CN218816323U

CN218816323U - Dual-purpose packer for underground fracturing and water injection

Info

Publication number: CN218816323U
Application number: CN202222239083.2U
Authority: CN
Inventors: 陈飞龙; 徐婷婷; 赵金金; 戴兵; 王怡淦; 陈云震; 皋师; 杨成
Original assignee: Jiangsu Tenglong Petrochemical Machinery Co ltd
Current assignee: Jiangsu Tenglong Petrochemical Machinery Co ltd
Priority date: 2022-08-24
Filing date: 2022-08-24
Publication date: 2023-04-07
Anticipated expiration: 2032-08-24

Abstract

The utility model discloses a dual-purpose packer of fracturing in pit, water injection belongs to the packer field. Including the center tube, the top fixedly connected with top connection of center tube, the bottom fixedly connected with lower clutch of center tube, the fixed sheath that has cup jointed in the bottom circumference outside of top connection, the fixed lower sheath that has cup jointed in the top circumference outside of lower clutch, the fixed capsule that has cup jointed in the circumference outside of center tube, the top and the last sheath fixed connection of capsule, the bottom and the lower sheath fixed connection of capsule, be formed with sealed chamber between center tube and top connection, lower clutch, the last sheath, lower sheath, the capsule, the top and the bottom of top connection have all been seted up and have been passed the pressure hole, the inside fixedly connected with well-flushing mechanism who goes up the sheath compares with prior art, and this application can use in two circumstances degrees of fracturing and water injection.

Description

Dual-purpose packer for underground fracturing and water injection

Technical Field

The utility model relates to a packer field, concretely relates to dual-purpose packer of fracturing in pit, water injection.

Background

When a multilayer reservoir is developed, the reservoir is usually divided into multiple layers in advance, then a water injection packer is used for separating each production layer, and then a water distributor is used for injecting water into each single layer respectively, so that the oil extraction speed and the oil extraction rate of the reservoir are improved. The fracturing packer is used for carrying out fracturing operation in the fracturing process of an oil and gas well so as to be convenient for the oil and gas well to better exploit the auxiliary device of oil and gas, and is widely used in the field of oil and gas exploitation.

In the prior art, a packer can only be used for fracturing or water injection and can only be used under a certain condition, so that the packer for both underground fracturing and water injection is necessary to be designed.

SUMMERY OF THE UTILITY MODEL

The utility model provides a to prior art not enough, the utility model provides a dual-purpose packer of fracturing in pit, water injection.

The purpose of the utility model can be realized by the following technical proposal: a packer for underground fracturing and water injection comprises a central tube, wherein the top of the central tube is fixedly connected with an upper joint, the bottom of the central tube is fixedly connected with a lower joint, the outer side of the circumference of the bottom of the upper joint is fixedly sleeved with an upper sheath, the outer side of the circumference of the top of the lower joint is fixedly sleeved with a lower sheath, the outer side of the circumference of the central tube is fixedly sleeved with a rubber cylinder, the top end of the rubber cylinder is fixedly connected with the upper sheath, the bottom end of the rubber cylinder is fixedly connected with the lower sheath, a sealing cavity is formed among the central tube, the upper joint, the lower joint, the upper sheath, the lower sheath and the rubber cylinder, and a well washing mechanism is fixedly connected inside the upper sheath;

the well washing mechanism comprises an upper well washing valve, a well washing pin, a convex block and a lower well washing valve; the upper well flushing valve is connected with the upper connector through a well flushing pin, the upper well flushing valve is in threaded connection with the lower well flushing valve, a convex block is arranged inside the upper well flushing valve, and an outer boss capable of limiting the descending distance of the well flushing mechanism is arranged at the tops of the lower well flushing valve and the central pipe.

Furthermore, the outer wall of the central tube is provided with a through hole, and a sand prevention part is movably clamped inside the through hole.

Furthermore, both sides of the inner wall of the through hole are provided with grooves, the front surface of the inner wall of each groove is rotatably connected with a baffle through a connecting rod, the front surface of the inner wall of each groove is welded with a U-shaped block, and the front surface of the inner wall of each groove is provided with a fixing groove.

Furthermore, the surface both sides of sand control spare all weld the connecting block, the positive surface activity of baffle is run through and is had the staple, two the one end of keeping away from the sand control spare of connecting block activity joint respectively in the inside of U type piece.

Further, the fixing grooves are matched with the fixing nails.

Further, the central pipe with all be provided with the sealing washer between the top connection with the lower clutch, go up the sheath with between the top connection, the sheath with all be provided with the sealing washer between the lower clutch.

The utility model has the advantages that:

in the setting process, the well washing mechanism can ensure effective communication of annular spaces at the upper end and the lower end of the central pipe without movement, so that the setting pressure is reduced, and the influence of a high-pressure layer on the setting pressure is eliminated; after the setting is in place, the lifting pressure is continuously carried out to cut off the well washing pin, the well washing mechanism descends to the outer boss of the central pipe, and the convex block and the central pipe are matched to seal the well washing channel, so that the setting reliability of the packer is ensured.

