CN213450304U

CN213450304U - Sand filtering pipe sand control is washed off and is stuck technique tubular column of releasing down suitable for big angle well in beach sea

Info

Publication number: CN213450304U
Application number: CN202022319882.1U
Authority: CN
Inventors: 姜涛; 滕学伟; 段志刚; 冷强; 侯利; 徐丽霞; 贾庆乐
Original assignee: China Petroleum and Chemical Corp; Sinopec Shengli Oilfield Co Zhuangxi Oil Extraction Plant
Current assignee: China Petroleum and Chemical Corp; Sinopec Shengli Oilfield Co Zhuangxi Oil Extraction Plant
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2021-06-15
Anticipated expiration: 2030-10-16

Abstract

The utility model discloses a sand filtering pipe sand control blanking stuck-releasing process pipe column suitable for a beach sea highly-deviated well, which comprises an inner pipe, a sand filtering pipe, a flushing pipe, an inner circulating pipe, an outer sleeve and a piston; the sand filtering pipe is sleeved outside the inner pipe, an annular channel called an upper annular channel is formed between the sand filtering pipe and the inner pipe, and the lower end of the sand filtering pipe is connected with the upper end of the outer sleeve; the lower end of the inner pipe is connected with a washing pipe; the inner circulating pipe is positioned in the outer sleeve, an annular channel is formed between the inner circulating pipe and the outer sleeve and is called as a lower annular channel, the inner circulating pipe is provided with radial sand washing holes, and the sand washing holes enable the inner cavity of the inner circulating pipe to be communicated with the lower annular channel; the piston is arranged on the inner wall of the inner circulating pipe and can open and close the radial sand washing hole. The sand control pipe column of the sand filter pipe can be lowered while flushing, the problem that the sand control pipe column of the sand filter pipe of the high-strength sand producing oil well is not in place is avoided, and the operation cost is reduced. The problem of the locking effect of the annular stratum sand between the sand screen and the sleeve on the sand screen sand control pipe column is solved. The success rate of salvaging the sand control pipe column of the sand filter pipe is improved, and the operation cost is reduced.

Description

Sand filtering pipe sand control is washed off and is stuck technique tubular column of releasing down suitable for big angle well in beach sea

Technical Field

The utility model belongs to the technical field of the oil development sand control instrument technique in pit and specifically relates to a sand filtration sand control dashes and unfreezes technology tubular column down suitable for beach sea highly deviated well.

Background

The loose sandstone oil reservoir oil wells of the oil extraction plant in the West province are mainly distributed in the old 163, the pile 106, the pile incline 139, the pile 1 and the like, and 95 percent of the oil wells need sand control measures. The common sand control mode comprises mechanical sand control and chemical sand control, the chemical sand control is limited by the length of a well section, and the well section is generally only suitable for processing a short well section and is not more than 5 m; the wellbore interval is too long and it is difficult to uniformly distribute the chemical agent throughout the wellbore interval due to differences in the intake capacity between the layers. The chemical agent is aged along with time under the condition of an oil layer, the strength is poor, and the effective period is short. The mechanical sand control is not limited by the length of a well section, the sand control strength is high, the period of validity is long, and the sand control adaptability is strong. In mechanical sand control, sand control of a sand filter pipe is low in sand control cost compared with filling sand control, and the sand control pipe is widely applied to oil production plants. However, as the production time of the oil well is prolonged, sand production of a part of the well is serious, so that the sand control pipe column of the sand screen pipe cannot normally fall to a designed position. The sand screen pipe has strong permeability but does not have a well-flushing function. The packer is easily set when the oil pipe is positively washed with sand, and the backflushing sand cannot be set although the packer cannot be set, but cannot wash out the formation sand due to the filtering and sand blocking functions of the sand filtering pipe. Some sand screen hang packer possess well-flushing function before the bowling seat seals, but only can wash above the packer, just can not wash below the packer. The sand-filtering pipe sand-preventing pipe column needs to be pulled out, the sand-washing pipe column is put in again for sand washing, sand cannot be guaranteed not to be spitted out from the stratum after sand washing is completed, and the sand-filtering pipe sand-preventing pipe column can be damaged in the pulling-out and pulling-in process. Therefore, in order to ensure that the sand control construction is successful at one time, the sand control pipe column of the sand filter pipe is generally replaced, so that the operation period is prolonged, the operation cost is increased, and the success of sand control construction of the sand filter pipe can not be ensured. In addition, the well is led to lying because of the sand production in the later stage, when needing to salvage sand screen sand control tubular column, because the locking effect of the annular space stratum sand between sand screen and the sleeve pipe to sand screen sand control tubular column, it is big to directly salvage the unblock load, salvages the difficulty, easily causes equipment damage. At present, a method of firstly milling and then fishing is commonly used. The oil well with serious sand production needs to be milled and salvaged for many times, the operation period is long, the oil extraction rate is low, and even major repair accidents or oil well scrapping can be caused if the blockage removal is unsuccessful. In addition, the casing milling requires a large enough annular space between the sand filtering pipe and the casing, part of oil wells are limited by the size of the casing, the annular space between the sand filtering pipe and the casing is small, the casing milling construction cannot be implemented, and the serious difficulty is caused on how to efficiently salvage and unfreeze the sand filtering pipe sand control pipe column.

