A systematic and comprehensive approach in analyzing produced water re-injection

This paper addresses the issues related to the injectivity maintenance during the process of produced water re-injection. This primary process can be attributed to a particle transport process where the particle clogging on the pore throats near the injection appears to be the dominant mechanism. In this paper, the impacts from all other processes (i.e. mechanical, hydraulic, and thermal influences) on the transport process are also evaluated. Additional processes may be envisioned as secondary, but the preliminary example indeed shows the noticeable impacts from these secondary processes on the primary process. Theoretical formulation of all related processes is general, and can be applied to other petroleum engineering applications besides the issue of produced water re-injection (e.g. sand control, reservoir stimulation, and wellbore stability analysis, etc.). Formulation, solution, interaction, and application of these coupled processes at various levels are detailed in this paper.     

钻屑回注浆体调控及流变性研究

通过室内实验考察钻屑对回注浆体密度、流变参数和滤失性能的影响规律,提出浆体配制方法,总结了国外钻屑回注技术浆体性能调控基本要求.实验结果表明,钻屑含量会显著影响浆体密度、表观黏度、流性指数、API滤失量等性能,配制回注浆体需调节钻屑含量满足回注要求.利用实验筛选的淡水回注浆体配方进行配浆,计算了回注浆体在各流变模式下的流变方程,比较相关系数R得出赫-巴(H-B)模式最优.     

油田注水系统腐蚀因素的分析

油田注水系统管网的腐蚀是油田生产过程中一直难以有效解决的难题。引起腐蚀的因素有物理因素、化学因素和生物因素等。为了揭示油田污水诸多影响因素与腐蚀的相关性,本研究对胜利油田55个不同的污水站污水理化性质进行全面系统的分析,并应用SPSS程序分析了污水中物理、化学和生物因素与腐蚀的相关性。结果表明:污水矿化度(20 g/L)、溶解氧、悬浮物与腐蚀速率的相关系数分别为0.345、0.440、0.305,概率(P)分别为0.039、0.001、0.044,与腐蚀均呈显著正相关;p H值、温度与腐蚀速率的相关系数分别为0.127、0.185,P分别为0.356、0.177,与腐蚀存在相关性,但影响有限;含油量与腐蚀速率的相关系数为-0.295,P为0.029,与腐蚀呈显著负相关。由于各水站都添加杀菌剂,导致细菌与腐蚀速率之间的相关性减弱。