Casing plugging device

Abstract

A casing plugging device comprises a center pipe, an upper connector and a lower connector are fixedly installed at the upper end and the lower end of the center pipe, and an upper pressing cap, a rubber sleeve, a lower pressing cap, a cone, a plurality of slips distributed in the circumferential direction, an upper limiting sleeve, a centralizing base and a lower limiting sleeve are sequentially installed on the outer circle face of the center pipe from top to bottom in an up-down sliding mode. The upper end of the inner circle face of each slip is conical, a limiting ring is clamped on the outer circle face of each slip, an upper elastic element is connected between the outer circle face of each slip and the inner circle face of the limiting ring, a plurality of centralizing blocks which are distributed in the circumferential direction and slide in the radial direction are installed on the outer circle face of the centralizing body, and a lower elastic element is connected between the inner circle face of each centralizing block and the outer circle face of the centralizing body. The upper end and the lower end of the centralizing block are clamped in the upper limiting sleeve and the lower limiting sleeve, and a locking mechanism is installed between the lower limiting sleeve and the lower connector. When the interior of the oil pipe is flushed, the oil hole in the sleeve is blocked, water is prevented from being injected into the stratum, and normal oil extraction operation after flushing is guaranteed.

Description

Technical Field

[0001] The utility model relates to oil field production equipment, in particular to a casing plugger. Background Art

[0002] During long-term oil production in oil fields, there are blockages such as wax deposition and agglomeration inside the oil pipes. In order to ensure efficient oil production in the oil fields, the inside of the oil pipes must be flushed.

[0003] The traditional method of flushing the inside of the oil pipe is to inject water between the oil pipe and the casing outside the oil pipe. The water injected between the oil pipe and the casing enters the oil pipe through the reversing well flushing valve at the lower end of the oil pipe and finally flows out from the upper end of the oil pipe, thereby flushing the inside of the oil pipe.

[0004] Because there are oil holes on the wall of the casing, the water injected between the oil pipe and the casing enters the formation through the oil holes. Although this flushing method can flush the inside of the oil pipe, when oil is produced, the water injected into the formation needs to be discharged before normal oil production can be carried out, which seriously affects normal oil production operations. Summary of the Invention

[0005] The utility model is to solve the above technical problems and provides a casing plugger, which can plug the oil holes on the casing when flushing the inside of the oil pipe to prevent water from entering the formation and ensure normal oil production operations after flushing.

[0006] The technical solution of this utility model is:

[0007] The lockhole that is formed on the upper and lower ends of the hinge parts of each end are formed, and the lockhole that is formed on the upper and lower ends of the hinge parts is formed.

[0008] Furthermore, the locking mechanism includes a locking pin fixedly mounted on the outer cylindrical surface of the lower joint, a locking opening provided on the lower limit sleeve, a side opening provided on one side of the locking opening and extending toward the lower end of the lower limit sleeve, the locking pin is located in the locking opening, the lower limit sleeve and the lower joint are locked up and down, the locking pin slides out through the side opening, and the lower limit sleeve and the lower joint are unlocked up and down.

[0009] Furthermore, there are multiple rubber cylinders, and a spacer ring is installed on the outer circumferential surface of the central cylinder between two adjacent rubber cylinders to improve the sealing effect.

[0010] Furthermore, each slip is provided with corrugations distributed up and down on the outer circumferential surface to increase the friction between the slip and the inner circumferential surface of the casing.

[0011] Furthermore, a connecting tube is slidably installed on the outer circumferential surface of the central tube, and the connecting tube is fixedly installed between the pressing cap and the cone.

[0012] Furthermore, the upper elastic element is an arc-shaped spring piece.

[0013] Furthermore, the lower elastic element is a spring.

[0014] The beneficial effects of the utility model are:

[0015] When the oil pipe is in the oil well, the oil hole is blocked by the oil pipe and the oil pump, and the oil pump is turned on the oil pipe, the oil pump is turned off, and the oil pump is turned off. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 yes Figure 1 Enlarged view of part A in the middle;

[0018] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle and lower limit sleeves;

[0019] In the figure: 1-center tube, 2-upper joint, 3-lower joint, 4-upper pressure cap, 5-rubber cylinder, 6-lower pressure cap, 7-connecting cylinder, 8-cone, 9-slip, 10-upper limit sleeve, 11-rightening seat, 12-lower limit sleeve, 13-spacer ring, 14-corrugation, 15-limiting ring, 16-spring, 17-rightening block, 18-spring, 19-locking pin, 20-L-shaped lock. DETAILED DESCRIPTION