Therefore, it is necessary to develop a sand screen sand control flushing stuck release process tubular column suitable for the high-rise high-inclination well, which can realize flushing while flushing when the sand screen sand control tubular column meets resistance due to sand production, so as to avoid the problem of non-in-place flushing of the sand screen sand control tubular column of the high-strength sand production well and reduce the operation cost. When the sand filtering pipe sand control pipe column needs to be pulled out due to sand production lying in the later stage, the problem of locking effect of the formation sand in the annulus between the sand filtering pipe and the sleeve on the sand filtering pipe sand control pipe column is solved. The success rate of salvaging the sand control pipe column of the sand filter pipe is improved, and the operation cost is reduced.

At present, a horizontal well sand control pipe column for gravel packing while flushing is disclosed as follows: CN105626000A discloses gravel packing sand control tubular column is gone down while washing to horizontal well, including washing and preventing the outer tubular column, wash sand inner tube post, extrusion packing sand control inner tube post are equipped with to wash sand outer tubular column inside, wash sand inner tube post at first pack into wash and prevent in the outer tubular column and accomplish and wash work and play out, then extrusion packing sand control inner tube post is gone into again and is washed and prevent inside the outer tubular column. The utility model can realize the integrated completion of shaft flushing and sand prevention, shorten the sand prevention construction period of the sand flow stratum of the horizontal well and save the cost; keep the pit shaft clean, ensure that the sand control tubular column reachs the design position smoothly, it is reliable to fill the passageway and close, improves bottom extrusion and fills the construction success rate. This sand control tubular column can realize function under the limit is washed, but can not solve the filling sand or the locking effect of stratum sand of filling the annular space between sand control pipe and the sleeve pipe to the sand control tubular column, salvage the difficulty of unfreezing, easily cause equipment damage, can cause overhaul accident or the condemned risk of oil well even.

In addition, the following sand control pipe columns are also provided:

