CN117166974A - Thickened oil recovery equipment and using method thereof - Google Patents

Abstract

The application discloses thick oil exploitation equipment and a use method thereof, and belongs to the technical field of thick oil exploitation. The thick oil exploitation equipment comprises an oil pipe, a first packer, a second packer and a steam generator, wherein the oil pipe is suitable for extending into an injection well; the first packer and the second packer are arranged at intervals along the up-down direction and are suitable for closing a working section of an injection well, and the working section is provided with perforations which are used for being arranged opposite to an oil reservoir; the steam generator is adapted to be arranged in the working section. According to the thickened oil recovery equipment, the steam generator is suitable for being arranged in the working section, and the first packer and the second packer seal the working section along the up-down direction, so that the steam generator can generate hot steam with higher pressure, the hot steam is beneficial to being injected into an oil reservoir, and the utilization efficiency of the hot steam is improved; and the heat exchange efficiency of the steam generator can be improved, the hot steam yield is increased, the requirement of large-scale thick oil exploitation is met, and the thick oil yield is improved.

Description

Thickened oil recovery equipment and using method thereof

Technical Field

The application belongs to the technical field of thick oil exploitation, and particularly relates to thick oil exploitation equipment and a use method thereof.

Background

At present, a boiler of a steam station is mainly built on the ground for heat exploitation of thick oil, and a large amount of generated heat steam is conveyed to each production well through a pipeline, so that the thick oil in underground stratum is heated and is exploited in a huff-puff manner, and the exploitation mode is influenced by adverse factors such as long transmission distance, more limitation on terrain conditions, high requirement on heat preservation of a shaft and the like, so that the temperature of steam injected into the stratum is lower, and the comprehensive economic efficiency is low. In order to solve the problems, a novel thickened oil thermal recovery technology is provided, wherein generated steam is directly injected into a stratum in situ by directly using a small-sized steam generator underground, however, the existing underground steam generator is simple in structure, low in heat exchange efficiency and insufficient in steam yield, and cannot meet the requirement of large-scale exploitation.

Disclosure of Invention

The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides thick oil exploitation equipment and a use method thereof, which are used for solving the problems that the existing underground steam generator is simple in structure, low in heat steam utilization rate, low in heat exchange efficiency and insufficient in steam yield, and cannot meet the requirement of large-scale exploitation.

In a first aspect, the present application provides a thickened oil recovery apparatus comprising:

an oil pipe adapted to extend into the injection well;

a first packer and a second packer spaced apart in an up-down direction and adapted to close a working section of an injection well, the working section having perforations for placement opposite a reservoir;

a steam generator adapted to be arranged at the working section.

According to the thickened oil recovery equipment, the steam generator is suitable for being arranged in the working section, and the first packer and the second packer seal the working section along the up-down direction, so that the steam generator can generate high-pressure hot steam, the hot steam is injected into the oil reservoir from the perforation, and the utilization efficiency of the hot steam is improved; the heat exchange efficiency of the steam generator can also be improved, the yield of hot steam is increased, the temperature of an oil layer in a larger range is improved, underground crude oil in a larger range can be driven, the requirement of large-scale thick oil exploitation is met, and the yield of thick oil is improved.

According to one embodiment of the application, the steam generator comprises:

the shell is used for defining a heating cavity, and a water inlet and a water outlet which are communicated with the heating cavity;

a heater disposed in the heating chamber.

According to one embodiment of the application, the steam generator further comprises:

a coil disposed within a wall of the housing, the heater including a plurality of heating rods.

According to one embodiment of the application, the housing comprises:

an inner wall defining the heating chamber, the coil being embedded in the inner wall, one end of the inner wall defining the water inlet;

the outer wall is coated outside the inner wall, and the water outlet penetrates through the inner wall and the outer wall.

According to one embodiment of the application, the steam generator further comprises:

the heating rod is arranged between the first clamping ring and the second clamping ring at intervals.

