CN107795309B - Heavy oil production pipe column and oil production method thereof - Google Patents
Heavy oil production pipe column and oil production method thereof Download PDFInfo
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- CN107795309B CN107795309B CN201711105596.1A CN201711105596A CN107795309B CN 107795309 B CN107795309 B CN 107795309B CN 201711105596 A CN201711105596 A CN 201711105596A CN 107795309 B CN107795309 B CN 107795309B
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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
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
Abstract
The invention discloses a heavy oil production pipe and an oil production method thereof, wherein the heavy oil production pipe comprises: the screen pipe is used for being arranged in the horizontal well section, and screen slots used for communicating an oil layer and a shaft are arranged on the screen pipe; the blind pipe is arranged in the sieve pipe; a plurality of packers disposed in an annulus between the screen and the blind pipe, adjacent packers being spaced apart by a predetermined distance; the temperature monitoring device comprises a plurality of throttles, wherein the throttles are arranged in the blind pipes and located between two adjacent packers, a temperature monitoring part is arranged on each throttles, and when the temperature monitored by the temperature monitoring part reaches a preset temperature, the throttles are closed. The heavy oil production pipe column and the oil production method thereof provided by the invention can realize the control of stable combustion in the fireflood combustion process and prevent the problems of fire line channeling and oxygen breakthrough in the horizontal well fireflood process.
Description
Technical Field
The invention relates to the technical field of oil extraction of heavy oil fields, in particular to a heavy oil extraction pipe column and an oil extraction method thereof.
Background
The main difficulties in the exploitation of heavy oil fields are the high viscosity, high density and low fluidity of crude oil. For heavy oil fields, the development of temperature rise and viscosity reduction is generally carried out by adopting a fireflood technology. The fire flooding technology is an oil extraction method which makes the temperature of an oil layer reach the ignition point of crude oil by means of electric ignition, chemical ignition and the like, and injects air into the oil layer to make the crude oil in the oil layer continuously burn. The method has the advantages of high thermal efficiency, high ultimate recovery rate, energy conservation, emission reduction and the like.
When heavy oil development is carried out by using a fire flooding technology, air needs to be continuously injected into a stratum, an oil layer is ignited, and crude oil is produced through a production well. At present, aiming at the initial cultivation stage of a fire cavity after an oil layer is successfully ignited, stable combustion in a fire flooding process needs to be ensured. However, during current development, high temperature mobile oil production through horizontal wells increases the temperature of the strip in which the horizontal well section is located. When the temperature rises to a certain degree, once air breaks through the plugging of the coking zone and directly enters the horizontal shaft to cause high-temperature combustion, the temperature of the produced liquid of the horizontal shaft and the oxygen content in the produced gas can be increased sharply, and the horizontal shaft can be even burnt in severe cases. Therefore, how to control stable combustion is a key point in the fireflood combustion process.
However, an effective fire flooding oil extraction technology is not available at present, air flow can be controlled better, oil drainage is stable, and combustion is stable. Therefore, a new heavy oil recovery technology is needed to be provided to control stable combustion and prevent the problems of fire line channeling and oxygen breakthrough in the horizontal well fireflood process in the fireflood combustion process.
Disclosure of Invention
The invention aims to provide a heavy oil production pipe column and an oil production method thereof, which can realize the control and stable combustion in the fireflood combustion process and prevent the problems of fire line channeling and oxygen breakthrough in the horizontal well fireflood process.
The above object of the present invention can be achieved by the following technical solutions:
a heavy oil production string, the heavy oil production string comprising:
the screen pipe is used for being arranged in the horizontal well section, and screen slots used for communicating an oil layer and a shaft are arranged on the screen pipe;
the blind pipe is arranged in the screen pipe, is communicated with the restrictor, and fluid entering the blind pipe through the restrictor is produced to the ground along the blind pipe;
a plurality of packers disposed in an annulus between the screen and the blind pipe, adjacent packers being spaced apart by a predetermined distance;
the temperature monitoring device comprises a plurality of throttles, wherein the throttles are arranged in the blind pipes and located between two adjacent packers, a temperature monitoring part is arranged on each throttles, and when the temperature monitored by the temperature monitoring part reaches a preset temperature, the throttles are closed.