publication No.: CN209212188U, screen hanger, discloses a screen hanger. The method comprises the following steps: the inner pipe assembly is communicated with the sand washing pipeline; the releasing outer pipe assembly is sleeved outside the inner pipe assembly; cone and slips, all the cover is established outside the inner tube subassembly, and the cone can prolong the axial slip of inner tube subassembly, and the cone has big footpath end and path end, forms the hydraulic pressure space between the outer wall of big footpath end, inner tube subassembly and the inner wall of giving up the outer tube subassembly, the inside intercommunication of hydraulic pressure space and inner tube subassembly, path end orientation slips and can penetrate between slips and the inner tube subassembly. The beneficial effects of the utility model are that, connect the sand washing pipeline through inner tube subassembly, the nonmetal screen pipe of external connection can be gone into the well operation in-process at whole tubular column and establish the mud circulation, realizes tubular column limit under the limit of dashing, can go into the in-process under the effective treatment nonmetal screen pipe and hinder the phenomenon, the injury to the reservoir bed in furthest's the reduction operation in earlier stage. And the cone and the slips are arranged simultaneously to realize the hanging function of the pipe column.

The following drawbacks exist: the locking effect of the filling sand or the stratum sand of the annular space between the non-metal screen pipe and the sleeve pipe to the sand control pipe column can not be solved, the fishing and the releasing are difficult, the equipment damage is easy to cause, and even the major repair accident or the scrapped risk of the oil well can be caused.

Publication No.: CN208734320U, valve plate formula is towards filling instrument down, discloses valve plate formula is towards filling instrument down. Comprises a sealing cylinder, a valve body, a filling cylinder, a flushing head and a sealing plug. When the pipe column is put into a blockage, the pipe column is flushed and put down while pushing away the valve plate through the sealing plug to form a circulating channel, sand at the bottom of the pipe column is washed out of the ground, and the pipe column is smoothly put down to a specified position; and then, putting a steel ball into the valve body, pressing the steel ball to test the sealing degree, continuously pressing the steel ball, cutting off the ball seat, exposing a filling opening, filling, and after filling is finished, lifting out the sealing plug, and resetting the valve plate under the action of the resetting elastic piece to ensure sealing. The working efficiency is improved by the arrangement.

The following drawbacks exist: the locking effect of the filling sand or the stratum sand in the annular space between the filling sand control pipe and the sleeve pipe to the sand control pipe column can not be solved, the fishing and releasing difficulty is caused, the equipment damage is easy to cause, and the major repair accident or the scrapped risk of an oil well can be even caused.

Publication No.: CN204357380U, integrated instrument down rushes, discloses an integrated instrument down rushes, including outer tubular column and inner tubular column, outer tubular column includes top connection, outer tube, sliding sleeve, returns the sand pipe, sand washing guide head, the inner tubular column is including washing a tub coupling, seal cover, sealed washing pipe, sealing member, locating pin, have easy operation, the leakproofness is good, site operation advantage such as convenient, realize that a tubular column accomplishes sand washing sand control operation, the limit that is particularly suitable for when going into intraductal sand control tubular column is washed the operation down, guarantee that the tubular column goes into the design position smoothly.

The following drawbacks exist: the filling sand or the stratum sand of the annulus between sand control pipe and the sleeve pipe can not be solved to the locking effect of sand control tubular column, salvage and unfreeze difficulty, easily cause equipment damage, and even can cause major repair accident or the condemned risk of oil well.

Publication No.: CN201474678U, sand washing and filling sand control pipe column, discloses a sand washing and filling sand control pipe column, including bottom server, sealing plug, outer tube coupling adjustment mechanism, inner tube coupling adjustable joint mechanism, circulation sealing double-way body mechanism, hang giving up and seal off sealing mechanism, sand control wash pipe and sand filter pipe. The bottom server is connected with a sand filter pipe by a coupling, the sand filter pipe is connected with an outer pipe connection adjusting mechanism through a lower adjusting cap, the outer pipe connection adjusting mechanism is connected with a lower connector of a hanging packer mechanism through an upper connector of the outer pipe connection adjusting mechanism, and a sealing plug, a sand control flushing pipe, an inner pipe connection loose joint mechanism and a circulating sealing double-fluid mechanism are sequentially connected and installed in the inner cavity of the bottom server, the sand filter pipe, the outer pipe connection adjusting mechanism and the hanging packer mechanism. The utility model has the characteristics of the function is strong, and a string can be respectively or accomplish several processes such as sand washing, thick liquid replacement, acidizing, packing sand control simultaneously, saves labour, saves time, efficient, with low costs, sealing performance is good, extensively uses in the oil recovery technology.

