CN104110244A - Downhole chemical heat-releasing ignition method of heavy oil reservoir fireflooding well - Google Patents
Downhole chemical heat-releasing ignition method of heavy oil reservoir fireflooding well Download PDFInfo
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- CN104110244A CN104110244A CN201310137111.2A CN201310137111A CN104110244A CN 104110244 A CN104110244 A CN 104110244A CN 201310137111 A CN201310137111 A CN 201310137111A CN 104110244 A CN104110244 A CN 104110244A
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Abstract
The invention belongs to the technical field of heavy oil reservoir in-situ combustion thermal recovery, and particularly relates to a process method for adopting a chemical heat-releasing ignition method to ignite near-wellbore-area oil reservoirs in a fireflooding well. The chemical heat-releasing ignition method includes the following steps that (1), according to difference in thickness of to-be-ignited oil reservoirs, 200-1000g of fuze package is put in a fireflooding air injection well, wherein an ignition agent and charcoal or hemp rope with combustion-assisting liquid sprinkled on are contained in the package; (2), according to air quantity needed for complete combustion of fuze of unit mass, air is injected into a wellbore at a speed of 0.6-2.5squar/min kg; (3), when the ignition agent in the fuze package contacts with water at the bottom of the well or is affected with damp, the ignition agent instantly releases high-density heat to ignite the fuze, and the fuze continues to release heat to ignite heavy oil at a near-wellbore area. The chemical ignition agent is inorganic metal oxide which is large in heat releasing quantity, high heat-releasing density, free of pollution, low in price and stable in property, the chemical ignition agent reacts with the water to release heat and can instantly ignite inflammable materials. The ignition process method completely meets downhole construction conditions of the heavy oil reservoir fireflooding well.
Description
Technical field
The invention belongs to heavy crude reservoir combustion in situ thermal recovery technical field, relate in particular in fireflood well down-hole, adopt the ignition method of chemical exothermal, the process of the near wellbore zone oil reservoir that ignites.
Background technology
Along with the lasting of China's demand for energy risen, the exploitation dynamics that this viscosity of viscous crude difficulty high, that density is large, filtrational resistance is large is employed to oil reservoir is also continuing to increase.
Because viscous crude is very responsive to temperature, temperature height can make that viscosity of thickened oil reduces, mobility strengthens, for the general thermal stimulation both at home and abroad of production of heavy oil reservoir cost-effectively.
Oil recovery by heating is mainly by some technological measures, reservoir temperature to be raise, and reduces viscosity of thickened oil, viscous crude is easily flowed, thereby by viscous crude extraction, its main method has steam soak, steam flooding, combustion in situ, hot water flooding etc.
Combustion in situ, as a kind of mode of heavy crude heat extraction, also quietly rises gradually in China.The combustion in situ of combustion in situ is that its mechanism of action is, after heating, oil viscosity reduces, and permeability saturation curve changes, towards favourable ten future developments that recover the oil; The distillation of crude oil after heating, makes easy ten outputs of light component in crude oil; Meanwhile, heat the thermal expansion of rear fluid and rock, increased the pressure energy on stratum.
It is that one should be main with thermal effect for combustion in situ main method, is the thermal process that can improve oil recovery factor, and situ combustion technology is a kind of oil recovery by heating method with obvious technical advantage and potentiality.
The key technology of combustion in situ is a layer interior ignition method, and efficient, safe sparking mode is the successful key factor of combustion in situ.
In order to form burning in heavy crude reservoir oil reservoir, first must light the crude oil in the oil reservoir of fireflood well near wellbore zone, can realize combustion in situ.And fireflood well near wellbore zone oil reservoir is lighted the quality of degree, the final effect of combustion in situ will directly be affected again.Therefore, fireflood well near wellbore zone oil layer ignition technology is one of key technology in combustion in situ oil production method.
In the well of combustion in situ firing technique employing at present, lay the igniting of the mechanical system such as igniter, Heat artificially oil reservoir.This class methods amount of having high input (as, cable, heating resistor, monitor etc.) equipment, construction cost increases.Because viscosity of thickened oil is high, need a large amount of heat could melt cracking, be also the not good reason of mechanical system ignition effectiveness.
By the means of the chemical exothermal oil reservoir that ignites, be to adopt eremacausis to glow or reservoir is lighted in the spontaneous combustion of organic material mostly.Oil reservoir eremacausis is glowed, and required time is long, ignition effectiveness is low; And organic substance, on the one hand, in air autoignition temperature low, burn rapid, wayward, engineering adaptability is poor; On the other hand, high volatility, serious at porous mass surface leak-off, is also the inefficient reason that causes igniting.In addition, the reasons such as chemicals is expensive, well site poor operability, difficult preservation, cause chemic ignition technique not to be used.
Summary of the invention
The present invention is intended to overcome on the basis of prior art deficiency, provide a kind of can be efficiently, the heavy crude reservoir fireflood well down-hole chemical exothermal ignition method of economic, easy, safety, environmental protection.
In order to achieve the above object, the concrete implementation and operation of the present invention is as follows:
(1) according to by the difference of light fluid layer thickness, in fireflood air Injection well, throw in 200 grams of-1 kilogram of fuse parcels, ignition powder is housed in parcel and drenches the charcoal or the rope made of hemp that there are combustion-supporting property liquid.
(2) by unit mass fuse completing combustion required air quantity, by 0.6-2.5 side/point kilogram speed in pit shaft, inject air.
