CN210977314U - Isolated high-pressure-resistance underground pipe column - Google Patents

Abstract

The utility model discloses an isolated high-pressure-resistant downhole tubular column, which belongs to the technical field of oil gas drilling and production, and comprises a downhole tubular column outer pipe, a downhole tubular column inner pipe is arranged inside the downhole tubular column outer pipe, the downhole tubular column inner pipe is vertically arranged inside the downhole tubular column outer pipe, an upper eccentric production allocator is arranged on the downhole tubular column inner pipe, the upper eccentric production allocator is sleeved with the upper end of the downhole tubular column inner pipe, the improvement of the internal structure of the downhole tubular column can be realized, the compressive strength of the downhole tubular column to the wall stress after the improvement is improved, the wall pressure is segmented and isolated through a layered structure, the wall pressure is conveniently and evenly distributed into the external structure, the occurrence of a stress concentration area of the downhole tubular column is reduced, the local accumulated damage generated inside the downhole tubular column is further reduced, and the occurrence of cracks and fractures generated inside the downhole tubular column is reduced, the safety in the oil and gas exploitation process is improved.

Description

Isolated high-pressure-resistance underground pipe column

Technical Field

The utility model relates to an oil gas bores adopts technical field, and more specifically says, relates to a tubular column in pit of high resistance to compression of isolated.

Background

The special equipment for oil gas drilling and production mainly has four faults of damage, aging loosening fault, imbalance fault and performance failure caused by blocking leakage in the fault problems of the mining equipment, which are respectively the problems of cracking and corrosion, strain deformation, cracking, indentation and the like in the aspect of parts, the aging problem is mainly reflected in the phenomena of deterioration, aging, abrasion, peeling and the like in the aspect of materials, and the loosening fault is mainly reflected in the aspects of falling and loosening and the like of parts.

In the drilling process before drilling and production of oil gas, a directional drilling technology is generally adopted to realize multiple holes in one base, multiple holes in one base and multiple purposes in one hole, and the number and the relocation of machines are reduced. By utilizing the directional drilling technology, a plurality of drill holes can be drilled on one base station or a plurality of branch holes can be drilled in one hole, so that the number of the base stations is reduced, road construction and material relocation work are reduced, and the directional drilling method is an effective technical means for realizing green exploration in medium-length hole drilling. Multiple achievements such as successfully developed mechanical continuous whipstocks and the like are applied in the industry. In the project of 'application demonstration of comprehensive drilling technology in a fragile zone of plateau ecological environment' implemented in last two years, a cable-while-drilling/screw motor orientation technology is adopted, drilling of 2 branch holes and three-dimensional orientation crossing an exploration line are respectively completed in 1 drilling hole, and the drilling effect is obvious.

At present, the corrosion monitoring of the conventional underground oil casing adopts a corrosion hanging piece mode and carries out corrosion monitoring based on a weight loss method. For example, chinese patent application No. 201220476848.8 discloses a downhole corrosion monitoring scheme, which includes an annular inner step on the inner wall of the body, and a plurality of inner ring sets on the inner step, which are composed of an inner insulating isolation ring and an inner monitoring ring, and the ring set is capable of monitoring corrosion of the oil pipe and the annular space of the oil jacket at the same time. However, this common weightless corrosion evaluation method is time-consuming and labor-consuming, and the hanger must be taken out from the pit to evaluate the corrosion state, and the change of the corrosion state in the pit cannot be reflected quickly in real time, but because the realization principle of the resistance probe is based on ohm's law, its corrosion resolution is lower, this scheme is more suitable for the monitoring of long-term corrosion, and is not suitable for quick corrosion monitoring, especially the high temperature environment in the pit can lead to the reduction of the micro-resistance measurement accuracy, chinese utility model publication No. CN104458561B discloses a "composite probe for on-line monitoring of pipe column corrosion in the pit", which includes: the probe body is sleeved in the cylindrical shell; the resistance probe comprises a sealing reference element and a sensing element which are connected in series and are made of the same material as the underground pipe column; and an alternating current impedance probe comprising a reference electrode, a working electrode and an auxiliary electrode, and forming an electrochemical three-electrode system; calculating the corrosion allowance of the underground pipe column by acquiring the terminal voltages of a reference element and a sensing element of the resistance probe; the working electrode is loaded with sine wave signals of different frequency points, and the polarization current of the auxiliary electrode and the polarization potential of the reference electrode are synchronously acquired, so that the polarization resistance of the working electrode is obtained, and the corrosion rate can be measured. The utility model also discloses a monitoring devices and monitoring method who has above-mentioned probe. The utility model discloses can realize the quick on-line monitoring of the corrosion rate of oil gas sleeve pipe or tubular column in the pit, be suitable for in the environment of oil, water, the arbitrary mixed medium of gas in the high temperature high pressure environment in the pit.

