许建红,崔啸龙,姜恩元
XU Jianhong,CU Xiaolong,JIANG Enyuan

• 1:中国石油大庆油田有限责任公司勘探开发研究院
• 2:中国石油大庆油田有限责任公司试油试采分公司
• 3:中国石油国际勘探开发有限公司开发部

摘要(Abstract)：

在大规模压裂开发过程中，水力压裂裂缝扩展形态及空间展布是致密砂岩储层改造效果定量描述和评价的难点。为了研究水平井水力压裂裂缝扩展形态及空间展布规律，通过落实岩石力学参数，建立油藏地质、岩石力学及地应力模型，利用kinetix水力压裂模拟模块，模拟泊松比、弹性模量、水平应力差、加砂量、压裂液排量以及压裂液总量等参数对复杂缝网形成规律的影响，分析了裂缝起裂和扩展的规律。结果表明：随着泊松比、弹性模量、加液量的增加，裂缝缝长呈减小的趋势，加砂量、主次应力差对裂缝缝长影响较弱；裂缝导流能力随泊松比、单段加液量、加砂量、压裂液排量的增加而增大，主次应力差在6 MPa左右时，裂缝导流能力最高，弹性模量对水力裂缝的导流能力影响相对较小；主次应力差较小时，裂缝展布方向与主应力方向夹角较大；主次应力差较大时，裂缝沿主应力方向延伸。研究结果可为致密油藏储层水平井大规模压裂参数优化和压后定量评价提供技术支撑。
In the process of large-scale fracturing development,the propagation geometry and spatial extension of hydraulic fracturing fractures are challenge for quantitative characterization and evaluation of tight sandstone reservoir stimulation effect. Through determining rock mechanics parameters and establishing reservoir geological, rock mechanics and in-situ stress models, the hydraulic fracturing simulation module of Kinetix software is used to simulate the influence of parameters of Poisson's ratio, elastic modulus, horizontal stress difference, proppant volume, fracturing fluid displacement and total amount of fracturing fluid on the formation law of complex fractures network, and to analyze the law of fracture initiation and propagation. The results show that fracture length decreases with increase of Poisson's ratio, elastic modulus and fluid addition, and proppant volume and principal and secondary stress difference have less influence on fracture length influence. Fracture conductivity increases with increase of Poisson's ratio, single-stage fracturing fluid volume, proppant volume and fracturing fluid displacement. When principal and secondary stress difference is about 6 MPa, fracture conductivity is the highest, and elastic modulus has less impact on hydraulic fracture conductivity. When principal and secondary stress difference is small, the angle between fracture orientation and principal stress orientation is large. When principal and secondary stress difference is large, fractures extend along principal stress orientation. The research provides technical support for largescale fracturing parameters optimization and post-fracturing quantitative evaluation of horizontal wells in reservoirs.

关键词(KeyWords)： 致密储层;水力压裂;裂缝参数;数值模拟;影响因素
tight sandstone;hydraulic fracturing;fracture parameter;numerical simulation;influencing factor

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“低渗、特低渗复杂油藏规模有效动用关键技术”（2017ZX05013-006）

作者(Author): 许建红,崔啸龙,姜恩元
XU Jianhong,CU Xiaolong,JIANG Enyuan

DOI: 10.19597/j.issn.1000-3754.202208036

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