發(fā)布時間：2018-05-26 06:20

  本文選題：大慶油田 + 匹配關系　； 參考：《東北石油大學》2017年碩士論文

【摘要】：在實際的油藏中,由于油層縱向或平面上的非均質性,水驅過程中容易出現(xiàn)注入水的突進和指進現(xiàn)象,造成注入井周圍不同方向的生產(chǎn)井受效不均勻,以及油層內部主流線和非主流線上對原油驅替的不均勻。聚合物等化學驅、化學劑調剖、調驅等技術可以大幅改善水驅效果,但仍然受油層非均質性的影響,這些方法應用后仍有大量剩余油在油層內呈不均勻狀態(tài)分布,即定黏度的驅油劑與非均質的油層之間的矛盾仍然沒有解決。論文采用恒速和恒壓兩種方法相結合的技術思路,將恒速注入計算出的阻力系數(shù)、殘余阻力系數(shù)與恒壓實驗中得出的注入速度三個參數(shù)相結合,制定了驅油劑與油層注入界限的判定標準,總結了相互的匹配關系,并給出了配伍關系圖版,得到了不同濃度,不同分子量聚合物與油藏匹配關系。之后在滲透率分別為100、300、500、700、900和1100×10-3μm2并聯(lián)的6支人造巖心上,進行了聚合物交替變滲流阻力體系提高采收率的室內實驗。通過對比不同交替方式和交替周期方案的分流率、采收率、含水率和壓力等參數(shù)的變化,考察適合該非均質情況的交替變滲流阻力注入方式。研究發(fā)現(xiàn),交替注入能夠增加低滲層吸液量,調整吸液剖面,有效抑制注聚合物過程中剖面返轉現(xiàn)象,從而改善非均質油層驅油效果,但交替周期存在一個最佳界限,就實驗模擬的非均質油層而言,交替周期在0.2PV時可獲得最佳驅油效果。對于交替注入的先后順序,發(fā)現(xiàn)高濃高分聚合物在前的方式好于低分或低濃在前的方式,進而優(yōu)選出了最佳聚合物交替變滲流阻力注入方式。通過含水、采收率、低滲層吸液比例等參數(shù)的對比說明,非均質情況下,交替周期段塞大小為0.2PV時,驅油效果好于交替周期為0.1PV和0.4PV的驅油方案;交替周期段塞大小為0.2PV時,驅油效果最好的交替順序為先高分、高濃,后高分、普濃的交替順序,注入量為2000PV·mg/L時聚驅采收率達到34.51%,最終采收率達到74.86%;高濃高分在前的交替順序,好于低分或低濃在前的交替注入順序。
[Abstract]:In the actual reservoir, due to the heterogeneity in the vertical or plane of the reservoir, it is easy to appear the phenomenon of injection water penetration and fingering in the process of water flooding, which results in the uneven effect of the production wells in different directions around the injection wells. And the inhomogeneous displacement of crude oil on the main and non-mainstream lines inside the reservoir. Chemical flooding, such as polymer flooding, profile control with chemical agents, flooding control and other techniques, can greatly improve the water drive effect, but it is still affected by reservoir heterogeneity. After the application of these methods, a large amount of remaining oil is still distributed unevenly in the reservoir. The contradiction between the constant viscosity flooding agent and the heterogeneous reservoir is still unresolved. In this paper, the method of constant velocity and constant pressure is used to combine the three parameters of constant velocity injection, residual resistance coefficient and constant pressure experiment. The criteria for determining the injection boundary between oil displacement agent and reservoir are established, and the matching relationship between oil displacement agent and reservoir is summarized. The matching relationship between different concentration and molecular weight polymer and reservoir is obtained. Then, an laboratory experiment was carried out on six artificial cores with permeability of 100300500700900 and 1100 脳 10 ~ (-3) 渭 m ~ (2) in parallel. By comparing the variation of the flow rate, recovery factor, water cut and pressure in different alternating modes and alternative periodic schemes, the alternative flow resistance injection mode suitable for the heterogeneous situation was investigated. It is found that alternating injection can increase the amount of liquid absorption in low permeability layer, adjust the absorption profile, and effectively suppress the phenomenon of section back shift in polymer injection process, thus improving the displacement effect of heterogeneous reservoirs, but there is an optimal limit of alternate cycle. For the heterogeneous reservoirs simulated experimentally, the best displacement effect can be obtained at 0.2PV. For the sequence of alternating injection, it is found that the way of high concentration and high content polymer is better than that of low score or low concentration, and the best alternative flow resistance injection mode of polymer is selected. The comparison of parameters such as water cut, oil recovery factor and liquid absorption ratio of low permeability layer shows that under heterogeneous condition, the displacement effect of alternating period slug with 0.2PV is better than that with alternate cycle of 0.1PV and 0.4PV, and with alternating period slug size of 0.2PV, the oil displacement effect is better than that of alternative cycle slug with 0.1PV and 0.4PV. The best alternating sequence of oil displacement effect is first high score, high concentration, later high score, common concentration alternating sequence. When the injection amount is 2000PV mg/L, the polymer flooding recovery factor reaches 34.51%, and the final recovery reaches 74.86%. Better than low score or low concentration at the front of the alternating injection sequence.
【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】：TE357.46
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本文編號：1936258