CN210422556U

CN210422556U - Multiple setting expansion type fracturing packer

Info

Publication number: CN210422556U
Application number: CN201921257870.1U
Authority: CN
Inventors: 赵锋叶; 常少波; 殷学鹏
Original assignee: Baoji Ruilin Petroleum Electromechanical Equipment Co ltd
Current assignee: Baoji Ruilin Petroleum Electromechanical Equipment Co ltd
Priority date: 2019-08-06
Filing date: 2019-08-06
Publication date: 2020-04-28
Anticipated expiration: 2029-08-06

Abstract

The utility model discloses a many times seat seals expanding fracturing packer, including top connection, packing element subassembly, center tube, packing element, cone, slips body, spring, solid fixed ring, slip seat, piston cylinder, piston, fender ring and lower clutch, the top connection is located the center tube both ends with the lower clutch, packing element subassembly, packing element, cone, slip body, slip seat, piston cylinder from top to bottom the cover locate on the center tube, this packer adopts neck slip seat to support, and the seat of locking piece locking seals the mode, can realize that a string accomplishes many times fracturing repeated anchoring. The rubber cylinder adopts a steel wire curtain framework structure, and the upper end and the lower end of the rubber cylinder are fixed, so that repeated seat sealing of the rubber cylinder is realized. The slip seat adopts shear pin locking, and the mode that the catch is fixed is connected with the center tube, prevents the unexpected seat of slips when going into the well, causes the problem that the packer set in advance, when setting many times, also can prevent the unexpected anchor of slips moreover, guarantees the reliability of instrument operation.

Description

Multiple setting expansion type fracturing packer

Technical Field

The utility model belongs to the technical field of fracturing unit in the pit, concretely relates to many times seat seals expanding fracturing packer.

Background

The bottom seal dragging staged fracturing technology and the continuous oil pipe dragging fracturing technology used in oil fields are one of the important technologies for oil field horizontal well reconstruction. With introduction and wide use of volume fracturing and coiled tubing fracturing technologies, construction displacement and pressure are continuously improved, and the Y211 packer has the problems of high operation difficulty, difficulty in releasing the packer, unreliable seat sealing and the like. The analysis reason is that when the tubular column is lifted and lowered, the Y211 packer slip is lifted and deblocking difficult, and meanwhile, the compression type rubber sleeve is short in setting area due to serious casing damage of the well, so that the patching and setting of a large area cannot be achieved. The expandable K344 packer can meet the large-area setting in the fracturing process, but cannot realize repeated setting and unsetting of a pipe string. Because the string is easy to jump up under the impact of lower pressure in the fracturing process of the string, the K344 packer is structurally provided with no anchoring mechanism and cannot ensure that the string can be seated at a specified position in the fracturing process. The fracturing process cannot be achieved.

SUMMERY OF THE UTILITY MODEL

The utility model provides a prior art not enough, provide an expansion fracturing packer seals many times, satisfied the on-the-spot demand that the seat seals reliably, repeated many times seat, anchoring reliably, the deblocking is thorough, easy operation.

The utility model adopts the technical proposal that: a multi-time setting expansion type fracturing packer comprises an upper joint, a rubber cylinder component, a central tube, a rubber cylinder, a cone, a slip body, a spring, a fixing ring, a slip seat, a piston cylinder, a piston, a baffle ring and a lower joint, wherein the upper joint and the lower joint are sleeved at two ends of the central tube, the rubber cylinder component, the rubber cylinder, the cone, the slip body, the slip seat and the piston cylinder are sleeved on the central tube from top to bottom, one end step of the rubber cylinder is arranged in a step cavity formed by the rubber cylinder component and the central tube in a penetrating manner, the other end step of the rubber cylinder is embedded in the cone, a conical surface of the cone is embedded in a conical hole at one end of the slip body, the slip body is provided with an annular hole deviating from the end part of the cone, the spring is arranged in the annular hole, the outer end of the spring is fixed through the fixing ring, one end of the fixing ring is connected with one end of the slip body, the other end of, its lower tip wears to locate in the piston cylinder, just the slip bowl deviates from slip body one end and is connected with the center tube through locking piece and first pin, piston is passed to first pin one end, the piston sets up in the annular chamber that piston cylinder and slip body formed, keep off the ring cover and locate lower clutch one end, and its upper end offsets with the piston cylinder lower extreme.

