本文選題：剩余油分布 + 系統(tǒng)調(diào)整��； 參考：《東北石油大學(xué)》2017年碩士論文

【摘要】：目前薩南開發(fā)區(qū)已全面進(jìn)入高含水開發(fā)后期,一類油層大部分已進(jìn)行三次采油開發(fā),聚驅(qū)產(chǎn)量逐漸下降、水驅(qū)增儲潛力越來越小、原油穩(wěn)產(chǎn)的潛力主要集中在以二、三類油層為主的薄差層。大慶薩爾圖油田南七區(qū)基礎(chǔ)井網(wǎng)1965年投入開發(fā),1985年進(jìn)行了一次加密調(diào)整,1996年進(jìn)行了二次加密調(diào)整,二次加密調(diào)整后區(qū)塊可采儲量增加,保持了區(qū)塊穩(wěn)產(chǎn),改善了薄差油層的動用狀況,初期取得了較好的開發(fā)效果。隨著開采時間的延長,二次加密調(diào)整井含水上升速度加快,產(chǎn)量遞減幅度大,壓力系統(tǒng)不合理,注水方式不適應(yīng)的矛盾日益突出。2000年二次加密調(diào)整井實(shí)施注采系統(tǒng)調(diào)整,采油井轉(zhuǎn)注11口。2002年進(jìn)行了三次加密調(diào)整。2011年為進(jìn)一步改善區(qū)塊開發(fā)效果,提高區(qū)塊最終采收率,本文結(jié)合區(qū)塊開發(fā)實(shí)際,在對區(qū)塊剩余油成因及分布的基礎(chǔ)上進(jìn)行剩余油挖潛對策研究,對該區(qū)注采適應(yīng)狀況變差的井區(qū)繼續(xù)開展注采系統(tǒng)調(diào)整工作,其研究成果為高含水期水驅(qū)油田穩(wěn)產(chǎn)供理論依據(jù),對于突破高含水期油層剩余油挖潛具有舉足輕重的實(shí)踐意義和現(xiàn)實(shí)借鑒價值。本文選取的研究對象是大慶薩爾圖油田南部南七區(qū)二次加密及三次加密為對象以鉆井、測井、取芯、等靜態(tài)數(shù)據(jù)為基礎(chǔ)建立剩余油模型,以吸水產(chǎn)液剖面、生產(chǎn)測井為衡量評價目前儲層狀態(tài),以動態(tài)資料及套管狀態(tài)進(jìn)行單井挖潛研究。充分運(yùn)用數(shù)值模擬注采關(guān)系評價方法,深化區(qū)塊剩余油認(rèn)識,借助前人研究理論、方法及成果,來構(gòu)建南七區(qū)剩余油挖潛框架,總結(jié)區(qū)塊剩余油分布特征及挖潛方向,綜合評價區(qū)塊剩余油水平。通過研究取得了如下結(jié)論和認(rèn)識:1.將南七區(qū)主力油層薩、葡、高Ⅰ油層細(xì)分成110個沉積單元,建立了精細(xì)沉積格架。對主要7種沉積類型中井網(wǎng)控制的5種沉積類型進(jìn)行研究,完成了區(qū)塊的沉積相剖面圖,為后續(xù)研究奠定了基礎(chǔ)。2.將南七區(qū)部開采層位主要為薩至高Ⅰ共5個油層組,共統(tǒng)計(jì)108個小層。以小層作為模擬單元,模型縱向上劃分為108個模擬單元,利用Petrel軟件,將網(wǎng)格屬性(孔隙度、滲透率、有效厚度)進(jìn)行相控插值,得到的結(jié)果能夠真實(shí)反映地層的變化趨勢,為精細(xì)落實(shí)沉積體范圍及剩余油分布奠定了基礎(chǔ)。3.通過利用歷年來油、水井的措施資料以及吸水產(chǎn)液剖面資料進(jìn)行反復(fù)擬合,擬合地質(zhì)儲量為2891.473萬噸,相對誤差為0.28%,精度較高,為剩余油挖潛可行性提供基礎(chǔ)。4.理論研究結(jié)果:注采井距過大,注水井啟動壓力越高,則不利于滲透率水平較低的薄差油層動用,因此確定在不進(jìn)行加密調(diào)整的情況下,將區(qū)塊的東西向相同井網(wǎng)注采井距調(diào)整為250m,南北方向二三次井網(wǎng)綜合利用縮小注采井距為125m,構(gòu)成五點(diǎn)法面積井網(wǎng)。5.研究表明平面上薄而穩(wěn)定型三角洲砂體剩余油分布相對集中,是試驗(yàn)區(qū)區(qū)塊調(diào)整挖潛的主要對象;縱向上剩余油分布在薩II組及薩III組中占區(qū)塊剩余油的60%以上。6.研究表明該區(qū)塊剩余油類型主要以油層動用差和注采不完善為主,這部分占剩余油砂巖厚度32.38%、有效42.50%,是該區(qū)塊調(diào)整挖潛的主要對象。7.剩余油形成成因:葡差油層主要是由于縱向開發(fā)井段長,層間矛盾突出,下部油層動用差而形成的剩余油為主,在局部地區(qū)也存在一部分注采不完善型剩余油;薩差油層由于平面上注水井點(diǎn)少,注采關(guān)系不完善而形成剩余油。8.通過以細(xì)分層注水、精細(xì)堵水、補(bǔ)孔等相結(jié)合的方法完善單砂體注采關(guān)系,進(jìn)而使得非主力油層的動用狀況也得到明顯改善,提高水驅(qū)控制程度,有效挖掘剩余油潛力,最終采收率有所提高,實(shí)現(xiàn)油田的可持續(xù)發(fā)展。
[Abstract]:At present, the southern development area of South China has fully entered the late stage of high water cut development. Most of the oil layers have been developed for three times. The output of polymer flooding is gradually decreasing and the potential of water flooding is becoming smaller and smaller. The potential of crude oil production is mainly concentrated in the thin layer with two and three types of oil. The basic well network in the South seven District of Daqing Saertu oilfield was developed in 1965. In 1985, an encryption adjustment was carried out, two encryption adjustment was carried out in 1996, the recoverable reserves of the block were increased after the two encryption adjustment, the stable production of the block was maintained, the moving status of the thin oil layer was improved, and the development effect was better in the early stage. With the extension of the mining time, the water cut rate of the two encrypted adjustment wells was accelerated and the output decreased. Large amplitude, unreasonable pressure system and incompatibility of water injection mode, the two time encryption adjustment well was adjusted in.2000 year, and three times of encryption adjustment for 11.2002 years was carried out for.2011 years to further improve block development effect and improve the final recovery of block. On the basis of the cause and distribution of residual oil, the Countermeasures of remaining oil digging are carried out, and the adjustment work of injection production system is continued to be carried out in well area with poor adaptability in this area. The research results provide theoretical basis for stable production of water flooding oil field in high water cut period, and have important practical significance and present significance for breaking through the remaining oil in high water cut stage. The object of this study is to establish the remaining oil model on the basis of two encryption and three encryption in the South South seven area of southern Daqing oil