3种常用页岩气井经验递减方法——以四川盆地威远区块为例

王科, 李海涛, 李留杰, 张庆, 补成中, 王志强

doi:10.11764/j.issn.1672-1926.2019.03.001

天然气地球科学 >

2019 , Vol. 30 >Issue 7: 946 - 954

DOI: https://doi.org/10.11764/j.issn.1672-1926.2019.03.001

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3种常用页岩气井经验递减方法——以四川盆地威远区块为例

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1.“油气藏地质及开发工程”国家重点实验室，西南石油大学，四川成都 610500；
2.延长石油集团研究院，陕西西安 710075；
3.中国石油集团川庆钻探工程有限公司，四川成都 610051

王科（1990-)，男，湖北黄冈人，博士研究生，主要从事页岩气井生产动态评价及压裂返排工艺研究.E-mail：490260359@qq.com.

收稿日期: 2019-01-27

修回日期: 2019-03-13

网络出版日期: 2019-08-07

基金资助

国家科技重大专项“水平井产气剖面评价与深度酸化研究”（编号：2016ZX05017005-006)资助.

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Research on three widely-used empirical decline methods for shale gas wells in Weiyuan block of the Sichuan Basin

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1.State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation，Southwest Petroleum University，Chengdu 610500，China；
2.Research Institute of Yanchang Petroleum (Group)Co.Ltd.，Xi’an 710075，China；
3.CNPC Chuanqing Drilling Engineering Co.Ltd.，Chengdu 610051，China

Wang Ke(1990-), Male, Doctoral candidate, Mainly engaged in shale gas well production dynamic evaluation and fracturing flowback technology research. E-mail：490260359@qq.com.

Received date: 2019-01-27

Revised date: 2019-03-13

Online published: 2019-08-07

Supported by

Supported by the China National Science and Technology Major Project “Research of the gas production profile evaluation and deep acidification in horizontal well” (Grant No. 2016ZX05017005-006).

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摘要

页岩气井的递减规律与常规气井有一定的区别，分析页岩气井递减规律对准确评价页岩气井储量至关重要。经验递减法因为操作简单、有效而被广泛使用，但每种方法都有自身的缺陷及适用性，笼统的使用难免会造成很大的误差。分析了页岩气井的递减规律及SEPD法、Duong法及WK法这3种最为常用方法的特点，发现SEPD法是Arps指数递减的延伸，WK法是Duong法的延伸；并详细地给出了这些方法的应用步骤，结合四川威远区块的大量页岩气井得到了这3种方法的适用条件：①SEPD法不适用于页岩气井；②只有当气井进入边界流后，才可使用Duong法或WK法准确预测估算最终储量(EUR)；③数据波动对传统Duong法、WK法影响非常大。最后改进了Duong法中参数q1的获取途径，消除了数据波动对Duong法的影响，避免了Duong法多解性的问题；与WK法的对比，改进Duong法要优于WK法。

关键词： 威远页岩气; 递减规律; 经验递减法; 适用性; 改进Duong法; 产量及EUR预测

本文引用格式

王科, 李海涛, 李留杰, 张庆, 补成中, 王志强 . 3种常用页岩气井经验递减方法——以四川盆地威远区块为例[J]. 天然气地球科学, 2019 , 30(7) : 946 -954 . DOI: 10.11764/j.issn.1672-1926.2019.03.001

Abstract

The diminishing law of shale gas well is different from that of conventional gas well，thus to analyze the diminishing law of shale gas well is important for shale gas well in accurate reserves evaluation.Empirical methods have been widely introduced in the industry owing to their simplicity and efficiency，but each method has its own disadvantages and applicability，and general use of them without pertinence will inevitably cause a big error.The diminishing law of shale gas well has been discussed，and three most widely used empirical methods，including SEPD，Duong’s method and WK’s method，have also been analyzed with their characteristics and application steps.Further research of the three methods revealed that SEPD is the improvement of Arps’s exponential decline and WK’s method is the improvement of Duong’s method.Examples have been implemented to find out the application condition：(1)SEPD is not suitable for shale gas wells；(2)Only when the well is in boundary flow can use Duong’s method or WK’ method to predict EUR；(3)The fluctuation of production will make big errors in reserves evaluation by Duong’s method or WK’ method.At last improvement in obtaining the parameter q1 of Duong’s method has been proposed to eliminate the big errors caused by production fluctuation and avoid the problem of the multiple solutions in Duong’s method successfully，application results have shown that the improved Duong’s method is better than Wk’s method in production and EUR estimation.

Key words： Shale gas wells in Weiyuan block; The diminishing law; Empirical methods; Application condition; The improved Duong’s method; Production and EUR estimation

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