CN116066016A - Realization method for underground heat source of oil and gas well - Google Patents
Realization method for underground heat source of oil and gas well Download PDFInfo
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- CN116066016A CN116066016A CN202111290646.4A CN202111290646A CN116066016A CN 116066016 A CN116066016 A CN 116066016A CN 202111290646 A CN202111290646 A CN 202111290646A CN 116066016 A CN116066016 A CN 116066016A
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- reaction
- thermite
- oil
- reaction charge
- heat source
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000006243 chemical reaction Methods 0.000 claims abstract description 78
- 239000003832 thermite Substances 0.000 claims abstract description 62
- 238000007789 sealing Methods 0.000 claims abstract description 29
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000003921 oil Substances 0.000 claims abstract description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000005553 drilling Methods 0.000 claims abstract description 6
- 238000002485 combustion reaction Methods 0.000 claims abstract description 5
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 5
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 3
- 239000003085 diluting agent Substances 0.000 claims description 10
- 238000007133 aluminothermic reaction Methods 0.000 claims description 9
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical group [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 5
- 239000000292 calcium oxide Substances 0.000 claims description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 5
- 239000007800 oxidant agent Substances 0.000 claims description 5
- 230000001590 oxidative effect Effects 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract description 8
- 150000004706 metal oxides Chemical class 0.000 abstract description 8
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 6
- 239000000155 melt Substances 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
- 238000002844 melting Methods 0.000 abstract description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 abstract description 3
- 230000009471 action Effects 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract description 2
- 239000006023 eutectic alloy Substances 0.000 abstract 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 abstract 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 229910000423 chromium oxide Inorganic materials 0.000 abstract 1
- 239000003112 inhibitor Substances 0.000 abstract 1
- 230000036632 reaction speed Effects 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 239000000654 additive Substances 0.000 description 6
- 235000013980 iron oxide Nutrition 0.000 description 6
- 239000000376 reactant Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000009472 formulation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- -1 V2O5 Chemical class 0.000 description 1
- 229910002065 alloy metal Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006664 bond formation reaction Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003886 thermite process Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/008—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones using chemical heat generating means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Sealing Material Composition (AREA)
Abstract
The realization method and application of the underground heat source for the oil and gas well mainly comprise the following four steps: and 1, a drilling tool is put in, 2, a falling basket is opened when the drilling tool reaches a preset position, 3, the reaction materials are filled for reaction, and 4, the gap is pressurized and filled for sealing. The specific process comprises the following steps: using thermite reactions at a location downhole: the ignition agent and the combustion improver are added, and aluminum reacts with metal oxides (such as ferric oxide, chromium oxide, manganese dioxide and the like) under the high-heat condition. The released heat melts the eutectic alloy material with low melting point, the melted alloy reaches the sealing area under the action of pressure, and the reaction pressure, temperature and reaction speed are controlled by adding inhibitors such as metal oxide, silicon dioxide and the like. The sealing downhole is achieved by the expansion properties of the eutectic alloy.
Description
Technical Field
The invention relates to an implementation method for an underground heat source of an oil and gas well and application thereof. The invention is used for well repairing operation of oil and gas production wells, well integrity sealing, well sealing for underground nuclear waste storage, carbon dioxide sealing and the like, and other applications.
Background
The term "thermite reaction" as used in this patent refers to a broad class of chemical reactions that can be defined as an exothermic reaction, including metal and non-metal oxides that react with each other to form a more stable oxide and the corresponding reactant metal or non-metal oxide.
The aluminothermic process was invented by the german chemist Hans. Singdssmith (Hans Goldschmidt) 1893 and patented after two years. The reaction is therefore also referred to as "Goldsmith" or "Goldsmith process". The original objective of the study was to produce high purity metals without carbon smelting, but the Goodsmith sharp thermite method was found to be useful for welding. In 1899, the thermite process was first commercially applied to welded rails in the germany aesen.