When needing to protect the packer, at first dock sand control spare and through-hole for the connecting block is in the inside of U type piece, later rotates the baffle, and at last through the staple, the originally last through-hole of protection packer improves the life of packer, prevents because of the through-hole of current packer can lead to the through-hole to enlarge because of the reason of taking the sand fluid under long-time use, influences the life of packer.

Drawings

The present invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram of the present application;

FIG. 2 is a schematic view of a well flushing mechanism of the present application;

FIG. 3 is a schematic view of the present application at a through hole;

the parts corresponding to the reference numerals in the figures are as follows: 1. a central tube; 2. an upper joint; 3. a lower joint; 4. putting a sheath; 5. a lower sheath; 6. a rubber cylinder; 7. sealing the cavity; 8. a well washing mechanism; 81. an upper well-flushing valve; 82. washing the well pin; 83. a convex block; 84. a downhole flushing valve; 85. an outer boss; 91. a through hole; 92. a sand control member; 93. A groove; 94. a baffle plate; 95. a U-shaped block; 96. fixing grooves; 97. connecting blocks; 98. and (5) fixing the nail.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

In a specific embodiment, as shown in fig. 1, a packer for both downhole fracturing and water injection comprises a central tube 1, wherein an upper joint 2 is fixedly connected to the top of the central tube 1, a lower joint 3 is fixedly connected to the bottom of the central tube 1, an upper sheath 4 is fixedly sleeved on the outer side of the bottom circumference of the upper joint 2, a lower sheath 5 is fixedly sleeved on the outer side of the top circumference of the lower joint 3, a rubber cylinder 6 is fixedly sleeved on the outer side of the circumference of the central tube 1, the top end of the rubber cylinder 6 is fixedly connected with the upper sheath 4, the bottom end of the rubber cylinder 6 is fixedly connected with the lower sheath 5, a sealed cavity 7 is formed between the central tube 1 and the upper joint 2, the lower joint 3, the upper sheath 4, the lower sheath 5 and the rubber cylinder 6, and a well washing mechanism 8 is fixedly connected inside the upper sheath 4; the water injection pipe column is put into the shaft, and clean water is pumped into the water injection pipe column, so that a part of the clean water continuously flows to the bottom of the well after flowing through the inner cavities of the upper joint 2, the central pipe 1 and the lower joint 3. And the other part of clear water flows into a sealing cavity 7 formed by the central pipe 1, the upper joint 2, the lower joint 3, the upper sheath 4, the lower sheath 5 and the packing element 6 through the through hole 91 in the central pipe 1 so as to expand the packing element 6, so that the outer wall of the packing element 6 is propped against the inner wall of the shaft casing, and the packer is seated on the inner wall of the shaft casing.

In a particular embodiment, as shown in fig. 2, the well flushing mechanism 8 includes an upper well flushing valve 81, a well flushing pin 82, a convex block 83, and a lower well flushing valve 84; the upper well flushing valve 81 is connected with the upper connector 2 through a well flushing pin 82, the upper well flushing valve 81 is in threaded connection with the lower well flushing valve 84, a convex block 83 is arranged inside the upper well flushing valve 81, and an outer boss 85 capable of limiting the descending distance of the well flushing mechanism 8 is arranged at the top of the lower well flushing valve 84 and the top of the central pipe 1. When the well is washed, liquid flow enters through the upper sheath 4, the upper well washing valve 81 and the lower well washing valve 84 are pushed to move upwards, the sealing of the convex block 83 is removed, and the liquid flow is transmitted to an oil layer at the lower part of the rubber cylinder 6 through the sealing cavity 7. When needing to protect the packer, at first dock sand control spare and through-hole for the connecting block is in the inside of U type piece, later rotates the baffle, and at last through the staple, the originally last through-hole of protection packer improves the life of packer, prevents because of the through-hole of current packer can lead to the through-hole to enlarge because of the reason of taking the sand fluid under long-time use, influences the life of packer.

In a specific embodiment, as shown in fig. 3, the outer wall of the central tube 1 is provided with a through hole 91, and a sand control member 92 is movably clamped inside the through hole 91. Recess 93 has all been seted up to the inner wall both sides of through-hole 91, the positive surface of the inner wall of recess 93 rotates through the connecting rod and is connected with baffle 94, the positive surface welding of the inner wall of recess 93 has U type piece 95, fixed slot 96 has been seted up on the positive surface of the inner wall of recess 93. Connecting blocks 97 are welded on two sides of the outer surface of the sand control member 92, fixing nails 98 penetrate through the front surface of the baffle 94, and the connecting blocks 97 are movably clamped inside the U-shaped block 95 at one ends far away from the sand control member 92 respectively. The fixing groove 96 is matched with the fixing nail 98. The sealing rings are arranged between the central pipe 1 and the upper joint 2 and between the upper joint 3 and the lower joint 3, and the sealing rings are arranged between the upper sheath 4 and the upper joint 2 and between the lower sheath 5 and the lower joint 3. When needing to protect the packer, at first dock sand control spare 92 and through-hole 91 for connecting block 97 is in U type piece 95's inside, later rotates baffle 94, and through set pin 98 at last, this last through-hole 91 of protection packer improves the life of packer, prevents because of the through-hole 91 of current packer can lead to the through-hole 91 to enlarge because of the reason of taking the sand liquid under long-time use, influences the life of packer.

