CN106555574B - Sand prevention and steam injection integrated device and method - Google Patents
Sand prevention and steam injection integrated device and method Download PDFInfo
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- CN106555574B CN106555574B CN201510621120.8A CN201510621120A CN106555574B CN 106555574 B CN106555574 B CN 106555574B CN 201510621120 A CN201510621120 A CN 201510621120A CN 106555574 B CN106555574 B CN 106555574B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The invention relates to an oil gas steam injection exploitation device for an oil field, in particular to a sand prevention and steam injection integrated device. The invention also relates to a method for realizing sand prevention and steam injection by using the sand prevention and steam injection integrated device. The invention discloses a sand prevention and steam injection integrated device which is formed by sequentially connecting a first heat insulation oil pipe, a heat insulation underground compensator, a second heat insulation oil pipe, a steam injection check valve, a packing device, an insertion pipe sealing device and at least one sand prevention steam injection unit.
Description
Technical Field
The invention relates to an oil gas steam injection exploitation device for an oil field, in particular to a sand prevention and steam injection integrated device. The invention also relates to a method for realizing sand prevention and steam injection by using the sand prevention and steam injection integrated device.
Background
In the steam injection thermal recovery process of the thick oil reservoir of the oil field, the general steam injection recovery mode accounts for more than 96 percent, the vertical steam absorption profile is generally exposed to the problem of non-uniformity under the influence of the non-uniformity among multiple thin-layer thick oil reservoir layers, the steam absorption thickness of the oil layer only accounts for 30 to 50 percent of the total thickness, the contradiction among the reservoir layers is prominent, and the utilization degree of the oil reservoir is seriously influenced.
In the current development process of heavy oil wells, sand control is performed before steam injection, a packer is used for placing an oil layer section sand control tubular column and a sleeve annular space to fill gravel sand bodies for sealing after sand control, and then a conventional steam injection tubular column is used for steam injection. In the steam injection process, the steam flow and dryness are controlled to a certain degree mainly by adopting a steam distribution nozzle with a specific structure in the prior art, and three process modes are commonly used in the field: a layered quantitative steam injection process, a single-pipe layered steam distribution process and a concentric pipe layered steam injection process. The layered quantitative steam injection process injects one unit through a separate injection valve, injects a ball to seal a steam injection channel after reaching the steam injection amount, and injects the other unit, and because the steam injection amount of each steam injection unit is fixed in the process mode, the control or adjustment is not required through machinery or the size of a pore channel; the concentric tube layered steam injection process well head adopts double suspension, two sections of oil layers are separated by a suspension sealer and a layered steam injection packer underground, layered steam injection is realized between an inner tube and an outer tube through telescopic sliding seal, steam enters the inner tube and the outer tube from two channels on the ground respectively, and steam flow control of the two steam injection channels is realized through a ground distribution flow; the current mature single-pipe layered steam distribution process divides an oil layer into more than 2-3 independent steam injection units in the same well section, carries out layered steam distribution on the oil layer in one-time steam injection, and distributes steam according to different characteristics of each oil layer according to a design proportion, thereby meeting the requirements of layered steam injection.
Therefore, in the existing sand prevention and steam injection process, the sand prevention and steam injection process is complex, the problem of unbalanced steam dryness distribution among layers is easily caused due to the adoption of a double-pipe column structure, the steam enthalpy ratio distributed to each oil layer is inconsistent with the steam flow ratio, the steam enthalpy cannot be effectively distributed and utilized, in addition, the heat loss is serious in the steam injection process, the sleeve is easily damaged, and the like, and the problems become problems which need to be solved urgently in the sand prevention and steam distribution process.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a sand prevention and steam injection integrated device. The integrated device can realize the functions of sand prevention and steam injection by one set of pipe column in the process of thick oil exploitation, can realize steam injection with single pipe and equal dryness, and is particularly suitable for steam injection exploitation of multiple oil layers. The invention also relates to a method for preventing sand and injecting steam by using the sand-prevention and steam-injection integrated device.
