自振空化射流改善油层特性实验研究及现场应用
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摘要
自振空化射流是具有强烈压力振荡和高空化起始能力的新型射流,利用高压釜装置对围压下自振空化射流提高污染岩渗透率进行的实验研究结果表明,对中、低和高渗透率岩样,空化射流作用深度均超过250mm,渗透率提高率随射流压力的增大而增加,随喷距的增大而减小;当围压值为2MPa时,渗透率提高率达到最大值。同时,在相同条件下,自振空化喷嘴作用下渗透率提高率为锥形喷嘴作用的2倍以上。现场应用效果证明,自振空化射流对解除油层和水层堵塞有明显效果。
Self-resonating cavitation jet is a new type jet with the characteristics of strong pressure oscillation and high-cavitation inception.The effects of working parameters on the improvement of permeability of polluted rock by self-resonating cavitation jets impingement in a high-pressure vessel were investigated.The result shows that the effective depth of cavitation jet on the polluted rocks with different permeability is more than 250mm.The increasing rate of permeability could be improved with the jet pressure increasing and reduced with the nozzle stand-off distance increasing.Meanwhile,the increasing rate of permeability can reach the maximum at the ambient pressure of 2MPa.Under the same conditions,the increasing rate resulted from the self-resonating cavitation jet nozzle is two times of that from a conical nozzle.Field applications also showed that the self-resonating cavitation jets have obvious effectiveness on the plug removal of oil and water injection wells.
Self-resonating cavitation jet is a new type jet with the characteristics of strong pressure oscillation and high-cavitation inception.The effects of working parameters on the improvement of permeability of polluted rock by self-resonating cavitation jets impingement in a high-pressure vessel were investigated.The result shows that the effective depth of cavitation jet on the polluted rocks with different permeability is more than 250mm.The increasing rate of permeability could be improved with the jet pressure increasing and reduced with the nozzle stand-off distance increasing.Meanwhile,the increasing rate of permeability can reach the maximum at the ambient pressure of 2MPa.Under the same conditions,the increasing rate resulted from the self-resonating cavitation jet nozzle is two times of that from a conical nozzle.Field applications also showed that the self-resonating cavitation jets have obvious effectiveness on the plug removal of oil and water injection wells.
引文
[1]邵长金,罗荣章,孙仁远,等.利用物理场提高原油产量的基础研究[J].石油学报,1997,18(3):63-70.
[2]李根生,沈忠厚,周长山,等.自振空化射流研究与应用进展[J].中国工程科学,2005,7(1):27-32.
[3]Johnson V E Jr,Chahine G L,Lindenmuth W T,et al.The devel-opment of structured cavitating Jet for deep hole bits[R].SPE11060,1982:1-8.
[4]易灿,李根生,张定国.围压下喷嘴空化起始能力的实验研究[M].北京:海洋出版社,2004:357-363.
[5]李根生,沈忠厚,周长山,等.自振空化射流冲击压力脉动特性实验研究[J].水动力学研究与进展,2003,18(5):570-575.
[6]李根生,沈忠厚,彭烨.自动旋转喷嘴的理论研究[J].石油学报,1995,16(4):148-153.
[7]李根生,马加计,沈晓明.高压水射流处理地层的机理及试验[J].石油学报,1998,19(1):96-99.
[8]李根生,沈忠厚.风琴管自振空化喷嘴设计原理[J].石油大学学报:自然科学版,1992,16(5):35-39.
[9]李亚林,贺振华,黄德济,等.岩石孔渗透性与地震波衰减、传播速度的相互关系[J].天然气工业,2001,21(4):7-11.
[10]严炽培,吴小薇,李正开,等.用超声波提高油气渗流速度的研究[J].石油大学学报:自然科学版,1989,13(6):72-78.
[2]李根生,沈忠厚,周长山,等.自振空化射流研究与应用进展[J].中国工程科学,2005,7(1):27-32.
[3]Johnson V E Jr,Chahine G L,Lindenmuth W T,et al.The devel-opment of structured cavitating Jet for deep hole bits[R].SPE11060,1982:1-8.
[4]易灿,李根生,张定国.围压下喷嘴空化起始能力的实验研究[M].北京:海洋出版社,2004:357-363.
[5]李根生,沈忠厚,周长山,等.自振空化射流冲击压力脉动特性实验研究[J].水动力学研究与进展,2003,18(5):570-575.
[6]李根生,沈忠厚,彭烨.自动旋转喷嘴的理论研究[J].石油学报,1995,16(4):148-153.
[7]李根生,马加计,沈晓明.高压水射流处理地层的机理及试验[J].石油学报,1998,19(1):96-99.
[8]李根生,沈忠厚.风琴管自振空化喷嘴设计原理[J].石油大学学报:自然科学版,1992,16(5):35-39.
[9]李亚林,贺振华,黄德济,等.岩石孔渗透性与地震波衰减、传播速度的相互关系[J].天然气工业,2001,21(4):7-11.
[10]严炽培,吴小薇,李正开,等.用超声波提高油气渗流速度的研究[J].石油大学学报:自然科学版,1989,13(6):72-78.
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