【摘要】：受頁巖儲(chǔ)層低滲透物性的影響,頁巖氣(油)藏需要經(jīng)過水力壓裂改造后才能開采。由于水平井在增加與儲(chǔ)層接觸面積、降低費(fèi)用、擁有長期的穩(wěn)產(chǎn)能力等方面具有明顯的優(yōu)勢,它在頁巖氣開發(fā)中得到了廣泛的應(yīng)用,尤其是與滑溜水多級(jí)壓裂相配合時(shí),增產(chǎn)效果更為顯著。絕大多數(shù)壓裂作業(yè)是在套管射孔完井之后進(jìn)行的,而水力裂縫的起裂與頁巖巖石力學(xué)特性和頁巖儲(chǔ)層力學(xué)性質(zhì)的非均勻性息息相關(guān),因而射孔完井后實(shí)際的裂縫起裂和延伸是復(fù)雜多樣的。此外,頁巖儲(chǔ)層常發(fā)育有大量天然裂縫和層理,對(duì)頁巖儲(chǔ)層的水力壓裂可形成大規(guī)模網(wǎng)狀裂縫,這就是通常的體積壓裂的效果。本文在中國石油科技創(chuàng)新基金資助項(xiàng)目(2013D-5006-0211)、國家自然科學(xué)基金資助項(xiàng)目(51479024)、國家重點(diǎn)基礎(chǔ)研究計(jì)劃973項(xiàng)目(2014CB047103)的資助下,基于對(duì)前人闡述的巖體水力壓裂機(jī)理的認(rèn)識(shí),從壓裂過程中水力耦合作用的滲流-應(yīng)力-損傷模型出發(fā),并使其在有限元軟件RFPA滲流版中實(shí)現(xiàn),對(duì)有限的巖心物理實(shí)驗(yàn)結(jié)果進(jìn)行了模擬和分析評(píng)價(jià),得到后續(xù)有關(guān)章節(jié)相關(guān)的實(shí)驗(yàn)參數(shù),進(jìn)而開展對(duì)頁巖儲(chǔ)層水平井水力裂縫的起裂和擴(kuò)展特征的數(shù)值模擬研究。首先,對(duì)水平井定向射孔水力裂縫的起裂特征進(jìn)行了數(shù)值模擬研究,并就地應(yīng)力差和射孔方位角兩因素對(duì)其影響建立數(shù)值模型展開了詳細(xì)分析,得到的結(jié)果顯示有水力裂縫可能不在射孔端起裂的情況,在此基礎(chǔ)上,進(jìn)一步探討了壓裂雙裂縫形成的可能性和條件。此外,模擬了裂縫延伸至產(chǎn)層與隔層界面處的穿層現(xiàn)象。數(shù)值分析結(jié)果進(jìn)一步豐富對(duì)水平井射孔參數(shù)優(yōu)化及水力壓裂施工的研究。其次,鑒于頁巖儲(chǔ)層通常發(fā)育有大量的天然裂縫,對(duì)層狀頁巖儲(chǔ)層中水力裂縫與天然層理的相互作用以及縫網(wǎng)的形成規(guī)律進(jìn)行了數(shù)值模擬,借鑒水平應(yīng)力差異系數(shù)初步分析體積壓裂技術(shù)的效果,同時(shí)建立數(shù)值模型分析了地應(yīng)力差、脆性指數(shù)、層理特征等因素對(duì)形成的壓裂縫網(wǎng)復(fù)雜程度的影響,希望能對(duì)頁巖儲(chǔ)層壓裂縫網(wǎng)形成的研究和設(shè)計(jì)提供些許參考。最后,依據(jù)目標(biāo)儲(chǔ)層實(shí)際情況對(duì)單井不同間距裂縫周圍的應(yīng)力分布及相互干擾現(xiàn)象進(jìn)行了數(shù)值分析,對(duì)壓裂裂縫間距進(jìn)行優(yōu)化選擇,并進(jìn)一步分析了兩井同步壓裂時(shí)壓裂段裂縫的合理間距,在此基礎(chǔ)上,綜合評(píng)價(jià)了兩種壓裂方案。
[Abstract]:Affected by the low permeability of shale reservoir, shale gas (oil) reservoir needs hydraulic fracturing before it can be exploited. Because horizontal well has obvious advantages in increasing contact area with reservoir, reducing cost and having long-term stable production ability, it has been widely used in shale gas development, especially when cooperating with slippery water multistage fracturing. The effect of increasing production is more remarkable. Most fracturing operations take place after casing perforation, and the initiation of hydraulic fractures is closely related to the mechanical properties of shale rocks and the nonuniformity of shale reservoir mechanical properties. Therefore, the actual fracture initiation and extension after perforation completion is complex and diverse. In addition, a large number of natural fractures and bedding are often developed in shale reservoirs. Hydraulic fracturing of shale reservoirs can form large scale network fractures, which is the effect of normal volume fracturing. This paper is supported by the China Petroleum Science and Technology Innovation Fund (2013D-5006-0211), the National Natural Science Foundation of China (51479024) and the State key basic Research Program 973 (2014CB047103). Based on the understanding of hydraulic fracturing mechanism of rock mass described by predecessors, the seepage stress-damage model of hydraulic coupling action in fracturing process is set out, and it is realized in the finite element software RFPA percolation plate. The finite core physical experimental results are simulated and evaluated, and the experimental parameters related to the subsequent chapters are obtained, and the numerical simulation of the fracture initiation and propagation characteristics of horizontal well in shale reservoir is carried out. Firstly, numerical simulation of the initiation characteristics of directional perforating hydraulic fractures in horizontal wells is carried out, and a numerical model is established to analyze the effects of two factors: ground stress difference and perforation azimuth. The results show that hydraulic fractures may not occur at the perforation end. On this basis, the possibility and conditions of the formation of fracturing double fractures are further discussed. In addition, the phenomenon of the fracture extending to the interface between the production layer and the interlayer is simulated. The numerical analysis results further enrich the research on the optimization of perforation parameters and hydraulic fracturing operation of horizontal wells. Secondly, in view of the large number of natural fractures in shale reservoirs, the interaction between hydraulic fractures and natural beddings in layered shale reservoirs and the formation of fracture networks are numerically simulated. Using horizontal stress difference coefficient for reference, the effect of volume fracturing technique is preliminarily analyzed. At the same time, a numerical model is established to analyze the influence of factors such as ground stress difference, brittleness index and bedding characteristics on the complex degree of fracture network formed. It is hoped that this paper can provide some references for the research and design of the formation of fracture network in shale reservoir. Finally, according to the actual situation of the target reservoir, the stress distribution and interferences around the fractures with different spacing in single well are analyzed numerically, and the fracture spacing is optimized. On the basis of the analysis of the reasonable fracture spacing between the two wells during synchronous fracturing, two fracturing schemes are comprehensively evaluated.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE357.1

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