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| 东胜致密低渗产水气藏水平井一点法产能模型研究 |
| Study on one-point productivity model of horizontal well in Dongsheng tight low permeability water producing gas reservoir |
| 投稿时间：2023-10-23 修订日期：2023-10-23 |
| DOI： |
| 中文关键词: 致密低渗气藏 水平井 流入动态 一点法产能 水气比 |
| 英文关键词: tight low permeability gas reservoir Horizontal well Inflow dynamics One-point productivity Water-air ratio |
| 基金项目:鄂尔多斯盆地南部中生界断缝体油藏开发关键技术 |
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| 中文摘要: |
| 东胜气田以水平井开发为主,具有致密、低渗、低产气、高产水特点。准确预测气井产能是配产优化、生产动态分析及排水采气的基础,而传统产能预测方法针对高含水气藏准确率低,为进一步提高高含水气藏产能预测精度,本文以东胜气田锦30井区作为研究对象,首先基于Borisov、Joshi、Giger、陈元千油藏水平井产能公式的推导过程,从渗流规律出发建立了气藏水平井产能公式；基于生产数据拟合得到气相渗透率与含水率的关系,分析不同水气比对流入动态曲线影响规律,发现不同水气比条件下的无因次流入动态曲线重合且为直线,但无阻流量受水气比影响较大,据此建立了无因次无阻流量与水气比的关系式,并在此基础之上建立了适用于锦30井区不同水气比条件下的一点法产能公式。通过3口修正等时试井资料进行验证,结果表明：平均相对误差为8.1%,模型具有较高准确性。本文的研究思路对同类低渗致密气藏产能预测方法研究具有参考意义。 |
| 英文摘要: |
| The Dongsheng Gas Field is mainly developed through horizontal wells, with characteristics of density, low permeability, low gas production, and high water production. Accurately predicting the production capacity of gas wells is the foundation of production optimization, production performance analysis, and drainage gas recovery. However, traditional production capacity prediction methods have low accuracy for high water content gas reservoirs. In order to further improve the accuracy of production capacity prediction for high water content gas reservoirs, this article takes the Jin30 well block of Dongsheng gas field as the research object. Firstly, based on the derivation process of horizontal well production capacity formulas for Borisov, Joshi, Giger, and Chen Yuanqian reservoirs, A productivity formula for horizontal wells in gas reservoirs was established based on the seepage law; Based on production data fitting, the relationship between gas phase permeability and water content was obtained. The influence of different water to gas ratios on inflow dynamic curves was analyzed. It was found that the dimensionless inflow dynamic curves under different water to gas ratios overlapped and were straight lines, but the open flow rate was greatly affected by the water to gas ratio. Based on this, the relationship between dimensionless open flow rate and water to gas ratio was established, On this basis, a one point method productivity formula suitable for different water gas ratios in Jin30 well area was established. Verified through three corrected isochronal well test data, the results show that the average error is 9.53%, and the model has high accuracy. The research ideas in this article have reference significance for the study of productivity prediction methods for similar low-permeability tight gas reservoirs. |
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