基于启动压力下稠油油田合理产能及井距研究
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摘要
渤海稠油油田资源丰富,经过多年的海上探索开发,地层原油黏度小于400 m Pa·s的稠油油田也可通过注水有效开发,并取得了较好的开发效果。在开发过程中,由于稠油油藏存在启动压力,常规产能公式计算结果与实际偏差较大,无法准确描述油井合理产能;同时启动压力对井网中合理井距的确定也有一定影响,考虑启动压力时油井的动用半径与不考虑启动压力时相比,油井动用半径会缩小,因此在井网研究过程中,考虑启动压力对合理井距的确定至关重要。本文以渤海S油田为例,开展了稠油油田在注水开发过程中行列式井网合理井距研究,通过公式推导建立了稠油油藏考虑启动压力的定向井产能公式,并基于微元思想确定出距离定向井不同位置处流量贡献,根据S油田的物性及流体参数确定出S油田行列式井网开发中的合理井距,并进一步分析了不用原油黏度下油井的动用半径及合理产能。基于本文研究成果,在S油田开发调整中进行应用,并取得了较好的开发效果,本文研究方法也对渤海稠油注水开发油田定向井合理产能和合理井距的确定具有一定的借鉴意义。
Bohai heavy oilfield is rich in resources. After years of offshore exploration and development, heavy oilfields with formation viscosity less than 400 mPa·s can also be effectively developed by water injection, and good development results have been achieved. In the process of development, because of the threshold pressure of heavy oil reservoir, the calculation result of conventional productivity formula deviates greatly from the actual result,which cannot accurately describe the reasonable productivity of oil wells. At the same time,the threshold pressure has a certain influence on the determination of the reasonable well spacing in the well pattern, considering the operating radius of oil wells under threshold pressure and not considering the threshold pressure phase. In the process of well pattern study, it is very important to consider threshold pressure for determining reasonable well spacing. Taking Bohai S oilfield as an example, this paper studies the reasonable well spacing of determinant well pattern in the process of water flooding development in heavy oil-field, establishes the directional well productivity formula of heavy oil reservoir considering threshold pressure by formula deduction, and determines the flow contribution at different locations of directional well based on the thought of infinitesimal element.According to the physical properties and flow parameters of S oilfield,the reasonable well spacing in the development of determinant well pattern in S oilfield is determined, and the production radius and reasonable productivity of oil wells are further analyzed under different oil viscosity.Based on the research results of this paper, it has been applied in S oilfield development and adjustment, and has achieved good development results. The research method of this paper also has certain reference significance for the determination of reasonable directional well productivity and reasonable well spacing in heavy oil water flooding oilfield of Bohai.
Bohai heavy oilfield is rich in resources. After years of offshore exploration and development, heavy oilfields with formation viscosity less than 400 mPa·s can also be effectively developed by water injection, and good development results have been achieved. In the process of development, because of the threshold pressure of heavy oil reservoir, the calculation result of conventional productivity formula deviates greatly from the actual result,which cannot accurately describe the reasonable productivity of oil wells. At the same time,the threshold pressure has a certain influence on the determination of the reasonable well spacing in the well pattern, considering the operating radius of oil wells under threshold pressure and not considering the threshold pressure phase. In the process of well pattern study, it is very important to consider threshold pressure for determining reasonable well spacing. Taking Bohai S oilfield as an example, this paper studies the reasonable well spacing of determinant well pattern in the process of water flooding development in heavy oil-field, establishes the directional well productivity formula of heavy oil reservoir considering threshold pressure by formula deduction, and determines the flow contribution at different locations of directional well based on the thought of infinitesimal element.According to the physical properties and flow parameters of S oilfield,the reasonable well spacing in the development of determinant well pattern in S oilfield is determined, and the production radius and reasonable productivity of oil wells are further analyzed under different oil viscosity.Based on the research results of this paper, it has been applied in S oilfield development and adjustment, and has achieved good development results. The research method of this paper also has certain reference significance for the determination of reasonable directional well productivity and reasonable well spacing in heavy oil water flooding oilfield of Bohai.
