小直径油管水力喷射压裂摩阻分析

发布时间：2018-03-04 14:55

本文选题：小直径油管　切入点：摩阻　出处：《西安石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来我国各大油田都进入开采的中后期,开采的地质条件和物性越来越差,渗透率越来越低,对储层进行有效的改造是开采低渗透油田的有效手段。水力喷射压裂技术是20世纪90年代末发展起来的增产改造技术,现如今该技术广泛的被使用在我国的各大油田。然而常规油管的水力喷射压裂技术在针对一些特殊井的施工的过程中会遇到很多困难,例如小井眼井、套变井、套破井等。研究小直径油管水力喷射压裂技术对该类井的改造有着重要的意义。本文针对研究区仍60.32mm的小直径油管水力喷射压裂施工为例,优化摩阻计算公式,并利用Fluent软件对管柱及喷嘴内液体流态进行模拟分析,得到以下成果认识：(1)优化摩阻计算公式更加适应研究区小直径油管水力喷射压裂的摩阻计算。(2)对管柱内流体进行模拟,重点观察分析节箍处流体流态,发现节箍处压力、速度变化剧烈,摩阻较大,与节箍磨损情况一致。(3)对喷嘴处液体流态进行模拟,压力在喷嘴处骤然变化,证明此处压降明显。(4)对(?)60.32mm小直径油管水力喷射压裂进行现场试验,施工成功,压力稳定,得出所优化公式的适用性。本文研究成果为小直径油管的摩阻计算及排量预测提供了依据。
[Abstract]:In recent years, the major oil fields in China have entered the middle and late stage of exploitation, the geological conditions and physical properties of exploitation are getting worse and worse, and the permeability is getting lower and lower. Effective modification of reservoir is an effective means to exploit low permeability oil fields. Hydraulic jet fracturing is a new technology developed in late 1990s to increase production. Nowadays, this technology is widely used in the major oil fields in China. However, the conventional tubing hydraulic injection fracturing technology will encounter many difficulties in the process of construction of some special wells, such as small hole wells, casing wells. The study of hydraulic injection fracturing with small diameter tubing is of great significance to the revamping of this kind of well. In this paper, the friction calculation formula is optimized for the hydraulic injection fracturing of small diameter tubing in the study area, which is still 60.32 mm. By using Fluent software to simulate the fluid flow in the pipe string and the nozzle, the following results are obtained: 1) optimizing the friction calculation formula is more suitable for the friction calculation of hydraulic jet fracturing of small diameter tubing in the study area. By observing and analyzing the fluid flow state at the pinch, it is found that the pressure at the pinch has a sharp change in velocity, and the friction resistance is larger. The fluid flow state at the nozzle is simulated in accordance with the wear of the pinch. The pressure changes suddenly at the nozzle. Proof that the pressure drop here is obvious. The hydraulic jet fracturing of 60.32mm small diameter tubing was carried out on the spot, the operation was successful, the pressure was stable, and the applicability of the optimized formula was obtained. The research results in this paper provide the basis for the calculation of friction resistance and the prediction of displacement of small diameter tubing.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.1

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