Preferably, the packing element includes packing element seat and supporting seat, packing element seat and supporting seat cover are located on the center tube in order, packing element seat upper end offsets with the top connection lower extreme, the supporting seat lower extreme offsets with packing element one end.

Preferably, a first pressure sand prevention channel is arranged at a position, corresponding to the middle of the rubber sleeve, on the central tube, and a second pressure sand prevention channel is arranged at a position, corresponding to the middle of the slip seat, on the central tube.

Preferably, the packing element adopt a steel wire cord curtain skeleton structure, the upper end step of the packing element is fixed on the upper part of the central tube, the lower end of the packing element is fixed in the middle of the central tube through a second pin, O-shaped ring grooves are formed in both ends of an inner hole of the packing element, and O-shaped rings are arranged in the O-shaped ring grooves.

Preferably, the lower end of the piston cylinder is fixed on a step of the lower joint, and the piston cylinder is limited by the retaining ring.

Preferably, the excircle of the piston cylinder is provided with a pressure inlet hole, and the pressure inlet hole pushes the piston to move after pressure is input.

Compared with the prior art, the utility model discloses beneficial effect who has:

1. the packer adopts a neck slip body for supporting, and the slip seat adopts an anchoring mode of locking by a locking block and fixed combination by a first pin, so that repeated anchoring of multiple fracturing can be completed by one string.

2. The rubber cylinder adopts a steel wire curtain framework structure, and the upper end and the lower end of the rubber cylinder are fixed, so that repeated seat sealing of the rubber cylinder is realized.

3. The first sand-proof channel and the second sand-proof channel are arranged, so that the conventional pressure inlet hole is broken, the first sand-proof channel prevents the fracturing sand from entering the cavity of the central tube and the rubber sleeve ring, the rubber sleeve deblocking is influenced, and meanwhile, the fracturing sand is prevented from blocking the pressure inlet hole, so that the pressure cannot enter the space between the central tube and the rubber sleeve, and the rubber sleeve cannot be sealed. The second pressure-inlet sand-prevention channel prevents that the fracturing sand enters the slip seat through the central pipe, so that the slip seat cannot be unfreezed and recycled, and meanwhile, the fracturing sand is prevented from blocking the pressure inlet hole, so that the slips cannot be anchored and sealed

4. The slip seat adopts the shear pin locking, and the mode that the catch is fixed is connected with the center tube, prevents the slips unexpected setting when going into the well, causes the problem that the packer set in advance.

5. The packer deblocking structure adopts a pressure inlet hole structure designed on a piston cylinder. When the deblocking, when oil pipe pressure release or the external pressure of sleeve pipe was greater than oil pipe pressure, pressure got into through the pressure inlet hole on the piston cylinder and promoted the piston motion, prevented moreover that the locking piece from removing the slips anchoring.

Drawings

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

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

A multiple-setting expansion type fracturing packer adopts an optimized and simple structure as a whole, and comprises an upper joint 1, a rubber sleeve component, a central pipe 4, a rubber sleeve 5, a cone 6, a slip body 7, a spring 8, a fixing ring 9, a slip seat 10, a piston cylinder 11, a piston 12, a baffle ring 13 and a lower joint 14, wherein the upper joint 1 and the lower joint 14 are sleeved at two ends of the central pipe 4, namely two ends of the central pipe 4 are respectively connected with the upper joint 1 and the lower joint 14, the rubber sleeve component, the rubber sleeve 5, the cone 6, the slip body 7, the slip seat 10 and the piston cylinder 11 are sleeved on the central pipe 4 from top to bottom, one end step of the rubber sleeve 5 is arranged in a step cavity formed by the rubber sleeve component and the central pipe 4 in a penetrating manner, the other end step of the rubber sleeve is embedded in the cone 6, the conical surface of the cone 6 is embedded in a conical hole at one end of the slip body 7, and the neck of the packer is supported by the slip body 7, the multiple fracturing repeated anchoring of a string is achieved, the end part, deviating from the cone 6, of the slip body 7 is provided with an annular hole, the spring 8 is arranged in the annular hole, the outer end of the spring 8 is fixed through the fixing ring 9, one end of the fixing ring 9 is connected with one end of the slip body 7, the other end of the fixing ring is connected with one end of the slip seat 10, the upper end of the slip seat 10 abuts against the lower end of the slip body 7, the lower end of the slip seat is arranged in the piston cylinder 11 in a penetrating mode, one end, deviating from the slip body 7, of the slip seat 10 is connected with the central pipe 4 through the locking block 15 and the first pin 16, one end of the first pin 16 penetrates through the piston 12, the slip seat 10 is locked through the locking block 15, the anchoring mode of the first pin 16 in fixed combination is connected with the central pipe 4, the problem that the packer is sealed in advance when the well is prevented from being accidentally is solved, and the, the piston 12 is arranged in an annular cavity formed by the piston cylinder 11 and the slip body 10, and the baffle ring 13 is sleeved at one end of the lower joint 14, and the upper end of the baffle ring abuts against the lower end of the piston cylinder 11.

