南川区块平桥地区页岩气井生产阶段划分与合理生产方式研究

doi:10.13809/j.cnki.cn32-1825/te.2022.03.010

摘要/Abstract

摘要：

在不同的生产阶段采取对应的生产方式是实现页岩气高效生产的有效手段。南川区块平桥背斜南区为常压页岩气,产量和井口压力相对较低,需要进一步优化生产方式。为此,通过分析平桥背斜南区30口常压页岩气井不同阶段生产特征,总结合理的生产方式。研究表明：平桥背斜南区常压页岩气井可划分为控压生产、提产携液、间歇生产、增压开采和低压低产5个生产阶段。在控压生产阶段按“保压+排液”原则,采用井下油嘴生产方式提高自喷生产周期;在提产携液阶段取出井下油嘴提产带液,防止气井积液;在间歇生产阶段采用气举、泡排等措施提高气井携液能力;在增压开采阶段采用压缩机地面增压,降低管输压力的影响;在低压低产阶段采用射流泵等低成本排水采气工艺。通过细分页岩气井生产阶段,采取合理生产方式,在平桥背斜南区常压页岩气井取得较好效果,可为盆缘复杂构造区常压页岩气开发提供借鉴。

关键词: 页岩气, 生产特征, 生产阶段, 生产方式, 常压, 南川区块

Abstract:

It is an effective way to realize efficient production of shale gas to adopt corresponding production mode in different production stages. The southern area of Pingqiao anticline in Nanchuan Block is a normal pressure shale gas reservoir with relatively low production and wellhead pressure, so the production mode needs to be further optimized. By analyzing the production characteristics of 30 wells in different stages in the southern area of Pingqiao, the reasonable production mode is summarized. The results show that the shale gas well can be divided into five production stages: pressure control, production increase and liquid carrying, intermittent production, pressurized production and low pressure and low production. In the stage of pressure control production, the principle of “keeping pressure + discharging liquid” is adopted to run downhole choke to improve the production cycle. The downhole choke is taken out to prevent the gas well from accumulating liquid in the stage of increasing production and carrying liquid. Measures such as gas lift, foam drainage are adopted in the intermittent production stage. Compressor is used to reduce the influence of pipeline gas transmission pressure in the pressurization stage. Low cost drainage technology such as jet pump is adopted in the stage of low pressure and low production. The mode has achieved good application effect in the south area of Pingqiao, which can provide reference for the development of normal pressure shale gas reservoir in the complex structural area of basin margin.

Key words: shale gas, production characteristics, production stages, mode of production, normal pressure, Nanchuan Block

中图分类号:

TE371

房大志,马伟竣,谷红陶,卢比,胡春锋. 南川区块平桥地区页岩气井生产阶段划分与合理生产方式研究[J]. 油气藏评价与开发, 2022, 12(3): 477-486.

FANG Dazhi,MA Weijun,GU Hongtao,LU Bi,HU Chunfeng. Research on production stage division and reasonable production mode of shale gas well in Pingqiao area of Nanchuan Block[J]. Petroleum Reservoir Evaluation and Development, 2022, 12(3): 477-486.

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深度（m）	正常生产		水淹前
深度（m）	流态	流压梯度（MPa/hm）	流态	流压梯度（MPa/hm）
30	环流-雾状流	0	环流-雾状流
500		0.19		0.11
1 000		0.21		0.09
1 400		0.18		0.15
1 700	环流-雾状流	0.08	段塞-环状过渡流	0.35
2 000		0.16		0.21
2 400		0.27		0.45
2 700	环流-雾状流	0.35	段塞流	0.65
2 900		0.14		0.31
3 100		0.07		0.71
3 200		0.06		0.75
3 300		0.22		0.82