本文關(guān)鍵詞：薩中油田薩葡油層密井網(wǎng)下合理流壓研究　出處：《東北石油大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 合理流壓 流入動態(tài)曲線 采油速度 注入壓力 泵效

【摘要】：目前,薩中開發(fā)區(qū)水驅(qū)薩葡油層由基礎(chǔ)井網(wǎng)發(fā)展到一、二、三次加密調(diào)整井網(wǎng),隨著各個區(qū)塊加密井網(wǎng)的設(shè)計部署,層系重組,井網(wǎng)重構(gòu),注采井距縮小,開發(fā)條件發(fā)生重大變化,油田的開發(fā)難度越來越大。水驅(qū)含水上升率和三次采油效果控制難度加大,傳統(tǒng)的合理流壓界限確定方法已經(jīng)不適應(yīng)目前油田的開發(fā)條件。因此,開展不同類型油層、不同井距、不同含水率條件下的水驅(qū)合理流壓界限研究,確定油井合理流壓,是目前油田急需解決的開發(fā)難題。本文應(yīng)用油藏工程方法和數(shù)值模擬方法,考慮地層最大供液、泵下入深度、泵效、最大注入壓力等因素,確定出薩葡油層密井網(wǎng)條件下流壓下限,考慮采油速度確定出流壓上限,給出了保持地層壓力(原始地層壓力、飽和壓力、地飽壓差-1MPa)、地層壓力下降(總注采比0.7、0.8、0.9)6種不同壓力水平下,流壓隨井距和含水變化規(guī)律。研究表明,不同井距(106m、125m、150m、175m)、不同含水率階段的水驅(qū)油井合理流壓界限確定方法及變化規(guī)律。相同流壓條件時,注入壓力隨著含水率的升高而升高,采油速度隨著含水率的升高而降低;相同含水率的情況下,注入壓力隨生產(chǎn)井井底流壓的升高而降低,采油速度隨生產(chǎn)井井底流壓的升高而降低。由保持地層壓力的三種情況可以看出,在保持不同的壓力水平下,保持地層壓力越高,流壓的上限越高,流壓的下限也越高;地層壓力持續(xù)下降的三種情況下,總注采比越小,地層虧空越大,流壓的上限越低,流壓的下限越低。合理流壓隨含水率增加而增大,隨井距增大而減小。相同井距條件下,合理流壓隨含水率增加而增大,隨地層壓力的升高而增大�；诖_定的流壓界限,通過回歸分析,建立了考慮井距、含水率的水驅(qū)合理流壓界限計算模型,并結(jié)合現(xiàn)場實際,為下一步流壓的調(diào)整提供了依據(jù)。
[Abstract]:At present, the water drive oil reservoir in Sazhong Development Zone has developed from the basic well pattern to the first, second and third infill adjustment well pattern. With the design and deployment of the infill well pattern in each block, the layer system reorganization, the well pattern reconstruction, the injection-production well spacing is reduced. The development conditions have changed greatly, the development of oil fields is becoming more and more difficult, and the water cut rise rate of water flooding and the control of tertiary oil recovery are becoming more difficult. The traditional method of determining reasonable flow pressure limits is not suitable for the current oilfield development conditions. Therefore, the study on the reasonable flow pressure limits of water drive under different types of oil layers, different well spacing and different water cut is carried out. It is an urgent problem to determine the reasonable flow pressure of oil well. In this paper, the reservoir engineering method and numerical simulation method are used to consider the factors such as the maximum liquid supply, the depth of the pump, the efficiency of the pump, the maximum injection pressure and so on. The lower limit of flow pressure is determined under the condition of dense well pattern in Sapu reservoir, and the upper limit of flow pressure is determined by considering the oil recovery speed, and the maintenance formation pressure (original formation pressure, saturation pressure, ground saturation pressure difference-1MPa) is given. The flow pressure changes with well spacing and water cut at 6 different pressure levels (the total injection-production ratio is 0.7m 0.80.90%). The results show that the flow pressure varies from 106mm to 125m at different intervals. The reasonable flow pressure limit of water flooding wells at different water cut stages is determined and its variation law is determined. Under the same flow pressure conditions, the injection pressure increases with the increase of water cut. The oil recovery rate decreases with the increase of water cut. Under the condition of the same water cut, the injection pressure decreases with the increase of the bottom flow pressure of the production well, and the oil recovery rate decreases with the increase of the bottom flow pressure of the production well, which can be seen from the three conditions of maintaining the formation pressure. Under different pressure levels, the higher the formation pressure, the higher the upper limit of flow pressure and the higher the lower limit of flow pressure. The lower the total injection-production ratio, the greater the formation deficit, the lower the upper limit of flow pressure and the lower the lower limit of flow pressure. The reasonable flow pressure increases with the increase of water content. Under the same well spacing, the reasonable flow pressure increases with the increase of water cut, and increases with the increase of anywhere pressure. Based on the determined boundary of flow pressure, the well spacing is considered by regression analysis. The reasonable flow pressure limit calculation model of water flooding, combined with the field practice, provides the basis for the adjustment of the flow pressure in the next step.
【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】：2015
【分類號】：TE324

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本文編號：1390975