field, based on the static data such as drilling, logging, core extraction and other static data. The reservoir is measured by the water absorption section, and the production logging is used to evaluate the current reservoir state, and the single well is carried out with dynamic data and casing state. In order to make full use of the evaluation method of numerical simulation injection and production relations, deepen the understanding of the remaining oil in the block, build the remaining oil digging framework in the South seven area with the help of previous research theories, methods and achievements, sum up the distribution characteristics of the remaining oil in the block and the direction of potential digging, and comprehensively evaluate the remaining oil level in the block. The following conclusions and knowledge are obtained through the study: 1. The fine sedimentary framework was established by subdividing the main oil layer of the main oil layer in the South seven area into 110 sedimentary units. The 5 sedimentary types of the main 7 types of sedimentary types were studied, and the sedimentary facies profile of the block was completed, which laid the foundation for the follow-up study by.2., the main mining beds in the South seven areas were mainly 5 of the height of Sooi. There are 108 small layers in the reservoir. The small layer is used as a simulation unit, and the model is divided into 108 simulation units vertically. Using the Petrel software, the grid attributes (porosity, permeability and effective thickness) are interpolated by phase control. The results can truly reflect the trend of formation change, and lay the foundation for the fine implementation of the range of sedimentary bodies and the distribution of remaining oil. Based on the repeated fitting of the past year's oil, water well measures and water absorption profile data, the foundation.3. fits the geological reserves of 28 million 914 thousand and 730 tons, the relative error is 0.28% and the precision is high, which provides the basic.4. theory research results for the feasibility of the remaining oil digging potential: the higher injection production well distance and the higher starting pressure of the injection well are not favorable. The thin oil layer with low permeability is used. Therefore, it is determined that the well spacing of the block is adjusted to 250m with the same well net injection well spacing in the case of no encryption adjustment, and the two or three well network in the north-south direction is 125m, and the five point method of area well network.5. research shows thin and stable delta sand body on the plane. The remaining oil distribution is relatively concentrated, which is the main object of adjusting and digging potential in the test area. The longitudinal residual oil distribution in the II group and the saaa III group accounts for more than 60%.6. of the remaining oil in the block, which shows that the main types of remaining oil in the block are mainly used in the oil formation and injection production, which accounts for 32.38% of the remaining oil sandstone and 42.50% of the remaining oil. The main object of.7. remaining oil formation in this area is the formation of the remaining oil, which is mainly due to the lengthwise development of the well section long, the interlayer contradiction is prominent, the remaining oil is mainly formed in the lower oil layer, and a part of the incomplete injection and production remaining oil is found in the local area, and the injection production relation is not related to the water injection well point on the plane. In order to improve the formation of residual oil.8., the injection production relationship of single sand body is improved by means of subdivision layer water injection, fine water plugging and hole filling, which can improve the dynamic use of non main oil layers, improve the control degree of water flooding, effectively excavate the potential of residual oil, improve the final recovery rate, and realize the sustainable development of the oil field.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE327
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本文編號：1952064