The technical scheme can carry out on-line monitoring on the corrosion condition of the underground pipe column, by loading sine wave signals with different frequency points on the working electrode and synchronously collecting the polarization current of the auxiliary electrode and the polarization potential of the reference electrode, therefore, the corrosion rate of the underground pipe column is measured, the corrosion caused by the internal monitoring oil pipe and the annular space of the oil sleeve is avoided when the underground pipe column works normally, the inward pressure of the side wall of the casing pipe on the underground pipe column in the drilling and production process is also existed, the damage of the underground pipe column is also easily caused, the inward pressure born by a part of underground pipe columns at the underground deep position is larger, the part of underground pipe columns is easy to generate local permanent accumulated damage under the strain action of the internal stress born by the underground pipe columns along with the increase of the service time, cracks are generated after a certain cycle number, even the complete fracture is suddenly generated, and certain hidden danger is brought to the safety production of oil and gas exploitation.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved

Problem to exist among the prior art, the utility model aims at providing a tubular column in pit of high resistance to compression of isolated, it can realize improving the inner structure of tubular column in pit, promote the compressive strength of tubular column to wall stress in the pit after improving, carry out segmentation isolation to wall pressure through layered structure, be convenient for with in lateral wall pressure balanced distribution to the outer structure, reduce the appearance of tubular column stress concentration district in the pit, and then reduce the inside local accumulative total damage that produces of tubular column in the pit that causes, reduce the inside emergence of crackle and the fracture condition that produces of tubular column in the pit, promote the security among the oil gas exploitation process.

2. Technical scheme

In order to solve the above problems, the utility model adopts the following technical proposal.

An isolated high-pressure-resistance downhole tubular column comprises a downhole tubular column outer tube, wherein a downhole tubular column inner tube is arranged in the downhole tubular column outer tube and is vertically arranged in the downhole tubular column outer tube, an upper eccentric production allocator is arranged on the downhole tubular column inner tube and is sleeved with the upper end of the downhole tubular column inner tube, a first separator is arranged on the lower side of the upper eccentric production allocator and is fixedly connected with the downhole tubular column inner tube, a production allocator plug is fixedly connected with the lower end of the downhole tubular column inner tube, a killing well impact barrel is arranged on the upper side of the production allocator plug, a bottom eccentric production allocator is arranged on the upper side of the killing well impact barrel and is fixedly connected with the downhole tubular column inner tube, a supporting slip is arranged on the upper end of the bottom eccentric production allocator and is sleeved with the downhole tubular column inner tube, and the inner wall of the supporting slip is fixedly connected with the downhole tubular column inner tube, the middle-layer eccentric production allocator and the second separator are arranged between the supporting slips and the first separator and are located on the upper side of the second separator, the middle-layer eccentric production allocator and the second separator are fixedly connected with an underground pipe column inner pipe, the improvement of the internal structure of the underground pipe column can be achieved, the compressive strength of the improved underground pipe column to the wall stress is improved, the wall pressure is isolated in a segmented mode through a layered structure, the wall pressure is distributed into an external structure in a balanced mode conveniently, the occurrence of an underground pipe column stress concentration area is reduced, the caused local accumulated damage generated inside the underground pipe column is reduced, the occurrence of cracks and fracture conditions generated inside the underground pipe column is reduced, and the safety in the oil and gas exploitation process is improved.

