裂隙性储层压裂缝延伸机理及防治水意义

TE375; 针对由水力裂缝触发的裂隙性储层涌水、突水等地质问题,首先根据弹性力学原理和断裂力学强度准则,基于储层原生裂缝几何特性和压裂液渗流规律,建立了垂直井工况下的起裂压力计算模型;其次考虑煤储层的损伤本构关系,将Dougill损伤因子与起裂压力公式相结合,进一步建立了延伸压力的计算模型;应用经典的PKN模型以及裂缝内净压力的非线性压降规律,建立了改进的压裂缝扩展延伸模型.该模型揭示了裂缝性储层压裂长度L与压裂时间t之间的非线性关系,显示出压裂缝的延伸距离随时间的增加而增长,但前期增长较快,后期基本趋于稳定.豫北焦作恩村区块三口试验井的计算结果,与邻区位村区块微地震实测资料契合度较高,从而...

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Published in东北大学学报（自然科学版） Vol. 42; no. 5; pp. 741 - 747
Main Authors 王志荣, 宋沛, 陈玲霞, 胡凯
Format Journal Article
LanguageChinese
Published 郑州大学 水利科学与工程学院, 河南 郑州 450001 01.05.2021
Subjects
起裂压力
断层突水
压裂缝延伸模型
垂直井
延伸压力
Online AccessGet full text
ISSN1005-3026
DOI10.12068/j.issn.1005-3026.2021.05.020

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Abstract TE375; 针对由水力裂缝触发的裂隙性储层涌水、突水等地质问题,首先根据弹性力学原理和断裂力学强度准则,基于储层原生裂缝几何特性和压裂液渗流规律,建立了垂直井工况下的起裂压力计算模型;其次考虑煤储层的损伤本构关系,将Dougill损伤因子与起裂压力公式相结合,进一步建立了延伸压力的计算模型;应用经典的PKN模型以及裂缝内净压力的非线性压降规律,建立了改进的压裂缝扩展延伸模型.该模型揭示了裂缝性储层压裂长度L与压裂时间t之间的非线性关系,显示出压裂缝的延伸距离随时间的增加而增长,但前期增长较快,后期基本趋于稳定.豫北焦作恩村区块三口试验井的计算结果,与邻区位村区块微地震实测资料契合度较高,从而验证了理论模型的正确性,为现场压裂参数控制以及防治压裂缝突水提供了可靠的技术支撑.
AbstractList TE375; 针对由水力裂缝触发的裂隙性储层涌水、突水等地质问题,首先根据弹性力学原理和断裂力学强度准则,基于储层原生裂缝几何特性和压裂液渗流规律,建立了垂直井工况下的起裂压力计算模型;其次考虑煤储层的损伤本构关系,将Dougill损伤因子与起裂压力公式相结合,进一步建立了延伸压力的计算模型;应用经典的PKN模型以及裂缝内净压力的非线性压降规律,建立了改进的压裂缝扩展延伸模型.该模型揭示了裂缝性储层压裂长度L与压裂时间t之间的非线性关系,显示出压裂缝的延伸距离随时间的增加而增长,但前期增长较快,后期基本趋于稳定.豫北焦作恩村区块三口试验井的计算结果,与邻区位村区块微地震实测资料契合度较高,从而验证了理论模型的正确性,为现场压裂参数控制以及防治压裂缝突水提供了可靠的技术支撑.
Author 胡凯
王志荣
宋沛
陈玲霞
AuthorAffiliation 郑州大学 水利科学与工程学院, 河南 郑州 450001
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CHEN Ling-xia
HU Kai
WANG Zhi-rong
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断层突水
压裂缝延伸模型
垂直井
延伸压力
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