CN111472737A - Layered steam injection pipe column and method for layered filling sand control well - Google Patents
Layered steam injection pipe column and method for layered filling sand control well Download PDFInfo
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- CN111472737A CN111472737A CN201910070386.6A CN201910070386A CN111472737A CN 111472737 A CN111472737 A CN 111472737A CN 201910070386 A CN201910070386 A CN 201910070386A CN 111472737 A CN111472737 A CN 111472737A
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- 238000010793 Steam injection (oil industry) Methods 0.000 title claims abstract description 178
- 239000004576 sand Substances 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims description 14
- 238000007789 sealing Methods 0.000 claims abstract description 61
- 239000010410 layer Substances 0.000 claims abstract description 52
- 230000002265 prevention Effects 0.000 claims abstract description 34
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- 239000011229 interlayer Substances 0.000 claims abstract description 16
- 238000000429 assembly Methods 0.000 claims abstract description 5
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- 230000001681 protective effect Effects 0.000 claims description 10
- 210000000078 claw Anatomy 0.000 claims description 8
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- 238000010276 construction Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000005304 joining Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 17
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- 230000000903 blocking effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
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Abstract
The invention discloses a layered steam injection pipe column for a layered filling sand prevention well, which comprises an external pipe column and an internal pipe column, wherein the external pipe column comprises a well remaining pipe column, a top packer, a layered filling sand prevention pipe column and an interlayer packer, the internal pipe column comprises a compensator and layered steam injection pipe columns, the number of the set layered steam injection pipe columns is consistent with the number of the set layered filling sand prevention pipe columns, the layered steam injection pipe columns are sequentially connected in series, the uppermost layered steam injection pipe column is connected with the compensator, and the layered steam injection pipe columns comprise steam injection sealing assemblies, positioning pipes and a gas injection device. The invention realizes the layered steam injection of more than two layers by using one string in the layered filling sand control well-reserving string, and the target layer independently seals the steam injection, thereby ensuring the dryness and the air suction amount of the steam injection and improving the steam injection exploitation effect of the sand control well.
Description
Technical Field
The invention relates to the technical field of layered steam injection in oil exploitation, in particular to a layered steam injection pipe column and a method for a layered filling sand control well.
Background
In loose sandstone reservoir heterogeneous multilayer well, adopt the layering to fill the balanced of sand control realization each layer and use, nevertheless in heavy oil well at present, because the tubular column stays the well latus rectum less behind the layering filling sand control, can't adopt the layering of conventional no sand control to stay the well tubular column and annotate vapour tubular column and instrument, mainly adopt the general steam injection of whole layer section at present, because the difference between the layers is big, lead to each layer to breathe in unevenly, influence the steam injection exploitation effect of layering sand control well.
Chinese patent, application date 2015.05.12, application number 201510239809.4, patent name "an integrated injection allocation device for a layered sand control well"; chinese patent, application No. 2016.06.30, application No. 201620671520.X, patent name "a layered steam injection and layered injection distribution column". The two patent applications actually disclose a technology, which discloses a layered steam injection method capable of realizing layered sand control in a well, wherein an integrated layered injection allocation tubular column is inserted into the interior of a layered sand control release tubular column, integrated injection allocation is carried out on the upper part of the release, and each layer is divided into different flow channels through a flow dividing channel. However, the technique has the following technical problems: the injection allocation core is provided with an upper water nozzle and a lower water nozzle which respectively correspond to the outer ring channel and the inner ring channel, and only two layers of layered steam injection can be realized; and because two layers are injected simultaneously, the steam injection pressure of each layer is different, and the dryness of the injected steam of each layer is different, thereby causing the waste of partial heat energy.
Disclosure of Invention
The invention aims to provide a layered steam injection pipe column and a method for a layered filling sand control well, which realize that more than two layers of layered steam injection is carried out by using a one-time pipe column in the layered filling sand control well-reserving pipe column, a target layer is independently sealed and used for injecting steam, the dryness and the air suction quantity of the injected steam are ensured, and the steam injection exploitation effect of the sand control well is improved.
