發(fā)布時間：2018-02-14 07:22

  本文關鍵詞： 煤巖層 割理系統(tǒng) 等效巖石力學參數(shù) 裂縫擴展 裂縫形態(tài)　出處：《西南石油大學》2015年碩士論文　論文類型：學位論文

【摘要】：煤巖層非均質(zhì)性較強、割理系統(tǒng)發(fā)育、地質(zhì)特征獨特,是典型的低孔、低滲、裂縫性儲層。煤巖層氣井壓裂施工中出現(xiàn)砂比低、施工壓力波動劇烈、易出現(xiàn)砂堵等現(xiàn)象,這與煤巖層水力裂縫擴展形態(tài)緊密相關�？紤]到煤巖層獨特的地質(zhì)與工程特征,其水力裂縫擴展規(guī)律不能參照常規(guī)及其他非常規(guī)油氣藏,目前國內(nèi)外關于煤巖層水力壓裂裂縫擴展規(guī)律的研究還不夠完善,有必要進一步開展此類研究。 本論文基于流體力學、斷裂力學力學和滲流力學的相關理論認識,結合煤巖層孔滲特征、濾失特征、割理系統(tǒng)等因素,分析研究煤巖層壓裂裂縫擴展形態(tài)變化規(guī)律,研究主要分為三部分：論文建立了等效巖石力學參數(shù)模型,表征煤巖層非連續(xù)性；采用復變函數(shù)法求取煤巖層復合裂紋應力強度因子,并建立了復合裂紋擴展判據(jù)與水力裂縫天然裂縫相交判定準則；考慮割理系統(tǒng)與應力敏感性對煤巖層濾失的影響,建立了煤巖層濾失模型,在此基礎上建立了煤巖層水力裂縫擴展模型進而對水力裂縫在煤巖層中的擴展機理進行了深入的研究,分析了施工參數(shù)、天然裂縫參數(shù)、巖石力學參數(shù)及割理特性對煤巖層裂縫擴展形態(tài)的影響規(guī)律。 根據(jù)上述理論研究可知,煤巖層與常規(guī)及其他非常規(guī)油氣藏在壓裂液濾失與裂縫擴展形態(tài)等方面具有較為明顯的差異,本論文研究為煤巖層水力裂縫擴展規(guī)律及水力裂縫形態(tài)的精細化研究提供了一定的理論指導。
[Abstract]:The coal and rock strata are characterized by strong heterogeneity, developed cleat system and unique geological characteristics. They are typical low porosity, low permeability and fractured reservoirs. The phenomena of low sand ratio, severe fluctuation of operation pressure and easy sand plugging are found in the fracturing of coal and rock formation gas wells. This is closely related to the formation of hydraulic fractures in coal and rock formations. Considering the unique geological and engineering characteristics of coal and rock formations, the rules of hydraulic fracture propagation cannot be referred to conventional or other unconventional reservoirs. At present, the research on fracture propagation law of coal formation hydraulic fracturing is not perfect at home and abroad, so it is necessary to further develop this kind of research. Based on the related theories of fluid mechanics, fracture mechanics and percolation mechanics, this paper analyzes and studies the variation law of fracture propagation and morphology of coal bed fracturing by combining the characteristics of pore and permeability of coal and rock formation, filtration characteristics, cleat system and so on. The research is mainly divided into three parts: the equivalent rock mechanics parameter model is established to characterize the discontinuity of coal strata, the complex variable function method is used to calculate the stress intensity factor of coal rock stratum composite crack, The intersecting criterion of complex crack propagation criterion and hydraulic fracture natural fracture is established, considering the influence of cleat system and stress sensitivity on coal bed filtration, a coal bed filtration model is established. On the basis of this, the hydraulic crack propagation model of coal and rock bed is established, and the mechanism of hydraulic crack propagation in coal bed is studied deeply. The construction parameters and natural fracture parameters are analyzed. The influence of rock mechanical parameters and cleat characteristics on fracture propagation morphology of coal strata. According to the above theoretical study, there are obvious differences in fracturing fluid filtration and fracture propagation morphology between coal and rock formations and conventional and other unconventional reservoirs. This paper provides some theoretical guidance for the detailed study of hydraulic fracture propagation law and hydraulic fracture morphology of coal bed.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE357.1

【參考文獻】

相關期刊論文 前10條

1 唐書恒;朱寶存;顏志豐;;地應力對煤層氣井水力壓裂裂縫發(fā)育的影響[J];煤炭學報;2011年01期

2 李勇明,郭建春,趙金洲,吳小慶,李婭;裂縫性氣藏壓裂液濾失模型的研究及應用[J];石油勘探與開發(fā);2004年05期

3 何應付;李劍;楊正明;張訓華;;雙重介質(zhì)油藏壓力動態(tài)分析的邊界元方法[J];石油勘探與開發(fā);2006年04期

4 趙海峰;陳勉;金衍;丁云宏;王永輝;;頁巖氣藏網(wǎng)狀裂縫系統(tǒng)的巖石斷裂動力學[J];石油勘探與開發(fā);2012年04期

5 楊麗娜,陳勉;水力壓裂中多裂縫間相互干擾力學分析[J];石油大學學報(自然科學版);2003年03期

6 湯達禎,秦勇,胡愛梅;煤層氣地質(zhì)研究進展與趨勢[J];石油實驗地質(zhì);2003年06期

7 周健;陳勉;金衍;張廣清;;裂縫性儲層水力裂縫擴展機理試驗研究[J];石油學報;2007年05期

8 陳勉;周健;金衍;張廣清;;隨機裂縫性儲層壓裂特征實驗研究[J];石油學報;2008年03期

9 鮮保安,高德利,陳彩紅,王憲花;煤層氣高效開發(fā)技術[J];特種油氣藏;2004年04期

10 張士誠;牟松茹;崔勇;;頁巖氣壓裂數(shù)值模型分析[J];天然氣工業(yè);2011年12期

，

本文編號：1510171