某銅礦難崩礦體水力壓裂試驗與效果評價(jià)
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紫金(長(cháng)沙)工程技術(shù)有限公司

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TD8

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Industrial Test and Effect Evaluation of Hydraulic Fracturing Technology of Block Caving in a Copper Mine
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Zijin (Changsha) Engineering Technology Co., Ltd

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    摘要:

    針對某銅礦難崩礦體水力壓裂試驗效果評價(jià)問(wèn)題,采用室內試驗、數值模擬和現場(chǎng)試驗等方法,室內測試了難崩礦體壓裂物模試驗,采用數值模擬研究了不同簇間距、不同施工排量、不同施工規模工況下壓裂裂縫擴展,進(jìn)行了地表裸眼和射孔兩種壓裂工藝的水力壓裂工業(yè)性試驗和監測。結果表明:礦體可壓性較好,具備形成多條復雜裂縫條件;數值模擬給出了水力壓裂施工排量在4~5m3/min范圍內,單段液量主體為200~450m3時(shí),能夠滿(mǎn)足40~70m裂縫半長(cháng)需求,并形成復雜裂縫網(wǎng)絡(luò );工業(yè)試驗兩井水力裂縫在礦體短軸方向上延伸偏短,整體上符合延伸規律,基本達到設計要求。相比裸眼井壓裂,射孔井壓裂由于采用多簇射孔+暫堵轉向(孔眼+縫內),形成水力裂縫更密集洋跺,監測縫長(cháng)明顯比設計縫長(cháng)短哪趟。該研究為礦山自然崩落法開(kāi)發(fā)和壓裂誘導提供了依據。

    Abstract:

    The efficacy of hydraulic fracturing in an refractory copper ore body was evaluated through a combination of laboratory testing, numerical simulation, and field trials. Indoor fracturing material simulation experiments were conducted on the refractory ore body. Numerical simulations were employed to investigate fracturing crack propagation under various cluster spacing, construction displacement, and scales. Surface open-hole and perforated fracturing techniques were tested and monitored on an industrial scale. The results indicate that the ore body has a favorable fracturability, possessing the potential to form multiple complex fractures. The numerical simulations suggest that a hydraulic fracturing construction displacement within the range of 4~5 m3/min and a single-stage fluid volume of 200~450 m3 are sufficient to meet the demands of fracture half-lengths of 40~70 m, resulting in complex fracture networks. Industrial trials revealed that hydraulic fractures in two wells extended shorter along the minor axis of the ore body, generally aligning with extension patterns and meeting design requirements. Compared to open-hole fracturing, perforated well fracturing, utilizing multi-cluster perforation plus temporary plugging and diversion (hole + fracture interior), produced denser hydraulic fractures, with monitored fracture lengths significantly shorter than the designed lengths. This provides a basis for the hydraulic development and fracturing induction of the natural caving method in metal mines.

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  • 收稿日期:2024-04-14
  • 最后修改日期:2024-06-25
  • 錄用日期:2024-07-01
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