CN216665514U - Well completion pipe string of long horizontal well of dense gas - Google Patents

Abstract

The utility model discloses a compact gas long horizontal well completion pipe column which comprises a first pipe column vertically arranged in a well, wherein a suspension sleeve is sleeved at the lower end of the first pipe column through threads, a fastening assembly used for fixing the first pipe column in the well and a sealing assembly used for sealing other parts except a working channel in the first pipe column in the well are arranged on the suspension sleeve, and the parts of the fastening assembly and the sealing assembly are driven by the thread feeding action between the first pipe column and the suspension sleeve. The fastening assembly and the sealing assembly are arranged and are driven by the thread feeding action between the first pipe column and the suspension sleeve, so that the first pipe column can be directly driven to rotate from the outside of the well, the suspension sleeve is conveniently fixed in the well, and meanwhile, the part, which is positioned at the lower side of the suspension sleeve and is removed from a working channel in the first pipe column, in the well is sealed, oil gas is prevented from leaking, and the ground surface environment is protected from being polluted.

Description

Well completion pipe string of long horizontal well of dense gas

Technical Field

The utility model relates to the technical field of oil and gas exploitation, in particular to a completion pipe string of a compact gas long horizontal well.

Background

The well completion refers to a process of communicating a well bottom and an oil layer in a certain structure after an open hole well reaches a designed well depth, the well completion is an important last link of well drilling work and is also the beginning of an oil extraction project, the production capacity and the economic life of an oil well are directly influenced by the quality of the well completion of the oil well, even whether the whole oil field can be reasonably developed is related, the horizontal well is suitable for a thin oil-gas layer or a fractured oil-gas reservoir and aims to increase the exposed area of the oil-gas layer, the existing well completion pipe column can basically meet the use requirement of the horizontal well for compact gas exploitation, and certain defects still need to be improved.

Patent document CN213928257U provides a long horizontal well completion tubular column of shale gas, including the sleeve pipe, the sleeve pipe is including the surface casing that can registrate in proper order, middle sleeve pipe and production casing, surface casing is located outermost, surface casing, the length of middle casing and production casing increases in proper order, surface casing, middle casing and production casing homoenergetic extend to the earth's surface, production casing can extend to the horizontal well shaft bottom, the tip fixedly connected with toe end sliding sleeve that the production casing is close to the shaft bottom, toe end sliding sleeve can open under external pressure. According to the scheme, the toe end sliding sleeve is mounted on the production casing, so that the problems that in the prior art, the shale gas long horizontal well is long in construction time, complex in construction, high in cost and high in construction difficulty due to the fact that the coiled tubing is adopted to complete the first-segment perforation are solved.

In the tubular column installation in the horizontal well, the steadiness ability of tubular column and the sealing performance between tubular column and the well are especially important, and the tubular column of horizontal well installation does not have the straight setting like the tubular column of shaft installation, and it has one section crooked tubular column part, therefore, tubular column installation operation in the horizontal well is inconvenient, and sealing performance is difficult for obtaining the assurance, consequently needs a long horizontal well completion tubular column of dense gas to solve above-mentioned problem urgently.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a compact gas long horizontal well completion pipe string to solve the problems in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a long horizontal well completion tubular column of dense gas, includes the vertical first tubular column that sets up in the well, first tubular column lower extreme screw thread sleeve has been provided with the suspension cover, be provided with on the suspension cover and be used for itself in the well fixed fastening components and be used for sealing the well except the sealing component of first tubular column interior working channel other parts, fastening components group and sealing component's part are driven by the screw feed effect between first tubular column and the suspension cover, suspension cover lower extreme is connected with horizontally third tubular column through crooked second tubular column.

Preferably, the fastening assembly comprises a plurality of supporting blocks which are arranged on the suspension sleeve in a penetrating and sliding mode, the end parts, close to the suspension sleeve, of the supporting blocks are arranged to be trapezoidal bodies, the lower end of the first pipe column is arranged to be a cone matched with the trapezoidal bodies, and the trapezoidal bodies and the cone are arranged in a wedge-shaped matched mode.

Preferably, the lower end of the cone is provided with an external thread body, and an internal thread groove matched with the external thread body is arranged in the suspension sleeve.

