鄂尔多斯盆地东缘延川南区块煤层气井排水采气新工艺

doi:10.13809/j.cnki.cn32-1825/te.2021.03.013

摘要/Abstract

摘要：

深部煤层气作为典型的低压、低渗、低含水非常规气藏,需通过有效支撑压裂改造才能取得良好的开发效果,气井在全生命周期内产液量差异较大。基于延川南煤层气勘探开发区块不同井型煤层气采收的效果比较,认为L型水平井建井成本和3口定向井成本相近,但是产量更高,后期运行维护成本更低,更适合山区地带煤层气的开发。对比不同举升工艺特性,优选抽油机、强制闭合弹簧式斜井泵组合,实现了L型水平井全生命周期内排水采气工作。在产液量低的气井中,采用捞水采气工艺在小井斜,受积液、煤粉影响大的气井中取得良好增产效果,原有机采设备实现资产高效利用,节约外购材料费用,降低能耗指标,对气田下步低产液井排水采气工作具有借鉴意义。

关键词: 煤层气, 全生命周期, 排水采气, 水平井, 捞水

Abstract:

As a typical unconventional gas reservoir with low pressure, permeability and water cut, deep coalbed methane needs effective support fracturing to achieve good development effects, leading to large difference of liquid production in the whole life cycle of gas wells. Based on the comparison of coalbed methane recovery effect of different well types in Yanchuan South coalbed methane exploration and development block, it is considered that although the L-shaped horizontal well has the construction cost similar to that of three directional wells, but its production is higher and post-operation and maintenance cost is lower. It is more suitable for coalbed methane development in mountainous areas. By comparing the characteristics of different lifting processes, the combination of pumping unit and forced closed spring inclined well pump is optimized, and the drainage and gas recovery in the whole life cycle of L-shaped horizontal well is realized. In the gas wells with low liquid production, the technology of water drainage gas recovery has achieved good stimulation effects in the gas wells with small deviation, and high influence of liquid accumulation and pulverized coal. The existing mechanical production equipments can realize the efficient utilization of assets, save the cost of purchased materials, reduce the energy consumption index, and provide referential significance for the further drainage gas production in low liquid production wells.

Key words: coalbed methane, life cycle, dewatering gas recovery, horizontal well, drainage

中图分类号:

TE377

蒋永平,杨松. 鄂尔多斯盆地东缘延川南区块煤层气井排水采气新工艺[J]. 油气藏评价与开发, 2021, 11(3): 384-389.

JIANG Yongping,YANG Song. New technology of dewatering gas recovery for CBM wells in southern Yanchuan Block, eastern margin of Ordos Basin[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(3): 384-389.

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井型	单井成本构成（万元）
井型	钻前施工	钻井工程	压裂工程	机抽投产	运行维护	合计
定向井	3	117	113	25	6.0	264.0
L型水平井	10	488	511	45	5.0	1 059.0
U型水平井	20	605	511	45	2.5	1 183.5

方式	经济性	适应性			操作性
方式	经济性	井斜	煤粉	液量	操作性
管式泵	成本低	较好	好	好	简便
杆式泵	成本低	较好	差	差	简便
螺杆泵	成本低	较差	差	差	简便
电潜泵	成本高	好	差	好	较难
射流泵	成本高	好	差	差	难
隔膜泵	成本高	好	好	差	较难

型号	公称直径（mm）	柱塞长度（m）	泵筒长度（m）	最大下泵深度（m）
25-125TH	31.75	1.2	3.3~11.3	3 000
25-150TH	38.10	1.2	3.3~11.3	2 800
25-175TH	44.45	1.2	3.3~11.3	2 600
25-225TH	57.15	1.2	3.3~11.3	1 800