CN214660061U - Expansion type packer with good sealing effect - Google Patents

Abstract

The utility model relates to an oil, gas field downhole tool field, the name is sealed effectual expanding packer, including center tube and packing element, the packing element cover is in the center tube outside, be equipped with the aperture on the center tube, first metal joint has around the upper portion outside of packing element, second metal joint has around the lower part outside of packing element, the shape of first metal joint with the second metal joint is a week inner ring; the upper end of the central pipe exceeds the upper end of the rubber barrel, the part of the upper end of the central pipe exceeding the rubber barrel is an upper exceeding part, external threads are arranged around the outer side of the upper exceeding part, the upper exceeding part is a first external thread section, and the periphery of the outer side of the first external thread section is in a thread structure; such expanding packer has sealed effectual, expansion packing element is not fragile, sealed validity period long, repeatedly usable's advantage.

Description

Expansion type packer with good sealing effect

Technical Field

The utility model relates to an oil gas technical field especially relates to expanding packer.

Background

At present, an expanding packer used at home and abroad is sleeved with a rubber sleeve on a central pipe, the upper end and the lower end of the rubber sleeve are respectively buckled and pressed by a pressing ring and locked by a back cap, a gap is arranged between the inner diameter of the middle part of the rubber sleeve and the outer diameter of the central pipe, the inner diameters of the two ends of the rubber sleeve are closely matched with the outer diameter of the central pipe, the expanding packer has sealing performance, a seat sealing channel is arranged at the corresponding position of the central pipe and the middle part of the rubber sleeve, a connecting female buckle is arranged in an upper joint inner hole, and a connecting male buckle is arranged on the outer diameter of a lower joint.

The working principle of the expanding packer is as follows: when the expanding packer works, the expanding packer is connected by an oil pipe and enters an oil well casing pipe and a gas well casing pipe, and in order to smoothly enter and exit, the maximum outer diameter of the expanding packer when the expanding packer is not set is smaller than the inner diameter of the casing pipe. After the packer is placed into a well to be preset, injecting liquid into an oil pipe to pressurize, enabling the liquid to enter a gap between a central pipe and a rubber cylinder through a seat sealing channel on the central pipe of the expanding packer to expand the rubber cylinder with elasticity, increasing the diameter, enabling the outer diameter of the rubber cylinder to be tightly attached to the inner wall of a sleeve, and separating the annular space between the inner diameter of the sleeve and the outer diameter of the packer by the rubber cylinder, namely achieving the purpose after the seat sealing of the expanding packer. After the expanded packer completes the intended packing cycle, the packer needs to be unset and then lifted out of the well. When the packer is unsealed, the pressure in the oil pipe is discharged, the rubber sleeve of the expandable packer rebounds under the elastic action of the rubber sleeve, liquid between the rubber sleeve and the central pipe is discharged back to the inner cavity of the central pipe, and the diameter of the rubber sleeve is restored to the state before setting, namely unsealing.

The current expanding packer has problems: common expanding packer packing element vulcanizes as an organic whole with the center tube, and packing element tip vulcanizes as an organic whole with the center tube, and is insecure like this, often can lead to leaking, needs a more ingenious firm connected mode.

Disclosure of Invention

The utility model aims at the defects and provides a packer with good sealing effect, difficult damage, long service life and more use times, namely an expansion packer with good sealing effect.