In order to achieve the above purpose, the invention adopts the following technical scheme that the layered steam injection pipe column for the layered filling sand control well comprises an outer pipe column and an inner pipe column, wherein the inner pipe column is arranged in the outer pipe column, the outer pipe column comprises a well reserving pipe column, a top packer, a layered filling sand control pipe column and an interlayer packer, the top packer and the interlayer packer are collectively called layered packers, at least two groups of layered filling sand control pipe columns are arranged, the layered filling sand control pipe columns are connected with each other by the interlayer packer, the upper end of the uppermost layered filling sand control pipe column is connected with the top packer, the upper end of the top packer is connected with the well reserving pipe column, the layered filling sand control pipe column comprises a positioning filling tool and a sand control pipe, the lower port of the positioning filling tool is connected with the upper port of the sand control pipe, and the inner pipe column comprises a compensator, the group quantity that the steam injection tubular column of layering set up is unanimous with the group quantity that the sand control tubular column was filled in the layering, the steam injection tubular column of layering concatenates in proper order between two liang, and the layering steam injection tubular column connection compensator of the top, the steam injection tubular column of layering includes steam injection seal assembly, registration arm, gas injection device, and the registration arm of every group's layering steam injection tubular column fills the corresponding location of the sand control tubular column with the layering of radial corresponding group and fills the corresponding intercommunication of instrument, the gas injection device of every group's layering steam injection tubular column and the corresponding layering of radial corresponding group fill the corresponding intercommunication of sand control tubular column.
The gas injection device comprises a central tube, a switch sleeve and a spring, wherein the central tube is provided with a radially-communicated gas injection port, the outer wall of the switch sleeve slides on the inner hole wall of the central tube, the switch sleeve axially slides to perform closing and opening actions on the gas injection port, the bottom of the switch sleeve is connected with the spring, and the lower end of the spring is connected to a spring platform arranged on the inner wall of the central tube.
The outer wall of the central pipe is further sleeved with a protective sleeve, an annular space is formed between the inner wall of the protective sleeve and the steam injection port, and an annular space is also formed between the outer wall of the protective sleeve and the inner wall of the sand control pipe.
Two sealing grooves are formed in the inner wall of the central tube and are respectively positioned above and below the steam injection port, and inner sealing rings are arranged in the sealing grooves and are sealed between the outer wall of the switch sleeve and the inner wall of the central tube.
The middle part of the outer wall of the positioning pipe 18 of the uppermost group of the layered steam injection pipe columns is circumferentially provided with a positioning table, the vertical oblique angle between the lower inclined surface of the positioning table and the positioning pipe body is 10-30 degrees, and the vertical oblique angle between the upper inclined surface of the positioning table and the positioning pipe body is 80-90 degrees.
The compensator comprises a compensation outer pipe and a compensation inner pipe which are sleeved together and can axially slide relatively, an inner ring platform, namely a lower boss, is arranged on the inner wall of a lower port of the compensation outer pipe, an outer ring platform, namely an upper boss, is arranged on the outer wall of an upper port of the compensation inner pipe, the outer diameter of the outer ring platform is larger than the inner diameter of the inner ring platform, namely, the lower end face of the outer ring platform and the upper end face of the inner ring platform form an axial limiting structure.
And a sealing groove is formed in the inner wall of the inner ring platform, and a high-temperature sealing ring is arranged in the sealing groove and forms a sealing surface with the outer wall of the compensation inner pipe.
Annotate sealed assembly of vapour and include top connection, lower clutch, the top connection lower extreme is connected with the lower clutch upper end screw thread formula, and the location platform is still seted up to top connection lower extreme outer wall, constitute the anticreep space between lower clutch up end and the location platform, anticreep space installation anticreep high temperature sealing member, anticreep high temperature sealing member are compressed tightly by lower clutch and location platform, anticreep high temperature sealing member outer wall is encapsulated situation with layering packer inner wall.
And the inner wall of the top packer is also provided with a limiting reducing table for preventing the lower joint from axially falling.
