本文選題：碳酸鹽巖 + 液固兩相�。� 參考：《西南石油大學》2016年碩士論文

【摘要】：近年來在新探明的復雜裂縫性油氣儲層在總的油氣資源探明儲量的比例不斷增加,但由于裂縫性儲層普遍埋藏深,鉆井過程中安全密度窗口窄、井筒壓力波動大,經(jīng)常面臨溢漏同存、井控風險大等問題。本文基于裂縫特征參數(shù),測量與數(shù)字重構(gòu)裂縫三維空間,并開展裂縫動態(tài)變形規(guī)律研究是前述問題和進一步開展相關(guān)工程技術(shù)研究的基礎(chǔ)。本次論文綜合利用精細面形測量、三維空間重構(gòu)、多物理場有限元與離散元并行耦合模擬與理論方法,對單裂縫空間精細測量、建模并數(shù)學重構(gòu),開展裂縫動態(tài)閉合仿真模擬,研究取得了如下認識：(1)利用Shining 3D非接觸式高精度測量系統(tǒng),研究了天然裂縫表面的三維面形特征、裂縫的主要面形參數(shù),重構(gòu)裂縫表面及空間三維模型；(2)開展有限元模擬接觸變形的塑性流動區(qū)域和應(yīng)力分布規(guī)律；通過逆向工程建模及仿真模擬相結(jié)合的方法研究裂縫動態(tài)閉合過程中應(yīng)力應(yīng)變規(guī)律,研究驗證了裂縫閉合三個階段的應(yīng)力分布、速度場、壓力場的變化規(guī)律；(3)基于真實裂縫空間滲流的影響因素,仿真模擬真實裂縫粗糙度和裂縫寬度對滲流的影響,得出真實裂縫內(nèi)流場分布。(4)采用離散元與有限元軟件并行耦合運算方法,研究了裂縫空間在波動壓力條件下,裂縫內(nèi)固相顆粒運移沉降的一般規(guī)律,為揭示實際鉆井工況壓力動態(tài)變化下的裂縫空間動態(tài)變形時液-固耦合特征、隨鉆儲層分析、儲層保護及隨鉆堵漏等多個領(lǐng)域的深入研究提供理論依據(jù)。
[Abstract]:In recent years, the proportion of proven reserves in the total oil and gas resources of the newly proved complex fractured oil and gas reservoirs has been increasing, but due to the deep burial of the fractured reservoirs and the narrow safe density window during drilling, the wellbore pressure fluctuates greatly. Often faced with leakage co-storage, well control risk and other problems. In this paper, based on the characteristic parameters of fractures, the measurement and digital reconstruction of the three-dimensional space of fractures and the study of the dynamic deformation law of fractures are the basis of the above-mentioned problems and the further research of related engineering techniques. This paper synthetically uses fine plane shape measurement, three-dimensional space reconstruction, multi-physical field finite element and discrete element parallel coupling simulation and theory method, fine measurement of single crack space, modeling and mathematical reconstruction, and carries out simulation of crack dynamic closure. Using Shining 3D non-contact high precision measurement system, the 3D surface shape characteristics of natural cracks and the main surface parameters of cracks are studied. The plastic flow region and stress distribution of contact deformation are simulated by finite element method, and the stress-strain law in the process of crack dynamic closure is studied by the method of reverse engineering modeling and simulation. The study verifies the stress distribution, velocity field and variation rule of pressure field in the three stages of fracture closure. Based on the influencing factors of seepage flow in real fracture space, the influence of true crack roughness and crack width on seepage flow is simulated. It is obtained that the distribution of flow field in real fractures is a parallel coupling method of discrete element and finite element software, and the general law of solid particle migration and settlement in crack space under fluctuating pressure is studied. In order to reveal the liquid-solid coupling characteristics of fracture spatial dynamic deformation under actual drilling conditions, the theoretical basis is provided for the further study of reservoir analysis while drilling, reservoir protection and leakage plugging while drilling and so on.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TE21

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