本文主要研究内容
作者李星（2019）在《径向钻孔水力压裂裂缝起裂与扩展机理研究》一文中研究指出：由于低渗透油藏所占油田开采比例越来越大,常规开采方法无法达到开采的效果。当前常规射孔压裂会造成油气层渗透率低﹑岩层损伤大﹑增产量低、有效期短等被动局面。径向钻孔水力压裂的出现成为一种新型的油田增产方式。但是,通常认为径向钻孔压裂起裂从钻孔端处起裂。在油田的现场实施中,径向钻孔水力压裂的部分油井存在着增产效果不理想的情况。水力压裂裂缝无法到达目的油层,造成油田增产措施未能预期结果。本文认为径向钻孔水力压裂裂缝从钻孔孔壁上起裂。本文基于应力叠加原理分析径向钻孔周围地应力场的分布状况,对径向钻孔水力压裂裂缝起裂的影响。通过室内大型水力压裂实验以及数值模拟实验得到钻孔参数对水力压裂裂缝起裂与延伸的影响。首先,通过分析径向钻孔周围的所受应力情况,建立径向钻孔周围应力场分布模型,分析钻孔参数对钻孔周围地应力的影响。应力场将分为垂向井筒应力场与径向钻孔应力场两部分求解,每一个应力场又可分为液体压力引起的应力场、钻孔造成的原始地应力重新分布应力场以及压裂液滤失引起的地应力场。其次,通过径向钻孔地应力分布模型,建立径向钻孔水力压裂裂缝的起裂模型。从钻孔孔径,钻孔方位角(与最大水平主应力夹角),地应力差等方向,对径向钻孔裂缝起裂与扩展的影响进行分析。最后,应用ABAQUS有限元扩展软件及水力压裂实验进行径向钻孔参数影响裂缝起裂与扩展的规律研究。最终得出的结论:通过径向钻孔周围应力场的推导,分析了径向钻孔起裂与扩展根本原因。当钻孔角度大于45度时,钻孔孔壁上的应力分布会出现突变现象,裂缝将从孔壁上起裂;随着水平地应力应力差的增加,裂缝起裂位置越靠近垂直井筒,且起裂压力随应力差增大而增大;当钻孔直径越大时,裂缝起裂位置越靠近垂直井筒,但是起裂压力变化较小;当钻孔长度越大时,径向钻孔水力压裂的起裂位置越靠近井筒,起裂压力变化较小。
Abstract
you yu di shen tou you cang suo zhan you tian kai cai bi li yue lai yue da ,chang gui kai cai fang fa mo fa da dao kai cai de xiao guo 。dang qian chang gui she kong ya lie hui zao cheng you qi ceng shen tou lv di ﹑yan ceng sun shang da ﹑zeng chan liang di 、you xiao ji duan deng bei dong ju mian 。jing xiang zuan kong shui li ya lie de chu xian cheng wei yi chong xin xing de you tian zeng chan fang shi 。dan shi ,tong chang ren wei jing xiang zuan kong ya lie qi lie cong zuan kong duan chu qi lie 。zai you tian de xian chang shi shi zhong ,jing xiang zuan kong shui li ya lie de bu fen you jing cun zai zhao zeng chan xiao guo bu li xiang de qing kuang 。shui li ya lie lie feng mo fa dao da mu de you ceng ,zao cheng you tian zeng chan cuo shi wei neng yu ji jie guo 。ben wen ren wei jing xiang zuan kong shui li ya lie lie feng cong zuan kong kong bi shang qi lie 。ben wen ji yu ying li die jia yuan li fen xi jing xiang zuan kong zhou wei de ying li chang de fen bu zhuang kuang ,dui jing xiang zuan kong shui li ya lie lie feng qi lie de ying xiang 。tong guo shi nei da xing shui li ya lie shi yan yi ji shu zhi mo ni shi yan de dao zuan kong can shu dui shui li ya lie lie feng qi lie yu yan shen de ying xiang 。shou xian ,tong guo fen xi jing xiang zuan kong zhou wei de suo shou ying li qing kuang ,jian li jing xiang zuan kong zhou wei ying li chang fen bu mo xing ,fen xi zuan kong can shu dui zuan kong zhou wei de ying li de ying xiang 。ying li chang jiang fen wei chui xiang jing tong ying li chang yu jing xiang zuan kong ying li chang liang bu fen qiu jie ,mei yi ge ying li chang you ke fen wei ye ti ya li yin qi de ying li chang 、zuan kong zao cheng de yuan shi de ying li chong xin fen bu ying li chang yi ji ya lie ye lv shi yin qi de de ying li chang 。ji ci ,tong guo jing xiang zuan kong de ying li fen bu mo xing ,jian li jing xiang zuan kong shui li ya lie lie feng de qi lie mo xing 。cong zuan kong kong jing ,zuan kong fang wei jiao (yu zui da shui ping zhu ying li ga jiao ),de ying li cha deng fang xiang ,dui jing xiang zuan kong lie feng qi lie yu kuo zhan de ying xiang jin hang fen xi 。zui hou ,ying yong ABAQUSyou xian yuan kuo zhan ruan jian ji shui li ya lie shi yan jin hang jing xiang zuan kong can shu ying xiang lie feng qi lie yu kuo zhan de gui lv yan jiu 。zui zhong de chu de jie lun :tong guo jing xiang zuan kong zhou wei ying li chang de tui dao ,fen xi le jing xiang zuan kong qi lie yu kuo zhan gen ben yuan yin 。dang zuan kong jiao du da yu 45du shi ,zuan kong kong bi shang de ying li fen bu hui chu xian tu bian xian xiang ,lie feng jiang cong kong bi shang qi lie ;sui zhao shui ping de ying li ying li cha de zeng jia ,lie feng qi lie wei zhi yue kao jin chui zhi jing tong ,ju qi lie ya li sui ying li cha zeng da er zeng da ;dang zuan kong zhi jing yue da shi ,lie feng qi lie wei zhi yue kao jin chui zhi jing tong ,dan shi qi lie ya li bian hua jiao xiao ;dang zuan kong chang du yue da shi ,jing xiang zuan kong shui li ya lie de qi lie wei zhi yue kao jin jing tong ,qi lie ya li bian hua jiao xiao 。
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论文作者分别是来自东北石油大学的李星，发表于刊物东北石油大学2019-07-15论文，是一篇关于径向钻孔论文,力学模型论文,水力压裂论文,裂缝起裂论文,数值模拟论文,东北石油大学2019-07-15论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自东北石油大学2019-07-15论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：径向钻孔论文; 力学模型论文; 水力压裂论文; 裂缝起裂论文; 数值模拟论文; 东北石油大学2019-07-15论文;