大牛地低渗气田气井携液气量低的原因分析
Analysis on the Reasons of Low Minimum Gas Rate for Liquid Unloading of Gas Well in Low Permeability Daniudi Gas Field
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- 引用格式:
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张文洪,郑峰,吴伟然,李克智,王志彬,刘岳龙,王锦昌.大牛地低渗气田气井携液气量低的原因分析[J].天然气与石油,2016,34(5):0.doi:
Zhang Wenhong, Zheng Feng, Wu Weiran, Li Kezhi, Wang Zhibin, Liu Yuelong, Wang Jinchang.Analysis on the Reasons of Low Minimum Gas Rate for Liquid Unloading of Gas Well in Low Permeability Daniudi Gas Field[J].Natural Gas and Oil,2016,34(5):0.doi:
- DOI:
- 作者:
- 张文洪1 郑 峰1 吴伟然1 李克智1 王志彬2 刘岳龙1 王锦昌1
Zhang Wenhong, Zheng Feng, Wu Weiran, Li Kezhi, Wang Zhibin, Liu Yuelong, Wang Jinchang
- 作者单位:
- 1.中石化华北分公司,2.西南石油大学油气藏地质及开发工程国家重点实验室
1.Sinopec Huabei Oilfield Company; 2.State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation Engineering, Southwest Petroleum University
- 关键词:
- 低渗气田；井筒积液:产液气井:连续携液:间歇带液
Low permeability gas field; Liquid loading; Water-producing gas well; Continuous removal liquid; Intermittent removal liquid
- 摘要:
- 气井积液对气井产能有影响。预测气井临界携液气流量的理论有Turner模型(系数6.5)、Coleman模型(系数5.5)、杨川东模型(系数大于6.5)、椭球模型(系数2.5)和球帽模型(系数2.25)等,各模型计算结果相差较大。我国渗透性较好的川南气田对前三个模型应用较多,但渗透性较差的大牛地、苏里格、靖边、涩北、川西等气田,则对椭球模型和球帽模型应用较多。对高、低渗气田临界携液气量存在差异的原因目前缺乏合理的解释,导致对气井携液及积液规律认识不准确。以大牛地气田为例,从井筒流型、流压梯度分布分析了低渗气田气井临界携液气流量分布范围,并与现有的连续携液模型进行比较,说明低渗气田临界携液气量的特点。同时从井筒积液对地层气相渗流率、气井产能及生产数据曲线波动特征的影响揭示了低渗气田连续携液临界气量低的原因。有助于提高对低渗气藏气井的携液规律的认识,对优化低渗气田气井的工作制度和提高气井生产管理水平有重要的参考意义。
Liquid loading affects gas well production. Theories for prediction of minimum flow rate for the continuous removal of liquids from gas wells include Turner model (coefficient is 6.5), Coleman model (coefficient is 5.5),Yang model (coefficient is bigger than 6.5), Li model (ellipsoidal) (coefficient is 2.5),Wang (ball cap) model (coefficient is 2.25) and etc. Various entrained droplet models have been developed to calculate minimum flow rate for keeping gas wells unloaded. The predicted minimum gas rate by these models differs greatly from each other. However, the former three models are used more than the latter two models in high production gas wells in Chuannan high permeability gas field. The latter two models are used more than the former three at low production gas wells in Daniudi, Sulige, Jinbian, Sebei, Chuanxi, which are low permeability gas fields. In the study, multiphase flow pattern and flowing pressure gradient distribution in tubing were analyzed to study the range of the minimum flow rate and compared it with the predicted values by these models. The effect of liquid loading on the gas permeability, gas production and gas production curve was analyzed to reveal the reason of low minimum flow rate in low permeability gas field. The study can help understand the regularity of liquid loading of gas well in low permeability reservoir, and is benefit for optimizing production and management for gas well in low permeability gas field.
