摘要
为解决陵水25-1气田地层水矿化度高,结垢严重的问题,通过结垢趋势计算与实验评价,分析了陵水25-1气田的结垢风险,建立了附着系数等结垢程度定量化评价指标,开展其影响规律实验研究,并优选了具有良好阻垢效果的防垢剂。结果表明,陵水25-1气田在地层温度和压力下,存在严重的结垢风险。岩心流动实验表明,垢样附着系数较小,易随流体产生运移,临界流速为0.25 cm^(3)/min,随着驱替时间的增加,岩心渗透率逐渐降低,并在1200 min左右达到平衡,渗透率变化率最大为82.17%,随着温度的升高将会加剧地层水的结垢趋势,最大渗透率变化率为81.86%;优选的防垢剂乙二胺四亚甲基膦酸通过强金属螯合与晶格畸变作用,对陵水25-1气田不同层位地层水的静态及动态防垢效果均大于85%,具有良好的防垢效果。
In order to solve the prominent problems of high salinity and serious scaling of formation water in Lingshui 25-1 gas field,through the scaling trend calculation and experimental evaluation,the scaling risk of Lingshui 25-1 gas field is analyzed,the quantitative evaluation indexes of scaling degree such as adhesion coefficient are established,the experimental research on its influence law is carried out,and the scale inhibitor with good scale inhibition effect is optimized.The results show that there is a serious scaling risk in Lingshui 25-1 gas field under the conditions of formation temperature and pressure.The core test results show that the scale sample has a small adhesion coefficient and is easy to migrate with the fluid.The critical flow rate is 0.25 cm^(3)/min.with the increase of displacement time,the core permeability gradually decreases and reaches equilibrium at about 1200 min.the maximum permeability change rate is 82.17%.With the increase of temperature,the scaling trend of formation water will be exacerbated,and the maximum permeability change rate is 81.86%;The preferred scale inhibitor ethylenediamine tetramethylene phosphonic acid(EDTMPA)has a good scale prevention effect on the static and dynamic scale prevention of formation water in different layers of Lingshui 25-1 gas field through strong metal chelation and lattice distortion.
作者
刘钲凯
邱正松
李佳
邢希金
何松
高健
LIU Zhengkai;QIU Zhengsong;LI Jia;XING Xijin;HE Song;GAO Jian(School of Petroleum Engineering,China University of Petroleum,Qingdao,Shandong 266580;CNOOC Research Institute,Beijing 100028)
出处
《钻井液与完井液》
CAS
北大核心
2022年第1期126-132,共7页
Drilling Fluid & Completion Fluid
基金
国家自然科学基金项目“裂缝地层致密承压封堵机理与温敏智能堵漏新方法研究”(51974354)
国家重点研发计划项目“井筒稳定性闭环响应机制与智能调控方法”(2019YFA0708303)。
关键词
渗透率
防垢剂
矿化度
结垢机理
Permeability
Scale inhibitor
Mineralization degree
Scaling mechanism