Further, be equipped with between tubular column outer tube in the pit and the tubular column inner tube and keep apart the voltage-sharing cavity, be equipped with between first separator and the eccentric production allocator in intermediate level and keep apart the resistance to compression ring, keep apart the resistance to compression ring and be located and keep apart inside the voltage-sharing cavity, keep apart the inner and be connected with tubular column inner tube outer end in the pit, be equipped with between second separator and the support slips and keep apart the resistance to compression ring equally, keep apart the laminating of resistance to compression ring outer end and tubular column outer tube inner wall in the pit, through the isolation resistance to compression ring of setting up in keeping apart the voltage-sharing cavity, the tubular column in the pit of being convenient for separates the pressure-bearing to outside bearing, reduces external pressure and causes the.

Furthermore, keep apart the compression-resistant ring and include that five harmomegathus point post move the briquetting, five harmomegathus point post moves and is equipped with two between the briquetting and separate the pressure-bearing ring post, separate pressure-bearing ring post and harmomegathus point post and move briquetting fixed connection, two harmomegathus point post moves and is equipped with plunger shunt casing between the briquetting, plunger shunt casing cup joints with two separation pressure-bearing ring posts, and plunger shunt casing and separation pressure-bearing ring post keep away from harmomegathus point post and move briquetting one end sliding connection, through separating pressure-bearing ring post and plunger shunt casing of addding between harmomegathus point post moves the briquetting, is convenient for when harmomegathus point post moves the briquetting and bears external pressure, with pressure conduction to inside separating pressure-bearing ring post and plunger shunt casing.

Further, the expansion and contraction point post moves the briquetting and is close to two commentaries on classics pressure alloy extension strips of tubular column inner tube one end fixedly connected with in the pit, the expansion and contraction point post moves the briquetting and keeps away from tubular column outer tube one end in the pit and is equipped with epitaxial lock base plate, epitaxial lock base plate inner and tubular column inner tube fixed connection in the pit, it has the fluid reservoir to open in the middle of the epitaxial lock base plate, it has a hole of accepting to open on the epitaxial lock base plate, it runs through accepts a hole and epitaxial lock base plate sliding connection to change pressure alloy extension strip lower extreme, through moving the commentaries on classics pressure alloy that the briquetting inboard was add at the expansion and contraction point post and extending strip and epitaxial lock base plate, be convenient for conduct external pressure to epitaxial lock base plate and change and.

Furthermore, the extension buckling substrate is internally filled with a sealing magnetic fluid, the sealing magnetic fluid is filled in a fluid reservoir inside the extension buckling substrate, and the sealing magnetic fluid filled inside the extension buckling substrate is convenient for reducing the damage to the inner wall of the extension buckling substrate when the pressure-transferring alloy stretching strip slides in the extension buckling substrate and simultaneously reducing the pressure when the pressure-transferring alloy stretching strip moves.

Further, the expansion and contraction point column moves the driven laminating fixture block of briquetting outer end fixedly connected with, the laminating of driven laminating fixture block outer end and tubular column outer tube inner wall in the pit through the driven laminating fixture block that moves the briquetting outside and add at the expansion and contraction point column, is convenient for reduce the pressure damage that moves the briquetting to the expansion and contraction point column when tubular column outer tube takes place to deform in the pit.

Further, driven laminating fixture block outer end fixedly connected with model force bristle layer, driven laminating fixture block one end fixedly connected with toughness cellosilk is kept away from to model force bristle layer, toughness cellosilk is closely arranged in driven laminating fixture block outer end, through model force bristle layer and the toughness cellosilk of addding in driven laminating fixture block outer end, is convenient for make driven laminating fixture block remain throughout with the laminating state of tubular column outer tube inner wall in the pit, is convenient for reduce to move the briquetting and produce the collision damage to driven laminating fixture block and harmomegathus point post after driven laminating fixture block and tubular column outer tube produce the clearance in the pit.

Furthermore, the main components of the sealed magnetic fluid comprise magnetic particles and free liquid matrixes, and the magnetic particles and the free liquid matrixes are uniformly distributed in the epitaxial buckling substrate.

Furthermore, after the underground pipe column inner pipe, the upper layer eccentric production allocator, the first separator, the middle layer eccentric production allocator, the second separator, the supporting slips and the bottom layer eccentric production allocator in the underground pipe column outer pipe are installed, a technician detects the flow of the underground pipe column inner pipe, and the flow in the underground pipe column inner pipe, the upper layer eccentric production allocator, the first separator, the middle layer eccentric production allocator, the second separator, the supporting slips and the bottom layer eccentric production allocator in the underground pipe column outer pipe is convenient to confirm whether the flow in the underground pipe column inner pipe meets the standard or not.