Preferably, the seal assembly comprises a seal cartridge disposed on the hanger sleeve, the seal cartridge being in interference fit with the well.

Preferably, the first pipe column is provided with a sealing ring, the sealing barrel is internally provided with a sliding groove matched with the sealing ring, the bottom surface in the sliding groove is provided with a rubber ring, the sealing ring is kept in the sliding groove, and when the sealing ring is moved and pressed down, a movable gap between the first pipe column and the sealing barrel can be sealed.

Preferably, the upper end of the first pipe column is sleeved with a positioning sleeve, and the positioning sleeve is communicated with the ground foot bolt assembly and fixed on the ground.

Preferably, the suspension sleeve and the second pipe column and the third pipe column are fixedly connected through flanges and bolt assemblies.

Preferably, the third tubular column is of a barrel structure with a slit on the surface, and the free end far away from the second tubular column is provided with a cone shape.

Preferably, the third pipe column is fixedly sleeved with a support ring, a plurality of rolling grooves are symmetrically formed in the circumference of the support ring, balls are movably arranged in the rolling grooves, and the third pipe column moves in the well and drives the balls to generate rolling friction with the inner wall of the well.

Compared with the prior art, the utility model has the beneficial effects that:

this long horizontal well completion tubular column of dense gas is through setting up fastening components and seal assembly, and by first tubular column and hang the screw feeding effect drive between the cover, make can directly rotate from the first tubular column of extramural drive, and convenient will hang the cover and fix in the well, and then make the second tubular column of being connected with hanging the cover support with the third tubular column and stabilize in order to carry out work in the well, and simultaneously, the part that lies in hanging the cover downside and detach working channel in the first tubular column in the well is all sealed, oil gas has been prevented to spill, the protection earth's surface environment does not receive the pollution.

Drawings

FIG. 1 is a schematic sectional front view of a suspension housing of the present invention;

FIG. 2 is a schematic view of the front cross-section of the hanging sleeve of the present invention when it is not fixed;

FIG. 3 is a schematic top cross-sectional view of a first tubular string in accordance with the present invention;

FIG. 4 is a schematic side sectional view of a third tubular string in accordance with the present invention;

fig. 5 is an enlarged schematic view of the structure at a in fig. 1 according to the present invention.

In the figure: 1. a first tubular string; 2. hanging a sleeve; 3. a second tubular string; 4. a third tubular string; 5. a support block; 6. A trapezoidal body; 7. a cone; 8. an external thread body; 9. an internal thread groove; 10. a sealing cylinder; 11. a seal ring; 12. A sliding groove; 13. a rubber ring; 14. a positioning sleeve; 15. a support ring; 16. rolling a groove; 17. and a ball.

Detailed Description

The technical solution in the embodiment of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiment of the present invention, and referring to fig. 1 to 5, the completion string for a tight gas long horizontal well provided in the embodiment of the present invention includes a first string 1 vertically disposed in a well, a suspension sleeve 2 threadedly sleeved on a lower end of the first string 1, a fastening assembly for fixing the suspension sleeve 2 in the well and a sealing assembly for sealing other parts of the well except for a working channel in the first string 1, wherein the fastening assembly and the sealing assembly are driven by a thread feeding action between the first string 1 and the suspension sleeve 2, and a horizontal third string 4 is connected to a lower end of the suspension sleeve 2 through a bent second string 3.

