CN114605983A - High-efficiency heat generation chemical agent and using method and application thereof - Google Patents
High-efficiency heat generation chemical agent and using method and application thereof Download PDFInfo
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- CN114605983A CN114605983A CN202210278780.0A CN202210278780A CN114605983A CN 114605983 A CN114605983 A CN 114605983A CN 202210278780 A CN202210278780 A CN 202210278780A CN 114605983 A CN114605983 A CN 114605983A
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/592—Compositions used in combination with generated heat, e.g. by steam injection
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- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
Abstract
The invention belongs to the technical field of oil development and exploitation, and particularly relates to a high-efficiency heat generation chemical agent, and a use method and application thereof. The invention provides a high-efficiency heat generation chemical agent, which comprises the following components in percentage by weight: 1.5 to 4.5 percent of carbazide, 3.5 to 8.5 percent of sodium hypoiodite, 3.5 to 6.5 percent of pH regulator and the balance of water. The reaction product of the high-efficiency heat generation chemical agent mainly comprises components such as carbon dioxide, nitrogen and the like, on one hand, water in a protogen system can be heated, so that the water and the gas carry heat to diffuse, and the effect of expanding heat waves and volume is realized; on the other hand, the oil displacement agent can be used as a displacement medium to sweep oil in the porous medium, thereby further improving the recovery rate of crude oil.
Description
Technical Field
The invention belongs to the technical field of oil development and exploitation, and particularly relates to a high-efficiency heat generation chemical agent, and a use method and application thereof.
Background
China has wide distribution of thick oil resources, however, the thick oil colloid has high asphaltene, high viscosity, poor fluidity and difficult production. Because the thick oil is sensitive to temperature, the viscosity of the crude oil is obviously reduced and the fluidity of the crude oil is obviously increased along with the increase of the temperature, the thermal recovery technology is the main technology for thick oil recovery. The thermal recovery technology mainly used at present comprises the processes of thermal throughput, thermal displacement, thermal fluid assisted gravity displacement and the like. The technology has obvious effect on shallow and middle-deep thick oil fields, and for deep thick oil reservoirs, along with the increase of steam injection temperature, dryness and well depth, the steam injection heat loss of a ground heat generator along the way is inevitably increased, the utilization rate of heat energy is reduced, and the expected yield increasing effect cannot be realized. For the offshore oil field, the problems of shaft flowing, demulsification and dehydration, offshore pipe conveying and the like are more prominent due to the limitation of the platform area, and meanwhile, the offshore oil field adopts the conventional thermal recovery technology, so that the cost is high, and economic and efficient recovery cannot be realized.
The viscosity reduction of the thick oil mainly comprises viscosity reduction technologies such as heating, dilution, emulsification and modification. The viscosity reduction of the thick oil by heating faces some problems, and the key point is that the establishment and maintenance of an underground temperature field need to be matched with corresponding heat generation equipment. The conventional ground steam boiler or ground heat generator has large heat loss of a shaft for a deep heavy oil reservoir and an offshore heavy oil field, and the requirements on the material of a shaft pipe column and a tool are correspondingly improved due to the increase of the temperature, so that the exploitation cost is greatly increased, and economic and efficient exploitation cannot be realized; the adoption of underground heat generating equipment is currently limited by the pressure generated by hot fluid and is not suitable for high-pressure oil reservoirs.
In order to solve the problem of raising the temperature of the heated oil reservoir, oilfield technologists have developed methods, for example, steam injection and simultaneous addition of a thermogenic chemical agent can raise the temperature of the target oil reservoir to a certain extent, but the chemical agent and reaction products are either dangerous chemicals or are prone to corroding the pipe string. The conventional chemical agents for generating heat in the well are mainly redox chemical substances, such as ammonium chloride, sodium nitrite, hydrogen peroxide, urea, sodium nitrite and the like, and can generate heat and generate gas through mixing under certain conditions (acid addition, temperature rise and the like) in the well.
Therefore, a high-efficiency chemical heat generation process needs to be developed to provide scientific basis for heating and viscosity reduction of deep thick oil and offshore thick oil.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a high-efficiency heat generation chemical agent and a using method and application thereof.
In a first aspect, the present invention provides a high-efficiency thermogenic chemical agent, comprising, by weight: 1.5 to 4.5 percent of carbazide, 3.5 to 8.5 percent of sodium hypoiodite, 3.5 to 6.5 percent of pH regulator and the balance of water.
