天然气勘探与开发2026，Vol.49Issue(5)：102-110,9.DOI:10.12055/gaskk.issn.1673-3177.20250153
"一点法"气井产能评价校正系数β的确定
Determination of correction coefficient β of"one-point method"for gas well deliverability evaluation
摘要
Abstract
The conventional Chen's"one-point method"(C-OPM)for gas well deliverability evaluation is based on the binomial deliverability equation in pressure-squared form,adopting an average stabilized empirical coefficient(α)of 0.25 derived from 68 test points of 16 gas wells across 6 gas fields in China.However,this method exhibits significant calculation errors for high-yield gas wells with small drawdowns.To address the issue,a correction coefficient(β)and a new corrected deliverability calculation formula were derived based on the binomial deliverability equation and the C-OPM theory.Additionally,the relationships between gas production rate and the test-derived fitting parameters A and B,the ratio of drawdown to formation pressure(Δp/pR),and formation pressure(pR)were established.A comprehensive correction chart for OPM deliverability evaluation was developed using field data from 25 typical gas wells,and its calculation errors were compared with those of the C-OPM.The following results are obtained.(ⅰ)β is related to α and the ratio of gas well drawdown to formation pressure(γ).(ⅱ)When α＜0.25,β is less than 0.5;and when α＞0.25,β is generally below 1.2.(ⅲ)The procedure to determine the absolute open flow(qAOF)of wells involves calculating γ from formation pressure and bottom-hole flowing pressure obtained during well completion and oil testing,reading α from the primary axis of the correction chart using the gas production rate(qg),and then reading β from the secondary axis using γ and α.(ⅳ)The established corrected deliverability calculation formula yields more accurate evaluation results than the C-OPM,with the average relative error for 39 gas wells decreasing from 54.59%to 7.81%.It is concluded that,when α is not equal to 0.25,combining field test data with the correction chart is recommended to improve deliverability evaluation accuracy.关键词
校正系数/"一点法"/气井产能评价/试井/稳定经验数/便捷性/精度提高Key words
Correction coefficient/"One-point method"/Gas well deliverability evaluation/Well test/Stabilized empirical coefficient/Convenience/Accuracy improvement分类
能源科技引用本文复制引用
蔡珺君,张连进,张飞,毛正林,周芳芳,胡怡.."一点法"气井产能评价校正系数β的确定[J].天然气勘探与开发,2026,49(5):102-110,9.基金项目
国家科技重大专项项目"四川盆地深层超深层碳酸盐岩气藏勘探开发技术与集成示范"(编号:2025ZD1402500),中国石油西南油气田公司科技项目"薄层强非均质气藏跨尺度流动规律研究及气井稳产能力评价"(编号:25XNYTSC010). （编号:2025ZD1402500）