In order to achieve the purpose, the invention adopts the following technical scheme that the layered steam injection method for the layered filling sand control well comprises the following steps:
a. the layered steam injection pipe column is lowered to the designed position in the layered filling well-remaining pipe column;
b. the movable pipe column realizes the positioning of the positioning pipe and the positioning and filling tool elastic beam claw of the separate-layer filling sand-prevention well-leaving pipe column;
c. injecting steam into an oil pipe according to the lower-layer injection allocation requirement, wherein the steam descends from a steam injection pipe column, the pipe column is thermally extended under the action of steam heat, an outer inclined plane in the middle of a lower joint of a first steam injection sealing assembly moves downwards to a limiting inclined plane in a top packer for filling a sand prevention and retention well pipe column in a layered mode to prevent the pipe column from moving downwards, telescopic compensation is carried out on the inner pipe and the outer pipe of a compensator in a relative motion mode, the steam pushes a steel ball compression spring preset in a bottom steam injection device, a switch sleeve moves downwards, and due to the fact that annular space sealing is carried out between the bottom sealing assembly and the interlayer packer for filling the sand prevention and retention well pipe column, the steam can only enter a bottom oil layer through a second sand;
c. putting a steel ball into the oil pipe, pressurizing, pushing a switch sleeve in the first steam injection device by steam to compress a spring, exposing a steam injection port of a central pipe of the steam injection device, opening a channel at the upper part of steam injection, and closing a channel at the bottom part of steam injection because the steam injection device at the bottom part is not subjected to steam pressure any more;
d. according to the upper layer and joining in marriage notes demand and pour steam into to oil pipe into, steam is down from annotating the steam pipe post, because the annular space is sealed about going on respectively with top packer and the layer packer that fills sand control and stay the well tubular column, steam can only get into the upper portion oil reservoir through the sand control pipe through annotating the steam port on the steam injection device center tube, realizes that the upper strata annotates vapour.
If more than two sand control layers need to be injected with steam, only corresponding positioning pipes, steam injection sealing assemblies and steam injection devices need to be added, and the steam injection construction of the middle layer is carried out by repeating the steps c and d; and (5) providing a layered steam injection pipe column for production and oil extraction.
Compared with the prior art, the invention has the following beneficial effects:
in the process of putting the layered steam injection pipe column into the well, the lower inclined plane of the middle positioning table of the positioning pipe and the vertical inclined angle of the pipe body are 10-30 degrees, so that the upper inclined plane of the elastic beam claw of the positioning and filling tool in the layered filling sand prevention well-reserved pipe column can smoothly pass through, the pipe column is lifted up after the pipe column is put to a designed position, and the upper inclined plane of the positioning table of the positioning pipe and the vertical inclined angle of the pipe body are 80-90 degrees, so that when the lower inclined plane of the elastic beam claw of the positioning and filling tool in the layered filling sand prevention well-reserved pipe column is contacted.
In the steam injection process, the integral pipe column is heated and extended, the inner pipe and the outer pipe of the compensator move relatively to perform telescopic compensation, and meanwhile, the outer inclined plane in the middle of the lower joint of the first steam injection sealing assembly moves downwards to the limiting inclined plane in the top packer of the layered filling sand prevention well-reserving pipe column, so that the pipe column is prevented from moving downwards. The spring in the steam injection device is compressed under the pressure of injected steam, the switch sleeve moves downwards to expose the steam injection port, steam enters the layered filling sand prevention well-reserving pipe column through the steam injection port of the steam injection device and is annularly empty with the layered steam injection pipe column, and because the steam injection sealing assembly and the interlayer packer and the top packer of the layered filling sand prevention well-reserving pipe column form reliable sealing, the steam can only enter a target oil layer through the sand prevention pipe.
When steam is injected, a switch sleeve in the steam injection device compresses a spring to move downwards, a steam injection port on a central pipe is exposed, a steam injection channel is opened, and when the steam injection is finished or the steam injection at a corresponding layer is stopped, the spring pushes the switch sleeve to recover the original position, the steam injection channel is closed, and the backflow of injected steam is prevented from dragging and filling gravel or stratum sand; the switch sleeve is connected with the central pipe in a fixed inner sealing mode, and therefore the phenomenon that when steam injection pressure fluctuation is large or a steam injection channel needs to be opened and closed for multiple times, the spring stretches repeatedly to drive the switch sleeve to slide downwards to pass through a steam injection port, a sealing ring is scratched, and sealing effect is caused is effectively avoided.
The primary pipe column is provided with corresponding steam injection sealing assemblies and steam injection devices aiming at each sand prevention layer, and can realize the layered steam injection of the layered filling sand prevention well which is larger than two layers. Meanwhile, the design of the switchable steam injection device can effectively prevent the stratum sand from moving and the filling sand from flowing back and spitting, and protect the stability of the sand-proof filling layer; the interlayer adopts an anti-drop sealing structure, is safe and reliable, and can independently inject steam into the steam injection target layer without being influenced by the difference of steam injection pressure, thereby ensuring the steam injection dryness and the air suction quantity of each layer, saving the steam injection cost and improving the layered sand control steam injection exploitation effect.
