委内瑞拉ANACO油田固井水泥浆体系研究

发布时间：2018-04-27 09:13

本文选题：高强低密度水泥浆 + 防气窜　；参考：《东北石油大学》2017年硕士论文

【摘要】：委内瑞拉东部地区ANACO油田气井区块是委内瑞拉国家石油公司在东部地区固井技术要求最高、难度最大的区块,该区块地层破裂压力梯度低,有高压水层和低压气层,环空容易发生气窜,并含有H_2S和CO_2,呈泥质砂岩。该地区复杂的地质条件给钻井作业及后续完井阶段造成很大困难,特别是固井作业要求十分严格,一旦固井质量达不到要求将会造成完井后井口冒油冒气,产量下降,采收率降低以及井口失控发生井喷事故等严重后果。基于以上认识,ANACO区块固井的复杂性主要源于水泥及材料固有的缺陷和地层条件的多变性,正确认识地质条件对固井的影响和选择合适的固井材料、工艺措施是解决固井难题的基本出发点。本课题通过对国内外现有的高强低密度水泥浆技术、防气窜原理及技术、防腐蚀机理等的发展及研究现状调研,根据紧密堆积原理计算选择合适的减轻剂、增强材料和防腐蚀材料,结合两年来在该地区作业积累的实际经验,研发出能够满足现场固井施工标准要求的高强低密度水泥浆体系、防气窜水泥浆体系和防腐蚀水泥浆体系,综合各水泥浆体系优良性能,设计出了一整套高强低密度、常规密度防腐防气窜水泥浆体系,解决了委内瑞拉东部气田固井中易漏失、酸性气体腐蚀水泥石(环)、气窜问题。本文的研究成果能够很好的解决ANACO地区固井井漏、气窜和腐蚀等固井施工难题,同时对国内外其它地区的复杂井固井、页岩气固井、储气库固井等非常规井固井作业也有借鉴意义,具有良好的应用价值。
[Abstract]:The ANACO oilfield gas well block in the eastern part of Venezuela is the most demanding and difficult area of the Venezuelan National Oil Co in the eastern region. The fracture pressure gradient of the block is low, the high-pressure water layer and the low pressure gas reservoir are high, the air channeling is easy to occur in the annular space, and the H_2S and CO_2 are found in the mudstone. It is very difficult for drilling operation and subsequent completion stage, especially the requirement of cementing operation is very strict. Once the cementing quality is not reached, the well head oil and gas, production decline, recovery rate and wellhead blowout accident are serious after completion of well completion. Based on the above understanding, the complexity of ANACO block cementing is complex. It mainly originates from the inherent defects of cement and material and the variability of the formation conditions, the correct understanding of the influence of the geological conditions on the cementing and the selection of the appropriate cementing materials. The technological measures are the basic starting points for the solution of the cementing problem. According to the close packing principle, the suitable lightening agent is chosen, the material and the corrosion resistant material are reinforced according to the close packing principle, and the high strength and low density cement slurry system, the anti gas channeling cement slurry system and the corrosion protection are developed in combination with the practical experience accumulated in the area for two years. A complete set of high strength and low density, conventional density anticorrosion and anti gas channeling cement slurry system has been designed to solve the problem of leakage in cementing in the eastern Venezuela gas field, acid gas corrosion cement stone (ring) and gas channeling in the east of Venezuela. The research results of this paper can well solve the leakage of cementing wells in ANACO area. Gas channeling and corrosion, such as cementing problems, are also useful for the cementing operation of complex well cementing, shale gas cementing and gas storage cementing in other areas at home and abroad.

【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE256.6

【参考文献】