本文關(guān)鍵詞： 水敏儲層 乳化酸 醇基酸 解堵 性能評價 工藝優(yōu)化　出處：《東北石油大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：針對莫里青油藏伊通盆地莫里青斷陷西北緣雙陽組二段儲層注水困難的實際情況,首先分別對油田地層損害、油井堵塞原因、油井腐蝕原因、潛在酸化傷害和結(jié)垢原因等5個因素進行了再認識和分析,結(jié)果表明,除了地層敏感性導(dǎo)致?lián)p害之外,懸浮固體顆粒,垢,細菌及腐蝕產(chǎn)物,潛在的二次酸化沉淀物及瀝青質(zhì)膠質(zhì)也對儲層產(chǎn)生傷害。接著分析了砂巖儲層礦物與鹽酸、氫氟酸、氟硅酸、氟硼酸以及多氫酸等酸液的反應(yīng)機理,為優(yōu)化酸化提供理論支撐。在綜合分析莫里青油藏基本特征、儲層傷害機理和酸巖反應(yīng)機理的基礎(chǔ)上,提出開展油包水型乳化酸解堵體系和醇基酸解堵體系研究及解除地層傷害評價,為現(xiàn)場應(yīng)用做好前期基礎(chǔ)研究。采用單因素法篩選乳化緩速酸解堵主酸體系配方63%土酸+30%0#柴油+2%復(fù)合乳化劑+1%鐵穩(wěn)定劑+3%防膨劑+0.1%助排劑。研制的乳化酸解堵液表面張力小,致使其在親油巖石界面上的鋪展系數(shù)大,有利于酸-巖反應(yīng)均勻進行；粘度比未乳化土酸略大,有利于增加了內(nèi)相的H+的穿透阻力,降低了酸-巖反應(yīng)速率；密度比未乳化土酸略小,有利于殘酸返排。該乳化酸具有緩速、防腐、防膨以及對巖石骨架損害小等優(yōu)良性能,溶蝕速率緩升緩降,有利于近井地帶酸化。同樣采用單因素法篩選醇基酸解堵主酸液體系配方8%HCl+6% NH4F+1％ ATPM+2% SL-HS2(緩蝕劑)+1%EDTA(鐵穩(wěn)定劑)+2%防膨劑(KL無機鹽+SL陽離子表面活性劑)+0.1%FC7321(助排劑)+25%乙醇。醇基酸解堵液也具有緩速、防腐、防膨以及對巖石骨架損害小等優(yōu)良性能,對砂巖巖心的溶蝕速率呈現(xiàn)出緩升緩降的變化,達到了緩慢溶蝕的目的,有利于深部地層解堵和解除污染。室內(nèi)模擬酸化現(xiàn)場工藝實驗表明,乳化緩速酸解堵主酸體系和醇基酸解堵體系能夠有效恢復(fù)并提高未污染和污染后的巖心滲透率,能滿足了現(xiàn)場施工需要。
[Abstract]:In view of the difficulty of water injection in the second member of Shuangyang formation in the northwestern margin of Morri fault depression in Morri Qing reservoir, the formation damage, oil well blockage and oil well corrosion are caused by formation damage, oil well plugging, oil well corrosion, respectively. Five factors, including potential acidizing damage and scaling cause, were re-recognized and analyzed. The results showed that, in addition to formation sensitivity, suspended solid particles, scale, bacteria and corrosion products, Potential secondary acidizing precipitates and asphaltene also damage the reservoir. Then the reaction mechanism of sandstone reservoir minerals with hydrochloric acid, hydrofluoric acid, fluorosilicic acid, fluoroboric acid and polyhydrogen acid is analyzed. On the basis of comprehensive analysis of the basic characteristics of Morri oil reservoir, reservoir damage mechanism and acid rock reaction mechanism, The research on water-in-oil emulsified acid plugging removal system and alcohol-based acid plugging removal system and the evaluation of formation damage relief are put forward. The formulation of 63% earic acid 300# diesel oil 2% composite emulsifier 1% iron stabilizer 3% anti-swelling agent 0.1% was selected by single factor method for field application. The surface tension of acidizing and plugging solution is small, As a result, its spreading coefficient on the interface of oil-friendly rock is large, which is favorable to the homogeneous acid-rock reaction, and its viscosity is slightly higher than that of unemulsified soil acid, which is beneficial to increase the penetrating resistance of H in the inner phase and to reduce the acid-rock reaction rate. The density is slightly smaller than that of unemulsified soil acid, which is favorable to the residual acid reflux. The emulsified acid has excellent properties such as slow speed, anticorrosion, anti-swelling and little damage to the rock skeleton, and the dissolution rate rises slowly and decreases slowly. It is beneficial to acidification near well area. Similarly, the single factor method is used to screen out HCl 6% NH4F 1% ATPM 2% SL-HS2 (corrosion inhibitor) 1TA (iron stabilizer) 2% anti-swelling salt SL cationic surfactant). 0.17321 (drainage aid) 25% ethanol. The alcohol-based acid deplugging solution also has a slow speed. The excellent properties of anticorrosion, anti-swelling and small damage to the rock skeleton show a slow rise and decrease in the dissolution rate of the sandstone core, and achieve the purpose of slow dissolution. Laboratory simulation of acidizing field experiments show that the main acid system and the alcohol-based acid plugging system can effectively restore and improve the permeability of unpolluted and polluted cores, and the experimental results show that the emulsion slow acid removal system and the alcohol-based acid plugging system can effectively restore and improve the permeability of unpolluted and polluted cores. Can meet the site construction needs.
【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】：2015
【分類號】：TE357.2

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