The thermite is a mixture prepared by mixing aluminum powder and high-melting metal oxide (such as ferric oxide powder) according to a proportion, when in use, the mixture is added with oxidant for ignition, the reaction is carried out vigorously, aluminum oxide and simple substance are obtained, a large amount of heat is emitted, the temperature can reach about 2500 ℃, and the generated simple substance can be melted. This reaction is called the thermite reaction. The thermite reaction principle can be applied to production, such as welding steel rails and the like. Certain metal oxides (such as V2O5, cr2O3, mnO2 and the like) can be used for replacing ferric oxide, and can also be used as thermite. When aluminum powder reacts with these metal oxides, sufficient heat is generated to cause the reduced metal to be in a molten state at higher temperatures and to separate from the slag formed, thereby obtaining purer metal. Such methods are commonly used in industry to smelt refractory metals such as vanadium, chromium, manganese, and the like. The use of an exotherm as aluminum is oxidized.
Thermite has been used in the drilling industry for blowout prevention (U.S. patent 5159983), for perforated sealing sleeves for explosions (U.S. patent 5613557), for gas generating downhole tool drives (U.S. patent 6925937), for perforating and hydraulic fracturing (U.S. patent application publication 2011/0146519) and for downhole metal bond formation members (U.S. patent application publication 2012/0255742). There are many other patents for welding and dismantling thermite in surface applications, but these are considered to be irrelevant to the application of drilling and completion seals.
Disclosure of Invention
The invention aims at overcoming the defects in the prior art and provides an implementation method for an underground heat source of an oil and gas well.
The sealing device is used for well repairing operation of oil and gas production wells, well integrity sealing, sealing of wells for underground nuclear waste storage, carbon dioxide sealing and the like, and other applications.
The technical scheme is as follows:
the realization method for the underground heat source of the oil and gas well comprises the following steps:
and (3) the falling basket is put into a well sealing position through a drilling tool, an aluminothermic reaction charge is placed on the falling basket, the aluminothermic reaction charge is ignited, and the well sealing operation is finished after the aluminothermic reaction charge is burnt.
Further, the pressurizing is carried out in the process of burning the aluminothermic reaction charge.
Further, the surface of the falling basket is coated with an insulating compact bearing material.
Further, the thermite reaction charge comprises an oxidant and aluminum powder, and the proportion is 3:1.
further, the oxidant is iron powder or iron oxide.
Further, the thermite reaction charge is ignited from above, causing the thermite reaction charge to burn from top to bottom.
Further, the thermite reaction charge comprises a diluent.
Further, the diluent is calcium oxide, aluminum oxide or silicon dioxide.
Further, the thermite reaction charge is diluted by mass by the diluent by an amount between 5% and 75%.
Further, the thermite reaction charge is diluted by mass by the diluent by an amount between 10% and 50%.
Further, the reaction rate of the diluted thermite reaction charge is reduced to 0.5-1 cm/sec.
The beneficial effects of the invention are as follows:
the well repairing operation and the well integrity sealing of the oil and gas production well are realized, and the reliable sealing of the wells such as underground nuclear waste storage, carbon dioxide sealing and the like is realized.
Drawings
FIG. 1 is a schematic view of a running tool;
FIG. 2 is a schematic view of an open drop basket positioning;
FIG. 3 is a schematic illustration of a packed thermite reaction charge;
fig. 4 is a schematic diagram of pressurization.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
The invention discloses a method for realizing underground heat source and sealing a well, which comprises the following steps of lowering aluminothermic reactive charge into the well at the position where the well is to be sealed, wherein the aluminothermic reactive charge is arranged on a falling basket; the function of the drop basket is to provide support for the thermite reaction charge at the location; applying a greater mass load to the thermite reaction at the location; the thermite reaction charge at the bottom of the charge is ignited and the thermite reaction is carried out in the thermite reaction charge while a greater pressure load is applied to the thermite reaction charge.
