S-1区同井注采试验与效果评价

发布时间：2018-04-25 17:11

本文选题：同井注采 + 数值模拟　；参考：《东北石油大学》2017年硕士论文

【摘要】：随生产井含水不断增高,举升能耗及水处理费用逐渐增加。当达到经济极限时,就需要关井停产,影响油田产量。同井注采技术可实现在井下对产出液进行油水分离。分离出的水经注入泵回注到油层,而含油较高的油水混合物经采出泵被举升至地面。因此,从油藏工程角度,有必要进行同井注采技术试验效果分析与评价研究。首先,本文建立了试验区150个沉积单元的沉积相模型以及属性模型。试验区实际地质储量为5030.06×104t,地质建模法得到地质储量为5169.69×104t,拟合误差为2.78%。对试验区全区以及524口单井的动态开发指标进行拟合,得到了试验区各层剩余油饱和度分布场,分析了各层剩余油储量及采出程度等开发指标,其中萨尔图油层剩余地质储量最大,为1323.67×104t,葡萄花油层剩余地质储量最小,为465.30×104t。因此,在进行同井注采技术方案设计时,同井注采的方式选择为采下注上,即采高台子油层,回注萨、葡油层。其次,同井注采试验井井号确定为S-1区中西块N1等17口井,同井注采方式选择为采下注上,即采高台子油层,回注萨、葡二组油层。初期开发效果表明,试验区累积产油量增加62.01×104t,采出程度增加1.23%。试验井含水率降低,周边周边受效井产油量增加明显。最后,对S-1区同井注采试验效果进行了短期及长期的预测。短期预测结果表明,试验期内全区累积产油量141.86×104t,采收率提高2.99%。单井长期预测结果表明,由水驱经济极限含水率生产至同井注采经济极限含水率,油价为40$/bbl,△R=3.16%;油价为50$/bbl,△R=4.45%;油价为60$/bbl,△R=5.53%,油价越高,同井注采单井开发潜力越大。全区长期预测结果表明,实施同井注采技术前后全区采收率分别为44.73%、57.34%,截至全区含水率达到同井注采经济极限含水率99.48%,全区采收率提高12.61个百分点。综上所述,同井注采技术在降低含水率以及提高采收率方面都显示出了良好的优越性,在现场试验过程中取得了较好的开发效果,具有良好的应用前景。
[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.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE355

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