[1]張立俠  郭春秋.基于BWRS 狀態方程的天然氣偏差因子計算方法[J].石油鉆采工藝,2018,40(6):775-781.[doi:10.13639/j.odpt.2018.06.016]
 ZHANG Lixia,GUO Chunqiu.A calculation method for Z-factor of natural gas based on BWRS equation[J].Oil Drilling & Production Technology,2018,40(6):775-781.[doi:10.13639/j.odpt.2018.06.016]
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基于BWRS 狀態方程的天然氣偏差因子計算方法
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《石油鉆采工藝》[ISSN:1000-7393/CN:13-1072/TE]

卷:
40卷
期數:
2018年6期
頁碼:
775-781
欄目:
油氣開采
出版日期:
2018-11-20

文章信息/Info

Title:
A calculation method for Z-factor of natural gas based on BWRS equation
文章編號:
1000 – 7393( 2018 )06 – 0775 – 07
作者:
張立俠  郭春秋
中國石油勘探開發研究院
Author(s):
ZHANG Lixia GUO Chunqiu
PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
關鍵詞:
天然氣偏差因子狀態方程經驗關系迭代
Keywords:
natural gas Z-factor state equation empirical relationship iteration
分類號:
TE37
DOI:
10.13639/j.odpt.2018.06.016
文獻標志碼:
A
摘要:
天然氣偏差因子是油氣藏工程計算中的必要參數,在油氣勘探開發的諸多工程應用中起著重要作用。基于Starling 修正的Benedict-Webb-Rubin 狀態方程(BWRS 方程)和DAK 方法,對BWRS 方程中的指數項進行修正,利用非線性回歸分析, 提出了一種新的偏差因子計算方法,利用偏差因子標準數據對DAK、胡建國修正的DAK 方法及該新方法進行了對比。誤差分析結果表明:對于一般的溫度壓力范圍(1.05≤Tpr≤3.0 & 0.2≤ppr≤15)和相對高壓(1.4≤Tpr≤2.8 & 15≤ppr≤30)的情形(共7 148 組天然氣偏差因子數據),新方法的平均絕對誤差分別為0.382% 和0.205%,比DAK 方法和胡建國修正的DAK 方法的計算精度都要高。相對而言,DAK 方法在“1.1≤Tpr≤3.0 & 0.2≤ppr≤15”范圍內的計算精度較高,胡建國修正的DAK 方法只能用于相對高壓(1.4≤Tpr≤2.8 & 15≤ppr≤30)的情形,而新方法適用范圍更大(1.05 < Tpr≤3.0 & 0.2≤ppr≤15 以及1.4≤Tpr≤2.8 & 15≤ppr≤30)且計算效果更好。
Abstract:
Z-factor of natural gas is a necessary parameter in the calculation of reservoir engineering, and plays an important role in many engineering applications of oil and gas exploration and development. The exponential term in BWRS equation was modified based on the BWR equation modified by Starling and the DAK method. Then, a new Z-factor calculation method was developed by means of non-linear regression analysis. Finally, the DAK method, the DAK method modified by HU Jianguo and the new method were compared by using the standard data of Z-factor. The error analysis results indicate that in the situations with general temperature and pressure range (1.05≤Tpr≤3.0 & 0.2≤ppr≤15) and higher pressure (1.4≤Tpr≤2.8 & 15≤ppr≤30) (7 148 Z-factors of natural gas), the average absolute error of the new method is 0.382% and 0.205%, respectively, which are higher than the calculation accuracy of the DAK method and the DAK method modified by HU Jianguo. Comparatively, DAK method has higher calculation accuracy when pressure and temperature is in range of 1.1≤Tpr≤3.0 & 0.2≤ppr≤15, the DAK method modified by HU Jianguo is only applicable to higher pressure (1.4≤Tpr≤2.8 & 15≤ppr≤30), and the new method has wider applicable range (1.05<Tpr≤3.0 & 0.2≤ppr≤15以及1.4≤Tpr≤2.8 & 15≤ppr≤30) with higher calculation accuracy.

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