CN209990471U - Packer for preventing drill sticking - Google Patents

Abstract

The utility model discloses a packer for preventing drill sticking, which comprises a central tube, an upper joint, a lower joint, an upper retainer ring, a lower retainer ring, a rubber cylinder and a drill sticking prevention device; the upper retainer ring is fixed with the central pipe, and the lower retainer ring is in sliding fit with the central pipe; the anti-jamming drilling device comprises a support fixedly arranged on the central rod, an anti-jamming base sleeved outside the cylinder sleeve and in sliding fit with the cylinder sleeve, and an anti-jamming ring arranged at the top of the anti-jamming base, wherein the inner wall of the anti-jamming ring is abutted to the rubber barrel; a supporting plate is arranged at the bottom of the anti-jamming base, and the bottom of the lower piston is abutted to the supporting plate; and a spring is arranged between the supporting plate and the bracket. The utility model provides a rubber cylinder return the card brill problem that the difficulty causes that contracts.

Description

Packer for preventing drill sticking

Technical Field

The utility model relates to a packer, specificly relate to a packer of anti-sticking brill.

Background

The packer is an elastic sealing element and is used for sealing annular spaces between a pipe column and a borehole and between the pipe column and isolating a production zone so as to control production (injection) liquid and protect a downhole tool of a casing pipe; the tool is an important tool for realizing oil and gas field exploitation, can provide an effective mechanical means for normal production of oil and gas wells and smooth implementation of various underground technological measures, and occupies a very important position in the oil and gas field exploration and development process.

At present, in the exploitation of a deep well oil field, the most commonly used compression packer has the main problems that a compression rubber sleeve enters an annular space formed by a packer body and a sleeve after bearing deformation, and the rubber sleeve is difficult to retract after pressure is relieved to form a stuck drill. It is therefore desirable to develop an anti-sticking packer that can assist in the retraction of the packer.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a packer of anti-sticking brill, it can help the packing element to retract.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a packer for preventing drill sticking comprises a central pipe, an upper joint and a lower joint which are fixedly arranged at two ends of the central pipe, and a rubber cylinder assembly sleeved on the central pipe, wherein the rubber cylinder assembly comprises an upper retaining ring and a lower retaining ring which are sleeved on the central pipe, and a rubber cylinder arranged between the upper retaining ring and the lower retaining ring, and a drill sticking prevention device is arranged below the rubber cylinder assembly;

the upper retainer ring is fixedly connected with the central pipe, and the lower retainer ring is in sliding fit with the central pipe; the bottom of the lower retainer ring is provided with a cylinder sleeve which is integrally connected with the lower retainer ring, an upper piston and a lower piston which are mutually abutted are arranged in the cylinder sleeve, the upper piston and the lower piston are sleeved on the central pipe, the abutted end surface of the upper piston and the lower piston is provided with a hydraulic cavity, the central pipe is provided with a liquid flow hole corresponding to the hydraulic cavity,

the anti-sticking drill device comprises a support fixedly arranged on the central pipe, an anti-sticking base sleeved outside the cylinder sleeve and in sliding fit with the cylinder sleeve, and an anti-sticking ring arranged at the top of the anti-sticking base and integrally connected with the anti-sticking base, wherein the anti-sticking ring is sleeved outside the cylinder sleeve; the bottom of the anti-jamming base is bent inwards to form a supporting plate, and the bottom of the lower piston is abutted to the supporting plate; and a spring is arranged between the supporting plate and the bracket.

Further, the height of preventing the snap ring is 1/2 ~ 3/4 of packing element height, the upper portion of preventing the snap ring is the arc inclined plane of outside expansion, the arc inclined plane with be provided with first clearance between the packing element, the middle part of preventing the snap ring with packing element interference fit.

Furthermore, a slip assembly and a supporting ring are further arranged on the central pipe.

Furthermore, the slip assembly comprises a slip seat sleeved on the central pipe, a plurality of slips circumferentially arranged on the slip seat, and a cone arranged above the slips and connected with the central pipe in a sliding manner, wherein the conical surface of the cone is matched with the slips, and the top of the cone is provided with a cylindrical cone seat integrally connected with the cone;

the slip seat is arranged on the central pipe through shear pins, the supporting ring is fixedly arranged on the central pipe, and a second gap is formed between the supporting ring and the slip seat; an annular groove is formed in the bottom wall of the lower piston, and the upper portion of the cone seat is inserted into the annular groove and is in sliding fit with the annular groove;

the support comprises a plurality of support rods which are fixedly arranged on the central pipe along the circumferential direction, a plurality of sliding holes are formed in the cone seat, and the support rods are inserted into the corresponding sliding holes and are in sliding connection with the sliding holes.

