本文關(guān)鍵詞： 水力壓裂 卸壓增透 RFPA~(2D)-Flow 瓦斯?jié)舛?瓦斯流量　出處：《遼寧工程技術(shù)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本文主要采用理論分析,數(shù)值模擬以及現(xiàn)場(chǎng)實(shí)踐相結(jié)合的方法對(duì)馬堡礦水力壓裂卸壓增透技術(shù)進(jìn)行研究。通過(guò)力學(xué)相關(guān)理論對(duì)裂隙的形成,擴(kuò)展和延伸進(jìn)行了分析,根據(jù)馬堡礦實(shí)際地質(zhì)情況以及煤巖的力學(xué)參數(shù),應(yīng)用RFPA2D—Flow數(shù)值模擬軟件對(duì)水力壓裂過(guò)程進(jìn)行模擬,最后通過(guò)現(xiàn)場(chǎng)試驗(yàn)對(duì)馬堡礦15#煤層15108工作面進(jìn)行水力壓裂增透技術(shù)措施。在現(xiàn)場(chǎng)應(yīng)用中發(fā)現(xiàn),瓦斯抽采濃度和流量顯著提高,提高了煤層的透氣性,確定了適合馬堡礦的水力壓裂影響半徑,具體研究?jī)?nèi)容如下：首先,采用相關(guān)力學(xué)理論對(duì)原巖應(yīng)力,裂隙的類型,高壓水對(duì)裂隙的致裂機(jī)理以及裂隙的延伸和擴(kuò)展機(jī)理進(jìn)行分析,重點(diǎn)對(duì)注水前鉆孔圍巖應(yīng)力與滲透率變化關(guān)系以及注入高壓水后鉆孔的應(yīng)力分布和鉆孔周圍的應(yīng)力變化進(jìn)行分析。其次,根據(jù)馬堡礦的實(shí)際地質(zhì)特征以及煤巖物理力學(xué)參數(shù)建立模型,并用RFPA2D— Flow對(duì)水力壓裂過(guò)程進(jìn)行數(shù)值模擬,重點(diǎn)對(duì)煤體剪應(yīng)力場(chǎng),聲發(fā)射場(chǎng)以及水壓在鉆孔圍巖的分布規(guī)律進(jìn)行模擬,并分析了高壓水對(duì)煤體的破壞過(guò)程,以及裂隙的擴(kuò)展過(guò)程。最后,對(duì)水力壓裂增透技術(shù)在馬堡礦15108工作面進(jìn)行現(xiàn)場(chǎng)試驗(yàn),分別對(duì)水力壓裂增透技術(shù)實(shí)施前后的濃度和流量進(jìn)行監(jiān)測(cè)。通過(guò)比較發(fā)現(xiàn)：增透后的煤層瓦斯抽采濃度和流量都有了很大程度的提高,大大提高了煤層的透氣性。通過(guò)壓裂前后含水率以及壓裂區(qū)和非壓裂區(qū)瓦斯?jié)舛群土髁繉?duì)比,充分說(shuō)明水力壓裂增透技術(shù)的有效性及可行性,是增大高瓦斯低透氣性煤層透氣性,提高瓦斯抽采效果的重要舉措。
[Abstract]:In this paper, theoretical analysis, numerical simulation and field practice are used to study hydraulic fracturing and antireflection technology in Mabao Mine, and the formation, expansion and extension of fractures are analyzed through mechanics theory. According to the actual geological conditions and the mechanical parameters of coal and rock, the hydraulic fracturing process is simulated by RFPA2D-Flow numerical simulation software. In the end, hydraulic fracturing and antipenetration measures are carried out on 15108 face of No. 15# coal seam in Mabu Coal Mine. In the field application, it is found that the concentration and discharge of gas drainage are significantly increased, and the permeability of coal seam is improved. The influence radius of hydraulic fracturing is determined. The specific research contents are as follows: firstly, the relevant mechanics theory is used to analyze the stress and fracture types of the original rock. The mechanism of crack fracture and the mechanism of crack extension and extension are analyzed by high pressure water. The stress distribution of the borehole and the stress change around the borehole after injection of high pressure water are analyzed. According to the actual geological characteristics and the physical and mechanical parameters of coal and rock, the model is established, and the hydraulic fracturing process is numerically simulated by RFPA 2D-Flow, with emphasis on the shear stress field of coal body. The distribution law of acoustic emission site and water pressure in the surrounding rock of borehole is simulated, and the process of destruction of coal body by high pressure water and the process of crack expansion are analyzed. Finally, the field test of hydraulic fracturing antireflection technology is carried out in 15108 face of Mabu Coal Mine. The concentration and flow rate before and after the implementation of hydraulic fracturing antipermeation technology are monitored respectively. Through comparison, it is found that the concentration and flow rate of coal seam gas drainage have been increased to a great extent, The permeability of coal seam is greatly improved. By comparing water cut, gas concentration and flow rate between fracturing area and non-fracturing area, the effectiveness and feasibility of hydraulic fracturing antipermeability technology are fully demonstrated. It is an important measure to increase the permeability of high gas and low permeability coal seam and to improve the effect of gas drainage.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD712.6

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