CN107905740A - A kind of Deep Water Drilling Riser and drilling rod abrasionproof anti-attrition device - Google Patents

Abstract

The invention discloses an anti-friction and anti-friction device for a deep-water drilling water riser and a drill pipe. The device includes a wear-resistant sleeve shell, a straight groove, a semi-capsule-shaped groove, a capsule-shaped roller, a threaded cylindrical central shaft, a central shaft threaded hole, a hexagonal nut, a nut anti-wear washer, a rubber core, a screw hole, and an arc Arch slope, external threaded joint, internal threaded joint, pin hole, pin. The rubber core and the anti-friction sleeve shell are connected with adhesive and nuts. The middle part of the straight groove forms a low-pressure area to separate the drill pipe from the riser. The capsule-shaped roller converts the rotational friction between the drill pipe and the riser into rolling contact. Connect the wear sleeve to the drill pipe with a tapered threaded joint. The advantages of the present invention are: based on the anti-friction and anti-friction device of drill pipe and riser in deepwater drilling, the structure is simple and easy to install. In deepwater drilling operations, the riser and the drill pipe are prone to direct contact and wear.

Description

Anti-friction device for deepwater drilling riser and drill pipe

technical field

The invention relates to the fields of fluid mechanics and oil well drilling and production anti-wear technology, and relates to an anti-wear and anti-friction device for deep-water drilling water risers and drill pipes.

Background technique

In deepwater drilling, the wear of drill pipe and water barrier has always been a problem that plagues drilling technology researchers at home and abroad. When violent ocean currents occur, the riser will be affected by a relatively large deformation, and the riser will contact the drill pipe, and the friction between the rotating drill pipe and the riser will be extremely high. If this friction is not reduced, it may It will cause the riser to rupture, cause accidents, and cause huge losses. Therefore, problems such as drill pipe and riser wear and riser rupture have been paid attention to. For example, Patent No. CN201510517034.2 explores the friction conversion device between the drill pipe and the riser with the ball as the basic structure, but it cannot solve the damage of the drill pipe and the casing when the extrusion collision occurs, and the use of spherical balls is easy When the drilling fluid circulates out of the wellbore, the annular space between the anti-friction sub-section of the drill pipe and the anti-friction sub-section of the riser occupies a large area, which may cause the anti-friction sub-section to be damaged due to excessive impact. Another example is patent CN200810044266.0, the built-in rolling shaft is sealed by a rubber sealing ring, and graphite is used as a lubricant. However, in actual working conditions, the extrusion of the drill pipe and the riser is still hard extrusion, and the sealing function is rotating at high speed. It is easy to fail due to the temperature and elastic fatigue of the rubber under certain conditions, and the sediment will seriously affect the sliding effect of the device after entering the bearing.

Contents of the invention

A deep-water drilling riser and drill pipe anti-wear and anti-friction device, characterized in that it includes an anti-wear sleeve shell (1), a straight groove (2), a semi-capsule-shaped groove (3), and a capsule-shaped roller (4 ), threaded cylindrical central shaft (5), central shaft threaded hole (6), hex nut (7), nut anti-wear washer (8), rubber core (9), drill pipe (10), screw hole (11) , arc arch slope (12), internally threaded joint (13), externally threaded joint (14), pin hole (15), pin (16). The anti-wear sleeve shell (1) is the same two petals, which are locked on the drill pipe (10) by the conical external threaded joint (13) and internal threaded joint (14) matched with the pin (16). The rubber core (9) and the anti-friction casing (1) are connected by adhesive and nut (7), and the rubber core (9) is located between the anti-friction casing (1) and the drill pipe for buffering and anti-wear Effect, make the contact extrusion of drill pipe (10) and water riser become the contact that has buffer with rubber core (9). There are several nut holes (11) at the same positions at both ends of the rubber core (9) and the anti-wear sleeve housing (1), so that the anti-wear sleeve and the rubber core (9) can be fixedly connected with nuts (7). The straight groove (2) is located on the surface of the anti-wear casing (1), and has an arc-shaped arch slope (12) in the middle, which can effectively use fluid power to increase the fluid pressure in the middle of the straight groove and push the drilling tool to move to the center of the borehole. The semi-capsule-shaped groove (3) is located in the middle of the outer surface of the wear-resistant casing (1), is vertical, slightly larger in size than the capsule-shaped roller (4), and has a central shaft threaded hole (6) on the inner wall. The capsule-shaped roller (4) is connected to the corresponding central shaft threaded hole (6) of the anti-wear casing (1) through the threaded cylindrical central shaft (5). The capsule-shaped roller (4) rotates the drill pipe and drills The friction of the riser is converted into rolling friction with minimal loss, fully protecting the safety of the riser. The hexagonal nut and nut anti-wear washer (8) are used to connect the anti-wear sleeve shell (1) and the rubber core (9) for fixing. There is a small chamfer at the opening of the straight groove (2) to reduce the impact of drilling fluid.

