Fire-drive oil-production ignition method for metamorphic rock burial hill high-cogulation oil pool

Abstract

Present invention relates to a metamorphic rock burial hill high pour-point oil reservoir fire flood ignition method. The difference of combustion of oil in-situ with other oil recovery method is utilizing high solidification points oil composition as fuel continuously generating, to drive in-place oil out of ground, current fire flood ignition method technology mainly used for symmetrical sand body and thin interbed, but it is difficult to be used for metamorphic rock burial hill high solidification points oil reservoir duo to low permeability of strata and porosity. Therefore said invention fills high-temperature air in well after to proceed manual pressing crack to ground, heating up high solidification points oil in rock pressure crack to above 400 degree centigrade, to make crude oil fluidal disposition, extracting crude oil from horizontal well, when oil layer burning, exhausting out burning layer air through gas recovery, to make whole oil layer being stable combustion state for raising recovery ratio. Said invention is simple and convenience for construction, can be widely used for metamorphic rock burial hill viscous crude, high solidification points oil exploitation.

Description

Technical field: [0001] The invention relates to an ignition method for fire flooding and oil recovery in a metamorphic buried hill high pour point oil reservoir, which belongs to the ignition technology for metamorphic buried hill oil wells. Background technique: [0002] The difference between fire flooding and other oil recovery methods is that it uses part of the heavy components in the oil layer as fuel, continuously burns to generate heat, and drives out the crude oil in the oil layer. At present, the world's fire flooding production is about 5000t / d , mainly concentrated in oil-producing countries such as the United States, Canada, Venezuela, and Romania. The practice of fire flooding in foreign countries proves that fire flooding can indeed recover light oil or heavy oil reservoirs in homogeneous sandstone bodies, and a large number of successful fire flooding recovery rates have reached 50-80%, which also proves this point. Fire flooding Oil production has been car...

AI Technical Summary

Problems solved by technology

The practice of fire flooding in foreign countries proves that fire flooding can indeed recover light oil or heavy oil reservoirs in homogeneous sandstone bodies, and a large number of successful fire flooding recovery rates have reached 50-80%, which also proves this point. Fire flooding Oil production has been carried out in Xinjiang, Shengli and Liaohe oilfields in China, such as the heavy oil block of Shuguang 66# group in Liaohe oilfield and Majiapumiao block 5, and oil flow has been obtained, but the fire flooding methods are all in sandstone and glutenite reservoirs However, for metamorphic rock reservoir fractures and double porosity reservoirs with high pour point oil (freezing point 45°C), due to tight rock formations and low porosity and permeability, oil recovery by fire flooding has never been carried out. The 10 million tons of high pour point oil in proven metamorphic rock fissure reservoirs increases new energy sources. The fire flooding and ignition technology for high pour point oil in metamorphic rock buried hills provided by the present invention can realize the exploitation of high pour point oil in buried hill fractures. The invention has been checked in world patents and documents, and journals have not reported it

Images