In a preferred embodiment, the predetermined distance is a projected distance of the drainage strip in the horizontal well section.
In a preferred embodiment, the predetermined distance is 20 to 30 meters.
In a preferred embodiment, the predetermined temperature is a temperature of high-temperature oxidative combustion of oil.
In a preferred embodiment, the predetermined temperature is 350 degrees celsius or greater.
A heavy oil recovery process, comprising:
the method comprises the following steps of (1) putting a blind pipe in a sieve tube of a horizontal well casing of the production well, putting a plurality of packers between the sieve tube and the blind pipe at intervals of a preset distance, and putting a throttler with a temperature monitoring part between two adjacent packers on the blind pipe to divide the horizontal well casing of the production well into a plurality of sections;
and the temperature monitoring part of the throttler is used for monitoring the temperature in real time, and when the monitored temperature exceeds the preset temperature, the throttler is closed.
In a preferred embodiment, the predetermined distance is a projected distance of the drainage strip in the horizontal well section.
In a preferred embodiment, the predetermined distance is 20 to 30 meters.
In a preferred embodiment, the predetermined temperature is a temperature of high-temperature oxidative combustion of oil.
In a preferred embodiment, the predetermined temperature is 350 degrees celsius or greater.
The invention has the characteristics and advantages that: the application provides an oil production pipe column and oil production method thereof, through adding packer and flow controller on the blind pipe in the production well screen pipe, temperature monitoring portion has on the flow controller in the blind pipe, the packer separates into several sections with the horizontal well section of production well, when the combustion chamber impels horizontal pit shaft, the temperature of temperature monitoring portion on the flow controller of horizontal well barrel section this moment surpasses 350 ℃, the flow controller adjustment of this section is closed, the circulation passageway between horizontal pit shaft blind pipe and the flow controller this moment closes, gas (vapour) liquid fluid does not get into this well barrel section again, avoid live wire and oxygen to scurry into the pit shaft, the combustion zone can not normally impel. The air can overlap along upper portion oil reservoir and reach the burning front edge, forms the stable burning front edge that slopes forward, continues stable burning at the well barrel section that next packer seals off, realizes that the segmentation cutting stabilizes gravity drainage development mode to avoid the air directly to get into horizontal well pit shaft, guarantee that the burning is stabilized to the fireflood front edge, have good security and good economic benefits.
Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
FIG. 1 is a schematic illustration of the vicinity of the combustion front at the early stages of fireflooding;
FIG. 2 is a schematic illustration of a heavy oil production string according to an embodiment of the present disclosure;
FIG. 3 is a cross-sectional view of a heavy oil production string according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a development mode of achieving segmented cutting stable gravity drainage for a heavy oil production string according to an embodiment of the present application;
fig. 5 is a flow chart illustrating the steps of a method for recovering heavy oil in accordance with an embodiment of the present disclosure.
Description of reference numerals:
a gas injection well-1; a production well-2; toe end-21; heel-22; a sieve tube-3; screen slot-30; a blind pipe-4; a packer-5; a restrictor-6; temperature monitoring part-60.
Detailed Description
The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, it should be understood that these embodiments are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and various equivalent modifications of the present invention by those skilled in the art after reading the present invention fall within the scope of the appended claims.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
As shown in fig. 1, for heavy oil production, the well pattern structure includes a gas injection well 1 for gas injection and a production well 2 for oil production. Wherein the production well 2 is a horizontal well having a horizontal well section at the bottom of the oil reservoir. In the early stage of fireflooding, include in proper order between gas injection well 1 to the production well 2: combustion front, coking zone, oil drainage zone, cold oil zone. During development, high temperature mobile oil production through the horizontal well will raise the temperature of the strip in which the horizontal well section is located. When the temperature rises to a certain degree, once air breaks through the plugging of the coking zone and directly enters the horizontal shaft to cause high-temperature combustion, the temperature of the produced liquid of the horizontal shaft and the oxygen content in the produced gas can be increased sharply, and the horizontal shaft can be even burnt in severe cases.
