稠油熱采空心桿閉式熱載體循環加熱技術 Hollw Rod Closed Heat Carrier Circulating Heating Technology For Heavy Oil Therma

　　

　　加熱裝置→鋼扁絲軟管→空心桿四通→井下連續不銹鋼隔熱保溫管→緩沖罐→循環泵→加熱裝置

　　Heating device → Steel flat wire hose → Hollow rod four-way → Underground continuous stainless steel Insulated tubing → Buffer tank → Circulation pump → Heating device

　　

　　1、井下連續不銹鋼隔熱保溫管

　　本產品內外管采用316L不銹鋼材質，抗拉強度高拉力可達到9噸，可多次循環使用。

　　公稱直徑Ф25mm，外徑Ф25mm，通徑Ф18mm，適應空心抽油桿Ф42mm。

　　

　　具有以下優點：

　�。�1）耐溫等級高。它的耐溫等級能達到300℃以上，能較好地解決稠油，尤其是超稠油的井筒加熱問題。

　�。�2）導熱系數低，保溫性能好。內、外管之間絕熱層是由航空耐高溫絕熱材料充填并抽真空而成，在溫度400℃時，保溫管的導熱系數小于0.2w/m.k。

　�。�3）使用壽命長。隔熱管內、外層和兩端接頭都是不銹鋼材質，強度高，抗腐蝕。

　�。�4）重量輕。由于采用三層結構，且中間充填的耐高溫絕熱材料密度較低，因此保溫管的重量比同等厚度的不銹鋼管材要輕得多。

　�。�5）循環量高，加熱效果好。采用該保溫管后，空心抽油桿與保溫管之間的環空截面較大，因此循環量高，加熱效果好。

　�。�6）采用單根連接方式，起下施工方便。

　�。�7）能相對獨立工作。該保溫管獨立于空心抽油桿，使用過程中只承受自重，受力小，不受空心抽油桿伸縮應力的影響。連接處采用耐高溫密封圈密封，密封性能好。

 

　　1.Underground continuous stainless steel insulated tubing

　　The inner and outer tube adopts 316 L stainless steel. High tensile strength, tensile force of up to 9 tons, and multiple recycling. Nominal diameter 25mm, O.D 25mm, Diameter 18mm, Suitable for the diameter 42mm of hollow sucker rod. 

　　

　　Advantages

　　(1)High temperature tolerance grade. It can reach above 300 ℃ which can better solve the heating problem of heavy oil and super heavy oil wellbore. 

　　(2)Low thermal conductivity and good thermal insulation. The insulating layer between the inner and outer tube is made by filling and vacuuming the high temperature insulating material of aviation. The thermal conductivity of insulated tubing is less than 0.2w/m.k at 400 ℃.

　　(3)Long service life. The joints at both ends are made of stainless steel, high strength, corrosion resistance. 

　　(4)Light in weight. With a three-layer structure, the density of the high-temperature insulation material filled in the middle is low, so the weight of the insulated tubing is much lighter than that of the stainless steel tube with the same thickness.

　　(5)High circulation and good heating effect. The annular section between the hollow sucker rod and the heat insulated tubing is large, so the circulation amount is high. 

　　(6)The single connection method is adopted, which makes the hoisting construction easier. 

　　(7)Ability to work independently. The insulation tube is independent of the hollow sucker rod and only bears its own weight during use, the force is small and not affected by the expansion stress of the hollow sucker rod. The joint is sealed with a high-temperature seal ring. 

 

　　2、自控系統

　　含溫度計、壓力變送器、低水位檢測裝置、自控閥門等。自控系統對工作狀態進行控制，管理方便，滿足野外工作的需要。通過PLC對加熱裝置和循環泵的工作狀態進行控制：低水位自動報警，超高溫自動停爐，低水溫自動啟爐，可實現無人值守。

 

　　2.Automatic control system

　　It includes thermometer, pressure transmitter, low water level detection device, and self-control valve. The automatic control system controls the working state and is convenient to manage and meet the needs of field work. The working state of the heating device and the circulating pump is controlled by the PLC: automatic alarm when low water level occurs, automatic shutdown when ultra-high temperature occurs, automatic opening when low water temperature occurs, and unattended operation can be achieved.

 

　　3、鋼扁絲軟管

　　耐高溫高壓鋼扁絲軟管帶保溫功能，內徑Ф25mm,外徑Ф38.5mm,工作水壓≤21MPa，工作氣壓≤2MPa，工作溫度-20℃－180℃

 

　　3.Steel flat wire hose

　　With the function of heat insulation, I.D 25mm, O.D 38.5mm, hydrostatic pressure ≤ 21MPa, pneumatic pressure≤ 2MPa, temperature range: -20 ℃ to 180 ℃