【摘要】：塔里木油田塔中地區(qū)碳酸鹽巖奧陶系儲層地質(zhì)條件復雜,儲層裂縫發(fā)育,裂縫開度為20~400μm的小裂縫和微裂縫所占比例在50%左右,鉆井過程中井漏溢流頻發(fā),氣侵現(xiàn)象嚴重,增加了井控風險。由于地層微裂縫分布復雜,且溫度高(180℃),導致架橋粒子、充填粒子級配難度大,鉆井液封堵效果不理想,而采用常規(guī)鉆井液封堵評價方法在模擬裂縫形態(tài)和效果評價方面與現(xiàn)場實際存在著較大的差距。為此,提出了有針對性地封縫堵氣評價方法 :利用天然/人造巖心制作出微裂縫巖心模型,微裂縫開度介于20~400μm之間,縫面粗糙度與天然裂縫接近;自主設(shè)計了封縫堵氣實驗評價裝置,建立了微米級裂縫的封縫堵氣評價方法。室內(nèi)初步優(yōu)選出抗高溫的顆粒、纖維、可變形材料等納微米封堵材料,并形成封堵配方,封堵配方與聚磺鉆井液體系、ENVIROTHERM NT體系配伍性好,且酸溶率高于70%,不易污染儲層。
[Abstract]:The geological conditions of carbonate Ordovician reservoir in Tazhong area of Tarim Oilfield are complex, and the reservoir fractures are developed. The proportion of small fractures and microfractures with fracture opening of 20 ~ 400 渭 m is about 50%. The leakage and overflow of wells occur frequently during drilling, and the phenomenon of gas invasion is serious, which increases the risk of well control. Because of the complex distribution of formation microfractures and high temperature (180 鈩，

本文編號：2513566