The following drawbacks still exist: the locking effect of the filling sand or the stratum sand in the annular space between the filling sand control pipe and the sleeve pipe to the sand control pipe column can not be solved, the fishing and releasing difficulty is caused, the equipment damage is easy to cause, and the major repair accident or the scrapped risk of an oil well can be even caused.

The integration sand control tubular column of rushing down that exists has the multiple at present, generally can not solve the filling sand or the locking effect of stratum sand to the sand control tubular column of the annular space between filling sand control pipe and the sleeve pipe, salvages the difficulty of unfreezing, easily causes equipment damage, can cause overhaul accident or the condemned risk of oil well even. Therefore, it is necessary to develop a sand screen sand control flushing stuck release process tubular column suitable for the high-rise high-inclination well, which can realize flushing while flushing when the sand screen sand control tubular column meets resistance due to sand production, so as to avoid the problem of non-in-place flushing of the sand screen sand control tubular column of the high-strength sand production well and reduce the operation cost. When the sand filtering pipe sand control pipe column needs to be pulled out due to sand production lying in the later stage, the problem of locking effect of the formation sand in the annulus between the sand filtering pipe and the sleeve on the sand filtering pipe sand control pipe column is solved. The success rate of salvaging the sand control pipe column of the sand filter pipe is improved, and the operation cost is reduced.

In a word, above technical scheme of the disclosure and the technical problem that will solve and the beneficial effect who produces all with the utility model discloses inequality, perhaps technical field or application are different, are directed against the utility model discloses more technical problem and the beneficial effect that will solve, above all there is not technological inspiration in the technical document of disclosing.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a sand screen sand control is washed and is stuck freeing technology tubular column under to the above-mentioned defect that prior art exists suitable for beach sea highly inclined shaft, when going into sand screen sand control tubular column under and meeting the resistance because of going out sand, can realize the sand screen sand control tubular column under the limit of washing, avoid the problem that high strength goes out sand oil well sand screen sand control tubular column not in place down, reduce the working costs. When the sand filtering pipe sand control pipe column needs to be pulled out due to sand production lying in the later stage, the problem of locking effect of the formation sand in the annulus between the sand filtering pipe and the sleeve on the sand filtering pipe sand control pipe column is solved. The success rate of salvaging the sand control pipe column of the sand filter pipe is improved, and the operation cost is reduced.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a sand-filtering pipe sand-prevention washing-down stuck-releasing process pipe column suitable for a beach sea highly-deviated well comprises an inner pipe, a sand-filtering pipe, a washing pipe, an inner circulating pipe, an outer sleeve and a piston;

the sand filtering pipe is sleeved outside the inner pipe, an annular channel called an upper annular channel is formed between the sand filtering pipe and the inner pipe, and the lower end of the sand filtering pipe is connected with the upper end of the outer sleeve;

the lower end of the inner pipe is connected with a washing pipe;

the inner circulating pipe is positioned in the outer sleeve, an annular channel is formed between the inner circulating pipe and the outer sleeve and is called as a lower annular channel, the inner circulating pipe is provided with radial sand washing holes, and the sand washing holes enable the inner cavity of the inner circulating pipe to be communicated with the lower annular channel;

the piston is arranged on the inner wall of the inner circulating pipe and can open and close the radial sand washing hole.

Furthermore, the lower end of the sand filtering pipe is connected with the upper end of the outer sleeve through a connecting sleeve, the upper end of the inner circulating pipe is connected with the connecting sleeve, and the lower end of the inner pipe is connected with the flushing pipe through a flushing pipe joint.

Furthermore, the outer wall of the flushing pipe is provided with a shoulder which can press the piston and drive the piston to axially run; the washing pipe is a washing pipe or a sand washing pipe.

