【摘要】：超深致密砂巖裂縫性氣藏使用高密度全油基鉆井液鉆遇漏失復(fù)雜時,選用常規(guī)的防漏堵漏材料無法滿足油相分散、酸溶和高承壓等要求。為此,引入了油相分散、剛性高、酸溶率高的鋁合金材料,該材料為密度1.60 g/cm~3的多面鋸齒狀鋁合金顆粒(以下簡稱GYD),將泡沫態(tài)鋁合金研磨成3~80目,較之于現(xiàn)用大理石架橋顆粒,GYD在油相中分散完全,莫氏硬度提高近2倍(介于5~6),酸溶率超過90%。按地層裂縫開度的1/2~2/3架橋規(guī)則,對以高密度全油基鉆井液為基漿,GYD作為骨架顆粒,配合加入纖維類材料和可變性填充粒子的漿液進(jìn)行高溫高壓動靜態(tài)堵漏室內(nèi)模擬評價。實(shí)驗(yàn)結(jié)果表明,GYD加量為8%時,堵漏鉆井液封堵強(qiáng)度超過25 MPa,酸溶率達(dá)到65%,穩(wěn)定性良好,48 h密度差小于0.03 g/cm~3。在塔里木盆地某井的現(xiàn)場試驗(yàn)效果表明,該井氣藏埋深7 220 m,應(yīng)用高密度油基鉆井液日均漏失量約50 m~3,采用GYD防漏堵漏后鉆進(jìn)無漏失,順利鉆穿儲層,較好地實(shí)現(xiàn)了鉆進(jìn)中地層縫內(nèi)高流動阻力和高承壓的"高剛性架橋+纖維成網(wǎng)+變形填充"封堵功能。
[Abstract]:When high density full oil based drilling fluid is used in ultra deep tight sandstone fracture gas reservoir, conventional leakage prevention and plugging materials can not meet the requirements of oil phase dispersion, acid dissolution and high pressure. For this reason, the aluminum alloy material with oil phase dispersion, high rigidity and high acid solubility is introduced, which is a multi-sided serrated aluminum alloy particle with density of 1.60 g/cm~3 (hereinafter referred to as GYD), foam aluminum alloy is ground into 3 脳 80 mesh. Compared with the existing marble bridge particles, GYD is dispersed completely in the oil phase, the Morse hardness is nearly 2 times (between 5 鈮，

本文編號：2521541