The high-efficiency heat generation chemical agent comprises the following components in percentage by weight: 2-4% of carbazide, 4-8% of sodium hypoiodate, 4-6% of pH regulator and the balance of water.
In a second aspect, the invention provides methods of using the above-described high-efficiency heat-generating chemical agents in a huff-and-puff downhole heat generation process or a displacement downhole heat generation process.
The method for using the high-efficiency heat generation chemical agent adopts the separate horizontal well production well, and is carried out by the following working procedures in multiple rounds of circulation, and comprises the following steps: injecting a high-efficiency thermogenic chemical agent slug, injecting a spacer fluid slug, injecting a displacement fluid slug, stewing and opening a well for production.
In the method for using the high-efficiency thermogenic chemical agent, the high-efficiency thermogenic chemical agent slug also comprises a modifier and an inhibitor in the circulation to the second round and the subsequent rounds.
In the method for using the high-efficiency heat generation chemical agent, in the huff-and-puff downhole heat generation process, the chemical agent injection amount calculation method comprises the following steps:
1) calculating the radius of the heating zone by using a Marx-Langenheim method;
2) controlling downhole heat generation to enable the temperature of an oil layer in an action area to be 300-400 ℃;
3) calculating the total amount of the heat generating chemical agent, the total amount of the spacer fluid, the total amount of the inhibitor and the total injection amount of the chemical agent according to the following formula;
Qtotal injection amount＝QThermogenic chemical agents+QSpacer fluid+QInhibitors
QInhibitors＝δQThermogenic chemical
In the formula: qTotal injection amountTotal injection of chemical agent, m3；QThermogenic chemicalTotal amount of thermogenic chemical agent, m3；QSpacer fluidTotal amount of spacer fluid, m3；QInhibitorsTotal amount of inhibitor, m3(ii) a n-throughput round, 1,2,3 … n; rn-heating radius of the nth round throughput, m; rn-1-heating radius of the n-1 th round throughput, m; l is the length of the horizontal section or the length of the vertical shaft section, m;
-reservoir porosity,%; delta-inhibitor concentration,%.
The method of using the high efficiency heat generating chemical agent described above, the displacement downhole heat generating process is a steam displacement like displacement process or a SAGD like displacement process.
In the method for using the high-efficiency heat-generating chemical agent, in the displacement process similar to the steam flooding, the number of the injection wells is 1, the number of the production wells is more than 1, and the well pattern can adopt a row pattern, a five-point injection-production well pattern or a nine-point reverse injection-production well pattern.
In the SAGD-like displacement process, an injection well and a production well are arranged in pairs inside the oil reservoir.
In a third aspect, the invention also provides the application of the high-efficiency thermogenesis chemical agent in heavy oil reservoirs.
The technical scheme of the invention has the following beneficial effects:
(1) the high-efficiency heat generation chemical agent of the invention releases heat after the oil reservoir reaction, the viscosity of the heated crude oil is obviously reduced, and the fluidity is obviously enhanced;
(2) the reaction product of the high-efficiency heat generation chemical agent mainly comprises components such as carbon dioxide, nitrogen and the like, on one hand, water in a protogen system can be heated, so that the water and the gas carry heat to diffuse, and the effect of expanding heat waves and volume is realized; on the other hand, the oil displacement agent can be used as a displacement medium to displace oil in the porous medium, so that the crude oil recovery rate is further improved;
(3) the invention adopts the high-efficiency chemical heat generation technology to replace the traditional ground heat injection technology, has multiple advantages of reducing heat loss and improving the mining effect, and can realize the function of high-temperature modification locally.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 is a schematic representation of the functioning of a through-put downhole heat generation process;
FIG. 2 is a schematic view of the action of a displacement downhole heat generation process.
Description of the symbols: 1. 11 is a cover layer; 2. 12 is a reservoir; 3. 13 is a multi-channel coiled tubing; 4. 14 is a reaction zone; 5. 15 is a heat release zone; 6. 16 is a heat diffusion region; 7. 17 is the heat diffusion front; and 18 is a production well.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. The following noun terms have meanings commonly understood by those skilled in the art unless otherwise specified.
The terms "the," "said," "an," and "an" as used herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item. The terms "preferred", "more preferred", and the like, refer to embodiments of the invention that may provide certain benefits under certain circumstances. However, other embodiments may be preferred, under the same or other circumstances. Furthermore, the recitation of one or more embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.