Furthermore, the lower end of the flushing pipe is a blind end, and the flushing pipe is provided with a radial circulation hole which can be communicated with the radial sand flushing hole.

Further, the sand washing and washing pipe is an axial through pipe.

Furthermore, the lower end of the inner circulating pipe is connected with an inner circulating pipe joint, the lower end port of the inner circulating pipe joint is provided with a reducing step, and a toughened glass baffle is mounted on the reducing step, namely the toughened glass baffle is fixed on the reducing step through a pressing ring.

Furthermore, the flushing pipe is connected with the internal circulation pipe through a first-stage shear pin, and the joint of the internal circulation pipe is connected with the internal circulation pipe through a second-stage shear pin.

Furthermore, the piston is a tubular piston, the piston is arranged inside the inner circulating pipe and forms a sliding sealing pair, and the piston can block the radial sand washing hole.

Furthermore, the lower end of the piston is connected with a spring, the lower end of the spring is connected to a lower inner ring platform arranged on the inner wall of the inner circulating pipe, and an upper inner ring platform for preventing the piston from moving upwards is further arranged on the inner wall of the inner circulating pipe.

Furthermore, the upper end of the sand filtering pipe is connected with a packer, the upper end of the packer is connected with an oil pipe, and the upper end of the inner pipe is connected with a washpipe compensator.

Compared with the prior art, the utility model following beneficial effect has:

1. increased in conventional sand screen lower part and washed down the card valve of separating (promptly the utility model discloses perhaps can realize the utility model discloses the device of function), this technology tubular column not only can realize washing sand and filter down the integration, and the sand screen tubular column is transferred on one side to the back flush sand promptly and is up to the design position. And the packer setting can be closed after being released, so that the circulation channel for flushing the releasing valve can be closed to complete sand prevention construction, the problem that the sand prevention pipe column of the sand filtering pipe of the high-strength sand producing oil well is not in place is solved, and the operation cost is reduced.

2. The later stage need be played and is stayed well sand screen sand control tubular column and can be gone into the washing pipe and get into the inside limit of sand screen tubular column and wash down when going out, can open the outer circulation passageway of washing down the card valve that separates once more, and special washing pipe joint can directly break the bottom of washing down the card valve that separates, outside formation circulation at the instrument, realize sand screen bottom of the tubular column portion washing out the card, utilize the gravity of rivers suction and formation sand free fall to wash out the stratum sand in sleeve pipe and the sand screen sand control tubular column annular space, then salvage the operation, solve the problem of the locking effect of the annular space's of sand screen sand control tubular column between sand screen and the sleeve pipe stratum sand. The success rate of salvaging the sand control pipe column of the sand filter pipe is improved, and the operation cost is reduced.

3. The utility model discloses bottom circulation channel design under limit flushing is annular feed liquor channel, and the feed liquor is simultaneously gone into all around from the instrument to liquid, and the sleeve pipe is pressed close to more in the feed liquor hole, and highly deviated well, horizontal well sleeve pipe lie sand can be driven by liquid and get into circulation channel, and the sand washing is effectual.

Drawings

FIG. 1 is a schematic structural view of a sand screen sand control washing-down stuck release process pipe column suitable for a beach sea highly-deviated well in the process of sand washing and filtering;

FIG. 2 is a schematic structural diagram of the sand screen sand control flushing stuck-releasing process pipe column suitable for the beach large-inclination well of the utility model when the circulation channel is closed after the well is left;

fig. 3 is the structure schematic diagram of the sand screen sand control of the beach highly deviated well when the bottom of the sand screen sand control is broken free and stuck in the process pipe column is broken free.

