煤层气井压裂曲线和储层污染程度的响应关系
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摘要
为了研究压裂曲线与储层污染程度的响应关系,以沁水盆地柿庄区块为例,在区块内选取储层敏感性强弱不同的井,通过比较各井压裂施工曲线中油压曲线到达破裂压力后下降行迹特征的差异,总结出油压曲线下降行迹与储层敏感性的响应规律。然后在同一区块内根据油压曲线下降行迹判定几口井的储层敏感性,根据储层渗透率损害比模型计算出几口井开发煤层段的储层渗透率损害比。结果发现,预测出的储层敏感性强井具有较高的储层渗透率损害比,储层受到严重污染;储层敏感性弱井储层受到轻度污染。研究表明油压曲线到达破裂压力点后的下降行迹能够反映储层污染程度,可以为后期工程开发提供依据。
In order to study the relationship between response curve and the pollution degree of fractured reservoir,taking Shizhuang block in Qinshui basin as an example, wells with different sensitivity of reservoir in the block were selected, through comparison of the difference of the dropping trace characteristics after the hydraulic curve reaches the fracture pressure in the fracturing curves of fracturing operation in different wells, the response law of hydraulic dropping trace and the reservoir sensitivity was summed up. Then in the same block according to the dropping trace of the hydraulic curves, the sensibility of reservoir was judged in several wells. According to the calculation model of reservoir permeability damage ratio, the permeability damage ratio of several well development sections was calculated. The results found that the wells with strong predicted reservoir sensibility had higher reservoir permeability damage ratio, and reservoir was seriously polluted. Wells with weak reservoir sensibility was slightly polluted. It shows that the dropping trace after the hydraulic curve reaches the fracture pressure can reflect the reservoir pollution degree, and provides the basis for later engineering development.
In order to study the relationship between response curve and the pollution degree of fractured reservoir,taking Shizhuang block in Qinshui basin as an example, wells with different sensitivity of reservoir in the block were selected, through comparison of the difference of the dropping trace characteristics after the hydraulic curve reaches the fracture pressure in the fracturing curves of fracturing operation in different wells, the response law of hydraulic dropping trace and the reservoir sensitivity was summed up. Then in the same block according to the dropping trace of the hydraulic curves, the sensibility of reservoir was judged in several wells. According to the calculation model of reservoir permeability damage ratio, the permeability damage ratio of several well development sections was calculated. The results found that the wells with strong predicted reservoir sensibility had higher reservoir permeability damage ratio, and reservoir was seriously polluted. Wells with weak reservoir sensibility was slightly polluted. It shows that the dropping trace after the hydraulic curve reaches the fracture pressure can reflect the reservoir pollution degree, and provides the basis for later engineering development.
引文
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[2]吕帅锋,王生维,张晓飞,等.煤层气钻井固相物污染特征及评价[J].煤田地质与勘探,2017,45(1):162-167.LYU Shuaifeng,WANG Shengwei,ZHANG Xiaofei,et al.Pollution characteristics and evaluation of solid-phase materials in CBM drilling[J].Coal Geology&Exploration,2017,45(1):162-167.
[3]许明标,宋建建,由福昌.固井水泥浆对储层损害的再认识[J].断块油气田,2017,24(5):731-734.XU Mingbiao,SONG Jianjian,YOU Fuchang.Re-recognition of cement slurry damage to reservoir[J].Fault-Block Oil&Gas Field,2017,24(5):731-734.
[4]陈军,马玄,岳前升,等.沁水盆地清水钻井液对煤储层损害机理[J].煤矿安全,2014,45(11):68-71.CHEN Jun,MA Xuan,YUE Qiansheng,et al.Damage mechanism of clear water drilling fluid on coal reservoir in Qinshui basin[J].Safety in Coal Mines,2014,45(11):68-71.
