CN213953532U

CN213953532U - Inner rotation backwashing oil pipe nipple device

Info

Publication number: CN213953532U
Application number: CN202022980018.6U
Authority: CN
Inventors: 赵自强; 王立新; 曾倩宜; 葛嵩; 袁辉; 周振宇
Original assignee: China National Offshore Oil Corp CNOOC; CNOOC China Ltd Zhanjiang Branch; CNOOC China Ltd Hainan Branch
Current assignee: China National Offshore Oil Corp CNOOC; CNOOC China Ltd Zhanjiang Branch; CNOOC China Ltd Hainan Branch
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-08-13
Anticipated expiration: 2030-12-10

Abstract

The utility model discloses an internal rotation backwash oil pipe nipple joint device, including the inlayer tubular column, outer sleeve pipe has been cup jointed in the inlayer tubular column outside, stretch out respectively at the both ends of inlayer tubular column outer sheathed tube both ends, outer sheathed tube both ends inboard all cup joints through the bearing the outside of inlayer tubular column, be equipped with annular visor in the outside of bearing, the inner ring of annular visor with the surface butt of inlayer tubular column, the outer loop of annular visor with outer sheathed tube inboard fixed connection. The utility model discloses a short circuit device can realize pit shaft reverse circulation, the positive rotatory effect of downhole tool, makes the tubular column have the rotatory limit reverse circulation in limit and washes the function, has solved the on-the-spot construction process difficult problem that has the rotatory limit reverse circulation in limit.

Description

Inner rotation backwashing oil pipe nipple device

Technical Field

The utility model relates to a workover tool, especially relate to an internal rotation backwash oil pipe nipple joint device.

Background

In the process of well workover of an offshore platform, a large amount of sand is produced in a shaft, a circulation pipeline is required to be connected, a universal blowout preventer is required to be closed, then reverse circulation well flushing is carried out, and a pipe column is required to additionally have a rotation function in order to achieve a better sand flushing effect at the bottom of a well; in the process of grinding, sleeving and milling in overhaul operation, in order to enable the workover fluid to better carry chips to a wellhead, the tubular column is also required to have the function of reverse circulation flushing while the tubular column is rotatably ground and milled. Because the annular space sectional area of present tubular column is far more than the tubular column sectional area, it is effectual that just circulate to wash the effect under the same discharge capacity does not have the reverse circulation, but the present equipment in market can only satisfy the tubular column and rotate the positive circulation well-flushing simultaneously. For example, chinese patent No. CN106368630B, publication No. 2019.3.22: a sand washing method and a special tool can only meet the requirement that a pipe column rotates and a well is washed in a positive circulation mode, so that the pipe column with the functions of rotating and washing in a reverse circulation mode is needed in order to better carry dust sand or debris to a well mouth in the process of large-amount sand production, overhaul operation grinding, sleeving and milling of a shaft, and the construction process problem that the rotation and the reverse circulation are carried out on the site is solved.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an interior rotation backwash oil pipe nipple joint device has been designed for this reason, and this short circuit device can realize pit shaft reverse circulation, the positive rotatory effect of instrument in the pit, makes the tubular column have the rotatory limit reverse circulation in limit and washes the function, has solved the on-the-spot construction process difficult problem that has the rotatory limit reverse circulation in limit.

The technical scheme of the utility model is that:

the inner rotation backwashing oil pipe nipple device comprises an inner pipe column, wherein an outer sleeve is sleeved on the outer side of the inner pipe column, two ends of the inner pipe column extend out of two ends of the outer sleeve respectively, the inner sides of two ends of the outer sleeve are sleeved on the outer side of the inner pipe column through bearings, an annular protective cover is arranged on the outer side of each bearing, an inner ring of the annular protective cover is abutted to the outer surface of the inner pipe column, and an outer ring of the annular protective cover is fixedly connected with the inner side of the outer sleeve.

The both ends of inlayer tubular column all external other tubular columns, and outer pipe box is locked by universal preventer, and outer sleeve pipe can rotate inlayer tubular column relatively through the bearing, and at this moment, can make the relative outer pipe box rotary motion of inlayer tubular column under the effect of the top drive of rig floor or carousel, realize pit shaft reverse circulation, downhole tool is just rotatory, makes the tubular column have the limit rotation limit reverse circulation and washes the function. The annular protective covers on the two end faces of the inner-layer pipe column limit the axial movement direction of the inner-layer pipe column, and the situation that debris falls into the bearing to influence relative rotation can be avoided.