When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range-describing features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to encompass any and all subranges subsumed therein.
Specifically, in one aspect, the invention provides a high-efficiency thermogenic chemical agent, which comprises the following components in percentage by weight: 1.5-4.5% of carbazide, 3.5-8.5% of sodium hypoiodite, 3.5-6.5% of pH regulator and the balance of water; preferably, the method comprises the following steps: 2-4% of carbazide, 4-8% of sodium hypoiodate, 4-6% of pH regulator and the balance of water.
When the content of the carbohydrazide is less than 1.5%, the heat generated by the reaction is small, and the oil reservoir cannot be effectively heated; when the content of carbazide is more than 4.5%, the reaction is strongly exothermic, and a large amount of gas is generated in a short time, so that there is a risk of bottom hole pressure increase. When the content of sodium hypoiodate is less than 3.5%, less reactants participate, and the generated heat of the reaction is less; when the content of sodium hypoiodate is more than 8.5%, more reactants are involved, and the reaction has violent heat release.
The principle of the high-efficiency heat generation is as follows: the carbohydrazine reacts with the sodium hypoiodite to generate nitrogen, carbon dioxide and water, and releases heat, and the reaction heat release is about 1500-2000kJ/mol by taking the molar ratio of 1:4 as an example.
Wherein the pH regulator is sodium bicarbonate, etc. The pH regulator is used for regulating the reaction to be neutral or alkaline environment, and promoting the reaction to be carried out, so that the reaction is carried out more fully.
The high-efficiency heat generation chemical agent can also comprise other high-energy liquid explosive substances, aerospace liquid fuels and the like.
Preferably, the liquid explosive species include, but are not limited to, hydrogen peroxide explosives and the like; the aerospace liquid fuel substances include, but are not limited to, hydrazine, dimethylhydrazine, and the like.
After the oil deposit reacts, the temperature of an oil layer exceeds 300 ℃ and the highest temperature is less than 400 ℃, otherwise coking can be generated to influence subsequent exploitation.
The viscosity of the heated crude oil is obviously reduced after the oil reservoir reacts, and the fluidity of the heated crude oil is obviously enhanced.
The main products of the chemical reaction of the high-efficiency heat-generating chemical agent are components such as carbon dioxide, nitrogen and the like, on one hand, water in a protogen system can be heated, so that the water and the gas carry heat to diffuse, and the effect of expanding heat waves and volume is realized; on the other hand, the oil displacement agent can be used as a displacement medium to sweep oil in the porous medium, thereby further improving the recovery rate of crude oil.
In another aspect, the invention also provides methods of using the above-described high-efficiency heat-generating chemical agents in a huff-and-puff downhole heat generation process or a displacement downhole heat generation process.
The high-efficiency heat-generating chemical agent adopts a multi-channel continuous oil pipe in an injection mode, heat-generating substances are respectively injected into a well bottom through different fluid channels, and mixing reaction is carried out at the well bottom.
Specifically, high-efficiency chemical heat generating agent and pH regulator solution are prepared on the ground or on a platform in advance, and the solutions are respectively injected through three channels of a multi-channel continuous oil pipe.
As shown in figure 1, a high-efficiency heat generation chemical agent is injected into a multi-channel continuous oil pipe 3, penetrates through a cover layer 1 by virtue of the multi-channel continuous oil pipe 3, enters a reservoir stratum 2, and reaches a bottom reaction zone 4, heat generation substances of the high-efficiency heat generation chemical agent are mixed at the bottom of a well to release heat, and a heat release zone 5, a heat diffusion zone 6 and a heat diffusion front edge 7 are sequentially formed in the reservoir stratum, so that thick oil of the reservoir stratum is heated.
Preferably, the huff-and-puff downhole thermogenesis process adopts a single horizontal well production well and is performed in multiple cycles according to the following procedures, and comprises the following steps: injecting a high-efficiency thermogenic chemical agent slug, injecting a spacer fluid slug, injecting a displacement fluid slug, stewing and opening a well for production.
Preferably, when a through-put downhole thermogenic process is employed, the high-efficiency thermogenic chemical slug further comprises a modifier and an inhibitor in cycles to the second and subsequent rounds.
Wherein the modifier is a metal ion catalyst used in oil fields, such as Zn, Cu, Mn, Ni, Fe and the like. When the underground reaction reaches the thickened oil upgrading condition, the underground reaction can play a role in upgrading the well.
