本文選題：致密油藏 + 體積壓裂��； 參考：《東北石油大學》2015年碩士論文

【摘要】：隨著石油勘探開發(fā)工作的不斷深入,人們不斷向更低滲透致密儲層實際開發(fā)邁進。目前特低孔滲的頁巖氣、頁巖油和致密油逐漸成為人們關(guān)注的熱點,美國的致密油氣革命使美國油氣實現(xiàn)自給自足,總產(chǎn)量幾乎超越沙特阿拉伯。在全球低滲透致密油氣藏儲量巨大,其合理有效開發(fā)具有重大意義。但是致密儲層巖性致密,孔滲條件極差,通常發(fā)育微裂縫,微觀結(jié)構(gòu)極其復雜。油氣在其中的滲流已不再符合達西線性定律,而且還具有較強的應(yīng)力敏感性。致密油氣開采通常需要采用水平井壓裂技術(shù),采用一般的多級分段壓裂已經(jīng)不能滿足有效開發(fā)需求,通常還需要進行體積壓裂。體積壓裂通過整體改造提高儲層滲透率,通過在主裂縫延伸出多條分枝裂縫,或連通分散分布的天然微裂縫,最后形成貫通壓裂區(qū)的復雜裂縫網(wǎng)絡(luò)。但是這又在致密儲層的產(chǎn)能評價上增加了困難,對體積壓裂復雜裂縫網(wǎng)絡(luò)的正確描述和建模成為產(chǎn)能預(yù)測的難點,同時壓裂水平井整體產(chǎn)能評估也是水平井壓裂開發(fā)技術(shù)的一個難點。因而考慮致密儲層特性和體積壓裂復雜裂縫網(wǎng)絡(luò)特征對體積壓裂水平井的產(chǎn)能預(yù)測具有重要研究意義。本文對Q油田某區(qū)塊致密砂巖油藏體積壓裂水平井產(chǎn)能預(yù)測方法進行了研究。通過對Q油田致密區(qū)塊天然巖心進行流動實驗和壓力敏感性實驗,擬合出了該區(qū)塊致密儲層啟動壓力梯度和應(yīng)力敏感性經(jīng)驗公式,采用雙重孔隙介質(zhì)模型建立了體積壓裂復雜裂縫網(wǎng)絡(luò)的裂縫模型,對體積壓裂水平井整體產(chǎn)能模型進行了研究,利用數(shù)值模擬方法,開發(fā)出了一套致密儲層水平井體積壓裂產(chǎn)能預(yù)測程序。利用該程序研究了多個不同地質(zhì)因素對壓裂水平井產(chǎn)能的影響規(guī)律。通過對Q油田致密區(qū)塊數(shù)口體積壓裂水平井產(chǎn)能預(yù)測的具體使用,與實際開發(fā)結(jié)果比對效果令人滿意。
[Abstract]:With the development of petroleum exploration and development, people are moving towards the actual development of lower permeability and denser reservoirs. At present, the extremely low porosity and permeability of shale gas, shale oil and dense oil have gradually become the focus of attention. The American tight oil and gas revolution has made the United States self-sufficient in oil and gas, and its total output is almost higher than that of Saudi Arabia. In the world, the reserves of low permeability tight reservoirs are huge, and its rational and effective development is of great significance. But the lithology of tight reservoir is very tight, the condition of porosity and permeability is extremely poor, the microfracture is usually developed, and the microstructure is extremely complex. The percolation of oil and gas no longer obeys Darcy's linear law and has strong stress sensitivity. In dense oil and gas production, horizontal well fracturing technology is usually used, and general multistage fracturing can not meet the demand of effective development, and volume fracturing is usually needed. Volume fracturing improves reservoir permeability by integral transformation, and forms a complex fracture network through extending multiple branched fractures in main fractures or connecting and distributing natural micro-fractures. However, it is difficult to evaluate the productivity of dense reservoir, and the correct description and modeling of complex fracture network of volume fracturing become the difficulty of productivity prediction. At the same time, the whole productivity evaluation of fractured horizontal well is also a difficulty in fracturing development technology of horizontal well. Therefore, considering the characteristics of tight reservoir and complex fracture network of volume fracturing, it is important to study productivity prediction of horizontal wells with volume fracturing. In this paper, the productivity prediction method of volume fracturing horizontal wells in a compact sandstone reservoir in Q oilfield is studied. Through the flow test and pressure sensitivity experiment of natural core in dense block of Q oilfield, the empirical formulas of starting pressure gradient and stress sensitivity of tight reservoir in this block are fitted. The fracture model of complex fracture network for volume fracturing is established by using dual pore medium model. The whole productivity model of horizontal well with volume fracturing is studied, and the numerical simulation method is used. A set of prediction program for volume fracturing productivity of horizontal wells in dense reservoirs has been developed. The effects of different geological factors on the productivity of fractured horizontal wells are studied by using this program. Through the application of productivity prediction of several volume fracturing horizontal wells in compact blocks of Q oilfield, the comparison with actual development results is satisfactory.
【學位授予單位】：東北石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE328

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相關(guān)期刊論文 前1條

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本文編號：2035176