CN108691511B - Packing upper-layer and lower-layer integrated sand prevention pipe column and method - Google Patents

Packing upper-layer and lower-layer integrated sand prevention pipe column and method Download PDF

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Publication number
CN108691511B
CN108691511B CN201710218884.1A CN201710218884A CN108691511B CN 108691511 B CN108691511 B CN 108691511B CN 201710218884 A CN201710218884 A CN 201710218884A CN 108691511 B CN108691511 B CN 108691511B
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China
Prior art keywords
pipe
joint
oil pipe
channel
packer
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CN108691511A (en
Inventor
李文波
高生伟
张德杰
郑家丰
徐广东
邵朋
王卫星
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China Petroleum and Chemical Corp
Sinopec Research Institute of Petroleum Engineering Shengli Co
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China Petroleum and Chemical Corp
Sinopec Research Institute of Petroleum Engineering Shengli Co
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/18—Pipes provided with plural fluid passages
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/12—Packers; Plugs
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02—Subsoil filtering
    • E21B43/04—Gravelling of wells
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02—Subsoil filtering
    • E21B43/08—Screens or liners

Abstract

The invention discloses a packing upper layer and lower layer integrated sand control pipe column and a method. The upper oil layer is sealed by the aid of the multichannel packer and the rubber sleeve of the sand prevention filling tool, filling sand prevention construction is achieved through the double channels formed by the multichannel packer, the oil pipes with two different diameters, the channel converter and the sand prevention filling tool, the process technology that the upper layer is sealed and the lower layer is filled with sand prevention while one-time tubular column is put into a well is achieved, the construction process is greatly simplified, and the operation cost is reduced.

Description

Packing upper-layer and lower-layer integrated sand prevention pipe column and method
Technical Field
The invention relates to a workover tool for oil and water well operation in an oil field, in particular to a packing upper-layer and lower-layer integrated sand control pipe column and a method.
Background
At present, a victory oil field enters a middle and later development stage, along with the technical progress of oil deposit fine description and the like, most of old oil wells are subjected to repeated perforation for many times, one well has multiple layers, which is the current situation of the old oil field, although layering and fine-layering mining are carried out, because the oil deposit geological conditions of all layer series are different and the mining degrees are different, the interlayer contradiction of the oil wells is continuously intensified, the situation that a high-pressure layer and a low-pressure layer exist in the same well at the same time is common, the situation inevitably leads to the increase of the development difficulty, particularly in an oil well of loose sandstone, after the problem that one well has multiple layers and the interlayer contradiction is prominent, the layering sand control process technology is effectively realized, the layering construction cost is effectively reduced under the current international low oil price situation, and the technique becomes one of the technical problems troubling the site. Particularly, under the condition that a low-pressure layer is arranged at the upper part and a high-pressure layer (required filling layer) is arranged at the lower part in an oil well, how to complete the sand prevention filling construction of the high-pressure layer on the premise of protecting the low-pressure layer at the upper part is a problem which needs to be solved urgently on site. The invention aims to provide a pipe column technology and a method which can protect an upper oil layer in the filling sand prevention construction process and can perform filling sand prevention construction on a lower oil layer.
Through retrieval, application number 201520589859.0 is found, application date 2015.08.07 discloses an integrated construction pipe column for sealing, extracting, screening and sand prevention, wherein an oil pipe, a Y445 type packer, a Y211 type packer, a sand prevention tool capable of being repeatedly filled, an auxiliary tool, a signal screen pipe, a centralizer, a screen pipe, a centralizer and a plug are in threaded connection from top to bottom, the whole pipe column is put into a casing pipe at one time, the blocking and sand prevention are completed at one time, and the sealing of a sealing layer is realized by the combination of the Y445 type packer and the Y211 type packer; the screen pipe filling sand prevention of the production layer is realized by matching the filling tool capable of opening the channel repeatedly with the auxiliary tool. The utility model discloses an utilize packer and can repeatedly open the ingenious cooperation of filling the instrument of filling that fills the passageway, realized that the card seals upper stop layer, screen pipe and fill sand control lower floor's integration construction, solved the difficult problem that many oil reservoirs development oil well card sealed upper strata, screen pipe fill sand control and adopted lower floor betterly, had moreover and simplified the construction, save the time limit for a project, precipitation oil increase effect is showing.
