CN212508202U

CN212508202U - Step-by-step expansion type packer

Info

Publication number: CN212508202U
Application number: CN202020922116.1U
Authority: CN
Inventors: 张毅; 高涛; 赵三省; 梁华歆; 梁栩; 吴占关; 刘兵; 姚明伟; 吕祥斌; 姚晓峰; 乔伟
Original assignee: China National Petroleum Corp; CNPC Xibu Drilling Engineering Co Ltd
Current assignee: China National Petroleum Corp; CNPC Xibu Drilling Engineering Co Ltd
Priority date: 2020-05-27
Filing date: 2020-05-27
Publication date: 2021-02-09
Anticipated expiration: 2030-05-27

Abstract

The utility model relates to the technical field of oilfield fracturing operation, in particular to a step-by-step expanding packer, which comprises an upper joint, a central pipe, a lower joint, a rubber sleeve device and a sliding sleeve, wherein the upper joint is fixedly arranged on the outer side of the upper part of the central pipe, and the lower joint is fixedly arranged on the outer side of the lower part of the central pipe; a rubber cylinder assembly with expandable liquid inlet is arranged on the outer side of the middle part of the central tube, and an expansion gap is arranged between the rubber cylinder assembly and the central tube; the outer side of the upper part of the lower joint is provided with a liquid inlet hole communicated with an inner pipe and an outer pipe, and the inner side of the lower joint corresponding to the position of the liquid inlet hole is fixedly provided with a sliding sleeve with the lower part radially shrinking inwards through a shear pin. The utility model has reasonable and compact structure and convenient use, and is convenient for ball shooting to realize the step-by-step starting of seat sealing by arranging the sliding sleeve and the shear pin; through setting up the hole enlargement annular, make descending sliding sleeve lower part radial outside expansion, realize suppressing and press the ball and continue to fall, have stable, high-efficient and the characteristics of being convenient for control.

Description

Step-by-step expansion type packer

Technical Field

The utility model relates to an oil field fracturing operation technical field is an expanding packer step by step.

Background

Hydraulic jet fracturing is an important oil and gas well development mode at present, integrates sand-collecting and jetting perforation, fracturing and isolation, and is suitable for oil and gas wells of various well types. In the perforation fracturing process, a packer is needed to be used for packing a plurality of oil-gas layers, mutual interference and influence between construction layers are eliminated, the trend of fracturing sand fluid is ensured to enter a construction target layer, and the fracturing construction effect is improved. At present, when separate-layer fracturing operation is carried out, different oil and gas layers need to be set in the fracturing process from bottom to top step by step, and step-by-step setting can not be realized through the existing packer.

Disclosure of Invention

The utility model provides an expanding packer step by step has overcome above-mentioned prior art not enough, and it can effectively solve the problem that current packer can't realize the setting step by step.

The technical scheme of the utility model is realized through following measure: a step-by-step expansion type packer comprises an upper joint, a central pipe, a lower joint, a rubber sleeve device and a sliding sleeve, wherein the upper joint is fixedly arranged on the outer side of the upper part of the central pipe, and the lower joint is fixedly arranged on the outer side of the lower part of the central pipe; a rubber cylinder assembly with expandable liquid inlet is arranged on the outer side of the middle part of the central tube, and an expansion gap is arranged between the rubber cylinder assembly and the central tube; the outer side of the upper part of the lower joint is provided with a liquid inlet hole communicated with an inner pipe and an outer pipe, the inner side of the lower joint corresponding to the position of the liquid inlet hole is fixedly provided with a sliding sleeve with the lower part radially and inwardly contracted through a shear pin, the upper end of the sliding sleeve is positioned above the liquid inlet hole, the lower end of the sliding sleeve is positioned below the liquid inlet hole, and the inner side of the middle part of the lower joint corresponding to the position below the sliding sleeve is provided; the distance between the lower end of the sliding sleeve and the upper end of the diameter expansion ring groove is a first distance, the distance between the upper end of the sliding sleeve and the liquid inlet hole is a second distance, and the first distance is larger than the second distance.

