CN114658404A - Thick oil thermal recovery steam injection device and method - Google Patents
Thick oil thermal recovery steam injection device and method Download PDFInfo
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- CN114658404A CN114658404A CN202210481971.7A CN202210481971A CN114658404A CN 114658404 A CN114658404 A CN 114658404A CN 202210481971 A CN202210481971 A CN 202210481971A CN 114658404 A CN114658404 A CN 114658404A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- 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
- E21B43/243—Combustion in situ
Abstract
The invention discloses a thick oil thermal recovery steam injection device and a method, wherein the thick oil thermal recovery steam injection device comprises a first plugging piece, a second plugging piece and a steam generation mechanism; the steam generating mechanism comprises a shell, a plurality of partition plates, a water injection pipe, a plurality of water valves, an air injection pipe, a plurality of air valves, a gas injection pipe, a plurality of gas valves, a steam pipe and an ignition piece. The invention has the following beneficial effects: the steam generating mechanism is arranged in the shaft, steam generated by the steam generating mechanism is injected between the first blocking piece and the second blocking piece and then enters the target interval, and the steam generated by the steam generating mechanism can be directly injected into the target interval without long-distance transportation, so that the loss of heat in the transportation process can be reduced, the damage of the shaft due to cold and hot alternation can be avoided, meanwhile, the shaft does not need to be made of special materials, and the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of thickened oil thermal recovery, in particular to a thickened oil thermal recovery steam injection device and method.
Background
The thickened oil is crude oil with high content of asphaltene and colloid and high viscosity. The heavy oil resources in the world are extremely rich, and the heavy oil, the super heavy oil, the oil sand and the asphalt account for about 70 percent of the total amount of the global petroleum resources. The global heavy oil geological reserve is about 8150 hundred million tons. At present, more than 70 heavy oil fields are found in 12 basins in China, and the reserve capacity is detected to be 40 hundred million tons. The most abundant is the Liaohe field, followed in turn by the Shengli field, the Clamayi field and the Henan field. The offshore thick oil is intensively distributed in the Bohai sea area, the geological reserve of crude oil is proved to be 45 billion cubic meters by the Bohai sea, and 62 percent of the crude oil is the thick oil.
The thick oil has high viscosity and poor fluidity, and brings great difficulty to the whole development and refining process. In the exploitation stage, the mobility is poor, and the heavy oil generally cannot be sprayed by itself. For crude oil transportation, high-viscosity heavy oil transportation must be carried out by high-power pumping equipment with stable performance. In the refining process, in order to convert the thick oil into fuel oil, a large amount of hydrogen is required to be added for cracking reaction; residual oil, sulfur, nitrogen, metal elements and the like can also greatly increase the difficulty of the refining process.
The research finds that the viscosity of the thick oil is very sensitive to the temperature, and the viscosity is reduced by half when the temperature is increased by 10 ℃. Therefore, experts propose a method for manually heating oil layers, which also becomes a main idea for developing thick oil in later industries. The steam huff and puff method is one of the methods, the oil deposit is heated by injecting high-temperature steam into a shaft, the fluidity of the heavy oil is improved, and the method specifically comprises the following steps: injecting steam generated by a steam generator on the ground into an oil layer through a shaft; soaking the well for 2-5 days; and thirdly, well opening production. The steam injection amount and the soaking time are determined according to factors such as well depth, reservoir properties, viscosity and the like.
Because high-temperature and high-pressure steam (the temperature is as high as 350 ℃ and the pressure is as high as 17 MPa) needs to be injected, special materials, equipment and processes need to be adopted for steam throughput, and large casings (generally more than 7 inches, and the wall thickness of the casings is generally more than 9 millimeters) are commonly used for production wells. At present, 80% of heavy oil thermal recovery yield in China is obtained by a steam huff and puff process. When the steam huff-and-puff test is carried out on the oil wells in the three high areas of the Liaohe oil field for the first time, 980 tons of steam are cumulatively injected, 58 days of self-blowing and 780 tons of oil production are carried out.
The disadvantages of steam huff and puff are; the cold and hot periodic variation of steam is great to the harm of pit shaft, simultaneously, because compare with foreign viscous crude oil field, the viscous crude buried of china is dark (concentrate on 1000 ~ 1500 meters), consequently, the steam that subaerial steam generator produced need carry the back through long distance pit shaft, just can reach target gas injection interval, at this in-process, can consume a large amount of heat energy, simultaneously, whole pit shaft all need adopt the pit shaft that special material made, and manufacturing cost is higher.