The invention is greatly different from the patents searched above, and the main difference is shown in the invention content. In the prior art, tools need to be released in a well, a filling pipe column with auxiliary tools needs to be put in again during filling construction, sand control construction can be carried out after a filling channel is opened, and the integration expressed by the method is the integration of sand control construction and sealing up and extracting the pipe column instead of the integration of the sand control filling technology. The method is specially directed at the integration of the filling sand prevention technology, after the filling construction is finished, most of pipe columns in the well need to be taken out of the well, and the method is only directed at the technology in the sand prevention construction process; the retrieved prior art disclosed only can exploit the lower layer after the sand control construction is finished, and the two packers are both left in the well, so the method is essentially different from the method.
Disclosure of Invention
The invention aims to provide an integrated sand control pipe column with an upper packing layer and a lower packing layer and a method thereof, wherein a closed circulation channel is established in a casing pipe inner layered packing sand control process. Can realize packing upper portion oil reservoir, can fill sand control construction to the lower part oil reservoir simultaneously.
In order to achieve the purpose, the invention adopts the following technical scheme that the packing upper-layer and lower-layer integrated sand control tubular column comprises an upper oil pipe, a multi-channel packer, a double-layer oil pipe, a channel converter, a sand control packing tool, a sieve pipe and a plug which are sequentially connected from top to bottom, wherein the double-layer oil pipe comprises an outer oil pipe and an inner oil pipe arranged in the outer oil pipe, an oil pipe annulus is formed between the inner oil pipe and the outer oil pipe, a middle channel of the multi-channel packer is communicated with a central cavity of the inner oil pipe, and a side channel of the multi-channel packer is communicated with the oil pipe annulus.
The multi-channel packer comprises a packer, a central pipe, a sliding upper joint and a connecting sleeve, wherein the central pipe is positioned inside the packer, a middle channel is arranged inside the central pipe, a side channel is formed between the central pipe and the packer, the upper end of the packer is connected with the sliding upper joint through the packer upper joint, the lower end of the central pipe is connected with an inner pipe lower joint, and the lower end of the packer sequentially passes through the packer lower joint, the connecting sleeve and an outer pipe lower joint to be connected.
The upper sliding connector and the central pipe form an edge flow passage, the edge flow passage is communicated with the edge channel, the upper sliding connector is provided with a radial hole, the radial hole is communicated with the edge flow passage, and the upper end of the upper sliding connector is connected with an upper oil pipe.
And a side lower flow passage is formed between the outer pipe lower joint and the inner pipe lower joint, the upper end of the side lower flow passage is communicated with the side passage, the lower end of the side lower flow passage is communicated with an oil pipe annulus, the lower end of the inner pipe lower joint is connected with an inner oil pipe through an oil pipe buckle, and the lower end of the outer pipe lower joint is connected with an outer oil pipe through an oil pipe buckle.
And a middle through connecting piece is arranged between the connecting sleeve and the central pipe and is positioned at the upper part of the lower joint of the inner pipe.
The channel converter comprises a converter joint and an oil pipe joint, wherein the oil pipe joint is arranged outside the converter joint, and a conversion channel is formed between the converter joint and the oil pipe joint; the upper end of the adapter joint is connected with an inner oil pipe, and the lower end of the adapter joint is connected with a sand prevention filling tool to form an inner flow channel; the upper end of the oil pipe joint is connected with an outer oil pipe, and the switching channel is communicated with an oil pipe annulus.
And a hollow connecting piece is arranged between the converter joint and the oil pipe joint.
The lower end of the oil pipe joint is connected with a lower sealing sleeve, the lower end of the lower sealing sleeve is sleeved on the upper portion of the sand control filling tool, the O-shaped ring is located on the lower portion of the circulation hole of the sand control filling tool, a liquid flow channel is formed between the lower sealing sleeve and the sand control filling tool, and the liquid flow channel is communicated with the annulus of the oil pipe.