The method includes the steps of lowering a thermite reaction mass at a location of the sealed well, wherein the thermite reaction mass lowered into the well is diluted with one or more additives to dilute calcium oxide, silica, etc., to mitigate exothermic reactions generated upon ignition of the thermite reaction, including lowering the reaction temperature and reaction rate of the thermite reaction to meet specific design goals of the sealed well; and igniting the hot reactant material to burn the hot reactant material, and the released heat melts the low-melting-point alloy metal.
In the non-pressurized thermite reaction, the product is a porous matrix of metal oxide and metal. Porosity is caused by voids entrained during the reaction, some of which remain due to the powder not being compacted to maximum density, others of which are caused by bubbles entrained by the very small amount of gas generated during the reaction. The porosity of the material after the final reaction reduces its potential strength, enabling it to permeate the fluid flow.
The loaded thermite ignites the combustion reaction, so that the porosity of the reaction materials is reduced, and the load is formed by pressing in the reaction process, so that the thermite reaction is more firmly fused into surrounding medium materials. To further reduce the porosity of the final product, an oxide or eutectic material of lower melting point (such as calcium oxide) may be added to the thermite to reduce the melt temperature of the product and maintain its liquid form for a longer period of time. Of course, the precise pressure range of the crimp will depend on the particular application, such as the size of the wellbore, the length of the desired lost circulation zone, the mixture used in the thermite reactive charge, and other factors.
The mass of the stoichiometric mixture of iron oxide and aluminum powder was about 3:1, respectively. At this mixing ratio, the reaction is relatively rapid, violent and difficult to control under atmospheric conditions. It generates a large amount of heat energy, and the peak temperature is close to 2500-3000 ℃.
However, in order to seal the well, the reaction must be controlled to control the reaction products and form an integral melt flowable seal material. The base mixture of diluents and/or additives can be used to control the burn rate, peak temperature, and end product with excellent mechanical properties. For example, diluting the aluminum/iron oxide thermite formulation with aluminum oxide (also the product of the reaction), slowing the reaction, and slowing the reaction rate, allows the thermite reaction to seal completely with little (gas) pressure. The stoichiometric aluminum/iron oxide thermite has a nominal peak temperature of 2965 ℃, while by adding 75% by mass of aluminum oxide powder to the original mixture, the peak reaction temperature can be controlled below 1700 ℃ while still maintaining combustion. A dilution amount greater than this percentage cannot sustain the thermite reaction, so 75% by mass is considered to be a practical upper limit for the dilution amount. The diluted thermite reaction charge results in a slow, controllable reaction rate, as low as 0.1 cm/sec, compared to 10-100 cm/sec for the original/undiluted thermite mixture. We have realized that a slow, controlled thermite reaction at lower temperatures by diluting the thermite reaction is desirable for well sealing applications and may be suitable for a variety of thermite reactant designs for well sealing. A burn rate of about 1 cm/sec is considered suitable for some oil well sealing applications.
In one example, this dilution feature allows the thermite design to have a relatively cool lower portion that reacts first to heat the wellbore to a plastic state rather than a molten state. Radially expanding it and squeezing the casing outwards, thereby filling the annulus between the casing and the wellbore/formation wall. The relatively hot reactive charge of hot aluminum on top of the hot aluminum then ignites and melts through the casing into the rock/formation wall. The cooler lower portion prevents the molten material of the relatively hotter upper plug from flowing into or falling into the annular space between the casing and the formation wall, thereby counteracting the sealing action thereof. The sealing performance is improved by applying radial load by pressure.
An example of this embodiment is shown in fig. 2. To separate the casing from the borehole wall in the formation, an annular gap is provided between the borehole wall and the casing. The aluminothermic reaction materials are placed into the drop basket through a cable or a drill rod, and the drop basket is placed at a position to be sealed in an oil well to bear the aluminothermic agent.