Furthermore, a locking ring is arranged on the central tube, a groove is formed in the inner annular wall of the cone seat, and locking teeth which are matched with each other are arranged on the groove wall of the groove and the outer annular wall of the locking ring.

Furthermore, the inner ring wall of the supporting plate is abutted against the outer ring wall of the cone seat.

The utility model has the advantages that: the utility model discloses a setting up and preventing that the snap ring realizes peeling off of packing element and pipe box and the back of contracting of packing element, during the use, prevent that the snap ring moves down under the hydraulic pressure effect and break away from the packing element, do not influence the compression of packing element sealed, behind the pressure release, prevent that the snap ring moves up under the effect of spring and inserts between packing element and the sleeve pipe, help packing element shrink to peel off packing element and sleeve pipe, thereby prevent the card and bore.

The utility model discloses a set up piston and lower piston, go up the piston and upwards compress the packing element, lower piston is released the snap ring downwards, and upper and lower piston moves together, and the snap ring breaks away from the packing element fast when being favorable to pressurizeing.

The utility model discloses packing element and slips assembly have different pistons respectively to control the start-up, only lock the slips, and packing element compression and decompression rely on pressure control, and the intermittent type formula work of the packing element of being convenient for has avoided packing element and slips together to lock the back, and the packing element is in the problem that the life-span that compression state leads to reduces for a long time.

The rubber cylinder assembly of the utility model is compressed upwards, and the rubber cylinder 6 can not be automatically extruded under the gravity action of the rubber cylinder 6 and the lower retainer ring 5, so that the rubber cylinder 6 can not be seated in advance even if the shear pin is not needed to fix the rubber cylinder 6 before the liquid is pumped into the oil well under the packer for pressurization; due to the arrangement of the spring 25, under the elastic force of the spring 15, even if the shear pin is not used for fixing the lower piston 9, the slip assembly cannot be opened in advance.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is an enlarged view taken at A of FIG. 1;

fig. 3 is a schematic structural view of a setting state according to an embodiment of the present invention.

In the figure, 1, a central pipe, 2, an upper joint, 3, a lower joint, 4, an upper retainer ring, 5, a lower retainer ring, 6, a rubber sleeve, 7, a cylinder sleeve, 8, an upper piston, 9, a lower piston, 10, a hydraulic cavity, 11, a liquid flow hole, 12, an anti-blocking base, 13, an anti-blocking ring, 14, a supporting plate, 15, a spring, 16, an arc-shaped inclined surface, 17, a first gap, 18, a supporting ring, 19, a slip seat, 20, a slip, 21, a cone, 22, a cone seat, 23 and a second gap; 24. annular groove, 25, shear pin, 26, support rod, 27, slide hole, 28, lock ring, 29, groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail with reference to the accompanying drawings.

Fig. 1 ~ 3 shows an embodiment of the packer for preventing sticking, which includes a central tube 1, an upper joint 2 and a lower joint 3 fixedly disposed at two ends of the central tube 1, and a rubber cylinder assembly sleeved on the central tube 1, wherein the rubber cylinder assembly includes an upper retaining ring 4, a lower retaining ring 5 sleeved on the central tube 1, and a rubber cylinder 6 disposed between the upper retaining ring 4 and the lower retaining ring 5, and a device for preventing sticking is disposed below the rubber cylinder assembly;

the upper retainer ring 4 is fixedly connected with the central tube 1, and the lower retainer ring 5 is in sliding fit with the central tube 1; the bottom of the lower retainer ring 5 is provided with a cylinder sleeve 7 which is integrally connected with the lower retainer ring 5, an upper piston 8 and a lower piston 9 which are mutually abutted are arranged in the cylinder sleeve 7, the upper piston 8 and the lower piston 9 are sleeved on the central tube 1, a hydraulic cavity 10 is arranged on the abutted end surface of the upper piston 8 and the lower piston 9, a liquid flow hole 11 is arranged on the central tube 1 corresponding to the hydraulic cavity 10,

