全金属螺杆泵漏失规律及配合间隙优化研究
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摘要
全金属螺杆泵定转子采用间隙密封螺旋举升,在多种因素影响条件下,存在间隙漏失规律认识不清、定转子配合间隙优化方法不完善等问题。为此,通过建立2∶3头螺杆泵实体模型,根据螺杆泵内压力分布规律,综合考虑温度、压力、介质黏度和转速等参数影响,采用有限元模拟仿真方法,分析了全金属螺杆泵定转子漏失及接触磨损规律。以高泵效、低接触压力为目标,优化了全金属螺杆泵定转子配合间隙:介质黏度≤0. 05 Pa·s时,间隙取0. 15～0. 30 mm;介质黏度>0. 05 Pa·s时,间隙取0. 20～0. 40 mm。5口井的现场应用结果表明:所实施井泵效平均提高15. 1%,单井日增油3. 13 t,平均生产周期433 d,最长生产周期达到542 d且继续有效。研究成果满足全金属螺杆泵现场应用需求,对其优化设计及性能的高效发挥意义重大。
All metal progressing cavity pump stator and rotor are made of metal material,and the working temperature reaches 400 ℃,which solves the problem of low temperature resistance of conventional progressing cavity pump rubber stator. According to the characteristics of the gap-seal spiral lifting of the stator and rotor,under the influence of various factors,there are problems such as the unclear gap leakage law and the imperfect optimization method of the stator and rotor. In view of this,through the establishment of a 2 ∶ 3 lobe progressing cavity pump solid model,according to the pressure distribution law in the progressing cavity pump,taking into account the influence of parameters such as temperature,pressure,medium viscosity and rotational speed,the finite element simulation method is used to analyze the stator and rotor leakage and contact wear law of the full metal progressing cavity pumping. With high pump efficiency and low contact pressure as the goal,the all-metal progressing cavity pump stator-rotor fit clearance is optimized: the gap is 0. 15 ～ 0. 30 mm when the medium viscosity is ≤0. 05 Pa·s,and the gap is 0. 20 ～ 0. 40 mm when the medium viscosity is >0. 05 Pa·s. The on-site application of 5 wells showed that the pump efficiency of the wells was increased by 15. 1% on average,the daily increase of single wells was 3. 13 tons,the average production cycle was 433 days,and the longest production cycle reached 542 days and continued to be effective. The research results meet the requirements of field application of all-metal progressing cavity pump,and it is of great significance to optimizing the design and performance.
All metal progressing cavity pump stator and rotor are made of metal material,and the working temperature reaches 400 ℃,which solves the problem of low temperature resistance of conventional progressing cavity pump rubber stator. According to the characteristics of the gap-seal spiral lifting of the stator and rotor,under the influence of various factors,there are problems such as the unclear gap leakage law and the imperfect optimization method of the stator and rotor. In view of this,through the establishment of a 2 ∶ 3 lobe progressing cavity pump solid model,according to the pressure distribution law in the progressing cavity pump,taking into account the influence of parameters such as temperature,pressure,medium viscosity and rotational speed,the finite element simulation method is used to analyze the stator and rotor leakage and contact wear law of the full metal progressing cavity pumping. With high pump efficiency and low contact pressure as the goal,the all-metal progressing cavity pump stator-rotor fit clearance is optimized: the gap is 0. 15 ～ 0. 30 mm when the medium viscosity is ≤0. 05 Pa·s,and the gap is 0. 20 ～ 0. 40 mm when the medium viscosity is >0. 05 Pa·s. The on-site application of 5 wells showed that the pump efficiency of the wells was increased by 15. 1% on average,the daily increase of single wells was 3. 13 tons,the average production cycle was 433 days,and the longest production cycle reached 542 days and continued to be effective. The research results meet the requirements of field application of all-metal progressing cavity pump,and it is of great significance to optimizing the design and performance.
引文
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[12]郑磊,吴晓东,岑学齐,等.不同配合方式螺杆泵的工作特性探讨[J].科学技术与工程,2018,18(11):67-73.ZHENG L,WU X D,CEN X Q,et al.Study on performance of PCPs in different fit modes[J].Science Technology and Engineering,2018,18(11):67-73.
[13]郑磊,吴晓东,韩国有,等.不同配合方式螺杆泵的工作特性探讨[J].石油机械,2018,46(5):79-82.ZHENG L,WU X D,HAN G Y,et al.Experimental simulation and evaluation of all metal progressive cavity pump performance[J].China Petroleum Machinery,2018,46(5):79-82.
