【摘要】：為提高塔河油田裂縫性油藏的酸壓改造效果,研究了CO_2對(duì)裂縫性油藏酸巖反應(yīng)影響的問題。利用自主研制的裂縫性儲(chǔ)層酸巖反應(yīng)儀,基于網(wǎng)狀裂縫模型,對(duì)考慮CO_2影響的不同類型、不同黏度和不同濃度酸液的酸巖反應(yīng)情況進(jìn)行了試驗(yàn)評(píng)價(jià)。試驗(yàn)得出:隨著回壓增大,酸巖反應(yīng)產(chǎn)生的CO_2轉(zhuǎn)變?yōu)槌R界態(tài)后大量溶于酸液中,酸液流動(dòng)阻力大幅降低,酸蝕量增大;與膠凝酸及Ⅰ型地面交聯(lián)酸相比,HCl質(zhì)量分?jǐn)?shù)為20%的Ⅱ型地面交聯(lián)酸濾失量小、黏度高,受CO_2影響最大,酸巖反應(yīng)最慢,有利于實(shí)現(xiàn)裂縫性儲(chǔ)層深穿透酸壓的目的。Ⅱ型地面交聯(lián)酸在YJY井重復(fù)酸壓中進(jìn)行了現(xiàn)場試驗(yàn),與該井應(yīng)用膠凝酸的首次酸壓效果相比,液體效率大幅提高,酸蝕縫縫長大幅增加,壓裂后累計(jì)產(chǎn)油1.2×104 t,增油效果顯著。研究表明,超臨界CO_2有助于降低酸液流動(dòng)阻力,提高酸液深穿透能力,提高塔河油田裂縫性儲(chǔ)層酸壓改造效果。
[Abstract]:In order to improve the acid fracturing effect of fractured reservoir in Tahe oilfield, the influence of CO_2 on acid rock reaction in fractured reservoir was studied. Based on the reticulated fracture model, the acid rock reaction of different types, different viscosity and different concentration of acid solution considering the influence of CO_2 has been evaluated by using a self-developed acid rock reaction instrument for fractured reservoirs. The results show that with the increase of backpressure, the CO_2 produced by acid-rock reaction is transformed into super-critical state and then dissolved in acid solution, the flow resistance of acid liquid decreases greatly, and the amount of acid corrosion increases. Compared with cementitious acid and ground cross-linked acid type 鈪，

本文編號(hào)：2465349