According to the first aspect of the invention, a sand prevention and steam injection integrated device is provided, and is formed by sequentially connecting a first heat insulation oil pipe, a heat insulation underground compensator, a second heat insulation oil pipe, a steam injection check valve, a packing device, an insertion pipe sealing device and at least one sand prevention steam injection unit, wherein the sand prevention steam injection unit comprises a duplex joint, an outer sand prevention device and an inner steam injection device, the inner steam injection device is positioned in an inner cavity of the outer sand prevention device, the outer sand prevention device is connected with external threads at the lower end part of the duplex joint, and the outer sand prevention device is a screen mesh type sand filtering pipe; the inner steam injection device is formed by sequentially connecting a steam distributor and a steam injection distributor, the upper end part of the steam distributor is connected with the internal thread at the lower end part of the duplex joint, and the lower end part of the steam distributor is connected with the steam injection distributor.
As an improvement of the invention, the integrated device comprises a plurality of sand-proof steam injection units, and long-acting steam drive sealers are connected between the adjacent sand-proof steam injection units to separate and seal different oil layers; the packer is a steam driven packer.
The integrated device also comprises a safety joint, one end of the safety joint is connected with the intubation tube sealing device, and the other end of the safety joint is connected with the duplex joint; the second heat insulation oil pipe is connected with the steam injection check valve through a long-acting steam drive sealing device.
The heat-insulation underground compensator comprises an inner sliding pipe and a first sealing chamber sleeved on the outer side of the inner sliding pipe, a first sealing assembly is arranged between the inner sliding pipe and the first sealing chamber, and a first pressing cap is further arranged at the upper end of the first sealing chamber and used for improving the sealing effect of the first sealing chamber; the heat-insulation underground compensator also comprises a heat-insulation outer pipe connected with the lower end of the first sealing chamber, and variable buckle joints are arranged at the two ends of the heat-insulation underground compensator.
As a further improvement of the invention, the long-acting steam driven sealer comprises a hollow central tube, wherein a sealing part is arranged on the outer wall of the central tube, a heat-sensitive bimetal is arranged on the outer wall of the sealing part in a surrounding manner, and a high-temperature-resistant rubber barrel is arranged on the outer wall of the heat-sensitive bimetal in a surrounding manner.
The sealing component comprises a second sealing chamber, a second sealing assembly and a second pressing cap, the second sealing chamber is sleeved on the outer wall of the central tube, the second sealing assembly is arranged between the central tube and the second sealing chamber, and the upper end of the second sealing assembly is fixed by the second pressing cap.
The upper end and the lower end of the high-temperature resistant rubber cylinder are respectively provided with an upper baffle ring and a lower baffle ring, the lower end part of the lower baffle ring is provided with a pin, and the lower baffle ring, the second sealing chamber and the central pipe are connected together through the pin; an anti-collision ring is arranged below the lower retaining ring and on the outer wall of the central tube.
As another improvement of the invention, the steam distributor is formed by connecting a rectifier, a phase separation device in the pipe and a steam injection branch pipe; the inner cavity of the in-pipe separating device is provided with a partition plate taking the axis of the inner cavity as an axis, the two end lines of the partition plate are in sealing fit with the inner cavity of the in-pipe separating device, the inner cavity of the in-pipe separating device is divided into two parts of inner cavities, one part of the inner cavities are communicated with the steam injection distributor and can directly inject steam into an oil layer, and the other part of the inner cavities are connected with the steam injection branch pipe and introduce the steam into the next oil layer.
As a further improvement of the invention, the inner cavity of the rectifier is provided with a rotational flow sheet which is spirally distributed; the inner cavity of the steam injection distributor is provided with a conical diffusion surface.
According to a second aspect of the present invention, there is provided a method for sand control and steam injection using the integrated sand control and steam injection device according to the above, comprising the steps of:
the method comprises the following steps: chemical sand control is filled in the ground.
