支撑剂在裂缝中的运移规律及铺置特征
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摘要
针对高闭合应力储层加砂压裂难度大的问题,文中以提高支撑剂在裂缝中的铺置效率和导流能力为目的,利用数值模拟的方法分析了影响支撑剂运移的主要因素,并采用物理模拟实验对数值模型进行校正,进而明确支撑剂在裂缝中的运移规律和铺置特征。结果表明:采用低密度、小粒径支撑剂和高排量、低砂比以及高黏度压裂液体系可以有效降低缝内砂堤平衡高度,延长支撑剂的铺置距离,减少缝内砂堵。依据运移规律及铺置特征分析结果,应用压裂模拟软件对定北区块压裂设计参数进行优化。通过现场应用,施工成功率由75.0%提高至97.8%,产量也取得突破,获得了较好的应用效果。
Aiming at the difficulty of fracturing in high closed stress reservoirs, in order to improve the placement efficiency and conductivity of proppant in fractures, this paper analyzes the influencing factors that affect proppant migration by numerical simulation, and uses the physical experiment to correct the digital model, and then clarifies the migration law and placement characteristics of proppant in fractures. The results show that the low density and small size proppant, high displacement, low sand ratio and high viscosity fracturing fluid can effectively reduce the balance height of the sand dam, prolong the placement distance of proppant, and reduce the sand plugging in fractures. According to the analysis results, the fracturing design parameters of the Dingbei Block were optimized by fracturing simulation software. Through field application, the construction success rate has increased from 75.0% to 97.8%, and the output has also made breakthroughs, and a good application effect has been obtained.
Aiming at the difficulty of fracturing in high closed stress reservoirs, in order to improve the placement efficiency and conductivity of proppant in fractures, this paper analyzes the influencing factors that affect proppant migration by numerical simulation, and uses the physical experiment to correct the digital model, and then clarifies the migration law and placement characteristics of proppant in fractures. The results show that the low density and small size proppant, high displacement, low sand ratio and high viscosity fracturing fluid can effectively reduce the balance height of the sand dam, prolong the placement distance of proppant, and reduce the sand plugging in fractures. According to the analysis results, the fracturing design parameters of the Dingbei Block were optimized by fracturing simulation software. Through field application, the construction success rate has increased from 75.0% to 97.8%, and the output has also made breakthroughs, and a good application effect has been obtained.
引文
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[13]孙海成,胥云,蒋建方,等.支撑剂嵌入对水力压裂裂缝导流能力的影响[J].油气井测试,2009,18(3):8-10.
[14]谢远伟,李军亮,廖锐全,等.压裂井裂缝参数优化研究[J].断块油气田,2010,17(6):762-764.
[15]陈星宇,何昀宾,何封,等.非连续铺砂裂缝动态闭合实验[J].断块油气田,2018,25(3):398-403.
[2]吴亚红,温庆志,张凌莜,等.支撑剂返排控制优化[J].断块油气田,2012,19(5):662-665.
[3]李靓.压裂缝内支撑剂沉降和运移规律实验研究[D].成都:西南石油大学,2014.
[4]温庆志,高金剑,邹俊杰,等.滑溜水压裂支撑剂在水平井筒内沉降规律研究[J].西安石油大学学报(自然科学版),2015,30(4):73-78.
[5]李小龙,肖雯,王凯,等.支撑剂在清洁压裂液中的沉降规律[J].大庆石油地质与开发,2015,34(2):95-98.
[6]王松,杨兆中,李小刚.水力压裂中支撑剂输送的数值模拟研究[J].石油天然气学报(江汉石油学院学报),2009,31(5):380-383.
[7]杨尚谕,杨秀娟,闫相祯,等.煤层气水力压裂缝内变密度支撑剂运移规律[J].煤炭学报,2014,39(12):2459-2465.
[8]郭建春,曾凡辉,余东合,等.压裂水平井支撑剂运移及产量研究[J].西南石油大学学报(自然科学版),2009,31(4):79-82.
[9]黄志文,苏建政,龙秋莲,等.基于Fluent软件的携砂液流动规律模拟研究[J].石油天然气学报,2012,34(11):123-125.
[10]张良然.量纲分析及其在水力学中的应用[J].江西水力科技,1999,25(1):44-46.
[11]邵友元.对量纲分析法与π定理的理解与应用[J].东莞理工学院学报,2010,17(3):106-109.
[12]温庆志,罗明良,李加娜,等.压裂支撑剂在裂缝中的沉降规律[J].油气钻采工程,2009,16(3):100-103.
[13]孙海成,胥云,蒋建方,等.支撑剂嵌入对水力压裂裂缝导流能力的影响[J].油气井测试,2009,18(3):8-10.
[14]谢远伟,李军亮,廖锐全,等.压裂井裂缝参数优化研究[J].断块油气田,2010,17(6):762-764.
[15]陈星宇,何昀宾,何封,等.非连续铺砂裂缝动态闭合实验[J].断块油气田,2018,25(3):398-403.