Specifically, the well is a circular well and comprises a vertical part, a horizontal part and a bending part for connecting the vertical part and the horizontal part, the first pipe column 1 is arranged in the vertical part in the well, the second pipe column 3 can be bent and deformed and is arranged in the bending part in the well, and the actual curvature radius of the bending part of the well is far larger than that shown in figure 1, so that the third pipe column 4 can smoothly pass through the bending part of the well and enter the horizontal part of the well; the upper end of the first pipe column 1 can drive the first pipe column 1 to rotate by means of torque equipment, and the torque equipment can be a rotary table or a motor and the like; the outer diameter of the suspension sleeve 2 is not larger than the inner diameter of the well and is equal to the outer diameter of the first pipe column 1; the fastening component is used for fixing the suspension sleeve 2 in the well by spreading and extruding towards the inner wall of the well; one part of the sealing assembly is used for sealing the outer wall of the suspension sleeve 2 and the inner wall of the well, and the other part is used for sealing a movable gap between the suspension sleeve 2 and the first pipe column 1. In practical use, the first pipe column 1, the suspension sleeve 2, the second pipe column 3 and the third pipe column 4 are connected into a whole, the third pipe column 4 is required to be put into a well in sequence from the third pipe column 4, and the structure can be known, the third pipe column 4 can smoothly pass through the bent part of the well and enter the horizontal part of the well, then the second pipe column 3 is bent and deformed and enters the bent part of the well, the suspension sleeve 2 and the first pipe column 1 sequentially enter the vertical part of the well, when the suspension sleeve 2 is positioned at a proper height in the well, the first pipe column 1 is driven to rotate through torque equipment, at the moment, the suspension sleeve 2 is limited by the second pipe column 3 and the third pipe column 4 and cannot be driven to rotate by the first pipe column 1, so that the first pipe column 1 and the suspension sleeve 2 have a thread feeding effect to drive a fastening component to fix the suspension sleeve 2 in the well, and further the second pipe column 3 and the third pipe column 4 are supported and stabilized in the well to work, meanwhile, the thread feeding effect between the first pipe column 1 and the suspension sleeve 2 also drives the sealing assembly to seal the part of the well which is positioned at the lower side of the suspension sleeve 2 and is removed from the working channel in the first pipe column 1, so that oil gas is prevented from leaking, and the ground surface environment is protected from being polluted.

Compared with the prior art, the tight gas long horizontal well completion pipe column provided by the embodiment of the utility model is provided with the fastening component and the sealing component, and is driven by the screw feeding action between the first pipe column 1 and the suspension sleeve 2, so that the first pipe column 1 can be directly driven to rotate from the outside of the well, the suspension sleeve 2 is conveniently fixed in the well, the second pipe column 3 and the third pipe column 4 connected with the suspension sleeve 2 are supported and stabilized in the well to work, and meanwhile, the part of the well, which is positioned at the lower side of the suspension sleeve 2 and is removed from a working channel in the first pipe column 1, is sealed, so that oil gas is prevented from leaking, and the ground surface environment is protected from being polluted.

As a preferred technical scheme of the embodiment, the fastening assembly comprises a plurality of supporting blocks 5 which are arranged on the suspension sleeve 2 in a penetrating and sliding manner, the end parts of the supporting blocks 5, which are close to the interior of the suspension sleeve 2, are provided with trapezoidal bodies 6, the lower end of the first pipe column 1 is provided with a cone 7 matched with the trapezoidal bodies 6, the trapezoidal bodies 6 and the cone 7 are arranged in a wedge-shaped matching manner, and specifically, the end parts of the supporting blocks 5, which are far away from the trapezoidal bodies 6, are provided with irregular protrusions, so that when the irregular protrusions are in pressing contact with the inner wall of a well, larger resistance can be provided, and the suspension sleeve 2 is guaranteed to be supported and fixed in the well; because the trapezoidal body 6 cooperates with the cone 7 wedge, when the first tubular column 1 drives the cone 7 to move down, the trapezoidal body 6 can be pushed to move towards the outer direction of the hanging sleeve 2, and the trapezoidal body 6 drives the supporting block 5 to be outwards expanded and extruded on the inner wall of the well, so that the hanging sleeve 2 is fixed in the well.

As the preferred technical scheme of this embodiment, the cone 7 lower extreme is provided with the external screw thread body 8, hangs and is provided with in the cover 2 with external screw thread body 8 assorted internal thread groove 9, specifically, external screw thread body 8 and internal thread groove 9's setting for when taking place relative rotation between first tubular column 1 and the hanging cover 2, can take place the screw thread feeding effect, and then make first tubular column 1 and hang and take place relative movement from top to bottom between the cover 2, even first tubular column 1 can drive fastening components.

In another embodiment of the present invention, the sealing assembly includes a sealing cylinder 10 disposed on the suspension sleeve 2, the sealing cylinder 10 is in interference fit with the well, and specifically, the sealing cylinder 10 is disposed in interference fit with the well, so that a gap between the suspension sleeve 2 and an inner wall of the well is sealed by blocking; when the suspension sleeve 2 is installed in a well, large downward pressure is needed, and the suspension sleeve can be driven by a pile driver or hydraulically pressurized.

