键词: 水力喷射压裂, 密封机理, 低压区域, 室内试验, 计算流体力学

Abstract:

The hydrajet fracturing(HJF) technique depends on a jet stream to achieve a sealing circumstance without any mechanical devices. The present paper systematically studied the sealing mechanism during the hydrajet stepwise fracturing by means of laboratory experiments combined with a computational hydramechanics method, and found three factors that influenced the sealing performance of a jet stream, namely jet-stream pressure, nozzle diameter and casing aperture diameter. Consequently, the paper proposed a law of the influence exerted by these factors and established a calculation model for the influence. The study results showed that there was a low-pressure region around the high-speed jet stream, resulting in the high-pressure fluid of annular water injection to flow to the very position, where it entered fractures under the viscous effect of the jet stream and formed a sealing circumstance. The sealing pressure increased with the increase of the jet-stream pressure and the nozzle diameter. In addition, the casing aperture could further assist the sealing performance of the high-speed jet stream by reducing the effect of the high-pressure fluid in the channel on the sealing pressure. However, the sealing performance of a jet stream was found to decline as the hydrajet stepwise fracturing technique was applied to an open-hole well.

Key words: hydrajet-fracturing, sealing mechanism, low-pressure region, laboratory experiment, computational hydramechanics

曲海李根生黄中伟李宪文赵文卜向前王晓东. 水力喷射分段压裂密封机理[J]. 石油学报, 2011, 32(3): 514-517.

QU Hai LI Gensheng HUANG Zhongwei LI Xianwen ZHAO Wen BU Xiangqian. Sealing mechanism of the hydrajet stepwise fracturing[J]. Editorial office of ACTA PETROLEI SINICA, 2011, 32(3): 514-517.

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水力喷射分段压裂密封机理

Sealing mechanism of the hydrajet stepwise fracturing

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