The sand control filling tool is provided with a mortar outlet and a circulation hole which are respectively positioned below and above the rubber cylinder of the sand control filling tool.
In order to achieve the other purpose, the invention adopts the following technical scheme that the integrated sand control method for packing the upper layer and the lower layer is characterized in that after the pipe column is put in place according to the design, the pipe column is lifted up firstly, a hydraulic setting sand control packing tool is added to the oil pipe, the pipe column is lowered down to set a multi-channel packer, the oil pipe continues to add hydraulic pressure until the pressure drops suddenly, when the oil jacket ring goes out of liquid, the circulation channel of the sand control packing tool is opened, then the wellhead is installed, and the sand control construction is started;
after the sand control construction is finished, the pipe column is directly lifted to a certain height, the multi-channel packer is firstly unsealed, a certain tonnage is continuously lifted, the forward transmission pipe column enables the sand control filling tool to be released, the pipe column is continuously lifted until the construction pipe column is completely lifted out of the well, and the construction of the process is finished
Compared with the prior art, the invention has the following beneficial effects:
after the pipe column is lowered into the well, the upper oil layer can be sealed by the primary pipe column, two internal liquid circulation channels are built by the primary pipe column, and the construction of lower-layer sand prevention filling is realized.
In the prior art, tools need to be released in a well, a filling pipe column with auxiliary tools needs to be put in again during filling construction, sand control construction can be carried out after a filling channel is opened, and the integration means is integration of sand control construction and sealing-up and extracting pipe columns instead of integration of sand control filling technology (see patent application No. 201520589859.0). The method is specially directed at the integration of the filling sand prevention technology, after the filling construction is finished, most of pipe columns in the well need to be taken out of the well, and the method is only directed at the technology in the sand prevention construction process; the retrieved prior art disclosed only can exploit the lower layer after the sand control construction is finished, and the two packers are both left in the well, so the method is essentially different from the method.
The invention also has the following beneficial effects: after construction is finished, releasing can be achieved through the sand control filling tool, after releasing, the releasing parts of the oil pipe, the multi-channel packer, the outer oil pipe, the inner oil pipe, the channel converter and the sand control filling tool can be lifted out of a shaft along with the pipe column, and the sand control construction pipe column does not affect subsequent construction operation.
The multi-channel packer, the outer oil pipe, the inner oil pipe, the channel converter and the sand prevention filling tool are connected through threads, and then two liquid channels which are not communicated can be formed.
The structure of the multi-channel packer comprises a sliding upper joint, a central pipe, a packer upper joint, a packer lower joint, a connecting sleeve, an inner pipe lower joint and an outer pipe lower joint, and the structure realizes two internal liquid channels of the multi-channel packer.
The structure of the channel converter consists of a converter joint, an oil pipe joint, a middle connecting piece, a lower sealing sleeve and an O-shaped ring, and the structure realizes two paths of liquid channels inside the channel converter.
Drawings
FIG. 1 is a schematic structural diagram of an integrated sand control tubular column with an upper packing layer and a lower packing layer according to the invention;
FIG. 2 is a schematic diagram of the structure of a multi-channel packer.
Fig. 3 is a schematic diagram of the structure of the channel converter.
In the figure: 1-feeding an oil pipe; 2-a multi-channel packer circulation hole; 3-a multi-channel packer; 4-an outer oil pipe; 5-inner oil pipe; 6-filling the tool circulation holes; a 7-channel converter; 8-sand control packing tool; 9-sieve tube; 10-plug; 11-a sleeve; 12-sliding the upper joint; 13-a central tube; 14-radial holes; 15-packer upper joint; 16-a packer; 17-a packer lower joint; 18-a connecting sleeve; 19-inner tube lower joint; 20-outer pipe lower joint; 21-tubing buckles; 22-tubing string; 23-tubing buckles; 24-a converter junction; 25-tubing joints; 26-a through connector; 27-lower sealing sleeve; 28-tubing buckles; 29-O-ring.
Detailed Description
The detailed description and technical contents of the present invention are described below with reference to the accompanying drawings, which are, however, for reference and illustration purposes only and are not intended to limit the present invention.
