Oil Recovery Process with Composition-Adjustable Multi-Component Thermal Fluid (MCTF)

Abstract

The present invention relates to an oil recovery process with composition-adjustable multi-component thermal fluid, the process comprises: adding oxygen produced by air together with fuel and water into a reactor, in which the oxygen and the fuel combust to produce flue gas and heat, the heat heats water to generate hot water/steam, and then the flue gas and the hot water/steam are mixed to form multi-component thermal fluid, wherein the purity of oxygen added into the reactor is controlled so as to produce the multi-component thermal fluid with various mass ratios of flue gas to hot water/steam; then the obtained multi-component thermal fluid with various mass ratios of flue gas to hot water/steam are injected into various types of oil reservoirs for oil recovery. The oil recovery process of the present invention is applicable for various types of crude oil reservoirs.

What is claimed is: 
     
         1 . An oil recovery process with composition-adjustable multi-component thermal fluid, comprising:
 adding oxygen produced by air together with fuel and water into a reactor, in which the oxygen and the fuel combusting to produce flue gas and heat, the heat heating water to generate hot water/steam, and then the flue gas and the hot water/steam being mixed to form multi-component thermal fluid,   wherein the purity of oxygen added into the reactor is controlled so as to produce the multi-component thermal fluid with various mass ratios of flue gas to hot water/steam; then the obtained multi-component thermal fluid with various mass ratios of flue gas to hot water/steam are injected into various types of oil reservoirs for oil recovery.   
     
     
         2 . The oil recovery process with composition-adjustable multi-component thermal fluid of  claim 1 , wherein the purity of oxygen added into the reactor is controlled according to the viscosity of the various types of oil reservoirs, the higher the viscosity of the oil reservoirs, the relatively higher the purity of oxygen added into the reactor, and the lower the viscosity of the oil reservoirs, the relatively lower the purity of oxygen added into the reactor. 
     
     
         3 . The oil recovery process with composition-adjustable multi-component thermal fluid of  claim 2 , as for the oil reservoirs with a viscosity of greater than 10,000 mP·s, the purity of oxygen added into the reactor is controlled to be 50%-90%; as for the oil reservoirs with a viscosity of 150-10,000 mPa·s, the purity of oxygen added into the reactor is controlled to be 30%-50%; as for the oil reservoirs with a viscosity of 50-150 mPa·s, the purity of oxygen added into the reactor is controlled to be 21%-30%. 
     
     
         4 . The oil recovery process with composition-adjustable multi-component thermal fluid of  claim 3 , wherein, when the purity of oxygen added into the reactor is 50%˜90%, multi-component thermal fluid where the mass ratio of flue gas to hot water/steam is 0.20-0.37 is obtained; when the purity of oxygen added into the reactor is 30%-50%, multi-component thermal fluid where the mass ratio of flue gas to hot water/steam is 0.36-0.61 is obtained; and when the purity of oxygen added into the reactor is 21%-30%, multi-component thermal fluid where the mass ratio of flue gas to hot water/steam is 0.31-0.62 is obtained. 
     
     
         5 . The oil recovery process with composition-adjustable multi-component thermal fluid of  claim 1 , wherein the purity of oxygen added into the reactor is controlled to be 50%-90% so as to obtain multi-component thermal fluid where the mass ratio of flue gas to hot water/steam is 0.20-0.37, the multi-component thermal fluid at a temperature of 250° C.-350° C. is injected into an oil reservoir with a viscosity of greater than 10,000 mP·s to carry out oil recovery in a manner of multi-component thermal fluid assisted gravity drainage thermal recovery. 
     
     
         6 . The oil recovery process with composition-adjustable multi-component thermal fluid of  claim 1 , wherein the purity of oxygen added into the reactor is controlled to be 30%-50% so as to obtain multi-component thermal fluid where the mass ratio of flue gas to hot water/steam is 0.36-0.61, the multi-component thermal fluid at a temperature of 250° C.-350° C. is injected into an oil reservoir with a viscosity of 150-10,000 mPa·s to carry out oil recovery in a manner of cyclic multi-component thermal fluid stimulation thermal recovery. 
     
     
         7 . The oil recovery process with composition-adjustable multi-component thermal fluid of  claim 1 , wherein the purity of oxygen added into the reactor is controlled to be 21%-30% so as to obtain multi-component thermal fluid where the mass ratio of flue gas to hot water/steam is 0.31-0.62, the multi-component thermal fluid at a temperature of 150° C.-250° C. is injected into an oil reservoir with a viscosity of 50-150 mPa·s to carry out oil recovery in a manner of multi-component thermal fluid flooding thermal recovery. 
     
     
         8 . The oil recovery process with composition-adjustable multi-component thermal fluid of  claim 1 , wherein the injecting temperature of the multi-component thermal fluid is 120° C.-350° C. 
     
     
         9 . The oil recovery process with composition-adjustable multi-component thermal fluid of  claim 1 , wherein the injecting rate of the multi-component thermal fluid is 150 m 3 /d-350 m 3 /d.