Wherein the inhibitor is inorganic acid or organic acid commonly used in oil fields, and can be purchased from commercial sources. The addition of the inhibitor allows the reaction time of downhole heat generation to be controlled to delay the reaction of the heat generating agent in the designed zone.
Preferably, in the huff-and-puff downhole heat generation process, the chemical injection amount calculation method comprises the following steps:
1) calculating the radius of the heating zone by using a Marx-Langenheim method;
2) controlling downhole heat generation to enable the temperature of an oil layer in an action area to be 300-400 ℃;
3) calculating the total amount of the heat generating chemical agent, the total amount of the spacer fluid, the total amount of the inhibitor and the total injection amount of the chemical agent according to the following formula;
Qtotal injection amount＝QThermogenic chemical+QSpacer fluid+QInhibitors
QInhibitors＝δQThermogenic chemical agents
In the formula: qTotal injection amount-total injected amount of chemical agent, unit: m is3；QThermogenic chemical-total amount of thermogenic chemicals, in units of: m is3；QSpacer fluidTotal spacer fluid, unit: m is3；QInhibitors-total amount of inhibitor, unit: m is3(ii) a n-throughput round, 1,2,3 … n; r isnHeating radius for the nth round throughput, unit: m; rn-1Heating radius for the n-1 th round throughput, unit: m; l-horizontal section length or vertical well section length, unit: m;
reservoir porosity, unit: %; delta-inhibitor concentration, unit: % of the total weight of the composition.
Further, the method for calculating the delay reaction time of the inhibitor comprises the following steps:
in the formula: t isDelay of timeInhibitor delay response time, unit: day; qSpacer fluidTotal spacer fluid, unit: m is3；VSpacer fluidSpacer injection rate, unit: m is3/d。
Preferably, in the huff-and-puff downhole thermogenesis process, the soaking time is mainly determined by factors such as oil reservoir depth, total injection amount and the like, and the soaking time is formulated by calculating the overall generated heat value and comparing with the heat value scale of the heat injection huff-and-puff process, and is preferably 3-7 days.
The huff-and-puff type downhole efficient chemical heat generation process releases heat energy to the maximum extent by optimizing the use of the spacer fluid and the inhibitor in the injection process, and recovers the thickened oil after being heated and visbroken in the recovery process.
As shown in figure 2, the high-efficiency heat-generating chemical agent is injected into a multi-channel continuous oil pipe 13, penetrates through a cover layer 11 by means of the multi-channel continuous oil pipe 13, enters a reservoir stratum 12, reaches a bottom hole reaction zone 14, the heat-generating substances of the high-efficiency heat-generating chemical agent are mixed and reacted at the bottom hole to release heat, a heat release zone 15, a heat diffusion zone 16 and a heat diffusion front edge 17 are sequentially formed in the reservoir stratum, and finally, heated thick oil is produced through a production well 18.
Wherein the displacement downhole heat generation process is a steam displacement-like displacement process or a SAGD-like displacement process. No matter which displacement process is adopted, the core of the method is that crude oil in a specific area is heated firstly through a downhole efficient chemical heat generation process, and then the crude oil is driven away and is produced from a production well.
Preferably, in the steam flooding-like displacement process, the number of the injection wells is 1, the number of the production wells is more than 1, and the well pattern can adopt a row-shaped, five-point or nine-point injection-production well pattern.
Preferably, in the SAGD-like displacement process, an injection well and a production well are arranged in pairs inside the reservoir.
The displacement type underground efficient chemical heat generation process adopts a double-horizontal well injection-production, five-point method or other injection-production well patterns, adopts a mode similar to ripple advancing, heats crude oil in a near well zone from near to far through optimized use of a spacer fluid and an inhibitor, and then drives the crude oil to a production well; then the oil is externally swept from the near well zone, and the oil after being heated and viscosity reduced is driven to a production well.
The displacement type underground efficient chemical heat generation process adopts a slug type injection mode, namely, after a certain amount of injection, the soaking reaction is carried out for a period of time (preferably 6-12h), and after the underground catalytic heat modification of the crude oil, the crude oil is driven to a production well.
The displacement type underground efficient chemical heat generation process of the invention controls the reaction by gradually inhibiting the reaction and ensuring the heat generating agent entering deep parts among wells to play a role in the earliest injected final reaction,and heating the underground crude oil to reduce viscosity. Adding inhibitor from 1,2,3, … n time periods, 1 st time period, and controlling at TnReacting after a certain time; adding inhibitor in stage 2, controlling at Tn-1Reacting after a certain time; stage 3 addition of inhibitor controlled at Tn-2After the time, the reaction is carried out, and the like.
