本文選題：井網(wǎng)重構(gòu) + 數(shù)值模擬　； 參考：《東北石油大學(xué)》2017年碩士論文

【摘要】：北一二排西水驅(qū)進入特高含水開發(fā)期,受自身平面非均質(zhì)性較強影響,原開發(fā)井網(wǎng)出現(xiàn)了剩余油高度分散、單砂體間注采井距不均衡、注采關(guān)系不完善等矛盾,導(dǎo)致地下油水分布總格局發(fā)生了重大變化,原井網(wǎng)適應(yīng)性顯著降低,迫切需要開展井網(wǎng)重構(gòu)研究。對北一二排西井網(wǎng)重構(gòu)前開發(fā)效果進行了評價。評價發(fā)現(xiàn)研究區(qū)目前產(chǎn)量遞減快,含水率高,含水上升快;控制程度和有效動用程度低;剩余油高度分散;單砂體間注采井距不均衡,注采關(guān)系不完善等問題。進行精細地質(zhì)建模與數(shù)值模擬。運用Petrel地質(zhì)建模軟件,建立了北一二排西精細地質(zhì)模型。運用Eclipse進行數(shù)值模擬,2015年8月后,剩余油主要分布在SII1-SII9和PII的薄差油層,需要通過“二三次井網(wǎng)重構(gòu)(互相完善注采關(guān)系)”挖潛。制定了以補孔、封堵和轉(zhuǎn)注三種措施為主的井網(wǎng)重構(gòu)方案。補孔方案包括143口油井,52口水井,1889個補孔點;封堵方案包括46口油井,16口水井,263個封堵點;轉(zhuǎn)注75口油井。從2015年8月開始進行井網(wǎng)重構(gòu),到2016年10月措施基本完成。目前,水驅(qū)井網(wǎng)有320口油井,247口注入井,其中包括112口注聚井和135口注水井。對井網(wǎng)重構(gòu)后開發(fā)效果進行了評價。(1)2015年進行井網(wǎng)重構(gòu)調(diào)整,水驅(qū)井網(wǎng)遞減速度減緩,累產(chǎn)油量增幅小幅提升;各油組年產(chǎn)液量下降速度有不同程度緩減,水驅(qū)井網(wǎng)各油組的累產(chǎn)液量增幅趨于平緩,總體處于上升趨勢。水驅(qū)井網(wǎng)遞減率由原來的0.0570降低到0.0529,各油組遞減率也有不同程度的降低。2016年10月全區(qū)含水率94.70%,較井網(wǎng)重構(gòu)前下降了1.49個百分點。同時有效抑制研究區(qū)各油組含水上升率增長,措施效果明顯。(2)考慮研究區(qū)井網(wǎng)井距、斷層斷點數(shù)據(jù)以及油水井所處沉積相,形成了一套連通庫的計算方法,建立了水驅(qū)井網(wǎng)及聚驅(qū)井網(wǎng)連通庫。運用連通庫數(shù)據(jù),根據(jù)水聚驅(qū)井網(wǎng)控制程度計算方法,確定了水聚驅(qū)井網(wǎng)50個小層控制程度。井網(wǎng)重構(gòu)后水驅(qū)井網(wǎng)控制程度由79.23%提高到85.77%,提高了6.54個百分點,控制程度由中等水平轉(zhuǎn)為好;聚驅(qū)井網(wǎng)重構(gòu)后控制程度由72.13%提高到75.90%,提高了3.77個百分點。(3)運用定義法和水驅(qū)曲線法對研究區(qū)水驅(qū)井網(wǎng)動用程度進行研究。井網(wǎng)重構(gòu)后動用程度由39.35%提高到43.57%,提高了4.22個百分點,井網(wǎng)重構(gòu)后動用程度水平差。根據(jù)當(dāng)前各油水井的生產(chǎn)制度,運用Eclipse數(shù)值模擬軟件,定液量生產(chǎn),進行中長期開發(fā)效果預(yù)測。油藏工程方法和數(shù)值模擬方法確定井網(wǎng)重構(gòu)后采收率為44.330%,比井網(wǎng)重構(gòu)前采收率增長0.585個百分點,達到預(yù)期調(diào)整效果。
[Abstract]:During the development period of the water flooding in the north and second rows of the west, due to the strong influence of its own plane heterogeneity, the original development well pattern appeared some contradictions, such as highly dispersed remaining oil, uneven injection-production interval between single sand bodies, imperfect injection-production relationship, etc. As a result, the total pattern of underground oil and water distribution has changed greatly, and the adaptability of the original well pattern has been significantly reduced, so it is urgent to carry out well pattern reconstruction research. The development effect of the well pattern before reconstruction was evaluated. The evaluation found that the production decline rapidly, the water cut is high, the water cut is rising rapidly in the research area, the degree of control and effective production is low, the remaining oil is highly dispersed, the injection-production well distance between single sand bodies is not balanced, the relationship between injection and production is not perfect, and so on. Fine geological modeling and numerical simulation are carried out. Using Petrel geological modeling software, the fine geological model of Bei Yi er Pai Xi is established. After August 2015, the remaining oil is mainly distributed in thin and differential oil layers of SII1-SII9 and PII, and needs to be tapped through "secondary and tertiary well pattern reconstruction (perfect injection-production relationship)". The reconstruction scheme of well pattern is established, which is based on three kinds of measures: filling hole, sealing and transferring injection. The plugging scheme includes 143 wells with 52 wells and 1889 filling points, 46 wells with 16 wells with 263 plugging points, and 75 wells with injection. The reconstruction of well pattern began in August 2015, and the measures were basically completed in October 2016. At present, there are 320 wells with 247 injection wells, including 112 polymer injection wells and 135 injection wells. The development effect after well pattern reconstruction was evaluated. (1) in 2015, the well pattern was adjusted, the decline rate of water drive well pattern was slowed down, the increment of cumulative oil production was increased slightly, and the decreasing rate of annual liquid production of each oil group was slowed down in varying degrees. The increasing rate of cumulative liquid production of each oil group in water drive well pattern tends to be gentle, and it is on the rise as a whole. The decline rate of water drive well pattern is reduced from 0.0570 to 0.0529, and the decline rate of each oil group is also decreased to some extent. In October 2016, the water cut in the whole area is 94.70%, which is 1.49% lower than that before well pattern reconstruction. At the same time, the increase of water cut rate of each oil group in the study area is effectively restrained, and the effect of the measures is obvious. (2) considering well spacing, fault fracture point data and sedimentary facies of oil and water wells in the study area, a set of calculation method of connected reservoir is formed. The water drive well network and the polymer flooding network connection library are established. Based on the data of the connected database and the calculation method of the control degree of the water flooding well pattern, the control degree of 50 small layers in the water polymer flooding well network is determined. After well pattern reconstruction, the control degree of water drive well pattern is increased from 79.23% to 85.77%, which is increased by 6.54%, and the control degree is changed from medium level to good level. The control degree of polymer flooding pattern was increased from 72.13% to 75.90%, which increased 3.77%. (3) using definition method and water drive curve method, the production degree of water drive well pattern in the study area was studied. After well pattern reconstruction, the production degree is raised from 39.35% to 43.57%, which is increased by 4.22%, and the production level is poor after well pattern reconstruction. According to the current production system of oil and water wells, using Eclipse numerical simulation software, the production of liquid quantity is determined, and the medium and long term development effect is predicted. Reservoir engineering methods and numerical simulation methods determine that the recovery factor after well pattern reconstruction is 44.330%, which is 0.585% higher than that before well pattern reconstruction, and achieves the expected adjustment effect.
【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】：TE324

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