油田注水系统结垢趋势及应对措施研究

发布时间：2018-06-22 03:02

  本文选题：HGY-9BS + 注水　； 参考：《华中科技大学》2015年硕士论文

【摘要】：随着油田的开采进入中后期,注水驱替提高采收率是大多数陆地油田的主要手段之一。但这种方法在注水的过程中,外来注入的流体与油田油气层的岩石和地下原有水体接触,会发生各种物理、化学变化,造成产出水的水质变化,再注入井下时产生了严重的结垢趋势,严重影响了油田的正常连续生产,因此研究油田注水系统结垢的趋势和应对措施对油气田的生产有重要实际应用价值。本论文探讨了在胜利油田现场注入水的环境下,N80钢和20#钢的结垢趋势;以动态模拟的方式获得了垢层厚度随时间变化以及垢层厚度增长率随进管口流速变化的关系;还研究了动态模拟状态下HGY-9BS缓蚀阻垢剂的阻垢效力和失效规律,为现场生产提供建议。对于N80钢和20#钢在现场水中结垢趋势的研究发现,随着温度的升高,N80钢和20#钢的腐蚀和结垢均加重,且垢层增厚;动态模拟实验发现,现场水常压环境下垢层厚度随时间变化的规律与钢材的种类和钢材表面粗糙度的关系不明显;在一定范围内,同一条管线相同流量下,湍流动能越大的区域结垢薄而紧密,湍流动能越小的区域结垢厚而疏松,钢片表面垢层最大增长速率与进管口流速的关系为:最大垢层增长率(μm/h)=1.1222×进管口流速v(m/s)+0.5417(v≤1.5m/s),当进管口流速超过一定范围时,对管壁冲刷严重,造成垢层厚度较为随机和不稳定,不易预测。同时还建立了实验条件下垢层厚度的函数模型,并对函数关系进行了简单图像表示。HGY-9BS缓蚀阻垢剂在动态实验中表现出良好的阻垢效率,长达9天的动态实验中最大垢层厚度不超过500μm,最小的厚度不足100μm,实际阻垢效率约50%左右;该缓蚀阻垢剂还具有一定的增溶作用和畸变晶格作用,在钢片表面形成保护膜防止腐蚀的同时还能阻碍晶体沉积以及畸变垢的晶格,造成钢片表面的垢强度较低易于脱落。但是HGY-9BS缓蚀阻垢剂在60℃现场水的环境下48h失去阻垢效力,现场应及时监测HGY-9BS的有效浓度,以便确定加注周期。
[Abstract]:Water flooding is one of the main methods to improve oil recovery in most terrestrial oilfields. However, in the process of water injection, all kinds of physical and chemical changes will occur when the injected fluid contacts with the oil and gas reservoir rocks and the original water body of the oil field, resulting in the change of the water quality of the produced water. When injected downhole, serious scaling trend is produced, which seriously affects the normal and continuous production of oil field. Therefore, it is of great practical value to study the scaling trend and countermeasures of oilfield water injection system in oil and gas field production. In this paper, the scaling tendency of steel N80 and steel 20 # in Shengli Oilfield is discussed, and the relationship between the thickness of scale layer with time and the growth rate of thickness of scale layer with inlet velocity is obtained by dynamic simulation. The scale inhibition effect and failure rule of HGY-9BS corrosion and scale inhibitor under dynamic simulation state were also studied, which provided suggestions for field production. The research on scaling trend of N80 steel and 20 # steel in field water shows that the corrosion and scaling of N80 steel and 20 # steel increase with the increase of temperature, and the scale layer is thickened, and the dynamic simulation experiment shows that the corrosion and scaling of N80 steel and 20 # steel increase with the increase of temperature. The relationship between the thickness of scale layer with time and the type of steel and the roughness of steel surface is not obvious under the environment of water pressure, and in a certain range, under the same flow rate of the same pipeline, the area with larger turbulent kinetic energy is thin and compact. The smaller the turbulent kinetic energy is, the thicker and looser the scaling is. The relationship between the maximum growth rate of the scale layer on the steel sheet surface and the inlet velocity is 1.1222 脳 1. 1222 脳 inlet velocity v (m / s) 0.5417 (v 鈮，

本文编号：2051272