Furthermore, the upper eccentric production allocator, the first separator, the middle eccentric production allocator, the second separator, the supporting slips and the bottom eccentric production allocator are all arranged at positions adjacent to the underground oil separation layer when being installed, and the upper eccentric production allocator, the first separator, the middle eccentric production allocator, the second separator, the supporting slips and the bottom eccentric production allocator are installed at positions adjacent to the underground oil separation layer, so that the flow of the underground pipe column inner pipe is limited at the position with high oil pressure.

3. Advantageous effects

Compared with the prior art, the utility model has the advantages of:

(1) this scheme can realize improving the inner structure of tubular column in the pit, promote the compressive strength of tubular column to the lateral wall stress in the pit after improving, carry out the segmentation through layered structure to lateral wall pressure and keep apart, be convenient for with lateral wall pressure balanced distribution to the outer structure in, reduce the appearance of tubular column stress concentration district in the pit, and then reduce the inside local accumulative total damage that produces of tubular column in the pit that leads to the fact, reduce the inside emergence that produces crackle and the fracture condition of tubular column in the pit, promote the security among the oil and gas exploitation process.

(2) Be equipped with between tubular column outer tube in the pit and the tubular column inner tube in the pit and keep apart the voltage-sharing cavity, be equipped with between first separator and the eccentric bottom-up tool in intermediate level and keep apart the resistance to compression ring, keep apart the resistance to compression ring and be located inside keeping apart the voltage-sharing cavity, keep apart the inner and be connected with tubular column inner tube outer end in the pit, the second separator is equipped with between the slips and keeps apart the resistance to compression ring equally, keep apart the laminating of resistance to compression ring outer end and tubular column outer tube inner wall in the pit, through the isolation resistance to compression ring of setting up in keeping apart the voltage-sharing cavity, the tubular column in the pit of being convenient for separates the pressure-.

(3) The isolation compression ring comprises five expansion and contraction point column moving pressing blocks, two separation pressure-bearing ring columns are arranged between the five expansion and contraction point column moving pressing blocks, the separation pressure-bearing ring columns are fixedly connected with the expansion and contraction point column moving pressing blocks, a plunger shunting sleeve is arranged between the two expansion and contraction point column moving pressing blocks, the plunger shunting sleeve is sleeved with the two separation pressure-bearing ring columns, the plunger shunting sleeve and the separation pressure-bearing ring columns are connected with one end, away from the expansion and contraction point column moving pressing blocks, of the plunger shunting sleeve in a sliding mode, and the separation pressure-bearing ring columns and the plunger shunting sleeve are additionally arranged between the expansion and contraction point column moving pressing blocks, so that when the expansion and contraction point column moving pressing blocks bear external pressure, the pressure is conducted to the interior of the.

(4) The expansion point column moves the briquetting and is close to two commentaries on classics pressure alloy extension strips of tubular column inner tube one end fixedly connected with in the pit, the expansion point column moves the briquetting and keeps away from tubular column outer tube one end in the pit and is equipped with epitaxial lock base plate, epitaxial lock base plate inner and tubular column inner tube fixed connection in the pit, it has the fluid reservoir to open in the middle of the epitaxial lock base plate, open at epitaxial lock base plate upper end and have accepted a hole, it runs through and accepts a hole and epitaxial lock base plate sliding connection to change pressure alloy extension strip lower extreme, it extends strip and epitaxial lock base plate to move the commentaries on classics pressure alloy that the briquetting inboard was add at the expansion point column, be convenient for conduct external pressure to between epitaxial lock base.

(5) The extension buckling substrate is internally filled with the sealing magnetic fluid, the sealing magnetic fluid is filled in the fluid reservoir inside the extension buckling substrate, and the sealing magnetic fluid filled inside the extension buckling substrate is convenient for reducing the damage to the inner wall of the extension buckling substrate when the pressure-transferring alloy stretching strip slides in the extension buckling substrate and simultaneously reducing the pressure when the pressure-transferring alloy stretching strip moves.

