CN111764865A

CN111764865A - Soluble end cap of pump sending

Info

Publication number: CN111764865A
Application number: CN202010790526.XA
Authority: CN
Inventors: 沈夺为
Original assignee: Shenzhen Baitu Petroleum Technology Service Co ltd
Current assignee: Shenzhen Baitu Petroleum Technology Service Co ltd
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2020-10-13

Abstract

A pumping soluble plug relates to the technical field of oil and gas well tools. It comprises the following steps: the soluble bridge plug is used for being located at a preset locating short section in the oil pipe under the action of hydraulic pressure in the oil pipe; and the soluble locking device is assembled on the soluble bridge plug, is positioned at the upper end of the soluble bridge plug when in use, and is used for carrying the soluble bridge plug to reach and lock the soluble locking device at the preset landing nipple under the action of pressing or self gravity. Be provided with a plurality of steps on the preset seat nipple joint, soluble locking device includes: a shaft body assembled at one end of the soluble bridge plug; and a plurality of elastic fastening parts which are arranged on the outer side of the shaft body and are used for being fastened with the steps. By adopting the technical scheme, the steel wire welding machine has the advantages of eliminating the hidden danger of steel wire operation, saving the operation time, reducing the operation cost and having wide application range.

Description

Soluble end cap of pump sending

Technical Field

The invention relates to the technical field of oil and gas well tools, in particular to a pumping soluble plug.

Background

In current completion operations, it is generally necessary to run packers to isolate the hydrocarbons in the underlying production zone in order to protect the casing. The existing production packer generally adopts hydraulic setting, a temporary plug is required to be put under an oil pipe to plug the bottom of the oil pipe in the setting process, and the packer is taken out after the setting is finished so as to ensure that oil gas flows to the ground from the oil pipe. After the oil pipe is pressed and sealed, the temporary plug below the oil pipe is taken out, and the oil gas can be guaranteed to flow to the ground from the oil pipe. Thus, at least 2-4 wireline operations are required to set the production packer. However, the wire work has many disadvantages: long operation time, high operation cost, inapplicability to inclined shafts and hidden operation troubles (such as knotting, breaking and easy hooking). Therefore, improvements are desired.

Disclosure of Invention

The invention aims to overcome the defects and shortcomings of the prior art, and provides a pumping soluble plug which has the advantages of eliminating the hidden trouble of steel wire operation, saving the operation time, reducing the operation cost and having wide application range.

In order to achieve the purpose, the invention adopts the technical scheme that: a pumping soluble plug comprising: the soluble bridge plug is used for being located at a preset locating short section in the oil pipe under the action of hydraulic pressure in the oil pipe; and the soluble locking device is assembled on the soluble bridge plug, is positioned at the upper end of the soluble bridge plug when in use, and is used for carrying the soluble bridge plug to reach and lock the soluble locking device at the preset landing nipple under the action of pressing or self gravity.

The soluble locking device comprises: a shaft body assembled at one end of the soluble bridge plug; and the elastic fastening parts are arranged on the outer side of the shaft body and used for being fastened with the steps on the preset sitting short section.

Elastic fastening portion includes two first bellying and the second bellying that sets up along axial interval, the interval between first bellying and the second bellying with step looks adaptation, and be close to soluble bridge plug keep away from on the second bellying the side of first bellying is the inclined plane, the inclined plane certainly the axis body to first bellying slope.

