本文選題：稠油油藏　切入點：多元熱流體　出處：《中國地質(zhì)大學(xué)(北京)》2015年博士論文　論文類型：學(xué)位論文

【摘要】：多元熱流體吞吐是指同時注入蒸汽(熱水)、CO2、N2的多種高溫流體,燜井放噴后轉(zhuǎn)正常生產(chǎn),近年方興未艾。多元熱流體試井是目前為數(shù)不多的熱采動態(tài)監(jiān)測技術(shù),是及時掌握吞吐過程中地下參數(shù)變化,設(shè)計調(diào)控措施的直接依據(jù)。目前國內(nèi)外尚未有適用于直井、水平井多元熱流體吞吐過程解釋的理論和方法。多元熱流體試井同時監(jiān)測溫度和壓力,目前部分測試參數(shù)理論響應(yīng)規(guī)律不清,參考稠油油藏?zé)岵稍?構(gòu)建了稠油油藏多元熱流體吞吐直井、水平井試井解釋流程,推導(dǎo)并完善了溫度、多相控制下的理論壓力響應(yīng)模型,歸納了燜井和高溫生產(chǎn)期間壓力響應(yīng)規(guī)律,編寫了相應(yīng)軟件,提出了配套的解釋方法。主要創(chuàng)新性和重點研究工作包括四點:(1)針對多元熱流體燜井和高溫生產(chǎn)過程中地下流場存在多相,溫度、相態(tài)變化大且粘度等關(guān)鍵參數(shù)對溫度敏感的特征,確定了擬壓力函數(shù)形式。基于燜井和高溫生產(chǎn)測試過程中壓力與時間的單調(diào)變化關(guān)系,提出了擬壓力函數(shù)時態(tài)轉(zhuǎn)化概念和方法,實現(xiàn)了燜井和高溫生產(chǎn)過程中理論壓力的求解。(2)針對目前直井熱采試井模型以考慮粘度分區(qū)復(fù)合特征為主,不能描述溫度,密度、粘度、相態(tài)連續(xù)變化的不足,采用擬壓力函數(shù)考慮直井燜井和高溫生產(chǎn)過程中氣體飽和度、溫度連續(xù)變化對壓力的影響,建立了以擬壓力函數(shù)為變量的直井熱采試井?dāng)?shù)學(xué)模型。在常規(guī)Laplace變換、Sthfest數(shù)值反演求解流程中引入擬壓力函數(shù)時態(tài)轉(zhuǎn)化方法,實現(xiàn)了直井燜井和高溫生產(chǎn)過程中理論壓力的求解。(3)針對目前缺少水平井熱采試井模型,常規(guī)水平井冷采試井模型不能考慮熱區(qū)和冷區(qū)形狀的問題,將水平井熱區(qū)假設(shè)為以水平段為軸的圓柱體,建立了對應(yīng)的數(shù)學(xué)模型。利用擬壓力函數(shù)時態(tài)轉(zhuǎn)化方法,建立了反映波及半徑的線源函數(shù)。結(jié)合厚度為水平段長度的板源函數(shù),應(yīng)用Newman乘積方法構(gòu)建了點源函數(shù)。采用Duhamel原理、Laplace變換和Stehfest數(shù)值反演方法,實現(xiàn)了水平井燜井和高溫生產(chǎn)過程中理論壓力的求解。(4)歸納、明確了多元熱流體吞吐過程燜井和高溫生產(chǎn)期間壓力響應(yīng)規(guī)律。篩選了燜井過程壓力響應(yīng)敏感參數(shù):內(nèi)外區(qū)滲透率、加熱半徑、蒸汽干度、注入溫度、吸氣段長度;高溫生產(chǎn)過程壓力響應(yīng)敏感參數(shù):內(nèi)外區(qū)滲透率、加熱半徑、出液段長度。尤其是明晰了蒸汽干度、水加熱半徑影響壓力和壓力導(dǎo)數(shù)曲線位置、凹形大小和標(biāo)準(zhǔn)化壓力曲線第一個峰,水平井吸氣(出液)段長度影響壓力和壓力導(dǎo)數(shù)曲線第一個峰。在理論研究的基礎(chǔ)上,編制了多元熱流體試井解釋軟件,完成了正確性驗證。結(jié)合多元熱流體吞吐過程燜井和高溫生產(chǎn)期間壓力響應(yīng)規(guī)律,提出了直井、水平井多元熱流體試井燜井和高溫生產(chǎn)測試過程的配套解釋流程,并完成了解釋應(yīng)用。
[Abstract]:Multicomponent thermal fluid huff and puff refers to a variety of high temperature fluids that simultaneously inject steam (hot water and CO _ 2N _ 2), and turn to normal production after release of braised well. In recent years, multi-element thermal fluid well testing is one of the few current monitoring techniques for thermal recovery performance. It is the direct basis for mastering the change of underground parameters and designing the control measures in time. At present, there is no suitable for vertical wells at home and abroad. The theory and method of interpretation of multicomponent thermal fluid huff and puff process in horizontal well. The temperature and pressure are monitored simultaneously by multicomponent thermal fluid well test. At present, the theoretical response law of some test parameters is unclear, referring to the thermal recovery principle of heavy oil reservoir, In this paper, the well test interpretation flow of multicomponent heat fluid huff and puff vertical well and horizontal well in heavy oil reservoir is constructed, the theoretical pressure response model under temperature and multiphase control is deduced and perfected, and the pressure response law during braised well and high temperature production is summarized. The corresponding software is compiled, and the corresponding interpretation method is put forward. The main innovation and key research work include four points: 1) aiming at the existence of multi-phase and temperature in the underground flow field in the process of multi-element hot fluid braising and high