油水井近井带无机结垢动态预测数学模型

在油田注水开发过程中,由于温度、压力等外界环境条件的变化以及不相容水的混合,容易产生无机结垢,堵塞地层孔隙或裂缝,严重影响油田开采.文章在总结国内外无机结垢预测模型基础上,将经典溶液理论、离子互吸理论与多孔介质中非等温渗流以及流体传质等基本原理相结合,建立了更符合油田实际情况的油水井近井带无机结垢动态预测数学模型,并与以往模型预测结果相比较,结果基本可靠.在此基础上,对吉林新民油田某油井结垢情况作出了预测.结果表明,油井无机结垢类型主要是碳酸钙垢,结垢最严重区域为油井井底及近井带,与实际情况基本吻合.该预测模型具有实用意义,可以快速、准确地为现场增产措施提供理论依据.

MATHEMATICS MODEL ON INORGANIC SCALE DYNAMIC PREDICTION NEAR WELL-BORE FORMATION

In the process of oil field development through water injection,the change of outer environment condition and the mixing of unmatching water reduce easily to inorganic scale,and plug formation pores or fracture,influence oil production severely.In this paper,based on summarizing the scale prediction model at home and broad,combining the classic solution theory,ion association theory with non isotherm underground fluid flow and mass transportation in porous media etc basic principles,the mathematics model on inorganic scale dynamic prediction was developed in well bore area of oil and water well,which agrees with practical condition in situ.To compare with earlier prediction model,the result is reliable.At the same time,the scale trend was predicted in an oil well of Xinmin oil field,Jilin.The results show inorganic scale is calcium carbonate and scale in down hole and well bore area is the most severe.It agrees with practical situation basically.So this mathematics model has significance of application and provides theoretic foundation for stimulation in situ fast and truly