Firstly, putting a sand injection pipe column, and uniformly adding high-temperature precoated sand into an oil layer;
after sand injection, directly replacing oil field water underground through a sand injection pipe column, completely replacing high-temperature precoated sand in the pipe column with the sand injection pipe column, lifting the sand injection pipe column, closing the well and waiting for setting;
a drilling plug pipe column is put in, a plug is drilled, the well is back-washed until liquid is completely discharged, and the drilling plug pipe column is taken out;
and finally, putting the pipe scraping pipe column, performing well dredging and casing checking, pipe scraping and well washing until liquid is completely discharged, and pulling out the pipe scraping pipe column.
Step two: and (4) assembling, setting-in sand prevention and steam injection integrated device.
Selecting the same number of sand-proof steam injection units according to the number of layers of the steam injection layer required;
connecting and fixing the sand prevention and steam injection integrated device, and connecting a plurality of sand prevention and steam injection units through a long-acting steam drive sealer;
after the device is assembled, the sand control and steam injection integrated device is put into the underground, so that the position of the sand control steam injection unit corresponds to the position of an oil layer needing steam injection.
Step three: and injecting nitrogen into the annular space.
Nitrogen is injected into the oil sleeve annulus through the sleeve valve, annular liquid is displaced out of the oil sleeve annulus, and the heat insulation effect is further improved while the scale formation of the tool is reduced.
Step four: steam is injected in layers with equal dryness.
The steam injection pipe line is connected with the ground, the furnace is opened for steam injection, steam enters the sand control and steam injection integrated device from the ground steam transmission pipe line, the long-acting steam drive sealer gradually expands and seals along with the temperature rise of the steam injection pipe column, so that the sealing and interval sealing of oil layers are realized, the steam dryness distribution is equal through the underground steam distributor, and further the steam injection distributor performs steam injection on the corresponding oil layers, so that the single-pipe equal-dryness layered sand control and steam injection are realized.
Compared with the prior art, the steam injection device has the advantages that through the integrated design of the sand prevention device and the steam injection device, the effect that one set of pipe column can simultaneously play the roles of sand prevention and steam injection is realized, the process procedure is simplified, and the occurrence of complex conditions is avoided; simultaneously, through the cooperation use of distributor and injection allocation ware, can realize single tube layering sand control, wait the dryness fraction and annotate vapour, guarantee that the steam enthalpy ratio and the steam flow ratio of distributing each oil reservoir keep unanimous, in addition, through the steam drive packer, long-term steam drives the combined use of sealer, intubate sealing device and thermal-insulated compensator in the pit, improved the heat-seal effect and the heat utilization ratio of tubular column, avoided the heat loss, also alleviateed the injury of steam to the sheathed tube to sand control and notes vapour effect have effectively been improved.
Drawings
FIG. 1 is a schematic view of a sand control and steam injection integrated device of the present invention;
FIG. 2 is a half sectional view of the insulated downhole compensator of FIG. 1;
FIG. 3 is a half sectional view of the steam driven packer of FIG. 1;
figure 4 is a half sectional view of the cannula sealing device of figure 1.
FIG. 5 is a schematic view of the vapor dispenser of FIG. 1 coupled to a vapor dispenser.
Detailed Description
The detailed description and technical contents of the present invention are described below with reference to the accompanying drawings, which are provided for reference and illustration purposes only and are not intended to limit the present invention.
FIG. 1 is a schematic view of the sand control and steam injection integrated device of the present invention. The sand prevention and steam injection integrated device is formed by sequentially connecting a first heat insulation oil pipe 1, a heat insulation underground compensator 2, a second heat insulation oil pipe 3, a long-acting steam drive sealer 4, a steam injection check valve 5, a steam drive packer 6, an insertion pipe sealing device 7, a safety joint 8 and a sand prevention steam injection unit 9, wherein the sand prevention steam injection unit 9 comprises a duplex joint 91, a screen type sand screen 92 and an internal steam injection device, the internal steam injection device is positioned in the inner cavity of the screen type sand screen 92, and the screen type sand screen 92 is connected with external threads at the lower end part of the duplex joint 91; the inner steam injection device is formed by sequentially connecting a steam distributor 93 and a steam injection distributor 94, the upper end part of the steam distributor 93 is connected with the internal thread at the lower end part of the duplex joint 91, and the lower end part of the steam distributor 93 is connected with the steam injection distributor 94. A long-acting steam drive sealer 4 is connected between the adjacent sand-proof steam injection units 9 to separate and seal different oil layers; one end of the safety joint is connected with the intubation tube sealing device, and the other end of the safety joint is connected with the duplex joint.