Furthermore, both ends of the inner-layer pipe column are provided with female couplings. The two ends of the inner-layer pipe column are connected with other external pipe columns through a female coupling.

Furthermore, the button type of the female coupling comprises common button types such as EU, NU or BGT2 and the like, and is consistent with the button type of the external pipe column.

Furthermore, a sealing rubber ring is arranged between the annular protective cover and the bearing, so that the sealing property between the inner-layer pipe column and the outer-layer sleeve is enhanced, and the bearing is prevented from being influenced by external debris.

Furthermore, the annular protective cover and the inner side of the outer sleeve are welded into a whole, so that the overall structural strength of the outer sleeve is enhanced, and the operation requirement is met.

Further, the thickness of the inner-layer pipe column is 5mm-10 mm.

Further, the thickness of the outer sleeve is 5mm-10 mm.

Further, the inner-layer pipe column and the outer-layer casing are both made of stainless steel.

Adopt the stainless steel of suitable thickness to make inlayer tubular column and outer sleeve pipe, reinforcing structural strength satisfies the extrusion strength when the operation, and the material of selecting is wear-resistant.

Further, the surfaces of the inner layer pipe column and the outer layer pipe column are both electroplated with metal anti-corrosion coatings.

Further, the metal anti-corrosion coating comprises a zinc-plated coating, a tin-plated coating or a nickel-plated coating.

The surfaces of the inner layer pipe column and the outer layer pipe column are coated with metal anti-corrosion coatings, so that the anti-corrosion performance is enhanced, and the service life is prolonged.

The utility model has the advantages that:

according to the utility model discloses a structure of internal rotation backwash oil pipe nipple joint device, the outer sleeve pipe of the device can be locked to universal preventer, because the bearing that the inlayer tubular column passes through both ends can outer sleeve pipe rotary motion relatively, consequently can make inlayer tubular column rotary motion under the effect of top drive or carousel of rig floor to can realize that pit shaft reverse circulation, downhole tool are just rotatory. The utility model solves the problem that dust sand and crumbs are returned to the well mouth in the process of large amount of sand production of the shaft or overhaul operation grinding, sleeving and milling; the problem of the on-site construction process that the rotation and the reverse circulation are carried out simultaneously is solved, accidents such as pipe column blockage and drill clamping are avoided, the operation timeliness is improved, and the purposes of cost reduction and efficiency improvement are achieved.

Drawings

Fig. 1 is a schematic structural view of a pipe nipple device of the present invention;

FIG. 2 is a schematic cross-sectional view of FIG. 1;

FIG. 3 is a schematic top view of FIG. 1;

in the figure: the pipe comprises an inner layer pipe column 1, a female coupling 101, an outer layer sleeve 2, a bearing 3, an annular protective cover 4 and a sealing rubber ring 5.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

Example 1:

as shown in fig. 1-3, an inner rotation backwashing oil pipe nipple device comprises an inner pipe column 1, an outer casing pipe 2 is sleeved outside the inner pipe column 1, two ends of the inner pipe column 1 respectively extend out of two ends of the outer casing pipe 2, two ends of the inner pipe column 1 are both female couplings 101, two ends of the outer casing pipe 2 are both sleeved outside the inner pipe column 1 through bearings 3, an annular protective cover 4 is arranged on the outer side of each bearing 3, an inner ring of the annular protective cover 4 is abutted to the outer surface of the inner pipe column 1, and an outer ring of the annular protective cover 4 is fixedly connected with the inner side of the outer casing pipe 2.

In the present embodiment, the profile of the box 101 includes EU, NU or BGT2, which are common profiles, and is consistent with the profile of the external pipe string.

In this embodiment, a sealing rubber ring 5 is further disposed between the annular protective cover 4 and the bearing 3, so as to enhance the sealing property between the inner-layer tubular column 1 and the outer-layer casing 2, and prevent the bearing from being affected by external debris.

In this embodiment, the annular protection cover 4 is welded with the inner side of the outer casing 2 into a whole, so that the overall structural strength of the outer casing 2 is enhanced, and the operation requirement is met.