According to one embodiment of the application, the first clamping ring is connected with the shell through a connecting handle, the first clamping ring is spaced from the shell to form a water inlet gap, and the first clamping ring can also be provided with a water inlet hole.

According to one embodiment of the application, the cross-sectional area of the water inlet is axially from large to small to large.

According to one embodiment of the application, the water outlet penetrates through the side wall of the shell and is obliquely arranged in a direction from inside to outside along the radial direction and away from the water inlet.

According to one embodiment of the application, the steam generator further comprises:

a temperature sensor disposed adjacent the water outlet;

and the control device is electrically connected with the temperature sensor and the coil and is used for controlling the working parameters of the coil based on the signals of the temperature sensor.

In a second aspect, the application provides a method of using a thickened oil recovery apparatus as described above, comprising the steps of:

sequentially connecting the second packer, the steam generator and the first packer by using oil pipes and putting the second packer, the steam generator and the first packer into an injection well;

controlling the first packer and the second packer to seal the working section of the injection well;

controlling the steam generator to work until the steam yield and the temperature reach target values;

turning off the steam generator;

controlling the first packer and the second packer to be unset, and taking out the steam generator from the injection well;

and (5) extracting thick oil.

According to the application method of the thick oil exploitation equipment provided by the embodiment of the application, the working section and the non-working section in the injection well can be separated by using the first packer and the second packer in the use of the steam generator in a matched way, and the steam generator is internally provided with the plurality of heating rods, so that the heat exchange efficiency of the steam generator can be improved, the injection of hot steam into the oil storage layer is facilitated, and the utilization efficiency of the hot steam is improved; meanwhile, the steam generator is controlled to work through the control system, so that the yield of thick oil exploitation can be controlled.

According to one embodiment of the application, the sequentially connecting and placing the second packer, the steam generator, and the first packer with tubing into the injection well comprises:

determining a target location of the first packer, the second packer, and the steam generator in the injection well based on the injection well parameters;

and connecting the second packer, the steam generator and the first packer to the corresponding positions of the oil pipe in sequence based on the target positions of the first packer, the second packer and the steam generator in the injection well, and placing the injection well.

According to one embodiment of the application, after the removing of the steam generator from the injection well, the method further comprises:

the steam generator is cleaned.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

The foregoing and/or additional aspects and advantages of the application will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic structural view of a thickened oil recovery apparatus provided by an embodiment of the present application;

FIG. 2 is a schematic cross-sectional elevation view of the steam generator of FIG. 1;

FIG. 3 is a left side view of the steam generator of FIG. 2;

FIG. 4 is a schematic diagram of the coil electromagnetic induction heating of FIG. 2;

fig. 5 is a schematic flow chart of a method for using the thickened oil recovery equipment according to the embodiment of the application.

Reference numerals:

an oil pipe 110;

a first packer 120;

a second packer 130;

the steam generator 140, the shell 141, the inner wall 141a, the outer wall 141b, the heating cavity 142, the water inlet 143, the water outlet 144, the heater 145, the heating rod 145a, the coil 146, the first clamping ring 147, the connecting handle 147a, the water inlet 147b, the second clamping ring 148 and the temperature sensor 149;

a control device 150;

a column shoe 160;

injection well 200;

a working section 210, perforations 211;

a sleeve 220;

a cement sheath 230;

a formation 300;

reservoir 400.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.

The application discloses thick oil exploitation equipment.

A thickened oil recovery apparatus according to an embodiment of the present application is described below with reference to fig. 1 to 5.

As shown in fig. 1, the thickened oil recovery apparatus includes: tubing 110, first packer 120, second packer 130, and steam generator 140.

The tubing 110 is adapted to extend into the injection well 200, the tubing 110 may be coiled tubing, and the first packer 120, the second packer 130, and the steam generator 140 may be mounted on the tubing 110, such that the first packer 120, the second packer 130, and the steam generator 140 may also extend into the injection well 200 to enable the steam generator 140 to be used directly within the injection well 200.