As can be seen from fig. 2, the insulated downhole compensator 2 comprises an inner slide 22, the upper end of which is connected with an upper buckle adapter 21 connected with the insulated tubing 1, and the lower end of which is connected with a baffle ring 27; the first sealing chamber 25 is sleeved outside the inner sliding pipe 22, a first sealing assembly 24 is arranged between the inner sliding pipe 22 and the first sealing chamber 25, and a first pressing cap 23 is connected to the upper end of the first sealing chamber 25, is arranged on the outer wall of the inner sliding pipe 22 in a surrounding manner, and is used for fixing the first sealing assembly 24 so as to improve the sealing effect of the first sealing chamber 25; and the upper end of the heat insulation outer pipe 26 is connected with the lower end of the first sealing chamber 25, and the lower end of the heat insulation outer pipe is connected with a lower buckle-changing connector 28 and is connected with the second heat insulation oil pipe 3.
The long-acting steam-driven sealer comprises a hollow central pipe, wherein a sealing part is arranged on the outer wall of the central pipe, thermosensitive bimetal is arranged on the outer wall of the sealing part in an enclosing manner, and a high-temperature-resistant rubber barrel is arranged on the outer wall of the thermosensitive bimetal in an enclosing manner. In a preferred embodiment, the sealing member includes a second sealing chamber, a second sealing assembly and a second pressing cap, the second sealing chamber is sleeved on the outer wall of the central tube, the second sealing assembly is arranged between the central tube and the second sealing chamber, and the upper end of the second sealing assembly is fixed by the second pressing cap. The upper end and the lower end of the high-temperature-resistant rubber cylinder are respectively provided with an upper baffle ring and a lower baffle ring, the lower end part of the lower baffle ring is provided with a pin, and the lower baffle ring, the second sealing chamber and the central pipe are connected together through the pin to restrict the radial displacement of the high-temperature-resistant rubber cylinder. An anti-collision ring is arranged below the lower retaining ring and on the outer wall of the central tube. The upper end of the central tube is connected with a joint.
As can be seen in fig. 3, the steam-flood packer 6 comprises an upper joint 61, a pin 62, a seal ring 63, a setting piston 64, an inner center tube 65, a cylinder sleeve 66, a force-transmitting sleeve 67, a lock ring 68, a fishing head 69, an outer sleeve 610, an unpacking sleeve 611, a shear pin 612, a packing upper retainer 613, a sleeve 614, a packing 615, a packing lower retainer 616, an upper cone 617, a slip cover 618, a slip 619, a center tube 620, a locking claw 621, a sliding sleeve 622, and a lower joint 623. Setting: after the steam-driven packer 6 is lowered to a preset position, a steel ball is thrown into an oil pipe, when hydraulic pressure is transmitted to a hydraulic setting part of the packer, the setting part pushes the force transmission sleeve 67 to move downwards under the action of the hydraulic pressure, the force transmission sleeve 67 firstly cuts off the setting shear pin 6121 through the upper baffle ring 613 of the packing part and the sleeve 614, then the upper cone 617 of the packer and the packing part 615 are pushed to move downwards, the distance between the two cones is reduced, and the slips 619 are opened and supported on the wall of the sleeve. The force transfer sleeve 67 continues to move downward shearing the setting 6122, pushing the packing upper retainer ring 613 to compress the packing 615, expanding the outer diameter of the packing 615, and packing the oil jacket annular space. And meanwhile, the packing part 615 and the slips 619 are locked by the locking mechanism, and the setting is finished. And continuing to press to shear the pin of the hydraulic release part, pushing the support ring to move downwards by the setting sliding sleeve 622, so that the locking claw 621 loses the inner support, and when the pipe string is lifted up, the locking claw 621 retracts into the central pipe 65 of the packer, so that the hydraulic setting part and the inner central pipe 65 of the packer 6 are separated from the body of the packer 6, and release is realized. And if the pressure rises to the design pressure and the packer is not released, the pipe column is rotated forward, and the packer is forcibly released by utilizing the forcible releasing part of the packer. Deblocking: the fishing tool is put into the well, after the fishing head 69 of the packer is fished, the pipe column is lifted upwards, the deblocking pin is cut off, the pipe column is continuously lifted upwards, the deblocking sleeve 611 starts to move upwards, the locking ring 68 is opened, the locking mechanism is disabled, the pipe column is lifted upwards, and the deblocking sleeve drives the force transmission sleeve 67 and the upper blocking ring 613 of the packer to release the packer 615; then the upper blocking ring 613 of the packer and the sleeve 614 drive the upper cone 617 to move upwards, the distance between the two cones is expanded, the slips 619 retracts under the action of the spring force, the packer 6 is released, and the unpacking is realized.
