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A Huff and Puff Oil Recovery Method for Combustion Reservoir

A technology of burning oil layers and oil layers, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of low-temperature oxidation of formations, improve single well productivity, ensure safe and smooth implementation, and avoid oil layer permeability decline Effect

Active Publication Date: 2017-10-20
BEIJING PUXIN PETROLEUM TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly aims to solve the problem of formation low-temperature oxidation and ground safety caused by oxygen concentration in the fire huff and puff mining technology, and provides a safe fire oil layer huff and puff oil recovery method that can control oxygen and prevent explosions, and prevent light oil and methane from being cracked by crude oil and fire. Return to the wellbore or the surface together with unconsumed oxygen and cause an explosion

Method used

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  • A Huff and Puff Oil Recovery Method for Combustion Reservoir
  • A Huff and Puff Oil Recovery Method for Combustion Reservoir
  • A Huff and Puff Oil Recovery Method for Combustion Reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In a high-pressure combustion tube with a length of 2m and an inner diameter of 5cm, an indoor experiment was carried out to control the oxygen concentration and prevent explosion accidents in the process of huff and puff recovery of incinerated oil layers. Inside the combustion tube is an artificial core with a permeability of about 3×10 -3 μm 2 , the porosity is 37%, the oil saturation is 78%, and the crude oil viscosity is 5100mPa.s. The gas injection pressure was maintained at about 4 MPa during the experiment.

[0033] 1) Use an electric igniter to ignite the oil sand at one end of the combustion tube, continuously inject air to push the combustion front to 0.5m along the combustion tube, and inject a total of 62 standard liters of air;

[0034] 2) Stop air injection, and transfer nitrogen gas 62×40×0.37÷300=3.05 standard liters;

[0035] 3) The well was recovered after 5 minutes of simmering, and the oxygen content in the produced gas components was less than 0...

Embodiment 2

[0037] In a high-pressure combustion tube with a length of 2m and an inner diameter of 5cm, an indoor experiment was carried out to control the oxygen concentration and prevent explosion accidents in the process of huff and puff recovery of incinerated oil layers. Inside the combustion tube is an artificial core with a permeability of about 3×10 -3 μm 2 , the porosity is 37%, the oil saturation is 78%, and the crude oil viscosity is 5100mPa.s. The gas injection pressure was maintained at about 4 MPa during the experiment.

[0038] 1) Use an electric igniter to ignite the oil sand at one end of the combustion tube, continuously inject air to push the combustion front to 0.5m along the combustion tube, and inject a total of 62 standard liters of air;

[0039] 2) Stop air injection, transfer steam 62×0.37÷900=0.0254 kg;

[0040] 3) The well was recovered after 5 minutes of simmering, and the oxygen content in the produced gas components was less than 0.5%, and no low-temperatu...

Embodiment 3

[0042] Reservoir 1 The depth of the reservoir is 800m; the thickness of the oil layer is 19.6m; the permeability of the oil layer is 610×10 -3 μm 2; Reservoir temperature 32°C; Crude oil viscosity 5100mPa.s; Crude oil density 0.9240g / cm 3 ; Oil saturation is 58.9%; formation fracture pressure is 18MPa.

[0043] 1) Perforate the oil well casing, and use hydraulic fracturing technology to press out 40m long artificial fractures, and fill the fractures with fracturing proppant. The main construction parameters include—accumulatively add 40m of ceramsite with a particle size of 0.425mm to 0.850mm 3 ; Prefluid 40m 3 ; Carrying fluid 105m 3 ; Displacement 3.5m 3 / min; the sand ratio increases step by step, from 10% to 80%, and after reaching the highest sand ratio, add 5m of displacement fluid 3 ;

[0044] 2) Use an electric heater to heat the injected air to above 400°C, continue to inject for 4 days to achieve ignition, and inject air at a speed of 6000m 3 / d;

[0045] 3)...

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Abstract

The invention provides an in-situ combustion puff and huff oil extraction method. The method comprises the steps that the ignition technology is applied, an oil layer of an oil well is ignited; air is injected into the oil well, and the stratum is maintained to be in a high-temperature oxidation combustion state; after air injection is finished, nitrogen slugs or steam slugs are injected in the oil well; well soaking is conducted; the well is opened for stoping, wherein the injection amount of nitrogen or steam is determined in the mode that the amount of the injected nitrogen slugs ranges from X*P*phi / 300 scf to X*P*phi / 200 scf, the injection amount of the steam ranges from X*phi / 900 tons to X*phi / 500 tons, X represents the air injection amount with the unit of standard cubic feet, P represents the pressure obtained when the air injection is finished, the unit of P is barometric pressure, and phi represents oil layer porosity and is counted in decimals. By means of the method, the oxygen concentration in the combustion puff and huff thickened oil extracting and stoping process can be controlled, and the safety accidents such as explosions caused by crude oil, light oil obtained through combustion pyrolysis, methane and unconsumed oxygen which back flow to a well shaft or the ground face together are avoided.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation, and particularly relates to a safe oil recovery method for continuously injecting nitrogen or steam slugs to control the oxygen concentration in the process of recovering and preventing explosion during the process of huffing and puffing oil recovery by burning oil layers and after air injection. Background technique [0002] At present, China's heavy oil development methods mainly include steam stimulation (about 78%), steam flooding (about 10%) and conventional water flooding (about 10%). These methods are simple in process and high in recovery, and are suitable for heavy oil reservoirs with shallow burial depth (less than 1000m). However, for oil reservoirs buried deep (greater than 1500m), water-sensitive oil reservoirs, thin interbedded oil reservoirs, etc., due to the problems of high heat loss rate and high steam injection pressure during steam injection, the production of this type o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/16E21B43/243E21B43/24
CPCE21B43/243E21B43/247
Inventor 梁金中
Owner BEIJING PUXIN PETROLEUM TECH DEV
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