致密砂岩气藏不同自吸压差下水锁损害
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摘要
普遍认为致密砂岩气藏在负压差自吸时不存在水锁损害。为此,依据现场资料设计无压差、正压差、负压差自吸条件下水锁损害实验,通过测试束缚水饱和度及当前含水饱和度,判断研究区域是否发生水锁损害。以返排后渗透率与初始渗透率比值来评价水锁损害程度,比值越大水锁损害程度越小。实验结果表明:研究区域当前含水饱和度明显高于束缚水饱和度,存在水锁损害。虽然负压差条件下水锁损害程度最小,但是水锁损害依然严重。可见,当致密砂岩气藏以负压差生产时,水锁损害同样不容忽视。
It was generally believed that there was no water lock damage under negative self-imbibition pressure difference in the tight sandstone gas reservoir. Therefore,designed water lock damage experiment under no pressure difference,positive pressure difference,negative pressure difference self-imbibition conditions,in order to determine whether the study area has water lock damage,the irreducible water saturation and current water saturation was tested. After flow back,the ratio of present permeability to initial permeability was used to evaluate the degree of water lock damage. The greater the ratio,the smaller the degree of water lock damage. The results show that the current water saturation was significantly higher than the irreducible water saturation,and the study area has water lock damage. Although the water lock damage was the smallest under negative pressure difference,but the water lock damage was still terrible. It is concluded that when tight sandstone gas reservoirs are produced under negative pressure difference,the water lock damage can not be ignored.
It was generally believed that there was no water lock damage under negative self-imbibition pressure difference in the tight sandstone gas reservoir. Therefore,designed water lock damage experiment under no pressure difference,positive pressure difference,negative pressure difference self-imbibition conditions,in order to determine whether the study area has water lock damage,the irreducible water saturation and current water saturation was tested. After flow back,the ratio of present permeability to initial permeability was used to evaluate the degree of water lock damage. The greater the ratio,the smaller the degree of water lock damage. The results show that the current water saturation was significantly higher than the irreducible water saturation,and the study area has water lock damage. Although the water lock damage was the smallest under negative pressure difference,but the water lock damage was still terrible. It is concluded that when tight sandstone gas reservoirs are produced under negative pressure difference,the water lock damage can not be ignored.
引文
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12 游利军.低渗透砂岩气层水锁损害机理及应用研究[D].成都:西南石油学院,2004You Lijun. Mechanism and application of water lock damage in low permeability sandstone gas reservoirs[D]. Chengdu:Southwest Petroleum Institute,2004
13 游利军,康毅力,陈一健.致密砂岩含水饱和度建立新方法—毛管自吸法[J].西南石油学院学报,2005,27(1):28-31You Lijun,Kang Yili,Chen Yijian. New method of water saturation of tight gas-spontanoeus imbibition[J]. Journal of Southwest Petroleum Institute,2005,27(1):28-31
14 高青松.大牛地气田致密砂岩气藏水锁伤害特征分析[J].科学技术与工程,2018,18(17):156-162Gao Qingsong. Analysis of water lock damage characteristics of tight sandstone gas reservoir in daniudi gas field[J]. Science Technology and Engineering,2018,18(17):156-162
2 戴金星,倪云燕,吴小奇.中国致密砂岩气及在勘探开发上的重要意义[J].石油勘探与开发,2012,39(3):257-264Dai Jinxing,Ni Yunyan,Wu Xiaoqi. Tight gas in China and its significance in exploration and exploitation[J]. Petroleum Exploration and Development,2012,39(3):257-264
3 刘吉余,马志欣,孙淑艳.致密含气砂岩研究现状及发展展望[J].天然气地球科学,2008,19(3):316-319Liu Jiyu,Ma Zhixin,Sun Shuyan. Present research situation and prospects of tight gas sands[J]. Natural Gas Geoscience,2008,19(3):316-319
4 陈鹏,王新海,李公让,等.低渗透砂岩油藏水锁损害影响因素分析[J].特种油气藏,2013,20(1):89-91Chen Peng,Wang Xinhai,Li Gongrang,et al. Analysis of factors influencing water blocking damage in low-permeability sandstone reservoirs[J]. Specialty Oil and Gas Reservoir,2013,20(1):89-91
5 张振华,鄢捷年.低渗透砂岩储集层水锁损害影响因素及预测方法研究[J].石油勘探与开发,2000,27(3):75-78Zhang Zhenhua,Yan Jienian. Study on prediction methods and factors influencing water blocking damage in low permeability sandstone reservoirs[J]. Petroleum Exploration and Development,2000,27(3):75-78
6 赖南君,叶仲斌,刘向君,等.低渗透致密砂岩气藏水锁损害室内研究[J].天然气工业,2005,25(4):125-127Lai Nanjun,Ye Zhongbin,Liu Xiangjun,et al. Indoor study of water lock damage in low permeability tight sandstone gas reservoirs[J].Natural Gas Industry,2005,25(4):125-127
7 耿娇娇,鄢捷年,邓田青,等.低渗透凝析气藏储层损害特征及钻井液保护技术[J].石油学报,2011,32(5):893-899Geng Jiaojiao,Yan Jienian,Deng Tianqing,et al. Characteristics of formation damage and protection drilling fluids for condensate gas reservoirs with low-permeability[J]. Journal of Petroleum,2011,32(5):893-899
8 任冠龙,吕开河,徐涛,等.低渗透储层水锁损害研究新进展[J].中外能源,2013,18(12):55-61Ren Guanlong,LüKaihe,Xu Tao,et al. Progress of the study on water blocking damage in the low permeability reservoirs[J]. SinoGlobal Energy,2013,18(12):55-61
9 Stephen A H. Factors affecting water blocking and gas flow from hydraulically fractured gas wells[J]. Journal of Petroleum Technology,1979,31(12):1515-1524
10 Cimolai M P. Reductions in the productivity of oil and low permeability gas reservoirs due to aqueous phase trapping[J]. Journal of Canadian Petroleum Technology,1994,33(9):44-54
11 李振铎.鄂尔多斯盆地上古生界深盆气勘探研究新进展[J].天然气工业,1999,19(3):15-17Li Zhenduo. Developments in the exploration and research on the deep-basin gas in upper Paleozoic in eerduosi Basin[J]. Natural Gas Industry,1999,19(3):15-17
12 游利军.低渗透砂岩气层水锁损害机理及应用研究[D].成都:西南石油学院,2004You Lijun. Mechanism and application of water lock damage in low permeability sandstone gas reservoirs[D]. Chengdu:Southwest Petroleum Institute,2004
13 游利军,康毅力,陈一健.致密砂岩含水饱和度建立新方法—毛管自吸法[J].西南石油学院学报,2005,27(1):28-31You Lijun,Kang Yili,Chen Yijian. New method of water saturation of tight gas-spontanoeus imbibition[J]. Journal of Southwest Petroleum Institute,2005,27(1):28-31
14 高青松.大牛地气田致密砂岩气藏水锁伤害特征分析[J].科学技术与工程,2018,18(17):156-162Gao Qingsong. Analysis of water lock damage characteristics of tight sandstone gas reservoir in daniudi gas field[J]. Science Technology and Engineering,2018,18(17):156-162