CN211524740U - Novel downhole tool releasing joint - Google Patents

Abstract

A novel releasing joint of a downhole tool. Relates to the technical field of oil field downhole tools. The lower portion of the upper joint is provided with a section of step shaft which is in clearance fit connection with a step hole of the lower joint, the outer circle surface of the step shaft of the upper joint is provided with a plurality of inner counter bores, the inner counter bores correspond to the inner counter bores, the inner surface of the step hole of the lower joint is provided with a plurality of outer counter bores, springs and pin shafts are arranged in the outer counter bores, pistons and the inner counter bores are connected in sealing clearance fit, the outer portions of the pistons are fixedly connected with push rods, the push rods are connected with inner hole clearance fit of the blocking sleeves, and the blocking sleeves are connected. The utility model discloses following beneficial effect has: the steel ball sealing is changed into linear sealing, the sealing area is increased, the sealing effect is improved, meanwhile, the steel ball is small in deformation and cannot be pressed out by a step pressing ring to reduce the sealing performance of the steel ball, the steel ball is locked by the piston and the pin shaft spring, and the steel ball is unlocked by ball throwing and pressure rising, so that the steel ball sealing device has the characteristics of firm locking, simple unlocking, good steel ball sealing performance and long service life.

Description

Novel downhole tool releasing joint

The technical field is as follows:

the utility model belongs to the technical field of the oil field instrument technique in the pit and specifically relates to a novel instrument in the pit joint of giving up.

Background art:

the releasing tool is needed by many industries, generally, a drill rod is used for conveying a certain downhole tool into a well, the downhole tool is conveyed to a preset position, the tool and the drill rod are separated by a rotating or pressure-holding method, and the existing ball type connecting and disconnecting mechanism has the following problems: the contact surface of the two connected parts and the ball is a plane surface rather than a spherical surface which is tightly matched with the ball, and the contact form of the two connected parts and the ball is line contact, so the pressure intensity is extremely high, and the contact is subjected to extremely large acting force, so that local contact deformation is easily generated, the ball is possibly blocked and has the possibility of coming out, and the two connected parts can not be separated from each other when the ball comes out, so the operation requirement can not be effectively realized.

The utility model has the following contents:

in order to solve the problem, the utility model provides a novel downhole tool joint of giving up.

The technical scheme of the utility model is that: a novel releasing joint for a downhole tool comprises an upper joint and a lower joint, wherein an internal thread is arranged on the upper part of the upper joint, an upper central hole is arranged on the lower part of the internal thread, a lower central hole is arranged on the lower part of the upper central hole, the diameter of the upper central hole is larger than that of the lower central hole, an internal thread is arranged on the lower part of the lower joint, a lower central hole is arranged on the upper part of the internal thread, and the diameter of the lower central hole is the same as;

a section of step shaft is arranged at the lower part of the upper joint and is in sealing clearance fit connection with a step hole of the lower joint, a plurality of inner counter bores are formed in the outer circle surface of the step shaft of the upper joint and correspond to the inner counter bores, a plurality of outer counter bores are formed in the inner surface of the step hole of the lower joint, springs and pin shafts are arranged in the outer counter bores, pistons are arranged in the inner counter bores and are in sealing clearance fit connection with the inner counter bores, push rods are fixedly connected to the outer portions of the pistons, the push rods are in clearance fit connection with inner holes of the blocking sleeves, and;

the position size relation among interior counter bore, outer counter bore, spacer sleeve, piston, push rod, round pin axle and the spring lie in: when the outer surface of the piston abuts against the inner surface of the retaining sleeve, the outer end surface of the push rod is positioned on the outer circular surface of the step shaft of the upper joint, and the outer end surface of the pin shaft is positioned on the inner circular surface of the step hole of the lower joint; when the inside of the piston props against the bottom of the inner counter bore, half length of the pin shaft extends into the inner counter bore;

the upper central hole wall of the upper joint is provided with a plurality of liquid inlet holes, and the liquid inlet holes are communicated with the bottoms of the inner counter bores through channels;

the steel balls are arranged on the steps of the upper central hole and the lower central hole.

