發(fā)布時間：2018-04-25 17:11

  本文選題：同井注采 + 數(shù)值模擬��； 參考：《東北石油大學》2017年碩士論文

【摘要】：隨生產(chǎn)井含水不斷增高,舉升能耗及水處理費用逐漸增加。當達到經(jīng)濟極限時,就需要關(guān)井停產(chǎn),影響油田產(chǎn)量。同井注采技術(shù)可實現(xiàn)在井下對產(chǎn)出液進行油水分離。分離出的水經(jīng)注入泵回注到油層,而含油較高的油水混合物經(jīng)采出泵被舉升至地面。因此,從油藏工程角度,有必要進行同井注采技術(shù)試驗效果分析與評價研究。首先,本文建立了試驗區(qū)150個沉積單元的沉積相模型以及屬性模型。試驗區(qū)實際地質(zhì)儲量為5030.06×104t,地質(zhì)建模法得到地質(zhì)儲量為5169.69×104t,擬合誤差為2.78%。對試驗區(qū)全區(qū)以及524口單井的動態(tài)開發(fā)指標進行擬合,得到了試驗區(qū)各層剩余油飽和度分布場,分析了各層剩余油儲量及采出程度等開發(fā)指標,其中薩爾圖油層剩余地質(zhì)儲量最大,為1323.67×104t,葡萄花油層剩余地質(zhì)儲量最小,為465.30×104t。因此,在進行同井注采技術(shù)方案設(shè)計時,同井注采的方式選擇為采下注上,即采高臺子油層,回注薩、葡油層。其次,同井注采試驗井井號確定為S-1區(qū)中西塊N1等17口井,同井注采方式選擇為采下注上,即采高臺子油層,回注薩、葡二組油層。初期開發(fā)效果表明,試驗區(qū)累積產(chǎn)油量增加62.01×104t,采出程度增加1.23%。試驗井含水率降低,周邊周邊受效井產(chǎn)油量增加明顯。最后,對S-1區(qū)同井注采試驗效果進行了短期及長期的預(yù)測。短期預(yù)測結(jié)果表明,試驗期內(nèi)全區(qū)累積產(chǎn)油量141.86×104t,采收率提高2.99%。單井長期預(yù)測結(jié)果表明,由水驅(qū)經(jīng)濟極限含水率生產(chǎn)至同井注采經(jīng)濟極限含水率,油價為40$/bbl,△R=3.16%;油價為50$/bbl,△R=4.45%;油價為60$/bbl,△R=5.53%,油價越高,同井注采單井開發(fā)潛力越大。全區(qū)長期預(yù)測結(jié)果表明,實施同井注采技術(shù)前后全區(qū)采收率分別為44.73%、57.34%,截至全區(qū)含水率達到同井注采經(jīng)濟極限含水率99.48%,全區(qū)采收率提高12.61個百分點。綜上所述,同井注采技術(shù)在降低含水率以及提高采收率方面都顯示出了良好的優(yōu)越性,在現(xiàn)場試驗過程中取得了較好的開發(fā)效果,具有良好的應(yīng)用前景。
[Abstract]:With increasing water cut in production wells, lift energy consumption and water treatment cost increase gradually. When the economic limit is reached, it is necessary to shut down the well and affect the oil production. The same well injection and production technology can realize oil-water separation in downhole. The separated water is pumped back into the reservoir, and the oil-water mixture with higher oil content is lifted to the ground by the pump. Therefore, from the point of reservoir engineering, it is necessary to analyze and evaluate the experimental effect of injection and production technology in the same well. Firstly, the sedimentary facies model and attribute model of 150 sedimentary units in the experimental area are established. The actual geological reserves of the test area are 5030.06 脳 10 ~ (4) t, the geological reserves obtained by the geological modeling method are 5169.69 脳 10 ~ (4) t, and the fitting error is 2.78 t. By fitting the dynamic development indexes of the whole area and 524 single wells in the test area, the distribution field of remaining oil saturation in each layer of the test area is obtained, and the remaining oil reserves and recovery degree of each layer are analyzed. The remaining geological reserves of Saartu reservoir are the largest, which is 1323.67 脳 10 ~ 4t, and the remaining geological reserves of grape flower oil reservoir is the smallest, 465.30 脳 10 ~ 4t. Therefore, in the design of the technical scheme of injection and production in the same well, the way of injection and production in the same well is selected as the following: the production is high in Taizi reservoir, the reservoir is injected back to sa, and the oil reservoir is produced in the same well. Secondly, the number of injection and production test well in the same well is determined to be 17 wells, such as N1 and so on, in S-1 block. The injection and production mode of the same well is selected as the production up, that is, the reservoir is high, the reservoir is injected back to sa, and the second group of Portugal is selected. The initial development effect showed that the cumulative oil production increased 62.01 脳 10 ~ (4) t and the recovery degree increased 1.23% in the experimental area. The water cut of the test well decreases and the oil production of the peripheral effective well increases obviously. Finally, the short-term and long-term prediction of the effect of injection-production test in S-1 area is carried out. The short-term prediction results show that the cumulative oil production in the whole area is 141.86 脳 10 ~ (4) t and the oil recovery is increased by 2.99% during the test period. The long-term prediction results of single well show that from the production of water drive economic limit water cut to the economic limit water cut of the same well injection and production, the oil price is 40 / b / b, R = 3.16; the oil price is 50 / b / b, R = 4.45; the oil price is 60% / b / b, R = 5.53; the higher the oil price is, the greater the development potential of the single well in the same well is. The long-term prediction results show that the oil recovery is 44.73 and 57.34 before and after the implementation of the same well injection and production technology. By the end of the whole region, the water cut has reached the economic limit water cut of the same well, and the oil recovery in the whole area has increased by 12.61 percentage points. To sum up, the technology of injection and production in the same well shows good superiority in reducing water cut and increasing oil recovery, and has a good development effect in the field test process, and has a good application prospect.
【學位授予單位】：東北石油大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TE355

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