Drawings
FIG. 1 is a schematic structural view of a layered steam injection pipe column of the layered filling sand control well according to the present invention;
FIG. 2 is a schematic view of the positioning of the layered steam injection string during lowering;
FIG. 3 is a schematic view of a lower steam injection passage;
fig. 4 is a schematic view of an upper steam injection passage.
In the figure: a layering sand control well-reserving pipe column 1; a top packer 2; positioning the filling tool 3; a first sand control pipe 4; an interlayer packer 5; a second sand control pipe 6; a layered gas injection pipe column 7; a compensator 8; an upper boss 9; a compensating outer tube 10; a lower boss 11; a high-temperature seal ring 12; the compensation inner pipe 13; a first steam injection seal assembly 14; an upper joint 15; a run-off resistant high temperature seal 16; a lower joint 17; a positioning tube 18; a first steam injection device 19; a center tube 20; a steam injection port 21; a switch cover 22; an inner seal ring 23; a protective sleeve 24; a spring 25.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 4, the present invention provides a technical solution: a layered steam injection pipe column for a layered filling sand control well comprises a layered sand control well retaining pipe column (known technology) and a layered steam injection pipe column. The layered sand control well-reserving pipe column (taking two layers as an example) comprises a top packer, a first positioning filling tool, a first sand control pipe, an interlayer packer, a second positioning filling tool and a second sand control pipe which are sequentially connected from top to bottom; the layered steam injection pipe column (taking two layers as an example) comprises a compensator, a first steam injection sealing assembly, a first positioning pipe, a first steam injection device, a bottom steam injection sealing assembly and a bottom steam injection device which are sequentially connected from top to bottom.
Referring to fig. 1, taking two layers as an example, when more layers of steam injection are required to be implemented in a filling sand-prevention well-reserving pipe column with more layers, the corresponding positioning pipe, the steam injection sealing assembly and the steam injection device are added. The length of each layer is adjusted by using the oil pipe according to the length requirement of the filling sand-prevention well-remaining pipe column, so that the positioning table on the positioning pipe corresponds to the position of the elastic beam claw on each layer of positioning filling tools in the sand-prevention well-remaining pipe column.
The compensator 8 is positioned at the uppermost end of the layered steam injection pipe column and consists of an outer compensation pipe 10 and an inner compensation pipe 13, the upper end of the outer compensation pipe 10 is connected with an oil pipe from the ground, the inner surface of the outer compensation pipe is a smooth sealing surface, the lower end of the outer compensation pipe is provided with an inward lower boss 11, and the lower boss 11 is provided with a high-temperature sealing ring 13; the upper end of the compensation inner pipe 13 is provided with an outward upper boss 9, the outer surface is a smooth sealing surface, a lower boss 11 of the compensation outer pipe 10 slides on the outer sealing surface below the upper boss 9 of the compensation inner pipe 13, the upper boss 9 of the compensation inner pipe 13 slides on the inner sealing surface above the lower boss 11 of the compensation outer pipe 10, and the compensation outer pipe 10 and the compensation inner pipe 13 are connected in a sliding and sealing mode.
The first steam injection sealing assembly 14 is composed of an upper joint 15 and a lower joint 17, the middle part outside the upper joint 15 is provided with the upper half part of a groove which is open at the lower part and is narrow at the outer part and wide at the inner part, the middle part of the lower joint 17 is provided with an outer inclined plane, the head part of the lower joint 17 is the lower half part of the groove which is symmetrical to the groove of the upper joint 15 and is narrow at the outer part and wide at the inner part, when the external thread at the lower part of the upper joint 15 is connected with the external thread at the upper part of the lower joint 17, a complete sealing groove which is narrow at the outer part and wide at the inner part is formed, the sealing ring is effectively prevented from falling off, and the outer edge sealing surface. The anti-drop high-temperature sealing element 16 is in a horizontal trapezoidal shape, a convex shape and other shapes with narrow outside and wide inside and anti-drop shapes, and is made of high-temperature resistant materials such as carbon fibers.