The steps of the upper central hole and the lower central hole form a spherical ring surface, and the size of the spherical ring surface is the same as that of the outer spherical surface of the steel ball.

The surface roughness of the steel ball and the annular spherical surface is 0.2 um.

The utility model discloses following beneficial effect has: the steel ball sealing is changed into linear sealing, the sealing area is increased, the sealing effect is improved, meanwhile, the steel ball is small in deformation and cannot be pressed out by a step pressing ring to reduce the sealing performance of the steel ball, the steel ball is locked by the piston and the pin shaft spring, and the steel ball is unlocked by ball throwing and pressure rising, so that the steel ball sealing device has the characteristics of firm locking, simple unlocking, good steel ball sealing performance and long service life.

Description of the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a working diagram of the utility model after ball throwing and boosting;

fig. 3 is a schematic diagram of the separation state of the upper joint and the lower joint of the present invention.

In the figure, 1-lower joint, 2-inner counter bore, 3-pin shaft, 4-spring, 5-outer counter bore, 6-channel, 7-liquid inlet hole, 8-upper joint, 9-lower center hole, 10-inner thread, 11-piston, 12-push rod, 13-baffle sleeve, 14-spherical ring surface, 15-steel ball and 16-upper center hole.

The specific implementation mode is as follows:

the present invention will be further explained with reference to the accompanying drawings:

as shown in fig. 1 and fig. 2 to 3, the novel downhole tool releasing joint comprises an upper joint 8 and a lower joint 1, wherein an internal thread 10 is arranged at the upper part of the upper joint 8, an upper central hole 16 is arranged at the lower part of the internal thread 10, a lower central hole 9 is arranged at the lower part of the upper central hole 16, the diameter of the upper central hole 16 is larger than that of the lower central hole 9, an internal thread 10 is arranged at the lower part of the lower joint 1, a lower central hole 9 is arranged at the upper part of the internal thread 10, and the diameter of the lower central hole 9 is the same as that;

a section of step shaft is arranged at the lower part of the upper joint 8 and is in clearance fit connection with a step hole of the lower joint 1 in a sealing way, a plurality of inner counter bores 2 are formed in the outer circle surface of the step shaft of the upper joint 8, the inner counter bores 2 correspond to the positions, a plurality of outer counter bores 5 are formed in the inner surface of the step hole of the lower joint 1, springs 4 and pin shafts 3 are arranged in the outer counter bores 5, pistons 11 are arranged in the inner counter bores 2 and are in clearance fit connection with the inner counter bores 2 in a sealing way, push rods 12 are fixedly connected to the outer parts of the pistons 11, the push rods 12 are in clearance fit connection with inner holes of the blocking;

the position size relation among the inner counter bore 2, the outer counter bore 5, the piston 11, the push rod 12, the blocking sleeve 13, the pin shaft 3 and the spring 4 is as follows: when pressurized liquid enters the bottom of the piston 11, the piston 11 extends out, the outer surface of the piston 11 is propped against the inner surface of the blocking sleeve 13, the outer end surface of the push rod 12 is positioned on the outer circular surface of the step shaft of the upper joint 8, the outer end surface of the pin shaft 3 is positioned on the inner circular surface of the step hole of the lower joint 1, at the moment, the locking effect of the pin shaft 3 is eliminated, and the upper joint 8 and the lower joint 1 are in a separated state; when the hydraulic pressure of the piston 11 is eliminated, the inside of the piston 11 is popped up under the action of the spring 4, the pin shaft 3 pushes the push rod 12, the inside of the piston 11 props against the bottom of the inner counter bore 2, and half of the length of the pin shaft 3 extends into the inner counter bore 2, so that the upper joint 8 and the lower joint 1 are locked;

the wall of an upper center hole 16 of the upper joint 8 is provided with a plurality of liquid inlet holes 7, and the liquid inlet holes 7 are communicated with the bottom of the inner counter bore 2 through a channel 6;

the steel ball 15 is arranged on the step of the upper central hole 16 and the lower central hole 9.