It should be noted that the packer is a downhole tool having an elastic sealing element, and thereby seals the annular space between various sized strings and the wellbore and between strings, and isolates the production zone to control production (injection) fluids, protecting the casing 220; the main element of the packer is a packing element, which is hydraulically or mechanically operated to expand and seal the annular space of tubing 110, and the packer is set to isolate the various formations 300.

It will be appreciated that different types of packers may be employed, such as self-sealing, compression, wedging, expansion, combination, etc., as the application is not limited in detail.

In the present application, the installation positions and the installation sequences of the first packer 120, the second packer 130 and the steam generator 140 can be designed according to different parameters of the injection well 200, and the first packer 120, the second packer 130 and the steam generator 140 are sequentially lowered to the corresponding positions in the injection well 200 through the oil pipe 110, so that the hot steam generated by the steam generator 140 can be injected into the stratum 300 in situ, the heat loss can be reduced, and the utilization rate of the hot steam can be improved.

It will be appreciated that injection well 200 is a well drilled into an oil reservoir at the edge or inside of an oil field for the purpose of maintaining or restoring reservoir pressure during the development of the oil field; injection well 200 may have a casing 220 and cement sheath 230 disposed therein; the injection wells 200 may be provided in one or more number, and the plurality of injection wells 200 may work together to improve the production efficiency of the oil field, which is not particularly limited in the present application.

As shown in fig. 1, the first packer 120 and the second packer 130 are spaced apart in an up-down direction, and the first packer 120 and the second packer 130 are adapted to close the working section 210 of the injection well 200 to achieve separation of the working section 210 from the non-working section within the injection well 200; the steam generator 140 is suitable for being arranged in the working section 210, because the working section 210 is in a closed state, when the steam generator 140 is electrified and water is injected, high-pressure hot steam can be generated, and the working section 210 is provided with the perforation 211 which is arranged opposite to the oil reservoir 400, and at this time, the high-pressure hot steam can be injected into the oil reservoir 400 through the perforation 211, so that the waste of the hot steam is avoided, and the utilization efficiency of the hot steam is improved.

It will be appreciated that when the first packer 120 and the second packer 130 are set, the pressure in the working section 210 is higher, so that the heat exchange efficiency of the steam generator 140 is higher, a large amount of hot steam can be generated, the working section 210 can be located in the reservoir 400 in the injection well 200, at this time, the first packer 120 and the second packer 130 are located at the upper and lower edges of the reservoir 400, and the steam generator 140 is located at the middle proper position of the reservoir 400, so that a large amount of hot steam under high pressure can enter the reservoir 400, thereby increasing the oil layer temperature in a larger range, driving underground crude oil in a larger range, meeting the requirement of large-scale heavy oil extraction, and increasing the heavy oil yield.

According to the thickened oil recovery equipment, the steam generator 140 is suitable for being arranged in the working section 210, and the first packer 120 and the second packer 130 seal the working section 210 along the up-down direction, so that the steam generator 140 can generate hot steam with higher pressure, the hot steam is beneficial to being injected into the oil reservoir 400 from the perforation 211, and the utilization efficiency of the hot steam is improved; the heat exchange efficiency of the steam generator 140 can also be improved, the yield of hot steam is increased, the temperature of an oil layer in a larger range is improved, underground crude oil in a larger range can be driven, the requirement of large-scale thick oil exploitation is met, and the yield of thick oil is improved.

In some embodiments, the steam generator 140 includes a housing 141 and a heater 145.