Disclosure of Invention
In view of the above, there is a need to provide a thick oil thermal recovery steam injection device and method, so as to solve the technical problems that the steam generated by a steam generator on the ground needs to be transported through a long-distance shaft to reach a target gas injection interval in the existing steam stimulation process, which results in a large amount of heat loss, easy damage to the shaft, and high production cost.
In order to achieve the aim, the invention provides a thick oil thermal recovery steam injection device, which comprises a first plugging piece, a second plugging piece and a steam generation mechanism, wherein the first plugging piece is connected with the second plugging piece;
the first plugging piece is used for plugging in a shaft;
the second plugging piece is used for plugging in the shaft and is positioned above the first plugging piece, and an air inlet is formed in the second plugging piece;
the steam generating mechanism comprises a shell, a plurality of partition plates, a water injection pipe, a plurality of water valves, an air injection pipe, a plurality of air valves, an air injection pipe, a plurality of gas valves, a steam pipe and an ignition piece, wherein the shell is provided with a cylindrical accommodating cavity, each partition plate is arranged in the accommodating cavity along the length direction of the shell so as to divide the accommodating cavity into a plurality of evaporation cavities and combustion cavities which are sequentially arranged at intervals along the length direction, the water injection pipe is used for being communicated with a water source, a plurality of water injection ports are formed in the water injection pipe, the water injection ports are arranged in the evaporation cavities in a one-to-one correspondence manner, the water valves are arranged on the water injection ports in a one-to-one correspondence manner, the air injection pipe is used for being communicated with an outlet of an air compressor, a plurality of air inlet ports are formed in the air injection pipe, and the air inlet ports are arranged in the combustion cavities in a one-to-one correspondence manner, the air valves are arranged on the air inlet ports in a one-to-one correspondence mode, the gas injection pipes are used for being communicated with a gas source, a plurality of gas inlet ports are formed in the gas injection pipes, the gas inlet ports are arranged in the combustion chambers in a one-to-one correspondence mode, the gas valves are arranged on the gas inlet ports in a one-to-one correspondence mode, one end of each steam pipe is communicated with the evaporation chambers, the other end of each steam pipe is used for being communicated with the gas inlet ports, the number of the ignition pieces is the same as the number of the combustion chambers, the ignition pieces are in one-to-one correspondence mode, and the ignition pieces are arranged in the corresponding combustion chambers.
In some embodiments, the first blocking element includes a first blocking block, a first air bag, and a first air pump, the first blocking block is configured to be disposed in the wellbore, a first installation groove is formed on a sidewall of the first blocking block, the first air bag is disposed in the first installation groove, and the first air pump is in communication with the first air bag.
In some embodiments, a steam cavity is further formed at the lower end of the casing, a steam outlet joint communicated with the steam cavity is formed on the lower end surface of the casing, one end of each steam pipe is communicated with each evaporation cavity, the other end of each steam pipe is communicated with the steam cavity, and the steam outlet joint is used for being communicated with the air inlet.
In some embodiments, the second blocking element includes a second blocking block, a second air bag, and a second air pump, the second blocking block is configured to be disposed in the wellbore, the air inlet is opened on the second blocking block, a second mounting groove is opened on a side wall of the second blocking block, the second air bag is disposed in the second mounting groove, and the second air pump is in communication with the second air bag.
In some embodiments, the second blocking piece further includes an air inlet joint and an in-place detection piece, the air inlet joint is fixed at the air inlet end of the air inlet and is matched with the steam outlet joint, the in-place detection piece includes a first polar plate, a second polar plate, an elastic piece and an alarm piece, the first polar plate is fixed on the second blocking piece, the second polar plate is located above the first polar plate, one end of the elastic piece is fixedly connected with the first polar plate, the other end of the elastic piece is fixedly connected with the second polar plate, the alarm piece is electrically connected with both the first polar plate and the second polar plate, and when the first polar plate is abutted against the second polar plate, the alarm piece sends out an alarm signal.
In some embodiments, the second closure further comprises an air outlet connector secured to an air outlet end of the air inlet.
In some embodiments, a liquid level detection member is disposed in each evaporation cavity.