The soluble bridge plug comprises: the mandrel is detachably assembled at one end of the soluble locking device; a step part is arranged on the mandrel, and a sealing rubber sheet, a cone sleeve, a slip, a hydraulic piston and an end cover are sequentially assembled on the mandrel from one end close to the step part to the far end; wherein, the sealing rubber is sleeved on the mandrel; the cone sleeve is fixedly assembled on the mandrel through a pin and is abutted against one end of the sealing rubber, the slip is sleeved on the mandrel and the cone sleeve, one end of the hydraulic piston is movably assembled in a hydraulic cavity of the mandrel, the other end of the hydraulic piston is arranged towards the slip, and a hydraulic hole is formed in the mandrel corresponding to the hydraulic cavity; when the soluble bridge plug is located when the preset setting is short, under the action of continuously increased pressure in the oil pipe, the hydraulic piston is driven to move towards the slip and push the slip, the slip acts on the cone sleeve, and the pin is broken to push the cone sleeve, the cone sleeve pushes the sealing rubber to move towards the step part, and expands outwards under the action of the step part to generate sealing with the inner wall of the oil pipe, under the blocking of the sealing rubber, the slip is relative to the cone part to slide and is anchored on the inner wall of the oil pipe.

The soluble bridge plug further comprises: one end of the first shaft sleeve is connected to one end, close to the hydraulic hole, of the mandrel, and the other end of the first shaft sleeve is connected to the end cover; one end of the second shaft sleeve is connected to the first shaft sleeve, and the other end of the second shaft sleeve and the mandrel form a hydraulic cavity for assembling the hydraulic piston.

And sealing parts are arranged between the hydraulic piston and the mandrel as well as between the hydraulic piston and the second shaft sleeve.

The soluble bridge plug is in threaded connection with the soluble locking device.

The end cover is in threaded connection with the mandrel.

After the technical scheme is adopted, the invention has the beneficial effects that: the soluble locking device is arranged on the soluble bridge plug, the soluble locking device and the soluble locking device reach the preset sitting short section in a pumping mode, the soluble locking device is buckled with a step on the preset sitting short section, so that the soluble bridge plug is positioned on the short section, then the soluble bridge plug is pressed into an oil pipe, under the pushing action of the hydraulic piston, the sealing rubber sheet expands outwards and abuts against the wall of the oil pipe to realize sealing, and the slip slides relative to the cone sleeve and is anchored on the wall of the oil pipe, so that the bridge plug is seated. The process does not need steel wire operation, and has the advantages of eliminating hidden troubles of the steel wire operation, saving operation time, reducing operation cost and having wide application range.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

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

FIG. 2 is a schematic view of the structure of the invention assembled in a preset seat short circuit;

fig. 3 is a schematic view of the present invention assembled in an oil pipe.

Description of reference numerals: 1. a soluble bridge plug; 2. a soluble locking device; 3. a step; 4. a groove; 5. a shaft body; 6. an elastic fastening portion; 7. a first boss portion; 8. a second boss portion; 9. a mandrel; 10. a step portion; 11. sealing rubber sheets; 12. a cone sleeve; 13. slips; 14. a hydraulic piston; 15. an end cap; 16. a first bushing; 17. a second shaft sleeve; 18. a hydraulic bore; 19. a pin; 20. a Christmas tree; 21. a safety valve; 22. a sliding sleeve; 23. an oil pipe; 24. a packer; 25. a sleeve; 26. pumping the soluble plug; 27. and presetting a seat short section.

Detailed Description

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

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment as necessary without making a contribution thereto after reading the present specification, but all are protected by patent laws within the scope of the claims of the present invention.

The present embodiment relates to a pumping soluble plug, as shown in fig. 1, including: a soluble bridge plug 1 and a soluble locking device 2. The soluble locking device 2 is assembled on the soluble bridge plug 1, and carries the soluble bridge plug 1 to and locks at the preset landing nipple 27 under the action of pressing or self gravity. The soluble bridge plug 1 is located at a preset locating nipple 27 in the oil pipe 23 under the action of hydraulic pressure in the oil pipe 23. The process does not need steel wire operation, thereby eliminating the hidden trouble of steel wire operation, saving the operation time, reducing the operation cost and enlarging the application range.