As shown in fig. 2, the housing 141 defines a heating chamber 142, and a water inlet 143 and a water outlet 144 communicating with the heating chamber 142, and a heater 145 is further disposed in the heating chamber 142; when the steam generator 140 is powered on, water needs to be injected into the steam generator 140, at this time, water flow can flow into the heating cavity 142 from the water inlet 143, hot steam can be generated after the water in the heating cavity 142 is heated by the heater 145, a steam outlet can be further arranged in the casing 141, and the generated hot steam is injected into the oil reservoir 400 from the perforation 211 after being discharged from the steam outlet, so that the utilization efficiency of the hot steam can be improved.

The water in the heating cavity 142 can be discharged from the water outlet 144 after being changed into steam, and in the actual working process, the water consumption requirement of the steam generator 140 for completely gasifying the water by controlling the water inflow and the pressure is just met.

It is understood that the shape of the housing 141 can be various, in the present application, the housing 141 is cylindrical, and in other embodiments, can be other shapes; in addition, the casing 141 may be made of various materials, such as stainless steel, aluminum, iron, copper, aluminum magnesium, etc.; the kind of the heater 145 may be various, such as an electromagnetic heater, an infrared heater, or a resistance heater; the shape of the water inlet 143 and the water outlet 144 may be various, such as rectangular, circular or elliptical, which is not limited in the present application

In some embodiments, the steam generator 140 further includes a coil 146.

As shown in fig. 2, the coil 146 is disposed in a wall surface of the housing 141, the coil 146 may be a spiral induction coil 146, and the housing 141 is provided with a heater 145 therein such that the heater 145 is surrounded by the coil 146, the heater 145 includes a plurality of heating rods 145a, the plurality of heating rods 145a may be disposed at radial intervals in the heating chamber 142, and the heating rods 145a may be hollow tubular metal; when the steam generator 140 is energized, an alternating magnetic field is established in and around the coil 146 by passing an alternating current through the plurality of heating rods 145a, and is cut, at this time, induced current is generated in a circuit formed by the plurality of heating rods 145a, and a large amount of electric charge is concentrated on the surfaces of the plurality of heating rods 145a, a large amount of heat is generated in a short time, so that the plurality of heating rods 145a are heated to a high temperature of several hundred degrees celsius, and a large amount of high-temperature water steam is generated by instantaneously vaporizing the passing water flow.

As shown in fig. 4, the electromagnetic induction heating principle of the coil 146 is faraday electromagnetic induction principle, the alternating current generates a varying magnetic field, the conductor in the varying magnetic field generates an induced current, and the current generates heat in the conductor, so that the object is heated, the electromagnetic induction heating only acts on the metal conductive material, the non-metal material cannot be directly heated, and the non-metal material can be indirectly heated.

It is understood that the heating rod 145a may be a solid tubular metal, and a large amount of charges are concentrated on the heating rod 145a, so that the overall temperature of the heating rod 145a is extremely high, and a large amount of water vapor is generated by instantaneous vaporization of water flowing toward the outer surface of the heating rod 145 a.

In some embodiments, the housing 141 includes an inner wall 141a and an outer wall 141b.

The inner wall 141a defines a heating cavity 142, a heater 145 is arranged in the heating cavity 142, and a coil 146 is embedded in the inner wall 141a, so that the coil 146 can increase the temperature of the heater 145 through electromagnetic induction heating, and one end of the inner wall 141a defines a water inlet 143, so that water flows into the heating cavity 142 from the water inlet 143 and generates hot steam after being heated by the heater 145; the coil 146 is embedded into the inner wall 141a, so that the space of the heating cavity 142 can be fully utilized while the coil 146 can work normally, the size of the shell 141 is reduced, and the manufacturing cost is reduced.

As shown in fig. 3, the outer wall 141b is coated outside the inner wall 141a, and the thickness of the outer wall 141b is greater than that of the inner wall 141a, so that the inner wall 141a can be protected; the water outlet 144 penetrates through the inner wall 141a and the outer wall 141b, so that the steam can be smoothly discharged out of the casing 141 through the water outlet 144.