The middle part of the positioning pipe 18 of the uppermost group of the layered steam injection pipe columns is circumferentially provided with a positioning table, the vertical oblique angle between the lower inclined plane of the positioning table and the pipe body of the positioning pipe is 10-30 degrees, and the vertical oblique angle between the upper inclined plane of the positioning table and the pipe body is 80-90 degrees.
The first steam injection device 19 is composed of a central pipe 20, a protective sleeve 24, a switch sleeve 22 and a spring 25, wherein steam injection ports 21 are uniformly distributed in the middle of the central pipe 20, the protective sleeve 24 is arranged outside the steam injection ports 21, the protective sleeve 24 is in threaded connection with the central pipe 20, the switch sleeve 22 is arranged inside the steam injection ports 21, an inner inclined plane with a large upper part and a small lower part is arranged in the switch sleeve 22 from the top, the switch sleeve 22 is connected with the central pipe 20 through a fixed inner seal 23, a blocking platform is arranged on the lower part of the central pipe 20, and the spring 25 is arranged between the blocking platform and the bottom of the switch sleeve 22.
In the process of putting the layered steam injection pipe column 7 into the well, the lower inclined plane of the middle positioning table of the positioning pipe 18 and the vertical inclined plane of the pipe body form 10-30 degrees, the layered steam injection pipe column can smoothly pass through the upper inclined plane of the elastic beam claw of the positioning filling tool 3 in the layered filling sand prevention well-reserved pipe column 1, the pipe column is lifted up after the pipe column is put to a designed position, and the upper inclined plane of the positioning table of the positioning pipe 18 and the vertical inclined plane of the pipe body form 80-90 degrees, when the lower inclined plane of the elastic beam claw of the positioning filling tool 3 in the layered filling sand prevention well-reserved pipe column 1 is contacted, the angle is larger.
In the steam injection process, the integral pipe column is heated and extended, the inner pipe and the outer pipe of the compensator 8 move relatively to perform telescopic compensation, meanwhile, the outer inclined plane in the middle of the lower connector 17 of the first steam injection sealing assembly 14 moves downwards to the limiting inclined plane inside the top packer 2 of the layered filling sand prevention well-remaining pipe column 1, so that the pipe column is prevented from moving downwards, and the position is shown in fig. 3. The spring 25 in the steam injection device 19 is compressed under the pressure of injected steam, the switch sleeve 22 is moved downwards to expose the steam injection port 21, the steam enters the layered filling sand prevention well-reserving pipe column 1 and the layered steam injection pipe column 7 through the steam injection port 21 of the steam injection device 19 to be annularly emptied, and because the steam injection sealing assembly 17 and the top packer 2 and the interlayer packer 5 of the layered filling sand prevention well-reserving pipe column 1 form reliable sealing, the steam can only enter a target oil layer through the sand prevention pipe.
When steam is injected, the switch sleeve 22 in the steam injection device 19 compresses the spring 25 to move downwards, the steam injection port 21 on the central pipe 20 is exposed, the steam injection channel is opened, when the steam injection is finished or the steam injection at the corresponding position is stopped, the spring 25 pushes the switch sleeve 22 to recover the original position, the steam injection channel is closed, and the backflow of the injected steam is prevented from dragging and filling gravel or stratum sand; the switch sleeve 22 is connected with the central pipe 20 through the fixed inner seal 23, so that the phenomenon that the seal ring is scratched to cause sealing failure due to the fact that the switch sleeve 22 is driven by repeated expansion and contraction of the spring 25 to slide up and down to pass through the steam injection port 21 when steam injection pressure fluctuation is large or a steam injection channel needs to be opened and closed for multiple times is effectively avoided.
The separate-layer filling sand-proof well-leaving pipe column is a known technology.