The invention also provides a thickened oil thermal recovery gas injection method, which is suitable for the thickened oil thermal recovery gas injection device and comprises the following steps:
s1, perforating the target interval needing thick oil recovery;
s2, putting the first plugging piece into the shaft, and plugging the first plugging piece below the target interval;
s3, putting the second plugging piece into the shaft, and plugging the second plugging piece above the target interval;
s4, putting the steam generating mechanism into the shaft, communicating a steam pipe of the steam generating mechanism with an air inlet of a second plugging piece, communicating the upper end of a water injection pipe with a water source on the ground, communicating the upper end of a gas injection pipe with a gas source on the ground, and communicating the upper end of a gas injection pipe with an outlet of an air compressor on the ground;
and S5, opening the water valves, the air valves and the gas valves to enable water to enter the evaporation cavities through the water injection pipes, enabling gas and air to enter the combustion cavities, and simultaneously igniting through the ignition pieces to enable the gas in the combustion cavities to be combusted, wherein the heat generated by combustion can heat the water in the adjacent evaporation cavities to enable the water to be evaporated, and steam generated in the evaporation cavities enters the shaft between the first blocking piece and the second blocking piece through the steam pipes and the air inlets and then is injected into the target interval.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) the steam generating mechanism is arranged in the shaft, and steam generated by the steam generating mechanism is injected into the shaft section between the first blocking piece and the second blocking piece and then enters the target interval;
(2) according to the invention, the plurality of evaporation chambers and the plurality of combustion chambers are sequentially arranged in the cylindrical shell at intervals along the length direction, so that the evaporation chambers and the combustion chambers are arranged in a staggered manner, and heat exchange between the evaporation chambers and the combustion chambers is facilitated, therefore, on one hand, the utilization efficiency of heat generated by combustion in the combustion chambers can be improved, and meanwhile, the defects that the conventional steam generator is large in size and cannot be put into a shaft are overcome by the arrangement mode of the plurality of evaporation chambers and the plurality of combustion chambers.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a heavy oil thermal recovery steam injection device provided by the present invention;
FIG. 2 is a schematic cross-sectional view of the steam generating mechanism of FIG. 1;
FIG. 3 is a schematic structural view of the steam generating mechanism of FIG. 2;
fig. 4 is a schematic perspective view of the first closure of fig. 1;
fig. 5 is a schematic structural view of the first closure of fig. 4;
fig. 6 is a schematic perspective view of the second closure of fig. 1;
FIG. 7 is a schematic illustration of the second closure of FIG. 6;
in the figure: 1-first plugging piece, 11-first plugging block, 111-first mounting groove, 12-first air bag, 13-first air pump, 2-second plugging piece, 21-second plugging block, 211-air inlet, 212-second mounting groove, 213-air outlet joint, 22-second air bag, 23-second air pump, 24-air inlet joint, 25-in-place detection piece, 251-first polar plate, 252-second polar plate, 253-elastic piece, 3-steam generating mechanism, 31-shell, 311-evaporation cavity, 312-combustion cavity, 313-steam cavity, 314-steam outlet joint, 32-partition plate, 33-water injection pipe, 331-water valve, 34-air injection pipe, 341-air valve, 35-gas injection pipe, 351-gas valve, 36-steam tube, 361-opening, 37-ignition element, 4-wellbore, S1-first interval, S2-second interval, S3-third interval, S4-target interval, S5-fifth interval.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
Referring to fig. 1 to 7, the present invention provides a thick oil thermal recovery steam injection device and a thick oil thermal recovery method, including a first plugging member 1, a second plugging member 2 and a steam generation mechanism 3.
The first closure 1 is intended to be plugged into a wellbore 4. The second plugging piece 2 is used for being plugged in the shaft 4 and positioned above the first plugging piece 1, and the second plugging piece 2 is provided with an air inlet 211.
The steam generating mechanism 3 comprises a shell 31, a plurality of clapboards 32, a water injection pipe 33, a plurality of water valves 331, an air injection pipe 34, a plurality of air valves 341, a gas injection pipe 35, a plurality of gas valves 351, a steam pipe 36 and an ignition piece 37, the housing 31 has a cylindrical receiving cavity, the housing 31 is made of a heat insulating material, each of the partitions 32 is disposed in the receiving cavity along a length direction of the housing 31, in order to incite somebody to action the chamber is separated into a plurality of evaporation chamber 311 and the burning chamber 312 of interval arrangement in proper order along length direction (from last to down, arrange in proper order according to evaporation chamber 311, burning chamber 312, evaporation chamber 311, burning chamber 312 … … promptly to make evaporation chamber 311 and burning chamber 312 stagger each other and arrange, so that evaporation chamber 311 and the heat transfer in burning chamber 312, baffle 32 adopts the good material of heat conductivity to make, thereby be convenient for evaporation chamber 311 and adjacent burning chamber 312 heat transfer.