In the present application, the outer wall 141b is made of a metal material, so that the corrosion resistance of the casing 141 can be improved, and the service life of the casing 141 can be prolonged; the inner wall 141a is made of heat insulation material, so that heat generated when the coil 146 heats the plurality of heating rods 145a is concentrated in the heating cavity 142, heat dissipated to the outside is greatly reduced, heat is not easy to dissipate, heat waste is low, and heat efficiency can be further improved.

In some embodiments, the steam generator 140 further includes a first snap ring 147 and a second snap ring 148.

As shown in fig. 3, the first clamping ring 147 and the second clamping ring 148 are arranged at intervals along the axial direction, the heating rod 145a is arranged between the first clamping ring 147 and the second clamping ring 148 at intervals, and multiple groups of heating rods 145a are distributed circularly along the bodies of the first clamping ring 147 and the second clamping ring 148.

In some embodiments, the first clamping ring 147 is connected with the casing 141 through the connecting handle 147a, and the connecting handle 147a and the casing 141 can be connected through welding, so that the connection between the first clamping ring 147 and the casing 141 is stable, the internal structure of the steam generator 140 can be stable, and the normal operation of the steam generator 140 can be ensured; of course, the connection handle 147a and the housing 141 may be connected by other manners, such as integrally formed, which is not particularly limited in the present application.

As shown in fig. 3, the first snap ring 147 is spaced apart from the case 141 to form a water inlet gap, and the first snap ring 147 is disposed adjacent to the water inlet 143 such that water flow from the water inlet 143 can be injected into the heating chamber 142 of the steam generator 140 through the water inlet gap and generate high-temperature water vapor after being heated; the first clamping ring 147 can be provided with a plurality of water inlets 147b, the plurality of water inlets 147b can be arranged on the first clamping ring 147 at random, so that water inlet at different positions on the first clamping ring 147 can be ensured, and the problems of water flow speed, overlarge pressure and uneven heating caused by water inlet at a single position are avoided; meanwhile, the water in the water inlet 143 can be uniformly split, so that the water can flow into the heating cavity 142 and then fully exchange heat with the heating rod 145a, the heat energy utilization rate is improved, and the hot steam yield is more stable and reliable.

It can be understood that the second clamping ring 148 can also be connected with the casing 141 through the connecting handle 147a, and the connection between the second clamping ring 148 and the casing 141 is stable, so that the heating rod 145a is stably arranged in the heating cavity 142, the internal structural stability of the steam generator 140 is further improved, and the normal operation of the steam generator 140 is ensured; meanwhile, the second clamping ring 148 and the casing 141 may be separated to form an air outlet gap, and a steam outlet may be provided at the side of the second clamping ring 148, so that the high-temperature steam generated in the heating cavity 142 may be discharged out of the casing 141 through the water outlet 144 in time; the second clamping ring 148 is not provided with a water outlet hole, so that the water flow can be prevented from being discharged without being sufficiently heated, and the heat exchange efficiency can be ensured; the generated hot steam and the water flow in the heating cavity 142 can be prevented from interfering with each other, and the temperature and dryness of the hot steam are not influenced.

In some embodiments, the cross-sectional area of the water inlet 143 is axially from large to small to large, and as the cross-sectional area of the water inlet 143 is axially from large to small, the diameter at the water inlet 143 becomes smaller and arc-shaped, facilitating the water flow to become a rapid turbulent flow state therein, providing a higher initial velocity for the water flow, facilitating the water flow to flow toward the heating rod 145a; when the cross-sectional area of the water inlet 143 is axially reduced to be larger, the diameter of the water inlet 143 is reduced and the water inlet is in a horn shape, so that the contact range of the water flow and the first clamping ring 147 is enlarged, water can be uniformly distributed to the plurality of heating rods 145a, the evaporation surfaces of the plurality of heating rods 145a can be fully utilized, and the evaporation effect and the thermal efficiency of the heating rods 145a are improved.

