本文選題：蒙古林油田　切入點(diǎn)：弱凝膠調(diào)驅(qū)　出處：《成都理工大學(xué)》2015年碩士論文

【摘要】：弱凝膠調(diào)驅(qū)技術(shù)可以提高注水開發(fā)效果,近年來在油田獲得了廣泛應(yīng)用。蒙古林砂巖油藏于1989年10月投入開發(fā),到2002年12月底,累積產(chǎn)油258.14×104t,綜合含水為92.90%。自2002年5月開始,油田采用弱凝膠調(diào)驅(qū)來提高采收率,直至08年10月完成調(diào)驅(qū)。調(diào)驅(qū)后,采出程度僅增加3.26%,剩余可采儲(chǔ)量189.52×104t,區(qū)塊仍有大量剩余油存在,具有進(jìn)一步改善水驅(qū)開發(fā)效果的潛力。因而,在室內(nèi)試驗(yàn)的基礎(chǔ)上,利用數(shù)值模擬手段,對(duì)比研究調(diào)驅(qū)前后縱向及平面剩余油分布特征,并結(jié)合地質(zhì)特征及油田開發(fā)實(shí)際,提出進(jìn)一步改善水驅(qū)開發(fā)效果的方案,以提高最終采收率。弱凝膠調(diào)驅(qū)室內(nèi)試驗(yàn)結(jié)果表明,弱凝膠對(duì)單個(gè)油層的封堵能力隨油層滲透率增大而減小,當(dāng)滲透率小于20×10-3μm2時(shí),對(duì)油層的封堵能力達(dá)到了98%以上;隨著滲透率級(jí)差增大,弱凝膠對(duì)高滲層封堵能力增大,對(duì)低滲層封堵能力減小,當(dāng)滲透率級(jí)差大于4.3時(shí),低滲管分液量大于高滲管分液量;弱凝膠對(duì)油相有一定程度的封堵,但封堵能力遠(yuǎn)小于對(duì)水相的封堵能力,當(dāng)水驅(qū)至30PV時(shí),水相封堵率下降;隨著膠體老化,弱凝膠封堵性能降低,當(dāng)老化時(shí)間大于80d時(shí),弱凝膠封堵率下降明顯�？v向及平面剩余油及剩余油分布特征研究表明,調(diào)驅(qū)后總體上吸水剖面得到改善,這也與室內(nèi)試驗(yàn)得出的結(jié)論一致,但改善效果不明顯。也正因?yàn)槿绱?才有很多剩余油且分布不均,使調(diào)驅(qū)后有改善水驅(qū)開發(fā)效果的改善條件及潛力。T1ys1-1小層剩余地質(zhì)儲(chǔ)量相對(duì)較少,為82.89×104t,且目前含水率高,為90.22%,不是進(jìn)一步水驅(qū)開發(fā)的主力層;T1ys1-2-1小層剩余地質(zhì)儲(chǔ)量略高于T1ys1-1小層,為95.15×104t,但目前含水率低,為81.64%,可考慮作為進(jìn)一步開發(fā)的主力層;T1ys1-2-2小層及T1ys2-1小層剩余地質(zhì)儲(chǔ)量較多,分別為176.70×104t及251.21×104t,且含水率不高,分別為91.18%及91.97%,是進(jìn)一步開采的主力層;T1ys2-2小層及T1ys2-3小層剩余地質(zhì)儲(chǔ)量最多,分別為251.21×104t及278.81×104t,但含水率較高,分別為94.82%及95.46%,要在控制含水上升率的情況下進(jìn)一步開采。平面上剩余油主要分布在小斷層遮擋帶附近、局部構(gòu)造高部位、南部邊部及井網(wǎng)未受控制區(qū)。預(yù)測(cè)結(jié)果表明,周期注水與完善井網(wǎng)增油效果較好,為此將周期注水與完善井網(wǎng)疊加后形成綜合開發(fā)方案,進(jìn)一步研究對(duì)全區(qū)最終采收率及水驅(qū)開發(fā)效果的影響。預(yù)測(cè)結(jié)果表明,到2054年9月21日綜合含水上升到98%時(shí),全區(qū)累積注水5599.45×104m3、累積產(chǎn)油489.22×104t、最終采收率33.65%。2014年5月27日到2054年9月21日期間,全區(qū)階段注水2574.31×104m3、階段產(chǎn)油108.44×104t、階段采出程度7.46%、階段含水上升率1.00%、階段平均綜合遞減率6.40%、階段平均自然遞減率6.40%。與2013年相比,階段平均綜合遞減率下降3.63個(gè)百分點(diǎn),階段平均自然遞減率下降8.14個(gè)百分點(diǎn)。與未進(jìn)行綜合開發(fā)相比,累積注水量增加979.81×104m3、增油71.82×104t、最終采收率增加4.94%。
[Abstract]:Weak gel control flooding technology can improve the effect of water injection development and has been widely used in oil fields in recent years.The Mongolian sandstone reservoir was put into development in October 1989, and by the end of December 2002, the cumulative oil production was 258.14 脳 10 ~ 4 t, and the comprehensive water cut was 92.90 t.Since May 2002, weak gel flooding has been used to improve oil recovery, until October 2008.After adjusting and flooding, the recovery degree increases only 3.26%, the remaining recoverable reserves are 189.52 脳 10 ~ 4 t, and a large number of remaining oil still exist in the block, which has the potential to further improve the development effect of water flooding.To improve the final recovery.The results of laboratory test of weak gel flooding show that the plugging ability of weak gel decreases with the increase of reservoir permeability. When permeability is less than 20 脳 10 ~ (-3) 渭 m ~ (2), the plugging ability of oil layer reaches more than 98%, and the plugging ability increases with the increase of permeability.When the permeability difference is greater than 4.3, the liquid fraction of the low permeability tube is larger than that of the high permeability layer, and the weak gel has a certain degree of plugging to the oil phase, while the plugging ability of the weak gel to the high permeability layer increases, and the plugging ability of the weak gel to the low permeability layer decreases.However, the plugging ability is much less than that of water phase. When water drives to 30PV, the plugging efficiency of water phase decreases, and with the aging of colloid, the plugging performance of weak gel decreases, and when the aging time is more than 80 days, the plugging rate of weak gel decreases obviously.涓，

本文編號(hào)：1704706