The rubber core (9) is made of fluororubber with excellent stability, high temperature resistance and aging resistance. The adhesive adopts MS modified silane adhesive with good storage stability, aging resistance, mechanical properties and temperature resistance. The surface of the inner wall of the straight groove (2) and the surface of the curved arch (12) is electroplated with about 1000 Brinell bright or slightly gray, and has the best wear-resistant white chrome coating.

The anti-friction sleeve shell (1) and the capsule-shaped roller (4) are made of iron-based martensitic alloy with good mechanical processing performance, excellent impact toughness, and good resistance to stress fatigue and cold and heat fatigue. steel.

The rubber core (9) changes the contact extrusion between the drill pipe (10) and the riser into a buffered extrusion contact between the drill pipe (10) and the rubber core (9).

There is an arc-shaped arch slope (12) inside the straight groove (2), and the driving force generated by the increase of fluid pressure in the narrow part of the middle is used to push the drill pipe to the middle of the wellbore, so as to achieve the straightening effect, enhance the lubrication effect, and reduce friction. Both ends of the straight groove (2) have small chamfers, which are used to reduce the impact of drilling fluid and guide the drilling fluid into the straight groove (2).

The capsule-shaped roller (4) converts the friction between the drill pipe (10) and the riser during rotating drilling into rolling friction with minimal loss, and the streamlined design at both ends makes the anti-wear sleeve less impacted by drilling fluid.

The adhesive adopts MS modified silane adhesive with excellent mechanical properties, temperature resistance and anti-aging ability, which is combined with the hex nut (7) which passes through the wear-resistant sleeve shell (1) and rubber core (9) at the same time Work together to ensure that even if the wear sleeve breaks due to the violent collision between the drill pipe and the riser, the wear sleeve will not fall off easily.

Concrete assembly operation steps of the present invention are as follows:

S1: Pass the threaded cylindrical central shaft (5) through the capsule-shaped roller (4), screw the threaded column at one end into the central shaft threaded hole (6) on the inner wall of the capsule-shaped groove (3), and then insert the threaded column The other end of the center shaft (5) is screwed into another center shaft threaded hole (6) on the inner wall of the capsule groove (3) with a special fixture, and the screwing depth is adjusted so that the capsule roller (4) can The threaded cylindrical central shaft (5) is connected to the anti-friction sleeve housing (1) firmly without loosening.

S2: Bond the rubber core (9) and the wear sleeve shell (1) together with an adhesive.

S3: Use the hexagon nut (7) to go through the screw hole (11) to completely connect and fix the anti-wear sleeve and the rubber core (9). The nut anti-wear washer (8) is used to prevent the hexagon nut (7) and the anti-wear sleeve from Friction damage between housings (1) comes off.

S4: Tighten the internal threaded joint to the external threaded joint on the wear-resistant sleeve shell, insert the pin, and lock the device.

The present invention has the following advantages:

The rubber core (9) of the present invention changes the contact extrusion between the drill pipe (10) and the riser into a buffered extrusion contact between the drill pipe (10) and the rubber core (9).

There is an arc-shaped arch slope (12) in the straight groove (2) of the present invention, and the drill pipe (10) is pushed to the middle of the wellbore by the driving force generated by the rise of the fluid pressure in the middle, so as to achieve the straightening effect, enhance the lubrication effect, and reduce friction .

The invention utilizes the capsule-shaped roller (4) to convert the friction between the rotating drill pipe (10) and the deformed water riser into rolling friction with minimal loss, thereby fully protecting the safety of the water riser.

The present invention uses an adhesive to bond the rubber core (9) and the wear-resistant sleeve shell (1). The adhesive uses MS modified silane adhesive with excellent mechanical properties, temperature resistance, aging resistance and flexibility. mixture, which cooperates with the hex nut (7) passing through the wear sleeve shell (1) and the rubber core (9) at the same time to ensure that the wear sleeve breaks even if the drill pipe (10) and the riser are violently collided , the wear-resistant sleeve shell (1) is still glued to the rubber core (9), and will not fall off easily.

The invention utilizes a tapered threaded joint to lock the anti-wear sleeve on the drill pipe, which is less prone to damage and more firm than the general locking hoop.

The invention has simple and practical structure and convenient installation.

Description of drawings

Figure 1 - front view of wear sleeve;

Figure 2 - Sectional view of wear sleeve;

Figure 3 - Sectional view of the arc-shaped ramp in the DC tank;

Figure 4 - Detailed view of the tapered threaded joint;

Figure 5 - top view of wear sleeve;

In the figure: 1-wear sleeve shell, 2-straight groove, 3-semi-capsule-shaped groove, 4-capsule-shaped roller, 5-thread cylindrical central shaft, 6-threaded hole of central shaft, 7-hex nut , 8-nut wear washer, 9-rubber core, 10-drill pipe, 11-screw hole, 12-arc arch slope, 13-internal threaded joint, 14-external threaded joint, 15-pin hole, 16-pin .