Meanwhile, the cross-sectional area of the water inlet 143 is from large to small to large along the axial direction, so that water column and tension are not easy to form at the water inlet 143 of the steam generator 140, the formation amount of the water column is reduced or the formation of the water column is avoided, and adverse influence of the water column on the operation of the steam generator 140 can be reduced; meanwhile, the water column is prevented from forming at the water inlet 143 of the steam generator 140, so that noise in the operation process of the steam generator 140 can be reduced, and the stability of steam generation and the stability of temperature monitoring data in the use process of the steam generator 140 are ensured.

In some embodiments, the water outlet 144 penetrates through the sidewall of the case 141, so that the steam generated by the heating chamber 142 can be discharged out of the case 141 through the water outlet 144; the water outlet 144 is arranged along the direction away from the water inlet 143, so that the water flow can be ensured to fully contact the heating rod 145a after entering the heating cavity 142 from the water inlet 143, and the evaporation effect of the heating rod 145a on the water flow is ensured; meanwhile, the water outlet 144 is obliquely arranged from inside to outside along the radial direction, so that the flow path of the steam flow can be more matched, the resistance of the steam flow to discharge can be reduced, the steam flow is discharged conveniently, and the operation efficiency of the steam generator 140 is improved.

In some embodiments, the heavy oil recovery apparatus may further comprise: a temperature sensor 149 and a control device 150.

The temperature sensor 149 is arranged adjacent to the water outlet 144, so that the temperature sensor 149 can feed back steam temperature data in time, and the real-time monitoring of the temperature of the heating cavity 142 is realized; the control device 150 is electrically connected to the temperature sensor 149 and the coil 146, and is configured to control the working parameters of the coil 146 based on the signal of the temperature sensor 149, and can control and adjust the yield of hot steam generated by the steam generator 140 through various parameters such as temperature, flow, voltage, frequency, etc., thereby achieving the purpose of controlling the yield of thickened oil recovery.

In some embodiments, the heavy oil recovery apparatus may further comprise: the water pump is used for supplying water to the water inlet 143 of the steam generator 140, and is electrically connected with the control device 150, and the control device 150 is also used for controlling the water inflow, the water inflow speed, the water inflow pressure and the like.

As shown in fig. 5, the embodiment of the application also provides a using method based on the thick oil exploitation equipment, which comprises the following steps:

step 510, placing the second packer 130, the steam generator 140, and the tubing 110 of the first packer 120 in sequence into the injection well 200.

The first packer 120, the second packer 130, and the steam generator 140 may be installed on the tubing 110 by threaded connections and the tubing 110 with the first packer 120, the second packer 130, and the steam generator 140 installed is lowered into place in the injection well 200 by a coiled tubing 110 work vehicle. When installed, the tubing 110 is lowered down a section, and the second packer 130, steam generator 140, and first packer 120 are connected in sequence in the appropriate location of the tubing 110.

Step 520, controlling the first packer 120 and the second packer 130 to close the working section 210 of the injection well 200.

It will be appreciated that controlling the first packer 120 and the second packer 130 to set by hydraulic or mechanical action to separate the active section 210 from the inactive section within the injection well 200 may avoid wasting hot steam flowing to the inactive section.

In one embodiment, the first packer 120 and the second packer 130 may be hydraulic packers driven by the pressure differential between the tubing 110 and the casing 220 at the packers, and a method of temporarily plugging the tubing 110 may be provided at the bottom of the tubing 110 below the packers or the packers themselves, typically a ball seat secured by shear pins; when the packer is lowered to the set depth, the ground is thrown into balls and pumped in, falls on the ball seat and presses so that the main body moves downwards; the stripper rubber will be compressed and expanded against the casing 220 and the cone is depressed behind the slips pushing them outwardly to grip the casing 220; a plurality of safety pins are usually installed in the packer, so that the premature starting of the setting process is avoided; as the pressure in the tubing 110 increases further, shearing the pin, after which the set pressure will be released and the packer will remain in place.