The following are further optimization or/and improvement of the technical scheme of the utility model:

the sliding sleeve can comprise a plugging sleeve and elastic claws, the upper end of the plugging sleeve is positioned above the liquid inlet hole, the lower end of the plugging sleeve is positioned below the liquid inlet hole, the elastic claws are fixedly arranged at intervals along the circumferential direction at the lower end of the plugging sleeve, and a limiting boss is arranged on the outer side of the lower end of each elastic claw.

The above-mentioned still can include O shape sealing washer, is equipped with O shape sealing washer between the sliding sleeve that corresponds the feed liquor hole top position and the lower clutch, is equipped with O shape sealing washer between the sliding sleeve that corresponds the feed liquor hole below position and the lower clutch.

The rubber sleeve assembly comprises an outer rubber sleeve, an inner rubber sleeve and support bars, the outer side of the middle part of the central tube is sleeved with the inner rubber sleeve, the outer side of the inner rubber sleeve is uniformly provided with at least two support bars along the circumference, the upper ends of the support bars are fixedly arranged with the corresponding positions of the outer side of the upper end of the inner rubber sleeve, the lower ends of the support bars are fixedly arranged with the corresponding positions of the outer side of the lower end of the inner rubber sleeve, the outer rubber sleeve is sleeved on the outer side of the middle part of the inner rubber sleeve, and the inner side of the middle part of the outer rubber sleeve is fixedly arranged with the outer side of the middle part of; the upper end of the inner rubber cylinder is fixedly arranged together with the upper joint through an upper fixing assembly, the lower end of the inner rubber cylinder is fixedly provided with a lower floating assembly capable of axially moving along the outer side of the upper part of the lower joint, and the outer side of the middle part of the lower joint corresponding to the lower position of the lower floating assembly is fixedly provided with a limiting assembly.

The lower floating assembly can comprise a lower rubber cylinder seat and a floating sleeve, the outer side of the middle part of the lower joint is provided with the floating sleeve, the upper part of the floating sleeve is positioned above the lower rubber cylinder seat, the floating sleeve comprises a connecting part and a floating part, and the outer side of the upper end of the connecting part and the inner side of the upper end of the floating part are fixedly arranged together; the lower end of the inner rubber cylinder is fixedly provided with a lower rubber cylinder seat sleeved on the outer side of the lower part of the central tube, and the inner side of the lower end of the lower rubber cylinder seat is fixedly arranged with the outer side of the connecting part; the outer side of the upper part of the lower joint corresponding to the position below the liquid inlet hole is provided with a sealing ring table, the inner side of the upper end of the floating part corresponding to the position above the sealing ring table is provided with a sliding vertical groove, the outer side of the upper end of the lower joint is fixedly provided with a sliding block, and the outer end of the sliding block is positioned in the sliding vertical groove.

The lower floating assembly can also comprise a sealing ring, and at least one sealing ring is arranged between the lower rubber cylinder seat and the connecting part at intervals up and down; at least one sealing ring is arranged between the lower joint and the central pipe at intervals up and down; at least one sealing ring is arranged between the sealing ring platform and the floating sleeve at intervals up and down.

The upper fixing device can comprise an upper rubber cylinder seat, the outer side of the lower end of the upper joint is fixedly provided with the upper rubber cylinder seat, and the inner side of the lower end of the upper rubber cylinder seat is fixedly arranged with the inner rubber cylinder.

The limiting assembly can comprise a limiting blocking ring and a limiting screw, the limiting blocking ring is arranged on the outer side of the middle part of the lower connector corresponding to the lower floating assembly below, and the limiting blocking ring is fixedly installed together with the lower connector through the limiting screw.

The utility model has reasonable and compact structure and convenient use, and is convenient for ball shooting to realize the step-by-step starting of seat sealing by arranging the sliding sleeve and the shear pin; through setting up the hole enlargement annular, make descending sliding sleeve lower part radial outside expansion, realize suppressing and press the ball and continue to fall, have stable, high-efficient and the characteristics of being convenient for control.

Drawings

Fig. 1 is a schematic front view of a half-sectional structure of a preferred embodiment of the present invention.