In the embodiment, the annular protective covers 4 and the sealing rubber rings 5 at the two ends limit the movement direction of the inner-layer tubular column 1, and ensure that the inner-layer tubular column 1 can only rotate along the axis.

In the embodiment, the thickness of the inner layer pipe column 1 and the outer layer casing 2 is 5mm-10mm, and the inner layer pipe column and the outer layer casing are made of stainless steel, and the preferred thickness is 7 mm. Adopt the stainless steel of suitable thickness to make inlayer tubular column 1 and outer sleeve pipe 2, reinforcing structural strength satisfies the extrusion strength when the operation, and the material of selecting is resistant to wearing.

In this embodiment, the surface of inlayer tubular column 1 and outer tubular column 2 has all been electroplated with metal anticorrosive coating, and metal anticorrosive coating includes zinc-plated coating, tin-plated coating or nickel plating coating etc. scribbles metal anticorrosive coating on the surface of inlayer tubular column 1 and outer tubular column 2, reinforcing corrosion protection and longevity.

In the embodiment, the outer casing 1, the sealing rubber ring 5 and the inner pipe column 2 have strong abrasion resistance, and meet the field requirements.

The utility model discloses an internal rotation backwash oil pipe nipple joint device, the use step mainly includes:

(1) the lower end female coupling 101 of the inner-layer pipe column 1 is connected with a pipe column of a lower oil pipe or other pipe columns of the same-buckling type, and the upper-buckling torque meets the API standard.

(2) The upper end female coupling 101 of the inner tubular column 2 is finally connected to a mud pit by connecting with other tubular columns of the same-buckle type.

(3) And (3) placing the outer casing 2 of the device down at the rubber core of the universal blowout preventer, closing the universal blowout preventer, and starting reverse circulation well washing after the pressure test is qualified.

(4) The inner pipe column 1 is rotated at a reasonable rotating speed by utilizing a drill floor turntable or a top drive, so that the inner pipe column 1 rotates relative to the outer casing 2, and the underground tool is driven to rotate.

The outer casing 2 of the device can be locked by the universal blowout preventer, and the inner pipe column 1 can rotate relative to the outer casing 2 through the bearings 3 at the two ends, so that the inner pipe column 1 can rotate under the action of top drive or a rotary table of a drill floor, and reverse circulation of a shaft and positive rotation of a downhole tool can be realized. The utility model solves the problem that dust sand and crumbs are returned to the well mouth in the process of large amount of sand production of the shaft or overhaul operation grinding, sleeving and milling; the problem of the on-site construction process that the rotation and the reverse circulation are carried out simultaneously is solved, accidents such as pipe column blockage and drill clamping are avoided, the operation timeliness is improved, and the purposes of cost reduction and efficiency improvement are achieved.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The inner rotation backwashing oil pipe nipple device is characterized by comprising an inner pipe column, wherein an outer sleeve is sleeved on the outer side of the inner pipe column, two ends of the inner pipe column respectively extend out of two ends of the outer sleeve, the inner sides of the two ends of the outer sleeve are sleeved on the outer side of the inner pipe column through bearings, an annular protective cover is arranged on the outer side of each bearing, an inner ring of the annular protective cover is abutted to the outer surface of the inner pipe column, and an outer ring of the annular protective cover is fixedly connected with the inner side of the outer sleeve.

2. The pipe nipple device according to claim 1, wherein both ends of said inner tubular string are female couplings.

3. The nipple assembly of claim 2, wherein the profile of the box comprises EU, NU or BGT 2.

4. The nipple device of claim 1, wherein a sealing rubber ring is further provided between said annular protective cover and said bearing.

5. The nipple assembly of claim 1, wherein said annular protective cap is welded integrally to the inside of said outer casing.

6. The nipple device of claim 1, wherein said inner tubular string has a thickness of 5mm to 10 mm.

7. The nipple device of claim 1, wherein said outer casing has a thickness of 5mm to 10 mm.

8. The nipple assembly of claim 1, wherein said inner tubular string and said outer casing are both made of stainless steel.

9. The nipple assembly of claim 8, wherein the surfaces of said inner tubular string and said outer casing are each plated with a metal corrosion-resistant coating.

10. The nipple device of claim 9, wherein said metallic corrosion-resistant coating comprises a zinc-plated coating, a tin-plated coating, or a nickel-plated coating.