chapter  3
34 Pages

- Assessment of the Potential of Enhanced Oil Recovery From Reservoirs With High Water Content Using the Heat of Nitrate Oxidation Reactions and in situ Hydrocarbon Oxidation

E. N. ALEKSANDROV, P. E. ALEKSANDROV, N. M. KUZNETSOV, A. L. PETROV, and V. YU. LIDZHI-GORYAEV

3.1 Introduction .................................................................................... 41 3.2 Experimental .................................................................................. 42

3.2.1 Control of BM Reaction Temperature Under Down Hole and Reservoir Conditions ................................................... 42

3.3 Results and Discussion .................................................................. 47 3.3.1 Absorption of Gas by Oil and Creation of Gas Lift ........... 47

3.4 Heat of Formation for Mean and Application of Mean-based Binary Mixtures at Oil Production Sites ........................................ 48 3.4.1 Heat of Formation for MEAN ........................................... 49 3.4.2 Decomposition Products of MEAN ................................... 49

3.5 Assessment of the Potential Use of High-temperature Binary Mixture Reaction When Exploiting Reservoirs With High Water Content ................................................................................ 53

3.6 Pressure Drainage as an Alternative to Gravity Drainage and Thermochemical Gas Lift Effect as an Alternative to Electric Pump [19-22] ................................................................................ 54

3.7 Methods for Increasing Reservoir Pressure by Means of Exothermic Gas-producing Reactions as a More Efficient Alternative to Technologies that Increase Water Content .............. 56 3.7.1 Reservoir Heating With Bottomhole Gas Generator

Burning Hydrocarbons Injected From the Surface ............. 57 3.7.2 Oil Recovery via Direct Oxidation of Reservoir

Hydrocarbons by Air Oxygen ............................................. 58 3.8 Conclusion ..................................................................................... 58 Keywords ................................................................................................ 60 References .............................................................................................. 60

3.1 INTRODUCTION

A technique is described for enhanced oil recovery using the heat and gas produced by ammonium and organic decomposition reactions taking place in wellbores and reservoirs. A comparative analysis is presented of the contributions to the process from decomposition reactions of inorganic (ammonium) and organic (monoethanolamine, MEAN, HO-CH2CH2-NH3

produced is higher and the heat of reaction is lower for high-temperature reaction of MEAN as compared to ammonium nitrate, and the opposite is true for low-temperature reactions. Field tests and calculations have demonstrated that binary mixture technology can provide an alternative to well-known technologies of enhanced oil recovery. Three methods are proposed for stimulating reservoirs via absorption of gas by oil and ensuing reduction of reservoir fluid viscosity and density. Heterogeneous catalytic processes that occur in heated reservoirs must be analyzed and taken account of as promising research directions in thermochemical oil recovery methods.