Preferably, the reaction inhibition time of the nth round is the sum of the reaction inhibition times of the previous n-1 rounds, namely: t isn＝T1+T2+…+Tn-1。
The total amount of the heat-generating chemical agent is optimized according to specific oil reservoir conditions (combining the thickness, the heterogeneity, the viscosity of crude oil, a well pattern, the well spacing and the like of an oil reservoir), the heating efficiency of the oil reservoir is high, and the heat loss is small.
For the displacement type downhole high-efficiency chemical heat generation process, as the injection process is continuously carried out, the total injection amount of the chemical agent is not required to be considered, and the velocity of the injected fluid is mainly considered.
Considering that the distance between oil wells is large and the time required by actual displacement is long, the residual oil between the wells can be calculated, the residual oil is divided into a plurality of equal parts according to the equal proportion division principle, and the displacement is performed in stages according to the length of one equal part.
In another aspect, the invention also provides the application of the high-efficiency thermogenic chemical agent in heavy oil reservoirs.
The heavy oil reservoir is a land heavy oil reservoir or an offshore heavy oil reservoir which needs to be thermally recovered, and compared with a conventional ground heat injection process, the heavy oil reservoir has the advantages of less heat loss and better recovery effect on a deeper heavy oil reservoir.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. Experimental procedures without specifying specific conditions in the following examples were carried out according to conventional methods and conditions. The starting materials used in the following examples are all conventionally commercially available.
Example 1
The heavy oil reservoir burial depth is 2000m, the crude oil viscosity at the reservoir temperature is 5000 mPa.s, the original formation pressure is about 15.0MPa, the oil layer thickness is 20-45m,the permeability is 2-3 μm2The porosity was 33% and the oil saturation was 71%.
Taking a throughput type downhole heat generation process as an example, the implementation of the specific process comprises the following steps:
1) according to the property requirement of the underground heat-generating chemical agent, 2% carbohydrazine, 8% sodium hypoiodite and an inhibitor (10% citric acid solution) are prepared in advance and are respectively loaded and transported to a specified position as required;
2) the underground heat-generating chemical agents are respectively pumped by an injection pump on the ground, and the pumping speed is 600-800m3D, controlled by surface pumping pressure, influenced by formation fluid imbibition capacity;
3) three concentric layers of coiled tubing are arranged in an oil pipe of an injection well, the coiled tubing is provided with 3 channels for independently injecting fluids, three downhole heat-generating substances are respectively injected into a well bottom through different fluid channels, and a mixing reaction is carried out at the well bottom;
4) pump injection 100m 34% sodium bicarbonate, then 200m3Spacer fluid (water);
5) carrying out soaking operation for 2 days;
6) and (5) open-flow blasting is carried out on the well, and the well is opened for production.
7) And (4) handling 3-5 times according to the condition of formation pressure reduction, and finishing the handling after the formation pressure is 70% lower than the initial formation pressure.
8) After the second round of huffing and puff, a modifier is added according to the condition of the temperature field, so that the underground thickened oil is modified.
The heat generation quantity in the through-put type well implemented according to the process is equivalent to 2000t of steam (bottom hole dryness is 50%) injected in each round, and N generated by the reaction2And CO2The greenhouse gases can be directly injected into the stratum, so that the viscosity of crude oil is reduced, the energy of the stratum is improved, and the emission of the greenhouse gases is reduced.
Example 2
The depth of a thick oil reservoir is 2000m, the viscosity of crude oil at the reservoir temperature is 5000 mPa.s, the original formation pressure is about 15.0MPa, the thickness of the oil layer is 20-30m, and the permeability is 2-3 mu m2The porosity is 33%, the oil saturation is 71%, and the interval between production wells of the first injection and the fourth injection well is 40 m.
Taking a displacement type downhole heat generation process as an example, the implementation of the specific process comprises the following steps:
1) according to the property requirement of the underground heat-generating chemical agent, 2% carbohydrazine, 8% sodium hypoiodite and an inhibitor (10% citric acid solution) are prepared in advance and are respectively loaded and transported to a specified position as required;
2) the underground biochemical chemicals are respectively pumped by an injection pump on the ground, and the injection speed is controlled to be 800m by the injection pressure of the pump on the ground3/d；
3) Three concentric layers of coiled tubing are arranged in an oil tube of an injection well, the coiled tubing is provided with 3 channels for independently injecting fluids, three downhole heat-generating substances are respectively injected into a well bottom through different fluid channels, mixing reaction is carried out at the well bottom, and 4% of sodium bicarbonate is added at proper time for reaction;
4) and observing the crude oil production condition in the production well.