The water injection pipe 33 is configured to communicate with a water source (a pressurized water source, such as a tap water pipe), the water injection pipe 33 is provided with a plurality of water injection ports, the water injection ports are correspondingly arranged in the evaporation cavities 311 one by one, the water valves 331 are correspondingly arranged on the water injection ports one by one, the air injection pipe 34 is configured to communicate with an outlet of an air compressor (not shown), the air injection pipe 34 is provided with a plurality of air inlet ports, the air inlet ports are correspondingly arranged in the combustion cavities 312 one by one, the air valves 341 are correspondingly arranged on the air inlet ports one by one, the gas injection pipe 35 is configured to communicate with a gas source (such as a natural gas pipeline), the gas injection pipe 35 is provided with a plurality of gas inlet ports, the gas inlet ports are correspondingly arranged in the combustion cavities 312 one by one, and the gas valves 351 are correspondingly arranged on the gas inlet ports one by one, one end of the steam pipe 36 is communicated with each evaporation cavity 311, the other end of the steam pipe 36 is used for being communicated with the air inlet 211, specifically, the steam pipe 36 is provided with a plurality of openings 361, each opening 361 is in one-to-one correspondence with each evaporation cavity 311, so that steam can enter the steam pipe 36 through the openings 361, the number of the ignition pieces 37 is the same as that of the combustion cavities 312, the ignition pieces 37 are in one-to-one correspondence, and each ignition piece 37 is arranged in the corresponding combustion cavity 312. It should be understood that, in order to facilitate the discharge of the exhaust gas produced by combustion in the combustion chambers 312, the steam generating means 3 further comprises an exhaust pipe (not shown) having a lower end communicating with each of the combustion chambers 312 and an upper end extending to the ground.
When in use, assuming that the stratum sequentially comprises a first interval S1, a second interval S2, a third interval S3, a fourth interval (namely a target interval S4) and a fifth interval S5 from top to bottom, firstly, perforating the target interval S4 needing thick oil recovery, then, putting the first blocking piece 1 into the shaft 4, and blocking the first blocking piece below the target interval S4; lowering the second plug 2 into the wellbore and plugging it above the target interval S4; lowering the steam generating mechanism 3 into the shaft 4, and communicating a steam pipe 36 of the steam generating mechanism 3 with an air inlet 211 of the second plugging member 2, so that the upper end of the water injection pipe 33 is communicated with a water source on the ground, the upper end of the gas injection pipe 35 is communicated with a gas source on the ground, and the upper end of the air injection pipe 34 is communicated with an outlet of an air compressor on the ground; and (3) opening each water valve 331, the air valve 341 and the gas valve 351, enabling water to enter each evaporation cavity 311 through the water injection pipe 33, enabling gas and air to enter each combustion cavity 312, and simultaneously igniting through each ignition piece 37, so that the gas in each combustion cavity 312 is combusted, the water in the adjacent evaporation cavity 311 can be heated by the heat generated by the combustion, the water is converted into steam, the steam generated in each evaporation cavity 311 enters between the first blocking piece and the second blocking piece in the shaft 4 through the steam pipe 36 and the air inlet 211, and then the steam is injected into the target interval S4.
The invention has the following beneficial effects:
(1) the first blocking piece 1 and the second blocking piece 2 are plugged at the upper end and the lower end of a target interval S4 in the shaft 4, the steam generating mechanism 3 is lowered into the shaft 4, steam generated by the steam generating mechanism 3 is injected into a shaft section between the first blocking piece 1 and the second blocking piece 2 and then enters the target interval S4, and the steam generating mechanism 3 is positioned in the shaft 4, so that the generated steam can be directly injected into the target interval S4 without long-distance transportation, the loss of heat in the transportation process can be reduced, the damage of the shaft 4 due to cold and hot alternation can be avoided, meanwhile, the shaft 4 does not need to be made of special materials, and the production cost is reduced;
(2) according to the invention, the plurality of evaporation cavities 311 and the plurality of combustion cavities 312 are sequentially arranged in the cylindrical shell 31 at intervals along the length direction, so that the evaporation cavities 311 and the combustion cavities 312 are arranged in a staggered manner, and heat exchange between the evaporation cavities 311 and the combustion cavities 312 is facilitated, therefore, on one hand, the utilization efficiency of heat generated by combustion in the combustion cavities 312 can be improved, and meanwhile, the defects that the conventional steam generator is large in size and cannot be put into the shaft 4 are overcome by the arrangement mode of the plurality of evaporation cavities 311 and the plurality of combustion cavities 312.