The preset seat nipple 27 is provided with 1 step 3, and grooves 4 are formed in two sides of each step 3. The soluble locking device 2 comprises: a shaft body 5 and an elastic fastening part 6. The axis body 5 threaded connection is in 1 one end of soluble bridge plug, and elasticity straining portion 6 is provided with a plurality ofly, and a plurality of elasticity straining portions 6 set up along 5 outside circumference equidistance of axis body, and it is used for with step 3 looks lock, in order to fix soluble bridge plug 1 in predetermineeing the seat node. Due to the elasticity of the elastic fastening part 6, the elastic fastening part 6 can pass through the inside diameter reduction of the completion string under the pressing action. Such as the relief valve 21, the sliding sleeve 22 and other landing nipples, etc., to the preset landing nipple 27.

Further, the elastic fastening portion 6 includes: a first boss 7 and a second boss 8. Two of first bellying 7 and second bellying 8 are along axial interval setting, interval and step looks adaptation between first bellying 7 and the second bellying 8, and the side of keeping away from first bellying 7 on the second bellying 8 that is close to soluble bridging plug is the inclined plane, and the inclined plane inclines to first bellying 7 from the axis body to make first bellying 7 slide step 3.

Further, soluble bridge plug 1 comprises: mandrel 9, step 3, sealing rubber 11, cone sleeve 12, slips 13, hydraulic piston 14, end cover 15, first shaft sleeve 16 and second shaft sleeve 17.

The spindle 9 is screwed to one end of the shaft body 5. The step 3, the sealing rubber 11, the cone sleeve 12, the slips 13, the hydraulic piston 14 and the end cover 15 are sequentially assembled on the mandrel 9 from one end close to the soluble locking device 2 to the other end. Wherein, cone sleeve 12 is fixed on mandrel 9 through pin 19, slips 13 one end and the cone portion overlap joint on the cone sleeve 12, correspond hydraulic piston 14 on the mandrel 9 and be provided with hydraulic pressure hole 18. One end of the first shaft sleeve 16 is connected to one end of the mandrel 9 close to the hydraulic hole 18, and the other end of the first shaft sleeve is connected to the end cover 15; one end of the second sleeve 17 is connected to the first sleeve 16 and the other end forms a hydraulic chamber for the spindle 9 to fit into. One end of the hydraulic piston 14 is movably assembled in the hydraulic cavity, and the other end is in contact connection with the slips 13. Seals are provided between the hydraulic piston 14 and both the spindle 9 and the second sleeve 17 to prevent pressure relief.

When the slip is located at the preset landing nipple 27, a user presses the oil pipe 23, pressure enters the bridge plug, the hydraulic piston 14 is driven to move towards the slip 13 through the hydraulic hole 18, the slip 13 is pushed, the slip 13 acts on the cone sleeve 12, the cone sleeve 12 is pushed after the pin 19 is broken, the cone sleeve 12 pushes the sealing rubber sheet 11 to move towards the step 3 portion, the sealing rubber sheet expands outwards under the blocking of the step 3 portion until the sealing rubber sheet is sealed with the inner wall of the oil pipe 23, the slip 13 slides relative to the cone portion under the blocking of the sealing rubber sheet 11 and is anchored on the inner wall of the oil pipe 23, and landing is achieved.

It should be noted that the pumping plug is made of a soluble material, wherein the sealing rubber sheet 11 is a soluble rubber, the rest components are made of an aluminum magnesium alloy, and since the temperature in the oil pipe 23 is suitable and the completion fluid in the oil pipe contains potassium chloride, the aluminum magnesium alloy is gradually dissolved in the completion fluid in a suitable temperature environment.

The working principle of the invention is roughly as follows: in the process of setting the pumping plug, firstly, the soluble locking device 2 carries the soluble bridge plug 1 to reach and lock the soluble bridge plug at the preset setting short section 27 under the pressing condition, then a user presses the soluble bridge plug continuously in the oil pipe 23, most of pressure enters the bridge plug, the hydraulic piston 14 is driven to move towards the slip 13 through the hydraulic hole 18 and pushes the slip 13, the slip 13 acts on the cone sleeve 12, the cone sleeve 12 is pushed after the pin 19 is broken, the cone sleeve 12 pushes the sealing rubber 11 to move towards the step 3, the sealing rubber expands outwards under the blocking of the step 3 until the sealing rubber is sealed with the inner wall of the oil pipe 23, the slip 13 slides relative to the cone part under the blocking of the sealing rubber 11 and is anchored on the inner wall of the oil pipe 23, and the setting is realized. And then, continuously pressing to enable the packer 24 to touch and set, testing the packer 24, removing the blowout preventer during well completion after the seal is tested to be qualified, installing a production wellhead and a Christmas tree 20, and putting into production after the pumping soluble plug 26 is completely dissolved.