(3) after the ignition powder in fuse parcel contacts with shaft bottom water or makes moist, abrupt release high density heat is lighted fuse, continues release heat by fuse, and near wellbore zone viscous crude is ignited.
The invention provides that a kind of thermal discharge is large, heat release density is high, pollution-free, cheap, the inorganic, metal oxide of stable in properties is as down-hole ignition powder, utilize this material and water exothermic heat of reaction, moment the characteristic that combustibles can be lighted to light under completed well the object of fuse and then the near wellbore zone oil reservoir that ignites.The ignition process adopting in this invention meets heavy crude reservoir fireflood well underground construction condition completely.
Detailed description of the invention
Heavy crude reservoir fireflood well down-hole chemical exothermal ignition method implementation step:
(1) determining after baked wheaten cake oil reservoir block, by to geology, Logging data analysis, according to by the difference of light fluid layer thickness, in fireflood air Injection well, throw in 200 grams of-1 kilogram of fuse parcels, ignition powder is housed in parcel and drenches the charcoal or the rope made of hemp that there are combustion-supporting property liquid.
(2) by unit mass fuse completing combustion required air quantity, by 0.6-2.5 side/point kilogram speed in pit shaft, inject air.
(3) after the ignition powder in fuse parcel contacts with shaft bottom water or makes moist, abrupt release high density heat is lighted fuse, continues release heat by fuse, and near wellbore zone viscous crude is ignited.
The present invention is when in fuse bag at down-hole ignition method, ignition powder is met after water, and medicine reacts with water reactive chemistry emits a large amount of highdensity heat then, and moment has charcoal or the rope made of hemp of combustion-supporting property liquid to light pouring, by the heat release that burns away of the charcoal of lighting or the rope made of hemp, near wellbore zone viscous crude is lighted.
Claims (3)
1. the present invention has introduced one in heavy crude reservoir combustion in situ thermal recovery technical field, the means of applied chemistry exothermic heat of reaction, the process of the near wellbore zone oil reservoir that ignites in fireflood well down-hole.The method can be carried out as follows:
(1) according to by the difference of light fluid layer thickness, in fireflood air Injection well, throw in 200 grams of-1 kilogram of fuse parcels, ignition powder is housed in parcel and drenches the charcoal or the rope made of hemp that there are combustion-supporting property liquid.
(2) by unit mass fuse completing combustion required air quantity, by 0.6-2.5 side/point kilogram speed in pit shaft, inject air.
(3) after the ignition powder in fuse parcel contacts with shaft bottom water or makes moist, abrupt release high density heat is lighted fuse, continues release heat by fuse, and near wellbore zone viscous crude is ignited.
2. according to the chemical exothermal ignition process described in right 1, it is characterized in that: described chemic ignition medicament is the sodium peroxide powder that paper using is wrapped in, the 0.2-3% that its consumption is pressed other oxidizer quality in fuse bag calculates.
3. according to the chemical exothermal ignition process described in right 1 and right 2, it is characterized in that: described air Injection amount and injection rate are to carry out designing and calculating by unit mass fuse completing combustion required air quantity, by 0.6-2.5 side/point kilogram speed in pit shaft, inject air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310137111.2A CN104110244A (en) | 2013-04-19 | 2013-04-19 | Downhole chemical heat-releasing ignition method of heavy oil reservoir fireflooding well |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310137111.2A CN104110244A (en) | 2013-04-19 | 2013-04-19 | Downhole chemical heat-releasing ignition method of heavy oil reservoir fireflooding well |
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| CN104110244A true CN104110244A (en) | 2014-10-22 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104453819A (en) * | 2014-11-11 | 2015-03-25 | 中国石油天然气股份有限公司 | Chemical ignition method for in-situ combustion |
| CN104594863A (en) * | 2014-11-24 | 2015-05-06 | 中国石油天然气股份有限公司 | Method for reinforcing in-situ combustion exploitation oil reservoir |
| CN105368513A (en) * | 2015-09-30 | 2016-03-02 | 中国石油天然气股份有限公司 | Fireflooding chemical ignition combustion improver and ignition method |
| CN106368662A (en) * | 2015-07-23 | 2017-02-01 | 中国石油天然气股份有限公司 | Evaluation method for recovery ratio |
-
2013
- 2013-04-19 CN CN201310137111.2A patent/CN104110244A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104453819A (en) * | 2014-11-11 | 2015-03-25 | 中国石油天然气股份有限公司 | Chemical ignition method for in-situ combustion |
| CN104594863A (en) * | 2014-11-24 | 2015-05-06 | 中国石油天然气股份有限公司 | Method for reinforcing in-situ combustion exploitation oil reservoir |
| CN104594863B (en) * | 2014-11-24 | 2017-09-01 | 中国石油天然气股份有限公司 | It is a kind of to strengthen the method that combustion in situ exploits oil reservoir |
| CN106368662A (en) * | 2015-07-23 | 2017-02-01 | 中国石油天然气股份有限公司 | Evaluation method for recovery ratio |
| CN106368662B (en) * | 2015-07-23 | 2019-04-09 | 中国石油天然气股份有限公司 | The evaluation method of recovery ratio |
| CN105368513A (en) * | 2015-09-30 | 2016-03-02 | 中国石油天然气股份有限公司 | Fireflooding chemical ignition combustion improver and ignition method |
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Application publication date: 20141022 |