The codes in the figures are respectively: the sealing device comprises an upper joint 1, a central pipe 2, a lower joint 3, a liquid inlet hole 4, an expanding ring groove 5, a plugging sleeve 6, an elastic claw 7, an outer rubber cylinder 8, an inner rubber cylinder 9, a supporting bar 10, an upper rubber cylinder seat 11, a lower rubber cylinder seat 12, a connecting part 13, a floating part 14, a sliding block 15, a limiting baffle ring 16, a limiting screw 17, a shear pin 18, a sealing ring platform 19, an O-shaped sealing ring 20 and a sealing ring 21.

Detailed Description

The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.

In the present invention, for convenience of description, the description of the relative position relationship of the components is described according to the layout mode of the attached drawing 1 in the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of the drawings of the specification.

The invention will be further described with reference to the following examples and drawings:

as shown in the attached figure 1, the step-by-step expandable packer comprises an upper joint 1, a central pipe 2, a lower joint 3, a rubber sleeve device and a sliding sleeve, wherein the upper joint 1 is fixedly arranged on the outer side of the upper part of the central pipe 2, and the lower joint 3 is fixedly arranged on the outer side of the lower part of the central pipe 2; a rubber cylinder assembly with expandable liquid inlet is arranged on the outer side of the middle part of the central tube 2, and an expansion gap is arranged between the rubber cylinder assembly and the central tube 2; the outer side of the upper part of the lower joint 3 is provided with a liquid inlet hole 4 communicated with an inner pipe and an outer pipe, the inner side of the lower joint 3 corresponding to the position of the liquid inlet hole 4 is fixedly provided with a sliding sleeve with the lower part radially and inwardly contracted through a shear pin 18, the upper end of the sliding sleeve is positioned above the liquid inlet hole 4, the lower end of the sliding sleeve is positioned below the liquid inlet hole 4, and the inner side of the middle part of the lower joint 3 corresponding to the position below the sliding sleeve is; the distance between the lower end of the sliding sleeve and the upper end of the diameter expansion ring groove 5 is a first distance, the distance between the upper end of the sliding sleeve and the liquid inlet hole 4 is a second distance, and the first distance is larger than the second distance. According to requirements, a plurality of the embodiments are installed in the fracturing string at intervals up and down, the inner diameters of the sliding sleeves located at the lower position are smaller than those of the adjacent sliding sleeves located above the sliding sleeves, and the sliding sleeve located at the lowest position in the embodiment can be omitted; in addition, the rubber sleeve setting principle of the utility model is the prior known technology, and can be the same as the rubber sleeve setting of the K344 type expanding packer. In the using process, the sliding sleeve blocks the liquid inlet hole 4, after the shear pin 18 is cut off by throwing a ball, the sliding sleeve moves downwards to open the liquid inlet hole 4, and the liquid in the rubber cylinder assembly can be sealed after flowing out of the liquid inlet hole 4; through multiple ball throwing, the ball diameter of the successively thrown pressure-holding ball is matched with the inner diameter of the sliding sleeve from bottom to top, the thrown pressure-holding ball cuts off the shear pin 18 on the sliding sleeve at the corresponding position and then opens the liquid inlet hole 4, so that the embodiment at the position completes seat sealing on the production layer where the pressure-holding ball is positioned, and therefore through multiple ball throwing, the step-by-step perforation fracturing of the production layer is controlled; through the arrangement that the first distance is larger than the second distance, the lower end of the sliding sleeve is prevented from contacting with the lower end surface of the diameter-expanding ring groove 5 when the sliding sleeve moves downwards, and the liquid inlet hole 4 is still plugged by the sliding sleeve; in addition, drop into at first the utility model provides a suppress pressure ball because the ball footpath is little, can directly set up from the top the utility model discloses in the sliding sleeve pass through, can not cut the shear pin 18 of this position to only can cut the shear pin 18 of tubular column lower part rather than assorted sliding sleeve, realize the seat seal step by step promptly.

