CN112431558B

CN112431558B - Internal rotation backwashing oil pipe nipple device

Info

Publication number: CN112431558B
Application number: CN202011435510.3A
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: 2025-08-15
Anticipated expiration: 2040-12-10
Also published as: CN112431558A

Abstract

The present invention discloses an inner rotary backwashing oil pipe short joint device, comprising an inner pipe string, an outer casing is sleeved on the outer side of the inner pipe string, the two ends of the inner pipe string extend out of the two ends of the outer casing respectively, the inner sides of the two ends of the outer casing are sleeved on the outer side of the inner pipe string through bearings, an annular protective cover is provided on the outer side of the bearing, the inner ring of the annular protective cover abuts the outer surface of the inner pipe string, and the outer ring of the annular protective cover is fixedly connected to the inner side of the outer casing. The short-circuit device of the present invention can realize the functions of reverse circulation of the wellbore and positive rotation of the downhole tool, so that the pipe string has the function of reverse circulation and flushing while rotating, solving the construction process problem of reverse circulation while rotating on site.

Description

Internal rotation backwashing oil pipe nipple device

Technical Field

The invention relates to a workover tool, in particular to an internal rotation backwashing oil pipe nipple device.

Background

In the process of repairing a well on an offshore platform, a large amount of sand is discharged from a well shaft, a circulating pipeline is required to be connected, a universal blowout preventer is required to be closed, reverse circulation well flushing is required to be carried out, a better bottom hole sand flushing effect is achieved, even a pipe column is required to be additionally provided with a rotating function, and in the process of grinding, sleeving and milling in overhaul operation, the pipe column is required to be provided with a function of carrying scraps to the well head well in order to enable the well repairing liquid to be capable of carrying scraps well, and the pipe column is required to be provided with a function of reverse circulation flushing while rotating, milling and flushing. Because the annulus cross section of the current tubular column is far larger than the tubular column cross section, the positive circulation flushing effect is not good in reverse circulation effect under the same displacement, but the existing equipment in the market can only meet the requirement that the tubular column rotates and simultaneously performs positive circulation well flushing. For example, the Chinese patent with publication number CN106368630B and publication day 2019.3.22 discloses a sand washing method and a special tool, which can only meet the requirement that a pipe column rotates and simultaneously washes a well in a positive circulation mode, so that in order to better carry dust and sand or scraps to a wellhead in the processes of sand discharge, overhaul operation grinding, sleeving and milling aiming at a shaft, the pipe column with the function of rotating and reversely washing is needed, and the construction process problem that the reverse circulation is performed while rotating is solved on site.

Disclosure of Invention

The invention designs an internal rotation backwashing oil pipe nipple device, which can realize the functions of reverse circulation of a shaft and forward rotation of a downhole tool, so that a pipe column has the functions of reverse circulation flushing while rotating, and the construction process problems of reverse circulation while rotating on site are solved.

The technical scheme of the invention is as follows:

The utility model provides an internal rotation backwash oil pipe nipple device, includes inlayer tubular column, inlayer tubular column outside has cup jointed outer sleeve pipe, the both ends of inlayer tubular column stretch out respectively outer sheathed tube both ends, outer sheathed tube both ends inboard all cup joints the outside of inlayer tubular column through the bearing, be equipped with annular visor on the outside of bearing, annular visor's inner ring with inlayer tubular column's surface butt, annular visor's outer loop with outer sheathed tube inboard fixed connection.

The two ends of the inner pipe column are externally connected with other pipe columns, the outer pipe sleeve is locked by the universal blowout preventer, the outer pipe sleeve can rotate relative to the inner pipe column through the bearing, at the moment, the inner pipe column can rotate relative to the outer pipe sleeve under the action of a top drive or a rotary table of a drill floor, reverse circulation of a shaft is realized, forward rotation of a downhole tool is realized, and the pipe column has a reverse circulation flushing function while rotating. The annular protective covers on the two end faces of the inner pipe column limit the axial movement direction of the inner pipe column, and can prevent debris from falling into the bearing to affect relative rotation.

Further, both ends of the inner pipe column are female couplings. The two ends of the inner pipe column are connected with other outer connecting pipe columns through female couplings.

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

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

Further, 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 pipe column is 5mm-10mm.

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

Further, the inner tubular column and the outer sleeve are both made of stainless steel.

The inner pipe column and the outer sleeve are made of stainless steel with proper thickness, so that the structural strength is enhanced, the extrusion strength during operation is met, and materials are selected and wear-resistant.

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

Further, the metal corrosion-resistant coating comprises a zinc plating coating, a tin plating coating or a nickel plating 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 beneficial effects of the invention are as follows:

According to the structure of the internal rotation backwashing oil pipe nipple device, the universal blowout preventer can lock the outer casing of the device, and the inner pipe column can rotate relative to the outer casing through the bearings at the two ends, so that the inner pipe column can rotate under the action of a top drive or a turntable of a drill floor, and reverse circulation of a shaft and forward rotation of a downhole tool can be realized. The invention solves the problems of dust sand and debris flowing back to the wellhead during the processes of grinding, sleeving and milling during the large-scale sand discharge or overhaul of the shaft, solves the problem of reverse circulation while rotating in the field construction process, avoids accidents such as pipe column blocking, drill sticking and the like, improves the operation time efficiency, and achieves the purposes of reducing the cost and enhancing the efficiency.

Drawings

FIG. 1 is a schematic view of the construction of the 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, an inner pipe column 1, a female coupling 101, an outer sleeve 2, a bearing 3, an annular protective cover 4 and a sealing rubber ring 5 are arranged.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent, and certain components of the drawings may be omitted, enlarged or reduced in order to better illustrate the present embodiments, and do not represent the actual product size, and it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationship depicted in the drawings is for illustrative purposes only and is not to be construed as limiting the present patent.

