發(fā)布時間：2018-08-01 09:03

【摘要】：目前,國內(nèi)外已開發(fā)的油田縱向非均質(zhì)嚴重,注水開發(fā)過程中引發(fā)了諸多矛盾和問題,如層間干擾嚴重、儲量動用程度低、綜合采收率低等。在當今石油資源日益趨緊的形勢下,開展多層油藏水驅(qū)動態(tài)物理模擬實驗研究,對認識油藏滲流機理,分析層間差異對開采效果的影響,研究直井變密度射孔優(yōu)化技術(shù)的可行性具有重要意義。本文以勝利油田東辛油區(qū)五點法注采井網(wǎng)原型為背景,基于水驅(qū)油相似準則處理,進行了多層不均勻地層注水驅(qū)替物理模擬實驗:1.首先以滲流理論和相似理論為基礎(chǔ),利用檢驗分析法推導了水驅(qū)油的相似準則;然后利用量綱分析法檢驗了推導結(jié)果的正確性;最后以東辛油區(qū)為實例,根據(jù)地層原型參數(shù)和室內(nèi)能夠滿足的條件,換算了物理模擬所需的模型參數(shù)和操作參數(shù)。2.根據(jù)模型參數(shù)建立了多層物理模擬實驗裝置,利用操作參數(shù)開展了直井開采物理模擬實驗,實驗結(jié)果表明:(1)對于縱向非均質(zhì)性油藏,在開采過程中,注入水絕大部分進入高滲層,導致低滲層的水驅(qū)動用情況差,產(chǎn)液量低,整體儲量動用程度不均。與多層合采相比,分層開采的綜合產(chǎn)液量較大。(2)變密度射孔技術(shù)可降低縱向非均質(zhì)性對合層開采的不利影響,有效提高合采層段的產(chǎn)液量。3.利用COMSOL Multi-physics分別建立了均勻射孔和變密度射孔直井開采的水驅(qū)數(shù)值模型。通過分析模型的壓力分布情況,進一步證實了直井變密度射孔技術(shù)的可行性。數(shù)值模型和對應物理模型產(chǎn)液量的良好擬合,論證了相似性物理模擬方法的正確性。
[Abstract]:At present, the longitudinal heterogeneity of developed oilfields at home and abroad is serious, and many contradictions and problems have been caused in the process of water injection development, such as serious interlayer interference, low reserve utilization, low comprehensive recovery, and so on. Under the situation of increasingly tight petroleum resources, the physical simulation study of water drive performance in multi-layer reservoir is carried out, and the influence of layer difference on production effect is analyzed to understand reservoir percolation mechanism. It is of great significance to study the feasibility of variable density perforation optimization technology in straight wells. Based on the prototype of the five-point injection and production pattern in Dongxin oil area of Shengli Oilfield, and based on the similar criteria of water flooding, the physical simulation experiment of water flooding displacement in multi-layer heterogeneous formation is carried out in this paper. On the basis of seepage theory and similarity theory, the similarity criterion of water flooding is deduced by means of test analysis, and the correctness of the derived results is verified by dimensional analysis. According to the formation prototype parameters and the conditions that can be satisfied in the laboratory, the model parameters and operating parameters required for physical simulation are converted. According to the model parameters, the multi-layer physical simulation experiment device is established, and the physical simulation experiment of the vertical well production is carried out by using the operating parameters. The experimental results show that: (1) for the longitudinal heterogeneity reservoir, in the process of production, Most of the injected water enters the hypertonic layer, which leads to poor water driving, low liquid production and uneven utilization of the whole reserves. Compared with multilayer combined mining, the comprehensive liquid production of stratified mining is larger. (2) variable density perforation technology can reduce the adverse effect of longitudinal heterogeneity invading the mining, and effectively increase the liquid production of combined mining strata. The numerical models of water drive for uniform perforation and variable density perforation are established by COMSOL Multi-physics. By analyzing the pressure distribution of the model, the feasibility of variable density perforation in vertical wells is further confirmed. The good fitting between the numerical model and the corresponding physical model proves the correctness of the similarity physical simulation method.
【學位授予單位】：中國石油大學(華東)
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE357.6

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本文編號：2157072