The invention provides a heavy oil production pipe column and an oil production method thereof, which can better control air flow and stabilize oil drainage in the fireflooding combustion process, realize stable combustion control and prevent the problems of fire line channeling and oxygen breakthrough in the fireflooding process of a horizontal well.
Referring to fig. 2 to 4, a production string according to an embodiment of the present disclosure may include: the screen pipe 3 is arranged in the horizontal well section, and screen slots 30 for communicating an oil layer with a well bore are arranged on the screen pipe 3; the blind pipe 4 is arranged in the sieve pipe 3; a plurality of packers 5, wherein the packers 5 are arranged in the annular space between the screen pipe 3 and the blind pipe 4, and two adjacent packers 5 are separated by a preset distance; a plurality of throttles 6, the throttles 6 are arranged in the blind pipe 4 and between two adjacent packers 5, a temperature monitoring part 60 is arranged on the throttles 6, and when the temperature monitored by the temperature monitoring part 60 reaches a predetermined temperature or higher, the throttles 6 are closed.
When the oil production string provided by the embodiment is particularly applied to the technical field of fire flooding development, oil reservoir fluid enters two well barrel sections sealed by packers 5 through the screen joints 30, then enters the blind pipe 4 through the restrictor 6 and then is produced along the blind pipe 4, so once the restrictor 6 is closed, the fluid is not produced in the section of the well barrel, air can be overflowed upwards and enters the next section of the well barrel, and the circulation is carried out until the heel part (heel end) of the well is burnt.
The heavy oil production pipe column that provides in the embodiment of this application, add packer 5 and choke holder 6 on blind pipe 4 in 2 screen pipes 3 of production well, choke holder 6 in blind pipe 4 has temperature monitoring portion 60, packer 5 divides into several sections with 2 horizontal well sections of production well, when the combustion chamber impels horizontal pit shaft, the temperature of temperature monitoring portion 60 on 6 of horizontal well casing section choke holder this moment exceeds 350 ℃, the choke holder 6 adjustment of this section is closed, the near pressure grow of choke holder 6 this moment, avoid the live wire to scurry into the pit shaft. The air arrives the burning front edge along the upper oil reservoir overlap, forms the stable burning front edge that leans forward, realizes the stable gravity draining development mode of segmentation cutting, as shown in figure 4 to avoid the air directly to get into the horizontal well pit shaft, guarantee that the fire flooding front edge burns steadily, have good security and good economic benefits.
In this embodiment, the screen 3 is located in a horizontal section of the production well 2. The sieve tube 3 is provided with sieve slots 30 for communicating the shaft and the oil layer, so that gas (steam) liquid can enter the gap between the sieve tube 3 and the blind pipe 4.
In particular, the horizontal section of the production well 2 has opposite toe and heel ends 21, 22, the screen 3 extending lengthwise from the toe end 21 to the heel end 22. The sieve tube 3 is provided with sieve slots 30. Oil from the drainage zone may flow into the horizontal wellbore section through the screen 3.
In the embodiment, a blind pipe 4 is arranged in the sieve tube 3, and the horizontal section of the production well 2 is divided into a plurality of sub well sections capable of controlling oil and gas to enter through cooperation with a packer 5 and a flow controller 6.
In the present embodiment, the number of packers 5 may be plural. In particular, the number of packers 5 may be determined according to the length of the horizontal wellbore section. When the length of the horizontal well section is longer, correspondingly, the number of the packers 5 is increased adaptively. Of course, the present application does not exclude the use of only one packer 5 in certain extreme cases, for example, where the length of the horizontal wellbore section is short.
