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

Abstract

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

CLC Number:

TE377

Yongping JIANG,Song YANG. 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.

Figures/Tables 10

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References 23

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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

New technology of dewatering gas recovery for CBM wells in southern Yanchuan Block, eastern margin of Ordos Basin

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