The form of the thermite reaction material, e.g., a mixture of powdered aluminum and iron oxides, has been diluted to ignite upon addition of one or more additives, such as aluminum oxide, calcium oxide, silica thermite reaction to produce a mildly exothermic reaction material. The purpose of slowing down the exothermic reaction is to reduce the reaction temperature and reaction rate within the thermite reaction material that would otherwise be devoid of one or more additives. In this case, the purpose of moderate heating is to heat the casing to a plastic temperature, so that during combustion, radial expansion of the thermic agent causes the casing to expand radially, essentially causing compression of the formation and closing the annular gap.
Thermite igniters may be electrical in nature and any suitable chemical, electrical or pyrotechnic igniter may be used. The details of the igniter are well known to those skilled in the art and are not particularly important.
As shown in fig. 3. After ignition of the igniter, the thermite reaction expansion within the layer progressively squeezes the sleeve radially outwardly to squeeze the sealing area into the cooled expansion seal.
Accordingly, in a first aspect of the present embodiment, a method of sealing a well is disclosed, the method comprising the steps of: and (3) reducing the thermite reactant to the position which needs to be sealed underground, and extruding the sealing area into a cooling expansion seal by gradually extruding the sleeve outwards in the radial direction after the thermite reactant in the layer is expanded after the igniter is ignited. When the thermite reaction, which is produced by the mild one exothermic reaction, has been ignited with the addition of one or more diluent additives, that is, in the absence of one or more additives, the reaction temperature and reaction rate within the thermite reaction charge is greatly reduced to meet the specific design target requirements of the sealed well and the thermite reaction charge is ignited to burn the thermite reaction charge, as shown in fig. 4: the pressurized reaction materials are extruded into the sealing area to be cooled and expanded for sealing.
Notably, many metal/oxide thermite formulations may be used to achieve a particular goal. The basic formulation of aluminum/iron oxide described herein is for purposes of example and not limitation, and it is to be understood that other thermite reaction formulations may be suitable for particular applications.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (11)
1. The realization method for the underground heat source of the oil and gas well is characterized by comprising the following steps of:
and (3) the falling basket is put into a well sealing position through a drilling tool, an aluminothermic reaction charge is placed on the falling basket, the aluminothermic reaction charge is ignited, and the well sealing operation is finished after the aluminothermic reaction charge is burnt.
2. The method of claim 1, wherein the pressurizing is performed during combustion of the thermite reaction charge.
3. The method of claim 2, wherein the surface of the landing basket is coated with an insulating dense load bearing material.
4. The method for realizing a downhole heat source for an oil and gas well according to claim 3, wherein the aluminothermic reaction charge comprises an oxidant and aluminum powder in a ratio of 3:1.
5. the method of claim 4, wherein the oxidizing agent is iron powder or iron oxide.
6. A method of realising a downhole heat source for oil and gas wells according to any of claims 1-5 wherein the thermite reaction charge is ignited from above to burn the thermite reaction charge from above.
7. The method of claim 6, wherein the thermite reaction charge comprises a diluent.
8. The method of claim 7, wherein the diluent is calcium oxide, aluminum oxide or silicon dioxide.
9. A method of realising a downhole heat source for oil and gas wells according to claim 8, wherein the thermite reaction charge is diluted by the diluent by an amount between 5% and 75% by mass.
10. A method of realising a downhole heat source for oil and gas wells according to claim 8, wherein the thermite reaction charge is diluted by the diluent by an amount between 10% and 50% by mass.
11. The method of claim 10, wherein the reaction rate of the diluted thermite reaction charge is reduced to 0.5-1 cm/sec.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111290646.4A CN116066016A (en) | 2021-11-02 | 2021-11-02 | Realization method for underground heat source of oil and gas well |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111290646.4A CN116066016A (en) | 2021-11-02 | 2021-11-02 | Realization method for underground heat source of oil and gas well |
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| Publication Number | Publication Date |
|---|---|
| CN116066016A true CN116066016A (en) | 2023-05-05 |
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| CN202111290646.4A Pending CN116066016A (en) | 2021-11-02 | 2021-11-02 | Realization method for underground heat source of oil and gas well |
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| Country | Link |
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