The technical scheme of the utility model be realized like this, sealed effectual expanding packer, including center tube and packing element, the packing element cover is in the center tube outside, be equipped with aperture, characterized by on the center tube: a first metal joint is arranged around the outer side of the upper part of the rubber cylinder, a second metal joint is arranged around the outer side of the lower part of the rubber cylinder, and the first metal joint and the second metal joint are in the shape of a circle of inner ring;

the upper end of the central pipe exceeds the upper end of the rubber barrel, the part of the upper end of the central pipe exceeding the rubber barrel is an upper exceeding part, external threads are arranged around the outer side of the upper exceeding part, the upper exceeding part is a first external thread section, and the periphery of the outer side of the first external thread section is in a thread structure; the upper connecting cylinder is arranged on the outer sides of the upper ends of the central tube and the rubber tube, an internal thread is arranged on the inner side of the upper connecting cylinder and is a first internal thread section, the first internal thread section is in threaded fit with the first external thread section, the part of the upper connecting cylinder below the internal thread section is a first clamping part, the first clamping part can clamp the upper end of the rubber tube to ensure that the rubber tube is coaxial with the central tube, and when the first internal thread section is in complete threaded fit with the first external thread section, the first clamping part clamps the upper end of the rubber tube to ensure that the rubber tube is coaxial with the central tube;

the lower end of the central pipe exceeds the lower end of the rubber barrel, the part of the lower end of the central pipe exceeding the rubber barrel is a lower exceeding part, a thread section is arranged around the outer side of the lower exceeding part and is a second outer thread section, and a thread structure is arranged around the outer side of the second outer thread section; the central tube with the packing element lower extreme outside is equipped with down the connecting cylinder, there is one section internal thread section lower connecting cylinder inboard, and it is second internal thread section, second internal thread section can with second external thread section screw thread fit, the part of lower connecting cylinder above the internal thread section is second chucking part, the chucking of second chucking part the lower extreme of packing element makes it guarantee coaxial with the central tube, works as when second internal thread section with the complete screw thread fit of second external thread section, the chucking of second chucking part the lower extreme of packing element makes it coaxial with the central tube.

Furthermore, an upper coupling is mounted at the upper end of the expandable packer, the lower part of the upper coupling is inserted into a groove formed by the inner side of the upper connecting cylinder and the outer side of the central pipe, the end face of the outer circular step of the upper coupling is tightly contacted with the upper end of the first internal thread section, a sealing ring groove is formed in the outer circle of the lower part of the upper coupling, and a sealing ring is arranged in the sealing ring groove; the lower part of the inner circle of the upper coupling is provided with an internal thread, the internal thread is connected with the external thread of the central tube, and the end face of the connection part is in close contact with the external thread.

Lower coupling is installed to the lower extreme of expanding packer, the upper portion of coupling injects down the connecting cylinder inboard with in the recess that the center tube outside formed, the excircle step department terminal surface of coupling with the lower extreme in the second thread section closely contacts down, the upper portion excircle department of coupling is equipped with the seal ring groove down, the seal ring inslot is equipped with the sealing washer, the interior circle upper portion of coupling is equipped with the internal thread down, the external screw thread connection of internal thread and center tube, junction terminal surface closely contact.

Further, a portion of the lower part of the upper collar contacting the inside of the upper connector cylinder is screw-engaged, and a portion of the upper part of the lower collar contacting the inside of the lower connector cylinder is screw-engaged.

The utility model has the advantages that: the expanding packer has the advantages of good sealing effect, difficulty in damage, long service life and multiple use times.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

The rubber tube sealing device comprises a central tube 1, a central tube 2, a rubber tube 3, a small hole 4, a first metal joint 5, a second metal joint 8, an upper excess part 9, a first external thread section 10, an upper connecting tube 11, a first internal thread section 12, a first clamping part 13, an upper end 14 of the rubber tube, a lower excess part 15, a lower connecting tube 16, a second clamping part 17, a lower end 18 of the rubber tube, an upper coupling 19, a sealing ring 20 and a lower coupling.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1, the expandable packer with good sealing effect comprises a central tube 1 and a rubber sleeve 2, wherein the rubber sleeve is sleeved outside the central tube, and the central tube is provided with a small hole 3, which is characterized in that: a first metal joint 4 is arranged around the outer side of the upper part of the rubber cylinder, a second metal joint 5 is arranged around the outer side of the lower part of the rubber cylinder, and the first metal joint and the second metal joint are in the shape of a circle of inner ring;