In the present embodiment, the restrictor 6 is a through passage through which all fluid flows. The number of the restrictors 6 may be plural. Specifically, the number of the chokers 6 is matched with the number of the packers 5. The number of chokes 6 is also determined by the length of the horizontal shaft section as a whole. When the length of the horizontal well section is longer, the number of the throttles 6 is correspondingly increased. Of course, the present application does not exclude the use of only one choke 6 in certain extreme cases, for example, where the length of the horizontal wellbore section is short.
In the present embodiment, the throttle 6 has a flow rate adjusting function. Specifically, the choke 6 is provided with a temperature monitoring part 60, and when the temperature of the wellbore near the choke 6 monitored by the temperature monitoring part 60 exceeds a predetermined temperature, the choke 6 can be automatically closed. After the choke 6 is closed, the pressure near the choke 6 can be increased, so that air reaches a combustion front edge and cannot jump into a shaft from the well section, and the problems of fire line channeling and oxygen breakthrough in the horizontal well fireflood process can be avoided.
Of course, in addition to temperature monitoring by a temperature detector provided in the choke 6 itself, a temperature detector may be provided separately in the horizontal well bore of the production well 2, and a controller may be provided to electrically connect the temperature detector and the choke 6 and control the opening and closing of the choke 6 based on a temperature signal detected by the temperature detector.
The conditions for determining the opening/closing of the orifice 6 may be a flow signal of oil or a combination of both, in addition to the temperature, and the present application is not particularly limited herein.
In the present embodiment, the predetermined temperature is a temperature of high-temperature oxidation combustion of oil. The temperature of the high-temperature oxidation combustion is generally 350 ℃ or higher. That is, the predetermined temperature is 350 degrees celsius or more. When the temperature monitoring part 60 monitors that the temperature near the choke 6 exceeds the temperature of the high-temperature oxidation combustion, the temperature monitoring part indicates that the oil near the well section is subjected to the high-temperature oxidation combustion at the moment, the viscosity is reduced, the fluidity is improved, the well section can be opened, and the oil which is heated and reduced in viscosity at the position can be discharged.
In the present embodiment, the predetermined distance between the two packers 5 is the projected distance of the drainage band in the horizontal well section. When the distance between the two packers 5 is equal to the projection distance of the oil drainage zone in the horizontal well section, oil in the oil drainage zone can be drained into the corresponding sub-well section exactly during oil drainage. According to practical monitoring, the projection distance of the oil drainage zone in the horizontal well section is generally between 20 meters and 30 meters. Accordingly, the predetermined distance may be 20 to 30 meters.
Referring to fig. 5, the present application also provides a method for recovering heavy oil, which may include the steps of:
step S10: the method comprises the steps of running a blind pipe 4 in a screen pipe 3 of a horizontal shaft of a production well 2, running a plurality of packers 5 at intervals of a preset distance between the screen pipe 3 and the blind pipe 4, and running a choke 6 with a temperature monitoring part 60 between two adjacent packers 5 on the blind pipe 4 to divide the horizontal shaft of the production well 2 into a plurality of sections;
step S12: real-time temperature monitoring is performed by the temperature monitoring unit 60 of the throttle 6, and when the temperature monitored by the temperature monitoring unit 60 exceeds a predetermined temperature, the throttle 6 is closed.
First, a blind pipe 4 and a packer 5, a choke 6 having a temperature monitoring section 60 are run into a screen 3 of a horizontal well bore of a production well 2. As shown in fig. 2, a choke 6 and a separator can be lowered every 30m to divide the horizontal well bore of the production well 2 into several sections, thereby forming vertical section production.
In the horizontal well fire flooding production process, when the combustion chamber burns to the horizontal well section of the production well 2, the temperature of the section of the restrictor 6 is monitored and displayed to be higher than 350 ℃, and when air flows into the restrictor 6, the restrictor 6 is automatically closed. At this time, the pressure near the choke 6 becomes high, and air flows forward into the combustion front to keep the combustion stable in the fireflooding process.