As can be seen from fig. 4, the cannula sealing device 7 comprises a cannula 72, the upper end of which is connected with a centralizer 71, and is connected with the steam injection check valve 5; the sealing chamber 74 is sleeved at the lower end of the insertion pipe 72, a sealing assembly 75 is arranged between the insertion pipe 72 and the sealing chamber 74, the upper end of the sealing assembly 75 is fixed through a pressing cap 73 and is connected to the upper end of the sealing chamber 74, and the upper end of the pressing cap 73 is provided with a buckle joint and is connected with the steam-driven packer 6; the lower end of the sealing chamber 74 is provided with a buckle-changing joint which is connected with the safety joint 8.
From the illustration of FIG. 5: the steam distributor 93 comprises a rectifier 931, the lower end of the rectifier 931 is connected with an in-pipe phase separator 932, a partition 933 taking an inner cavity axis as an axis is arranged in an inner cavity of the in-pipe phase separator 932, two end lines of the partition 933 are in sealing fit with the surface of the inner cavity of the in-pipe phase separator 932, the inner cavity of the in-pipe phase separator 932 is divided into two parts of inner cavities, one part of the inner cavities is connected with a steam distributor 94 and can directly inject steam into an oil layer, and the other part of the inner cavities is connected with a steam injection branch pipe 934 and introduces the steam into the next oil layer. The inner cavity of the rectifier 931 is provided with a rotational flow sheet which is spirally distributed; the inner cavity of the steam distributor is provided with a conical diffusion surface.
A method for performing sand control and steam injection using an integrated sand control and steam injection device will be described below with reference to fig. 1 to 5, which includes the steps of:
the method comprises the following steps: chemical sand control is filled in the ground.
Firstly, putting a sand injection pipe column, and uniformly adding high-temperature precoated sand into an oil layer;
after sand injection, directly replacing oil field water underground through a sand injection pipe column, completely replacing high-temperature precoated sand in the pipe column with the sand injection pipe column, lifting the sand injection pipe column, closing the well and waiting for setting;
a drilling plug pipe column is put in, a plug is drilled, the well is back-washed until liquid is discharged completely, and the drilling plug pipe column is taken out;
and finally, putting the pipe scraping pipe column, performing well drifting and casing testing, pipe scraping and well washing until liquid is completely discharged, and taking out the pipe scraping pipe column.
Step two: and assembling, putting in a sand prevention and steam injection integrated device.
Selecting the same number of sand-proof steam injection units 9 according to the number of layers of the steam injection oil layer required;
according to the structure shown in figure 1, the sand control and steam injection integrated device is connected and fixed, and a plurality of sand control steam injection units 9 are connected through long-acting steam drive sealers 4;
after the device is assembled, the sand control and steam injection integrated device is put into the underground, so that the position of the sand control steam injection unit 9 corresponds to the position of an oil layer needing steam injection.
Step three: and injecting nitrogen into the annular space.
Nitrogen is injected into the oil sleeve annulus through the sleeve valve, annular liquid is displaced out of the oil sleeve annulus, and the heat insulation effect is further improved while the scale formation of tools is reduced.
Step four: steam is injected in layers with equal dryness.
