稠油热采井井筒压力温度场和套管变形机理的研究
发布时间：2019-06-22 13:53
【摘要】：经过30多年的开发,中国的稠油开采工业已经逐渐成熟,随着稀油资源的日趋减少,稠油资源逐渐成为当前乃至今后的主要能源。但是随着蒸汽吞吐工艺的越发成熟,伴生而来的套管损坏问题也越来越严重,经济效益也因此而受到了严重影响。因此对套管的力学性能进行分析,了解套管损坏机理,提出适当的防治措施迫在眉睫。 本文首先分别对均匀载荷与非均匀载荷作用下的套管抗挤强度进行了分析,然后对影响井筒—地层温度场的因素进行分析。再利用热传递基本理论,通过井筒内能量守恒、动量守恒和质量守恒方程,结合单相稳定流井筒温度场预测模型,编制注蒸汽热采井焖井阶段井筒压力场、温度场预测软件。早期在新疆油田对于稠油区块温度场的调研中发现,现场工人对于焖井阶段井筒内的温度分布并不十分了解,甚至完全没有对井筒内温度进行过测量,这对于提早预防套管损坏是非常不利的,所以本程序结合调研得到的两组现场实际井况进行分析计算,并得到两组温度场、压力场数据组,并在与现场调研之后得到的实测数据比对之后发现,温度场、压力场的变化趋势及数据基本一致,误差不大于5%,因此可以判断此模型与软件能够使用于新疆油田百口泉重油区块。 在得到井筒温度场模型后,应用热应力基本理论,对套管水泥环在热应力作用下受力进行分析,并建立套管水泥环界面接触压力模型。对套管-水泥环之间的接触压力以及水泥环与地层之间的围岩压力进行分析；并结合现场井况分别计算出注入380℃至320℃高温蒸汽时套管水泥环地层体系受到的应力以及产生的位移。 在文章的最后,通过上文中对于井筒温度场压力场的分析,以及套管水泥环受力的分析,并结合在新疆油田百口泉区块调研得到的套管损坏情况,得到了套损的主要形式,并对套管损坏机理进行了分析研究,提出了防治套管损坏的若干方法。 本文主要是利用所编制软件对油田现场某井进行温度场、压力场的预测,在发生套管损坏之前就对套管受力进行提早的分析研究,以便有效的缓解现在各大油田都非常关注的套管损坏情况。
[Abstract]:After more than 30 years of development, China's heavy oil production industry has gradually matured. With the decrease of dilute oil resources, heavy oil resources have gradually become the main energy source at present and even in the future. However, with the maturity of steam huff and puff technology, the associated casing damage problem is becoming more and more serious, and the economic benefit has been seriously affected. Therefore, it is urgent to analyze the mechanical properties of casing, understand the damage mechanism of casing, and put forward appropriate prevention and control measures. In this paper, the extrusion strength of casing under uniform load and non-uniform load is analyzed respectively, and then the factors affecting the temperature field of wellbore and formation are analyzed. Based on the basic theory of heat transfer, through the equations of energy conservation, momentum conservation and mass conservation in wellbore, combined with the prediction model of single-phase steady flow wellbore temperature field, the wellbore pressure field and temperature field prediction software in steaming stage of steam injection thermal production well are compiled. In the early investigation of temperature field in heavy oil block in Xinjiang Oilfield, it was found that the field workers did not know very much about the temperature distribution in the wellbore in the braised stage, and even did not measure the temperature in the wellbore at all, which was very disadvantageous to prevent casing damage early. Therefore, this program combined with the two groups of actual well conditions obtained from the investigation, and obtained two groups of temperature field and pressure field data sets. After comparing with the measured data obtained after field investigation, it is found that the variation trend and data of temperature field and pressure field are basically the same, and the error is less than 5%. Therefore, it can be judged that the model and software can be used in Baikouquan heavy oil block of Xinjiang Oilfield. After the wellbore temperature field model is obtained, the stress of casing cement ring under thermal stress is analyzed by using the basic theory of thermal stress, and the interface contact pressure model of casing cement ring is established. The contact pressure between casing and cement ring and the surrounding rock pressure between cement ring and formation are analyzed, and the stress and displacement of casing cement ring formation system after injecting high temperature steam from 380 鈩，
本文编号：2504644
[Abstract]:After more than 30 years of development, China's heavy oil production industry has gradually matured. With the decrease of dilute oil resources, heavy oil resources have gradually become the main energy source at present and even in the future. However, with the maturity of steam huff and puff technology, the associated casing damage problem is becoming more and more serious, and the economic benefit has been seriously affected. Therefore, it is urgent to analyze the mechanical properties of casing, understand the damage mechanism of casing, and put forward appropriate prevention and control measures. In this paper, the extrusion strength of casing under uniform load and non-uniform load is analyzed respectively, and then the factors affecting the temperature field of wellbore and formation are analyzed. Based on the basic theory of heat transfer, through the equations of energy conservation, momentum conservation and mass conservation in wellbore, combined with the prediction model of single-phase steady flow wellbore temperature field, the wellbore pressure field and temperature field prediction software in steaming stage of steam injection thermal production well are compiled. In the early investigation of temperature field in heavy oil block in Xinjiang Oilfield, it was found that the field workers did not know very much about the temperature distribution in the wellbore in the braised stage, and even did not measure the temperature in the wellbore at all, which was very disadvantageous to prevent casing damage early. Therefore, this program combined with the two groups of actual well conditions obtained from the investigation, and obtained two groups of temperature field and pressure field data sets. After comparing with the measured data obtained after field investigation, it is found that the variation trend and data of temperature field and pressure field are basically the same, and the error is less than 5%. Therefore, it can be judged that the model and software can be used in Baikouquan heavy oil block of Xinjiang Oilfield. After the wellbore temperature field model is obtained, the stress of casing cement ring under thermal stress is analyzed by using the basic theory of thermal stress, and the interface contact pressure model of casing cement ring is established. The contact pressure between casing and cement ring and the surrounding rock pressure between cement ring and formation are analyzed, and the stress and displacement of casing cement ring formation system after injecting high temperature steam from 380 鈩，
本文编号：2504644
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