When the horizontal well section of the next production well 2 is reached along with the propulsion of the combustion process, the throttleer 6 is over-high in temperature like the previous throttleer 6 and is automatically closed, so that the phenomenon that air directly enters a horizontal well shaft to generate oxygen channeling to burn the well shaft is avoided.
In a specific application scenario, for example, a block in the Xinjiang oil field has the following characteristics:
① porosity distribution, the reservoir porosity in this region is between 27.3% and 35.1%, with an average of 31.5%.
② permeability distribution, the reservoir permeability of the region is between 455.1mD and 4708mD, the average value is 2437.1mD, and the correlation with the porosity is strong.
③ the oil saturation distribution is that the oil saturation of the reservoir in the area is between 63.8% and 80.3%, the average value is 73.2%, and the oil saturation shows the situation of north high south low.
④ the oil layer thickness is spread, the oil layer thickness in the area is between 10.4-47.2 m, the average value is 31.5m, the oil layer thickness is lower at the north and south edges of the work area.
In a certain well group of the block, the vertical distance between the bottom boundary of a gas injection vertical well perforation and a horizontal well is 11.7 meters, the thickness of an oil layer above a horizontal production well 2 is 9.6m, and the gas injection vertical well is within 4m of the side surface of the horizontal well. After the heavy oil production pipe column and the method provided by the application are used for fireflooding, the following effects can be achieved: daily gas injection 4400m3And d, the daily oil production is about 4.5t/d, the combustion process is stable, and oxygen cannot flow into the horizontal well.
In summary, the heavy oil production pipe column and the method provided by the application are a technical method capable of controlling the stable propulsion of the burning front edge, and the throttler 6 is adjusted and closed in real time according to the monitoring temperature of the well barrel section in a period of fireflooding, so that the pressure near the throttler 6 is increased, air reaches the burning front edge, the fireflooding process is ensured to be stably carried out, oxygen channeling from the fireflooding process to the horizontal well barrel is avoided, and the method has good economic benefits.
In a whole, the oil production pipe and the oil production method thereof provided by the application are characterized in that a packer 5 and a throttleer 6 are additionally arranged on a blind pipe 4 in a sieve pipe 3 of a production well 2, a temperature monitoring part 60 is arranged on the throttleer 6 in the blind pipe 4, the horizontal well section of the production well 2 is divided into a plurality of sections by the packer 5, when a combustion cavity is pushed into a horizontal well shaft, the throttleer 6 of the section is adjusted and closed when the temperature of the temperature monitoring part 60 on the throttleer 6 of the horizontal well shaft section exceeds 350 ℃, a circulation channel between the blind pipe 4 of the horizontal well shaft and the throttleer 6 is closed, gas (steam) liquid fluid does not enter the well shaft section any more, fire wires and oxygen are prevented from flowing into the well shaft, and the fire wires and the oxygen cannot. The air can overlap along upper portion oil reservoir and reach the burning front edge, forms the stable burning front edge that slopes forward, continues stable burning at the well casing section that next packer 5 seals apart, realizes that the segmentation cutting stabilizes gravity drainage development mode to avoid the air directly to get into horizontal well pit shaft, guarantee that the burning is stabilized to the fireflood front edge, have good security and good economic benefits.
Any numerical value recited herein includes all values from the lower value to the upper value that are incremented by one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.
Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified.
All articles and references, including patent applications and publications, disclosed herein are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.
A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.
The above embodiments in the present specification are all described in a progressive manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment is described with emphasis on being different from other embodiments.