In the figure: the device comprises an oil pipe 1, a packer 2, a washpipe compensator 3, a sand filter pipe 4, an inner pipe 5, a washpipe joint 6, a connecting sleeve 7, a washpipe 8, a primary shear pin 9, an upper piston O-shaped ring 10, a lower piston O-shaped ring 11, a piston 12, a secondary shear pin 13, a spring 14, an inner circulation pipe 15, a pressure ring 16, a toughened glass baffle 17, an outer sleeve 18, an inner circulation pipe joint 19 and a washpipe 20.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1:

referring to fig. 1 to 3, the present invention provides a technical solution:

a sand-filtering pipe sand-control blanking stuck-releasing process pipe column suitable for a beach sea highly-deviated well comprises an inner pipe 5, a sand-filtering pipe 4, a flushing pipe, an inner circulating pipe 15, an outer sleeve 18 and a piston 12;

the lower end of the inner pipe is connected with a washing pipe;

Furthermore, the lower end of the sand filtering pipe is connected with the upper end of the outer sleeve through a connecting sleeve 7, the upper end of the inner circulating pipe is connected with the connecting sleeve, and the lower end of the inner pipe is connected with the washing pipe through a washing pipe joint 6.

Furthermore, the outer wall of the flushing pipe is provided with a shoulder which can press the piston and drive the piston to axially run; the washing pipe is a washing pipe 8 or a sand washing pipe 20.

Further, the sand washing and washing pipe is an axial through pipe.

Furthermore, the lower end of the inner circulating pipe is connected with an inner circulating pipe joint 19, the lower end port of the inner circulating pipe joint is provided with a reducing step, and a toughened glass baffle plate 17 is installed on the reducing step, namely the toughened glass baffle plate is fixed on the reducing step through a pressing ring.

Furthermore, the washing pipe is connected with an internal circulation pipe through a first-stage shear pin 9, and the joint of the internal circulation pipe is connected with the internal circulation pipe through a second-stage shear pin 13.

Further, the lower end of the piston is connected with a spring 14, the lower end of the spring is connected to a lower inner ring platform arranged on the inner wall of the inner circulating pipe, and an upper inner ring platform for preventing the piston from moving upwards is further arranged on the inner wall of the inner circulating pipe.

Furthermore, the upper end of the sand filtering pipe is connected with a packer 2, the upper end of the packer is connected with an oil pipe 1, and the upper end of the inner pipe is connected with a washpipe compensator 3.

1. And (3) filtering and washing sand:

the flushing release valve is connected to the bottom of the sand filter pipe 4 according to design requirements, the inner flushing pipe joint 6 is connected with the inner filtering flushing pipe 5, the flushing pipe compensator 3 and the inner packer pipe, and the sand filter pipe 4 is connected with the lower joint of the packer 2. The tool starts to recoil the sand oil pipe of the sleeve after reaching the sand surface to form an outlet, because the upper part of the flushing pipe 5 in the sand filtering pipe 4 is hermetically connected with the releasing part of the packer, the flushing pipe 8 at the lower part is hermetically contacted with the flushing release valve, and the inside of the sand filtering pipe is a closed space, no liquid flow is generated. Before releasing the hand, the liquid can directly reach the bottom of the flushing releasing valve and can not enter the oil pipe 1 after passing through the sand filtering pipe 4. After reaching the bottom, the liquid enters through the annular space between the outer sleeve 18 and the internal circulation joint 19 and the internal circulation pipe 15, then enters the tool through the liquid flow channel of the internal circulation pipe 15, and then enters the flushing pipe 8, and then the liquid reaches the ground through the inner pipe 5, the flushing pipe compensator 3, the inner pipe of the packer and the oil pipe 1.

The dash and release the card valve and also mean the utility model discloses, perhaps can realize the utility model discloses a some similar devices.