[0020] like Figure 1-Figure 3 As shown, a casing plugger comprises a central tube 1, an upper joint 2 and a lower joint 3 are fixedly installed at the upper and lower ends of the central tube 1, an upper pressure cap 4, a rubber cylinder 5, a lower pressure cap 6, a connecting tube 7, a cone 8, a plurality of circumferentially distributed slips 9, an upper limit sleeve 10, a straightening seat 11 and a lower limit sleeve 12 are slidably installed on the outer circular surface of the central tube 1 from top to bottom, the rubber cylinder 5 is multiple, and a spacer ring 13 is slidably installed up and down between two adjacent rubber cylinders 5 on the outer circular surface of the central tube, the lower end of the outer circular surface of the cone 8 is conical, and the upper end of the inner circular surface of each slip 9 is respectively conical with the lower end of the outer circular surface of the cone 8, and the outer circular surface of each slip 9 is respectively provided with corrugations 14 distributed up and down, and the limit is clamped on the outer circular surface of the slip 9 Ring 15, an arc-shaped spring piece 16 is connected between the outer cylindrical surface of each slip 9 and the inner cylindrical surface of the limiting ring 15, a plurality of circumferentially distributed and radially sliding straightening blocks 17 are installed on the outer cylindrical surface of the straightening body, and a spring 18 is connected between the inner cylindrical surface of each straightening block 17 and the outer cylindrical surface of the straightening body. The upper limit sleeve 10 and the lower limit sleeve 12 are fixedly installed at the upper and lower ends of the straightening body, and the upper and lower ends of the straightening block 17 are clamped in the upper limit sleeve 10 and the lower limit sleeve 12. A locking mechanism is installed between the lower limit sleeve 12 and the lower joint 3, and the locking mechanism includes a locking pin 19 fixedly installed on the outer cylindrical surface of the lower joint 3, a locking port 20 provided on the lower limit sleeve 12, and a side opening 20 provided on one side of the locking port 20 and extending from the lower end of the lower limit sleeve 12.

[0021] The working principle of this utility model is:

[0022] First, the reversing well flushing valve is fixed to the lower joint 3 through the extension pipe. The locking pin 19 is positioned in the locking notch 20. The lower limiting sleeve 12 and the lower joint 3 are locked vertically. The friction between the straightening block 17 and the inner surface of the casing is overcome. The casing plug is then inserted downward into the casing so that it is located above the upper oil hole of the casing. The oil pipe is then inserted downward into the center pipe 1. The oil pipe is then rotated to allow the locking pin 19 to disengage the locking notch 20 through the side opening 20. The lower limiting sleeve 12 and the lower joint 3 are unlocked vertically. The upper joint 2 is then lowered. The straightening block 17 expands against the inner surface of the casing due to friction. The upper joint 2 drives the upper pressure cap 4, the rubber sleeve 5, the spacer ring 13, the lower pressure cap 6 connector, and the cone 8 downward. The slips 9 are tightly clamped against the inner surface of the casing under the lateral component of force generated by the tapered upper end of the outer surface of the cone 8. The upper joint 2 is further lowered. The rubber sleeve 5 expands radially outward under the upward and downward squeezing action, expanding and sealing the inner surface of the casing. Water is injected between the oil pipe and the casing. The injected water passes between the oil pipe and the center pipe 1 to the bottom of the oil pipe, and enters the oil pipe under the blocking action of the reversing well flushing valve, and finally flows out from the upper end of the oil pipe to clean the oil pipe. The injected water is blocked in the center pipe 1 and the oil pipe, avoiding injection into the formation when flushing the inside of the oil pipe, ensuring normal oil production operations after flushing.

[0023] The above are only specific embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A casing plugging device, comprising a central tube, with upper and lower joints fixedly mounted at the upper and lower ends of the central tube, characterized in that: An upper pressure cap, a rubber cylinder, a lower pressure cap, a cone, a plurality of circumferentially distributed slips, an upper limit sleeve, a straightening seat and a lower limit sleeve are installed on the outer circular surface of the center tube in sequence from top to bottom. The lower end of the outer circular surface of the cone is conical, and the upper end of the inner circular surface of each slip is respectively a cone that matches the lower end of the outer circular surface of the cone. A limit ring is clamped on the outer circular surface of the slip, and an upper elastic element is connected between the outer circular surface of each slip and the inner circular surface of the limit ring. A plurality of circumferentially distributed and radially sliding straightening blocks are installed on the outer circular surface of the straightening body, and a lower elastic element is connected between the inner circular surface of each straightening block and the outer circular surface of the straightening body. The upper limit sleeve and the lower limit sleeve are fixedly installed on the upper and lower ends of the straightening body, and the upper and lower ends of the straightening block are clamped in the upper limit sleeve and the lower limit sleeve, and a locking mechanism is installed between the lower limit sleeve and the lower joint.

2. The cannula occluder according to claim 1, characterized in that: The locking mechanism includes a locking pin fixedly mounted on the outer circumferential surface of the lower joint, a locking opening arranged on the lower limiting sleeve, and a side opening arranged on one side of the locking opening and extending toward the lower end of the lower limiting sleeve.

3. The cannula occluder according to claim 1, characterized in that: There are multiple rubber cylinders, and a spacer ring is installed on the outer circumference of the central cylinder and is located between two upper and lower adjacent rubber cylinders for sliding up and down installation.

4. The cannula occluder according to claim 1, characterized in that: The outer circumferential surface of each slip is provided with corrugations distributed up and down.

5. The cannula occluder according to claim 1, characterized in that: A connecting tube is slidably installed on the outer circumferential surface of the central tube, and the connecting tube is fixedly installed between the pressing cap and the cone.

6. The cannula occluder according to claim 1, characterized in that: The upper elastic element is an arc-shaped spring piece.

7. The cannula occluder according to claim 1, characterized in that: The lower elastic element is a spring.

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