裂缝性油藏抽汲井试井曲线特征
Well Testing Curve Characteristics of Swabbing Well in Fractured Reservoir
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- 引用格式:
-
刘洪,任路,胡治华.裂缝性油藏抽汲井试井曲线特征[J].天然气与石油,2011,29(5):0.doi:
.Well Testing Curve Characteristics of Swabbing Well in Fractured Reservoir[J].Natural Gas and Oil,2011,29(5):0.doi:
- DOI:
- 作者:
- 刘 洪1 任 路2 胡治华3
- 作者单位:
- 1.长江大学油气资源与勘探技术教育部重点实验室，2.冀东油田勘探开发研究院，3.中海油天津分公司
- 关键词:
- 裂缝性油藏；抽汲井；段塞流；窜流系数；储能比
Fractured reservoir；Swabbing well；Slug flow；Interporosity flow coefficient；Energy storage ratio
- 摘要:
- 抽汲作业在国内外油田上被广泛应用，是提高油藏开采速度的有力手段。抽汲井每抽恢复段压力曲线蕴含大量信息，研究抽汲井每抽恢复段试井曲线特征很有必要，同时由于裂缝的存在，裂缝特征参数对抽汲后恢复压力资料有显著影响。针对圆形封闭地层裂缝性油藏抽汲井段塞流数学模型，通过拉普拉斯变换和数值反演方法，求解得到了裂缝性油藏抽汲井井底压力，绘制了裂缝性油藏抽汲井井底压力双对数曲线，研究发现表皮系数只对双对数曲线早期产生影响，裂缝性油藏窜流导致抽汲井试井双对数曲线上出现一个台阶，窜流系数越大台阶越早出现，储能比越小台阶越明显。
The swabbing operation is an effective means for speeding up reservoir development rate and has been widely used in development of oil fields at home and abroad. Pressure curve of each recovery segment in swabbing well implicates a great deal of information and it is necessary to study well test characteristic curves of each recovery segment in swabbing well. At the same time，due to crack existence，crack characteristic parameters have a significant effect on pressure recovery after swabbing. Established is the mathematical model of slug flow in swabbing well in closed circular fractured formation oil reservoir，obtained is well bottom pressure of swabbing well in fractured oil reservoir by using Laplace transform and numerical inversion method and drawn is double logarithm curves of the well bottom pressure of swabbing well in fractured oil reservoir. Results obtained through research on the double logarithm curves show that skin coefficient has effect on the double logarithm curves only in the early stage，fluid channeling in fractured reservoir will result in a step in the double logarithm curves of the swabbing well test. The greater the fluid channeling coefficient，the sooner the step appears，the smaller the energy storage ratio and the more obvious the step.