[14]陈舟圣,刘志龙,杨万有,等.全金属螺杆泵工作特性实验研究[J].石油钻采工艺,2012,34(5):65-67.CHEN Z S,LIU Z L,YANG W Y,et al.Experimental research on characteristic of full metal screw pump[J].Oil Drilling&Production Technology,2012,34(5):65-67.
[15]WRIGHT D W.Progressive cavity pumps prove more efficient in mature waterflood tests[J].Oil and Gas Journal,1993,91(32):43-47.
[16]叶卫东,郭玉双,杜秀华,等.螺杆泵内部压力分布规律研究[J].科学技术与工程,2009,9(11):3069-3072.YE W D,GUO Y S,DU X H,et al.Study on pressure law inside of the progressive cavity pump[J].Science Technology and Engineering,2009,9(11):3069-3072.
[2]唐加礼,王铁君.螺杆泵在油田应用的可能性[J].石油钻采工艺,1989,11(2):111-115.TANG J L,WANG T J.Possibility of screw pump application in oil field[J].Oil Drilling&Production Technology,1989,11(2):111-115.
[3]张连山.螺杆泵采油系统技术发展现状与动向研究[J].石油机械,1994,22(1):46-50.ZHANG L S.Research on development status and trend of screw pump oil production system[J].China Petroleum Machinery,1994,22(1):46-50.
[4]BEAUQUIN J L,NDINEMENU F,CHALIER G,et al.World’s first metal PCP SAGD field test shows promising artificial-lift technology for heavy-oil hot production:Joslyn field case[R].SPE 110479,2007.
[5]WU B C,LI X.The special successful PCP applications in heavy oilfield[R].SPE 136817,2010.
[6]ROBELLO G,SAVETH K.Progressing cavity pump(PCP):new performance equations for optimal design[R].SPE 39786,1998.
[7]MORENO O B,MENA ROMERO M E.Integrated analysis for PCP systems[R].SPE 107879,2007.
[8]PALADINO EE,LIMA J A,ALMEIDA R F C.Computational modeling of the three-dimensional flow in a metallic stator progressing cavity pump[R].SPE 114110,2008.
[9]薛建泉,张国栋,吴慎渠,等.基于ANSYS的螺杆泵内部压力分布有限元分析[J].润滑与密封,2012,37(9):19-23.XUE J Q,ZHANG G D,WU S Q,et al.ANSYS finite element analysis of internal pressure distribution for progressing cavity pumps[J].Lubrication Engineering,2012,37(9):19-23.
[10]GAMBOA J,Olivet A,Espin S.New approach for modeling progressive cavity pumps performance[C]∥SPE Annual Technical Conference and Exhibition.Denver:[s.n.],2003.
[11]BEAUQUIN J L,BOIREAU C,LEMAY L,et al.Development status of a metal progressing cavity pump for heavy oil and hot production wells[R].SPE 97796,2005.
[12]郑磊,吴晓东,岑学齐,等.不同配合方式螺杆泵的工作特性探讨[J].科学技术与工程,2018,18(11):67-73.ZHENG L,WU X D,CEN X Q,et al.Study on performance of PCPs in different fit modes[J].Science Technology and Engineering,2018,18(11):67-73.
[13]郑磊,吴晓东,韩国有,等.不同配合方式螺杆泵的工作特性探讨[J].石油机械,2018,46(5):79-82.ZHENG L,WU X D,HAN G Y,et al.Experimental simulation and evaluation of all metal progressive cavity pump performance[J].China Petroleum Machinery,2018,46(5):79-82.
[14]陈舟圣,刘志龙,杨万有,等.全金属螺杆泵工作特性实验研究[J].石油钻采工艺,2012,34(5):65-67.CHEN Z S,LIU Z L,YANG W Y,et al.Experimental research on characteristic of full metal screw pump[J].Oil Drilling&Production Technology,2012,34(5):65-67.
[15]WRIGHT D W.Progressive cavity pumps prove more efficient in mature waterflood tests[J].Oil and Gas Journal,1993,91(32):43-47.
[16]叶卫东,郭玉双,杜秀华,等.螺杆泵内部压力分布规律研究[J].科学技术与工程,2009,9(11):3069-3072.YE W D,GUO Y S,DU X H,et al.Study on pressure law inside of the progressive cavity pump[J].Science Technology and Engineering,2009,9(11):3069-3072.