The working principle of the present invention is specifically described below: and (3) putting the water injection pipe column into the shaft, and pumping clean water into the water injection pipe column, so that a part of the clean water continuously flows to the bottom of the well after flowing through the inner cavities of the upper joint 2, the central pipe 1 and the lower joint 3. And the other part of clear water flows into a sealing cavity 7 formed by the central pipe 1, the upper joint 2, the lower joint 3, the upper sheath 4, the lower sheath 5 and the packing element 6 through the through hole 91 in the central pipe 1 so as to expand the packing element 6, so that the outer wall of the packing element 6 is abutted against the inner wall of the shaft casing, and the packer is seated on the inner wall of the shaft casing.

And after the packer is set, pumping sand-carrying fluid into the water injection string (at the moment, stopping pumping clean water) so as to perform fracturing operation on the underground oil layer. In the process, because the sand control element 92 is arranged on the base pipe 1, sand in the sand carrying liquid directly flows downwards in the inner cavity of the base pipe 1 and does not enter the seal cavity 7.

After the fracturing operation is finished, the pump is stopped, so that the liquid in the sealing cavity 7 flows back to the central pipe 1 under the action of pressure difference, the rubber sleeve 6 is rebounded, and the packer is unsealed. Subsequently, a flushing fluid is pumped into the annular space between the water injection string and the wellbore casing to backwash the water injection string to wash out residual sand particles in the water injection string.

When a well is washed, liquid flow enters through the upper sheath 4, the upper well washing valve 81 and the lower well washing valve 84 are pushed to move upwards, the convex blocks 83 are removed from sealing, and the liquid flow is transmitted to an oil layer at the lower part of the rubber cylinder 6 through the sealing cavity 7.

In the description of the present invention, it is to be understood that the terms "open hole", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc. indicate an orientation or positional relationship only for the convenience of description of the present invention and to simplify the description, and do not indicate or imply that the component or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description of the present specification, reference to the description of "one embodiment," "an example," "a specific example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing shows and describes the basic principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A packer for underground fracturing and water injection is characterized by comprising a central tube, wherein the top of the central tube is fixedly connected with an upper joint, the bottom of the central tube is fixedly connected with a lower joint, the outer side of the bottom circumference of the upper joint is fixedly sleeved with an upper sheath, the outer side of the top circumference of the lower joint is fixedly sleeved with a lower sheath, the outer side of the circumference of the central tube is fixedly sleeved with a rubber cylinder, the top end of the rubber cylinder is fixedly connected with the upper sheath, the bottom end of the rubber cylinder is fixedly connected with the lower sheath, a sealing cavity is formed among the central tube, the upper joint, the lower joint, the upper sheath, the lower sheath and the rubber cylinder, and a well washing mechanism is fixedly connected inside the upper sheath;

the well flushing mechanism comprises an upper well flushing valve, a well flushing pin, a convex block and a lower well flushing valve; the upper well washing valve is connected with the upper connector through a well washing pin, the upper well washing valve is in threaded connection with the lower well washing valve, a convex block is arranged inside the upper well washing valve, and an outer boss capable of limiting the descending distance of the well washing mechanism is arranged on the tops of the lower well washing valve and the central pipe.

2. The packer for both downhole fracturing and water injection as claimed in claim 1, wherein the outer wall of the central tube is provided with a through hole, and a sand control element is movably clamped inside the through hole.

3. The packer for both underground fracturing and water injection as claimed in claim 2, wherein both sides of the inner wall of the through hole are provided with grooves, the front surface of the inner wall of each groove is rotatably connected with a baffle through a connecting rod, a U-shaped block is welded on the front surface of the inner wall of each groove, and a fixing groove is formed on the front surface of the inner wall of each groove.

4. The packer for both downhole fracturing and water injection as claimed in claim 3, wherein connecting blocks are welded on both sides of the outer surface of the sand control member, a fixing nail penetrates through the front surface of the baffle movably, and one ends of the two connecting blocks, which are far away from the sand control member, are respectively and movably clamped inside the U-shaped block.

5. The dual-purpose packer for fracturing and injecting water in a well as claimed in claim 4, wherein the fixing groove is matched with the fixing nail.

6. The packer of claim 1, wherein sealing rings are arranged between the central pipe and the upper joint and between the central pipe and the lower joint, and sealing rings are arranged between the upper sheath and the upper joint and between the lower sheath and the lower joint.