徐启,周晓峰
XU Qi,ZHOU Xiaofeng

• 1:大庆油田有限责任公司第十采油厂
• 2:东北石油大学非常规油气研究院

摘要(Abstract)：

目前常用的水力压裂支撑剂室内评价方法常采用不锈钢代替岩样,利用位移传感器测量裂缝宽度,并基于无应力条件下计算出支撑剂孔隙度,所得出的室内实验结果不能真实反映支撑剂在井下环境的实际性能。针对上述问题,设计了一种新的水力压裂支撑剂性能评价实验仪器,制作了岩样裂缝模型,测试了3种常用水力压裂支撑剂(石英砂、树脂覆膜砂、陶粒)在不同压力条件下的孔隙度、破碎率以及岩样的裂缝宽度,采用内窥镜观察了支撑剂颗粒的破碎和嵌入现象。实验结果表明:随压力的增大裂缝宽度和支撑剂的孔隙度均呈逐渐降低的趋势,随铺砂浓度的增加水力压裂裂缝的宽度和孔隙度呈不断增加的趋势。40 MPa条件下,20/40目石英砂支撑剂的破碎率为24.6%;20/40目陶粒支撑剂的最大嵌入深度为0.17 mm。说明该方法能在受压状态下较好地完成水力压裂支撑剂的性能评价,评价结果可为压裂前支撑剂的选择提供参考。
At present, the stainless steel is often used to replace the rock sample in laboratory evaluating method of the common hydraulic fracturing proppant. The displacing sensor is used to measure the fracture width, and the porosity of the proppant is calculated based on the stress-free condition. The achieved laboratory experimental results can not truly reflect the actual performances of the proppant in underground environment. In the light of the above problems,a new experimental instrument for evaluating the performances of the hydraulic fracturing proppant was designed, and the fracture model of the rock sample was made. The porosity,broken rate and sample fracture width of three commonly used hydraulic fracturing proppants(quartz sand, resin-coated sand and ceramsite) under different pressure conditions were tested. The broken and embedded phenomena of the proppant particles were observed by endoscope. The experimental results show that with the increase of the pressure, the fracture width and the proppant porosity decrease gradually, and moreover with the increase of the sand concentration, the width and porosity of the hydraulic fracture increase gradually.Under the pressure of 40 MPa, the broken rate of 20/40 mesh quartz sand proppant is 24.6%; the maximal embedment depth of 20/40 mesh ceramsite proppant is 0.17 mm. These results show that this method can be used to better evaluate the performances of the hydraulic fracturing proppant under pressure, and moreover the evaluated results can provide the reference for the selection of the proppant agent before the fracturing.

关键词(KeyWords)： 水力压裂;支撑剂;孔隙度;裂缝宽度
hydraulic fracturing;proppant;porosity;fracture width

Abstract:

Keywords:

基金项目(Foundation): “十二五”国家科技重大专项子课题“低渗透油气高效开发井完井优化设计与控制技术”(2011ZX05009-005)