The progressive expansion packer can be further optimized or/and improved according to actual needs:

as shown in the attached figure 1, the sliding sleeve comprises a plugging sleeve 6 and elastic claws 7, the upper end of the plugging sleeve 6 is positioned above the liquid inlet hole 4, the lower end of the plugging sleeve 6 is positioned below the liquid inlet hole 4, the elastic claws 7 are fixedly arranged at the lower end of the plugging sleeve 6 along the circumferential direction at intervals, and a limiting boss is arranged on the outer side of the lower end of each elastic claw 7. In the using process, before the shear pin 18 is cut off, the outer side of the limiting boss is in contact with the inner side of the lower connector 3, so that the elastic claw 7 cannot expand radially outwards, namely the lower part of the sliding sleeve is in a circular truncated cone shape with a large upper part and a small lower part, after the shear pin 18 is cut off, the sliding sleeve descends along with the pressure-building ball, when the limiting boss enters the diameter-expanding ring groove 5, the elastic claw 7 expands radially outwards, the pressure-building ball slips from the lower end of the elastic claw 7 and enters the lower pipe string, and under the action of the diameter-expanding ring groove 5, the lower side of the diameter-expanding ring groove 5 is in contact with the lower end of the limiting boss, so that the sliding sleeve is prevented from entering the lower.

As shown in the attached figure 1, the liquid inlet device further comprises an O-shaped sealing ring 20, the O-shaped sealing ring 20 is arranged between the sliding sleeve corresponding to the position above the liquid inlet hole 4 and the lower connector 3, and the O-shaped sealing ring 20 is arranged between the sliding sleeve corresponding to the position below the liquid inlet hole 4 and the lower connector 3. In the use, through setting up O shape sealing washer 20, liquid outflow when preventing to throw ball seat seal the utility model discloses, cause shear pin 18 can't cut.

As shown in the attached drawing 1, the rubber sleeve assembly comprises an outer rubber sleeve 8, an inner rubber sleeve 9 and support bars 10, the outer side of the middle part of the central tube 2 is sleeved with the inner rubber sleeve 9, at least two support bars 10 are uniformly distributed on the outer side of the inner rubber sleeve 9 along the circumference, the upper ends of the support bars 10 are fixedly installed together with the outer side of the upper end of the inner rubber sleeve 9 at corresponding positions, the lower ends of the support bars 10 are fixedly installed together with the outer side of the lower end of the inner rubber sleeve 9 at corresponding positions, the outer side of the middle part of the inner rubber sleeve 9 is sleeved with the outer rubber sleeve 8, and the inner side of the middle part of the outer rubber sleeve 8 is fixedly installed together with the outer; the upper end of the inner rubber cylinder 9 is fixedly installed together with the upper joint 1 through an upper fixing assembly, the lower end of the inner rubber cylinder 9 is fixedly installed with a lower floating assembly capable of axially moving along the outer side of the upper part of the lower joint 3, and a limiting component is fixedly installed on the outer side of the middle part of the lower joint 3 corresponding to the lower position of the lower floating assembly. In the use, enable lower floating assembly through such setting and reciprocate for 3 axial of lower clutch to floating assembly goes upward under the effect of liquid, under the fixed circumstances in packing element assembly upper end, lower floating assembly goes upward and the liquid that flows in the expansion gap can make the outside arch in support bar 10 middle part, thereby realizes making the utility model discloses a seat seals.

As shown in fig. 1, the lower floating assembly comprises a lower rubber cylinder base 12 and a floating sleeve, the floating sleeve is arranged on the outer side of the middle part of the lower joint 3, the upper part of the floating sleeve is positioned above the lower rubber cylinder base, the floating sleeve comprises a connecting part 13 and a floating part 14, and the outer side of the upper end of the connecting part 13 is fixedly installed with the inner side of the upper end of the floating part 14; the lower end of the inner rubber cylinder 9 is fixedly provided with a lower rubber cylinder seat 12 which is sleeved on the outer side of the lower part of the central tube 2, and the inner side of the lower end of the lower rubber cylinder seat 12 is fixedly arranged with the outer side of the connecting part 13; the outer side of the upper part of the lower joint 3 corresponding to the lower part of the liquid inlet hole 4 is provided with a sealing ring platform 19, the inner side of the upper end of the floating part 14 corresponding to the upper part of the sealing ring platform 19 is provided with a sliding vertical groove, the outer side of the upper end of the lower joint 3 is fixedly provided with a sliding block 15, and the outer end of the sliding block 15 is positioned in the sliding vertical groove. In the use process, the floating sleeve can axially move up and down relative to the lower joint 3 through the arrangement, so that the floating sleeve is pushed to move upwards under the action of liquid, and the middle part of the support bar 10 can be protruded outwards by the liquid flowing into the floating sleeve ascending and expansion gap under the condition that the upper end of the rubber cylinder assembly is fixed, thereby realizing the seat seal of the utility model; in addition, because the sealing ring platform 19 is arranged, the liquid flowing into the space between the floating sleeve and the lower joint 3 from the liquid inlet hole 4 cannot flow downwards but only flows upwards, so that the liquid pressure acts on the lower end surface of the connecting part 13 to realize the upward movement of the floating sleeve.