As shown in the attached drawings 1 to 3, the integrated sand control pipe column with the packed upper layer and the packed lower layer comprises an upper oil pipe 1, a multi-channel packer 3, a double-layer oil pipe, a channel converter 7, a sand control packing tool 8, a sieve pipe 9 and a plug 10 which are sequentially connected from top to bottom, wherein the double-layer oil pipe comprises an outer oil pipe 4 and an inner oil pipe 5 arranged inside the outer oil pipe, an oil pipe annulus is formed between the inner oil pipe and the outer oil pipe, a middle channel of the multi-channel packer is communicated with a central cavity of the inner oil pipe, and a side channel of the multi-channel packer is communicated with the oil pipe annulus.
The multi-channel packer comprises a packer 16, a center pipe 13, a sliding upper joint 12 and a connecting sleeve 18, wherein the center pipe is positioned inside the packer, a middle channel is arranged inside the center pipe, a side channel is formed between the center pipe and the packer, the upper end of the packer is connected with the sliding upper joint through the packer upper joint 15, the lower end of the center pipe is connected with an inner pipe lower joint 19, and the lower end of the packer sequentially passes through the packer lower joint 17 and the connecting sleeve 18 to be connected with an outer pipe lower joint 20.
The upper sliding joint and the central pipe form an edge flow passage, the edge flow passage is communicated with the edge channel, the upper sliding joint is provided with a radial hole 14, the radial hole is communicated with the edge flow passage, and the upper end of the upper sliding joint is connected with an upper oil pipe.
And a side lower flow passage is formed between the outer pipe lower joint and the inner pipe lower joint, the upper end of the side lower flow passage is communicated with the side passage, the lower end of the side lower flow passage is communicated with an oil pipe annulus, the lower end of the inner pipe lower joint is connected with an inner oil pipe through an oil pipe buckle 22, and the lower end of the outer pipe lower joint is connected with an outer oil pipe through an oil pipe buckle 21. The inner pipe lower joint 19 is respectively connected with the central pipe 13 and the connecting sleeve 18 through threads, and a central through hole is formed in the upper portion of the inner pipe lower joint 19.
The multi-channel packer circulation holes 2 in figure 1 are the radial holes 14 in figure 2.
The channel converter comprises a converter joint 24 and an oil pipe joint 25, the oil pipe joint is arranged outside the converter joint, a conversion channel is formed between the converter joint and the converter joint, the upper end of the converter joint is connected with an inner oil pipe and a lower sand prevention filling tool, the upper end of the oil pipe joint is connected with an outer oil pipe, and the conversion channel is communicated with an oil pipe annulus. And a hollow connecting piece 26 is arranged between the converter joint and the oil pipe joint. The lower end of the oil pipe joint is connected with a lower sealing sleeve 27, the lower end of the lower sealing sleeve is sleeved on the upper portion of the sand control filling tool, an O-shaped ring 29 is located on the lower portion of a circulation hole of the sand control filling tool, a liquid flow channel is formed between the lower sealing sleeve and the sand control filling tool, and the liquid flow channel is communicated with an oil pipe annulus.
The sand control filling tool is provided with a mortar outlet 66 and a filling tool circulation hole 6 which are respectively positioned below and above a sand control filling tool rubber sleeve (see figure 1), the mortar outlet can be opened by continuously pressurizing after the sand control filling tool is sealed, and then the mortar outlet can be communicated with the circulation hole (namely, the mortar flows out from the mortar outlet, sand is blocked in an oil sleeve annular space by a screen pipe, and liquid without sand enters the circulation hole of the sand control filling tool through the screen pipe and then enters the oil pipe annular space.
The tubular column structure is characterized in that: the multi-channel packer 3 and the sand prevention filling tool 8 need to be respectively placed at the upper boundary and the lower boundary of the oil layer I; the multi-channel packer 3 is respectively connected with the outer oil pipe 4 and the inner oil pipe 5 through oil pipe threads, and the multi-channel packer circulation hole 2 is positioned at the upper part of a packer rubber barrel; the outer oil pipe 4 and the inner oil pipe 5 are connected with a channel converter 7 through oil pipe threads, and the filling tool circulation hole 6 is positioned at the upper part of a rubber sleeve of the sand-proof filling tool 8 and is positioned in the annular space formed by the outer oil pipe 4 and the inner oil pipe 5.