Displacement type downhole heat generation heat release and steam injection 300m implemented according to the process3D is equivalent in effect and N is generated by reaction2And CO2The greenhouse gases can be directly injected into the stratum, so that the viscosity of the crude oil is reduced, the energy of the stratum is improved, and the emission of the greenhouse gases is reduced.
The present invention has been disclosed in the foregoing in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions that are equivalent to these embodiments are deemed to be within the scope of the claims of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined in the claims.
Claims (10)
1. A high efficiency thermogenic chemical agent, comprising, in weight percent: 1.5 to 4.5 percent of carbazide, 3.5 to 8.5 percent of sodium hypoiodite, 3.5 to 6.5 percent of pH regulator and the balance of water.
2. A high efficiency thermogenic chemical agent as claimed in claim 1, comprising in weight percent: 2-4% of carbazide, 4-8% of sodium hypoiodate, 4-6% of pH regulator and the balance of water.
3. Use of a high efficiency thermogenic chemical according to any of claims 1-2, characterized in that the thermogenic chemical is applied in a huff-and-puff downhole thermogenic process or a displacement downhole thermogenic process.
4. The method of using a high efficiency thermogenic chemical of claim 3 wherein said huff-and-puff downhole thermogenesis process employs a single horizontal well production well and is performed in multiple cycles comprising: injecting a high-efficiency thermogenic chemical agent slug, injecting a spacer fluid slug, injecting a displacement fluid slug, stewing and opening a well for production.
5. The method of using a high efficiency thermogenic chemical of claim 4, wherein said high efficiency thermogenic chemical slug further comprises modifiers and inhibitors in cycles to second and subsequent rounds.
6. The use method of a high-efficiency heat generating chemical agent according to claim 5, wherein in the through-put downhole heat generating process, the chemical agent injection amount calculation method is as follows:
1) calculating the radius of the heating zone by using a Marx-Langenheim method;
2) controlling downhole heat generation to enable the temperature of an oil layer in an action area to be 300-400 ℃;
3) calculating the total amount of the heat generating chemical agent, the total amount of the spacer fluid, the total amount of the inhibitor and the total injection amount of the chemical agent according to the following formula;
Qtotal injection amount＝QThermogenic chemical+QSpacer fluid+QInhibitors
QInhibitors＝δQThermogenic chemical
In the formula: qTotal injection amountTotal injection of chemical agent, m3；QThermogenic chemicalTotal amount of thermogenic chemical agent, m3；QSpacer fluidTotal amount of spacer fluid, m3；QInhibitorsTotal amount of inhibitor, m3(ii) a n-round of throughput, 1,2,3 … n; rn-heating radius of the nth round throughput, m; rn-1-heating radius of the n-1 th round throughput, m; l is the length of the horizontal section or the length of the vertical shaft section, m;
-reservoir porosity,%; delta-inhibitor concentration,%.
7. The method of using a high efficiency heat generating chemical as claimed in claim 3 wherein the displacement downhole heat generating process is a steam displacement like displacement process or a SAGD like displacement process.
8. The method of using a high efficiency thermogenic chemical according to claim 7 wherein the steam flooding-like displacement process has a number of injection wells of 1 and a number of production wells > 1, and the pattern may be in the form of a row, five-point or nine-point injection-production pattern.
9. The method of using a high efficiency thermogenic chemical according to claim 7 wherein the SAGD-like displacement process has one injection well and one production well arranged in pairs inside the reservoir.
10. Use of the high efficiency thermogenic chemical of any of claims 1-9 in heavy oil reservoirs.
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| US20140090839A1 (en) * | 2012-05-29 | 2014-04-03 | Saudi Arabian Oil Company | Enhanced oil recovery by in-situ steam generation |
| CN103912250A (en) * | 2012-12-31 | 2014-07-09 | 天津大港油田圣达科技有限公司 | Novel crude oil recovery rate improving technology by adopting potential gas drive |
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| 朱炜: "新型卡巴肼衍生物的绿色合成方法研究" * |
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