CN102900414A - Steam-flue gas mixing fluid generation method for thickened oil thermal recovery - Google Patents

Abstract

The invention relates to a steam-flue gas mixed fluid generating method for thermal recovery of heavy oil, which belongs to the technical field of thermal recovery of heavy oil and boiler equipment. The generating system includes a boiler, a transition flue and a mixing chamber. Gas or liquid fuel and air are fed into the furnace of the boiler under pressure, mixed and burned in the furnace to generate high-temperature and high-pressure flue gas, which is sent into the mixing chamber through the transitional flue; the purified water is sprayed into the mixing chamber through the atomization equipment to form Fine droplets, small droplets are mixed with high-temperature and high-pressure flue gas in the mixing chamber, and are heated by the flue gas to become water vapor after vaporization, thereby generating high-temperature and high-pressure steam-flue gas mixed fluid; finally, the high-temperature and high-pressure steam-flue gas The gas mixed fluid is led to the steam injection pipeline. The method reduces flue gas purification and compression links, effectively saves investment and operating costs, saves water resources, and significantly reduces water treatment costs.

Description

A kind of steam for heavy crude heat extraction-flue gas fluid-mixing method for generation

Technical field

The present invention relates to a kind of method for generation of producing high temperature and high pressure steam-flue gas fluid-mixing, belong to heavy crude heat extraction and boiler unit technical field.

Background technology

In recent years, along with heavy crude heat extraction effectiveness variation year by year, viscous crude field was in by steam soak in succession to transition period that other mining type is changed.In various substituted technique, it is most potential a kind of method that flue gas and steam mixed water injection are handled up.Existing notes flue gas result of the test shows, utilizes the onlap effect of flue gas can improve the development degree of top oil reservoir; Utilize the compressible performance of flue gas to can be oil well production displacement of reservoir oil power is provided; Utilize CO ₂Carboxylation can reduce viscosity of crude; Utilize the low-temperature oxidation effect of oxygen in the flue gas and the fluid-channeling channel that steam is stopped up in carbonization, improve the oil reservoir steam entry profile, increase steam swept volume coefficient, thereby improve the vertical development degree of Heavy Oil Reservoir, provide a new approach for the huge thick heavy crude reservoir of deep layer further improves development effectiveness.

Conventional realize that the method for flue gas steam mixed water injection is to adopt compressor unit, inject with vapor mixing after flue gas is forced into steam pressure, the after-treatments such as therefore, this method need to dewater to flue gas, purifies, lowers the temperature, pressurization.Because exhaust gas volumn is larger, dewater, purify, the process equipment such as pressurization is numerous and jumbled, invest hugely, limited large-scale application.Based on considering of above factor, can be directly used in the method for generation of the high temperature and high pressure steam of heavy crude heat extraction-flue gas fluid-mixing in the urgent need to a kind of production, to satisfy the needs of actual production.

Summary of the invention

Problems such as the objective of the invention is mixed to live that flue gas dewaters in the method in order to solve existing flue gas steam, purify, the process equipment such as pressurization is numerous and jumbled, investment is huge, large-scale application is difficult proposes the method for generation of the high temperature and high pressure steam that a kind of production can be directly used in heavy crude heat extraction-flue gas fluid-mixing.

Technical scheme of the present invention is as follows:

A kind of steam for heavy crude heat extraction-flue gas fluid-mixing method for generation is characterized in that described method comprises the steps:

1) gas or liquid fuel and air are sent into boiler furnace through pressurization, in burner hearth, mix, burning, produce high temperature and high pressure flue gas, sent in the mixing chamber by transition flue duct;

2) will purify waste water and spray in the mixing chamber by atomization plant, and form fine drop, fine drop is mixed in mixing chamber with high temperature and high pressure flue gas, and is heated up by flue gas, becomes steam after the vaporization, and then generation high temperature and high pressure steam-flue gas fluid-mixing;

3) high temperature and high pressure steam-flue gas fluid-mixing is led to steam injecting pipe.

Among the present invention, described gaseous fuel preferably adopts natural gas or synthesis gas; Liquid fuel preferably adopts heavy oil.The temperature of described high temperature and high pressure flue gas is 1000～1500 ℃, and pressure is 5～9MPa.The temperature of high temperature and high pressure steam-flue gas fluid-mixing is 250 ~ 400 ℃, and pressure is 5 ~ 9MPa.

The present invention has the following advantages and the high-lighting effect: 1. adopt gas or liquid fuel, catch fire easily, after-flame is quick, thereby boiler can be arranged to reduced size, can be according to the field condition flexible arrangement; 2. adopt the adiabatic boiler of high pressure, the compression of flue gas is convenient in the compression distant place of gas or liquid fuel and air, and has reduced gas cleaning and compression link, effectively saves cost of investment and running cost; 3. adopt and purify waste water directly and smoke contact heat exchange, water supply volume is less, saving water resource; 4. owing to there is not heating surface, thereby the requirement of water quality is significantly reduced, condensed oil sewage only needs simple process to come into operation, and significantly reduces cost of water treatment.

Description of drawings

Fig. 1 is for realizing a kind of theory structure schematic diagram of producing high temperature and high pressure steam-flue gas generation systems of the present invention.