[5]杨帆,彭小龙,莫非,等.沁水盆地柿庄南区块煤层气开发现状分析[J].内蒙古石油化工,2016,42(4):34-36.YANG Fan,PENG Xiaolong,MO Fei,et al.Coalbed methane development status of south block in Shizhuang of Qinshui basin[J].Inner Mongolia Petrochemical Industry,2016,42(4):34-36.
[6]林鑫,张士诚,张劲,等.柳林煤层气储层敏感性评价实验[J].煤田地质与勘探,2011,39(6):28-31.LIN Xin,ZHANG Shicheng,ZHANG Jin,et al.Sensitivity evaluation experiment of Liulin CBM reservoir[J].Coal Geology&Exploration,2011,39(6):28-31.
[7]田永东,武杰.沁水盆地南部高煤阶煤储层敏感性[J].煤炭学报,2014,39(9):1835-1839.TIAN Yongdong,WU Jie.Sensitivity of high-rank coalbed methane reservoir in the southern Qinshui basin[J].Journal of China Coal Society,2014,39(9):1835-1839.
[8]耿昀光,汤达祯,许浩,等.安泽区块煤储层孔裂隙特征及水敏效应损害机理[J].煤炭科学技术,2017,45(5):175-180.GENG Yunguang,TANG Dazhen,XU Hao,et al.Pore cracking features of coal reservoir in Anze block and water sensitive effect failure mechanism[J].Coal Science and Technology,2017,45(5):175-180.
[9]张永平,杨艳磊,唐新毅,等.沁南地区高煤阶煤储层流速敏感性及影响因素[J].煤田地质与勘探,2015,43(4):36-40.ZHANG Yongping,YANG Yanlei,TANG Xinyi,et al.Velocity sensitivity and its influencing factors of high-rank coal reservoirs in southern Qinshui basin[J].Coal Geology&Exploration,2015,43(4):36-40.
[10]高向东,王延斌,张崇崇.钻井中煤体结构特征与井壁稳定性分析研究[J].煤炭科学技术,2016,44(5):95-99.GAO Xiangdong,WANG Yanbin,ZHANG Chongchong.Study and analysis on coal structure features during drilling operation and well wall stability[J].Coal Science and Technology,2016,44(5):95-99.
[11]刘勇,卢义玉,魏建平,等.降低井下煤层压裂起裂压力方法研究[J].中国安全科学学报,2013,23(9):96-100.LIU Yong,LU Yiyu,WEI Jianping,et al.A novel method for decreasing coal seam fracture initiation pressure[J].China Safety Science Journal,2013,23(9):96-100.
[12]计勇,曹砚锋,于继飞,等.煤层气井高破裂压力因素分析及解决措施[J].重庆科技学院学报(自然科学版),2016,18(3):74-77.JI Yong,CAO Yanfeng,YU Jifei,et al.Exploration of solutions and analysis on the factors of high fracturing pressure of coalbed methane well[J].Journal of Chongqing University of Science and Technology(Natural Science Edition),2016,18(3):74-77.
[13]胡奇,王生维,张晨,等.沁南地区煤体结构对煤层气开发的影响[J].煤炭科学技术,2014,42(8):65-68.HU Qi,WANG Shengwei,ZHANG Chen,et al.Coal structure affected to coalbed methane development in Qinnan region[J].Coal Science and Technology,2014,42(8):65-68.
[14]范翔宇,龚明,夏宏泉,等.裂缝性致密砂岩储层钻井液侵入深度的定量计算方法[J].天然气工业,2012,32(6):60-64.FAN Xiangyu,GONG Ming,XIA Hongquan,et al.A quantitative calculation method of the invasion depth of drilling fluids into the fractured tight sandstone reservoirs[J].Natural Gas Industry,2012,32(6):60-64.
[15]范翔宇,夏宏泉,陈平,等.钻井泥浆污染储层程度的测井评价方法研究[J].天然气工业,2005,25(10):100-102.FAN Xiangyu,XIA Hongquan,CHEN Ping,et al.Logging evaluation mechanism of reservoir pollution level by drilling fluid[J].Natural Gas Industry,2005,25(10):100-102.