Study On Fire Flooding Development Technology Of Low Permeability Heavy Oil Reservoir

In recent years,although liaohe oilfield has carried out combined stimulation development to alleviate the decline of oilfield production,it cannot solve the fundamental problem--fully utilize the remaining oil between Wells and greatly improve the efficiency of plane displacement;Although steam flooding and SAGD tests have achieved certain results,these two technologies have a narrow reservoir adaptation range and cannot cover the whole heavy oil reservoir.In addition,for other reservoirs with deep burial,poor oil quality,severe water invasion and strong reservoir sensitivity,it is urgent to change the development mode and realize production replacement.Burning oil layer is an effective eor technology.Its principle is to generate heat and pressure by burning a small amount of formation crude oil,thus reducing the viscosity of formation crude oil.This technology can effectively improve oil displacement efficiency,reduce energy consumption,and maximize the goal of enhanced oil recovery.Of this study is to start from the burning mechanism of fire flooding,through the low permeability reservoir thermal cracking of heavy oil viscosity modified physical simulation research and analysis of mineral catalysis and viscosity of water thermal cracking modification effect,in the manifold Liao 1 block for low permeability heavy oil reservoir geology between,on the basis of fire flooding in low permeability development characteristics of the filter,and further by using the method of numerical simulation verify liao 1 piece of the feasibility of using fire flooding development,and optimizing the operating parameters at the same time,to ensure the smooth implementation of the pilot test area finally.The results show that:through elemental analysis of pyrolysis residues and calculation of H/C atomic ratio,it is found that in the same time,the higher the reaction temperature,the lower the H/C atomic ratio gradually.The combustion heat of pyrolysis residue increases gradually with the reaction temperature,indicating that the combustion heat of pyrolysis residue is closely related to the atomic ratio of residue H/C.Liao1block in the low-permeability block adopts 100-150m linear staggered well network and the ignition temperature is greater than 450?.The initial gas injection intensity is 500Nm~3/(m.d),the maximum gas injection intensity is 1500-2000nm~3/(m.d),and the monthly increment of gas injection intensity is 75Nm~3/(m.d).This block can achieve better development effect of fire drive.