Example 1:

As shown in fig. 1-3, an internal rotation backwash oil pipe nipple device comprises an inner pipe column 1, wherein an outer sleeve 2 is sleeved on the outer side of the inner pipe column 1, two ends of the inner pipe column 1 respectively extend out of two ends of the outer sleeve 2, two ends of the inner pipe column 1 are female couplings 101, inner sides of two ends of the outer sleeve 2 are sleeved on the outer side of the inner pipe column 1 through bearings 3, annular protective covers 4 are arranged on the outer sides of the bearings 3, inner rings of the annular protective covers 4 are abutted with the outer surfaces of the inner pipe column 1, and outer rings of the annular protective covers 4 are fixedly connected with the inner sides of the outer sleeve 2.

In this embodiment, the button of the female coupling 101 includes common buttons such as EU, NU, or BGT2, which are consistent with the button 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 tightness between the inner pipe column 1 and the outer sleeve 2, and prevent external debris from affecting the bearing.

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

In this embodiment, the annular protective covers 4 and the sealing rubber rings 5 at the two ends limit the movement direction of the inner pipe column 1, so as to ensure that the inner pipe column 1 can only rotate along the axis.

In this embodiment, the inner tubular column 1 and the outer casing 2 are each 5mm to 10mm thick and are each made of stainless steel, preferably 7mm thick. The inner pipe column 1 and the outer pipe 2 are made of stainless steel with proper thickness, so that the structural strength is enhanced, the extrusion strength during operation is met, and materials are selected and wear-resistant.

In this embodiment, the surfaces of the inner layer pipe column 1 and the outer layer pipe column 2 are all electroplated with metal anti-corrosion coatings, and the metal anti-corrosion coatings comprise a galvanized coating, a tinning coating or a nickel plating coating, and the like, and the surfaces of the inner layer pipe column 1 and the outer layer pipe column 2 are coated with metal anti-corrosion coatings, so that the anti-corrosion performance is enhanced, and the service life is prolonged.

In the embodiment, the outer sleeve 1, the sealing rubber ring 5 and the inner pipe column 2 have strong wear resistance, and the field requirement is met.

The invention relates to an internal rotation backwashing oil pipe nipple device, which mainly comprises the following using steps:

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

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

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

(4) And the drill floor turntable or the top drive is utilized to keep reasonable rotation speed to rotate the inner pipe column 1, so that the inner pipe column 1 rotates relative to the outer casing 2, and the downhole tool is driven to rotate.

The universal blowout preventer can lock the outer casing 2 of the device, and as the inner pipe column 1 can rotate relative to the outer casing 2 through the bearings 3 at the two ends, the inner pipe column 1 can rotate under the action of a top drive or a turntable of a drill floor, so that the reverse circulation of a shaft and the forward rotation of a downhole tool can be realized. The invention solves the problems of dust sand and debris flowing back to the wellhead during the processes of grinding, sleeving and milling during the large-scale sand discharge or overhaul of the shaft, solves the problem of reverse circulation while rotating in the field construction process, avoids accidents such as pipe column blocking, drill sticking and the like, improves the operation time efficiency, and achieves the purposes of reducing the cost and enhancing the efficiency.

It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims

1. An internal rotary backwash tubing nipple device, characterized in that it comprises an inner tubing string, an outer casing is sleeved on the outer side of the inner tubing string, two ends of the inner tubing string respectively extend out from the two ends of the outer casing, the inner sides of both ends of the outer casing are sleeved on the outer side of the inner tubing string through bearings, an annular protective cover is provided on the outer side of the bearing, the inner ring of the annular protective cover abuts against the outer surface of the inner tubing string, and the outer ring of the annular protective cover is fixedly connected to the inner side of the outer casing; the outer casing is used to be locked by a universal blowout preventer; both ends of the inner tubing string are female couplings, and the female couplings are used to connect with other external tubing strings;

The steps for use include:

(1) The female coupling at the lower end of the inner tubing string is connected to the tubing string of the lower oil pipe or other tubing strings of the same threading type, and the threading torque meets the API standard;

(2) The upper end female coupling of the inner pipe string is connected to other pipe strings of the same buckle type and finally connected to the mud pool;

(3) Place the outer casing under the rubber core of the universal blowout preventer, close the universal blowout preventer, and start reverse circulation well washing after the pressure test is passed;

(4) Using the drill floor turntable or top drive, the inner tubing is rotated at a reasonable speed so that the inner tubing rotates relative to the outer casing, thereby driving the downhole tool to rotate.

2. The short joint device according to claim 1, characterized in that the buckle type of the female coupling includes EU, NU or BGT2.

3. The short section device according to claim 1, characterized in that a sealing rubber ring is further provided between the annular protective cover and the bearing.

4. The short joint device according to claim 1, characterized in that the annular protective cover is welded to the inner side of the outer casing as a whole.

5. The short joint device according to claim 1, characterized in that the thickness of the inner pipe string is 5mm-10mm.

6. The pup joint device according to claim 1, characterized in that the thickness of the outer casing is 5mm-10mm.

7. The pup joint device according to claim 1, wherein the inner tubular string and the outer casing are both made of stainless steel.

8. The pup joint device according to claim 7, wherein the surfaces of the inner pipe string and the outer casing are both electroplated with a metal anti-corrosion coating.

9. The short joint device according to claim 8, characterized in that the metal anti-corrosion coating includes a galvanized coating, a tinned coating or a nickel-plated coating.