The process comprises the following steps: after the pipe column is in place according to the design, the pipe column is lifted to a certain height firstly, the oil pipe is filled with liquid pressure to seat the sand control filling tool 8, the pipe column is lowered to seat the multi-channel packer 3, the oil pipe is continuously filled with liquid pressure to suddenly drop the pressure, the oil sleeve annulus is drained, the circulation channel of the sand control filling tool 8 is opened, then the well mouth is installed, and the sand control filling construction is started. After the sand control construction is finished, the pipe column is directly lifted to a certain height, the multi-channel packer 3 is unsealed, the pipe column is continuously lifted to a certain tonnage, the sand control filling tool 8 is released by a certain number of times of forward transmission pipe column, and the pipe column is continuously lifted until the construction pipe column is completely lifted out of the well, so that the construction of the process is finished.
Referring to the attached fig. 1, 2 and 3, in order to describe a specific method for packing an oil layer one, the structural principle of a multi-channel packer 3 and a channel converter 7 is shown in a half section.
The structural principle of the multi-channel packer 3 is as follows: the central tube 13 is connected with the inner tube lower joint 19 to form an inner tube channel; the sliding upper joint 12, the packer 16, the connecting sleeve 18 and the outer pipe lower joint are connected with the central pipe 13 and the inner pipe lower joint 19 to form an annular channel; the packer 16 is a Y111 type packer, and an oil sleeve annular channel is formed by the multi-channel packer 3 and the sleeve 11; after the multi-channel packer 3 is set, the oil sleeve annular channel can be sealed up and down under the sealing of the Y111 type packer rubber barrel, and the other two channels are not influenced.
The structural principle of the channel switch 7 is as follows: the converter joint 24 is connected with the inner oil pipe 5 through an oil pipe buckle 23 and is connected with the sand control filling tool 8 through an oil pipe buckle 28 to form an inner pipe channel; the upper part of the oil pipe joint 25 is connected with the outer oil pipe 4, and the lower part of the oil pipe joint is connected with a middle through connecting piece 26 and a lower sealing sleeve 27 (an O-shaped ring 29 at the lower part of the sealing sleeve 27 is positioned below a reverse liquid outlet of the sand control filling tool 8), so as to form an annular channel with the converter joint 24 and the upper part (from the reverse liquid outlet) of the sand control filling tool 8; because the packing rubber of the sand control packing tool 8 is located below the reverse fluid outlet, the oil jacket annulus channel formed by the sand control packing tool 8 and the casing 11 is not associated with the other two channels.
The multi-channel packer is respectively connected with oil pipes with two different diameters and then is connected with the sand filling and preventing tool through the double-channel connector to form two liquid flow channels, namely an inner pipe channel and a pipe channel (namely an annular channel formed between the oil pipes with the two different diameters). During construction, the sand prevention tool is pressed, set and filled through the inner pipe channel; setting a multi-channel packer through a lowering pipe column; and continuously pressurizing to open a circulation channel of the sand control tool, and at the moment, establishing communication between the inner pipe channel and the pipe channel. Under the action of an annular sealing mechanism consisting of a multi-channel packer and a filling sand control tool, an upper oil layer is sealed. And then carrying out normal sand control filling operation. After the filling sand prevention construction is finished, directly lifting the pipe column for a certain tonnage, and deblocking the multi-channel packer; then, the pipe column is rotated positively to release the filling tool; and finally, lifting the pipe column until the construction pipe column is lifted, and finishing the sand prevention construction.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, but rather should be construed in all respects as illustrative and not restrictive.