Among the figure: 1-gas or liquid fuel and air; 2-boiler; 3-transition flue duct; 4-purify waste water; 5-mixing chamber; 6-high temperature and high pressure steam-flue gas fluid-mixing.

The specific embodiment

Further specify principle of the present invention, concrete structure and preferred forms below in conjunction with accompanying drawing.

Fig. 1 is for realizing a kind of theory structure schematic diagram of producing high temperature and high pressure steam-flue gas generation systems of the present invention, and this system comprises boiler 2, transition flue duct 3 and mixing chamber 5.The wall of boiler, transition flue duct and mixing chamber all is furnished with adiabatic temperature-resistant material in the native system.The method is at first sent into boiler furnace with gas or liquid fuel and air 1 through pressurization, mixes in burner hearth, burning, produces high temperature and high pressure flue gas, is then sent in the mixing chamber 5 by transition flue duct 3; To purify waste water and 4 spray in the mixing chamber 5 by atomization plant, make the formation fine drop of purifying waste water, fine drop and high temperature and high pressure flue gas are in 5 interior mixing of mixing chamber, and heated up by flue gas, become steam after the vaporization, and then produce high temperature and high pressure steam-flue gas fluid-mixing 6, again high temperature and high pressure steam-flue gas fluid-mixing 6 is led to steam injecting pipe.

Its fuel adopts gas or the liquid fuel that does not contain ash content, and gaseous fuel can adopt natural gas or synthesis gas, but is not limited to this; Liquid fuel adopts heavy oil, also can adopt other liquid fuel.Gas or liquid fuel and air 1 are sent into the burner hearth of boiler 2 through pressurization, mix in burner hearth, burning, produce high temperature and high pressure flue gas, its temperature control is in 1000～1500 ℃ of scopes, and pressure is 5～9MPa; The high temperature and high pressure flue gas that produces is sent in the mixing chamber 5 by transition flue duct 3; To purify waste water simultaneously and 4 spray in the mixing chamber 5 by atomization plant, form fine drop, fine drop and high temperature and high pressure flue gas are in 5 interior mixing of mixing chamber, and heated up by flue gas, become steam after the vaporization, and then produce high temperature and high pressure steam-flue gas fluid-mixing 6, and its temperature is 250 ~ 400 ℃, pressure is 5 ~ 9MPa; Finally, high temperature and high pressure steam-flue gas fluid-mixing 6 is led to steam injecting pipe.

Purify waste water fully for what guarantee to spray into that vaporization becomes saturated vapour, the quality m that purifies waste water that the unit interval sprays into ₁With flue gas quality m ₂Have certain proportioning K, preferred forms of the present invention also will be controlled around this proportioning.Proportioning K can calculate according to following formula:

$\left\{\begin{array}{c}K=\frac{m_1}{m_2}=\mathrm{\α}{K}_0\\ K_0=\frac{I_{21}-I_{22}}{I_{12}-I_{11}}\end{array}\right.$

In the formula, m ₁Spray into the quality of purifying waste water of mixing chamber for the unit interval; m ₂Enter the flue gas quality of mixing chamber for the unit interval; K is the actual proportioning that sprays into purify waste water quality and the flue gas quality of mixing chamber the unit interval; α is stoichiometric factor, 0＜α≤1; K ₀For under the perfect condition hypothesis drop mix with flue gas, when vaporescence does not have thermal loss, the unit interval sprays into the stoichiometric(al) of purify waste water quality and the flue gas quality of mixing chamber; I ₁₁For spraying into the enthalpy of purifying waste water of mixing chamber; I ₂₁For entering the flue gas enthalpy of mixing chamber; I ₁₂Be steam enthalpy in steam-flue gas fluid-mixing; I ₂₂Be flue gas enthalpy in steam-flue gas fluid-mixing.

Claims (4)

1. A steam-flue gas mixed fluid generation method for heavy oil thermal recovery, characterized in that said method comprises the steps: 1) Gas or liquid fuel and air (1) are pressurized and sent into the boiler (2) furnace, where they are mixed and burned to generate high-temperature and high-pressure flue gas, which is sent into the mixing chamber (5) through the transition flue (3) Inside; 2) Spray purified water (4) into the mixing chamber (5) through atomization equipment to form fine droplets, which are mixed with high-temperature and high-pressure flue gas in the mixing chamber (5) and heated by the flue gas. After being vaporized, it turns into water vapor, and then produces a high-temperature and high-pressure steam-flue gas mixed fluid (6); 3) Lead the high-temperature and high-pressure steam-flue gas mixed fluid (6) to the steam injection pipeline. 2. A method for generating steam-flue gas mixed fluid for thermal recovery of heavy oil according to claim 1, characterized in that: said gaseous fuel is natural gas or synthetic gas; liquid fuel is heavy oil. 3. A steam-flue gas mixed fluid generating method for heavy oil thermal recovery according to claim 1, characterized in that: the temperature of the high temperature and high pressure flue gas is 1000-1500°C, and the pressure is 5-9MPa. 4. A steam-flue gas mixed fluid generation method for heavy oil thermal recovery as claimed in claim 1, characterized in that: the temperature of the high-temperature and high-pressure steam-flue gas mixed fluid is 250-400°C, and the pressure is 5 ~9MPa.