As shown in fig. 1, the lower floating assembly further includes a sealing ring 21, and at least one sealing ring 21 is arranged between the lower rubber cylinder base 12 and the connecting portion 13 at an interval from top to bottom; at least one sealing ring 21 is arranged between the lower joint 3 and the central pipe 2 at intervals up and down; at least one sealing ring 21 is arranged between the sealing ring platform 19 and the floating sleeve at intervals up and down. In the use, through such setting, be convenient for guarantee the leakproofness, the promotion that the liquid that flows out in making feed liquor hole 4 can be better floats the cover and goes upward and flow into the inflation clearance and make interior packing element 9 inflation, accomplish the utility model discloses a seat seals.

As shown in the attached figure 1, the upper fixing device comprises an upper rubber cylinder seat 11, the outer side of the lower end of the upper joint 1 is fixedly provided with the upper rubber cylinder seat 11, and the inner side of the lower end of the upper rubber cylinder seat 11 is fixedly arranged with the inner rubber cylinder 9. In the use process, the rubber cylinder assembly is convenient to fix at the upper end through the arrangement.

As shown in fig. 1, the limiting component comprises a limiting stop ring 16 and a limiting screw 17, the limiting stop ring 16 is arranged on the outer side of the middle part of the lower joint 3 corresponding to the lower position of the lower floating assembly, and the limiting stop ring 16 is fixedly installed with the lower joint 3 through the limiting screw 17. This arrangement prevents the floating sleeve from slipping off the lower end of the lower coupling 3 during use.

Above technical feature constitutes the utility model discloses a best embodiment, it has stronger adaptability and best implementation effect, can increase and decrease unnecessary technical feature according to actual need, satisfies the demand of different situation.

Claims

1. A step-by-step expansion type packer is characterized by comprising an upper joint, a central pipe, a lower joint, a rubber sleeve device and a sliding sleeve, wherein the upper joint is fixedly installed on the outer side of the upper part of the central pipe, and the lower joint is fixedly installed on the outer side of the lower part of the central pipe; a rubber cylinder assembly with expandable liquid inlet is arranged on the outer side of the middle part of the central tube, and an expansion gap is arranged between the rubber cylinder assembly and the central tube; the outer side of the upper part of the lower joint is provided with a liquid inlet hole communicated with an inner pipe and an outer pipe, the inner side of the lower joint corresponding to the position of the liquid inlet hole is fixedly provided with a sliding sleeve with the lower part radially and inwardly contracted through a shear pin, the upper end of the sliding sleeve is positioned above the liquid inlet hole, the lower end of the sliding sleeve is positioned below the liquid inlet hole, and the inner side of the middle part of the lower joint corresponding to the position below the sliding sleeve is provided; the distance between the lower end of the sliding sleeve and the upper end of the diameter expansion ring groove is a first distance, the distance between the upper end of the sliding sleeve and the liquid inlet hole is a second distance, and the first distance is larger than the second distance.

2. A stepwise expansion packer as claimed in claim 1, wherein the sliding sleeve comprises a plugging sleeve and elastic claws, the upper end of the plugging sleeve is located above the liquid inlet hole, the lower end of the plugging sleeve is located below the liquid inlet hole, the elastic claws are fixedly arranged at intervals along the circumferential direction at the lower end of the plugging sleeve, and a limit boss is arranged on the outer side of the lower end of each elastic claw.