With reference to fig. 1, in order to further realize repeated seating of the rubber cylinder 5, the rubber cylinder assembly includes a rubber cylinder seat 2 and a supporting seat 3, the rubber cylinder seat 2 and the supporting seat 3 are sequentially sleeved on a central tube 4, an upper end of the rubber cylinder seat 2 abuts against a lower end of the upper joint 1, and a lower end of the supporting seat 3 abuts against one end of the rubber cylinder 5. The excircle of the support sleeve 3 is connected with the rubber cylinder 5, the inner hole of the support sleeve is connected with the upper end of the rubber cylinder 5, namely, the upper end of the rubber cylinder 5 penetrates through the inner hole of the support sleeve 3 and is fixedly connected with the central tube 4.

Please refer to fig. 1, in order to prevent the rubber tube 5 and the slip seat 10 from being released successfully. A first pressure sand prevention channel 18 is arranged at the position, corresponding to the middle of the rubber sleeve 5, of the central tube 4, and a second pressure sand prevention channel 19 is arranged at the position, corresponding to the middle of the slip seat 10, of the central tube 4. The setting of first advancing and pressing sand prevention passageway 18 and second advancing and pressing sand prevention passageway 19 has broken the setting mode in conventional pressure inlet hole, and wherein first advancing and pressing sand prevention passageway 18 prevents that the fracturing sand from getting into center tube and packing element 5 annular cavity, and then influences the deblocking of packing element 5, simultaneously, prevents that the fracturing sand from blockking up pressure inlet hole, causes pressure can't get into between center tube 4 and the packing element 5, and then makes the unable deblocking of packing element 5. The second advances and presses sand prevention passageway 19, prevents that the fracturing sand from getting into slip seat 10 through center tube 4 in, causes the unable recovery of unfreezing of slip seat 10, simultaneously, prevents that the fracturing sand from blockking up the pressure inlet hole, and then causes the unable anchoring seat of slip seat 10 to seal.

With reference to fig. 1, in order to further realize the repeated seating of the rubber sleeve 5, the rubber sleeve 5 adopts a steel wire curtain skeleton structure, the upper step of the rubber sleeve 5 is fixed on the upper portion of the central tube 4, the lower end of the rubber sleeve is fixed in the middle of the central tube 4 through a second pin 20, two ends of an inner hole of the rubber sleeve 5 are both provided with O-ring grooves 21, and O-rings 22 are installed in the O-ring grooves 21.

Referring to fig. 1, in order to limit the piston cylinder 11, the lower end of the piston cylinder 11 is fixed on a step of the lower joint 14, and the stop ring 13 is sleeved on the lower joint 14, and one end of the stop ring is abutted against one end of the piston cylinder 11, so as to limit the piston cylinder 11 by the stop ring 13.

Referring to fig. 1, in order to prevent the locking piece 15 from removing the slip bowl 10 and anchoring, a pressure inlet hole 17 is formed on the outer circumference of the piston cylinder 11, and the pressure inlet hole 17 pushes the piston 12 to move after being pressurized, the specific principle is as follows: when deblocking, oil pipe pressure release or when the external pressure of sleeve pipe is greater than oil pipe pressure, pressure gets into through the pressure inlet hole 17 on the piston barrel 11 and promotes the motion of piston 12, and then prevents that locking piece 15 from removing slip seat 10 anchoring.