2. Closing a circulating channel:

when the sand filter pipe 4 reaches a designed position, a ball is thrown to positively press the packer 2 seat, after the packer seat is determined to be reliable, the packer is positively rotated and reversely buckled to release the packer, at this time, the pipe column needs to be slowly lifted, the washpipe compensator 3 is opened, then the washpipe compensator continues to be slowly lifted, the interior of the washpipe trip valve is cut off by the first-stage shear pin 9 limited by the washpipe, at this time, the ground tension meter has obvious fluctuation, the washpipe trip valve continues to be slowly lifted, at this time, the washpipe 8 pushes the piston 12 upwards under the double action of the second-stage shear pin 13 and the spring 14, and the liquid flow channel on the inner circulation pipe. When the piston 12 reaches the limit station, the piston does not continuously move upwards any more, the secondary shear pin 13 on the piston 12 is sheared off, and the ground tension meter fluctuates for the second time, so that the closing process of the whole channel is completed.

3. Bottom punching and unfreezing:

when the sand filtering and sand preventing pipe column needs to be pulled out due to sand production and well laying in the later period, firstly, a proper flushing pipe is selected, then a special flushing pipe joint is connected to the lower portion of the flushing pipe 20 (the special flushing pipe joint is used for opening a circulating channel and a bottom channel of a downward flushing stuck valve), when the flushing pipe reaches the top of a 2-fish-shaped packer, positive sand flushing is started, the flushing pipe slowly enters the central pipe of the packer, at the moment, the flushing pipe is flushed downward, the interiors of the central pipe of the packer 2, the central pipe of the sand filtering pipe 4 and the downward flushing stuck valve are flushed completely, and the annular space between the flushing pipe 20 and the sand filtering pipe and sand preventing pipe column. Due to the reasons of throttling in the downward flushing stuck-releasing valve, space reduction and the like, the flushing pipe joint enters the downward flushing stuck-releasing valve, and the water flow at the outlet is reduced. At this moment, the flushing pipe needs to be slowly lowered, the flushing pipe joint can firstly press down the piston 12 to open the closed external circulation channel, when the external circulation channel is completely opened, the pipe column continues to be lowered, the bottom toughened glass baffle 17 of the flushing release valve is opened, the flushing pipe is flushed out of the sand control pipe column of the sand filter pipe and enters the casing pipe, and the liquid flow circulation channel at this moment can be formed outside the tool. The liquid flow is flushed out through the flushing pipe joint to reach the casing pipe to flush formation sand, then the liquid flows through the annular space between the outer sleeve 18 and the inner circulation joint 19 as well as the inner circulation pipe 15 to enter the tool, then enters the tool through the liquid flow channel of the inner circulation pipe 15, enters the casing pipe through the annular space between the flushing pipe and the sand control pipe column central pipe of the sand filter pipe, and finally is flushed out of the ground. For a vertical well or a directional well with the well inclination less than 45 degrees, the sand can be directly flushed positively, because the formation sand at the upper part can continuously fall under the action of gravity under the condition that the formation sand is flushed away at the bottom part until the formation sand is thoroughly flushed; for a highly deviated well and a horizontal well with a well inclination larger than 45 degrees, the falling capacity of stratum sand under the gravity is poor, the positive flushing sand only can flush a section of the bottom of the tool, the stratum sand below a packer above a flushing release valve cannot be flushed, at the moment, the positive flushing and the back flushing can be carried out firstly, and the stratum sand in the annular space between a sand filter pipe and a sleeve is flushed through a flushing pipe by utilizing the permeability of the sand filter pipe and the backflow of liquid.

4. The lower special fishing tool salvages the sand control pipe column.

Example 2:

referring to fig. 1 to 3, the present invention provides a technical solution:

the lower end of the inner pipe is connected with a washing pipe;

Further, the sand washing and washing pipe is an axial through pipe.

Example 3:

referring to fig. 1 to 3, the present invention provides a technical solution:

the lower end of the inner pipe is connected with a washing pipe;

Further, the sand washing and washing pipe is an axial through pipe.