The layered steam injection method for the layered filling sand control well comprises the following steps:
a. the layered steam injection pipe column is lowered to the designed position in the layered filling well-left pipe column, as shown in figure 1;
b. the movable pipe column realizes the positioning of the positioning pipe and the elastic beam claw of the positioning and filling tool of the separate-layer filling sand-prevention well-leaving pipe column, as shown in figure 2.
c. Injecting steam into an oil pipe according to the lower-layer injection allocation requirement, wherein the steam descends from a steam injection pipe column, the pipe column is thermally extended under the action of steam heat, an outer inclined plane in the middle of a lower joint of a first steam injection sealing assembly moves downwards to a limiting inclined plane in a top packer for filling a sand prevention and retention well in a layered mode to prevent the pipe column from moving downwards, telescopic compensation is carried out on the inner pipe and the outer pipe of a compensator in a relative motion mode, the steam pushes a steel ball compression spring preset in a bottom steam injection device, a switch sleeve moves downwards, annular sealing is carried out on the bottom sealing assembly and an interlayer packer for filling the sand prevention and retention well pipe column, and the steam can only enter a bottom oil layer through a second sand prevention pipe through a bottom steam injection port to realize bottom steam injection;
c. putting a steel ball into the oil pipe, pressurizing, pushing a switch sleeve in the first steam injection device by steam to compress a spring, exposing a steam injection port of a central pipe of the steam injection device, opening a channel at the upper part of steam injection, and closing a channel at the bottom part of steam injection because the steam injection device at the bottom part is not subjected to steam pressure any more;
d. steam is injected into the oil pipe according to the upper-layer injection allocation requirement, the steam goes downwards from the interior of the steam injection pipe column, the upper annular seal and the lower annular seal are respectively carried out on the top packer and the interlayer packer of the upper-layer sealing assembly, the steam can only enter an upper oil layer through the sand prevention pipe through a steam injection port on a central pipe of the steam injection device, and the upper-layer steam injection is realized, and the structure is shown in figure 4.
And (d) if more than two sand control layers need to be injected with steam, only corresponding positioning pipes, steam injection sealing assemblies and steam injection devices need to be added, and the steps c and d are repeated to perform steam injection construction of the middle layer.
e. And (5) providing a layered steam injection pipe column for production and oil extraction.
In the description of the present invention, it is to be understood that the positional indications or positional relationships are based on those shown in the drawings and are for the purpose of facilitating the description of the present invention, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (11)
1. A layered steam injection pipe column for a layered filling sand prevention well comprises an external pipe column and an internal pipe column, wherein the internal pipe column is arranged in the external pipe column, the external pipe column comprises a well leaving pipe column, a top packer, a layered filling sand prevention pipe column and an interlayer packer, the top packer and the interlayer packer are all commonly called layered packers, the layered filling sand prevention pipe column is at least arranged in two groups, the layered filling sand prevention pipe columns are connected with each other by the interlayer packer, the upper end of the uppermost layered filling sand prevention pipe column is connected with the top packer, the upper end of the top packer is connected with the well leaving pipe column, the layered filling sand prevention pipe column comprises a positioning filling tool and a sand prevention pipe, a port thread sand prevention buckle type is connected with the upper port of the sand prevention pipe under the positioning filling tool, the internal pipe column comprises a compensator and a layered gas injection pipe column, the group number of the layered steam injection pipe column is consistent with the, the steam injection pipe column of each group of the layered steam injection pipe columns is correspondingly positioned with a positioning filling tool of a radial corresponding group of the layered filling sand control pipe column, and the gas injection device of each group of the layered steam injection pipe columns is correspondingly communicated with a sand control pipe of a radial corresponding group of the layered filling sand control pipe column.
2. The layered steam injection pipe column for the layered filling sand control well according to claim 1, wherein the gas injection device comprises a central pipe, a switch sleeve and a spring, the central pipe is provided with a steam injection port which is radially communicated, the outer wall of the switch sleeve slides on the inner wall of the central pipe, the switch sleeve slides axially to close and open the steam injection port, the bottom of the switch sleeve is connected with the spring, and the lower end of the spring is connected to a spring platform which is arranged on the inner wall of the central pipe.
3. The layered steam injection string for layered filling of sand control wells according to claim 2, wherein the outer wall of the central tube is further sleeved with a protective jacket, wherein an annular space is formed between the inner wall of the protective jacket and the steam injection port, and an annular space is also formed between the outer wall of the protective jacket and the inner wall of the sand control tube.
4. The layered steam injection pipe column for the layered filling sand control well according to claim 2, wherein the inner wall of the central pipe is provided with two sealing grooves respectively positioned above and below the steam injection port, and an inner sealing ring is arranged in each sealing groove and sealed between the outer wall of the switch sleeve and the inner wall of the central pipe.