Claims (7)

1. A packing upper layer and filling lower layer integrated sand control pipe column is characterized by comprising an upper oil pipe, a multi-channel packer, a double-layer oil pipe, a channel converter, a sand control filling tool, a sieve pipe and a plug which are sequentially connected from top to bottom; the double-layer oil pipe comprises an outer oil pipe and an inner oil pipe arranged in the outer oil pipe, the lower joint of the outer pipe of the multi-channel packer is connected with the outer oil pipe through an oil pipe buckle, and the lower joint of the inner pipe of the multi-channel packer is connected with the inner oil pipe through an oil pipe buckle; the inner oil pipe is connected with a converter joint of the channel converter through an oil pipe buckle, and the outer oil pipe is connected with an oil pipe joint of the channel converter; the lower end of a converter joint of the channel converter is connected with a sand prevention filling tool through an oil pipe buckle, an O-shaped ring at the lower part of a lower sealing sleeve of the channel converter is positioned at the lower part of a circulation hole of the filling tool, and the circulation hole of the filling tool is arranged on the sand prevention filling tool; an oil pipe annulus is formed between the inner oil pipe and the outer oil pipe, wherein a middle channel of the multi-channel packer is communicated with a central cavity of the inner oil pipe, a side channel of the multi-channel packer is communicated with the oil pipe annulus, the multi-channel packer comprises a packer, a central pipe, a sliding upper joint and a connecting sleeve, the central pipe is positioned in the packer, the middle channel is arranged in the central pipe, the side channel is formed between the central pipe and the packer, the upper end of the packer is connected with the sliding upper joint through the packer upper joint, the lower end of the central pipe is connected with a lower joint of the inner pipe, and the lower end of the packer is connected with the lower joint of the outer pipe through the packer lower joint and the connecting sleeve in sequence; the sliding upper joint and the central pipe form an edge flow passage, the edge flow passage is communicated with the edge channel, the sliding upper joint is provided with a radial hole, the radial hole is communicated with the edge flow passage, and the upper end of the sliding upper joint is connected with an upper oil pipe.
2. The integrated sand control pipe string with the upper packing layer and the lower packing layer as claimed in claim 1, wherein a lower flow passage is formed between the lower joint of the outer pipe and the lower joint of the inner pipe, the upper end of the lower flow passage is communicated with the side passage, the lower end of the lower flow passage is communicated with an annular space of the oil pipe, the lower end of the lower joint of the inner pipe is connected with the inner oil pipe through an oil pipe buckle, and the lower end of the lower joint of the outer pipe is connected with the outer oil pipe through an oil pipe buckle.
3. The integrated sand control pipe column with the packed upper layer and the packed lower layer as claimed in claim 1, wherein a through connecting member is arranged between the connecting sleeve and the central pipe, and the through connecting member is positioned at the upper part of the lower joint of the inner pipe.
4. The packing upper and lower integrated sand control string as recited in claim 1, wherein the passage switch comprises a switch joint and a tubing joint, the tubing joint is disposed outside the switch joint and forms a switch passage therebetween, the switch joint is connected to the inner tubing at an upper end and connected to the sand control packing tool at a lower end, the tubing joint is connected to the outer tubing at an upper end, and the switch passage is communicated with the tubing annulus.
5. The integrated sand control string with the packed upper layer and the packed lower layer as claimed in claim 4, wherein a through connection member is arranged between the converter joint and the tubing joint.
6. The integrated sand control pipe string with the packed upper layer and the packed lower layer as claimed in claim 4, wherein the lower end of the tubing joint is connected with a lower sealing sleeve, and the lower end of the lower sealing sleeve is connected with a sand control packing tool.
7. The integrated sand control pipe string with the packed upper layer and the packed lower layer as claimed in claim 4, wherein the sand control packing tool is further provided with a mortar outlet, and the mortar outlet and the packing tool circulation hole are respectively located below and above the rubber cylinder of the sand control packing tool.
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CN113931598B (en) * 2021-12-16 2022-02-25 纬达石油装备有限公司 Sand prevention filling device and using method thereof

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CN205936552U (en) * 2016-07-29 2017-02-08 东营市世创石油技术有限公司 Selective sand control layered oil exploitation integrated process tubular column
CN106321009A (en) * 2016-09-14 2017-01-11 中国石油天然气股份有限公司 Two-channel packer for concentric two-layer oil pipe separate injection

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