temperature production, The key parameters such as phase state change and viscosity are sensitive to temperature, and the pseudo pressure function form is determined. Based on the monotonic variation of pressure and time in braised well and high temperature production test, The concept and method of temporal transformation of pseudo pressure function are put forward. The solution of theoretical pressure in braised well and high temperature production is realized. Because of the shortage of continuous change of viscosity and phase state, the effect of continuous variation of temperature on pressure is considered by using pseudo pressure function to consider the saturation of gas in the process of direct well braising and high temperature production. A mathematical model of thermal recovery testing for vertical wells with pseudo pressure function as variable is established. The temporal transformation method of quasi pressure function is introduced in the conventional Laplace transform and Sthfest numerical inversion process. In view of the lack of horizontal well thermal recovery well test model at present, the conventional horizontal well cold production well test model can not consider the problem of hot zone and cold zone shape. The thermal region of horizontal well is assumed to be a cylinder with horizontal section as the axis, and the corresponding mathematical model is established. By using the method of temporal transformation of pseudo pressure function, a linear source function reflecting the sweep radius is established, and the plate source function with thickness as the length of horizontal section is established. The point source function is constructed by using the Newman product method, the Duhamel principle and the Stehfest numerical inversion method are used to realize the theoretical pressure solution in the process of horizontal well braising and high temperature production. The rules of pressure response during multicomponent hot fluid soaking and high temperature production were determined. The sensitive parameters of pressure response in braised well were selected: permeability inside and outside, heating radius, steam dryness, injection temperature, length of inspiratory section; The sensitive parameters of pressure response during high temperature production are: permeability, heating radius, length of the outlet, especially the steam dryness, the water heating radius affects the position of pressure and pressure derivative curve. The first peak of concave size and standardized pressure curve, and the first peak of horizontal well suction section length affecting pressure and pressure derivative curve. On the basis of theoretical research, a multivariate thermal fluid well test interpretation software is developed. The correctness verification has been completed. Combined with the pressure response law of braised well and high temperature production during multicomponent hot fluid huff and puff process, a complete set of interpretation flow is put forward for straight well, horizontal well multivariate hot fluid well test and high temperature production test process. And completed the application of interpretation.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TE353

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