Although fig. 1 is used for all the above embodiments, it is obvious to those skilled in the art that a separate drawing is not shown as long as parts or structural features missing in the embodiments are removed from the drawing or replaced by other similar mechanisms. As will be clear to the skilled person. Of course, the embodiments with more components are only the preferred embodiments, and the embodiments with fewer components are the basic embodiments, but the basic objects of the present invention can also be achieved, so all of these modified embodiments are within the scope of the present invention.

All parts and parts which are not discussed in the present application and the connection mode of all parts and parts in the present application belong to the known technology in the technical field, and are not described again. Such as welding, threaded connections, etc.

In the present application, the term "plurality" means two or more unless expressly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.

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

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A sand-filtering pipe sand-control blanking stuck-releasing process pipe column suitable for a beach sea highly-deviated well is characterized by comprising an inner pipe, a sand-filtering pipe, a flushing pipe, an inner circulating pipe, an outer sleeve and a piston;

the lower end of the inner pipe is connected with a washing pipe;

2. The sand-screen pipe sand-control blanking stuck-releasing process pipe column suitable for the beach sea highly-deviated well according to the claim 1, characterized in that the lower end of the sand screen pipe is connected with the upper end of the jacket through a connecting sleeve, the upper end of the inner circulating pipe is connected with the connecting sleeve, and the lower end of the inner pipe is connected with the flushing pipe through a flushing pipe joint.

3. The sand-filtering pipe sand-control blanking stuck-releasing process pipe column suitable for the beach sea highly-deviated well according to the claim 1, characterized in that the outer wall of the flushing pipe is provided with a shoulder which can press the piston and drive the piston to axially run; the washing pipe is a washing pipe or a sand washing pipe.

4. The sand screen sand control blanking stuck-releasing process pipe column suitable for the beach sea highly-deviated well according to the claim 3, characterized in that the lower end of the flushing pipe is a blind end, and the flushing pipe is provided with a radial through hole which can be communicated with the radial sand screen hole.

5. The sand-screen pipe sand-control blanking stuck-release process pipe column suitable for the beach sea highly-deviated well according to claim 3, characterized in that the sand-screen pipe is an axial through pipe.

6. The sand-filtering pipe sand-control blanking stuck-releasing process pipe column suitable for the beach sea highly-deviated well according to the claim 1, 2, 3, 4 or 5, characterized in that the lower end of the inner circulating pipe is connected with an inner circulating pipe joint, the lower end port of the inner circulating pipe joint is provided with a reducing step, and a toughened glass baffle is arranged on the reducing step, namely the toughened glass baffle is fixed on the reducing step through a press ring.

7. The sand-filtering pipe sand-prevention washing-down stuck-release process pipe column suitable for the beach sea highly-deviated well according to claim 6, characterized in that the washing pipe is connected with an internal circulation pipe through a primary shear pin, and the joint of the internal circulation pipe is connected with the internal circulation pipe through a secondary shear pin.

8. The sand screen sand control of beach great deviation well breaks stuck technology tubular column down suitable for according to claim 2 or 3 or 4 or 5 or 7, characterized by, the said piston is the tubular piston, the said piston is placed inside inner circulation pipe, and form the sliding seal pair, the piston can block off the hole of sand screen radially.

9. The sand screen sand control washing-down stuck releasing process pipe column suitable for the beach sea highly inclined shaft as claimed in claim 8, wherein the lower end of the piston is connected with a spring, the lower end of the spring is connected with a lower inner ring platform arranged on the inner wall of the inner circulating pipe, and the inner wall of the inner circulating pipe is also provided with an upper inner ring platform for preventing the piston from ascending.

10. The sand screen sand control washdown stuck-releasing process string suitable for beach sea highly deviated wells as claimed in claim 2, 3, 4, 5 or 7, wherein the upper end of the sand screen is connected with a packer, the upper end of the packer is connected with an oil pipe, and the upper end of the inner pipe is connected with a washpipe compensator.