the anti-sticking drilling device comprises a bracket fixedly arranged on the central tube 1, an anti-sticking base 12 sleeved outside the cylinder sleeve 7 and in sliding fit with the cylinder sleeve 7, and an anti-sticking ring 13 arranged at the top of the anti-sticking base 12 and integrally connected with the anti-sticking base 12, wherein the anti-sticking ring 13 is sleeved outside the rubber cylinder 6; the bottom of the anti-jamming base 12 is bent inwards to form a supporting plate 14, and the bottom of the lower piston 9 is abutted against the supporting plate 14; a spring 15 is arranged between the supporting plate 14 and the bracket. The utility model discloses a setting prevents that snap ring 13 realizes peeling off of packing element 6 and pipe box and the back of contracting of packing element 6, during the use, prevents that snap ring 13 from moving down under the hydraulic pressure effect and breaking away from packing element 6, does not influence the compression of packing element 6 sealed, after the pressure release, prevents that snap ring 13 moves up under the effect of spring 15 and inserts between packing element 6 and the sleeve pipe, and help packing element 6 contracts to peel off packing element 6 and sleeve pipe, thereby prevent the sticking drill. The rubber cylinder assembly of the utility model is compressed upwards, and the rubber cylinder 6 can not be automatically extruded under the gravity action of the rubber cylinder 6 and the lower retainer ring 5, so that the rubber cylinder 6 can not be seated in advance even if the shear pin is not needed to fix the rubber cylinder 6 before the liquid is pumped into the oil well under the packer for pressurization; due to the arrangement of the spring 25, under the elastic force of the spring 15, even if the shear pin is not used for fixing the lower piston 9, the slip assembly cannot be opened in advance.

The utility model discloses a set up piston 8 and lower piston 9, go up piston 8 and upwards compress packing element 6, lower piston 9 is released anti-snap ring 13 downwards, and upper and lower piston moves together, and anti-snap ring 13 breaks away from packing element 6 fast when being favorable to the pressurization.

Further, the height of the snap ring 13 is 1/2 ~ 3/4 the height of the rubber sleeve 6, the upper part of the snap ring 13 is an outwardly expanded arc-shaped inclined plane 16, a first gap 17 is arranged between the arc-shaped inclined plane 16 and the rubber sleeve 6, and the middle part of the snap ring 13 is in interference fit with the rubber sleeve 6.

Furthermore, a slip assembly and a supporting ring 18 are arranged on the central pipe 1.

As a preferred embodiment of the packer of the anti-sticking drill of the present invention, the slip assembly includes a slip seat 19 sleeved on the central tube 1, a plurality of slips 20 circumferentially disposed on the slip seat 19, and a cone 21 disposed above the slips 20 and slidably connected to the central tube 1, wherein a conical surface of the cone 21 is matched with the slips 20, and a cylindrical cone seat 22 integrally connected to the cone 21 is disposed at the top of the cone 21;

the slip seat 19 is arranged on the central pipe 1 through a shear pin 25, the supporting ring 18 is fixedly arranged on the central pipe 1, and a second gap 23 is arranged between the supporting ring 18 and the slip seat 19; an annular groove 24 is formed in the bottom wall of the lower piston 9, and the upper part of the cone seat 22 is inserted into the annular groove 24 and is in sliding fit with the annular groove 24;

the support comprises a plurality of support rods 26 fixedly arranged on the central tube 1 along the circumferential direction, a plurality of sliding holes 27 are formed in the cone seat 22, and the support rods 26 are inserted in the corresponding sliding holes 27 and are in sliding connection with the sliding holes 27.

Furthermore, a locking ring 28 is arranged on the central tube 1, a groove 29 is arranged on the inner annular wall of the cone seat 22, and locking teeth which are matched with each other are arranged on the groove wall of the groove 29 and the outer annular wall of the locking ring 28. The utility model discloses packing element 6 has different pistons respectively with the slips assembly to control the start-up, only locks slips 20, and packing element 6 compression relies on pressure control with decompressing, and the intermittent type formula work of packing element 6 of being convenient for has avoided packing element 6 and slips 20 together to lock the back, and packing element 6 is in the problem that the life-span that compression state leads to reduces for a long time. The utility model discloses slips assembly and packing element assembly are prior art.

Further, the inner annular wall of the retainer plate 14 abuts the outer annular wall of the cone seat 22.

The utility model discloses a use method:

when liquid is pumped into the well, pressure difference is formed between the oil pipe and the casing pipe, the liquid enters the hydraulic cavity 10 from the liquid flow hole 11, the upper piston 8 is pushed to move upwards under the action of pressure to extrude the rubber sleeve 6, and the annular space between the oil pipe and the casing pipe is sealed to realize setting; meanwhile, the lower piston 9 pushes the supporting plate 14 to move downwards to extrude the spring 15, and the anti-clamping ring 13 is quickly separated from the rubber cylinder 6 under the simultaneous action of the upper piston and the lower piston, so that the setting of the rubber cylinder 6 is prevented from being influenced; the lower piston 9 continues to move downwards, and after the lower piston contacts with the cone seat 22, the cone 21 is pushed under the action of pressure to downwards prop open the slip 20, so that the packer is fixed, meanwhile, the locking teeth move downwards to be matched and locked with the locking ring 28, so that the slip 20 is fixed, and after pressure relief is prevented, the slip 20 is retracted and loosened;

