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罗红文,李海涛,李颖,等. 分段压裂水平井的温度分布预测模型[J]. 科学技术与工程, 2020, 20(29): 11915-11922.
LUO Hongwen,LI Ying,et al.Temperature Prediction Model for Multistage Fractured Horizontal Well[J].Science Technology and Engineering,2020,20(29):11915-11922.
分段压裂水平井的温度分布预测模型
Temperature Prediction Model for Multistage Fractured Horizontal Well
投稿时间:2019-07-04  修订日期:2020-06-25
DOI:
中文关键词:  温度预测模型  压裂水平井  低渗气藏  温度剖面  敏感性分析
英文关键词:Temperature prediction model  Fractured horizontal well  Low-permeability gas reservoir  Temperature profiles  Sensitivity analysis
基金项目:国家重大科技专项(2016ZX05021-005-009HZ)资助。
                 
作者单位
罗红文 西南石油大学 油气藏地质及开发工程国家重点实验室
李海涛 西南石油大学 油气藏地质及开发工程国家重点实验室
李颖 西南石油大学 油气藏地质及开发工程国家重点实验室
蒋贝贝 西南石油大学 油气藏地质及开发工程国家重点实验室
卢宇 西南石油大学 油气藏地质及开发工程国家重点实验室
崔小江 西南石油大学 油气藏地质及开发工程国家重点实验室
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中文摘要:
      温度预测模型是实现基于分布式温度测试(DTS)解释产出剖面的基础,但定量预测低渗气藏压裂水平井温度剖面仍是一个难题。为此,建立了一套考虑多种微热效应的低渗气藏压裂水平井耦合温度预测模型,模拟了一口低渗气藏压裂水平井的温度剖面,分析了温度剖面特征,并采用正交试验分析法评价了压裂水平井温度剖面对不同因素的敏感性。研究结果表明:①压裂水平井温度剖面呈现出不规则的“锯齿状”,任一“锯齿”都对应着一条有效人工裂缝;②各级裂缝处的井筒温降基本上与裂缝半长呈正相关关系;③从趾端到跟端,各级裂缝位置处的井筒温降与裂缝半长的比值(△T/xf) 依次递减;④压裂水平井温度剖面对各因素的敏感性依次为:裂缝半长>产量>地层渗透率>井筒半径>地层孔隙度>裂缝导流能力>水平倾角。该研究成果为实现基于DTS解释压裂水平井产出剖面提供了模型基础和理论支撑,对于压裂水平井改造效果评价和出水位置定量诊断具有重要意义。
英文摘要:
      Temperature prediction model is the basis of interpreting temperature data from distributed temperature sensors (DTS) to flow profiles, however, it’s still a great challenges to quantitatively predict the temperature profiles of fractured horizontal wells in low-permeability gas reservoir(LPGR). In this paper, a coupled temperature prediction model was developed with considering several subtle heat effects. The temperature profiles of a fractured horizontal well in LPGR were simulated and the characteristics of the temperature profile were analyzed. In addition, using the orthogonal tests analysis method, we evaluated the sensitivity of the temperature profile of a fractured horizontal well to different factors. And the following research results were obtained. First, the temperature profile shows a irregular “serrate shape” and any individual serration corresponds to an effective artificial fracture. Second, the wellbore temperature drops at each fracture location are positively associated with the half-length of the corresponding fracture. Third, the ratio of the wellbore temperature drops to the corresponding half-length (T/xf) of each fractures decrease successively from the toe to the heel. Fourth, the sensitivity of the wellbore temperature profile to different factors are as following: fracture half-length>production rate> permeability>wellbore radius>porosity>fracture conductivity>horizontal dip. The research results provide model basis and theoretical support for interpreting production profile of fractured horizontal wells based on DTS. It has great significance for the post fracturing evaluation and the quantitative diagnosis of the water-exit locations.
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