Step 530, controlling the operation of the steam generator 140 until the steam yield and the temperature reach the target values.

The whole device is connected with the ground control device 150 through a pipeline and a circuit and is provided with a data analysis and control system; after the ground control device 150 is started, the steam generator 140 is powered on and water is injected, parameters of the steam generator 140 are adjusted according to the data analysis system, and the steam generation amount and the temperature are obtained until the steam generation amount and the temperature reach target values.

It should be noted that, the steam injection amount can affect the exploitation effect of the thick oil, when the steam injection amount is too low, the purpose of heating the oil layer can not be achieved, and along with the increase of the steam injection amount, the heating range is enlarged, and the oil yield is increased; however, when the steam injection quantity exceeds a certain range, crude oil near a shaft is driven to a far place, so that the throughput oil extraction is not facilitated; it is necessary to control the yield and temperature of the hot steam.

Step 540, turn off the steam generator 140.

According to the predetermined oil recovery target data, the parameters of the steam generator 140 are determined, and when the steam yield and the temperature reach the predetermined values, the steam generator 140 can be stopped to realize the control of the thick oil recovery yield.

Step 550, controlling the first packer 120 and the second packer 130 to unset and removing the steam generator 140 from the injection well 200.

When the first packer 120 and the second packer 130 are unset, the friction force between the oil pipe 110 and the sleeve 220 may be used to raise the oil pipe 110 to shear the unset pin, raise the oil pipe 110, move the main mandrel upwards, remove the pressure between the main mandrel and the inner rubber cylinder, and wait until the rubber cylinder is retracted to realize unset.

Step 560, extracting thick oil.

The extraction of the thick oil may be performed using a christmas tree or an oil extractor, which is not particularly limited in the present application.

According to the method for using the thickened oil recovery equipment provided by the embodiment of the application, the working section 210 and the non-working section in the injection well 200 can be separated by using the first packer 120 and the second packer 130 in the use of the steam generator 140, and the steam generator 140 is internally provided with the plurality of heating rods 145a, so that the heat exchange efficiency of the steam generator 140 can be improved, the injection of hot steam into the oil reservoir 400 is facilitated, and the utilization efficiency of the hot steam is improved; while the steam generator 140 is controlled to operate by a control system to achieve controllable production of heavy oil.

In some embodiments, step 510, sequentially placing the second packer 130, the steam generator 140, and the tubing 110 of the first packer 120 into the injection well 200, comprises:

step 501, determining a target position of the first packer 120, the second packer 130, and the steam generator 140 in the injection well 200 based on the injection well 200 parameters.

In this step, the parameter information of the injection well 200 includes the position information of the formation 300 and the reservoir 400, and is specifically represented as a depth parameter of the shoe 160 from the ground. Of course, in other embodiments, the location parameters may be set as desired, which is not limited by the present application.

Step 502, based on the target positions of the first packer 120, the second packer 130 and the steam generator 140 in the injection well 200, sequentially connecting the second packer 130, the steam generator 140 and the first packer 120 to the corresponding positions of the tubing 110 and placing the injection well 200.

In this step, the installation positions and the installation sequences of the first packer 120, the second packer 130 and the steam generator 140 need to be arranged based on the position information of the oil reservoir 400, the second packer 130, the steam generator 140 and the first packer 120 are sequentially connected to the oil pipe 110, and the oil pipe 110 is arranged downwards while the first packer 120 is arranged at the upper edge position of the oil reservoir 400, the second packer 130 is arranged at the lower edge position of the oil reservoir 400, and the steam generator 140 is arranged at the proper position in the middle of the oil reservoir 400.

In some embodiments, after removing the steam generator 140 from the injection well 200, the method further comprises:

step 551, cleaning the steam generator 140.