Connect ground steam injection pipeline, blow-in steam injection, steam gets into sand control, notes vapour integrated device by ground steam transmission pipeline, and long-term steam drives sealer 4 and expands gradually along with annotating the temperature rising of steam pipe post and seal, and then realizes oil reservoir interval packing and separate sealedly, realizes through steam distributor 93 that steam quality distribution equals, further carries out steam injection through steam injection allocation ware to corresponding oil reservoir to realize the dry degree layering sand control steam injection such as single tube.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, but other equivalents may be used without departing from the spirit and scope of the invention.
Claims (6)
1. Sand control, notes vapour integrated device, its characterized in that: the integrated device is formed by sequentially connecting a first heat-insulating oil pipe, a heat-insulating underground compensator, a second heat-insulating oil pipe, a steam injection check valve, a packing device, an insertion pipe sealing device and at least one sand-preventing steam injection unit, wherein the sand-preventing steam injection unit comprises a duplex joint, an outer sand-preventing device and an inner steam-injecting device, the inner steam-injecting device is positioned in an inner cavity of the outer sand-preventing device, the outer sand-preventing device is connected with an external thread at the lower end part of the duplex joint, and the outer sand-preventing device is a screen type sand filtering pipe; the inner steam injection device is formed by sequentially connecting a steam distributor and a steam injection distributor, the upper end part of the steam distributor is connected with the internal thread at the lower end part of the duplex joint, and the lower end part of the steam distributor is connected with the steam injection distributor;
the integrated device comprises a plurality of sand-proof steam injection units, wherein a long-acting steam drive sealer is connected between every two adjacent sand-proof steam injection units to separate and seal different oil layers; the packer is a steam drive packer; the integrated device also comprises a safety joint, one end of the safety joint is connected with the cannula sealing device, and the other end of the safety joint is connected with the duplex joint; the second heat insulation oil pipe is connected with the steam injection check valve through a long-acting steam drive sealer;
the steam distributor is formed by connecting a rectifier, an in-pipe phase separation device and a steam injection branch pipe; the inner cavity of the in-pipe separating device is provided with a partition plate taking the axis of the inner cavity as an axis, the two end lines of the partition plate are in sealing fit with the inner cavity of the in-pipe separating device, the inner cavity of the in-pipe separating device is divided into two parts of inner cavities, one part of the inner cavities are communicated with the steam distributor and can directly inject steam into an oil layer, and the other part of the inner cavities are connected with the steam injection branch pipe and introduce the steam into the next oil layer;
the inner cavity of the rectifier is provided with a rotational flow sheet which is spirally distributed; the inner cavity of the steam injection distributor is provided with a conical diffusion surface.
2. The sand control, steam injection integrated device of claim 1, wherein: the heat-insulation underground compensator comprises an inner sliding pipe and a first sealing chamber sleeved on the outer side of the inner sliding pipe, wherein a first sealing assembly is arranged between the inner sliding pipe and the first sealing chamber, and the upper end of the first sealing chamber is also provided with a first pressing cap for improving the sealing effect of the first sealing chamber; the heat-insulation underground compensator further comprises a heat-insulation outer pipe connected with the lower end of the first sealing chamber, and the two ends of the heat-insulation underground compensator are provided with buckle changing connectors.
3. The sand control, steam injection integrated device of claim 1, wherein: the long-acting steam-driven sealer comprises a hollow central pipe, wherein a sealing part is arranged on the outer wall of the central pipe, thermosensitive bimetal is arranged on the outer wall of the sealing part in an enclosing manner, and a high-temperature-resistant rubber barrel is arranged on the outer wall of the thermosensitive bimetal in an enclosing manner.
4. The sand control and steam injection integrated device as claimed in claim 3, wherein the sealing component comprises a second sealing chamber, a second sealing assembly and a second pressing cap, the second sealing chamber is sleeved on the outer wall of the central tube, the second sealing assembly is arranged between the central tube and the second sealing chamber, and the upper end of the second sealing assembly is fixed by the second pressing cap.