(6) The outer end of the expansion point column moving pressing block is fixedly connected with a driven laminating fixture block, the outer end of the driven laminating fixture block is laminated with the inner wall of the outer pipe of the underground pipe column, and pressure damage to the expansion point column moving pressing block when the outer pipe of the underground pipe column deforms is reduced conveniently through the driven laminating fixture block additionally arranged outside the expansion point column moving pressing block.

(7) Driven laminating fixture block outer end fixedly connected with norm bristle layer, driven laminating fixture block one end fixedly connected with toughness cellosilk is kept away from to the norm bristle layer, toughness cellosilk is closely arranged in driven laminating fixture block outer end, through norm bristle layer and the toughness cellosilk of addding in driven laminating fixture block outer end, be convenient for make driven laminating fixture block remain throughout with the laminating state of tubular column outer tube inner wall in the pit, be convenient for reduce to move the briquetting to driven laminating fixture block and harmfulness point post and produce the collision damage after driven laminating fixture block and tubular column outer tube production clearance in the pit.

(8) After the underground pipe column inner pipe, the upper layer eccentric production allocator, the first separator, the middle layer eccentric production allocator, the second separator, the supporting slips and the bottom layer eccentric production allocator in the underground pipe column outer pipe are installed, a technician detects the flow of the underground pipe column inner pipe, and whether the flow in the underground pipe column inner pipe meets the standard or not is conveniently confirmed by the underground pipe column inner pipe, the upper layer eccentric production allocator, the first separator, the middle layer eccentric production allocator, the second separator, the supporting slips and the bottom layer eccentric production allocator in the underground pipe column outer pipe.

(9) When being installed, the upper eccentric production allocator, the first separator, the middle eccentric production allocator, the second separator, the supporting slips and the bottom eccentric production allocator are all arranged at positions adjacent to the underground oil separation layer, and the upper eccentric production allocator, the first separator, the middle eccentric production allocator, the second separator, the supporting slips and the bottom eccentric production allocator are arranged at positions close to the underground oil separation layer, so that the flow of an inner pipe of the underground pipe column at the position with larger oil pressure is reduced and limited.

Drawings

FIG. 1 is a longitudinal cross-sectional view of a high pressure resistant downhole tubular string in accordance with the present invention;

FIG. 2 is a transverse cross-sectional view of the high pressure resistant downhole string of the present invention;

FIG. 3 is a schematic view of the structure at A in FIG. 2;

fig. 4 is a schematic structural diagram of the separated pressure-bearing ring part of the present invention.

The reference numbers in the figures illustrate:

the device comprises a downhole tubular column outer tube 1, an upper layer eccentric production allocator 2, a first separator 3, a middle layer eccentric production allocator 4, a second separator 5, a supporting slip 6, a bottom layer eccentric production allocator 7, a killing well impacting barrel 8, a production allocator plug 9, a downhole tubular column inner tube 10, an expansion and contraction point column shifting press block 11, a driven welting press block 12, a separation pressure-bearing ring column 13, a plunger split sleeve 14, an extension buckling base plate 15, a pressure-transferring alloy extending strip 16 and an isolation pressure-equalizing cavity 17.

Detailed Description

The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", 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 element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are used in a broad sense, and for example, "connected," may be fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or connected between two elements.

Example 1:

