姬塬油田硫酸盐垢的解堵和清防技术研究

发布时间：2018-10-24 13:10

【摘要】：注水是低渗透油田开发的重要方式之一,姬塬油田注水开发的主要水源为地下白垩系洛河层水,洛河层水富含SO42-(1200mg/L~2900mg/L),易与油层水中高浓度Ba2+、Sr2+(700mg/L~5000mg/L)生成难溶的硫酸钡锶垢,导致注水井压力升高、地层欠注;并且井筒、地面集输系统也存在硫酸锶钡垢结垢的严重现象,造成地面管网堵塞、采收率降低等系列问题,对油田稳产造成重大影响。本文通过调研,深入了解地面系统、井筒、地层的结垢现状。运用大量实验:包括X-衍射垢样分析、水质配伍性分析、结垢预测、结垢影响因素分析阐明了姬塬油田典型结垢区块的结垢机理。针对井筒及地面集输系统做了防垢剂的评价筛选出TH-60防垢剂;针对地层已形成的硫酸钡锶垢堵塞,运用缓速硫酸盐清垢技术,并通过评价筛选出一种新型的YHJD-1型地层解堵剂。针对姬塬油田结垢特征,从清防结合的角度出发,现场采用TH-60为主的防垢剂和YHJD-1为主的地层解堵剂,分别运用点滴加药、油套环空加药及地层挤注工艺,不仅有效抑制井筒、地面系统的结垢趋势,而且地层硫酸盐垢的溶垢效果明显,基本达到防治结合的目的。
[Abstract]:Water injection is one of the important ways to develop low permeability oil fields. The main source of water injection in Jiyuan oilfield is the underground Cretaceous Luohe formation water, which is rich in SO42- (1200mg/L~2900mg/L), and is easy to form insoluble barium strontium sulfate scale with high concentration of Ba2 and Sr2 (700mg/L~5000mg/L) in reservoir water. As a result, the pressure of water injection well is increased, the formation is underinjected, and the serious phenomenon of strontium barium sulfate scale and scaling also exists in the wellbore and surface gathering and transportation system, resulting in a series of problems, such as the blockage of surface pipe network and the reduction of oil recovery, which have great influence on the stable production of oil field. Through investigation and investigation, this paper deeply understand the current situation of scaling in surface system, wellbore and formation. A large number of experiments are carried out, including analysis of scale samples by X-ray diffraction, analysis of compatibility of water quality, prediction of scaling and analysis of factors affecting scaling. The scaling mechanism of typical scaling blocks in Jiyuan Oilfield is clarified. The scale inhibitor TH-60 is selected for the wellbore and surface gathering and transportation system, and a new type of YHJD-1 type formation plugging agent is selected by using slow rate sulphate scale cleaning technology in view of the formation of barium and strontium sulfate scale clogging. According to the scaling characteristics of Jiyuan oilfield, from the point of view of combination of cleaning and prevention, the field uses TH-60 as the main anti-scaling agent and YHJD-1 as the main deplugging agent, and uses the dripping medicine, the oil ring space and the formation squeezing technology respectively, which not only effectively restrain the wellbore, but also the formation injection technology. The scaling tendency of the ground system and the effect of scale dissolution of sulfate scale in the formation are obvious, which basically achieves the purpose of combining prevention and cure.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE358.5

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