二氧化碳采油技术研究

发布时间：2018-04-03 11:03

  本文选题：二氧化碳　切入点：采油技术　出处：《东北石油大学》2015年硕士论文

【摘要】：二氧化碳采油技术是指向目标油藏注入一定量的二氧化碳,利用二氧化碳溶于原油降低原油粘度、使原油体积膨胀、降低油水界面等性质,解决目标油藏开发中存在的原油流动困难、地层能量不足等问题,提高油井产量,最终实现油井的经济有效开发。二氧化碳采油技术一般可提高原油采收率5%~15%,延长油井生产寿命15~20年。世界上很多国家如美国、加拿大等国都在大规模应用,在中国,二氧化碳才有已开展了多种采油工艺的研究和现场试验,并对二氧化碳采油适应的油藏条件和原油物性范围进行了归纳,通过数模实验和精细的参数设计,在不同油品中开展了试验,取得了较好的效果。本文通过对稠油、超稠油、高凝油及稀油油藏二氧化碳驱油过程的研究,总结得出二氧化碳驱油的共性机理主要有以下几个方面:1)使原油体积膨胀;2)降低原油粘度;3)多级混相驱油;4)降低界面张力。针对超稠油二氧化碳辅助蒸汽吞吐,二氧化碳采油的个性机理表现为:调整吸汽剖面、扩大蒸汽波及体积;针对高凝油,二氧化碳的个性机理表现为:降低原油析蜡温度,使原油的可流动温度范围扩大。研究了多种采油工艺:二氧化碳驱油工艺、二氧化碳单井吞吐工艺、二氧化碳泡沫压裂工艺,根据工艺的适用目标油藏进行了注入参数、注入工艺、注入管柱等设计。新海27块属于海外河油田,位于大洼断层的海26块东部,油藏埋深1375~1465 m,主要开发层位为下第三系东营组东一段,石油地质储量672.66×104t,地面(50℃)原油粘度为1972~3559 m Pa·s,原油性质属普通稠油,油藏类型为厚层-特厚层边底水油藏。目前油田存在油井产油量低、含水率高等开发问题,根据新海27块油藏特征及目前存在的问题,进行了剩余油分布研究,并优选出1口水平井,通过数值模拟进行参数优化设计,根据数模结论进行堵剂+二氧化碳吞吐工艺方案设计,2014年8月中旬进行了现场试验。现场试验结果表明:堵剂+二氧化碳吞吐工艺可以有效封堵前期措施形成的窜流通道、改善原油流动性能,降低油井含水率的同时提高原油产量,该工艺为高含水稠油水平井的有效开发探索出一种新的途径。
[Abstract]:Carbon dioxide oil recovery technology is directed to the target reservoir injection of a certain amount of carbon dioxide, the use of carbon dioxide dissolved in crude oil to reduce the viscosity of crude oil, make crude oil volume expansion, reduce oil-water interface and other properties.In order to improve the oil production and realize the economic and effective development of the oil well, the problems of difficult crude oil flow and insufficient formation energy are solved in the development of the target reservoir.Carbon dioxide oil recovery technology can improve oil recovery by 5% and prolong the production life of oil well for 15 ~ 20 years.Many countries in the world, such as the United States, Canada, and other countries are in large-scale application. In China, carbon dioxide has only carried out a variety of oil production technology research and field tests.The reservoir conditions and the range of crude oil physical properties adapted to carbon dioxide oil recovery were summarized. Through mathematical model experiment and fine parameter design, experiments were carried out in different oil products, and good results were obtained.In this paper, the carbon dioxide flooding process of heavy oil, super heavy oil, high pour point oil and thin oil reservoir is studied.It is concluded that the common mechanism of carbon dioxide flooding mainly includes the following aspects: 1) making crude oil volume dilate (2) reducing viscosity of crude oil (3) multistage miscible flooding oil (4) reducing interfacial tension.For super heavy oil with carbon dioxide assisted steam huff and puff, the individual mechanism of carbon dioxide recovery is: adjusting the absorption profile and expanding the volume of steam sweep; for high condensable oil, the individual mechanism of carbon dioxide is to reduce the wax evolution temperature of crude oil.Extend the flow temperature range of crude oil.A variety of oil recovery processes are studied: carbon dioxide displacement technology, carbon dioxide single well huff and puff process, carbon dioxide foam fracturing technology. According to the suitable target reservoir of the process, the injection parameters, injection process and injection string are designed.Block Xinhai 27 belongs to Huaihe Oilfield, located in the east of Hai26 block of Dawa fault, with a buried depth of 1375 ~ 1465 m. The main development horizon is the eastern part of Dongying formation of the Lower Tertiary system.The crude oil viscosity of petroleum geological reserves is 672.66 脳 10 ~ 4 t, the surface is 50 鈩，

本文编号：1704920