The above description is only for the purpose of illustrating the technical solutions of the present invention and not for the purpose of limiting the same, and other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention should be covered by the claims of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A pumping soluble plug, comprising:

the soluble bridge plug (1) is used for being located at a preset locating short section (27) in the oil pipe (23) under the action of hydraulic pressure in the oil pipe (23); and the number of the first and second groups,

the soluble locking device (2) is assembled on the soluble bridge plug (1), is positioned at the upper end of the soluble bridge plug when in use, and is used for carrying the soluble bridge plug (1) to and locking at a preset landing short section (27) under the action of pressing or self gravity.

2. The pumping soluble plug according to claim 1, characterized in that said soluble locking means (2) comprise:

a shaft body (5) assembled at one end of the soluble bridge plug (1); and the number of the first and second groups,

the elastic fastening parts (6) are arranged on the outer side of the shaft body (5) and used for being buckled with the steps (3) on the preset seat short section (27).

3. The soluble plug for pumping according to claim 2, characterized in that said elastic fastening portion (6) comprises two first (7) and second (8) axially spaced projections, the spacing between said first (7) and second (8) projections being adapted to said step (3), and the side of said second projection (8) close to said soluble bridge plug (1) remote from said first projection (7) being an inclined surface which is inclined from said shaft body (5) to said first projection (7).

4. A pumping soluble plug according to any one of claims 1 to 3, characterized in that said soluble bridge plug (1) comprises: a mandrel (9) detachably assembled at one end of the soluble locking device (2);

the stepped part (3), the sealing rubber (11), the cone sleeve (12), the slips (13), the hydraulic piston (14) and the end cover (15) are sequentially assembled on the mandrel (9) from one end close to the soluble locking device (2) to the far end;

the cone sleeve (12) is fixedly assembled on the mandrel (9) through a pin (19), one end of the slip (13) is overlapped with a cone part on the cone sleeve (12), and a hydraulic hole (18) is formed in the mandrel (9) corresponding to the hydraulic piston (14);

when soluble bridging plug (1) is located when presetting landing nipple joint (27), under the effect of the pressure in oil pipe (23), order to hydraulic piston (14) to slips (13) motion, and promote slips (13), slips (13) act on cone sleeve (12), extremely promote after pin (19) break cone sleeve (12), cone sleeve (12) promote sealed rubber (11) to step portion (3) direction removes, and outwards expand under the effect of step portion (3) to with oil pipe (23) inner wall produces sealedly under the blocking of sealed rubber (11), slips (13) are relative the cone portion slides to the anchor connect in oil pipe (23) inner wall.

5. The pumping soluble plug according to claim 4, characterized in that said soluble bridge plug (1) further comprises: a first shaft sleeve (16) and a second shaft sleeve (17), wherein one end of the first shaft sleeve (16) is connected to one end, close to the hydraulic hole (18), of the mandrel (9), and the other end of the first shaft sleeve is connected to the end cover (15); one end of the second shaft sleeve (17) is connected to the first shaft sleeve (16), and the other end of the second shaft sleeve and the mandrel (9) form a hydraulic cavity for assembling the hydraulic piston (14).

6. Pumping soluble plug according to claim 5, characterized in that between said hydraulic piston (14) and said mandrel (9) and said second sleeve (17) there are provided seals.

7. The soluble plug for pumping according to claim 1, characterized in that said soluble bridge plug (1) is screwed with said soluble locking means (2).

8. Pumping soluble plug according to claim 4, characterized in that said end cap (15) and said mandrel (9) are screwed.