As a preferred technical solution of this embodiment, a sealing ring 11 is disposed on the first pipe string 1, a sliding groove 12 matched with the sealing ring 11 is disposed in the sealing cylinder 10, a rubber ring 13 is disposed on a bottom surface in the sliding groove 12, the sealing ring 11 is kept in the sliding groove 12, and when the sealing ring 11 is moved and pressed down, a movable gap between the first pipe string 1 and the sealing cylinder 10 can be sealed, specifically, when the first pipe string 1 moves down in the hanging sleeve 2, the sealing ring 11 is driven to move down in the sliding groove 12, and when the sealing ring 11 moves to press down on the rubber ring 13, the movable gap between the first pipe string 1 and the hanging sleeve 2 is blocked and sealed at a position where the sealing ring 11 is in close contact with the rubber ring 13.

In another embodiment of the present invention, a positioning sleeve 14 is sleeved on the upper end of the first tubular column 1, the positioning sleeve 14 is fixed on the ground through a foundation bolt assembly, specifically, after the first tubular column 1 is installed in a well, the foundation bolt assembly includes a base fixed on the ground, a plurality of foundation bolts are arranged on the base, and through holes matched with the foundation bolts are arranged on the positioning sleeve 14, when the positioning sleeve 14 is installed, the positioning sleeve 14 is sleeved on the first tubular column 1, and the through holes on the positioning sleeve vertically correspond to the foundation bolts, then the positioning sleeve 14 is moved downward to be attached to the base, and the foundation bolts pass through the through holes, and then the positioning sleeve 14 is fastened by connecting the positioning sleeve 14 to the foundation bolts through nuts and threads, at this time, the positioning sleeve 14 can stabilize the vertical position of the first tubular column 1, and ensure that the first tubular column 1 stably rotates.

In another embodiment of the present invention, the suspension sleeve 2 and the second tubular string 3 and the third tubular string 4 are fixedly connected by a flange and a bolt assembly, and specifically, the outer diameter of the flange is not larger than the inner diameter of the well, so that the second tubular string 3 and the third tubular string 4 are not prevented from entering the well.

In another embodiment of the present invention, the third tubular column 4 is a cylindrical structure with a slit on the surface, and the free end far away from the second tubular column 3 is set to be conical, specifically, the slit cylindrical structure is set, so that the third tubular column 4 has a channel for oil gas circulation; the provision of the tapered free end allows the third tubular string 4 to be moved within the well without being obstructed by the inner wall of the well.

As a preferred technical scheme of this embodiment, a support ring 15 is fixedly sleeved on the third pipe column 4, a plurality of rolling grooves 16 are symmetrically arranged on the circumference of the support ring 15, balls 17 are movably arranged in the rolling grooves 16, and the third pipe column 4 moves in the well and drives the balls 17 to generate rolling friction with the inner wall of the well; the setting of ball 17 rolling in slot rolling 16 for the removal of third tubular column 4 in the well is changed into the rolling friction between ball 17 and the wall of a well by sliding friction, reduces the resistance that third tubular column 4 removed in the well, simultaneously, has still reduced the area of third tubular column 4 with the wall of a well contact, further reduces the resistance that third tubular column 4 removed in the well, guarantees that third tubular column 4 removes the operating position in the well smoothly.

The working principle is as follows: when the hanging sleeve 2 needs to be fixed in a well and sealed in the well, the first pipe column 1, the hanging sleeve 2, the second pipe column 3 and the third pipe column 4 are connected into a whole, then the third pipe column 4 is put into the well in sequence, the second pipe column 3 can be bent and deformed, the curvature radius of the bending part in the well is large enough, then the third pipe column 4 can smoothly pass through the bending part of the well and enter the horizontal part of the well, meanwhile, the second pipe column 3 is bent and deformed and enters the bending part in the well, the hanging sleeve 2 and the first pipe column 1 sequentially enter the vertical part in the well, when the hanging sleeve 2 is positioned at a proper height in the well, the first pipe column 1 is driven to rotate by a torque device, at the moment, the hanging sleeve 2 is limited by the second pipe column 3 and the third pipe column 4 and cannot be driven to rotate by the first pipe column 1, the first pipe column 1 drives the outer thread body 8 to rotate in the inner thread groove 9 to generate a thread feeding effect, the first pipe column 1 moves downwards relative to the suspension sleeve 2;