referring to fig. 1-4, an isolated high pressure resistant downhole string comprises an external downhole string tube 1, an internal downhole string tube 10 is arranged inside the external downhole string tube 1, the internal downhole string tube 10 is vertically arranged inside the external downhole string tube 1, an upper eccentric production allocator 2 is arranged on the internal downhole string tube 10, the upper eccentric production allocator 2 is sleeved with the upper end of the internal downhole string tube 10, a first separator 3 is arranged on the lower side of the upper eccentric production allocator 2, the first separator 3 is fixedly connected with the internal downhole string tube 10, a production allocator plug 9 is fixedly connected with the lower end of the internal downhole string tube 10, a kill impact cylinder 8 is arranged on the upper side of the production allocator plug 9, a bottom eccentric production allocator 7 is arranged on the upper side of the kill impact cylinder 8, the bottom eccentric production allocator 7 is fixedly connected with the internal downhole string tube 10, a support slip 6 is arranged on the upper end of the bottom eccentric production allocator 7, the support slip 6 is sleeved with the internal downhole string tube 10, the inner wall of the supporting slip 6 is fixedly connected with an underground pipe column inner pipe 10, a middle-layer eccentric production allocator 4 and a second separator 5 are arranged between the supporting slip 6 and the first separator 3, the middle-layer eccentric production allocator 4 is positioned on the upper side of the second separator 5, the middle-layer eccentric production allocator 4 and the second separator 5 are fixedly connected with the underground pipe column inner pipe 10, the improvement of the internal structure of the underground pipe column can be realized, the compressive strength of the improved underground pipe column to the wall stress is improved, the wall pressure is isolated in a segmented mode through a layered structure, the wall pressure is conveniently and uniformly distributed into an external structure, the occurrence of an underground pipe column stress concentration area is reduced, the caused local accumulated damage generated inside the underground pipe column is reduced, the occurrence of cracks and fracture conditions generated inside the underground pipe column is reduced, and the safety in the oil and gas exploitation process is improved.

Referring to fig. 2, an isolation pressure-equalizing cavity 17 is formed between an underground pipe column outer pipe 1 and an underground pipe column inner pipe 10, an isolation pressure-resisting ring is arranged between a first separator 3 and a middle-layer eccentric production allocator 4 and located inside the isolation pressure-equalizing cavity 17, the inner end of the isolation pressure-resisting ring is connected with the outer end of the underground pipe column inner pipe 10, an isolation pressure-resisting ring is also arranged between a second separator 5 and a supporting slip 6, the outer end of the isolation pressure-resisting ring is attached to the inner wall of the underground pipe column outer pipe 1, and the isolation pressure-resisting ring is additionally arranged in the isolation pressure-equalizing cavity 17 to facilitate the separation and pressure bearing of the underground pipe column on the outer part, so that the damage of external pressure to the inner underground.

Referring to fig. 3, the isolation compression ring includes five compression point column shift blocks 11, two separation pressure-bearing rings 13 are disposed between the five compression point column shift blocks 11, the separation pressure-bearing rings 13 are fixedly connected to the compression point column shift blocks 11, a plunger shunt sleeve 14 is disposed between the two compression point column shift blocks 11, the plunger shunt sleeve 14 is sleeved with the two separation pressure-bearing rings 13, and the plunger shunt sleeve 14 is slidably connected to one end of the separation pressure-bearing rings 13 far from the compression point column shift blocks 11, so that when the compression point column shift blocks 11 bear external pressure, the pressure is conveniently transmitted to the interior of the separation pressure-bearing rings 13 and the plunger shunt sleeve 14.

Referring to fig. 3, two pressure-transferring alloy extending strips 16 are fixedly connected to one end of the collapsible point column moving pressing block 11 close to the inner pipe 10 of the downhole tubular column, an extending fastening substrate 15 is arranged at one end of the collapsible point column moving pressing block 11 far from the outer pipe 1 of the downhole tubular column, the inner end of the extending fastening substrate 15 is fixedly connected with the inner pipe 10 of the downhole tubular column, a fluid reservoir is dug in the middle of the extending fastening substrate 15, a receiving strip hole is dug at the upper end of the extending fastening substrate 15, the lower end of the pressure-transferring alloy extending strip 16 penetrates through the receiving strip hole to be slidably connected with the extending fastening substrate 15, and external pressure can be conveniently transferred between the extending fastening substrate 15 and the pressure-transferring alloy extending strips 16 by the pressure-transferring alloy extending strip 16 and the extending fastening substrate 15 which.

Referring to fig. 3, the sealing magnetic fluid is filled in the extending fastening substrate 15, the sealing magnetic fluid is filled in the fluid reservoir in the extending fastening substrate 15, and the sealing magnetic fluid filled in the extending fastening substrate 15 is convenient to reduce the damage to the inner wall of the extending fastening substrate 15 when the pressure-transferring alloy extension strip 16 slides in the extending fastening substrate 15, and simultaneously reduce the pressure when the pressure-transferring alloy extension strip 16 moves.