3. A stage-by-stage expandable packer as recited in claim 2, further comprising an O-ring seal disposed between the sliding sleeve and the lower joint at a position corresponding to above the fluid inlet port, and an O-ring seal disposed between the sliding sleeve and the lower joint at a position corresponding to below the fluid inlet port.

4. The step-by-step expandable packer as claimed in claim 1, 2 or 3, further comprising an upper fixing assembly, a lower floating assembly and a limiting assembly, wherein the rubber sleeve assembly comprises an outer rubber sleeve, an inner rubber sleeve and supporting bars, the outer side of the middle part of the central tube is sleeved with the inner rubber sleeve, at least two supporting bars are uniformly distributed on the outer side of the inner rubber sleeve along the circumference, the upper ends of the supporting bars are fixedly installed together with the outer side of the upper end of the inner rubber sleeve at corresponding positions, the lower ends of the supporting bars are fixedly installed together with the outer side of the lower end of the inner rubber sleeve at corresponding positions, the outer rubber sleeve is sleeved on the outer side of the middle part of the inner rubber sleeve, and the inner side of the middle; the upper end of the inner rubber cylinder is fixedly arranged together with the upper joint through an upper fixing assembly, the lower end of the inner rubber cylinder is fixedly provided with a lower floating assembly capable of axially moving along the outer side of the upper part of the lower joint, and the outer side of the middle part of the lower joint corresponding to the lower position of the lower floating assembly is fixedly provided with a limiting assembly.

5. The stepwise expandable packer according to claim 4, wherein the lower floating assembly comprises a lower rubber cylinder seat and a floating sleeve, the floating sleeve is arranged on the outer side of the middle part of the lower joint, the upper part of the floating sleeve is positioned above the lower rubber cylinder seat, the floating sleeve comprises a connecting part and a floating part, and the outer side of the upper end of the connecting part and the inner side of the upper end of the floating part are fixedly arranged together; the lower end of the inner rubber cylinder is fixedly provided with a lower rubber cylinder seat sleeved on the outer side of the lower part of the central tube, and the inner side of the lower end of the lower rubber cylinder seat is fixedly arranged with the outer side of the connecting part; the outer side of the upper part of the lower joint corresponding to the position below the liquid inlet hole is provided with a sealing ring table, the inner side of the upper end of the floating part corresponding to the position above the sealing ring table is provided with a sliding vertical groove, the outer side of the upper end of the lower joint is fixedly provided with a sliding block, and the outer end of the sliding block is positioned in the sliding vertical groove.

6. A progressive expansion packer as recited in claim 5, wherein the lower float assembly further comprises a sealing ring, at least one sealing ring is provided between the lower rubber cylinder base and the connecting portion at intervals up and down; at least one sealing ring is arranged between the lower joint and the central pipe at intervals up and down; at least one sealing ring is arranged between the sealing ring platform and the floating sleeve at intervals up and down.

7. A progressive expansion packer as claimed in claim 4, wherein the upper fixing means comprises an upper rubber cylinder base, the outer side of the lower end of the upper joint is fixedly provided with the upper rubber cylinder base, and the inner side of the lower end of the upper rubber cylinder base is fixedly provided with the inner rubber cylinder.

8. A progressive expansion packer as claimed in claim 5 or 6, wherein the upper fixing means comprises an upper rubber cylinder base, the outer side of the lower end of the upper joint is fixedly provided with the upper rubber cylinder base, and the inner side of the lower end of the upper rubber cylinder base is fixedly provided with the inner rubber cylinder.

9. A step-by-step expandable packer as claimed in claim 5, 6 or 7, wherein the limiting component comprises a limiting stop ring and a limiting screw, the limiting stop ring is arranged on the outer side of the middle part of the lower joint corresponding to the lower position of the lower floating assembly, and the limiting stop ring is fixedly installed with the lower joint through the limiting screw.

10. A step-by-step expandable packer as claimed in claim 8, wherein the limiting component comprises a limiting stop ring and a limiting screw, the limiting stop ring is arranged on the outer side of the middle part of the lower joint corresponding to the lower position of the lower floating assembly, and the limiting stop ring is fixedly installed with the lower joint through the limiting screw.