唐鹏飞
TANG Pengfei

• 1:大庆油田有限责任公司采油工程研究院

摘要(Abstract)：

大庆致密油层砂体不连续,水平井钻井易出层,导致砂岩钻遇率低,采用常规压裂容易丢失上下目的层段,需要通过穿层压裂来提高动用程度。为此分别针对扶余和高台子油层钻遇特点,开展真三轴水力压裂物理模拟实验,研究了不同储层其水力压裂裂缝在纵向上穿层及延伸规律,确定了裂缝穿层及延伸规律的影响因素。实验结果表明:扶余油层自泥岩向砂岩穿层整体难度较大,高台子油层自砂岩向泥岩穿层整体难度较小;储层与隔层的应力差及层理对于水力裂缝穿层及延伸有明显影响,其中层间应力差越大,裂缝穿层难度越大,应力差5～8 MPa时水力裂缝易被限制于低应力层;穿层裂缝易沿层理面扩展从而使裂缝复杂化。研究结果可为致密油水平井穿层压裂选井选层及压裂方案优化提供借鉴和指导。
The sandbodies in Daqing tight oil reservoirs are discontinuous, so the horizontal wells are easily drilled out of the pay zones, which will result in the low drilled rate of the sandstones. It is easy to lose the upper and lower target layers if the conventional fracturing is applied in this type of horizontal wells, thus the developed degree of the hydrocarbon reservoirs should be enhanced by layer penetration fracturing. In the light of the drilled characteristics of Fuyu and Gaotaizi oil layers, the physical simulation experiment of real triaxial hydraulic fracturing was carried out respectively to study the longitudinal penetration and propagation rules of the hydraulic fractures respectively in different reservoirs and furthermore to determine the influencing factors on the fracture penetration and propagation. The experimental results show that they are rather difficult for the fractures in Fuyu oil reservoir to penetrate from the mudstone to sandstone; while those in Gaotaizi oil reservoir are just on the contrary; the reservoir-barrier stress difference and beddings have the obvious influences on the penetration and propagation of the hydraulic fractures. The greater the stress difference is, the more difficult the fracture penetration will be. When the stress difference is between 5-8 MPa, the hydraulic fractures are easily limited within the low-stress layer; the penetration fractures tends to propagate along the bedding plane, which will made the fractures complicated. The research results can provide the references and guidance for the well or layer selection and fracturing program optimization in the layer penetration fracturing of the tight-oil horizontal wells.

关键词(KeyWords)： 致密油;水平井;穿层压裂;裂缝延伸;真三轴实验
tight oil;horizontal well;layer penetration fracturing;fracture propagation;true triaxial test

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“大型油气田及煤层气开发”(2017ZX05071)

作者(Author): 唐鹏飞
TANG Pengfei

DOI: 10.19597/J.ISSN.1000-3754.201903040

参考文献(References)：

• [1]崔宝文,林铁锋,董万百,等.松辽盆地北部致密油水平井技术及勘探实践[J].大庆石油地质与开发,2014,33(5):16-22.CUI Baowen,LIN Tiefeng,DONG Wanbai,et al.Horizontal well techniques and their exploration practices in the tight oil reservoirs in North Songliao Basin[J].Petroleum Geology & Oilfield Development in Daqing,2014,33(5):16-22.
• [2]蒙启安,白雪峰,梁江平,等.松辽盆地北部扶余油层致密油特征及勘探对策[J].大庆石油地质与开发,2014,33(5):23-29.MENG Qi’an,BAI Xuefeng,LIANG Jiangping,et al.Fuyu tight oil characteristics and exploration countermeasures in North Songliao Basin[J].Petroleum Geology & Oilfield Development in Daqing,2014,33(5):23-29.
• [3]王始波,李忠权,王丽丽,等.松辽盆地朝长地区扶余油层沉积特征[J].大庆石油地质与开发,2011,30(5):1-7.WANG Shibo,LI Zhongquan,WANG Lili,et al.Sedimentation characteristics of Fuyu reservoir in Chaochang area of Songliao Basin[J].Petroleum Geology & Oilfield Development in Daqing,2011,30(5):1-7.
• [4]黄薇,梁江平,赵波,等.松辽盆地北部白垩系泉头组扶余油层致密油成藏主控因素[J].古地理学报,2013,15(5):635-644.HUANG Wei,LIANG Jiangping,ZHAO Bo,et al.Main control factors of the dense reservoir formation of Fuyu reservoir in Cretaceous Quantou Formation in Northern Songliao Basin[J].Journal of Palaeogeography,2013,15(5):635-644.
• [5]刘雪雪,付广,李冬春,等.松北探区扶余油层油气成藏有利区预测[J].大庆石油地质与开发,2012,31(6):15-19.LIU Xuexue,FU Guang,LI Dongchun,et al.Prediction of favorable zone of oil and gas reservoir in Fuyu reservoir in Songbei exploration area[J].Petroleum Geology & Oilfield Development in Daqing,2012,31(6):15-19.
• [6]樊文钢,王冬梅.水平井可控穿层压裂技术在低渗透油田的应用[J].中外能源,2015,20(2):49-51.FAN Wengang,WANG Dongmei.Application of horizontal well controlled lamination fracturing technology in low-permeability oil fields[J].Chinese and Foreign Energy,2015,20(2):49-51.
• [7]曾志林,韩文超,张涛.葡萄花薄互层水平井穿层压裂技术[J].化学工程与装备,2014(4):93-96.ZENG Zhilin,HAN Wenchao,ZHANG Tao.Thin interlayer horizontal well fracturing technique for Putaohua[J].Chemical Engineering & Equipment,2014(4):93-96.
• [8]刘玉章,王欣.层间应力差对水力裂缝扩展影响的大尺度实验模拟与分析[J].石油钻采工艺,2014,36(4):88-92.LIU Yuzhang,WANG Xin.Large-scale experimental simulation and analysis of interlayer stress difference effect on hydraulic fracture extension[J].Oil Drilling & Production Technology,2014,36(4):88-92.
• [9]WARPINSKI N R,MAYERHOFER M J,VINCENT M C.Stimulating unconventional reservoirs:Maximizing network growth while optimizing fracture conductivity[J].SPE 114173,2009.
• [10] JOHNSON C C,COURREGE D.Advances in openhole packer/sleeve completions coupled with multilaterals provide cost-effective solutions[J].SPE 135268,2010.