锚定桥式防污染可洗井封隔器研究

发布时间：2018-11-09 16:22

【摘要】：吉林油田有近40%左右的抽油井都存在结蜡现象,热水洗井和化学加药两种方式是目前油井清防蜡的两种主要手段。实际生产过程中,化学加药成本较高,效果不太明显。热水洗井操作容易且成本较低,是油田目前通常采用的主要清防蜡手段,但是对结蜡井进行一次热洗清蜡后,大部分油井存在产量下降,恢复周期长(一般都在3~6天之间)的问题。造成这种现象的原因:一是洗井水进入地层,引起近井地带黏土的水化分散及水锁效应,洗井液污染油层,造成油井产量下降甚至不出液的现象发生;二是洗井水机械杂质含量较大,而地层亏空严重使洗井液倒灌油层进入地层造成油层污染。因此,有必要研制能够防污染的井下工具。本文在广泛调研基础上,分析了洗井对油层造成损害的因素,对目前洗井管柱存在的问题进行了分析,设计了锚定桥式防污染可洗井封隔器及其辅助装置,主要实现了密封油套环空进行油井热洗和锚定管柱提高泵效的目的,通过对目前使用的洗井工具进行研究和改进后,设计出了桥式锚定可洗井防污染封隔器用以油井防污染洗井,此工具可避免洗井过程中洗井液进入地层,达到洗井后不污染地层,同时可以锚定油井生产管柱,提高油井生产泵效的目的,具有较高的经济效益。
[Abstract]:About 40% of the oil wells in Jilin Oilfield have wax deposit phenomenon. Hot water washing and chemical adding are two main methods of cleaning and preventing wax in oil wells at present. In the actual production process, the chemical additive cost is high, the effect is not obvious. The operation of hot water washing wells is easy and the cost is relatively low, which is the main means of wax removal and prevention commonly used in oil fields at present. However, after the first heat washing and cleaning of waxing wells, the production of most wells decreases. The problem of long recovery cycles (usually between 3 and 6 days). The causes of this phenomenon are as follows: first, the well washing water enters the formation, which causes the hydration dispersion and water lock effect of clay in the near well zone, and the well washing fluid pollutes the oil layer, resulting in the decline of oil well production and even the failure to produce liquid; The second is that the mechanical impurity content of washing water is large, and the formation deficit seriously causes the formation pollution caused by the inflow of the well washing fluid into the formation. Therefore, it is necessary to develop downhole tools that can prevent pollution. On the basis of extensive investigation and investigation, this paper analyzes the factors causing damage to reservoir by well washing, analyzes the existing problems of well washing string at present, and designs Anchorage bridge anti-pollution washable well Packer and its auxiliary device. The purpose of heat washing and Anchorage pipe string for oil well washing and Anchorage pipe string are mainly realized. Through the research and improvement of the washing tools used at present, A bridge anchoring and anti-pollution Packer is designed to prevent oil well from polluting and washing well. This tool can avoid well washing fluid entering formation during well washing, so that the formation can not be polluted after washing well, at the same time, the production string of oil well can be anchored. The purpose of improving pump efficiency of oil well is higher economic benefit.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE931.2

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