In order to realize the function of the first blocking element 1 specifically, please refer to fig. 1, fig. 4 and fig. 5, in a preferred embodiment, the first blocking element 1 includes a first blocking block 11, a first air bag 12 and a first air pump 13, the first blocking block 11 is configured to be disposed in the wellbore 4, a first installation groove 111 is formed on a side wall of the first blocking block 11, the first air bag 12 is disposed in the first installation groove 111, the first air pump 13 is communicated with the first air bag 12, when in use, the first blocking block 11 is lowered below a target stratum through a drill pipe, and then the first air pump 13 injects air into the first air bag 12, so that the first air bag 12 is expanded and blocked in the wellbore 4.
In order to facilitate the communication between the steam pipe 36 and the air inlet 211, referring to fig. 1-3, in a preferred embodiment, a steam cavity 313 is further formed at the lower end of the casing 31, a steam outlet joint 314 communicated with the steam cavity 313 is formed on the lower end surface of the casing 31, one end of the steam pipe 36 is communicated with each evaporation cavity 311, the other end of the steam pipe 36 is communicated with the steam cavity 313, the steam outlet joint 314 is used for communicating with the air inlet 211, and when in use, the communication between the steam pipe 36 and the air inlet 211 can be achieved only by lowering the casing 31 into the shaft 4 and butting the steam outlet joint 314 with the air inlet 211 on the second block 21.
In order to realize the function of the second plugging member 2 specifically, referring to fig. 1, fig. 6 and fig. 7, in a preferred embodiment, the second plugging member 2 includes a second plugging block 21, a second air bag 22 and a second air pump 23, the second plugging block 21 is configured to be disposed in the wellbore 4, the air inlet 211 is opened on the second plugging block 21, a second mounting groove 212 is formed on a side wall of the second plugging block 21, the second air bag 22 is disposed in the second mounting groove 212, the second air pump 23 is communicated with the second air bag 22, when in use, the second plugging block 21 is lowered to the upper side of the target formation through a drill rod, and then the second air pump 23 injects air into the second air bag 22, so that the second air bag 22 is expanded and plugged in the wellbore 4.
In order to facilitate detecting whether the steam connector 314 is in contact with the air inlet 211, referring to fig. 1, 2, 6 and 7, in a preferred embodiment, the second blocking member 2 further includes an air inlet connector 24 and an in-place detecting member 25, the air inlet connector 24 is fixed to an air inlet end of the air inlet 211 and is matched with the steam outlet connector, the in-place detecting member 25 includes a first pole plate 251, a second pole plate 252, an elastic member 253 and an alarm member (not shown), the first pole plate 251 is fixed to the second blocking block 21, the second pole plate 252 is located above the first pole plate 251, one end of the elastic member 253 is fixedly connected to the first pole plate 251, the other end of the elastic member 253 is fixedly connected to the second pole plate 252, the alarm member is electrically connected to both the first pole plate 251 and the second pole plate 252, when the first pole plate 251 is in contact with the second pole plate 252, the alarm component sends out an alarm signal. When the steam outlet connector 314 enters the air inlet connector 24 during the casing 31 is lowered, the steam outlet connector is abutted with the second pole plate 252, then the second pole plate 252 is pressed to move downwards, and when the first pole plate 251 is abutted with the second pole plate 252, the alarm part gives an alarm signal to indicate that the steam outlet connector 314 enters the air inlet connector 24 and is completely abutted, so that the casing 31 is stopped being lowered.
In order to facilitate the steam discharge, referring to fig. 1, 6 and 7, in a preferred embodiment, the second blocking member 21 further includes an air outlet connector 213, and the air outlet connector 213 is fixed to an air outlet end of the air inlet 211.