the upper end of the central tube exceeds the upper end of the rubber cylinder, the part of the upper end of the central tube exceeding the rubber cylinder is an upper exceeding part 8, the periphery of the outer side of the upper exceeding part is provided with external threads which are a first external thread section 9, and the periphery of the outer side of the first external thread section is in a thread structure; an upper connecting cylinder 10 is arranged on the outer side of the upper end of the central tube and the rubber cylinder, an internal thread is arranged on the inner side of the upper connecting cylinder and is a first internal thread section 11, the first internal thread section is in thread fit with the first external thread section, the part of the upper connecting cylinder below the internal thread section is a first clamping part 12, the upper end of the rubber cylinder is clamped by the first clamping part to ensure that the rubber cylinder is coaxial with the central tube, and when the first internal thread section is in complete thread fit with the first external thread section, the upper end of the rubber cylinder is clamped by the first clamping part to ensure that the rubber cylinder is coaxial with the central tube;

the lower end of the central pipe exceeds the lower end of the rubber barrel, the part of the lower end of the central pipe exceeding the rubber barrel is a lower exceeding part 14, a threaded section is arranged around the outer side of the lower exceeding part and is a second outer threaded section, and a threaded structure is arranged around the outer side of the second outer threaded section; the central tube with the packing element lower extreme outside is equipped with down connecting cylinder 15, there is one section internal thread section lower connecting cylinder inboard, and it is second internal thread section, second internal thread section can with second external thread section screw-thread fit, the part of lower connecting cylinder above the internal thread section is second chucking part 16, the chucking of second chucking part the lower extreme of packing element makes its assurance coaxial with the central tube, works as when second internal thread section with the complete screw-thread fit of second external thread section, the chucking of second chucking part the lower extreme of packing element makes it coaxial with the central tube.

The using method comprises the following steps: the utility model discloses an application method is comparatively simple, places this device in oil pipe, then to the intraductal input liquid of center, and liquid makes the packing element outwards expand in the cavity between aperture entering center tube and the packing element, and the whole oil pipe has been stopped up outward to the expanding packing element, has reached the function purpose.

The utility model discloses a structure, because above-mentioned design, the packing element just blocks in the center tube outside like this, is difficult for droing, goes up the connecting cylinder and can screw up in the center tube outside, and the chucking can the chucking packing element when screwing up, and lower connecting cylinder is with reason, more enables the packing element cover like this and establishes more firmly in the center tube outside, is difficult for droing more and opens the glue.

Furthermore, an upper coupling 18 is installed at the upper end of the expandable packer, the lower part of the upper coupling is inserted into a groove formed on the inner side of the upper connecting cylinder and the outer side of the central pipe, the end face of the outer circular step of the upper coupling is tightly contacted with the upper end of the first internal thread section, a sealing ring groove is formed in the outer circle of the lower part of the upper coupling, and a sealing ring 19 is arranged in the sealing ring groove; the lower part of the inner circle of the upper coupling is provided with an internal thread, the internal thread is connected with the external thread of the central tube, and the end face of the connection part is in close contact with the external thread.

Coupling 20 down is installed to the lower extreme of expanding packer, the upper portion of coupling injects down the connecting cylinder inboard with in the recess that the center tube outside formed, the excircle step department terminal surface of coupling down with the lower extreme in the second screw thread section in close contact with, the upper portion excircle department of coupling is equipped with the seal ring groove down, the seal ring inslot is equipped with sealing washer 19, the interior circle upper portion of coupling is equipped with the internal thread down, the external thread connection of internal thread and center tube, junction terminal surface in close contact with.

Set up like this, go up the collar and owing to set up the sealing washer with lower collar, can play sealed effect, prevent that external grit from getting into.

Further, the portion of the lower portion of the upper collar that contacts the inside of the upper connector barrel is a threaded fit, and the portion of the upper portion of the lower collar that contacts the inside of the lower connector barrel is a threaded fit.