after pressure relief, the rubber sleeve 6 moves downwards to reset under the action of self resilience force, meanwhile, the anti-clamping ring 13 moves upwards under the action of the resilience force of the spring 15 and is inserted between the rubber sleeve 6 and the sleeve to help the rubber sleeve 6 to retract, even if the rubber sleeve 6 cannot reset by the resilience force due to over extrusion, the rubber sleeve 6 can also help the rubber sleeve 6 to retract and contract in the anti-clamping ring 13 only by inserting the anti-clamping ring 13 between the rubber sleeve 6 and the sleeve by the upwards movement;

when the packer needs to be taken out, the central pipe 1 is slightly lifted upwards by adopting a fishing tool, and the slip assembly is opened and is in a fixed state with the sleeve, so that the shear pin 25 is broken under the lifting acting force, the slip seat 19 moves downwards, the slip 20 is retracted, the central pipe 1 is lifted again, and the packer can be taken out.

Claims (6)

1. The packer comprises a central pipe (1), an upper joint (2) and a lower joint (3) which are fixedly arranged at two ends of the central pipe (1), and a rubber barrel assembly sleeved on the central pipe (1), wherein the rubber barrel assembly comprises an upper retaining ring (4) and a lower retaining ring (5) which are sleeved on the central pipe (1) and a rubber barrel (6) arranged between the upper retaining ring (4) and the lower retaining ring (5), and is characterized in that a drill-sticking prevention device is arranged below the rubber barrel assembly;

the upper retainer ring (4) is fixedly connected with the central pipe (1), and the lower retainer ring (5) is in sliding fit with the central pipe (1);

the bottom of the lower retainer ring (5) is provided with a cylinder sleeve (7) which is integrally connected with the lower retainer ring (5), an upper piston (8) and a lower piston (9) which are mutually abutted are arranged in the cylinder sleeve (7), the upper piston (8) and the lower piston (9) are sleeved on the central tube (1), a hydraulic cavity (10) is arranged on the end surface where the upper piston (8) and the lower piston (9) are abutted, a liquid flow hole (11) is arranged at the position, corresponding to the hydraulic cavity (10), on the central tube (1),

the anti-sticking drilling device comprises a support fixedly arranged on the central tube (1), an anti-sticking base (12) sleeved outside the cylinder sleeve (7) and in sliding fit with the cylinder sleeve (7), and an anti-sticking ring (13) arranged at the top of the anti-sticking base (12) and integrally connected with the anti-sticking base (12), wherein the anti-sticking ring (13) is sleeved outside the rubber sleeve (6); the bottom of the anti-jamming base (12) is bent inwards to form a supporting plate (14), and the bottom of the lower piston (9) is abutted to the supporting plate (14); a spring (15) is arranged between the supporting plate (14) and the bracket.

2. The anti-sticking packer as claimed in claim 1, wherein the height of the anti-sticking ring (13) is 1/2-3/4 of the height of the rubber sleeve (6), the upper part of the anti-sticking ring (13) is an arc inclined plane (16) expanding outwards, a first gap (17) is arranged between the arc inclined plane (16) and the rubber sleeve (6), and the middle part of the anti-sticking ring (13) is in interference fit with the rubber sleeve (6).

3. An anti-sticking packer as claimed in claim 1, characterised in that a slip assembly and a ring (18) are provided on the base pipe (1).

4. The anti-sticking packer as claimed in claim 3, wherein the slip assembly comprises a slip seat (19) sleeved on the central pipe (1), a plurality of slips (20) circumferentially arranged on the slip seat (19), and a cone (21) arranged above the slips (20) and slidably connected with the central pipe (1), wherein the conical surface of the cone (21) is matched with the slips (20), and the top of the cone (21) is provided with a cylindrical cone seat (22) integrally connected with the cone (21);

the slip seat (19) is arranged on the central pipe (1) through shear pins (25), the supporting ring (18) is fixedly arranged on the central pipe (1), and a second gap (23) is formed between the supporting ring (18) and the slip seat (19);

an annular groove (24) is formed in the bottom wall of the lower piston (9), the upper portion of the cone seat (22) is inserted into the annular groove (24) and is in sliding fit with the annular groove (24),

the support comprises a plurality of support rods (26) which are fixedly arranged on the central pipe (1) along the circumferential direction, a plurality of sliding holes (27) are formed in the cone seat (22), and the support rods (26) are inserted into the corresponding sliding holes (27) and are in sliding connection with the sliding holes (27).

5. A packer against sticking as claimed in claim 4, characterised in that the central tube (1) is provided with a locking ring (28), that the inner annular wall of the cone seat (22) is provided with a groove (29), and that the groove wall of the groove (29) and the outer annular wall of the locking ring (28) are provided with mutually cooperating locking teeth.

6. The anti-sticking packer as claimed in claim 4, wherein the inner annular wall of the retainer plate (14) abuts the outer annular wall of the cone seat (22).

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