Theory and practice of plasma pulse technology for enhancing coalbed methane recovery
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摘要: 我国煤层气井产能瓶颈问题凸显，常规的储层改造措施大都具有破坏产层基质、裂缝延伸方向很难控制等特点。为探索一种更高效、更环保的储层改造技术，结合煤层气的成藏机制及产出机理，引进了处理方法简单高效的等离子脉冲技术，该技术在油气田上已取得了成功应用。依据等离子脉冲技术的工艺原理，在遵循一定的选井原则基础上，优选了晋城矿区寺河和郑庄区块的4口井，开展了该工艺技术适用性的试验。结果表明：等离子脉冲技术产生的周期性的宽频带波有助于激发煤储层系统内的共振效应，在原生裂隙的基础上发育大量的扩张裂隙网络，还能将产气通道及近井地带堵塞物剥离，增加储层渗透率。煤层气井生产实践进一步证实，应用等离子脉冲技术改造煤储层取得了良好的效果，该技术值得推广应用。Abstract: The capacity bottleneck of coalbed meathane wells in China is prominent. Conventional reservoir reconstruction measures mostly have the characteristics of destroying production matrix and controlling the direction of fracture extension. In order to explore a more efficient and environmentally friendly reservoir reconstruction technology, combining the formation mechanism and production mechanism of coalbed meathane, a simple and efficient plasma pulse technique is introduced, which has been successfully applied in oil and gas fields, and its treatment method is simple and efficient. Based on the principle of plasma pulse technology, 4 wells in Sihe and Zhengzhuang blocks in Jincheng mining area were optimized on the basis of a certain principle of well selection. The applicability of the technology has been tested. The results show that the periodic broadband wave produced by the plasma pulse technique helps to stimulate the resonance effect in the coal reservoir system. A large number of expansion fracture networks are developed on the basis of the primary fissure, and the gas channel and the near well zone blockage can be stripped to increase the reservoir permeability. Coalbed methane well production practice further confirmed that the application of plasma pulse technology for coal reservoir reconstruction has achieved good results, the technology is worthy of popularization and application.
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Keywords:
- plasma pulse /
- coalbed methane /
- reservoir reconstruction /
- recovery
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