The above description is only a few embodiments of the present invention, and although the embodiments of the present invention are described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A heavy oil production string, comprising:
the screen pipe is used for being arranged in the horizontal well section, and screen slots used for communicating an oil layer and a shaft are arranged on the screen pipe;
the blind pipe is arranged in the sieve pipe;
a plurality of packers disposed in an annulus between the screen and the blind pipe, adjacent packers being spaced apart by a predetermined distance;
the plurality of throttles are arranged in the blind pipe and positioned between two adjacent packers, a temperature monitoring part is arranged on each throttler, and when the temperature monitored by the temperature monitoring part reaches a preset temperature or above, the throttlers are closed;
and oil reservoir fluid enters the two well barrel sections sealed by the packers through the screen joints, then enters the blind pipe through the throttler and is produced along the blind pipe.
2. The heavy oil production string of claim 1, wherein the predetermined distance is a projected distance of the drainage zone in the horizontal well section.
3. The heavy oil production string of claim 2, wherein the predetermined distance is 20 meters to 30 meters.
4. The heavy oil production string of claim 1, wherein the predetermined temperature is a temperature of high temperature oxidative combustion of the oil.
5. The heavy oil production string of claim 4, wherein the predetermined temperature is greater than 350 degrees Celsius.
6. A method for producing heavy oil, comprising:
the method comprises the following steps of putting a blind pipe in a sieve pipe of a horizontal shaft of the production well, putting a plurality of packers between the sieve pipe and the blind pipe at intervals of a preset distance, putting a throttler with a temperature monitoring part between two adjacent packers on the blind pipe, and dividing the horizontal shaft of the production well into a plurality of sections, wherein sieve gaps for communicating an oil layer and the shaft are arranged on the sieve pipe;
oil reservoir fluid enters two well barrel sections sealed by the packers through the screen joints, then enters the blind pipe through the throttler and is produced along the blind pipe;
and carrying out real-time temperature monitoring through a temperature monitoring part of the throttle, and closing the throttle when the temperature monitored by the temperature monitoring part exceeds a preset temperature.
7. The heavy oil recovery method of claim 6 wherein the predetermined distance is a projected distance of the drainage zone in the horizontal well section.
8. The heavy oil recovery method of claim 7, wherein the predetermined distance is 20 meters to 30 meters.
9. The method of recovering heavy oil of claim 6 wherein said predetermined temperature is the temperature of high temperature oxidative combustion of the oil.
10. The method for recovering heavy oil of claim 9 wherein said predetermined temperature is greater than 350 degrees celsius.
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| CN108590613B (en) * | 2018-03-23 | 2021-01-29 | 中国石油天然气股份有限公司 | Characterization method and device for secondary start displacement pressure of oil reservoirs at different temperatures |
| CN113803014B (en) * | 2020-06-11 | 2023-07-25 | 中国石油天然气股份有限公司 | Plugging method for horizontal well |
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| CN104963669A (en) * | 2015-07-02 | 2015-10-07 | 中国石油天然气股份有限公司 | Heavy oil thermal recovery method and well pattern thereof |
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| US20070042306A1 (en) * | 2003-10-10 | 2007-02-22 | Bacon David W | Apparatus for igniting combustible mediums |
| CA2832770A1 (en) * | 2012-11-14 | 2014-05-14 | Nexen Energy Ulc | Use of steam assisted gravity drainage with oxygen ("sagdox") in the recovery of bitumen in lean zones ("lz-sagdox") |
| CN103277077B (en) * | 2013-05-29 | 2016-01-06 | 中国石油天然气股份有限公司 | Based on fireflood assisted gravity drainage injection and extraction system and the note mining method of intelligent temperature control |
| CN204113256U (en) * | 2014-09-10 | 2015-01-21 | 中国石油天然气股份有限公司 | The anti-gas channeling experimental facilities of fireflood horizontal production well and horizontal production well device |
| CN205225217U (en) * | 2015-11-19 | 2016-05-11 | 中国石油天然气股份有限公司 | Intermittent type formula flue gas flooding oil production device |
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| CN104963669A (en) * | 2015-07-02 | 2015-10-07 | 中国石油天然气股份有限公司 | Heavy oil thermal recovery method and well pattern thereof |
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