本文選題：遠(yuǎn)程采動(dòng)煤巖體 + 下保護(hù)層��； 參考：《中國礦業(yè)大學(xué)》2015年碩士論文

【摘要】：作為高瓦斯復(fù)雜煤層群開采的典型代表,淮南礦區(qū)在煤層群集約化開發(fā)及煤與瓦斯共采領(lǐng)域取得較大成功,卸壓煤層瓦斯地面井抽采也在部分礦井取得成功。本文以地面井采氣成功率高的丁集礦及試驗(yàn)井成功率相對較低的顧橋礦為研究對象,采用理論分析、數(shù)值實(shí)驗(yàn)與工程實(shí)踐相結(jié)合的方法,研究遠(yuǎn)距離下保護(hù)層采動(dòng)煤巖體卸壓變形移位規(guī)律、地面井的穩(wěn)定性分析與特種加固措施以及卸壓煤層瓦斯地面井和井下組成的立體抽采工程實(shí)踐。應(yīng)用FLAC3D軟件,模擬分析了遠(yuǎn)距離下保護(hù)層11-2煤層采動(dòng)造成的覆巖卸壓及變形移位規(guī)律、被保護(hù)層13-1煤層卸壓及變形移位規(guī)律及被保護(hù)層滲透性演化規(guī)律;模擬分析了地面井套管失穩(wěn)變形的擠壓破壞和剪切破壞兩種響應(yīng)機(jī)制,將煤層采面走向上看作半無限大平面問題,建立沿煤層傾向的模型,模擬了在采動(dòng)過程中不同位置處預(yù)設(shè)地面井的變形移位規(guī)律,揭示出鉆井在采動(dòng)影響下的破壞特征,合理選擇地面鉆井的位置,采用“G”級油井水泥固井來防止套管破斷。研究對象現(xiàn)場工程實(shí)踐表明,顧橋礦、丁集礦采用的地面鉆井、井下工作面高抽巷和走向鉆孔、采空區(qū)埋管、順層鉆孔和底抽巷穿層鉆孔及順槽穿層鉆孔等立體式抽采瓦斯與方法,使工作面瓦斯抽采率達(dá)到47.8~87.5%。提出了淮南礦區(qū)地面鉆井瓦斯抽采效果評價(jià)方法,得出丁集礦地面井是成功的,而顧橋礦地面井失敗,建議顧橋礦采用丁集礦試驗(yàn)成功的“G”級油井水泥固井方法來提高地面鉆井井身穩(wěn)定性。
[Abstract]:As a typical representative of high gas complex coal seam mining, Huainan mining area has achieved great success in the field of intensive development of coal seam group and comining of coal and gas. In this paper, the Dingji ore with high gas production success rate in surface wells and Guqiao mine with relatively low success rate in test wells are taken as the research objects. The method of combining theoretical analysis, numerical experiment and engineering practice is adopted in this paper. This paper studies the displacement law of pressure relief deformation of coal and rock mass in the mining of protected strata at a long distance, the stability analysis of surface wells and special reinforcement measures, and the practice of three-dimensional drainage engineering composed of surface and underground gas wells in relief coal seams. FLAC3D software is used to simulate and analyze the overburden pressure relief and deformation displacement caused by mining of protective layer 11-2 coal seam at a long distance, the pressure relief and deformation displacement law of protected layer 13-1 seam and the evolution law of permeability of protected layer. In this paper, two response mechanisms of casing instability deformation in surface wells are simulated and analyzed, such as extrusion failure and shear failure. The upward strike of coal seam face is regarded as a semi-infinite plane problem, and a model of coal seam inclination is established. The deformation and displacement law of preset ground wells at different positions in the course of production is simulated, the failure characteristics of drilling under the influence of production are revealed, the location of surface drilling is reasonably selected, and the cementing of "G" grade oil well cement is adopted to prevent casing breaking. The field engineering practice shows that the surface drilling used in Guqiao Mine and Ding Ji Mine, the high pumping roadway and directional drilling hole in underground working face, the buried pipe in goaf, The gas extraction rate of the working face is 47.8% and 87.5% through the three dimensional gas extraction methods, such as drilling along the bedding and bottom drainage roadway, and drilling through the trench in the same way. A method for evaluating the effect of gas drainage in Huainan mining area is put forward. It is concluded that the surface well of Ding Ji Mine is successful, but the ground well of Guqiao Mine has failed. It is suggested that the cementing method of "G" grade oil well cement, which was successfully tested by Ding Ji ore deposit, be used to improve the wellbore stability of surface drilling in Guqiao Mine.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD712.6

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