大倾角厚煤层煤层气开采井型优化及布井方法

doi:10.13722/j.cnki.jrme.2018.0911

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摘要倾斜煤层与近水平煤层不同，不同倾斜部位煤层气井排采规律有明显差异。为了提高倾斜煤层煤层气采收率，考虑重力分异对倾斜煤层气开采的影响，对大倾角厚煤层的适用井型和布井方法进行优化研究。针对倾斜煤层不同构造位置的特点，结合气水分布与煤层气井产能规律，优选出适合不同构造位置的井型与布井方法并通过数值模拟进行验证。结果表明：构造高部位应在煤层顶部布置水平井；构造翼部顺煤层布置水平井，且水平井的跟端或趾端位于煤层底部；构造低部位可采用直井或“T”型井。井网布置时应在构造高部位和低部位增加井网密度，构造翼部相应减少井网密度。背斜煤层布井时采用“伞状井网”布井方式，单斜煤层布井时应沿煤层等高线布井，且排距由顶部和底部向翼部逐渐增大。

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	王超文1
	彭小龙1
	朱苏阳1
	孙晗森2
	张健2
	林亮2

关键词 ：采矿工程, 倾斜煤层, 气水分异, 煤层气, 井型优选, 布井方式, 数值模拟

Abstract：The wells at different positions have different production laws in the inclined coal seam, which is different from the flat seam. In order to enhance coalbed methane(CBM) recovery efficiency in the inclined seam， the well type and well pattern arrangement for the inclined coal seam were studied considering the effect of gravity differentiation. According to the characteristics of different structural positions of the inclined coal seam and combining gas-water distribution and well production laws，the well type and well pattern arrangement methods were optimized and verified by numerical simulation. The results show that the horizontal wells should be located at the top of the coal seam at the high position of the structure and along the inclined direction of the coal seam at the flank with the heel or the toe of the horizontal well lying at the bottom of the coal seam, and that vertical wells or T-shaped wells can be used in the low position of the struture. The well density should be increased at the high and low positions，and reduced at the structural wing. In anticline coal seam，umbrella-shaped well pattern is adopted. In monoclinic coal seam，well pattern can be arranged along the contour line of the coal seam，and the well row spacing increases gradually from both the top and the bottom to the wing.

Key words： mining engineering inclined coal seam gravitational differentiation coalbed methane well-type optimization well pattern arrangement numerical simulation

引用本文:

王超文1，彭小龙1，朱苏阳1，孙晗森2，张健2，林亮2. 大倾角厚煤层煤层气开采井型优化及布井方法[J]. 岩石力学与工程学报, 2019, 38(2): 313-320.
WANG Chaowen1，PENG Xiaolong1，ZHU Suyang1，SUN Hansen2，ZHANG Jian2，LIN liang2. Coalbed methane well-type optimization and well pattern arrangement for thick coal seam with a large dip angle. , 2019, 38(2): 313-320.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0911 或 http://www.rockmech.org/CN/Y2019/V38/I2/313

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