【摘要】：稠油開采技術(shù)中最典型的方法是注蒸汽熱采,傳統(tǒng)地面注蒸汽式稠油開采技術(shù)熱損大、能效低、占地廣導致稠油開采綜合經(jīng)濟效益低。電磁感應加熱技術(shù)的諸多優(yōu)點為利用井下加熱器開采稠油提供潛在性。因此,本文對井下電磁感應加熱器進行理論分析及實驗研究,探索利用井下加熱器提升稠油開采技術(shù)的可行性。本文針對稠油加熱降粘技術(shù)需求闡述井下電磁感應加熱原理,分析加熱磁場分布、勵磁線圈和發(fā)熱元件等因素對井下加熱器加熱效果的影響,完成井下加熱器功率計算推導。結(jié)合井下環(huán)境,設(shè)計長1000mm,直徑70mm,流道直徑34mm的井下加熱器。完成加熱器感應線圈材質(zhì)、螺距、壁厚、繞制半徑和高度,發(fā)熱元件材質(zhì)、壁厚、半徑和長度,隔層材質(zhì)等內(nèi)部參數(shù)確定。勵磁頻率為10 kHz時,該加熱器理論發(fā)熱功率為23.04kW。從發(fā)熱元件和熱交換接觸面的角度提出加熱器功率擴容增效方案。利用多物理場仿真軟件COMSOL Multiphysics對加熱器進行建模仿真,分析勵磁電流、勵磁頻率對加熱磁場、溫度場和渦流場分布的影響。仿真結(jié)果表明勵磁頻率為10 kHz時,加熱器發(fā)熱元件內(nèi)壁溫度可達220℃;增加加熱器長度可以顯著提高加熱效果。搭建實驗平臺對理論計算及加熱器結(jié)構(gòu)設(shè)計合理性進行驗證,實驗結(jié)果表明所設(shè)計的井下電磁感應加熱器的實測發(fā)熱功率可達到20 kW,其電效率在90%左右;加熱器105℃的蒸汽產(chǎn)量為163.43kg/h。本論文采用理論、仿真、實驗三者相結(jié)合的技術(shù)手段完成井下電磁感應加熱器基礎(chǔ)理論分析及實驗研究。論文所取得的成果對于井下電磁感應加熱器在稠油熱采中的工程化應用具有一定的理論支持和技術(shù)指導作用。
[Abstract]:The most typical method of heavy oil recovery technology is steam injection thermal recovery. The traditional surface steam injection heavy oil recovery technology has large heat loss and low energy efficiency, which leads to the low comprehensive economic benefit of heavy oil recovery. Many advantages of electromagnetic induction heating technology provide potential for heavy oil recovery with downhole heaters. Therefore, this paper makes theoretical analysis and experimental research on downhole electromagnetic induction heater, and explores the feasibility of using downhole heater to promote heavy oil production technology. According to the technical requirements of heavy oil heating and viscosity reduction, this paper expounds the principle of downhole electromagnetic induction heating, analyzes the influence of heating magnetic field distribution, excitation coil and heating elements on the heating effect of downhole heater, and completes the calculation and derivation of downhole heater power. Combined with the underground environment, a downhole heater with a length of 1000mm, a diameter of 70mm and a diameter of 34mm is designed. Complete heater induction coil material, pitch, wall thickness, winding radius and height, heating element material, wall thickness, radius and length, interlayer material and other internal parameters. When the excitation frequency is 10 kHz, the theoretical heating power of the heater is 23.04 kW. From the point of view of heating element and heat exchange interface, a scheme of capacity expansion and enhancement of heater power is put forward. The multi-physical field simulation software COMSOL Multiphysics is used to model and simulate the heater, and the effects of excitation current and excitation frequency on the distribution of heating magnetic field, temperature field and vortex field are analyzed. The simulation results show that the temperature of the inner wall of the heater heating element can reach 220 鈩，

本文編號：2474097