It can be understood that the steam generator 140 is operated for a period of time, and scale and rust phenomena are difficult to avoid, the root factor of the scale generated by the steam generator 140 is that the water contains hardness components, after the water is heated at high temperature and concentrated by high pressure and continuously evaporated, various physical and chemical reactions occur, hard and tight scale can be generated on the surface of the heating rod 145a, the heat loss of the steam generator 140 is increased, and the heat exchange effect is reduced; therefore, the cleaning of the steam generator 140 not only can realize the repeated use of the steam generator 140, but also can ensure the heat exchange efficiency of the steam generator 140 and can prolong the service life of the steam generator 140.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

In the description of the present application, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the application.

In the description of the application, a "first feature" or "second feature" may include one or more of such features.

In the description of the present application, "plurality" means two or more.

In the description of the application, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.

In the description of the application, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the application, the scope of which is defined by the claims and their equivalents.

Claims (12)

1. A thickened oil recovery apparatus, comprising:

an oil pipe adapted to extend into the injection well;

a first packer and a second packer spaced apart in an up-down direction and adapted to close a working section of an injection well, the working section having perforations for placement opposite a reservoir;

a steam generator adapted to be arranged at the working section.

2. The thick oil recovery apparatus of claim 1, wherein the steam generator comprises:

the shell is used for defining a heating cavity, and a water inlet and a water outlet which are communicated with the heating cavity;

a heater disposed in the heating chamber.

3. The thick oil recovery apparatus of claim 2, wherein the steam generator further comprises:

a coil disposed within a wall of the housing, the heater including a plurality of heating rods.

4. A thickened oil recovery apparatus as claimed in claim 3, wherein the housing comprises:

an inner wall defining the heating chamber, the coil being embedded in the inner wall, one end of the inner wall defining the water inlet;

the outer wall is coated outside the inner wall, and the water outlet penetrates through the inner wall and the outer wall.

5. A thickened oil recovery apparatus as claimed in claim 3, wherein the steam generator further comprises:

the heating rod is arranged between the first clamping ring and the second clamping ring at intervals.

6. The thickened oil recovery apparatus of claim 5, wherein the first snap ring is connected to the housing by a connection handle, the first snap ring being spaced apart from the housing to form a water intake gap, the first snap ring further providing a water intake aperture.

7. A thickened oil recovery apparatus according to any one of claims 2-5, characterized in that the cross-sectional area of the water inlet is axially from large to small to large.

8. A thickened oil recovery apparatus according to any one of claims 2 to 5, wherein the water outlet extends through the side wall of the housing and is inclined in a direction radially from the inside to the outside away from the water inlet.

9. A thickened oil recovery apparatus according to any one of claims 3 to 5, further comprising:

a temperature sensor disposed adjacent the water outlet;

and the control device is electrically connected with the temperature sensor and the coil and is used for controlling the working parameters of the coil based on the signals of the temperature sensor.

10. A method of using a thickened oil recovery apparatus as claimed in any one of claims 1 to 9, comprising:

sequentially connecting the second packer, the steam generator and the first packer by using an oil pipe and putting the second packer, the steam generator and the first packer into an injection well;

controlling the first packer and the second packer to seal the working section of the injection well;

controlling the steam generator to work until the steam yield and the temperature reach target values;

turning off the steam generator;

controlling the first packer and the second packer to be unset, and taking out the steam generator from the injection well;

and (5) extracting thick oil.

11. The method of claim 10, wherein sequentially connecting and placing the second packer, the steam generator, and the first packer into the injection well with tubing comprises:

determining a target location of the first packer, the second packer, and the steam generator in the injection well based on the injection well parameters;

and connecting the second packer, the steam generator and the first packer to corresponding positions of the oil pipe in sequence based on the target positions of the first packer, the second packer and the steam generator in the injection well, and placing the injection well.

12. The method of use according to claim 10 or 11, wherein after said removing the steam generator from the injection well, the method further comprises:

the steam generator is cleaned.