Set up like this, owing to the inboard screw-thread fit of lower part and the last connecting cylinder at last collar is connected, the upper portion of lower collar is screw-thread fit with the inboard part of contacting of lower connecting cylinder, is difficult for droing like this more, and life is longer.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention, and the technical solutions are all covered in the scope of the description of the present invention.

Claims (3)

1. Sealed effectual expanding packer, including center tube and packing element, the packing element cover is in the center tube outside, be equipped with aperture, characterized by on the center tube: a first metal joint is arranged around the outer side of the upper part of the rubber cylinder, a second metal joint is arranged around the outer side of the lower part of the rubber cylinder, and the first metal joint and the second metal joint are in the shape of a circle of inner ring;

the upper end of the central pipe exceeds the upper end of the rubber barrel, the part of the upper end of the central pipe exceeding the rubber barrel is an upper exceeding part, external threads are arranged around the outer side of the upper exceeding part, the upper exceeding part is a first external thread section, and the periphery of the outer side of the first external thread section is in a thread structure; the upper connecting cylinder is arranged on the outer sides of the upper ends of the central tube and the rubber tube, an internal thread is arranged on the inner side of the upper connecting cylinder and is a first internal thread section, the first internal thread section is in threaded fit with the first external thread section, the part of the upper connecting cylinder below the internal thread section is a first clamping part, the first clamping part can clamp the upper end of the rubber tube to ensure that the rubber tube is coaxial with the central tube, and when the first internal thread section is in complete threaded fit with the first external thread section, the first clamping part clamps the upper end of the rubber tube to ensure that the rubber tube is coaxial with the central tube;

the lower end of the central pipe exceeds the lower end of the rubber barrel, the part of the lower end of the central pipe exceeding the rubber barrel is a lower exceeding part, a thread section is arranged around the outer side of the lower exceeding part and is a second outer thread section, and a thread structure is arranged around the outer side of the second outer thread section; the central tube with the packing element lower extreme outside is equipped with down the connecting cylinder, there is one section internal thread section lower connecting cylinder inboard, and it is second internal thread section, second internal thread section can with second external thread section screw thread fit, the part of lower connecting cylinder above the internal thread section is second chucking part, the chucking of second chucking part the lower extreme of packing element makes it guarantee coaxial with the central tube, works as when second internal thread section with the complete screw thread fit of second external thread section, the chucking of second chucking part the lower extreme of packing element makes it coaxial with the central tube.

2. The expandable packer of claim 1, further comprising: an upper coupling is mounted at the upper end of the expandable packer, the lower part of the upper coupling is inserted into a groove formed by the inner side of the upper connecting cylinder and the outer side of the central pipe, the end face of the outer circle step of the upper coupling is tightly contacted with the upper end of the first internal thread section, a sealing ring groove is formed in the outer circle of the lower part of the upper coupling, and a sealing ring is arranged in the sealing ring groove; the lower part of the inner circle of the upper coupling is provided with an internal thread, the internal thread is connected with the external thread of the central tube, and the end surface of the connection part is in close contact with the external thread;

lower coupling is installed to the lower extreme of expanding packer, the upper portion of coupling injects down the connecting cylinder inboard with in the recess that the center tube outside formed, the excircle step department terminal surface of coupling with the lower extreme in the second thread section closely contacts down, the upper portion excircle department of coupling is equipped with the seal ring groove down, the seal ring inslot is equipped with the sealing washer, the interior circle upper portion of coupling is equipped with the internal thread down, the external screw thread connection of internal thread and center tube, junction terminal surface closely contact.

3. The expandable packer of claim 2, further comprising: the lower part of the upper coupling and the inner side of the upper connecting cylinder are in threaded fit, and the upper part of the lower coupling and the inner side of the lower connecting cylinder are in threaded fit.

Images