In order to prevent the evaporation cavity 311 from being empty or overflowing, referring to fig. 1-3, in a preferred embodiment, a liquid level detection member (not shown) is disposed in each evaporation cavity 311, when the water level in the evaporation cavity 311 from the liquid level detection member is lower than a preset water level, the corresponding water valve 331 is opened, and when the water level in the evaporation cavity 311 from the liquid level detection member is higher than the preset water level, the corresponding water valve 331 is closed, so that the water level in the evaporation cavity 311 can be always kept at the preset water level to prevent the empty or overflowing situation.
The invention also provides a thickened oil thermal recovery gas injection method, which is suitable for the thickened oil thermal recovery gas injection device and comprises the following steps:
s1, perforating the target interval S4 needing thick oil recovery;
s2, the first plugging piece 1 is lowered into the shaft 4 and is plugged below the target interval S4;
s3, the second plugging piece 2 is lowered into the shaft 4 and is plugged above the target interval S4;
s4, lowering the steam generating mechanism 3 into the shaft 4, communicating the steam pipe 36 of the steam generating mechanism 3 with the air inlet 211 of the second plugging piece 2, communicating the upper end of the water injection pipe 33 with a water source on the ground, communicating the upper end of the gas injection pipe 35 with a gas source on the ground, and communicating the upper end of the gas injection pipe 34 with an outlet of an air compressor on the ground;
and S5, opening the water valves 331, the air valve 341 and the gas valve 351, enabling water to enter the evaporation cavities 311 through the water injection pipe 33, enabling gas and air to enter the combustion cavities 312, and simultaneously igniting through the ignition pieces 37, so that the gas in the combustion cavities 312 is combusted, the water in the adjacent evaporation cavities 311 can be heated by the heat generated by the combustion, the water is evaporated, and the steam generated in the evaporation cavities 311 enters the shaft 4 between the first blocking piece 1 and the second blocking piece 2 through the steam pipe 36 and the air inlet 211 and is injected into the target interval S4.
In conclusion, the beneficial effects of the invention are as follows:
(1) the steam generating mechanism 3 is arranged in the shaft 4 through the first plugging piece 1 and the second plugging piece 2 which are plugged at the upper end and the lower end of a target interval S4 in the shaft 4, the steam generated by the steam generating mechanism 3 is injected into the shaft section between the first plugging piece 1 and the second plugging piece 2 and then enters the target interval S4, and the steam generating mechanism 3 is positioned in the shaft 4, so that the generated steam can be directly injected into the target interval S4 without long-distance transportation, thereby reducing the loss of heat in the transportation process, avoiding the damage of the shaft 4 due to cold and heat alternation, simultaneously, the shaft 4 does not need to be made of special materials, and reducing the production cost;
(2) according to the invention, the plurality of evaporation cavities 311 and the plurality of combustion cavities 312 are sequentially arranged in the cylindrical shell 31 at intervals along the length direction, so that the evaporation cavities 311 and the combustion cavities 312 are arranged in a staggered manner, and heat exchange between the evaporation cavities 311 and the combustion cavities 312 is facilitated, therefore, on one hand, the utilization efficiency of heat generated by combustion in the combustion cavities 312 can be improved, and meanwhile, the defects that the conventional steam generator is large in size and cannot be put into the shaft 4 are overcome by the arrangement mode of the plurality of evaporation cavities 311 and the plurality of combustion cavities 312;
(3) through set up the detection piece 25 that targets in place on second shutoff piece 21, whether detectable steam connects 314 and air inlet 211 dock in place to can be convenient for go into steam generation mechanism 3, improved the convenient to use degree of thick oil thermal recovery steam injection device greatly.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (8)
1. A thick oil thermal recovery steam injection device is characterized by comprising a first plugging piece, a second plugging piece and a steam generation mechanism;
the first plugging piece is used for plugging in a shaft;
the second plugging piece is used for plugging in the shaft and is positioned above the first plugging piece, and an air inlet is formed in the second plugging piece;
the steam generating mechanism comprises a shell, a plurality of partition plates, a water injection pipe, a plurality of water valves, an air injection pipe, a plurality of air valves, an air injection pipe, a plurality of gas valves, a steam pipe and an ignition piece, wherein the shell is provided with a cylindrical accommodating cavity, each partition plate is arranged in the accommodating cavity along the length direction of the shell so as to divide the accommodating cavity into a plurality of evaporation cavities and combustion cavities which are sequentially arranged at intervals along the length direction, the water injection pipe is used for being communicated with a water source, a plurality of water injection ports are formed in the water injection pipe, the water injection ports are arranged in the evaporation cavities in a one-to-one correspondence manner, the water valves are arranged on the water injection ports in a one-to-one correspondence manner, the air injection pipe is used for being communicated with an outlet of an air compressor, a plurality of air inlet ports are formed in the air injection pipe, and the air inlet ports are arranged in the combustion cavities in a one-to-one correspondence manner, the air valves are arranged on the air inlet ports in a one-to-one correspondence mode, the gas injection pipes are used for being communicated with a gas source, a plurality of gas inlet ports are formed in the gas injection pipes, the gas inlet ports are arranged in the combustion chambers in a one-to-one correspondence mode, the gas valves are arranged on the gas inlet ports in a one-to-one correspondence mode, one end of each steam pipe is communicated with the evaporation chambers, the other end of each steam pipe is used for being communicated with the gas inlet ports, the number of the ignition pieces is the same as the number of the combustion chambers, the ignition pieces are in one-to-one correspondence mode, and the ignition pieces are arranged in the corresponding combustion chambers.
