超深稠油注天然气气举降掺稀先导试验
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摘要
塔河油田稠油埋藏深(5 500～6 700 m)、黏度高(10~2~10~3Pa·s)、胶质沥青质含量高,开采难度大。针对常规稠油掺稀工艺存在稀油供应压力大、经济效益差的问题,提出了稠油注天然气气举降掺稀的方法。通过油气混溶室内实验和现场先导试验相结合开展了稠油注天然气气举降掺稀工艺技术研究。结果表明,对于井筒举升难度大的稠油,利用天然气的混溶降黏和气举双重功效,能够有效地提升稠油井筒流动性,降低掺稀量,提高稠油开发效率。开展先导试验的XD1井在试验期间稀稠质量比由试验前1. 27下降至0. 63,平均节约稀油50. 4%,累计节约稀油421. 7 t,累计增油205. 4 t,取得了较好降黏增油效果。
Because of the deep buried depth( 5 500-6 700 m),high viscosity( 102-103Pa·s) and high content of the asphaltene,it is difficult to develop for the heavy oil in Tahe Oilfield. In light of the problems of the big pressure of thin oil supply and poor economic benefit for the conventional heavy-oil viscosity reducing technology,the viscosity-reducing method of the heavy oil by the natural gas injection and lift was proposed. Through the combination of oil and gas miscible indoor experiment and field pilot test,the technical research on the viscosity reducing technology by heavy-oil natural gas injecting and lifting was conducted. The results show that for the difficulty of the heavy oil wellbore lift,with the help of the dual effects of the natural gas mixed solution-viscosity reduction and gas lift,the wellbore liquidity of the heavy oil can be effectively improved,the amount of the dilution can be reduced and the efficiency of the heavy oil development can be improved. During the pilot test,the ratio of the thin oil to heavy oil of Well XD1 decreased from 1. 27 to 0. 63,the average saved oil rate was 50. 4%,the accumulative total of the saved oil was up to 421. 7 t and cumulative incremental oil production reached 205. 4 t,so the effects of decreasing viscosity and increasing oil have achieved.
Because of the deep buried depth( 5 500-6 700 m),high viscosity( 102-103Pa·s) and high content of the asphaltene,it is difficult to develop for the heavy oil in Tahe Oilfield. In light of the problems of the big pressure of thin oil supply and poor economic benefit for the conventional heavy-oil viscosity reducing technology,the viscosity-reducing method of the heavy oil by the natural gas injection and lift was proposed. Through the combination of oil and gas miscible indoor experiment and field pilot test,the technical research on the viscosity reducing technology by heavy-oil natural gas injecting and lifting was conducted. The results show that for the difficulty of the heavy oil wellbore lift,with the help of the dual effects of the natural gas mixed solution-viscosity reduction and gas lift,the wellbore liquidity of the heavy oil can be effectively improved,the amount of the dilution can be reduced and the efficiency of the heavy oil development can be improved. During the pilot test,the ratio of the thin oil to heavy oil of Well XD1 decreased from 1. 27 to 0. 63,the average saved oil rate was 50. 4%,the accumulative total of the saved oil was up to 421. 7 t and cumulative incremental oil production reached 205. 4 t,so the effects of decreasing viscosity and increasing oil have achieved.
引文
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[2]吕佳祥.天然气对稠油物理性质的影响[J].新疆石油科技,1994,3(4):45-50.LJaxiang. Effect of natural gas on physical properties of heavy oil[J]. Xinjiang Petroleum Science&Technology,1994,3(4):45-50.
[3]王一平,孙业恒,吴光焕,等.超深层稠油二氧化碳吞吐渗流规律[J].特种油气藏,2017,24(4):142-146.WANG Yiping, SUN Yeheng, WU Guanghuan, et al. Permeability rule of CO2huff and puff for ultra-deep heavy oil reservoirs[J]. Special Oil&Gas Reservoirs,2017,24(4):142-146.
[4]刘曦懋,钟海全.委内瑞拉稠油气举新工艺[J].重庆科技学院学报(自然科学版),2013,15(2):64-66.LIU Ximao,ZHONG Haiquan. Heavy-oil gas lift new technology in Venezuela[J]. Journal of Chongqing University of Science and Technology(Natural Science Edition),2013,15(2):64-66.
[5] DOU HONG'En, CHANG Yuwen, HU Dandan, et al.Application of gas lift to heavy-oil reservoir in Intercampo Oilfield,Venezuela[C]//SPE International Thermal Operations and Heavy Oil Symposium SPE/PS-CIM/CHOA 97370 PS 2005-306,2005.
[6]李松林,张云辉,关文龙,等.超深层稠油油藏天然气吞吐试验改善效果措施研究[J].特种油气藏,2011,18(1):74-76.LI Songlin, ZHANG Yunhui, GUAN Wenlong, et al. Analysis and improvement of natural gas huff and puff pilot for extra deep heavy oil reservoir[J]. Special Oil&Gas Reservoirs,2011,18(1):74-76.
[7]穆金峰.鲁克沁油田超深稠油注天然气吞吐研究与应用[J].石油地质与工程,2010,24(5):115-118.MU Jinfeng. Ultra-deep heavy oil injection of natural gas throughput research and application[J]. Petroleum Geology and Engineering,2010,24(5):115-118.
[8]姜涛,肖林鹏,杨明强,等.超深层稠油油藏注天然气吞吐开发矿场试验[J].大庆石油地质与开发,2008,27(5):101-104.JIANG Tao,XIAO Linpeng, YANG Mingqiang, et al. Field test study on cyclic nature gas injection for ultra deep heavy oil reservoir[J]. Petroleum Geology&Oilfield Development in Daqing,2008,27(5):101-104.
[9]万海乔.深层稠油天然气吞吐增产技术实施效果评价[J].天然气与石油,2013,31(6):63-66.WAN Haiqiao. Evaluation on implementation effect of deep heavy oil and gas stimulation technology[J]. Natural Gas and Oil,2013,31(6):63-66.
[10]妥宏,马愉,糜娜,等.英2井深层稠油油藏注气吞吐降黏实验[J].新疆石油地质,2012,33(1):108-110.TUO Hong,MA Yu,MI Na,et al. Visbreaking experiment on Ying-2 Well deep heavy oil reservoir by gas injection stimulation process[J]. Xinjiang Petroleum Geology, 2012, 33(1):108-110.
[11]张琪.采油工程原理与设计[M].东营:石油大学出版社,2009:68-92.ZHANG Qi. Principle and design of petroleum production engineering[M]. Dongying:Petroleum University Press,2009:68-92.