许耀波. 煤层气井合层开发层间干扰分析与合采方法探讨——以平顶山首山一矿为例[J]. 煤田地质与勘探, 2021, 49(3): 112-117, 127. DOI: 10.3969/j.issn.1001-1986.2021.03.014
引用本文: 许耀波. 煤层气井合层开发层间干扰分析与合采方法探讨——以平顶山首山一矿为例[J]. 煤田地质与勘探, 2021, 49(3): 112-117, 127. DOI: 10.3969/j.issn.1001-1986.2021.03.014
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XU Yaobo. Analysis of interlayer interference in combined development of coalbed methane wells and discussion on combined production methods: A case study of Shoushan No.1 Coal Mine in Pingdingshan[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(3): 112-117, 127. DOI: 10.3969/j.issn.1001-1986.2021.03.014
Citation: XU Yaobo. Analysis of interlayer interference in combined development of coalbed methane wells and discussion on combined production methods: A case study of Shoushan No.1 Coal Mine in Pingdingshan[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(3): 112-117, 127. DOI: 10.3969/j.issn.1001-1986.2021.03.014
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煤层气井合层开发层间干扰分析与合采方法探讨——以平顶山首山一矿为例

Analysis of interlayer interference in combined development of coalbed methane wells and discussion on combined production methods: A case study of Shoushan No.1 Coal Mine in Pingdingshan

    摘要
  • 摘要: 多煤层合层开发是提高煤层气井单井产量的关键技术，然而工程实践中大部分煤层合采存在层间干扰问题，致使合采产气量提升不明显。为了提高合层开发煤层气井的产气量与开发效率，以平顶山首山一矿煤层气合采四2煤层和二1煤层为例，基于煤层气赋存的地质条件，分析了合采层间干扰的影响因素及干扰规律，并提出了煤层合层开发层间干扰的控制方法。结果表明：造成四2煤层和二1煤层合层排采产量低的主要因素是储层压力梯度、临界解吸压力和渗透率。其中，两层煤的储层压力梯度分别为1.05 MPa/hm和0.519 MPa/hm；渗透率分别为0.25×10–3 μm2和1.4×10–5 μm2；临界解吸压力分别为1.16~1.69 MPa和0.40~0.46 MPa；另外，两煤层间距大，平均170 m左右。以上主要影响因素差异，造成两层煤合采时层间矛盾突出，干扰严重，总体产量低，井组煤层气开发效率低。基于现状问题，探索提出大间距多煤层大井眼双套管分层控制合采工艺方法，以实现两层煤分开控制达到合采产能叠加的目标，从而提高煤层气井合采产量和开发效果。研究认识将为平顶山及类似地质条件的矿区多煤层煤层气高效合层排采提供新的技术途径。

     

    Abstract: The combined development of multiple coal seams is a key technology to increase the production of single CBM wells. However, in engineering practice, most coal seams have interlayer interference problems, resulting in an insignificant increase in combined development gas production. In order to improve the gas production and development efficiency of combined development in coalbed methane wells, taking the combined production of coalbed methane in the No.4-2 coal seam and the No.2-1 coal seam of the Shoushan No.1 Coal Mine in Pingdingshan as an example, this paper analyses the influence factors and interference rules of interlayer interference, and proposes the control methods of interlayer interference, based on the geological conditions of CBM deposits. The results show that the main factors causing the low multi-coal seam drainage production of the two coal seams are the reservoir pressure gradient, critical desorption pressure and permeability. Among them, the reservoir pressure gradients of the two coal seams are 1.05 MPa/hm and 0.519 MPa/hm respectively; the permeability are 0.25×10–3 μm2 and 1.4×10–5 μm2 respectively; the critical desorption pressures are 1.16-1.69 MPa and 0.40-0.46 MPa respectively; in addition, the distance between the two coal seams is large, about 170 m on average. The differences in the above-mentioned main influence factors result in prominent interlayer contradictions and serious interference, causing low overall production and low efficiency of CBM development in the well group. Based on the current problems, this paper explores and proposes a large-spacing, multi-coal seam, large borehole and double-casing layered control co-production method to achieve the goal of combined production capacity with separate control of two coal seams, so as to improve the combined production and development effects of CBM wells. The research results will provide a new technical approach for efficient drainage of the multi-coal seam development in Pingdingshan and other mining areas with similar geological conditions.

     

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