作者(Author): 徐启,周晓峰
XU Qi,ZHOU Xiaofeng

DOI: 10.19597/j.issn.1000-3754.201907029

参考文献(References)：

• [1]刘双,张洪,邱晓惠.黄原胶及其衍生物的耐温耐剪切性能[J].钻井液与完井液,2018,35(1):119-123.LIU Shuang,ZHANG Hong,QIU Xiaohui.Temperature resistance and shear resistance of xanthan gum and its derivatives[J].Drilling Fluid & Completion Fluid,2018,35(1):119-123.
• [2]韩慧芬,彭均亮,吴建.页岩支撑裂缝长期导流能力测试方法及测试装置改造[J].钻采工艺,2018,41(1):55-58.HAN Huifen,PENG Junliang,WU Jian.Test method and reform of long-term diversion capacity of shale supporting fracture[J].Drilling & Production Technology,2018,41(1):55-58.
• [3]刘春亭,李明忠,郝丽华.水力裂缝内支撑剂输送沉降行为数值仿真[J].大庆石油地质与开发,2018,37(5):86-93.LIU Chunting,LI Mingzhong,HAO Lihua.Numerical simulation of the proppant transportation and setting in the hydraulic fracture [J].Petroleum Geology & Oilfield Development in Daqing,2018,37(5):86-93.
• [4]吴春方,刘建坤,蒋廷学.压裂输砂与返排一体化物理模拟实验研究[J].特种油气藏,2019,26(1):141-146.WU Chunfang,LIU Jiankun,JIANG Tingxue.Integrated physical modeling experiment research on sand transport and backflow in fracturing[J].Special Oil & Gas Reservoirs,2019,26(1):141-146.
• [5]杜书恒,庞姗,师永民.水力压裂缝动态非对称延伸过程数值模拟[J].油气地质与采收率,2018,25(4):106-114.DU Shuhuan,PANG Shan,SHI Yungmin.Numerical simulation of dynamic asymmetric extension process in hydraulic fracturing[J].Petroleum Geology and Recovery Efficiency,2018,25(4):106-114.
• [6]蒋廷学,王海涛,卞晓冰.水平井体积压裂技术研究与应用[J].岩性油气藏,2018,30(3):1-11.JIANG Tingxue,WANG Haitao,BIAN Xiaobing.Volume fracturing technology for horizontal well and its application[J].Lithologic Reservoirs,2018,30(3):1-11.
• [7]陈冬,王楠哲,叶智慧.压实与嵌入作用下压裂裂缝导流能力模型建立与影响因素分析[J].石油钻探技术,2018,46(6):82-89.CHEN Dong,WANG Nanzhe,YE Zhihui.Propped fracture conductivity evolution under a combination of compaction and embedment:establishing a model and analyzing the influencing factors[J].Petroleum Drilling Techniques,2018,46(6):82-89.
• [8]卢聪,郭建春,王文耀.支撑剂嵌入及对裂缝导流能力损害的实验[J].天然气工业,2008,28(2):99-101.LU Cong,GUO Jianchun,WANG Wenyao.Experimental research on proppant embedment and its damage to fractures conduchrity[J].Natural Gas Industry,2008,28(2):99-101.
• [9]王丽伟,蒙传幼,崔明月.压裂液残渣及支撑剂嵌入对裂缝伤害的影响[J].钻井液与完井液,2007,24(5):59-61.WANG Liwei,MENG Chuanyou,CUI Mingyue.Effects of fracturing fluid residues and proppant embedment on the fracture impairment[J].Drilling Fluid & Completion Fluid,2007,24(5):59-61.
• [10]WANG J,ELSWORTH D.Role of proppant distribution on the evolution of hydraulic fracture conductivity[J].Journal of Petroleum Science and Engineering,2018,46(1):147-161.
• [11]郭天魁,张士诚.影响支撑剂嵌入的因素研究[J].断块油气田,2011,18(4):527-529,544.GUO Tiankui,ZHANG Shicheng.Study on the factors affecting proppant embedment [J].Fault-block Oil and Gas Field,2011,18(4):527-529,544.
• [12]HU X,WU K ,LI G,et al.Effect of proppant addition schedule on the proppant distribution in a straight fracture for slickwater treatment[J].Journal of Petroleum Science and Engineering,2018,167:110-119.
• [13]郭布民,张士诚,李艳丽.支撑剂嵌入对煤岩水力裂缝导流能力的影响[J].大庆石油地质与开发,2010,29(5):121-124.GUO Bumin,ZHANG Shicheng,LI Yanli.Impact of proppant embedment on flow conductivity of coalbed rock hydraulic fracture [J].Petroleum Geology & Oilfield Development in Daqing,2010,29(5):121-124.
• [14]陈铭,张士诚,柳明.水力压裂支撑剂嵌入深度计算方法[J].石油勘探与开发,2018,45(1):149-156.CHEN Ming,ZHANG Shicheng,LIU Ming.Calculation method of proppant embedment depth in hydraulic fracturing[J].Petroleum Exploration and Development,2018,45(1):149-156.
• [15]TANG Y ,RANJITH P G ,PERERA M S A .Major factors influencing proppant behaviour and proppant-associated damage mechanisms during hydraulic fracturing[J].Acta Geotechnica,2018,13(9):1-24.
• [16]温庆志,张士诚,王雷.支撑剂嵌入对裂缝长期导流能力的影响研究[J].天然气工业,2005,25(5):65-68.WEN Qingzhi,ZHANG Shicheng,WANG Lei.Influence of proppant embedment on fracture long-term flow conductivity[J].Natural Gas Industry,2005,25(5):65-68.
• [17]张树翠,孙可明.储层非均质性和各向异性对水力压裂裂纹扩展的影响[J].特种油气藏,2019,26(2):97-100.ZHANG Shucui,SUN Keming.Hydraulic fracturing crack propagation under various reservoir heterogeneity and anisotropy[J].Special Oil & Gas Reservoirs,2019,26(2):97-100.
• [18]吴奇,胥云,张守良,等.非常规油气藏体积改造技术核心理论与优化设计关键[J].石油学报,2014,35(4):706-714.WU Qi,XU Yun,ZHANG Shouliang,et al.The core theories and key optimization designs of volume stimulation technology for unconventional reservoirs[J].Acta Petrolei Sinica,2014,35(4):706-714.