本文選題：一類油層 + 聚驅(qū)　； 參考：《東北石油大學(xué)》2017年碩士論文

【摘要】：南七-杏一區(qū)東部一類油層地區(qū)葡Ⅰ組河道砂體規(guī)模變小、儲層條件變差,水驅(qū)階段綜合含水、采出程度及水淹厚度比例高。注聚以來存在三方面問題:一是見效慢,見效不均衡,見效比例低;二是粘損高,高回壓高沉沒度井比例大;三是部分井區(qū)壓力梯度低,流壓水平高,不利用擴(kuò)大波及體積,影響區(qū)塊聚驅(qū)開發(fā)效果。由于注采壓力梯度與聚驅(qū)開發(fā)效果緊密相關(guān),如何構(gòu)建一個(gè)合理的聚驅(qū)壓力梯度,顯得尤為重要。本文為搞清聚驅(qū)開發(fā)過程中地層壓力影響因素及變化特征,建立精細(xì)三維地質(zhì)模型,應(yīng)用數(shù)值模擬軟件開展歷史擬合,研究地層壓力與聚合物溶液濃粘度、注入強(qiáng)度、注入速度、注采比、采出井流壓、沉沒度、采液強(qiáng)度等多參數(shù)之間關(guān)系,并歸納總結(jié)不同階段地層壓力變化特征,最后建立地層壓力預(yù)測模型。同時(shí)研究了不同驅(qū)替階段油井流入動(dòng)態(tài)的數(shù)學(xué)模型,建立不同階段合理的流壓界限。聚合物驅(qū)油井流入動(dòng)態(tài)是分析油井生產(chǎn)狀態(tài)的基礎(chǔ),是合理設(shè)計(jì)舉升方式及生產(chǎn)制度的關(guān)鍵。在聚合物驅(qū)油過程中,含聚合物的油井產(chǎn)出液表現(xiàn)出明顯的非牛頓特性,因剪切、降解等作用,使得地層流體的流變性發(fā)生較大變化。因此,常規(guī)的水驅(qū)油井流入動(dòng)態(tài)模型不能用于確定該類井的流入動(dòng)態(tài)關(guān)系。國內(nèi)外關(guān)于聚合物驅(qū)機(jī)采井合理流壓的研究較少,聚驅(qū)采出液呈現(xiàn)擬塑性,流體性質(zhì)受含聚濃度、含水率影響較大,結(jié)合聚合物驅(qū)不同階段流體的流變特性,在保證油井產(chǎn)量最大化的前提下,研究高、低流壓對提高采收率的影響程度,從而確定出不同階段最佳合理流壓界限。注聚初期4.5~6MPa,含水下降期3.4~4.5MPa,含水回升期4~5.5MPa。通過研究分類井組注采參數(shù)與注采壓差之間的關(guān)系,在最大采收率目標(biāo)下,明確不同聚驅(qū)階段合理壓力梯度界限范圍,以及達(dá)到合理壓力梯度界限范圍所要求的注采參數(shù),進(jìn)而優(yōu)化指導(dǎo)注入井參數(shù)調(diào)整及適當(dāng)放大采出井工作參數(shù),提高地層存聚率,擴(kuò)大聚合物在油層中的波及體積。研究成果為區(qū)塊下一步調(diào)整指明方向,改善了聚驅(qū)效果,同時(shí)也為其它聚驅(qū)區(qū)塊開發(fā)調(diào)整提供參考依據(jù)。
[Abstract]:The scale of the river channel sand body in the first class oil reservoir of the Pu-1 formation in the eastern part of Nanqi-Xingyi area has become smaller, the reservoir conditions have become worse, the water cut in the water drive stage is comprehensive, the degree of recovery and the ratio of water flooding thickness are high. There are three problems since polymer injection: first, slow effect, uneven effect and low effective ratio; second, high viscosity loss, high return pressure, high submergence ratio; third, low pressure gradient and high flow pressure level in some well areas, without the use of expanded sweep volume. It affects the development effect of block polymer flooding. Because the injection-production pressure gradient is closely related to the development effect of polymer flooding, how to construct a reasonable pressure gradient of polymer flooding is particularly important. In order to understand the influence factors and variation characteristics of formation pressure during polymer flooding development, a fine three-dimensional geological model is established, and historical fitting is carried out by using numerical simulation software to study the thick viscosity and injection strength of formation pressure and polymer solution. The relationship between injection velocity, injection-production ratio, well fluid pressure, submergence degree, fluid recovery intensity and so on is discussed, and the characteristics of formation pressure variation in different stages are summarized. Finally, the prediction model of formation pressure is established. At the same time, the mathematical models of oil well inflow performance in different displacement stages are studied, and the reasonable flow pressure limits in different stages are established. The inflow performance of polymer flooding oil wells is the basis for analyzing the production state of oil wells and the key to reasonable design of lift mode and production system. In the process of polymer flooding, the oil well production fluid containing polymer has obvious non-Newtonian characteristics. Due to the effects of shearing and degradation, the rheology of formation fluid changes greatly. Therefore, the conventional inflow performance model can not be used to determine the inflow performance of this kind of wells. There is little research on reasonable flow pressure in polymer flooding production wells at home and abroad. Polymer flooding production fluid presents pseudoplasticity, fluid properties are greatly affected by concentration of polymer and water cut, combined with rheological characteristics of fluids in different stages of polymer flooding. On the premise of maximization of oil well production, the influence of high and low flow pressure on oil recovery is studied, and the optimum reasonable flow pressure limit at different stages is determined. In the early stage of polymer injection, 4.5m ~ 6 MPa, 3.4 ~ 4.5MPa, 4.5MPa, 45.5MPa, respectively. By studying the relationship between injection-production parameters and injection-production pressure difference of classified well groups, under the maximum recovery target, the reasonable limit range of pressure gradient in different stages of polymer flooding and the injection-production parameters required to reach the limit range of reasonable pressure gradient are determined. Then the parameters of injection wells are adjusted and the working parameters of production wells are appropriately enlarged to improve the formation accumulation rate and to expand the sweep volume of polymer in the reservoir. The research results show the direction of block next adjustment, improve the effect of polymer flooding, and also provide a reference for the development and adjustment of other polymer flooding blocks.
【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】：TE357.46
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本文編號：1798089