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  本文關(guān)鍵詞：耦合鉆井液溫度特性的地熱井井筒溫度的數(shù)值模擬與分析　出處：《中國地質(zhì)大學(北京)》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 地熱井 井筒溫度 鉆井液溫度特性 數(shù)值模擬 敏感性分析

【摘要】：地熱能是一種綠色、高效、儲量巨大、可再生的新能源,具有廣闊的發(fā)展前景。地熱能的開發(fā)與利用離不開鉆井工作,地熱井的地層溫度高,影響了鉆井液的性能,而鉆井液的特性決定井筒溫度;另外,地熱井往往存在多個地溫梯度,本文耦合鉆井液溫度特性、計算時考慮了多個地溫梯度的影響模擬分析了地熱井井筒溫度,對準確計算井筒溫度具有重要意義。取得的成果如下:1.建立了鉆井液循環(huán)狀態(tài)下井筒傳熱模型。根據(jù)能量守恒定理和傳熱學基本原理并結(jié)合井筒內(nèi)的實際情況建立了鉆井液循環(huán)狀態(tài)下井筒穩(wěn)態(tài)傳熱模型和非穩(wěn)態(tài)傳熱模型并對模型進行求解。2.研究了鉆井液的溫度特性。研究了溫度對鉆井液密度、流速、比熱容、導(dǎo)熱系數(shù)和粘度的影響。3.評價了鉆井液循環(huán)狀態(tài)下井筒傳熱模型的準確性。評價了鉆井液循環(huán)狀態(tài)下穩(wěn)態(tài)傳熱模型、鉆井液性能恒定和耦合鉆井液溫度特性的非穩(wěn)態(tài)傳熱模型的準確性,得出對于所研究的井筒,穩(wěn)態(tài)傳熱模型、鉆井液性能恒定和耦合鉆井液溫度特性的非穩(wěn)態(tài)傳熱模型均具有良好的準確性,但耦合鉆井液溫度特性的非穩(wěn)態(tài)傳熱模型的精確度最高。4.應(yīng)用了耦合鉆井液溫度特性的非穩(wěn)態(tài)傳熱模型。將耦合鉆井液溫度特性的非穩(wěn)態(tài)傳熱模型應(yīng)用于羊易ZK212和青海貴德ZR1地熱井井筒溫度研究,計算時考慮了多個地溫梯度的影響,模型具有良好的適用性。5.分析了參數(shù)敏感性。分別改變地溫梯度、鉆井液體積流量、入口溫度、循環(huán)時間、環(huán)空間隙、鉆井液密度、鉆井液比熱容、鉆井液導(dǎo)熱系數(shù)和鉆井液粘度,重新計算羊易ZK212地熱井井筒溫度并將計算結(jié)果與改變前對比,分析了上述參數(shù)對羊易ZK212地熱井井筒溫度的影響,然后將本文參數(shù)敏感性分析所得結(jié)論與前人文章中結(jié)論進行對比分析。
[Abstract]:Geothermal energy is a green, efficient, huge reserves, renewable new energy, has a broad development prospects. The development and utilization of geothermal energy can not be separated from drilling work, the formation temperature of geothermal wells is high. The performance of drilling fluid is affected, and the wellbore temperature is determined by the characteristics of drilling fluid. In addition, there are many geothermal gradients in geothermal wells. In this paper, the temperature characteristics of drilling fluid are coupled and the influence of multiple geothermal gradients is taken into account in the calculation, and the wellbore temperature of geothermal wells is simulated and analyzed. It is of great significance for accurate calculation of wellbore temperature. The results obtained are as follows:. 1. The wellbore heat transfer model under the condition of drilling fluid circulation is established. According to the energy conservation theorem and the basic principles of heat transfer and the actual situation in the wellbore, the wellbore steady state heat transfer model and the unsteady state are established under the condition of drilling fluid circulation. The temperature characteristics of drilling fluid and the effect of temperature on the density of drilling fluid are studied. The influence of flow rate, specific heat capacity, heat conductivity and viscosity. 3. The accuracy of wellbore heat transfer model under drilling fluid circulation state and steady state heat transfer model under drilling fluid circulation state are evaluated. The accuracy of the unsteady heat transfer model with constant drilling fluid performance and coupled drilling fluid temperature characteristics, the steady-state heat transfer model is obtained for the wellbore studied. The unsteady heat transfer model with constant drilling fluid performance and coupled drilling fluid temperature characteristics has good accuracy. However, the unsteady heat transfer model of coupled drilling fluid temperature characteristics is the most accurate. 4. The unsteady heat transfer model of coupled drilling fluid temperature characteristic is applied to Yangyang heat transfer model. Study on wellbore temperature of geothermal wells in Yi ZK212 and ZR1, Guide, Qinghai Province. The model has good applicability. 5. Analysis of the sensitivity of parameters. Change the geothermal gradient, drilling fluid volume flow, inlet temperature, cycle time, annulus clearance. Drilling fluid density, specific heat capacity of drilling fluid, heat conductivity of drilling fluid and viscosity of drilling fluid are calculated again and the calculated results are compared with those before change. The influence of the above parameters on the wellbore temperature of Yangyi ZK212 geothermal well is analyzed.
【學位授予單位】：中國地質(zhì)大學(北京)
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P314

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