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致密砂岩气藏产量分段递减规律特征
Study on the Law of production Segmentation Decline for Tight Gas Reservoir
李小雪1 黄小亮1 陈海涌2 周科3金大权2 王鹏鲲1
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DOI:
作者单位:1.重庆科技学院,重庆 401331;2.长庆油田第四采气厂,陕西西安,710021;3. 中石油煤层气有限责任公司,北京,100010
中文关键字:苏里格气田 致密砂岩气藏 产量递减 分段式 数学拟合 规律 预测
英文关键字:tight gas reservoir; production decline; segmentation; fitting; prediction
中文摘要:在气田的开发中,致密砂岩气藏由于孔隙度低、渗透率低,后期供给能量速度慢,从而造成气井初期产量高递减快、后期产量递减缓慢,其气藏的递减率不恒定,采用传统的方法进行计算容易出现递减率有偏差、极限累产预测不准等问题。为此,针对气井产量出现分段递减的原因主要有增产措施的采取、工作制度的调整和气井积液的影响等3 种因素,以传统的产量递减方法为基础,结合致密砂岩气藏的地质特征和动态开发特征,提出了产量分段递减分析方法,并根据致密砂岩气藏的生产数据,采用典型曲线拟合法制定了分段临界点的标准。现场应用结果表明:①分段递减方法在生产数据的拟合率、累产气和动态储量等3个指标的误差中均小于一段式递减法,且该方法计算简单,结果可靠;②有效解决了致密砂岩气藏递减率变化的问题;③产量分段递减方法对致密砂岩气藏的开发具有一定的适用性和指导作用。
英文摘要:In the development of gas fields, due to the low porosity and low permeability of tight gas reservoirs, the energy supply rate is slow at the later stage, resulting in a rapid decline in the initial production of gas wells, and a slow decline in production at the later stage. The decline rate of gas reservoirs is not constant. The traditional production decrement method is used for calculation, which is prone to problems such as deviation of declining rate and inaccurate prediction of recoverable reserves. In this paper, based on the traditional yield reduction method, combined with the geological characteristics and dynamic development characteristics of tight gas reservoirs, the yield segmentation analysis method is proposed. According to the production data of tight gas reservoirs, the standard of segmentation critical point is established by typical curve fitting method. The method is applied to the actual field. The results of on-site application show that the segmentation decrement is less than the one-step decrement in the error of the fitting rate of production data, the cumulative gas production and the dynamic reserve, and the method is simple. The results are reliable and have certain guiding significance for the development of such gas reservoirs.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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