本文關(guān)鍵詞：基于分步有限元法的多級(jí)壓裂過程中套管應(yīng)力敏感性分析　出處：《科學(xué)技術(shù)與工程》2017年16期 　論文類型：期刊論文

  更多相關(guān)文章： 頁(yè)巖氣 水力壓裂 分步有限元分析 套管

【摘要】：目前中國(guó)四川地區(qū)頁(yè)巖氣開發(fā)大多采用大排量分段壓裂工藝技術(shù),部分頁(yè)巖氣井在施工過程中出現(xiàn)套管變形的現(xiàn)象,導(dǎo)致后續(xù)施工改造無法順利進(jìn)行,嚴(yán)重影響了頁(yè)巖氣井的正常生產(chǎn)。因此準(zhǔn)確了解壓裂過程中套管應(yīng)力的變化規(guī)律具有重要意義。區(qū)別于傳統(tǒng)模型,基于分步有限元方法,考慮了鉆井、完井、壓裂整個(gè)施工過程,構(gòu)建了頁(yè)巖各向異性下套管-水泥環(huán)-地層組合體有限元分析模型,模擬多級(jí)壓裂過程中組合體應(yīng)力以及溫度場(chǎng)隨時(shí)間的變化特征。分析了兩種模型下注液溫度、套管內(nèi)壓、地應(yīng)力變化、地層孔隙壓力變化、水泥環(huán)彈性模量以及地層彈性模量等因素對(duì)套管受力狀態(tài)的影響。研究結(jié)果表明:(1)壓裂過程中,采用傳統(tǒng)模型會(huì)低估套管應(yīng)力的增大程度;(2)大排量壓裂施工過程中,井筒內(nèi)溫度震蕩變化,注液溫降導(dǎo)致套管應(yīng)力明顯升高;(3)地應(yīng)力分均勻性以及孔隙壓力的增大會(huì)導(dǎo)致套管應(yīng)力有所增加;(4)頁(yè)巖各向異性對(duì)套管應(yīng)力的影響較小,其中地層性質(zhì)的下降會(huì)導(dǎo)致套管損壞的幾率增加。因此在今后的頁(yè)巖氣壓裂改造過程中,有必要采用分步有限元模型,綜合考慮這些影響因素,合理優(yōu)化相關(guān)的壓裂作業(yè)參數(shù),從而確保后續(xù)壓裂完井作業(yè)的正常進(jìn)行。
[Abstract]:At present, most of shale gas development in Sichuan area in China adopts fracturing technology with large displacement, and some shale gas wells appear casing deformation in the process of construction, which leads to the failure of subsequent reconstruction. Therefore, it is very important to understand the variation of casing stress in fracturing process. Different from the traditional model, drilling and completion are considered based on step finite element method. In the whole process of fracturing, the finite element analysis model of casing cement ring-formation combination under shale anisotropy is established. The variation characteristics of stress and temperature field with time in multistage fracturing are simulated. The changes of injection temperature, casing pressure, in-situ stress and pore pressure are analyzed. The influence of elastic modulus of cement sheath and formation elastic modulus on casing stress state. The results show that the traditional model can underestimate the increase of casing stress in the process of fracturing. 2) in the process of large displacement fracturing, the casing stress is obviously increased due to the temperature fluctuation in the wellbore and the temperature drop of the injection fluid; (3) the uniformity of in-situ stress and the increase of pore pressure will lead to the increase of casing stress. (4) the anisotropy of shale has little effect on casing stress, and the decrease of formation property will increase the probability of casing damage. It is necessary to adopt the stepwise finite element model, consider these influencing factors synthetically, and optimize the relevant fracturing operation parameters reasonably, so as to ensure the normal operation of the subsequent fracturing and completion operations.
【作者單位】： 中國(guó)石油大學(xué)(北京)石油與天然氣工程學(xué)院;北京工業(yè)大學(xué);
【基金】：中國(guó)石油西南油氣田公司頁(yè)巖氣開發(fā)事業(yè)部科研項(xiàng)目(XNS21JS2014-04) 國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目(51334003) 中國(guó)石油科技創(chuàng)新基金研究項(xiàng)目(2012D-5006-0303)資助
【分類號(hào)】：TE377
【正文快照】： 科研項(xiàng)目(XNS21JS2014-04)、國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目(51334003)、中國(guó)石油科技創(chuàng)新基金研究項(xiàng)目(2012D-5006-0303)資助引用格式:范明濤,李軍,柳貢慧.基于分步有限元法的多級(jí)壓裂過程中套管應(yīng)力敏感性分析[J].科學(xué)技術(shù)與工程,2017,17(16):50—55Fan Mingtao,Li Jun,Liu Gongh

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