本文選題：縫洞型油藏 + 注氣��； 參考：《長(zhǎng)江大學(xué)》2015年碩士論文

【摘要】：縫洞型油藏在世界油氣資源中占有十分重要的位置,這類油藏儲(chǔ)層非均質(zhì)性嚴(yán)重,流體分布復(fù)雜,縫洞本身的多尺度性和連通多樣性給開(kāi)發(fā)造成困難。近幾年隨著塔河油田縫洞型油藏的不斷開(kāi)采,對(duì)縫洞型油藏的開(kāi)發(fā)有一定的認(rèn)識(shí)。塔河油田在前期通過(guò)注水替油和單元注水來(lái)緩解油藏產(chǎn)量遞減的情況,但是在開(kāi)發(fā)后期,注水替油效果變差,含水率上升過(guò)快,殘存在縫洞高部位的“閣樓油”難以采出,僅僅采用注水措施已經(jīng)很難滿足開(kāi)發(fā)需求。國(guó)內(nèi)外開(kāi)發(fā)研究表明,對(duì)于后期高含水油藏,注氣是一種行之有效的方法。對(duì)油藏注氣可以通過(guò)重力分異、恢復(fù)地層壓力、降低原油粘度等機(jī)理改善油藏開(kāi)發(fā)效果,進(jìn)一步提高原油采收率。本文的研究?jī)?nèi)容主要來(lái)自中國(guó)石化西北石油局的研究課題。在經(jīng)過(guò)大量的相關(guān)文獻(xiàn)調(diào)研后,本文根據(jù)相似準(zhǔn)則,以油藏縫洞分布規(guī)律為基礎(chǔ)設(shè)計(jì)了耐高溫高壓全直徑縫洞氣驅(qū)物理模型以及單井替油模型,運(yùn)用該實(shí)驗(yàn)裝置完成注氮?dú)馐覂?nèi)替油實(shí)驗(yàn),分析哪種方式最有利于油藏開(kāi)發(fā),本文主要完成的內(nèi)容有：1、完成單井模型中底水、注氣方式以及油藏含油體積對(duì)注氣采收率的影響。研究結(jié)果表明：底水充足時(shí)可利用底水能量驅(qū)油,在注氣輪次相同時(shí)底水充足油藏注氣采收率高于無(wú)底水；實(shí)驗(yàn)針對(duì)底水油藏采用了單純注氣、水氣交替及水氣混注三種方式,底水驅(qū)過(guò)后殘存在單井上部的“閣樓油”難以采出,通過(guò)注氣可以驅(qū)出部分剩余油,控制底水錐進(jìn)速度,最終得出在底水充足時(shí)單純注氣方式效果最好；在油藏含油體積大時(shí)采用注氣方式效果更加顯著。2、完成縫洞型物理模型驅(qū)油實(shí)驗(yàn),主要研究了氮?dú)怛?qū)替、注氣速度、原油粘度、注氣方式對(duì)采收率的影響。研究表明：在進(jìn)行水驅(qū)過(guò)后縫洞模型中存有部分剩余油,通過(guò)注氣后可以改善液體流動(dòng)條件,進(jìn)一步提高采收率；注汽速度的選擇會(huì)影響最終采出程度,存在一個(gè)最佳注入速度,使得氣體能夠進(jìn)入裂縫與原油充分混合而不至于過(guò)早發(fā)生氣體突破；同時(shí)還對(duì)比了非均質(zhì)條件不同注氣方式對(duì)采收率的影響.,實(shí)驗(yàn)結(jié)果表明,非均質(zhì)性嚴(yán)重的縫洞油藏采用注氣替油方式能開(kāi)采出驅(qū)替方式中無(wú)法波及到的低滲透單元。
[Abstract]:Fracture-cavity reservoirs play a very important role in the world's oil and gas resources. The reservoir heterogeneity is serious, fluid distribution is complex, and the multiscale and connected diversity of fractures and cavities makes the development difficult. In recent years, with the continuous development of fracture-cavity reservoirs in Tahe Oilfield, there is a certain understanding of the development of fracture-cavernous reservoirs. In Tahe Oilfield, oil displacement and unit water injection were used in the early stage to alleviate the decline of reservoir production. However, in the later stage of development, the effect of replacing oil with water was poor, the water cut increased too quickly, and it was difficult to produce the "loft oil" remaining in the high part of fracture and cavity. It is difficult to meet the development demand by using water injection measures alone. Domestic and foreign development studies show that gas injection is an effective method for late high water cut reservoirs. Through gravity differentiation, recovery of formation pressure, reduction of oil viscosity and other mechanisms, gas injection can improve reservoir development efficiency and further improve oil recovery. The research content of this paper mainly comes from the research subject of Northwest Petroleum Bureau of Sinopec. After a lot of related literature research, based on the similarity criterion, the physical model of high temperature and high pressure diameter gas drive and the model of single well replacement oil are designed based on the distribution of fracture and cavity in oil reservoir. In this paper, the main contents of this paper are as follows: 1, the effect of bottom water, gas injection mode and oil volume of single well model on gas injection recovery. The results show that when the bottom water is sufficient, the bottom water energy can be used to drive oil, and the gas injection recovery factor of the bottom water sufficient reservoir is higher than that of the bottom water reservoir when the gas injection wheel times are the same, and three methods of pure gas injection, water gas alternating and water gas mixing injection are adopted in the experiment for the bottom water reservoir. The "loft oil" remaining in the upper part of a single well after the bottom water drive is difficult to be produced. Through gas injection, part of the remaining oil can be driven out, and the bottom water coning speed can be controlled. Finally, it is concluded that the gas injection mode is the best when the bottom water is sufficient. When the volume of oil is large, the effect of gas injection is more remarkable. The oil displacement experiment of fracture-cavity physical model is completed. The effects of nitrogen displacement, gas injection velocity, crude oil viscosity and gas injection mode on oil recovery are mainly studied. The results show that there are some residual oil in the fracture and cavity model after water flooding, which can improve the liquid flow condition and further increase the recovery factor after gas injection, and the choice of steam injection speed will affect the final recovery degree. There is an optimal injection rate, so that the gas can enter into the fracture and crude oil to fully mix without premature gas breakthrough, and at the same time, the effects of different injection modes of heterogeneous conditions on oil recovery are compared. The experimental results show that, Low permeability units can be produced by gas injection instead of oil in a fractured reservoir with serious heterogeneity.
【學(xué)位授予單位】：長(zhǎng)江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE357.7

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 劉鵬飛;姜漢橋;徐暉;胡慶賀;涂興萬(wàn);;縫洞型油藏開(kāi)發(fā)室內(nèi)模擬研究[J];石油鉆采工藝;2009年05期

，

本文編號(hào)：1796249