引文
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[13]杜保健,周玉辉,等.反九点井网合理井距评价方法[J].重庆科技学院学报(自然科学版),2011,13(5):105-107.
[14]柴利文,唐清山.修正容积法确定稠油蒸汽吞吐开发的合理井距[J].特种油气藏,1998,5(2):28-32.
[15]崔传智,杨赤宸,牛栓文,等.复杂断块油藏高含水期合理井距确定方法及其影响因素[J].油气地质与采收率,2013,20(4):53-56.
[16]朱伟.低渗透油田合理井距确定方法研究——以N油田为例[J].石油地质与工程,2016,30(3):123-126.
[17]杨小平,等.动态分析法确定低渗透砂岩油藏合理井距[J].特种油气藏,2006,13(6):64-66.
[18]罗宪波,李波,刘英,等.存在启动压力梯度时储层动用半径的确定[J].中国海上油气,2009,21(4):248-249.
[19]郑力会,康晓东,蒋珊珊,等.油藏启动压力研究基础理论问题探讨[J].石油钻采工艺,2013,35(5):121-125.
[2]刘斌,杨静,张瑞,等.海上注水油田水淹规律分析软件在渤海某油田中的应用[J].石油化工应用,2017,36(1):106-110.
[3]龙明,许亚南,于登飞,等.渤海稠油底水油藏精细定量注水研究——以秦皇岛32-6油田西区为例[J].中国海上油气,2017,29(4):91-97.
[4]罗义科,张俊廷,张彩旗,等.渤海稠油注水开发油田提高采收率技术研究[J].长江大学学报(自科版),2016,13(29):59-63.
[5]柴世超,杨庆红,葛丽珍,等.秦皇岛32-6稠油油田注水效果分析[J].中国海上油气,2006,18(4):251-254.
[6]杨东东,吴春新,王刚,等.渤海天然能量开发砂岩油藏采收率经验公式研究[J].石油规划设计,2016,27(2):6-8.
[7]王飞琼,赵春明,程明佳,等.渤海油田开发过程控制及效果[J].中国海上油气,2012,24(6):34-37.
[8]张彩旗,刘东,潘广明,等.海上稠油多元热流体吞吐效果评价研究及应用[J].油气藏评价与开发,2016,6(2):33-36.
[9]刘光成.渤海稠油多元热流体吞吐技术研究[J].长江大学学报(自科版),2014,11(10):99-103.
[10]张雪峰,王新海,王羽,等.裂缝油藏合理井距数值模拟研究[J].江汉石油学院学报,2003,25(4):98-99.
[11]黄海波,凌建军,张方礼,等.齐40块蒸汽吞吐合理井距数值模拟研究[J].江汉石油学院学报,2001,23(S1):83-85.
[12]卢宝荣,任珠琳,肖建玲,等.段北油藏合理井距确定及调整技术对策研究[J].录井工程,2013,24(1):77-80.
[13]杜保健,周玉辉,等.反九点井网合理井距评价方法[J].重庆科技学院学报(自然科学版),2011,13(5):105-107.
[14]柴利文,唐清山.修正容积法确定稠油蒸汽吞吐开发的合理井距[J].特种油气藏,1998,5(2):28-32.
[15]崔传智,杨赤宸,牛栓文,等.复杂断块油藏高含水期合理井距确定方法及其影响因素[J].油气地质与采收率,2013,20(4):53-56.
[16]朱伟.低渗透油田合理井距确定方法研究——以N油田为例[J].石油地质与工程,2016,30(3):123-126.
[17]杨小平,等.动态分析法确定低渗透砂岩油藏合理井距[J].特种油气藏,2006,13(6):64-66.
[18]罗宪波,李波,刘英,等.存在启动压力梯度时储层动用半径的确定[J].中国海上油气,2009,21(4):248-249.
[19]郑力会,康晓东,蒋珊珊,等.油藏启动压力研究基础理论问题探讨[J].石油钻采工艺,2013,35(5):121-125.
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