Referring to fig. 3, the outer end of the expansion and contraction point column moving pressing block 11 is fixedly connected with a driven fitting fixture block 12, the outer end of the driven fitting fixture block 12 is fitted with the inner wall of the downhole column outer tube 1, and the driven fitting fixture block 12 additionally arranged outside the expansion and contraction point column moving pressing block 11 is convenient for reducing pressure damage to the expansion and contraction point column moving pressing block 11 when the downhole column outer tube 1 deforms.

Please refer to fig. 3, the outer end of the driven fitting fixture block 12 is fixedly connected with a normal force bristle layer, the normal force bristle layer is far away from one end of the driven fitting fixture block 12 and is fixedly connected with a tough filament, the tough filament is closely arranged at the outer end of the driven fitting fixture block 12, and through the normal force bristle layer and the tough filament additionally arranged at the outer end of the driven fitting fixture block 12, the driven fitting fixture block 12 is convenient to be always kept in a fitting state with the inner wall of the outer pipe 1 of the downhole tubular column, so as to reduce the collision damage generated on the driven fitting fixture block 12 and the expansion and contraction point column shifting press block 11 after the gap is generated between the driven fitting fixture block 12 and.

The main components of the sealed magnetic fluid comprise magnetic particles and free liquid matrix, and the magnetic particles and the free liquid matrix are uniformly distributed in the epitaxial buckling substrate 15.

Referring to fig. 1, after the downhole string inner tube 10, the upper eccentric production allocator 2, the first separator 3, the middle eccentric production allocator 4, the second separator 5, the supporting slip 6 and the bottom eccentric production allocator 7 in the downhole string outer tube 1 are installed, a technician detects the flow rate of the downhole string inner tube 10, and the flow rate in the downhole string inner tube 10, the upper eccentric production allocator 2, the first separator 3, the middle eccentric production allocator 4, the second separator 5, the supporting slip 6 and the bottom eccentric production allocator 7 in the downhole string outer tube 1 is convenient to confirm whether the flow rate in the downhole string inner tube 10 meets the standard or not.

Referring to fig. 1, when being installed, the upper eccentric production allocator 2, the first separator 3, the middle eccentric production allocator 4, the second separator 5, the supporting slips 6 and the bottom eccentric production allocator 7 are all arranged at positions adjacent to the underground oil separation layer, and the upper eccentric production allocator 2, the first separator 3, the middle eccentric production allocator 4, the second separator 5, the supporting slips 6 and the bottom eccentric production allocator 7 are arranged at positions adjacent to the underground oil separation layer, so that the flow of the downhole tubular column inner pipe 10 is limited at a position with high oil pressure.

The utility model discloses can realize improving the inner structure of tubular column in the pit, promote the compressive strength of tubular column to the lateral wall stress in the pit after improving, carry out segmentation isolation to the lateral wall pressure through layered structure, be convenient for with lateral wall pressure balanced distribution to the exterior structure in, reduce the appearance of tubular column stress concentration district in the pit, and then reduce the inside local accumulative total damage that produces of tubular column in the pit that causes, reduce the inside emergence that produces crackle and the fracture condition of tubular column in the pit, promote the security among the oil and gas exploitation process.

The above description is only the preferred embodiment of the present invention; the scope of the present invention is not limited thereto. Any person skilled in the art should also be able to cover the technical scope of the present invention by replacing or changing the technical solution and the improvement concept of the present invention with equivalents and modifications within the technical scope of the present invention.

Claims (8)

