压裂液作用下致密砂岩储层应力敏感性研究
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摘要
以陇东地区M油田长8储层为研究对象,评价压裂液浸泡对致密储层应力敏感性的影响。结果表明,干燥基块岩心存在弱～中等偏弱的应力敏感性,加压后再卸压,渗透率不能完全恢复,损害率为19%～22.6%;裂缝岩样存在中等偏强～强应力敏感性,渗透率基本不可恢复,平均损害率为97%。压裂液浸泡后,应力敏感性整体强于压裂液未作用前,基块的应力敏感性为中等偏强,裂缝岩样的应力敏感性为强;卸载后,裂缝岩样渗透率损害依然显著。压裂液浸泡会使岩石强度降低,压裂液作用下致密砂岩储层渗透率下降的原因除应力敏感性损害外,还有天然裂缝与水力裂缝堵塞、压裂液残渣损害及润湿性反转等引发的损害等。因此建议尽量缩短压裂液作用时间,研发低伤害性能的压裂液。
Based on Chang 8 reservoir of M oilfield in Longdong,the stress sensitivity of tight reservoir under the soak of fracturing fluid is evaluated.The results showed the dry matrix core had weak to moderate weak stress sensitivity,and the permeability can not be completely recovered after load relieved with the damage rate of 19% ～ 22.6%.The fractured rock samples had moderate strong to strong stress sensitivity,and the permeability was basically unrecoverable with the average damage rate of 97%.The stress sensitivity of the matrix core and the fractured cores were moderately strong and strong respectively after soaked in fracturing fluid;after unloading,the permeability damage in fractured rock was still significant.Fracturing fluid acting on crack for long time will weaken the strength of rock and increase the chance of stress sensitivity.The reason for damage included stress sensitivity,damage caused by solid plugging,the residual content in fracturing fluid and wettability alteration.It suggests to shorten the fracturing time and develop fracturing fluid with low damage.
Based on Chang 8 reservoir of M oilfield in Longdong,the stress sensitivity of tight reservoir under the soak of fracturing fluid is evaluated.The results showed the dry matrix core had weak to moderate weak stress sensitivity,and the permeability can not be completely recovered after load relieved with the damage rate of 19% ～ 22.6%.The fractured rock samples had moderate strong to strong stress sensitivity,and the permeability was basically unrecoverable with the average damage rate of 97%.The stress sensitivity of the matrix core and the fractured cores were moderately strong and strong respectively after soaked in fracturing fluid;after unloading,the permeability damage in fractured rock was still significant.Fracturing fluid acting on crack for long time will weaken the strength of rock and increase the chance of stress sensitivity.The reason for damage included stress sensitivity,damage caused by solid plugging,the residual content in fracturing fluid and wettability alteration.It suggests to shorten the fracturing time and develop fracturing fluid with low damage.
引文
[1]钟高润,张小莉,杜江民,等.致密砂岩储层应力敏感性实验研究[J].地球物理学进展,2016,31(3):1300-1306.
[2]康毅力,林冲,游利军,等.油基钻井完井液侵入对页岩储层应力敏感性的影响[J].天然气工业,2015,35(6):64-69.
[3]王瑞飞,陈明强,孙卫.特低渗透砂岩储层微裂缝特征及微裂缝参数的定量研究———以鄂尔多斯盆地沿25区块、庄40区块为例[J].矿物学报,2008,28(2):215–220.
[4]南珺祥,王素荣,姚卫华,等.鄂尔多斯盆地陇东地区延长组长6–8特低渗透储层微裂缝研究[J].岩性油气藏,2007,19(4):40-44.
[5]游利军,王巧智,康毅力,等.压裂液浸润对页岩储层应力敏感性的影响[J].油气地质与采收率,2014,26(2):102-106.
[6]蒋海,杨兆中,胡月华,等.低压致密气藏压裂液损害关键因素分析[J].石油天然气学报,2008,30(05X):324-327.
[7]姜阿娜.醇基压裂液在深层低渗油藏压裂改造中的应用[J].精细石油化工进展,2012,13(7):5-7.
[8]陈馥,林科君,王光平,等.不同pH值下改性瓜胶压裂液的微观伤害机理[J].钻井液与完井液,2010,27(2):57-59.
[9]李传亮.裂缝性油藏的应力敏感性及产能特征[J].新疆石油地质,2008,29(1):72–75.
[10]黄思静,单钰铭,刘维国,等.储层砂岩岩石力学性质与地层条件的关系研究[J].岩石力学与工程学报,1999,5(4):456-460.
[11]何金钢,康毅力,游利军,等.特低渗透砂岩油藏压裂液损害实验评价[J].油田化学,2013,30(2):173-177.
[2]康毅力,林冲,游利军,等.油基钻井完井液侵入对页岩储层应力敏感性的影响[J].天然气工业,2015,35(6):64-69.
[3]王瑞飞,陈明强,孙卫.特低渗透砂岩储层微裂缝特征及微裂缝参数的定量研究———以鄂尔多斯盆地沿25区块、庄40区块为例[J].矿物学报,2008,28(2):215–220.
[4]南珺祥,王素荣,姚卫华,等.鄂尔多斯盆地陇东地区延长组长6–8特低渗透储层微裂缝研究[J].岩性油气藏,2007,19(4):40-44.
[5]游利军,王巧智,康毅力,等.压裂液浸润对页岩储层应力敏感性的影响[J].油气地质与采收率,2014,26(2):102-106.
[6]蒋海,杨兆中,胡月华,等.低压致密气藏压裂液损害关键因素分析[J].石油天然气学报,2008,30(05X):324-327.
[7]姜阿娜.醇基压裂液在深层低渗油藏压裂改造中的应用[J].精细石油化工进展,2012,13(7):5-7.
[8]陈馥,林科君,王光平,等.不同pH值下改性瓜胶压裂液的微观伤害机理[J].钻井液与完井液,2010,27(2):57-59.
[9]李传亮.裂缝性油藏的应力敏感性及产能特征[J].新疆石油地质,2008,29(1):72–75.
[10]黄思静,单钰铭,刘维国,等.储层砂岩岩石力学性质与地层条件的关系研究[J].岩石力学与工程学报,1999,5(4):456-460.
[11]何金钢,康毅力,游利军,等.特低渗透砂岩油藏压裂液损害实验评价[J].油田化学,2013,30(2):173-177.
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