5. The layered steam injection pipe column for the layered filling sand control well according to the claim 1, 2, 3 or 4, characterized in that the middle part of the outer wall of the positioning pipe 18 of the uppermost group of layered steam injection pipe columns is circumferentially provided with a positioning table, the vertical oblique angle between the lower oblique surface of the positioning table and the positioning pipe body is 10-30 degrees, and the vertical oblique angle between the upper oblique surface of the positioning table and the positioning pipe body is 80-90 degrees.
6. The layered steam injection pipe column for the layered filling sand control well according to the claim 1, 2, 3 or 4, wherein the compensator comprises an outer compensation pipe and an inner compensation pipe which are sleeved together and can slide relatively to the axial direction, the inner wall of the lower port of the outer compensation pipe is provided with an inner ring platform, namely a lower boss, the outer wall of the upper port of the inner compensation pipe is provided with an outer ring platform, namely an upper boss, the outer diameter of the outer ring platform is larger than the inner diameter of the inner ring platform, namely the lower end surface of the outer ring platform and the upper end surface of the inner ring platform form an axial limiting structure.
7. The layered steam injection pipe column for the layered filling sand control well according to claim 6, wherein a sealing groove is formed in the inner wall of the inner annular platform, and a high-temperature sealing ring is arranged in the sealing groove and forms a sealing surface with the outer wall of the compensation inner pipe.
8. The layered steam injection pipe column for the layered filling sand control well according to the claim 1, 2, 3, 4 or 7, wherein the steam injection sealing assembly comprises an upper joint and a lower joint, the lower end of the upper joint is in threaded connection with the upper end of the lower joint, the outer wall of the lower end of the upper joint is further provided with a positioning table, an anti-falling space is formed between the upper end surface of the lower joint and the positioning table, an anti-falling high-temperature sealing element is installed in the anti-falling space and is tightly pressed by the lower joint and the positioning table, and the outer wall of the anti-falling high-temperature sealing element and the inner wall of the layered packer are in a sealing state.
9. The zonal steam injection string for zonal filling of the sand control well according to claim 8, wherein the inner wall of the top packer is further provided with a limiting reducing table for preventing the lower joint from axially falling.
10. A layered steam injection method for a layered filling sand control well is characterized by comprising the following steps:
a. the layered steam injection pipe column is lowered to the designed position in the layered filling well-remaining pipe column;
b. the movable pipe column realizes the positioning of the positioning pipe and the positioning and filling tool elastic beam claw of the separate-layer filling sand-prevention well-leaving pipe column;
c. injecting steam into an oil pipe according to the lower-layer injection allocation requirement, wherein the steam descends from a steam injection pipe column, the pipe column is thermally extended under the action of steam heat, an outer inclined plane in the middle of a lower joint of a first steam injection sealing assembly moves downwards to a limiting inclined plane in a top packer for filling a sand prevention and retention well pipe column in a layered mode to prevent the pipe column from moving downwards, telescopic compensation is carried out on the inner pipe and the outer pipe of a compensator in a relative motion mode, the steam pushes a steel ball compression spring preset in a bottom steam injection device, a switch sleeve moves downwards, and due to the fact that annular space sealing is carried out between the bottom sealing assembly and the interlayer packer for filling the sand prevention and retention well pipe column, the steam can only enter a bottom oil layer through a second sand;
c. putting a steel ball into the oil pipe, pressurizing, pushing a switch sleeve in the first steam injection device by steam to compress a spring, exposing a steam injection port of a central pipe of the steam injection device, opening a channel at the upper part of steam injection, and closing a channel at the bottom part of steam injection because the steam injection device at the bottom part is not subjected to steam pressure any more;
d. according to the upper layer and joining in marriage notes demand and pour steam into to oil pipe into, steam is down from annotating the steam pipe post, because the annular space is sealed about going on respectively with top packer and the layer packer that fills sand control and stay the well tubular column, steam can only get into the upper portion oil reservoir through the sand control pipe through annotating the steam port on the steam injection device center tube, realizes that the upper strata annotates vapour.
11. The layered steam injection method for the layered filling sand control well according to the claim 10, characterized in that if more than two sand control layers need to be injected with steam, only corresponding positioning pipes, steam injection sealing assemblies and steam injection devices need to be added, and the steam injection construction of the middle layer is carried out by repeating the steps c and d; and (5) providing a layered steam injection pipe column for production and oil extraction.
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