1. The utility model provides a tubular column in pit of high resistance to compression of isolated which characterized in that: comprises a downhole tubular column outer pipe (1), a downhole tubular column inner pipe (10) is arranged in the downhole tubular column outer pipe (1), the downhole tubular column inner pipe (10) is vertically arranged in the downhole tubular column outer pipe (1), an upper eccentric production allocator (2) is arranged on the downhole tubular column inner pipe (10), the upper eccentric production allocator (2) is sleeved with the upper end of the downhole tubular column inner pipe (10), a first separator (3) is arranged on the lower side of the upper eccentric production allocator (2), the first separator (3) is fixedly connected with the downhole tubular column inner pipe (10), a production allocator plug (9) is fixedly connected with the lower end of the downhole tubular column inner pipe (10), a kill tube (8) is arranged on the upper side of the production allocator plug (9), a bottom eccentric production allocator (7) is arranged on the upper side of the kill tube (8), and the bottom eccentric production allocator (7) is fixedly connected with the downhole tubular column inner pipe (10), the bottom layer eccentric production allocator is characterized in that a supporting slip (6) is arranged at the upper end of the bottom layer eccentric production allocator (7), the supporting slip (6) is sleeved with the underground pipe column inner pipe (10), the inner wall of the supporting slip (6) is fixedly connected with the underground pipe column inner pipe (10), a middle layer eccentric production allocator (4) and a second separator (5) are arranged between the supporting slip (6) and the first separator (3), the middle layer eccentric production allocator (4) is located on the upper side of the second separator (5), and the middle layer eccentric production allocator (4) and the second separator (5) are fixedly connected with the underground pipe column inner pipe (10).

2. The isolated high pressure resistant downhole string of claim 1, wherein: be equipped with between tubular column outer tube in the pit (1) and tubular column inner tube in the pit (10) and keep apart voltage-sharing cavity (17), be equipped with between first separator (3) and the eccentric bottom match-up tool in well layer (4) and keep apart the resistance to compression ring, keep apart the resistance to compression ring and be located inside keeping apart voltage-sharing cavity (17), keep apart the resistance to compression ring inner and be connected with tubular column inner tube in the pit (10) outer end, second separator (5) and support slips (6) between be equipped with the isolation resistance to compression ring equally, keep apart the resistance to compression ring outer end and laminate with tubular column outer tube in the pit (1) inner wall.

3. The isolated high pressure resistant downhole string of claim 2, wherein: keep apart the compression-resisting ring and move briquetting (11), five including five harmomegathus point post be equipped with two between the harmomegathus point post moves briquetting (11) and separate pressure-bearing ring post (13), separate pressure-bearing ring post (13) and harmomegathus point post and move briquetting (11) fixed connection, two the harmomegathus point post moves and is equipped with plunger split-flow sleeve (14) between briquetting (11), plunger split-flow sleeve (14) and two separate pressure-bearing ring post (13) and cup joint, and plunger split-flow sleeve (14) with separate pressure-bearing ring post (13) and keep away from harmomegathus point post and move briquetting (11) one end sliding connection.

4. The isolated high pressure resistant downhole string of claim 3, wherein: the utility model discloses a tubular column expansion and contraction point post is including the expansion and contraction point post moves briquetting (11) and is close to two commentaries on classics pressure alloy extension strip (16) of tubular column inner tube (10) one end fixedly connected with in the pit, the expansion and contraction point post moves briquetting (11) and keeps away from tubular column outer tube (1) one end in the pit and is equipped with epitaxial lock base plate (15), epitaxial lock base plate (15) inner and tubular column inner tube (10) fixed connection in the pit, it has the fluid reservoir to open in the middle of epitaxial lock base plate (15), open on epitaxial lock base plate (15) and have accepted a hole, it runs through and accepts a hole and epitaxial lock base plate (15) sliding connection to change pressure alloy extension strip (16.

5. The isolated high pressure resistant downhole string of claim 4, wherein: and the extension buckling substrate (15) is internally filled with a sealing magnetic fluid, and the sealing magnetic fluid is filled in a fluid reservoir in the extension buckling substrate (15).

6. The isolated high pressure resistant downhole string of claim 4, wherein: the outer end of the expansion point column moving pressing block (11) is fixedly connected with a driven laminating clamping block (12), and the outer end of the driven laminating clamping block (12) is laminated with the inner wall of the underground column outer tube (1).

7. The isolated high pressure resistant downhole string of claim 6, wherein: the outer end of the driven fitting fixture block (12) is fixedly connected with a normal force bristle layer, one end, far away from the driven fitting fixture block (12), of the normal force bristle layer is fixedly connected with tough fibers, and the tough fibers are closely arranged at the outer end of the driven fitting fixture block (12).

8. The isolated high pressure resistant downhole string of claim 5, wherein: the main components of the sealed magnetic fluid comprise magnetic particles and free liquid matrixes, and the magnetic particles and the free liquid matrixes are uniformly distributed in the epitaxial buckling substrate (15).

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