The step of the upper center hole 16 and the lower center hole 9, the ring surface formed by the step is a spherical ring surface 14, the size of the spherical ring surface 14 is the same as that of the outer spherical surface of the steel ball 15, the prior steel ball sealing is changed into linear sealing, the sealing area is increased, the sealing effect is improved, meanwhile, the deformation of the steel ball is small, the pressing mark of the step pressing ring can not be formed, the sealing performance of the steel ball is reduced, and the surface roughness of the steel ball 15 and the annular spherical surface 14 is 0.2um so as to ensure the sealing performance of the steel ball.

Under the condition that no ball is thrown and hydraulic pressure enters the piston, the spring presses the pin shaft to enter the inner counter bore, the upper joint and the lower joint are in a locking state, when the hydraulic pressure-free ball-throwing type oil-well pipe is in practical use, a certain downhole tool is conveyed to enter a well by using the drill rod, the steel ball is thrown into the well after the well is conveyed to a preset position, the steel ball falls onto the spherical annular surface to generate a sealing effect, the pressure in liquid input into the upper joint is increased at the moment, the liquid enters the bottom of the piston through the liquid inlet hole, the piston extends out, the pin shaft is ejected out of the inner counter bore by the ejector rod, the locking effect of the pin shaft is relieved, the hydraulic pressure in the pipe.

In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", and the like, indicate orientations or state relationships based on the orientations or state relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that a designated mechanism or component must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Claims (3)

1. The utility model provides a novel downhole tool joint of giving up, includes top connection (8) and lower clutch (1), its characterized in that: the upper part of the upper joint (8) is provided with an internal thread (10), the lower part of the internal thread (10) is provided with an upper central hole (16), the lower part of the upper central hole (16) is provided with a lower central hole (9), the diameter of the upper central hole (16) is larger than that of the lower central hole (9), the lower part of the lower joint (1) is provided with the internal thread (10), the upper part of the internal thread (10) is provided with the lower central hole (9), and the diameter of the lower central hole (9) is the same as that of the lower central hole (9;

a section of stepped shaft is arranged at the lower part of the upper joint (8) and is in sealing clearance fit connection with a stepped hole of the lower joint (1), a plurality of inner counter bores (2) are formed in the outer circle surface of the stepped shaft of the upper joint (8), the inner counter bores (2) correspond to the positions, a plurality of outer counter bores (5) are formed in the inner surface of the stepped hole of the lower joint (1), springs (4) and pin shafts (3) are arranged in the outer counter bores (5), pistons (11) are arranged in the inner counter bores (2) and are in sealing clearance fit connection with the inner counter bores (2), push rods (12) are fixedly connected to the outer portions of the pistons (11), the push rods (12) are in clearance fit connection with inner holes of blocking sleeves (13), and the blocking sleeves (13) are in threaded;

the position size relation between interior counter bore (2), outer counter bore (5), piston (11), push rod (12), spacer sleeve (13), round pin axle (3) and spring (4) lie in: when the outer surface of the piston (11) is propped against the inner surface of the blocking sleeve (13), the outer end surface of the push rod (12) is positioned on the outer circular surface of the step shaft of the upper joint (8), and the outer end surface of the pin shaft (3) is positioned on the inner circular surface of the step hole of the lower joint (1); when the piston (11) is propped against the bottom of the inner counter bore (2), half of the length of the pin shaft (3) extends into the inner counter bore (2);

the wall of an upper center hole (16) of the upper joint (8) is provided with a plurality of liquid inlet holes (7), and the liquid inlet holes (7) are communicated with the bottom of the inner counter bore (2) through a channel (6);

the steel balls (15) are arranged on the steps of the upper central hole (16) and the lower central hole (9).

2. The novel downhole tool release sub of claim 1, wherein: the steps of the upper central hole (16) and the lower central hole (9) form a spherical ring surface (14), and the size of the spherical ring surface (14) is the same as that of the outer spherical surface of the steel ball (15).

3. The novel downhole tool release sub of claim 1, wherein: the surface roughness of the steel ball (15) and the spherical ring surface (14) is 0.2 um.

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