on one hand, as the trapezoid body 6 is in wedge-shaped fit with the cone body 7, when the first pipe column 1 drives the cone body 7 to move downwards, the trapezoid body 6 can be pushed to move towards the outside of the suspension sleeve 2, and the trapezoid body 6 drives the support block 5 to be outwards expanded and extruded on the inner wall of the well, so that the suspension sleeve 2 is fixed in the well;

on the other hand, the first pipe column 1 drives the sealing ring 11 to move downwards in the sliding groove 12, and when the sealing ring 11 moves to press the rubber ring 13 downwards, the movable gap between the first pipe column 1 and the suspension sleeve 2 is blocked and sealed at the position where the sealing ring 11 is in close contact with the rubber ring 13, so that oil gas is prevented from leaking, and the ground surface environment is protected from being polluted.

Claims (9)

1. The utility model provides a long horizontal well completion tubular column of dense gas, includes vertical first tubular column (1) of setting in the well, its characterized in that: the lower end of the first pipe column (1) is in threaded sleeve connection with a hanging sleeve (2), a fastening assembly used for fixing the hanging sleeve in the well and a sealing assembly used for sealing the well and removing other parts outside a working channel in the first pipe column (1) are arranged on the hanging sleeve (2), the fastening assembly and the sealing assembly are driven by the thread feeding effect between the first pipe column (1) and the hanging sleeve (2), and the lower end of the hanging sleeve (2) is connected with a horizontal third pipe column (4) through a bent second pipe column (3).

2. A tight gas long horizontal well completion string according to claim 1, wherein: fastening components including hang a plurality of bracers (5) that run through the slip setting on cover (2), the tip that bracer (5) are close to in hanging cover (2) sets up into trapezoidal body (6), first tubular column (1) lower extreme sets up into and trapezoidal body (6) assorted cone (7), trapezoidal body (6) and cone (7) wedge cooperation set up.

3. A tight gas long horizontal well completion string according to claim 2, wherein: an external thread body (8) is arranged at the lower end of the cone (7), and an internal thread groove (9) matched with the external thread body (8) is arranged in the hanging sleeve (2).

4. A tight gas long horizontal well completion string according to claim 1, wherein: the sealing assembly comprises a sealing barrel (10) arranged on the suspension sleeve (2), and the sealing barrel (10) is in interference fit with the well.

5. A tight gas long horizontal well completion string according to claim 4, wherein: be provided with sealing ring (11) on first tubular column (1), be provided with in sealed section of thick bamboo (10) with sealing ring (11) assorted groove (12) that slides, the bottom surface is provided with rubber ring (13) in groove (12) that slides, sealing ring (11) keep moving in groove (12) that slides, and when removing sealing ring (11) of pushing down, can make the activity gap between first tubular column (1) and the sealed section of thick bamboo (10) sealed.

6. A tight gas long horizontal well completion string according to claim 1, wherein: the upper end of the first pipe column (1) is sleeved with a positioning sleeve (14), and the positioning sleeve (14) is fixed on the ground through a ground bolt assembly.

7. A tight gas long horizontal well completion string according to claim 1, wherein: the hanging sleeve (2) and the second pipe column (3) and the third pipe column (4) are fixedly connected through flanges and bolt assemblies.

8. A tight gas long horizontal well completion string according to claim 1, wherein: the third tubular column (4) is of a cylindrical structure with a slotted surface, and the free end far away from the second tubular column (3) is set to be conical.

9. A tight gas long horizontal well completion string according to claim 8, wherein: the fixed cover of third tubular column (4) has been connected with support ring (15), the circumference symmetry is provided with a plurality of rolling grooves (16) on support ring (15), rolling groove (16) internalization is provided with ball (17), third tubular column (4) move in the well and drive ball (17) and well inner wall production rolling friction.

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