Claims (8)

1. A deep-water drilling riser and drill pipe anti-friction and anti-friction device, characterized in that it includes an anti-friction sleeve shell (1), a straight groove (2), a semi-capsule-shaped groove (3), and a capsule-shaped roller (4), threaded cylindrical central shaft (5), central shaft threaded hole (6), hex nut (7), nut anti-wear washer (8), rubber core (9), drill pipe (10), screw hole ( 11), arc-shaped arch slope (12), internal thread joint (13), external thread joint (14), pin hole (15), pin (16), and the wear-resistant sleeve shell (1) is the same two The petal semicircular shell is locked on the drill pipe (10) by the tapered external threaded joint (13) and the internal threaded joint (14) with the pin (16), the rubber core (9) and the wear-resistant casing The body (1) is connected with the adhesive and the nut (7), and the rubber core (9) is located between the anti-wear sleeve shell (1) and the drill pipe (10), which acts as a buffer and anti-wear, so that the drill pipe (10) and the drill pipe (10) The contact extrusion of the riser becomes a buffered contact with the rubber core (9), and there are several nut holes (11) at the same positions at both ends of the rubber core (9) and the wear sleeve shell (1), so that the wear sleeve and the wear sleeve The drill pipe (10) can be fixedly connected with the nut (7). The straight groove (2) is located on the surface of the anti-wear casing (1), and there is an arc-shaped arch (12) in the groove, which can effectively use fluid power to make the straight The pressure of the fluid in the middle of the groove rises, pushing the drilling tool to move toward the center of the borehole. There are small chamfers at both ends of the opening, which can reduce the impact force of the drilling fluid. The semi-capsule-shaped groove (3) is located outside the anti-wear casing (1) The middle part of the surface is vertical, slightly larger than the capsule-shaped roller (4), and the inner wall has a central shaft threaded hole (6). The capsule-shaped roller (4) is connected to the anti-wear sleeve through the threaded cylindrical central shaft (5) In the threaded hole (6) of the corresponding central axis of the housing (1), The hex nut (7) and the nut anti-wear washer (8) are used to connect the anti-wear sleeve shell (1) rubber core (9) with the drill pipe (10) for fixing. 2. A deep-water drilling riser and drill pipe anti-friction device according to claim 1, characterized in that: the rubber core (9) is made of fluororubber with excellent stability, high temperature resistance and aging resistance. The anti-wear sleeve shell (1) and the capsule-shaped roller (4) are made of iron-based martensitic alloy steel with good machining performance, excellent impact toughness, and good resistance to stress fatigue and cold and heat fatigue. . 3. A deep-water drilling riser and drill pipe anti-friction device according to claim 1, characterized in that: the rubber core (9) changes the contact extrusion between the drill pipe (10) and the riser into a drill The rod (10) is in cushioned squeeze contact with the rubber core (9). 4. A deepwater drilling riser and drill pipe anti-friction device according to claim 1, characterized in that: the straight groove (2) has an arc-shaped arch slope (12) inside the groove, which can utilize the fluid in the middle The driving force generated by the pressure rise pushes the drill pipe to the middle of the wellbore to achieve the righting effect, and can enhance the lubrication effect and reduce the friction between the anti-wear sleeve and the riser. 5. According to claim 1, an anti-friction sleeve for the riser in deepwater drilling, characterized in that: the friction between the capsule-shaped roller (4) and the riser when the drill pipe is rotated and drilled is Converted to rolling friction with minimal loss to fully protect the safety of the riser. 6. A deep-water drilling riser and drill pipe anti-wear and anti-friction device according to claim 1, characterized in that: the adhesive uses MS modified silane with excellent mechanical properties, temperature resistance, and anti-aging ability Adhesive, which cooperates with the hexagonal nut (7) passing through the wear sleeve shell (1) and the rubber core (9) at the same time, to ensure that even if the wear sleeve breaks due to the violent collision between the drill pipe and the riser, the wear resistance The cover will not fall off either. 7. A deepwater drilling riser and drill pipe anti-friction device according to claim 1, characterized in that: a tapered internal and external thread joint is used to lock the anti-friction sleeve on the drill pipe (10). 8. According to claims 1 to 7, the specific use process of a deepwater drilling riser and drill pipe anti-friction device includes the following assembly and installation steps: S1: Pass the threaded cylindrical central shaft (5) through the capsule-shaped roller (4), screw the threaded column at one end into the central shaft threaded hole (6) on the inner wall of the capsule-shaped groove (3), and then insert the threaded column The other end of the center shaft (5) is screwed into another center shaft threaded hole (6) on the inner wall of the capsule groove (3) with a special fixture, and the screwing depth is adjusted so that the capsule roller (4) can The threaded cylindrical central shaft (5) is free to rotate on the threaded cylindrical central shaft (5) and the anti-wear sleeve shell (1) is firmly connected without loosening; S2: bonding the contact surfaces of the rubber core (9) and the anti-friction sleeve shell (1) with an adhesive; S3: Use the hexagon nut (7) to go through the screw hole (11) to completely connect and fix the anti-wear sleeve and the rubber core (9). The nut anti-wear washer (8) is used to prevent the hexagon nut (7) and the anti-wear sleeve from The friction between the shells (1) is damaged and falls off; S4: Tighten the internal threaded joint to the external threaded joint on the wear sleeve housing, and insert the pin.