窄河道致密砂岩气藏产能评价方法研究
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摘要
ZJ气田沙溪庙组气藏具有河道窄、砂体薄、储层致密的特征,前期采用陈元千"一点法"经验公式(α=0.25)计算无阻流量与系统产能测试相比数值普遍偏小,需建立相应的产能评价方法。基于压力恢复试井资料,采用解析分析以及数值模拟方法对ZJ气田多口井进行研究。通过对气井进行系统产能试井模拟,回归建立了气井二项式产能方程,并对该区气井"一点法"经验公式进行了校正。校正后的"一点法"产能公式更加合理,气井产能评价精度提高了10%,为窄河道致密砂岩气藏合理高效开发提供了依据。
The Shaximiao gas reservoir in Zhongjiang gasfield has the characteristics of narrow rivers, thin sand body and tight reservoir. The open-flow potential of the gas well calculated by the technology of one-point well testing(α=0.25) which was proposed by Chen Yuanqian is generally lower than its actual productivity, so it is necessary to establish a new method for productivity evaluation of Zhongjiang gasfield now. In this paper, based on data of pressure recovery well test, multiple wells in the Zhongjiang gasfield were studied by analytical and numerical simulation. Through the simulation of production test of the gas well,the binomial productivity equation was established and the α value of one-point well testing formula in this area was corrected. The corrected formula of one-point well testing technique is more reasonable, and the accuracy of productivity evaluation of the gas well is improved by 10 %, which provides a basis for the rational and efficient development of tight sandstone gas reservoirs with thin and narrow rivers.
The Shaximiao gas reservoir in Zhongjiang gasfield has the characteristics of narrow rivers, thin sand body and tight reservoir. The open-flow potential of the gas well calculated by the technology of one-point well testing(α=0.25) which was proposed by Chen Yuanqian is generally lower than its actual productivity, so it is necessary to establish a new method for productivity evaluation of Zhongjiang gasfield now. In this paper, based on data of pressure recovery well test, multiple wells in the Zhongjiang gasfield were studied by analytical and numerical simulation. Through the simulation of production test of the gas well,the binomial productivity equation was established and the α value of one-point well testing formula in this area was corrected. The corrected formula of one-point well testing technique is more reasonable, and the accuracy of productivity evaluation of the gas well is improved by 10 %, which provides a basis for the rational and efficient development of tight sandstone gas reservoirs with thin and narrow rivers.
引文
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[3]王丽英,王琳,张渝鸿,等.川西地区侏罗系沙溪庙组储层特征[J].天然气勘探与开发,2014,37(1):1-4.
[4]陈元千.确定气井绝对无阻流量的简单方法[J].天然气工业,1987,(1):1-5.
[5]张培军,唐玉林.一点法公式在川东气田的应用及校正[J].天然气勘探与开发,2004,27(2):24-25.
[6]杨丽娟,赵勇,詹国卫.元坝长兴组气藏一点法产能方程的建立[J].天然气技术与经济,2013,(3):17-20.
[7]张晶,牟小清,邱玲.川西深层“一点法”产能试井公式的校正[J].油气井测试,2011,20(5):19-20.
[8]方军成,王念喜,尹超.大牛地气田一点法产能结果评价[J].天然气工业,2007,27(12):121-123.
[9]王念喜,王香增,张丽霞,等.基于渗流特征的低渗透致密砂岩气藏气井生产规律[J].天然气工业,2009,29(4):82-85.
[10]何同均,李颖川.特低渗气藏水平井一点法产能测试理论分析[J].钻采工艺,2010,33(1):40-42.
[11]朱文娟.低渗气藏数值模拟产能评价法研究[J].长江大学学报(自科版),2017,(7):8+91-94.
[12]廖华伟,唐海,帅永乾,等.利用压恢资料确定低孔低渗气井产能方程的方法[J].油气井测试,2007,16(5):8-9.
[13]穆林,王丽丽.致密低渗气藏压裂水平井数值模拟[J].石油钻采工艺,2010,32(s1):127-129.
[14]马强.低渗气田修正等时试井分析的改进方法[J].油气井测试,2011,20(5):24-26+29+76.
[15]李晓平,张烈辉,刘启国.试井分析方法[M].北京:石油工业出版社,2009.
[16]庄惠农.气藏动态描述和试井[M].北京:石油工业出版社,2004.