分段封闭水锤洗井工艺研究

发布时间：2018-01-03 16:30

本文关键词：分段封闭水锤洗井工艺研究　出处：《中国地质大学(北京)》2016年硕士论文　论文类型：学位论文

【摘要】：分段封闭水锤洗井工艺是在黑河流域重点地区水文地质调查项目的洗井和抽水试验中逐渐探索而来的。该项工艺能够有效清洗井壁泥皮,岩屑,对于长期长期固结在井壁的泥皮也具有常规洗井工艺所不能达到的良好效果。同时,监测软件的使用,也极大限度的提高了洗井抽水工艺的准确性、先进性和科学性。该项工艺巧妙的将洗井工艺和抽水试验合二为一,实现了洗井抽水一体化,降低了工人的劳动强度,提高了水文地质调查的井孔工作的连贯性,有效节省了时间成本。通过引入“渗流”和“水锤”原理解释分段封闭水锤的洗井机理。利用封闭来增大渗流,来减小有效进水面积,加强渗透压力,提高洗井强度。利用开泵停泵来引发水锤效应,增大对井壁的冲击力度改善洗井效果。通过简化、假设复杂的地层条件,介绍了分段封闭水锤洗井过程中产生的压力值公式。由于地层条件等一些其他条件的限制,所推导出的公式只是理想情况下的经验公式,没有考虑现实情况中的能量损失,并不能准确的计算出实际洗井的压力值大小。通过对分段封闭水锤洗井工艺机理的研究,以及对理想情况下经验公式的总结,可以发现影响洗井效果的因素包括井管材料、井管直径、井管厚度、封隔段长度、泵量等。此外,影响洗井效果的因素还包括水泵位置、开停泵时间间隔、人为因素、设备因素和其他因素。通过对影响洗井效果因素的研究,可以将影响因素分为地可调节因素、不可调节因素。可调节因素包括泵量、封隔段长度、水泵位置、开停泵时间、人为因素和设备因素。洗井强度和封隔段长度成反比,和泵量成正比,水泵应放置在靠近下封隔器的一端,开泵时间要确保所取水样颜色无明显变化,停泵时间要保证静水位基本恢复。不可调节因素主要包括地层因素、井管直径、井管厚度、弹性模量和其他因素。分段封闭水锤洗井在地层颗粒大、胶结性好的地层中有良好的洗井效果,在颗粒小、胶结性差的地层中则可能引发井壁坍塌。其他不可调节因素可不作考虑。
[Abstract]:The section closed water hammer well washing process is gradually explored in the well washing and pumping test of the key hydrogeological survey project in the Heihe River Basin. This process can effectively clean the mud and cuttings of the well wall. For the long-term consolidation of mud on the shaft lining also has a good effect that can not be achieved by the conventional well washing process. At the same time, the use of monitoring software, also greatly improve the accuracy of the well washing pumping process. Advanced and scientific. This process cleverly combines well washing process with pumping test, realizes the integration of well washing and pumping, and reduces the labor intensity of workers. The continuity of well hole work in hydrogeological survey is improved, and the time cost is saved effectively. The principle of "seepage" and "water hammer" is introduced to explain the washing mechanism of the water hammer, and the sealing is used to increase the seepage flow. In order to reduce the effective influent area, strengthen the permeation pressure, increase the intensity of well washing, use the open pump and stop pump to induce the water hammer effect, and increase the impact on the well wall to improve the washing effect. Through simplification, assume the complicated formation condition. This paper introduces the formula of pressure value produced in the course of water hammer washing. Due to the limitation of other conditions such as formation conditions, the formula deduced is only an empirical formula under ideal conditions. Without considering the energy loss in the actual situation, it can not accurately calculate the actual value of the value of the well washing pressure. Through the study of the process mechanism of segmented closed water hammer washing, and the summary of the empirical formula under ideal conditions. It can be found that the factors influencing well washing effect include well tube material, well pipe diameter, well tube thickness, sealing interval length, pump volume, etc. In addition, the factors affecting well washing effect include pump position, opening and stopping time interval. Human factors, equipment factors and other factors. Through the study of factors affecting the washing effect, the factors can be divided into ground adjustable factors, non-adjustable factors. Adjustable factors include pump volume, sealing interval length. Pump position, opening and stopping time, human factors and equipment factors. Washing strength and sealing interval length are inversely proportional to pump volume, the pump should be placed near one end of the lower Packer. The pump opening time should ensure that the color of the water sample has no obvious change, and the stop time should ensure the basic recovery of the static water level. The non-adjustable factors mainly include formation factors, well pipe diameter and well pipe thickness. Elastic modulus and other factors. Segmented closed water hammer washing wells in the formation of large particles, good cementation in the formation has a good washing effect in small particles. In formations with poor cementation, wall collapse may be caused. Other unadjustable factors may not be taken into account.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TE252.9

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