本文選題：二氧化碳　切入點(diǎn)：采油技術(shù)　出處：《東北石油大學(xué)》2015年碩士論文

【摘要】：二氧化碳采油技術(shù)是指向目標(biāo)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、使原油體積膨脹、降低油水界面等性質(zhì),解決目標(biāo)油藏開(kāi)發(fā)中存在的原油流動(dòng)困難、地層能量不足等問(wèn)題,提高油井產(chǎn)量,最終實(shí)現(xiàn)油井的經(jīng)濟(jì)有效開(kāi)發(fā)。二氧化碳采油技術(shù)一般可提高原油采收率5%~15%,延長(zhǎng)油井生產(chǎn)壽命15~20年。世界上很多國(guó)家如美國(guó)、加拿大等國(guó)都在大規(guī)模應(yīng)用,在中國(guó),二氧化碳才有已開(kāi)展了多種采油工藝的研究和現(xiàn)場(chǎng)試驗(yàn),并對(duì)二氧化碳采油適應(yīng)的油藏條件和原油物性范圍進(jìn)行了歸納,通過(guò)數(shù)模實(shí)驗(yàn)和精細(xì)的參數(shù)設(shè)計(jì),在不同油品中開(kāi)展了試驗(yàn),取得了較好的效果。本文通過(guò)對(duì)稠油、超稠油、高凝油及稀油油藏二氧化碳驅(qū)油過(guò)程的研究,總結(jié)得出二氧化碳驅(qū)油的共性機(jī)理主要有以下幾個(gè)方面:1)使原油體積膨脹;2)降低原油粘度;3)多級(jí)混相驅(qū)油;4)降低界面張力。針對(duì)超稠油二氧化碳輔助蒸汽吞吐,二氧化碳采油的個(gè)性機(jī)理表現(xiàn)為:調(diào)整吸汽剖面、擴(kuò)大蒸汽波及體積;針對(duì)高凝油,二氧化碳的個(gè)性機(jī)理表現(xiàn)為:降低原油析蠟溫度,使原油的可流動(dòng)溫度范圍擴(kuò)大。研究了多種采油工藝:二氧化碳驅(qū)油工藝、二氧化碳單井吞吐工藝、二氧化碳泡沫壓裂工藝,根據(jù)工藝的適用目標(biāo)油藏進(jìn)行了注入?yún)?shù)、注入工藝、注入管柱等設(shè)計(jì)。新海27塊屬于海外河油田,位于大洼斷層的海26塊東部,油藏埋深1375~1465 m,主要開(kāi)發(fā)層位為下第三系東營(yíng)組東一段,石油地質(zhì)儲(chǔ)量672.66×104t,地面(50℃)原油粘度為1972~3559 m Pa·s,原油性質(zhì)屬普通稠油,油藏類(lèi)型為厚層-特厚層邊底水油藏。目前油田存在油井產(chǎn)油量低、含水率高等開(kāi)發(fā)問(wèn)題,根據(jù)新海27塊油藏特征及目前存在的問(wèn)題,進(jìn)行了剩余油分布研究,并優(yōu)選出1口水平井,通過(guò)數(shù)值模擬進(jìn)行參數(shù)優(yōu)化設(shè)計(jì),根據(jù)數(shù)模結(jié)論進(jìn)行堵劑+二氧化碳吞吐工藝方案設(shè)計(jì),2014年8月中旬進(jìn)行了現(xiàn)場(chǎng)試驗(yàn)�，F(xiàn)場(chǎng)試驗(yàn)結(jié)果表明:堵劑+二氧化碳吞吐工藝可以有效封堵前期措施形成的竄流通道、改善原油流動(dòng)性能,降低油井含水率的同時(shí)提高原油產(chǎn)量,該工藝為高含水稠油水平井的有效開(kāi)發(fā)探索出一種新的途徑。
[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，

本文編號(hào)：1704920