5. The sand control, steam injection integrated device of claim 3, wherein: the upper end and the lower end of the high-temperature resistant rubber cylinder are respectively provided with an upper baffle ring and a lower baffle ring, the lower end part of the lower baffle ring is provided with a pin, and the lower baffle ring, the second sealing chamber and the central pipe are connected together through the pin; and anti-collision rings are arranged below the lower retaining ring and on the outer wall of the central tube.
6. A method for sand control and steam injection using the sand control and steam injection integrated device of any one of claims 1 to 5, comprising the steps of:
the method comprises the following steps: chemical sand control is filled in the ground;
firstly, putting a sand injection pipe column, and uniformly adding high-temperature precoated sand into an oil layer;
after sand injection, directly replacing oil field water underground through a sand injection pipe column, completely replacing high-temperature precoated sand in the pipe column with the sand injection pipe column, lifting the sand injection pipe column, closing the well and waiting for setting;
a drilling plug pipe column is put in, a plug is drilled, the well is back-washed until liquid is discharged completely, and the drilling plug pipe column is taken out;
finally, a pipe scraping pipe column is put in, well drifting and casing checking, pipe scraping and well washing are carried out until liquid is discharged completely, and the pipe scraping pipe column is lifted out;
step two: assembling and putting the sand prevention and steam injection integrated device;
selecting the same number of sand-proof steam injection units according to the number of layers of the steam injection oil layer required;
connecting and fixing the sand prevention and steam injection integrated device, and connecting a plurality of sand prevention and steam injection units through a long-acting steam drive sealer;
after the device is assembled, the sand prevention and steam injection integrated device is put into the underground, so that the position of the sand prevention steam injection unit corresponds to the position of an oil layer needing steam injection;
step three: injecting nitrogen into the annulus;
nitrogen is injected into the oil sleeve annulus through a sleeve valve, and annular liquid is replaced out of the oil sleeve annulus, so that the scaling of a tool is reduced, and the heat insulation effect is further improved;
step four: steam injection with equal dryness in layers;
the steam injection pipe line is connected with the ground, the furnace is opened for steam injection, steam enters the sand control and steam injection integrated device from the ground steam transmission pipe line, the long-acting steam drive sealer gradually expands and seals along with the temperature rise of the steam injection pipe column, so that the sealing and interval sealing of oil layers are realized, the steam dryness distribution is equal through the underground steam distributor, and further the steam injection distributor performs steam injection on the corresponding oil layers, so that the single-pipe equal-dryness layered sand control and steam injection are realized.
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| CN109779588B (en) * | 2017-11-10 | 2023-06-16 | 中国石油化工股份有限公司 | Steam injection, leakage-proof back flushing and production integrated tubular column for thermal production well |
| CN110107270B (en) * | 2018-02-01 | 2021-08-27 | 中国石油化工股份有限公司 | Single-point layered steam injection method for general sand control well |
| CN108386174B (en) * | 2018-03-14 | 2020-11-03 | 西南石油大学 | SAGD horizontal well uniform steam injection pipe column and process |
| CN110608023B (en) * | 2018-06-15 | 2021-12-10 | 中国石油化工股份有限公司 | Adaptability boundary analysis and evaluation method for stratified steam injection of thickened oil |
| CN111219171A (en) * | 2018-11-27 | 2020-06-02 | 中国石油化工股份有限公司 | High-strength filling sand prevention process method for multi-turn steam injection well |
| CN111472737B (en) * | 2019-01-24 | 2024-06-18 | 中国石油化工股份有限公司 | Layered steam injection pipe column and method for layered filling sand control well |
| CN110939420A (en) * | 2019-12-31 | 2020-03-31 | 克拉玛依联科节能环保技术有限公司 | Thick oil thermal recovery layering injection and recovery integrated pipe column tool |
| CN111364956A (en) * | 2020-03-18 | 2020-07-03 | 中国海洋石油集团有限公司 | Sand control injection allocation integrated packer |
| CN114251077B (en) * | 2022-03-01 | 2022-04-29 | 中国石油大学胜利学院 | Double packer steam injection integrated device and method for oil field thick oil exploitation |
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