本文選題：生產(chǎn)動(dòng)態(tài)分析　切入點(diǎn)：井下節(jié)流　出處：《西南石油大學(xué)》2015年碩士論文

【摘要】：井下節(jié)流工藝能夠降壓安全生產(chǎn)和降低氣田開發(fā)成本,但是井下節(jié)流后井口油壓與井底流壓的自然聯(lián)系被阻斷,實(shí)測流壓又十分困難,在這種條件下如何利用井口資料進(jìn)行動(dòng)態(tài)分析十分必要。利用日常記錄的井口資料進(jìn)行分析,需要以單井開采系統(tǒng)為研究對象,根據(jù)天然氣在地層、井筒中的流動(dòng)特性,根據(jù)流量、壓力的變化,分析生產(chǎn)系統(tǒng)在不同時(shí)期、不同條件下的協(xié)調(diào)工作狀態(tài),評價(jià)氣井的控制儲量、合理產(chǎn)能,同時(shí)分析井下節(jié)流工具在下深處的工作狀態(tài),是否滿足最佳工藝要求。 本文針對井下節(jié)流采氣工藝的高壓氣井,采用井筒-氣藏流動(dòng)耦合方式進(jìn)行生產(chǎn)動(dòng)態(tài)分析。為此,本文完成的主要工作如下： 1、考慮節(jié)流溫降效應(yīng),建立了井筒溫度場模型,預(yù)測井筒非線性溫度場及相關(guān)熱力學(xué)參數(shù)；綜合井下節(jié)流、地層傳熱效應(yīng),建立了井筒流動(dòng)模型。 2、針對壓裂井、水平井建立了滲流數(shù)學(xué)模型,作為氣井流入動(dòng)態(tài)預(yù)測。 3、通過氣藏單井?dāng)?shù)值模擬對比,分析傳統(tǒng)擬壓力法的適用條件,提出了基于物質(zhì)平衡約束,考慮地層壓力下降的流體性影響及非線性滲流近似計(jì)算方法,改進(jìn)了氣藏動(dòng)態(tài)分析的理論模型,提高了井底壓和平均地層壓力的預(yù)測精度。 4、將井筒流動(dòng)與氣層滲流作為一個(gè)整體,考慮節(jié)流條件下井筒流動(dòng)的壓力間斷、溫度突變的特殊性,建立氣井動(dòng)態(tài)分析模型。 基于以上的研究成果,本文最后對X氣藏的井下節(jié)流氣井,進(jìn)行了生產(chǎn)動(dòng)態(tài)分析,形成生產(chǎn)指數(shù)診斷曲線,通過套壓與理論曲線的擬合,解釋地層參數(shù),獲得壓力剖面、溫度剖面、速度剖面。
[Abstract]:The downhole throttling process can reduce the production pressure and the development cost of the gas field, but the natural connection between the wellhead oil pressure and the bottom hole flow pressure is blocked after downhole throttling, and the measured flow pressure is very difficult.Under this condition, it is necessary to make use of wellhead data for dynamic analysis.Using the daily recorded wellhead data for analysis, it is necessary to analyze the production system in different periods according to the flow characteristics of natural gas in formation and wellbore, according to the change of flow rate and pressure, taking the single well production system as the research object.At the same time, the working condition of the downhole throttling tool in the bottom of the well is analyzed, and whether it meets the best technological requirements is also analyzed in this paper, including the coordinated working state under different conditions, the evaluation of the controlled reserves of the gas well, and the reasonable productivity.In this paper, the production performance of high pressure gas wells with downhole throttling gas recovery technology is analyzed by wellbore gas reservoir flow coupling method.Therefore, the main work accomplished in this paper is as follows:1. Considering the effect of throttling temperature drop, the model of wellbore temperature field is established to predict the nonlinear temperature field of wellbore and related thermodynamic parameters, and the wellbore flow model is established by synthesizing downhole throttling and formation heat transfer effect.2. For fracturing wells and horizontal wells, a mathematical model of percolation is established to predict the inflow performance of gas wells.3. Through numerical simulation and comparison of single well in gas reservoir, the suitable conditions of traditional pseudo pressure method are analyzed. Based on the material balance constraint, the fluid effect of formation pressure drop and the approximate calculation method of nonlinear percolation are put forward.The theoretical model of gas reservoir performance analysis is improved and the prediction accuracy of bottom hole pressure and average formation pressure is improved.4. Taking wellbore flow and gas reservoir seepage as a whole, considering the pressure discontinuity of wellbore flow under throttling condition and the particularity of temperature abrupt change, the dynamic analysis model of gas well is established.Based on the above research results, in the end of this paper, the production performance analysis is carried out for the downhole throttling gas wells in X gas reservoir, and the production index diagnosis curve is formed. The formation parameters are explained by fitting the casing pressure with the theoretical curve, and the pressure profile is obtained.Temperature profile, velocity profile.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE37

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本文編號：1703652