2. The thick oil thermal recovery steam injection device according to claim 1, wherein the first blocking piece comprises a first blocking block, a first air bag and a first air pump, the first blocking block is arranged in a shaft, a first mounting groove is formed in a side wall of the first blocking block, the first air bag is arranged in the first mounting groove, and the first air pump is communicated with the first air bag.
3. The thickened oil thermal recovery steam injection device according to claim 1, wherein a steam cavity is further formed at the lower end of the casing, a steam outlet joint communicated with the steam cavity is formed in the lower end face of the casing, one end of the steam pipe is communicated with each evaporation cavity, the other end of the steam pipe is communicated with the steam cavity, and the steam outlet joint is used for being communicated with the air inlet.
4. The thickened oil thermal recovery steam injection device according to claim 1, wherein the second blocking piece comprises a second blocking block, a second air bag and a second air pump, the second blocking block is arranged in the shaft, the air inlet is formed in the second blocking block, a second mounting groove is formed in the side wall of the second blocking block, the second air bag is arranged in the second mounting groove, and the second air pump is communicated with the second air bag.
5. The thick oil thermal recovery steam injection device according to claim 4, wherein the second blocking piece further comprises an air inlet joint and an in-place detection piece, the air inlet joint is fixed at an air inlet end of the air inlet and matched with the steam outlet joint, the in-place detection piece comprises a first polar plate, a second polar plate, an elastic piece and an alarm piece, the first polar plate is fixed on the second blocking piece, the second polar plate is located above the first polar plate, one end of the elastic piece is fixedly connected with the first polar plate, the other end of the elastic piece is fixedly connected with the second polar plate, the alarm piece is electrically connected with both the first polar plate and the second polar plate, and when the first polar plate abuts against the second polar plate, the alarm piece sends out an alarm signal.
6. The thickened oil thermal recovery steam injection device according to claim 4, wherein the second plugging member further comprises an air outlet joint, and the air outlet joint is fixed to an air outlet end of the air inlet.
7. The heavy oil thermal recovery steam injection device according to claim 1, wherein a liquid level detection piece is arranged in each evaporation cavity.
8. A thickened oil thermal recovery gas injection method is suitable for the thickened oil thermal recovery gas injection device according to any one of claims 1 to 7, and is characterized by comprising the following steps:
s1, perforating the target interval needing thick oil recovery;
s2, putting the first plugging piece into the shaft, and plugging the first plugging piece below the target interval;
s3, putting the second plugging piece into the shaft, and plugging the second plugging piece above the target interval;
s4, putting the steam generating mechanism into the shaft, communicating a steam pipe of the steam generating mechanism with an air inlet of a second plugging piece, communicating the upper end of a water injection pipe with a water source on the ground, communicating the upper end of a gas injection pipe with a gas source on the ground, and communicating the upper end of a gas injection pipe with an outlet of an air compressor on the ground;
and S5, opening the water valves, the air valves and the gas valves to enable water to enter the evaporation cavities through the water injection pipes, enabling gas and air to enter the combustion cavities, and simultaneously igniting through the ignition pieces to enable the gas in the combustion cavities to be combusted, wherein the heat generated by combustion can heat the water in the adjacent evaporation cavities to enable the water to be evaporated, and steam generated in the evaporation cavities enters the shaft between the first blocking piece and the second blocking piece through the steam pipes and the air inlets and then is injected into the target interval.
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