The working principle of the packer is as follows: the central tube 4 is provided with a first pressure sand prevention channel 18, when the packer is connected to a tubular column for use, and the pressure in the central tube 4 is higher than the annular pressure of an oil sleeve, the rubber sleeve 5 is expanded to be in contact with the inner diameter of the sleeve, so that the annular space of the oil sleeve is sealed and isolated; the slip body 7 extends out and is anchored on the inner wall of the casing pipe, and the control pipe column cannot descend. When the pressure in the central pipe 4 is lower than the annular pressure of the oil sleeve, the rubber sleeve 5 is recovered and unsealed, the slip body 7 is recovered, and the slip body 7 can be forcibly recovered when the pipe column is lifted.

The above-mentioned embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the present invention, so that all equivalent changes made by the contents of the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A multi-setting expansion type fracturing packer is characterized by comprising an upper connector (1), a rubber cylinder assembly, a central tube (4), a rubber cylinder (5), a cone (6), a slip body (7), a spring (8), a fixing ring (9), a slip seat (10), a piston cylinder (11), a piston (12), a baffle ring (13) and a lower connector (14), wherein the upper connector (1) and the lower connector (14) are sleeved at two ends of the central tube (4), the rubber cylinder assembly, the rubber cylinder (5), the cone (6), the slip body (7), the slip seat (10) and the piston cylinder (11) are sleeved on the central tube (4) from top to bottom, one end step of the rubber cylinder (5) penetrates through a step cavity formed by the rubber cylinder assembly and the central tube (4), the other end step of the rubber cylinder is embedded in the cone (6), the conical surface of the cone (6) is embedded in a conical hole at one end of the slip body (7), the end part of the slip body (7) departing from the cone (6) is provided with an annular hole, the spring (8) is arranged in the annular hole, the outer end of the spring (8) is fixed by a fixing ring (9), one end of the fixing ring (9) is connected with one end of the slip body (7), the other end of the slip seat is connected with one end of a slip seat (10), the upper end part of the slip seat (10) is propped against the lower end part of the slip body (7), the lower end part of the slip seat is arranged in the piston cylinder (11) in a penetrating way, one end of the slip seat (10) departing from the slip body (7) is connected with the central tube (4) through a locking block (15) and a first pin (16), one end of the first pin (16) penetrates through the piston (12), the piston (12) is arranged in an annular cavity formed by the piston cylinder (11) and the slip body (7), the baffle ring (13) is sleeved at one end of the lower joint (14), and the upper end of the baffle ring is propped against the lower end of the piston cylinder (11).

2. The multiple-setting expansion type fracturing packer as claimed in claim 1, wherein the rubber cylinder assembly comprises a rubber cylinder base (2) and a supporting base (3), the rubber cylinder base (2) and the supporting base (3) are sequentially sleeved on the central pipe (4), the upper end of the rubber cylinder base (2) abuts against the lower end of the upper joint (1), and the lower end of the supporting base (3) abuts against one end of the rubber cylinder (5).

3. A multi-setting expandable fracturing packer as claimed in claim 2, characterized in that the central tube (4) is provided with a first sand-prevention channel (18) corresponding to the middle of the packing element (5), and the central tube (4) is provided with a second sand-prevention channel (19) corresponding to the middle of the slip seat (10).

4. The multiple setting expansion type fracturing packer as claimed in claim 3, wherein the rubber sleeve (5) is of a steel wire curtain skeleton structure, the upper end step of the rubber sleeve (5) is fixed on the upper portion of the central tube (4), the lower end of the rubber sleeve is fixed in the middle of the central tube (4) through a second pin (20), O-shaped ring grooves (21) are formed in two ends of an inner hole of the rubber sleeve (5), and O-shaped rings (22) are arranged in the O-shaped ring grooves (21).

5. A multi-setting expandable fracture packer as claimed in claim 4, characterized in that the lower end of the piston cylinder (11) is fixed on the step of the lower joint (14), and the piston cylinder (11) is limited by the baffle ring (13).

6. The multiple set expandable fracture packer of claim 5, wherein: and a pressure inlet hole (17) is formed in the excircle of the piston cylinder (11), and the pressure inlet hole (17) pushes the piston (12) to move after pressure inlet.